JP2010229956A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low cost compact scroll compressor of small number of components having a release valve function without limitation of installation site of a release valve device. <P>SOLUTION: The scroll compressor has a release function for preventing over compression or liquid compression by making a release valve 15d energized by a valve pressing body 15e to shut off communication to a compression chamber and a delivery pressure chamber move against spring energization on the valve pressing body 15e to provide communication of the compression chamber and the delivery pressure chamber to the inside of a release valve chamber of a fixed scroll in which a release channel 15i composed of a release hole 15a disposed on a compression chamber 11 side and a release valve chamber 15c disposed on a delivery pressure chamber 2f side continuously is disposed and in which a guide member 15f, the valve pressing body 15e and a release valve 15d are disposed. In the scroll compressor, a guide member 15f is fixed in the release valve chamber 15c. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a scroll compressor, and is particularly suitable for a scroll compressor having a release function for discharging a working fluid from a working chamber during overcompression or liquid compression.

  Scroll compressors used for room air conditioners and the like are used under a wide range of operating conditions, and may be operated by gas overcompression or refrigerant or refrigerant oil compression. Accordingly, there is a need for a scroll compressor that can withstand this. As a scroll compressor having such an overcompression and liquid compression prevention structure, that is, a release function, the one disclosed in Patent Document 1 is known.

  The structure of the scroll compressor will be described with reference to FIGS. As shown in FIG. 8, a discharge pressure chamber 18c is formed in the sealed container 18 having a suction port 18a and a discharge port 18b. An electric motor 19 and a compression mechanism unit 20 are accommodated in the discharge pressure chamber 18c. The compression mechanism unit 20 includes a fixed scroll 21 having a gas passage constituted by a spiral wrap, and a revolving scroll 22 having a spiral wrap 25a that is arranged to be movable opposite to the fixed scroll 21. The compression chamber 25 is configured to be engaged with each other.

  The orbiting scroll 22 is engaged with an Oldham ring 23 that enables a revolving motion while preventing the rotation of the orbiting scroll 22 on the anti-lap side, that is, the anti-compression chamber side, and is rotated by an electric motor 19. 24 is also engaged with the eccentric portion 24a.

  While turning the orbiting scroll 22 by driving the electric motor 19, the scroll compressor sucks refrigerant from the suction port 18 a, introduces the refrigerant into the compression chamber 25 formed by the fixed scroll 21 and the orbiting scroll 22, and sequentially compresses and compresses the refrigerant. The discharged refrigerant is discharged from the discharge port 21a of the fixed scroll 21 to the discharge pressure chamber 18c. The refrigerant discharged to the discharge pressure chamber 18c is discharged from the discharge port 18b of the sealed container 18.

  In this scroll compressor, the base plate 21b on the upper side of the fixed scroll 21, that is, the base plate on the side opposite to the side where the wrap capable of forming the compression chamber is formed, that is, the counter lap side of the fixed scroll. Further, a release valve device 26 capable of communicating the compression chamber 25 and the discharge pressure chamber 18c is provided. As shown in FIGS. 9 and 10, the release valve device 26 is formed such that a release hole 26a, a valve seat portion 26b, and a release valve chamber 26c are formed continuously, and their center lines are concentric. ing. The continuously formed release hole 26a and the release valve chamber 26c constitute a release communication passage, and communicate the compression chamber and the discharge pressure chamber 18c.

  Furthermore, the release valve device 26 abuts the release valve 26e on the valve seat portion 26b, and abuts a spring 26f, which is a valve pressing body locked on the spring locking portion 26h of the bush 26g, on the upper surface of the release valve 26e. . At this time, the bush 26g as a guide member and the spring 26f locked thereto are free in the release valve chamber 26c. The free state is a state in which the pressing force applied to the spring 26f is only the weight of the bush 26g.

  The retainer 16 for restricting the movement of the bush 26g and the spring 26f and holding them in the release valve chamber 26c at a predetermined position even during over-compression is a base plate 21b on the upper side of the fixed scroll 21. Are fastened by fastening bolts 27. The bush 26g is provided with a pressure relief hole 26i for discharging overcompressed gas or liquid. 26i designates not only the directly designated area but also an adjacent area without hatching (three in FIGS. 9 and 10).

