JP5246052B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor including a reed valve that opens and closes a discharge port.

  Conventionally, a compressor including a compression mechanism for compressing a fluid is known. Some compressors of this type include a reed valve that opens and closes a discharge port formed in the housing of the compression mechanism.

  A general reed valve has a flat plate-like valve body having flexibility. A seal surface is formed at the distal end portion of the valve body, and a base end portion of the valve body is fixed to an attachment surface formed in the vicinity of the discharge port. And the said valve body is bent by this fixed part as a bending fulcrum according to the pressure difference between the compression chamber of the said compression mechanism, and the said housing, or is a neutral state by elastic force from the bent state ( Or the elastic force is zero). Accordingly, the discharge port is opened and closed by the seal surface coming into contact with or separating from the valve seat surface of the discharge port.

  By the way, in the reed valve described above, when the valve body is closed, the seal surface of the valve body may stick to the valve seat surface. This occurs because the refrigerating machine oil in the fluid gas atmosphere outside the housing enters between the seal surface and the valve seat surface. If it becomes like this, it will become difficult to open the valve body once closed.

  In the compressor of Patent Document 1, the mounting surface of the valve body is formed at a position higher than the valve seat surface of the discharge port. If it carries out like this, a clearance gap will be formed between the seat surface of the said valve body, and the said valve seat surface by the part for the height. Thereby, the discharge port can be closed in a state where the valve body is bent. Since the discharge port is blocked while the valve body is bent, when the valve body is opened from the closed state, the valve body is returned from the bent state to the original position (neutral position). The elastic force to try can be used. As a result, the sealing surface of the valve body is easily separated from the valve seat surface, and the valve body is easier to open than before.

  From this, as the mounting surface of the reed valve is made higher than the valve seat surface, the gap between the seal surface of the valve body and the valve seat surface is increased, and the discharge port is blocked. The amount of deflection of the valve body increases. Then, it is considered that the greater the amount of bending, the greater the elastic force of the valve body, and the easier it is to open the valve body.

JP 2000-249067 A

  However, if the gap between the seal surface and the valve seat surface is too large, the fluid outside the housing immediately flows back into the discharge port through the gap when the valve body is open. It is possible. If this happens, the pressure difference (pressure difference between the outside of the housing and the inside of the discharge port) required to close the valve body becomes small, and there is a problem that the reed valve is difficult to close.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a compressor having a reed valve that opens and closes a discharge port that discharges fluid, after the fluid is discharged from the discharge port. The purpose is to make the valve easier to close.

  The first invention includes a housing (20a) in which a cylinder chamber (25) is formed, a discharge port (2) that passes through a wall of the housing (20a) and opens to the cylinder chamber (25), A valve body (8a) for opening and closing the discharge port (2), and when the valve body (8a) is in a neutral position, the sealing surface of the valve body (8a) and the valve seat surface of the discharge port (2) It is assumed that the compressor is equipped with a reed valve (3) that is separated from (7).

  In the compressor, the outer surface of the wall of the housing (20a) is the bottom surface (5a), and the surface extending from the bottom surface (5a) so as to surround the reed valve (3) is the peripheral side surface (5b). It is characterized by having an oil sump part (4) in which refrigeration oil accumulates inside the peripheral side surface (5b).

  In the first invention, the reed valve (3) is located in the oil sump (4). As a result, refrigeration oil accumulates around the reed valve (3). And while the valve body (8a) of the reed valve (3) is open, the opening of the discharge port (2) can be sealed with the refrigerating machine oil.

  That is, when the valve body (8a) is opened, the refrigerating machine oil in the vicinity of the opening of the discharge port (2) is transferred to the oil reservoir (by the fluid gas discharged from the opening of the discharge port (2)). 4) Pushed to the vicinity of the peripheral side (5b).

  Thereafter, when fluid gas is discharged from the discharge port (2) and the valve body (8a) is about to close, the pressure in the discharge port (2) is higher than the pressure outside the housing (20a). Since the oil is once lowered, the refrigerating machine oil pushed to the vicinity of the peripheral side surface (5b) of the oil reservoir (4) is sucked into the opening of the discharge port (2). When the refrigerating machine oil is sucked, the opening of the discharge port (2) is sealed with the refrigerating machine oil.

  The second invention is characterized in that, in the first invention, the opening area of the oil reservoir (4) becomes smaller as it approaches the bottom surface (5a) side of the oil reservoir (4).

