JP2009281345A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a compression spring (31) in an intake check valve (16) from being nipped in a fixed scroll (21) or a movable scroll (22). <P>SOLUTION: The fixed scroll (21) is provided with an intake passage (29) formed opening to take a fluid into a compression chamber (24). A pipe member (19) is connected to an open end of the intake passage (29) of the fixed scroll (21) by being fitted thereinto. The intake passage (29) is provided with the intake check valve (16) to open/close the pipe member (19), wherein the other end of the compression spring (31) in the intake check valve (16) is fixed to the fixed scroll (21) by a fixing means (33). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

    The present invention relates to a scroll compressor provided with a suction check valve.

    2. Description of the Related Art Conventionally, a scroll compressor including a suction check valve for preventing a fluid in a compression chamber from flowing back to the suction pipe side is known (see, for example, Patent Document 1). This type of scroll compressor includes a casing, a drive motor disposed in the casing, and a compression mechanism coupled to the drive motor in the casing. The compression mechanism has a fixed scroll and a movable scroll each having a spiral wrap. The fixed scroll and the movable scroll are arranged so that the respective wraps mesh with each other, and a compression chamber is formed between the wraps.

    The compression mechanism is formed with a suction passage for sucking fluid into the compression chamber and a discharge passage for discharging the fluid compressed in the compression chamber. The suction check valve is provided in the suction passage to prevent the fluid from flowing back from the inside of the compression mechanism to the outside of the compression mechanism through the suction passage.

    FIG. 17 is an enlarged sectional view showing the vicinity of a conventional suction passage. As shown in FIG. 17, the suction passage (101) is formed to open in the fixed scroll (102) so as to extend in the thickness direction of the fixed scroll (102) (vertical direction in the figure). A suction hole (103) is formed on the side of the suction passage (101), and the suction passage (101) communicates with the compression chamber (104) through the suction hole (103).

    A suction pipe (105) is connected to the fixed scroll (102) so as to communicate with the suction passage (101). A suction check valve (106) is disposed in the suction passage (101). The suction check valve (106) includes a valve body (107) that opens and closes the end of the suction pipe (105) on one end side of the suction passage (101), the valve body (107), and the suction passage (101). It is comprised by the spring (108) inserted between the end side wall surfaces. Both ends of the spring (108) are not connected and fixed to any member of the valve body (107) and the fixed scroll (102).

Thus, when the fluid is inhaled, the valve body (107) moves against the biasing force of the spring (108) by the fluid flowing from the suction pipe (105), and the suction body is opened. Fluid is drawn into the compression chamber (104) from the pipe (105) through the suction passage (101). On the other hand, when the fluid is not sucked, the end of the suction pipe (105) is closed by the valve body (107) biased by the spring (108), so that the suction pipe (105) from the compression chamber (104) side is closed. The reverse flow of the fluid to the side is prevented, and the reverse rotation of the movable scroll (not shown) is suppressed.
Japanese Patent Laid-Open No. 11-22663

    However, in the conventional scroll compressor, as shown in FIG. 18 which is an enlarged sectional view of the vicinity of the conventional suction passage, when a large amount of fluid such as lubricating oil or liquid refrigerant is sucked from the suction passage (101), At the same time, there is a problem that the spring (108) of the suction check valve (106) is sucked into the compression chamber (104) and is caught in the fixed scroll (102) and the movable scroll (not shown).

    The present invention has been made in view of such a point, and an object of the present invention is to urge the valve body of the suction check valve even when a large amount of liquid such as lubricating oil flows into the suction passage. The object is to prevent the compression spring from being caught in the fixed scroll and the movable scroll.

    In order to achieve the above object, a first invention forms a compression chamber for compressing fluid between the movable scroll and the movable scroll, and a suction passage for sucking the fluid into the compression chamber. A fixed scroll formed by opening an opening, a pipe member fitted and connected to an opening end of the suction passage in the fixed scroll, and a suction check valve provided in the suction passage and opening and closing the pipe member Is intended for scroll compressors. The suction check valve has a compression spring and a valve body placed on one end of the compression spring, and the other end of the compression spring is fixed to the fixed scroll by a fixing means.

    In the first aspect of the invention, when no fluid is supplied to the pipe member connected by being connected to the suction passage, the pipe member is closed by the valve body of the suction check valve biased by the compression spring. That is, the pipe member is closed by the suction check valve. On the other hand, when the fluid is supplied to the pipe member, the valve body separates from the pipe member against the urging force of the compression spring due to the pressure of the fluid. As a result, the pipe member is opened by the suction check valve, and the fluid is sucked into the compression chamber through the suction passage.