  The release valve device 26 is used during overcompression when the pressure in the compression chamber 25 becomes equal to or higher than the discharge pressure in the middle of the compression stroke, or during liquid compression in which liquid refrigerant is sucked from the suction port due to temperature conditions during operation, etc. Furthermore, as shown in FIG. 10, the spring 26f is compressed and the release valve 26e is opened. The release valve 26e is opened when it is over-compressed above the set pressure “discharge pressure + (weight of the spring 26f + weight of the release valve 26e + weight of the bush 26g) / area in the circle of the valve seat portion 26b”. is there.

  As the release valve 26e opens, the gas or liquid refrigerant that has risen above the set pressure in the discharge pressure chamber 18c passes from the inside of the compression chamber 25 to the discharge pressure chamber 18c via the pressure relief hole 26i, as indicated by the white frame arrow. Discharged. Thereby, the reduction of the overcompression loss between the fixed scroll 21 and the orbiting scroll 22 and the damage of the lap can be prevented.

  After the release valve 26a is opened, the compression chamber 25 having a pressure equal to or lower than the set pressure with the rotation of the orbiting scroll is then communicated with the release hole 26a, and the spring 26f is extended as shown in FIG. The release valve 26e is closed. As described above, the states shown in FIGS. 9 and 10 are repeated at the time of overcompression or liquid compression.

  As described above, Patent Document 1 discloses a release flow path configured by continuously configuring a release hole disposed on the compression chamber side and a release valve chamber disposed on the discharge pressure chamber side. A guide member, a valve pressing body, and a release valve are disposed in the release valve chamber of the fixed scroll in which a release flow path that communicates the compression chamber and the discharge pressure chamber is disposed, and the compression chamber A release valve spring-biased by a valve pressing body so as to cut off communication between the discharge pressure chamber and the discharge pressure chamber communicates the compression chamber and the discharge pressure chamber against the spring bias of the valve pressing body. A scroll compressor having a release function for preventing over-compression or liquid compression is disclosed.

JP 2006-009781 A

  However, in the release valve device 26 of the scroll compressor disclosed in Patent Document 1, the bush 26g and the spring 26f locked to the bush 26g are set in a free state, so that their movement is restricted and further retained in the release valve chamber 26c. It is necessary to provide the retainer 16, which is the above member, and the fastening bolts 27 for fastening the retainer 16 on the base portion 21 b of the upper portion of the fixed scroll 21. Further, when the retainer 16 is installed on the base portion 21b on the fixed scroll 21, it is necessary to finish the surface of the base portion by machining in order to stabilize the distance from the bush 26g. As a result, the number of parts and man-hours increased, leaving room for improvement in cost reduction. Usually, a plurality of, for example, about four release valve devices 26 are provided. Further, the total length 26l of the bush 26g needs to secure a certain length in order to smoothly move up and down in the release valve chamber 26c. As a result, in order to install the release valve device 26, it is necessary to thicken the base portion 21b of the fixed scroll. In this respect, there remains room for improvement in reducing the weight of the compressor, reducing the overall length, and reducing the cost. It was.

  Further, in terms of performance, a space for installing the retainer 16 and the fastening bolt 27 must be provided in the fixed scroll base portion 21b. Therefore, when the installation position of the release valve device 26 is determined, It is also conceivable that it cannot be installed at a position where it is originally intended to be installed due to restrictions on the installation position or the shape of the retainer 16. Further, when the bush 26g is in a free state, the release valve 26e is instantaneously actuated and lifted upward during over-compression, thereby locking the spring 26f contacting the release valve 26e. The bush 26g is also lifted, and the lifted bush 26g instantaneously collides with the retainer 16 that restricts this movement. There is a possibility that noise may be generated by the impact.

  An object of the present invention is to realize a release function having a simple structure in a scroll compressor. Another object of the present invention is to realize a scroll compressor having a release function with good manufacturability and no noise generation.