  In the second invention, in the oil reservoir (4), the refrigerating machine oil easily flows from the vicinity of the peripheral side surface (5b) to the vicinity of the bottom surface (5a) of the oil reservoir (4). As a result, when the reed valve (3) is about to close, the refrigerating machine oil pushed to the vicinity of the peripheral side surface (5b) of the oil reservoir (4) while the reed valve (3) is open. It becomes easy to be sucked into the vicinity of the opening of the discharge port (2).

  A third invention is characterized in that, in the first or second invention, the oil sump (4) is constituted by a recessed portion formed on an outer surface of the wall body.

  In the third invention, the oil reservoir (4) can be formed by recessing the outer surface of the wall of the housing (20a).

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the discharge port (2) protrudes from the bottom surface (5a) to the bottom surface (5a) of the oil reservoir (4). The valve seat surface (7) is formed.

  In the fourth invention, the valve seat surface (7) is positioned higher than the bottom surface (5a) of the discharge port (2). In this way, for example, when the compressor is stopped, when the valve body (8a) of the reed valve (3) remains open, the refrigerating machine oil in the oil reservoir (4) is discharged It is held at the outer edge of the valve seat surface (7) without flowing down from the port (2) to the cylinder chamber.

  According to a fifth aspect of the present invention based on the fourth aspect, the base end portion of the valve body (8a) is formed on the bottom surface (5a) of the oil sump portion (4), and the peripheral side surface of the oil sump portion (4) (5b) is fixed to an inclined surface (6a) inclined obliquely upward toward the inward of the oil sump (4), the horizontal length of the inclined surface (6a) is L1, and the inclined surface (6a) And the horizontal distance between the inclined surface (6a) and the valve seat surface (7) is ΔL, the height H of the valve seat surface (7) is H1 <H ≦ H1 × ( It is characterized by satisfying the relationship (L1 + ΔL) / ΔL).

  In the fifth invention, the reed valve (3) is determined by determining the height H of the valve seat surface (7) so as to satisfy the relationship of the above equation, as compared with the case where the relationship of the above equation is not satisfied. When the valve body (8a) closes, the sealing surface of the valve body (8a) and the valve seat surface (7) are likely to come into contact with each other.

  For example, if the height H of the valve seat surface (7) is made too lower than the height H1 of the inclined surface (6a), the gap between the seal surface and the valve seat surface (7) becomes too large. The discharge port (2) cannot be closed unless the valve body (8a) is largely bent in the vicinity of the valve seat surface (7).

  However, if the height H of the valve seat surface (7) is within the range obtained by the above equation, the gap between the seal surface and the valve seat surface (7) becomes relatively small, and the valve body (8a ) Can close the discharge port (2) even if the valve seat surface (7) is not largely bent.

  In addition, the closer the height H of the valve seat surface (7) is within a range not exceeding H1 × ((L1 + ΔL) / ΔL), the lower the deflection of the valve body (8a), the lower the discharge port (2). Can be closed.

  According to a sixth invention, in any one of the first to fifth inventions, the refrigeration oil contained in the fluid discharged from the discharge port (2) is disposed above the oil reservoir (4). An oil separation plate (48) that is separated from the oil and dropped is provided.

  In the sixth aspect of the invention, by providing the oil separation plate (48), the refrigeration oil can easily accumulate in the oil reservoir (4).

  According to a seventh invention, in any one of the first to sixth inventions, the valve body (8a) and the valve seat surface (7) of the discharge port (2) are separated from each other. A first fulcrum member (8b) that comes into contact with a first deflection fulcrum (b) when the body (8a) is bent, and the seal located on the distal end side of the valve body (8a) with respect to the first fulcrum member And a second fulcrum member (6) that abuts against a second deflection fulcrum (a) when the valve body (8a) is bent so that the valve seat surface (7) abuts against the surface. It is characterized by that.

  In the seventh invention, the second bending fulcrum (a) is positioned closer to the distal end side of the valve body (8a) than the first bending fulcrum (b), whereby the valve body (8a) is closed. The spring constant of the valve body (8a) is larger than the spring constant of the valve body (8a) when the valve body (8a) is opened.

  According to the present invention, by providing the oil reservoir (4), while the valve body (8a) of the reed valve (3) is open, the refrigerating machine oil of the oil reservoir (4) is used for the discharge port. The opening of (2) can be sealed. As a result, it is possible to prevent the fluid gas outside the housing (20a) from flowing back to the discharge port (2) while the valve body (8a) is open.

  Thereby, unlike the conventional case, the pressure difference necessary for closing the valve body (8a) is maintained, and the valve body (8a) can be easily closed.

  According to the second aspect of the invention, when the valve body (8a) of the reed valve (3) is about to close, the refrigerating machine oil in the oil reservoir (4) opens the discharge port (2). It becomes easy to be sucked into the vicinity of the club. Thereby, the opening part of the said discharge port (2) can be sealed quickly.