    In the present invention, since the other end of the compression spring is fixed to the fixed scroll by the fixing means, for example, even when the fluid in the liquid state is sucked, the other end of the compression spring is displaced. Is suppressed. As a result, the compression spring is prevented from biting into the fixed scroll and the movable scroll.

    In a second aspect based on the first aspect, the fixing means is a spring seat fixed to the fixed scroll and supporting the other end of the compression spring.

    In the second invention, since the spring seat is fixed to the fixed scroll, the other end of the compression spring is fixed to the fixed scroll via the spring seat.

    In a third aspect based on the second aspect, the spring seat is press-fitted into the fixed scroll in the suction passage.

    In the third invention, since the spring seat is press-fitted and fixed to the fixed scroll in the suction passage, the other end of the compression spring is suitably fixed to the fixed scroll in the fixed spring seat.

    In a fourth aspect based on the second aspect, the spring seat is screwed to the fixed scroll in the suction passage.

    In the fourth invention, since the spring seat is fixed to the fixed scroll by screwing in the suction passage, the other end of the compression spring is suitably fixed to the fixed scroll in the fixed spring seat.

    In a fifth aspect based on the first aspect, the fixing means is a welding pin embedded in the fixed scroll and welded at the other end of the compression spring.

    In the fifth invention, since the other end of the compression spring is welded and fixed to the welding pin embedded in the fixed scroll, the compression spring is reliably prevented from being caught in the fixed scroll and the movable scroll. .

    In a sixth aspect based on the first aspect, the fixing means is a bolt that fastens and fixes the other end of the compression spring to the fixed scroll.

    In the sixth aspect of the invention, the other end of the compression spring is fastened and fixed to the fixed scroll by the bolt, so that the compression spring is reliably prevented from being caught in the fixed scroll and the movable scroll.

    In a seventh aspect based on the first aspect, the fixing means is an adhesive member for adhesively fixing the other end of the compression spring to the fixed scroll.

    In the seventh invention, the other end of the compression spring is easily and reliably fixed to the fixed scroll by the adhesive member while reducing the number of parts.

    In an eighth aspect based on the first aspect, the fixing means is a welded portion for welding and fixing the other end of the compression spring to the fixed scroll.

    In the eighth invention, the other end of the compression spring is firmly and reliably fixed to the fixed scroll by the welded portion while reducing the number of parts.

    According to a ninth aspect of the present invention, there is provided a fixed scroll in which a compression chamber for compressing fluid is formed between the movable scroll and the movable scroll, and a suction passage for sucking the fluid is opened in the compression chamber. A scroll compressor comprising: a pipe member fitted and connected to an opening end of the suction passage in the fixed scroll; and a suction check valve provided in the suction passage to open and close the pipe member It is said. The suction check valve includes a compression spring and a valve body mounted on one end of the compression spring, and includes a locking means for locking the other end of the compression spring to the fixed scroll. Yes.

    In the ninth invention, since the other end of the compression spring is locked to the fixed scroll by the locking means, for example, the position of the other end of the compression spring can be obtained even when an abnormal fluid is sucked. Deviation is suppressed. As a result, the compression spring is prevented from biting into the fixed scroll and the movable scroll.

    According to a tenth aspect, in the ninth aspect, the locking means includes a pin formed on the spring seat so as to protrude on a side opposite to the compression spring, and the fixed scroll so that the pin is inserted. And a pin hole formed on the surface.

    In the tenth invention, since the pin of the spring seat that constitutes the locking means is inserted into the pin hole of the fixed scroll, the pin contacts the inner peripheral surface of the pin hole before the spring seat is displaced. Thus, the movement of the spring seat is suppressed. This prevents the compression spring from being bitten.

    According to the first aspect of the present invention, the other end of the compression spring provided with a valve body at one end is fixed to the fixed scroll by the fixing means. Moreover, the position shift of the other end of the compression spring can be suppressed. As a result, the compression spring is not sucked together with the fluid, and the compression spring can be prevented from biting into the fixed scroll and the movable scroll.

    According to the second aspect, the other end of the compression spring can be fixed to the fixed scroll via the spring seat.

    According to the third aspect, the spring seat can be press-fitted and fixed to the fixed scroll of the suction passage. According to the fourth aspect of the invention, the spring seat can be screwed and fixed to the fixed scroll of the suction passage.

    According to the fifth aspect, the other end of the compression spring can be securely fixed to the welding pin embedded in the fixed scroll. According to the sixth aspect, the other end of the compression spring can be securely fastened and fixed to the fixed scroll by the bolt.

    According to the seventh aspect, the other end of the compression spring can be easily and reliably fixed to the fixed scroll by the adhesive member while reducing the number of parts. Further, according to the eighth aspect, the other end of the compression spring can be firmly and reliably fixed to the fixed scroll by the welded portion while reducing the number of parts.