  The object of the present invention is achieved by fixing a guide member in the release valve chamber.

  Another object of the present invention is to form a compression chamber by meshing the orbiting scroll and the fixed scroll, compress the working fluid sucked into the compression chamber, and store the compression mechanism portion, and A sealed container having a discharge pressure chamber through which compressed working fluid is discharged, and the fixed scroll communicates the compression chamber and the discharge pressure chamber when the pressure in the compression chamber rises above a set pressure. A release valve device that opens the circuit, and the release valve device opens and closes the release channel provided in the fixed scroll so as to communicate the compression chamber and the discharge pressure chamber, and the release channel. A release valve provided in such a manner, a valve pressing body for applying an elastic pressing force to the release valve when the release valve closes the release flow path, and one end of the valve pressing body fixed to a fixed scroll. The valve pressing body is disposed between the guide member and the release valve, and the release valve is achieved by a configuration having an elastic portion that is compressed in a state where the release flow path is opened. Is done.

  According to the present invention, a release function having a simple structure can be realized. In addition, according to the present invention, it is possible to realize a scroll compressor having a release function with good manufacturability and no noise generation.

Sectional drawing which shows an example of the structure of the scroll compressor concerning this invention. The cross-sectional view of the compressor shown in FIG. The expanded sectional view of the closed state of the release valve apparatus of FIG. The expanded sectional view of the open circuit state of the release valve apparatus part of FIG. The top view of the fixed scroll of FIG. The top view of the guide member of FIG. The top view which shows an example of the protrusion part of the guide member of FIG. The longitudinal cross-sectional view of the conventional scroll compressor. The expanded sectional view of the closed state of the release valve apparatus of FIG. The expanded sectional view of the open circuit state of the release valve apparatus of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent. First, a scroll compressor according to a first embodiment of the present invention will be described with reference to FIGS.

  First, the overall configuration of the scroll compressor 1 of this embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention, and FIG. 2 is a transverse sectional view of a compression mechanism portion of FIG.

  The scroll compressor 1 is composed of a high-pressure chamber type hermetic scroll compressor as in Patent Document 1, is used as a part of a refrigeration cycle such as a room air conditioner, and is used under a wide range of operating conditions. A scroll compressor 1 includes a compression mechanism unit 3 having a revolving scroll 6 and a fixed scroll 5 provided with spiral wraps 6a and 5c, an electric motor 4 for driving the compression mechanism unit 3, a compression mechanism unit 3 and an electric motor. 4 and a cylindrical vertically long sealed container 2 in which 4 is accommodated.

  The sealed container 2 is configured by welding a lid chamber 2b and a bottom chamber 2c up and down to a cylindrical case 2a. The lid chamber 2b is provided with a suction port 2d, and a side surface of the case 2a is provided with a discharge port 2e. The inside of the hermetic container 2 is a discharge pressure chamber 2f in which the compression mechanism 3 and the electric motor 4 are accommodated. A compression mechanism unit 3 is disposed at the upper part of the sealed container 2, and an electric motor 4 is disposed at the lower part, and lubricating oil 13 is stored at the bottom part.

  The compression mechanism 3 includes a fixed scroll 5 having a spiral wrap 5c on the lower side of the base plate 5d in FIG. 1, a turning scroll 6 having a spiral wrap 6a meshed with the wrap 5c, and a fixed scroll 5. And a frame 9 that is integrated by a fastening member and supports the orbiting scroll 6. Note that the orbiting scroll 6 and the fixed scroll 5 are vertically engaged. As shown in FIG. 2, the fixed scroll 5 is provided with a gas passage 5b communicating with the suction port 5a and the discharge pressure chamber 2f. The gas passage 5b is spirally formed by a spiral wrap 5c.