  Moreover, according to the said 3rd invention, the said oil sump part (4) can be formed by denting the outer surface of the wall body of the said housing (20a). Thus, for example, the oil reservoir (4) is more easily formed than an annular wall body standing on the outer surface of the housing (20a) so as to surround the valve body (8a) of the reed valve (3). Can be formed.

  According to the fourth invention, for example, when the valve body (8a) of the reed valve (3) is kept open when the compressor is stopped, the oil reservoir (4) The refrigerating machine oil can be held on the outer edge portion of the valve seat surface (7). Thus, even when the reed valve (3) is opened after the operation of the compressor is resumed, the opening of the discharge port (2) can be quickly sealed with the retained refrigeration oil.

  According to the fifth aspect of the invention, in the reed valve (3), the valve body (8a) closes the discharge port (2) without being largely bent near the valve seat surface (7). Can do. Thereby, since the said valve body (8a) does not bend largely, the said valve seat surface (7) can be reliably obstruct | occluded with the sealing surface of the said valve body (8a).

  According to the sixth aspect of the present invention, since the oil separator plate (48) is provided, the refrigerating machine oil is easily collected in the oil sump part (4), so that the refrigerating machine oil in the oil sump part (4) is reduced. The shortage can be suppressed.

  According to the seventh aspect, the spring constant of the valve body (8a) when the reed valve (3) is closed can be made larger than the spring constant when the reed valve (3) is opened. Thereby, when the said reed valve (3) is closed, the said valve body (8a) bends, and the elastic force stored in this valve body (8a) itself becomes large. As a result, the valve body (8a) can be easily opened.

It is a longitudinal section of a compressor concerning an embodiment of the present invention. It is sectional drawing which shows the principal part of the compression mechanism of the compressor which concerns on embodiment of this invention. It is an enlarged view near the reed valve of the compressor concerning the embodiment of the present invention. It is a figure which shows the state of a reed valve immediately after a compressor stops. It is a figure which shows the state in which the reed valve is open. It is a figure which shows the state which a reed valve tends to close. It is a figure showing the state where a reed valve is closed.

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

  As shown in FIGS. 1 and 2, the compressor of the present embodiment is constituted by a so-called rotary piston type rotary compressor (1) (hereinafter simply referred to as “compressor (1)”). The compressor (1) is configured as a completely sealed type in which a compression mechanism (20) and an electric motor (30) for driving the compression mechanism (20) are housed in a dome-shaped casing (10). .

  The compressor (1) is configured as a variable capacity compressor in which the electric motor (30) is inverter-controlled and the capacity is variable stepwise or continuously. And this compressor (1) drives a compression mechanism (20) with an electric motor (30), for example, sucks and compresses a refrigerant, then discharges it and circulates it in a refrigerant circuit.

  A suction pipe (14) is provided at the lower part of the casing (10), and a discharge pipe (15) is provided at the upper part.

  The compression mechanism (20) includes a cylinder (21), a front head (22), a rear head (23), and a piston (24). The front head (22) is fixed to the upper end of the cylinder (21) and the rear head (23) is fixed to the lower end, thereby forming the housing (20a) of the compression mechanism (20).

  The cylinder (21) is formed in a thick cylindrical shape. A cylindrical cylinder chamber (25) is defined between the inner peripheral surface of the cylinder (21), the lower end surface of the front head (22), and the upper end surface of the rear head (23). The cylinder chamber (25) is configured such that the piston (24) rotates in the cylinder chamber (25).

  The electric motor (30) includes a stator (31) and a rotor (32). A drive shaft (33) is coupled to the rotor (32). The drive shaft (33) passes through the center of the casing (10) and penetrates the cylinder chamber (25) in the vertical direction. Bearing parts (22a, 23a) for supporting the drive shaft (33) are formed in the front head (22) and the rear head (23), respectively.

  The drive shaft (33) is constituted by a main body (33b) and an eccentric part (33a) located in the cylinder chamber (25). The eccentric portion (33a) is formed to have a larger diameter than the main body portion (33b) and is eccentric by a predetermined amount from the rotation center of the main body portion (33b). A piston (24) of the compression mechanism (20) is attached to the eccentric part (33a). As shown in FIG. 2, the piston (24) is formed in an annular shape, and its outer peripheral surface is formed so as to substantially contact with the inner peripheral surface of the cylinder (21) at one point.