    According to the ninth aspect of the invention, the other end of the compression spring provided with a valve body at one end is locked to the fixed scroll by the locking means. The compression spring can be prevented from biting into the fixed scroll and the movable scroll.

    According to the tenth aspect, by inserting the pin of the spring seat into the pin hole of the fixed scroll, the movement of the spring seat can be suppressed and the compression spring can be prevented from being bitten.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1 of the Invention
1 and 2 show Embodiment 1 of the present invention.

    FIG. 1 is a longitudinal sectional view showing the structure of the scroll compressor (10) of the first embodiment. FIG. 2 is an enlarged sectional view schematically showing the vicinity of the suction passage (29) in the first embodiment.

    The scroll compressor (10) of Embodiment 1 is provided in a refrigerant circuit that performs a vapor compression refrigeration cycle of an air conditioner, for example, and compresses a refrigerant as a fluid. As shown in FIG. 1, the scroll compressor (10) includes a compression mechanism (20) housed in a sealed container-like casing, and a pipe member that penetrates the casing and is connected to the compression mechanism (20). And a suction pipe joint (19).

    The casing includes a vertically long cylindrical body (11) and a bowl-shaped lid (14), and the lid (14) is fixed so as to close both end openings of the body (11). A closed container is constructed. Moreover, a through hole is provided in the outer peripheral surface of the upper lid (14), and a suction pipe joint (19) is inserted and fixed in the through hole.

    The suction pipe joint (19) connects the suction pipe (15) and the compression mechanism (20) and introduces the suction gas flowing through the suction pipe (15) into the compression mechanism (20).

    Housed in the casing are a compression mechanism (20) for compressing the refrigerant and an electric motor (45) for driving the compression mechanism (20). The electric motor (45) is disposed below the compression mechanism (20), and is connected to the compression mechanism (20) via a drive shaft (40) that is a rotating shaft.

    The electric motor (45) includes a stator (46) and a rotor (47). The stator (46) is fixed to the body (11) of the casing. The rotor (47) is connected to the drive shaft (40) and rotationally drives the drive shaft (40).

    The drive shaft (40) includes a main shaft portion (41) and an eccentric portion (42), and constitutes a crank. The eccentric portion (42) is formed with a smaller diameter than the main shaft portion (41), and is erected on the upper end surface of the main shaft portion (41). The eccentric portion (42) is eccentric by a predetermined distance with respect to the axial center of the main shaft portion (41) to constitute an eccentric pin.

    A lower bearing member (48) is fixed near the lower end of the casing (11) of the casing. The lower bearing member (48) rotatably supports the lower end portion of the drive shaft (40). Although not illustrated, an oil supply passage extending in the vertical direction is formed inside the drive shaft (40), and an oil supply pump is provided at the lower end of the drive shaft (40). The refrigerating machine oil sucked up from the bottom of the casing by the oil pump is supplied to the sliding portions of the compression mechanism (20) through the oil supply passage of the drive shaft (40).

    The compression mechanism (20) includes a movable scroll (22), a fixed scroll (21), and a housing (23). A compression chamber (24) for compressing the refrigerant is formed between the movable scroll (22) and the fixed scroll (21).

    The movable scroll (22) includes a movable side end plate portion (22a), a movable side wrap (22b), and a boss portion (22c). The movable side end plate portion (22a) of the movable scroll (22) is formed in a substantially disc shape. The movable side wrap (22b) is erected on the upper surface of the movable side end plate part (22a) and is integrally formed with the movable side end plate part (22a). The movable wrap (22b) is formed in a spiral wall shape having a constant height. The boss portion (22c) extends downward from the lower surface of the movable side end plate portion (22a) and is integrally formed with the movable side end plate portion (22a). The eccentric portion (42) of the drive shaft (40) is inserted into the boss portion (22c). That is, when the drive shaft (40) rotates, the movable scroll (22) revolves around the axis of the drive shaft (40). The revolution radius of the movable scroll (22) is the same as the eccentric amount of the eccentric part (42), that is, the distance between the axis of the drive shaft (40) and the axis of the eccentric part (42).

    The fixed scroll (21) includes a fixed side end plate portion (21a), a fixed side wrap (21b), an edge portion (21c), and a suction passage (29). The fixed side end plate portion (21a) of the fixed scroll (21) is formed in a substantially disc shape. The fixed side wrap (21b) is erected on the lower surface of the fixed side end plate part (21a), and is integrally formed with the fixed side end plate part (21a). The fixed side wrap (21b) is formed in a spiral wall shape having a constant height, and is configured to mesh with the movable side wrap (22b) of the movable scroll (22). The compression chamber (24) is defined by the meshing of the fixed wrap (21b) and the movable wrap (22b). The edge portion (21c) is formed in a wall shape extending downward from the outer peripheral edge portion of the fixed side end plate portion (21a). The lower end portion of the edge portion (21c) projects outward over the entire circumference, and is fixed to the upper surface of the upper step portion (23a) of the housing (23).