  An orbiting scroll 6 formed in a substantially disk shape is opposed to the fixed scroll 5 and is arranged to be orbitable. As shown in FIG. 2, a spiral wrap 6a meshing with the wrap 5c of the fixed scroll 5 is provided on the upper surface of the orbiting scroll 6, and the suction chamber 10 and the compression chamber 11 are interposed between the wrap 5c and the wrap 6a. Is formed. The fixed scroll 5 is fixed to the frame 9 by bolts 8, and the outer peripheral side of the frame 9 is fixed to the inner wall surface of the sealed container 2 by welding. The fixed scroll 5 is provided with a release valve device 15 having a release function. The frame 9 includes a main bearing 9a that rotatably supports the crankshaft 7.

  An eccentric portion 7 b of the crankshaft 7 is connected to the lower surface side of the orbiting scroll 6. An Oldham ring 12 is disposed between the lower surface side of the orbiting scroll 6 and the frame 9, and the Oldham ring 12 is engaged with a groove formed on the lower surface side of the orbiting scroll 6 and a groove formed on the frame 9. Are combined. The Oldham ring 12 functions to cause the orbiting scroll 6 to revolve without rotating due to the eccentric rotation of the eccentric portion 7 b of the crankshaft 7.

  The electric motor 4 includes a stator 4a and a rotor 4b. The stator 4a is fastened to the sealed container 2 by press fitting or the like. The rotor 4b is rotatably arranged in the stator 4a. The electric motor 4 is configured to orbit the orbiting scroll 6 via a crankshaft 7 fixed to the rotor 4b. The crankshaft 7 includes a main shaft portion 7a and an eccentric portion 7b, and is supported by a main bearing 9a and a lower bearing 17 provided on the frame 9. The eccentric portion 7 b is formed integrally with the main shaft portion 7 a of the crankshaft 7 so as to be eccentric, and is fitted to a orbiting bearing provided on the back surface of the orbiting scroll 6. The crankshaft 7 is driven by the drive of the electric motor 4, and the eccentric portion 7 b is eccentrically rotated with respect to the main shaft portion 7 a of the crankshaft 7 to drive the orbiting scroll 6.

  An intermediate pressure chamber 14 is formed between the back side of the orbiting scroll 6 and the frame 9 and serves as an intermediate pressure between the pressure of the suction port 2d and the pressure of the discharge pressure chamber 2f. The crankshaft 7 is provided with an oil supply passage 7c for guiding the lubricating oil 13 to the main bearing 9a, the lower bearing 17 and the slewing bearing, and the lubricating oil 13 is sucked into the shaft end on the motor unit side to enter the oil supply passage 7c. An oil supply pipe 7d is installed. Lubricating oil 13 sealed at the bottom of the hermetic container 2 is supplied to the main bearing 9a and the like through an oil supply passage 7c formed at the center of the crankshaft 7 due to the pressure difference between the intermediate pressure chamber 14 and the discharge pressure chamber 2f. This is called differential pressure lubrication. The intermediate pressure chamber 14 is formed in a path for supplying the lubricating oil 13 in the sealed container 2 to the sliding portion of the compression mechanism portion 3.

  In the compression mechanism unit 3, when the orbiting scroll 6 is revolving through the crankshaft 7 driven by the electric motor 4, the compression chamber 11 formed by the orbiting scroll 6 and the fixed scroll 5 moves in the center direction of the scroll. The volume is reduced in accordance with the above, and the sucked refrigerant gas is compressed. The compressed refrigerant gas is discharged to the discharge pressure chamber 2 f in the hermetic container 2 from the discharge port 5 e provided at the approximate center of the base plate 5 d of the fixed scroll 5. The suction port 2d is for guiding the refrigerant gas to the suction side of the compression mechanism unit 3 through the sealed container 2 from its upper surface. The discharge port 2e is connected to the side surface so as to communicate with the discharge pressure chamber 2f in the sealed container 2.

  In the scroll compressor 1, when the orbiting scroll 6 is swung through the crankshaft 7 by rotating the rotor 4 b of the electric motor 4, the refrigerant gas sucked from the suction port 2 d becomes the fixed scroll 5 and the orbiting scroll 6. And is discharged from the discharge port 5e provided in the center of the fixed scroll 5 to the discharge pressure chamber 2f of the sealed container 2. The discharged refrigerant gas is guided downward through a passage provided on the outer periphery of the frame 9, and after cooling the electric motor 4, the refrigerant gas is guided into the refrigeration cycle outside the sealed container 2 from the discharge port 2 e.