  The drive shaft (33) is formed with a main oil supply passage (not shown) along the axial direction. In addition, an oil supply pump (34) is provided at the lower end of the drive shaft (33), and the refrigerating machine oil stored in the bottom (35) in the casing (10) is accompanied with the rotation of the drive shaft (33). It is configured to pump up. The main oil supply passage is configured to supply the refrigerating machine oil pumped up by the oil supply pump (34) to each sliding portion of the compression mechanism (20).

  A blade groove (21a) is formed in the cylinder (21) along the radial direction of the cylinder (21). A blade (26) formed in a rectangular plate shape is mounted in the blade groove (21a) so as to be slidable in the radial direction of the cylinder (21). The blade (26) is urged radially inward by a spring (27) provided in the blade groove (21a), and the tip always contacts the outer peripheral surface of the piston (24).

  The blade (26) partitions a cylinder chamber (25) between the inner peripheral surface of the cylinder (21) and the outer peripheral surface of the piston (24) into a suction side and a discharge side. The cylinder (21) passes through the cylinder (21) from the outer peripheral surface to the inner peripheral surface in the radial direction, and is a suction chamber (hereinafter simply referred to as a suction chamber on the suction side of the suction pipe (14) and the cylinder chamber (25)). A suction port (28) for communicating with the suction chamber (25a) is formed.

  The front head (22) has a discharge chamber (hereinafter simply referred to as a discharge chamber) (25b) and a casing (10) on the discharge side of the cylinder chamber (25) that penetrates in the axial direction of the drive shaft (33). A discharge port (2) that communicates with the inner space is formed.

  The front head (22) is provided with a reed valve (3) for opening and closing the discharge port (2). The front head (22) is provided with a muffler (48) that covers the upper surface of the front head (22), and a muffler chamber (49) for silencing the refrigerant inside the muffler (48). Is formed.

  As shown in FIG. 3, a concave oil sump (4) is provided on the upper surface of the front head (22). The oil sump (4) is formed by recessing the upper surface of the front head (22). Note that the area of the opening of the oil reservoir (4) becomes smaller as it approaches the bottom side of the oil reservoir (4).

  An opening of the discharge port (2) is formed on the bottom surface (5a) of the oil reservoir (4) so as to protrude from the bottom surface (5a). A mounting base (6) for attaching the reed valve (3) is formed in the vicinity of the discharge port (2). Here, the mounting base (6) has an inclined surface (6a) that is inclined obliquely upward in the direction from the peripheral side surface (5b) of the oil reservoir (4) toward the discharge port (2) on the upper surface thereof. doing. The opening portion of the discharge port (2) is formed with a valve seat surface (7) with which the seal surface of the reed valve (3) abuts when the reed valve (3) is closed.

  The horizontal length of the inclined surface (6a) is L1, the height of the inclined surface (6a) is H1, and the horizontal distance between the inclined surface (6a) and the valve seat surface (7) is ΔL. In this case, the height H of the valve seat surface (7) satisfies the relationship of H1 <H ≦ H1 × ((L1 + ΔL) / ΔL). The valve seat surface (7) is parallel to the inner surface of the front head (22), that is, the surface facing the cylinder chamber (25). By making them parallel in this way, the inner surface of the front head (22) can be used as a reference surface, and the valve seat surface (7) can be easily formed.

  The reed valve (3) includes a valve body (8a) and a valve presser (8b). The valve body (8a) has flexibility and is formed in a rectangular shape. The sealing surface is located at the tip of the valve body (8a).

  The valve body (8a) is overlapped with the valve retainer (8b) from above the valve body (8a), and is sandwiched between the valve retainer (8b) and the mounting base (6). The valve retainer (8b) and the valve body (8a) are both fixed to the mounting base (6) by a fastening bolt (9) on the base end side of the valve body (8a). Note that when the valve body (8a) is in a neutral position (a position where it is not elastically deformed), there is a gap between the seat surface of the valve body (8a) and the valve seat surface (7) of the discharge port (2). Is formed.

-Driving action-
Next, after describing the operation of the compressor (1) described above, the operation of the reed valve (3) will be described.

  When the electric motor (30) is energized, the piston (24) rotates eccentrically in the cylinder chamber (25) when the drive shaft (33) rotates together with the rotor (32). Due to the eccentric rotation, the volume of the cylinder chamber (25) periodically varies, and the refrigerant in the cylinder chamber (25) is compressed.