    The suction passage (29) is for sucking the refrigerant into the compression chamber (24), and in the edge (21c) of the fixed scroll (21) the axial direction of the drive shaft (40) (up and down in FIG. 1). Direction). That is, the fixed scroll (21) has a bottom surface (17) which is a closed end at the lower end of the suction passage (29), and a suction opening (13) which is an open end at the upper end of the suction passage (29). Is formed. The lower end of the suction pipe joint (19) is fitted and connected to the suction opening (13). Further, the suction pipe (15) is fitted and connected to the upper end of the suction pipe joint (19).

    The fixed scroll (21) is formed with a suction hole (12) that opens to the outermost peripheral end of the compression chamber (24) and communicates with the lower side portion of the suction passage (29). That is, the suction passage (29) communicates the suction opening (13) and the suction hole (12). The suction passage (29) is provided with a later-described suction check valve (16) for opening and closing the suction pipe joint (19). With this configuration, the suction gas flowing through the suction pipe (15) can be introduced into the compression chamber (24) through the suction pipe joint (19), the suction passage (29), and the suction hole (12).

    The entire circumference of the housing (23) is joined to the inner surface of the body (11) of the casing. The housing (23) is composed of an upper step (23a) and a lower step (23b). The upper step portion (23a) and the lower step portion (23b) are successively formed from top to bottom. The upper step (23a) has a recess formed in the center of the upper surface thereof. The lower step (23b) is formed in a substantially cylindrical shape having a smaller diameter than the upper step (23a), and protrudes downward from the lower surface of the upper step (23a). The lower step portion (23b) constitutes a main bearing through which the main shaft portion (41) of the drive shaft (40) is inserted and rotatably supports the main shaft portion (41).

    The movable side end plate portion (22a) of the movable scroll (22) is positioned above the upper step portion (23a), and the boss portion (22c) is positioned in the concave portion of the upper step portion (23a). Although not shown, Oldham prevents the movable scroll (22) from rotating between the movable end plate (22a) of the movable scroll (22) and the upper surface (23a) of the housing (23). A joint is provided.

    Moreover, as shown in FIG. 1, the discharge pipe (18) is penetrated and connected to the trunk | drum (11). The discharge pipe (18) communicates with the high-pressure space below the housing (23) in the casing.

    As shown in the enlarged view in FIG. 2, the suction check valve (16) includes a compression spring (31) and a valve body (32) placed on the upper end, which is one end of the compression spring (31). Have. Furthermore, the lower end which is the other end of the compression spring (31) is fixed to the fixed scroll (21) by the fixing means (33).

    The fixing means (33) is a spring seat (34) fixed to the fixed scroll (21) and supporting the lower end of the compression spring (31). The spring seat (34) is fixed by being press-fitted into the fixed scroll (21) at the bottom surface (17) of the suction passage (29).

    The valve body (32) is formed in a dish shape with a concave bottom surface, and is biased by contacting the upper end of the compression spring (31) with the concave bottom surface. On the other hand, the spring seat (34) is formed in a dish shape whose upper surface is recessed in a concave shape, and the lower end of the compression spring (31) is fixedly supported by the concave upper surface. Thus, the compression spring (31) has its upper end urged to the concave lower surface of the valve body (32) by its extension force, while its lower end is fixed to the concave upper surface of the spring seat (34). Yes.

-Operation of scroll compressor-
Next, the operation of the scroll compressor (10) described above will be described.

    First, when the electric motor (45) is driven, the drive shaft (40) rotates and the movable scroll (22) performs a revolving motion with respect to the fixed scroll (21). At that time, the movable scroll (22) is prevented from rotating by the Oldham coupling.

    Along with the revolving motion of the movable scroll (22), the volume of the compression chamber (24) periodically increases and decreases. When the volume of the compression chamber (24) increases, the refrigerant (suction gas) flowing through the refrigerant circuit passes through the suction pipe joint (19) from the suction pipe (15) and is a suction check valve in the suction passage (29). Contact the valve body (32) of (16). Here, when the pressure of the suction gas becomes larger than the extension force of the compression spring (31), the compression spring (31) contracts and the valve body (32) is detached from the lower end of the suction pipe joint (19). The suction passage (29) is opened. As a result, the suction pipe joint (19) and the suction hole (12) are in communication with each other via the suction passage (29). Then, the suction gas is sucked into the compression chamber (24) through the suction passage (29). When the volume of the compression chamber (24) decreases, the refrigerant is compressed and discharged to the discharge passage (26).