  Next, the release valve device 15 will be described with reference to FIGS. 3 is an enlarged sectional view of the release valve device 15 of FIG. 1 in a closed state, FIG. 4 is an enlarged sectional view of the release valve device portion 15 of FIG. 3, and FIG. 5 is a plan view of the fixed scroll of FIG. .

  The release valve device 15 is for discharging from the compression chamber 11 to the discharge pressure chamber 2f when the pressure in the compression chamber 11 becomes equal to or higher than the approximate discharge pressure, and a plurality of compression chambers formed in the compression mechanism section. Are installed at a plurality of locations of the fixed scroll 5 (see FIG. 5). This release valve device 15 is normally closed.

  Depending on the operating conditions such as gas refrigerant or room air conditioner, liquid refrigerant or mainly mist-like lubricating oil 13 is drawn into the compression chamber 11 from the suction port 2d as a working fluid. When the working fluid is compressed by the orbiting motion of the orbiting scroll 6 and the pressure in the compression chamber 11 becomes approximately equal to or higher than the discharge pressure, the release valve device 15 is opened and the compression chamber 11 and the discharge pressure are opened. It communicates with the chamber 2f. As shown in FIGS. 3 and 4, the release valve device 15 includes a release channel 15i, a release valve 15d, an elastic valve pressing body 15e (coil spring), and a guide member 15f. The release channel 15i is composed of a release hole 15a and a release valve chamber 15c, and is formed on the base plate 5d of the fixed scroll 5 so as to communicate the compression chamber 11 and the discharge pressure chamber 2f.

  The release valve 15d is for opening and closing the release flow path 15i. The valve pressing body 15e is for applying an elastic pressing force to the release valve 15d when the release valve 15d is closed. The valve pressing body 15e is installed in the release valve chamber 15c, one end is locked to the guide member 15f, and the other end is released. It is in contact with the valve 15d. At this time, the valve pressing body 15e adjusts the position of the guide member 15f so as to generate a slight elastic pressing force so as to urge the release valve 15d in the closing direction. That is, it should be made to a level that hardly exerts an elastic pressing force. Otherwise, the release function will not be fully effective.

  The guide member 15f is pushed into the release valve chamber 15c by determining the size to be pushed with a jig, and is fixed in contact with the inner peripheral wall at a plurality of points as will be described later. In order to make the above fixation more reliable, a concave portion may be provided on the inner peripheral wall of the point contact portion. Or, in order to facilitate the positioning of the point contact, the recess may be annular.

  A release hole 15a communicating with the compression chamber 11, an annular valve seat 15b, and a release valve chamber 15c communicating with the discharge pressure chamber 2f are formed continuously from the fixed scroll 5, and the compression chamber 11 and the discharge pressure chamber 2f are formed. The release flow path 15i that communicates with each other is configured. Accordingly, the release flow path 15i is configured by a continuous configuration of a release hole disposed on the compression chamber side and a release valve chamber disposed on the discharge pressure chamber side, and the compression chamber and the discharge pressure chamber are formed. Communicate with.

  The release hole 15a has a small diameter, the release valve chamber 15c has a larger diameter, and a valve seat 15b is formed at a step portion of the release valve chamber 15c. That is, the release hole 15a, the valve seat 15b, and the release valve chamber 15c are formed in a region in the thickness direction of the base plate 5d of the fixed scroll 5.