    On the other hand, when the electric motor (45) stops, the pressure of the suction gas applied to the valve body (32) becomes smaller than the extension force of the compression spring (31). ) Is biased upward, and the valve body (32) is pressed against the lower end of the suction pipe joint (19), thereby closing the suction passage (29). Thus, the compression spring (31) returns to the state before contraction shown in FIG. 2, and the suction passage (29) is closed. Then, the flow of the suction gas to the compression chamber (24) is interrupted.

-Effect of Embodiment 1-
Therefore, according to the first embodiment, since the spring seat (34) press-fitted and fixed to the fixed scroll (21) in the suction passage (29) is used as the fixing means (33), the fixed spring seat (34) Thus, the lower end of the compression spring (31) can be fixed to the fixed scroll (21). That is, in the first embodiment, the spring seat (34) can be pressed into the suction passage (29) and fixed to the fixed scroll (21), and the concave shape of the fixed spring seat (34) can be fixed. The lower end of the compression spring (31) can be fixed by the upper surface. That is, the lower end of the compression spring (31) can be fixed to the fixed scroll (21) via the spring seat (34).

    Therefore, for example, even when a large amount of lubricating oil or liquid refrigerant is sucked, the lower end of the compression spring (31) is displaced by the spring seat (34) press-fitted and fixed to the fixed scroll (21). And the biting of the compression spring (31) into the fixed scroll (21) and the movable scroll (22) can be prevented.

<< Embodiment 2 of the Invention >>
3 and 4 show Embodiment 2 of the present invention.

    FIG. 3 is an enlarged sectional view schematically showing the vicinity of the suction passage (29) in the second embodiment. 4 is a cross-sectional view schematically showing a cross section taken along line IV-IV in FIG. In the following embodiments, the same portions as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

    In the first embodiment, the spring seat (34) is press-fitted and fixed to the fixed scroll (21). In the second embodiment, as shown in FIG. 3, the spring seat (34) is placed in the suction passage (29). The fixed scroll (21) is screwed. That is, the fixing means (33) of the second embodiment is a spring seat (34) fixed to the fixed scroll (21) with screws.

    On the inner peripheral surface near the bottom surface (17) of the suction passage (29), a thread groove is formed, while on the outer peripheral surface of the spring seat (34), a thread is formed. Further, as shown in FIG. 4, the suction passage (29) and the suction hole (12) are each formed into a passage having a circular cross section, and are formed in a bowl shape by communicating with each other in the lower part thereof. Then, the spring seat (34) is screwed into the lower portion of the suction passage (29), and the bottom surface of the spring seat (34) is brought into contact with the bottom surface (17) of the suction passage (29). As a result, the spring seat (34) is fixed to the fixed scroll (21).

-Effect of Embodiment 2-
Therefore, according to the second embodiment, the lower end of the compression spring (31) can be fixed to the fixed scroll (21) by the spring seat (34) screwed to the fixed scroll (21). 1 can be obtained. In addition, since the spring seat (34) is fixed by screwing, the spring seat (34) can be detachable while being fixed to the fixed scroll (21).

<< Embodiment 3 of the Invention >>
5 and 6 show Embodiment 3 of the present invention.

    FIG. 5 is an enlarged cross-sectional view schematically showing the vicinity of the suction passage (29) in the third embodiment. FIG. 6 is a cross-sectional view showing a state in which the pin (35) of the spring seat (34) is locked in the pin hole (36) of the fixed scroll (21).

    In the third embodiment, a locking means (35, 36) is provided instead of the fixing means for the fixed scroll (21), and the other end of the compression spring (31) is locked to the fixed scroll (21). It is what I did.

    The locking means (35, 36) is fixed so that the pin (35) formed on the spring seat (34) and the pin (35) are inserted so as to protrude on the opposite side of the compression spring (31). It is comprised by the pin hole (36) formed in the scroll (21).

    A slight gap may be formed between the inner peripheral surface of the pin hole (36) and the outer peripheral surface of the pin (35). By providing such a gap, the pin (35) of the spring seat (34) can be easily inserted into the pin hole (36), so that the spring seat (34) can be easily mounted on the fixed scroll (21). .