  In particular, the release hole 15a is formed so that its inner diameter dimension and length dimension are made as small as possible so that its volume that becomes the dead volume of the compression chamber 11 is as small as possible. Further, the release valve chamber 15c has a diameter larger than that of the release hole 15a so that the size of the valve pressing body 15e that can sufficiently secure the function can be obtained. The release valve chamber 15c is provided with a release valve 15d that opens when the pressure in the compression chamber 11 exceeds the set pressure of the discharge pressure chamber 2f and releases the gas or fluid in the compression chamber 11 to the discharge pressure chamber 2f. It is installed. The set pressure is “discharge pressure + (weight of the release valve 15d + biasing force in the closing direction by the valve pressing body 15e) / area in the circle of the valve seat 15b”, which is released when the pressure is excessively compressed. The valve 15d opens. Since the guide member 15f is fixed, it is not necessary to consider the weight. The reason why the weight of the valve pressing body 15e is not considered is that the guide member 15f of the valve pressing body 15e is fixed as will be described later. If the valve pressing body 15e is not fixed to the guide member 15f, its weight must be taken into consideration.

  The annular valve seat 15b provided on the boundary surface between the release hole 15a and the release valve chamber 15c on the release valve chamber 15c side of the release hole 15a has a release valve formed of a disc-shaped spring steel plate or the like. It arrange | positions so that 15d may contact | abut. A guide member 15f constituting a guide portion and a valve pressing body 15e constituting an elastic portion are mounted on the upper portion of the release valve 15d. The valve pressing body 15e is a coil spring and is formed of a thin steel plate or the like, and is configured by integrally combining one end of the valve pressing body 15e with a part of the guide member 15f by press-fitting or the like. The release channel 15i is formed to extend vertically, and the release valve 15d is configured to receive a load from the valve pressing body 15e. That is, the release valve 15d is urged in the closing direction from the valve pressing body 15e.

  Note that the pressing force due to “the weight of the release valve 15d + the closing direction biasing force by the valve pressing body 15e” is extremely small. In the above configuration, when the electric motor 4 is driven to rotate and the orbiting scroll 6 performs the orbiting motion, the refrigerant gas is guided to the suction chamber 10 and the compression chamber 11 from the suction port 2d, and the compressed gas is discharged from the discharge port 5e of the fixed scroll 5. It is discharged to the discharge pressure chamber 2f and further discharged from the discharge port 2e of the sealed container 2 to the piping of a refrigeration cycle such as a room air conditioner.

  During the normal operation in which the pressure in the compression chamber 11 is equal to or lower than the set pressure in the process of compressing the refrigerant gas, the pressure in the discharge pressure chamber 2f is higher than the pressure in the compression chamber 11, so the release valve 15d is caused by the pressure difference. The release hole 15a is closed by contacting the valve seat 15b (see FIG. 3). During this closing, a differential pressure between the pressure in the discharge pressure chamber and the pressure in the compression chamber is applied to the upper surface of the release valve 15d, so that this closing is continued. Thus, during normal operation, the working fluid is not discharged from the release valve device 15 into the discharge pressure chamber 2f. At this time, the volume of the release hole 15a becomes a part of the volume of the compression chamber 11 and becomes a dead volume accompanied by re-expansion loss of the gas remaining in the compression stroke. Therefore, as described above, it is desirable to make the volume as small as possible. .

  On the other hand, when the pressure in the compression chamber 11 exceeds the set pressure during the process of compressing the refrigerant gas or liquid refrigerant or lubricating oil under the operating conditions of the room air conditioner or the like, the pressure in the compression chamber 11 is the discharge pressure. The pressure of the chamber 2f becomes higher, and the pressure difference causes the release valve 15d to move away from the valve seat 15b against the bias in the closing direction by the valve pressing body 15e, thereby opening the release hole 15a (see FIG. 4). As the release valve 15d moves, the valve pressing body 15e is contracted. During this time, the working fluid in the compression chamber 11 passing through the release hole 15a passes through the valve seat passage 15h between the valve seat 15b and the release valve 15d as shown by the white frame arrow in FIG. It passes through the release valve periphery 15j between the inner wall of the chamber 15c and reaches the discharge pressure chamber 2f side of the release valve 15d. Thereafter, the overcompressed working fluid passes through the gap between the guide member 15f and the inner peripheral wall and is discharged into the discharge pressure chamber 2f. At this time, in order to reduce the flow resistance of the working fluid, a plurality of escape holes as in the conventional example may be provided in the guide member 15f itself.