-Effect of Embodiment 3-
As shown in FIG. 6, when a large amount of lubricating oil, liquid refrigerant, or the like is sucked, for example, the spring seat (34) is inclined by the fluid pressure and the bottom surface of the suction passage (29) in the fixed scroll (21) ( 17) Try to leave. However, at this time, the pin (35) of the spring seat (34) is brought into contact with the inner peripheral surface of the pin hole (36) as shown by points A and B in FIG. Locked to the fixed scroll (21). That is, the lower end of the compression spring (31) is locked to the fixed scroll (21) through the pin (35) and the pin hole (36) with the spring seat (34) biased downward. Become.

    Therefore, according to the third embodiment, the pin (35) is brought into contact with the inner peripheral surface of the pin hole (36) before the spring seat (34) is displaced, thereby suppressing the movement of the spring seat (34). be able to. Then, the lower end of the compression spring (31) is locked to the pin hole (36) of the fixed scroll (21) by the pin (35) of the spring seat (34), and the fixed scroll (21) of the compression spring (31) ) And the movable scroll (22) can be prevented from being caught, and the same effect as in the first embodiment can be obtained. In addition, since the spring seat (34) is not press-fitted into the suction passage (29) as in the first embodiment, the suction passage (29) is fixed while the spring seat (34) is fixed to the fixed scroll (21). Regardless of the size and shape of 29), the outer shape of the spring seat (34) can be defined.

<< Embodiment 4 of the Invention >>
7 to 9 show Embodiment 4 of the present invention.

    7 to 9 are cross-sectional views schematically showing an enlarged main part of the suction check valve (16) in the fourth embodiment.

    In the first and second embodiments, the example in which the spring seat (34) as the fixing means (33) is fixed to the fixed scroll (21) has been described. However, the fourth embodiment is a spring seat in the first and second embodiments. A communication part (39) is provided for (34).

    The spring seat (34) and the valve body (32) are formed by the concave upper surface of the spring seat (34) and the concave lower surface of the valve body (32) in a state where the compression spring (31) contracts and abuts each other. An internal space (27) is formed.

    The spring seat (34) is formed with a communication portion (39) that communicates the internal space (27) with the outside. For example, as shown in FIG. 7, the communication portion (39) may be a through hole (37) penetrating the bottom of the spring seat (34) in the thickness direction. As shown in FIG. It may be a through hole (37) penetrating the side wall of 34) in the thickness direction. Moreover, as shown in FIG. 9, you may comprise a communicating part (39) by the notch part (38) formed in the upper end of the side wall part of a spring seat (34). The communication part (39) can also be constituted by a through hole or a notch formed in the side wall part of the valve body (32) in the same manner.

-Effect of Embodiment 4-
Here, the elastic force of the compression spring (31) is set to be relatively large so that such an internal space (27) is not formed at normal times, but abnormalities such as when a liquid fluid such as lubricating oil is inhaled, etc. In some cases, the compression spring (31) is greatly contracted, and the spring seat (34) and the valve body (32) come into contact with each other to form the internal space (27).

    If the communication part (39) is not provided, the pressure (P1) in the internal space (27) is higher than the pressure (P0) on the suction pipe joint (19) side, as shown in FIG. In addition, the pressure is lower than the pressure (P2) on the compression chamber (24) side, and the relationship between the pressures is P2> P1> P0.

    At this time, the valve body (32) and the spring seat (34) are difficult to open because the pressure (P1) in the internal space (27) is lower than the surrounding pressure (P2). As a result, it takes time for the suction check valve (16) to be closed, and there is a possibility that refrigerant, lubricating oil, etc. will flow backward, or the movable scroll (22) will rotate backward.

    On the other hand, according to the fourth embodiment, the through hole (37) or the notch (38) as the communication portion (39) is formed in the spring seat (34), as shown in FIG. Even when an abnormal pressure is applied to the compression spring (31), the internal space (27) formed by the spring seat (34) and the valve body (32) and the outside thereof are connected to the through hole ( 37) or the notch (38). Therefore, the pressure of the internal space (27) can be set to the same pressure (P2) as the outside, and the suction check valve (16) can be quickly closed, and the refrigerant, lubricating oil, etc. It becomes possible to prevent reverse rotation of the scroll (22).

(Modification of Embodiment 4)
FIG. 12 is a cross-sectional view illustrating a modification of the fourth embodiment.

    In the modification of the fourth embodiment, the communication portion (39) is provided to the spring seat (34) in the third embodiment. That is, on the bottom surface of the spring seat (34), a pin (35) inserted into the pin hole (36) of the fixed scroll (21) and locked is formed to protrude. The spring seat (34) is formed with a notch (38) as a communication part (39).

    Even in this case, since the internal space (27) formed by the spring seat (34) and the valve body (32) can be reliably opened, the suction check valve (16) can be quickly closed. In addition, the pin (35) can suppress the movement of the spring seat (34) and prevent the compression spring (31) from being caught in the fixed scroll (21) and the movable scroll (22).