  Such a release function can prevent over-compression loss and damage to the scroll wrap.

  After the release valve 15d is opened, the compression chamber 11 that has become a pressure equal to or lower than the set pressure with the rotation of the orbiting scroll is then communicated with the release hole 15a, and the valve pressing body 15e extends to release valve 15d. Closes. As described above, the states shown in FIGS. 4 and 3 are repeated during the overcompression operation.

  In the scroll compressor 1 according to the present embodiment, the guide member 15f is directly fixed in the release valve chamber 15c. Therefore, the retainer 16 that restricts the movement of the guide member 15f and the valve pressing body 15e on the base plate 5d of the fixed scroll 5 and the like There is no need to provide a fastening bolt 27 for fixing the bolt. For this reason, the number of components can be reduced, and the release hole 15a can be installed at an optimum position as an action of the release valve without being restricted by the shape of the retainer 16 and the installation position of the fastening bolt 27. it can.

  Further, according to the present embodiment, the release channel 15i is connected to the release hole 15a communicated with the compression chamber 11, the release hole 15a and the discharge pressure chamber 2f, and the release channel 15i has a larger diameter than the release hole 15a. And a valve chamber 15c. The valve pressing body 15e and the guide member 15f are disposed in the release valve chamber 15c, and the guide member 15f is fixed in the release valve chamber 15c with the valve pressing body 15e locked. Since the valve pressing body 15e includes an elastic portion that generates an elastic pressing force, the volume of the release hole 15a can be reduced to reduce the re-expansion loss of the working fluid caused by the release hole 15a, thereby obtaining high performance.

  Further, according to the present embodiment, the guide member 15f has protrusions that are fixed to the inner diameter of the release valve chamber by three or more point contacts on the inner diameter of the release valve chamber 15c. Thereby, the deformation stress generated in the fixed scroll when fixed to the inner diameter can be relieved significantly, and the elastic portion is formed by the valve pressing body 15e attached to the guide member 15f, so that it is inexpensive and highly reliable. An elastic pressing force can be obtained by the valve pressing body 15e.

  Here, FIG. 6 shows a schematic diagram for explaining the protrusion of the guide member. FIG. 6 is a plan view of the guide member, which is the protrusion 15k. The guide member can be fixed by bringing the tip of the projection 15k into contact with the inner diameter of the release valve chamber. Further, the number of protrusions may be four or more as shown in FIG. Furthermore, according to the present embodiment, the guide member 15f can be manufactured at a low cost even in a complicated shape by molding by pressing.

  Further, according to the present embodiment, the length of the release valve chamber 15c (the length from the release valve 15d to the upper surface of the fixed scroll 5) is set in the range of 6 mm to 12 mm, so that the base plate 5d of the fixed scroll 5 is provided. Since the thickness of the compressor can be reduced, the compressor body can be made lighter and smaller. Conventionally, the length of the release valve chamber 15c is 12.3 mm, and if it is in the range of 6 mm to 12 mm, the spring that has been used as a valve pressing body can be used as it is. Moreover, the operating characteristics of the valve seat can be made the same.

  Further, according to the present embodiment, the guide member 15f is fixed to the fixed scroll 5 in the release valve chamber 15c, so that the surface of the base plate 5d portion provided with the release flow path 15i of the fixed scroll is not processed. Therefore, the processing cost can be greatly reduced. This unprocessed surface is, for example, leaving the base plate 5b portion as a cast surface.

  Furthermore, according to the present embodiment, since the guide member 15f has a plate thickness in the range of 0.3 mm to 1.0 mm, the guide member itself can exert an elastic force. It can be securely fixed to the indoor diameter. The material of the guide member 15f is a cold rolled steel plate and is generally used for pressing a thin plate. If the plate thickness is in the range of 0.3 mm to 1.0 mm, it can be used as a generally available material, so the cost can be reduced. Since the parts themselves are small, if the plate thickness is too thick, the workability deteriorates, but the workability is not particularly problematic as long as it is in the above range.

  As described above, a low-cost release function with a small number of components can be realized.