<< Embodiment 5 of the Invention >>
FIG. 13 shows a fifth embodiment of the present invention.

    FIG. 13 is an enlarged sectional view schematically showing the vicinity of the suction passage (29) in the fifth embodiment.

    In the first and second embodiments, the spring seat (34) is provided as the fixing means (33). In the fifth embodiment, the lower end of the compression spring (31) is embedded in the fixed scroll (21). The welding pin (51) welded with was used as the fixing means (33).

    That is, the fixed scroll (21) is fixed with the welding pin (51) embedded in the bottom surface (17) of the suction passage (29). The lower end of the compression spring (31) is welded and fixed to the upper end of the welding pin (51). It is desirable to perform final finishing of the fixed scroll (21) after welding the lower end of the compression spring (31) to the welding pin (51). As a result, even if the fixed scroll (21) is distorted by welding, the product accuracy of the compressor can be maintained high by the final finishing process.

-Effect of Embodiment 5-
Therefore, according to the fifth embodiment, the lower end of the compression spring (31) can be securely fixed to the fixed scroll (21) by the welding pin (51), and the same effect as in the first embodiment can be obtained. .

Embodiment 6 of the Invention
FIG. 14 shows Embodiment 6 of the present invention.

    FIG. 14 is an enlarged cross-sectional view schematically showing the vicinity of the suction passage (29) in the sixth embodiment.

    In the sixth embodiment, the fixing means (33) is the bolt (52) that fastens and fixes the lower end of the compression spring (31) to the fixed scroll (21). That is, the bolt (52) is fastened and fixed to the bottom surface (17) of the suction passage (29) so as to sandwich the lower end of the compression spring (31). Thus, the lower end of the compression spring (31) is fixed to the fixed scroll (21).

-Effect of Embodiment 6-
Therefore, according to the sixth embodiment, since the lower end of the compression spring (31) can be fixed to the fixed scroll (21) by the bolt (52), the same effect as in the first embodiment can be obtained. In addition, the lower end of the compression spring (31) can be detachably and securely fixed to the fixed scroll (21).

<< Embodiment 7 of the Invention >>
FIG. 15 shows Embodiment 7 of the present invention.

    FIG. 15 is an enlarged sectional view schematically showing the vicinity of the suction passage (29) in the seventh embodiment.

    In the seventh embodiment, the adhesive member (53) that adheres and fixes the lower end of the compression spring (31) to the fixed scroll (21) is used as the fixing means (33). That is, the lower end of the compression spring (31) is adhered and fixed to the bottom surface (17) by the adhesive member (53) in a state of being in contact with the bottom surface (17) of the suction passage (29).

-Effect of Embodiment 7-
Therefore, according to the seventh embodiment, since the lower end of the compression spring (31) can be fixed to the fixed scroll (21) by the adhesive member (53), the same effect as in the first embodiment can be obtained. In addition, the lower end of the compression spring (31) can be easily and reliably fixed to the fixed scroll (21) while reducing the number of parts.

<< Embodiment 8 of the Invention >>
FIG. 16 shows an eighth embodiment of the present invention.

    FIG. 16 is an enlarged cross-sectional view schematically showing the vicinity of the suction passage (29) in the eighth embodiment.

    In the eighth embodiment, the fixing means (33) is the welded portion (54) that welds and fixes the lower end of the compression spring (31) to the fixed scroll (21). That is, the lower end of the compression spring (31) is welded and fixed to the bottom surface (17) by, for example, laser welding or spot welding while being in contact with the bottom surface (17) of the suction passage (29). It is desirable to perform final finishing of the fixed scroll (21) after welding the lower end of the compression spring (31) to the fixed scroll (21). As a result, even if the fixed scroll (21) is distorted by welding, the product accuracy of the compressor can be maintained high by the final finishing process.

-Effect of Embodiment 8-
Therefore, according to the eighth embodiment, since the lower end of the compression spring (31) can be fixed to the fixed scroll (21) by the welded portion (54), the same effect as in the first embodiment can be obtained. In addition, the lower end of the compression spring (31) can be easily and reliably fixed to the fixed scroll (21) while reducing the number of parts.

<< Other Embodiments >>
In the above embodiments, specific examples of the fixing means (33) and the locking means (35, 36) have been described. However, the fixing means and the locking means in the present invention are not limited to these, and a compression spring ( Other means for fixing or locking the other end of 31) to the fixed scroll (21) are included.

    In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

    As described above, the present invention is useful for a scroll compressor provided with a suction check valve.

FIG. 1 is a longitudinal sectional view showing the structure of the scroll compressor according to the first embodiment. FIG. 2 is an enlarged sectional view schematically showing the vicinity of the suction passage in the first embodiment. FIG. 3 is an enlarged cross-sectional view schematically showing the vicinity of the suction passage in the second embodiment. 4 is a cross-sectional view schematically showing a cross section taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view schematically showing an enlarged vicinity of the suction passage in the third embodiment. FIG. 6 is a cross-sectional view showing a state in which the pin of the spring seat is locked in the pin hole of the fixed scroll. FIG. 7 is a cross-sectional view schematically showing an enlarged main part of the suction check valve in the fourth embodiment. FIG. 8 is a cross-sectional view schematically showing an enlarged main part of the suction check valve in the fourth embodiment. FIG. 9 is an enlarged cross-sectional view schematically showing a main part of the suction check valve according to the fourth embodiment. FIG. 10 is a sectional view schematically showing an enlarged vicinity of the suction passage together with a spring seat having no communication portion. FIG. 11 is a cross-sectional view schematically showing an enlarged vicinity of the suction passage together with a spring seat having a communication portion. FIG. 12 is an enlarged sectional view schematically showing the vicinity of the suction passage in the modification of the fourth embodiment. FIG. 13 is an enlarged sectional view schematically showing the vicinity of the suction passage in the fifth embodiment. FIG. 14 is a sectional view schematically showing an enlarged vicinity of the suction passage in the sixth embodiment. FIG. 15 is a cross-sectional view schematically showing an enlarged vicinity of the suction passage in the seventh embodiment. FIG. 16 is an enlarged cross-sectional view schematically showing the vicinity of the suction passage in the eighth embodiment. FIG. 17 is an enlarged cross-sectional view showing the vicinity of a suction passage blocked by a conventional suction check valve. FIG. 18 is an enlarged cross-sectional view of the vicinity of a suction passage in which a conventional compression spring is engaged with a fixed scroll and a movable scroll.

Explanation of symbols

10 Scroll compressor
13 Suction opening (open end)
16 Suction check valve
19 Suction pipe fitting (pipe member)
21 Fixed scroll
22 Moveable scroll
24 Compression chamber
29 Suction passage
31 Compression spring
32 Disc
33 Fixing means
34 Spring seat
35 pin
36 pin hole
51 Welding pin
52 volts
53 Adhesive material
54 Weld

Claims (10)

A movable scroll,
Forming a compression chamber for compressing fluid between the movable scroll and a fixed scroll formed by opening a suction passage for sucking the fluid into the compression chamber;
A pipe member fitted and connected to the open end of the suction passage in the fixed scroll;
A scroll compressor provided in the suction passage and provided with a suction check valve for opening and closing the pipe member;
The suction check valve has a compression spring and a valve body placed on one end of the compression spring,
A scroll compressor characterized in that the other end of the compression spring is fixed to the fixed scroll by a fixing means. The scroll compressor according to claim 1,
The scroll compressor according to claim 1, wherein the fixing means is a spring seat fixed to the fixed scroll and supporting the other end of the compression spring. In the scroll compressor according to claim 2,
The scroll compressor, wherein the spring seat is press-fitted into the fixed scroll in the suction passage. In the scroll compressor according to claim 2,
The scroll compressor, wherein the spring seat is screwed to the fixed scroll in the suction passage. The scroll compressor according to claim 1,
The scroll compressor characterized in that the fixing means is a welding pin embedded in the fixed scroll and welded at the other end of the compression spring. The scroll compressor according to claim 1,
The scroll compressor characterized in that the fixing means is a bolt that fastens and fixes the other end of the compression spring to the fixed scroll. The scroll compressor according to claim 1,
The scroll compressor according to claim 1, wherein the fixing means is an adhesive member that adhesively fixes the other end of the compression spring to the fixed scroll. The scroll compressor according to claim 1,
The scroll compressor according to claim 1, wherein the fixing means is a welded portion that welds and fixes the other end of the compression spring to the fixed scroll. A movable scroll,
Forming a compression chamber for compressing fluid between the movable scroll and a fixed scroll formed by opening a suction passage for sucking the fluid into the compression chamber;
A pipe member fitted and connected to the open end of the suction passage in the fixed scroll;
A scroll compressor provided in the suction passage and provided with a suction check valve for opening and closing the pipe member;
The suction check valve has a compression spring and a valve body placed on one end of the compression spring,
A scroll compressor comprising a locking means for locking the other end of the compression spring to the fixed scroll. The scroll compressor according to claim 9, wherein
The locking means is composed of a pin formed on the spring seat so as to protrude on the side opposite to the compression spring, and a pin hole formed on the fixed scroll so that the pin is inserted. Scroll compressor characterized by.

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