DESCRIPTION OF SYMBOLS 1 Scroll compressor 2,18 Sealed container 2a Case 2b Cover chamber 2c Bottom chamber 2d, 5a, 18a Inlet 2e, 18b Outlet 2f, 18c Discharge pressure chamber 3, 20 Compression mechanism part 4, 19 Electric motor 4a Stator 4b Rotation Child 5, 21 Fixed scroll 5b Gas passage 5c, 6a, 22a Wrap 5d, 6b, 21b Base plate 5e, 21a Discharge port 6, 22 Orbiting scroll 7, 24 Crankshaft 7a Main shaft portion 7b Eccentric portion 8 Bolt 9 Frame 9a Main bearing DESCRIPTION OF SYMBOLS 10 Suction chamber 11, 25 Compression chamber 12, 23 Oldham ring 13 Lubricating oil 14 Intermediate pressure chamber 15, 26 Release valve device 15a, 26a Release hole 15b Valve seat 15c, 26c Release valve chamber 15d, 26e Release valve 15e Valve press body 15f Guide member 15h Valve seat passage 15i Release passage 15j Release valve Despite 15k projections 16 retainer 17 lower bearing 26b valve seat 26f spring 26g bushes 26h spring engaging portion 26i pressure relief holes 27 fastening bolt

Claims (8)

A release flow path configured by a continuous configuration of a release hole disposed on the compression chamber side and a release valve chamber disposed on the discharge pressure chamber side, the compression chamber and the discharge pressure A guide member, a valve pressing body, and a release valve are disposed in the release valve chamber of the fixed scroll in which a release flow path communicating with the chamber is disposed, and communication between the compression chamber and the discharge pressure chamber is blocked. The release valve spring-biased by the valve pressing body prevents over-compression or liquid compression by communicating the compression chamber and the discharge pressure chamber against the spring bias of the valve pressing body. In a scroll compressor having a release function for
A scroll compressor having a guide member fixed in the release valve chamber. In claim 1,
A scroll compressor characterized in that the surface of the base plate on the side opposite to the wrap of the fixed scroll which is opposite to the side where the wrap capable of forming the compression chamber is formed is left as a cast surface. . In claim 1 or 2,
The scroll compressor, wherein the guide member is fixed to the release valve chamber by three or four point contacts. A compression chamber is formed by meshing the orbiting scroll and the fixed scroll, the compression mechanism that compresses the working fluid sucked into the compression chamber, and the working fluid that contains the compression mechanism and is compressed in the compression chamber is discharged. And a sealed container that forms a discharge pressure chamber,
The fixed scroll includes a release valve device that opens the communication so that the compression chamber communicates with the discharge pressure chamber when the pressure in the compression chamber rises above a set pressure, and the release valve device includes the compression chamber A release flow path provided in the fixed scroll so as to communicate with the discharge pressure chamber, a release valve provided to open and close the release flow path, and when the release valve closes the release flow path And a guide member that fixes one end of the valve pressing body to a fixed scroll, and the valve pressing body is disposed between the guide member and the release valve. The scroll compressor has an elastic part that is compressed in a state in which the release valve is opened. In claim 4,
The release flow path includes a release hole communicated with the compression chamber, and a release valve chamber communicated with the release hole and the discharge pressure chamber and having a larger diameter than the release hole, and the valve pressing body. And the guide member is disposed in the release valve chamber, and includes a guide member that fixes one end of the valve pressing body to the fixed scroll in the release valve chamber, and an elastic portion that generates an elastic pressing force. Scroll compressor.   6. The scroll compressor according to claim 5, wherein the guide member has protrusions that are fixed to the inner diameter of the release valve chamber by making point contact with the inner diameter of the release valve chamber at three or more locations. Is a coil spring mounted on the guide member.   5. The scroll compressor according to claim 4, wherein the length of the release valve chamber is in the range of 6 mm to 12 mm.   5. The scroll compressor according to claim 4, wherein a thickness of the guide member is in a range of 0.3 mm to 1.0 mm.

Images