  Specifically, the rotation angle of the drive shaft (33) is slightly rotated from the state of 0 °, and the contact portion between the outer peripheral surface of the piston (24) and the inner peripheral surface of the cylinder chamber (25) is After passing through the opening of the suction port (28), the suction port (28) is opened, and refrigerant starts to be sucked from the suction port (28) into the suction chamber (25a). Thereafter, as the rotational angle of the drive shaft (33) increases, the volume of the suction chamber (25a) gradually increases. As the volume of the suction chamber (25a) increases, the refrigerant is sucked into the suction chamber (25a). Thereafter, when the drive shaft (33) further rotates and the rotation angle of the drive shaft (33) is 360 °, that is, once, the suction port (28) is closed and the suction chamber (25a) is closed. The refrigerant is sucked into the tank.

  On the other hand, when the rotation angle of the drive shaft (33) is rotated from 0 ° in the discharge chamber (25b), the volume of the discharge chamber (25b) is gradually reduced, contrary to the suction chamber (25a). Become. As the volume of the discharge chamber (25b) decreases, the refrigerant in the discharge chamber (25b) is compressed. When the refrigerant pressure in the discharge chamber (25b) becomes equal to or higher than a predetermined pressure, the valve body (8a) of the reed valve (3) is opened, and the refrigerant in the discharge chamber (25b) is transferred to the muffler chamber (49). ), The valve body (8a) is closed. The operation of the valve body (8a) will be described later in detail.

  The refrigerant discharged into the muffler chamber (49) flows out of the muffler chamber (49) into the casing (10) after being silenced.

  Thereafter, when the drive shaft (33) further rotates and the drive shaft (33) rotates almost once and the rotation angle is near 360 °, the discharge of the refrigerant from the discharge chamber (25b) is completed. . When the refrigerant is discharged, part of the refrigerating machine oil supplied from the oil pump (34) of the drive shaft (33) to each sliding portion of the compression mechanism (20) is also discharged together with the refrigerant. The refrigerant mixed with refrigerating machine oil collides with the wall of the muffler (48) and is silenced.

  In addition, the refrigerating machine oil is separated from the refrigerant by this collision. The separated refrigerating machine oil falls from the inner wall surface and accumulates in the oil reservoir (4). That is, the wall body of the muffler (48) also serves as an oil separation plate. By continuously performing such operations, the refrigerant in the cylinder chamber (25) is compressed.

  Next, the operation of the reed valve (3) will be described with reference to FIGS.

  A state immediately after the compressor (1) is stopped is shown in FIG. In this state, the reed valve (3) is open. For this reason, it was in the position higher than the valve-seat surface (7) of the said discharge port (2) among the refrigerating machine oil collected in the said oil sump part (4) by the driving | operation before the stop of the said compressor (1) The refrigerating machine oil flows down from the discharge port (2) to the cylinder chamber simultaneously with the stop of the compressor (1). As a result, the oil surface of the refrigerating machine oil has the same height as the valve seat surface (7) of the discharge port (2).

  From this state, after the compressor (1) is started, the pressure in the discharge chamber (25b) becomes larger than the pressure in the muffler chamber (49). Then, the pressure in the discharge chamber (25b) acts on the valve body (8a), and the first bending fulcrum (b) of the valve body (8a) becomes a valve presser (8b ). As a result, the valve body (8a) bends toward the valve retainer (8b). Thereby, the reed valve (3) is opened from the neutral position, and the refrigerant is discharged from the discharge port (2). The state at this time is shown in FIG. As can be seen from FIG. 5, the refrigerating machine oil that was near the opening of the discharge port (2) is near the peripheral side surface (5b) of the oil reservoir (4) by the refrigerant discharged from the discharge port (2). It is thought that the state has been pushed away. While the refrigerant is being discharged from the discharge port (2), the refrigerating machine oil separated from the refrigerant colliding with the inner wall of the muffler (48) falls into the oil reservoir (4), and the oil reservoir The amount of oil in the part (4) is gradually increasing.

  And after discharge of the refrigerant | coolant from the said discharge chamber (25b) is complete | finished, until the refrigerant | coolant is discharged from this discharge chamber (25b) again, the pressure in the said discharge port (2) becomes the said discharge port ( It becomes smaller than the refrigerant discharge in 2). Then, the pressure acting on the valve body (8a) becomes weak, and the valve body (8a) once returns to the neutral position by its elastic force. When the pressure in the discharge port (2) becomes smaller than the pressure in the muffler chamber (49), the pressure in the muffler chamber (49) acts on the valve body (8a), and the reed valve ( 3) Try to close. The state at this time is shown in FIG.

  As can be seen from FIG. 6, the refrigerating machine oil pushed to the vicinity of the peripheral side surface of the reservoir (4) is sucked into the opening of the discharge port (2). During this suction, the opening of the discharge port (2) is sealed with the refrigeration oil. Therefore, unlike the prior art, the refrigerant discharged into the muffler chamber (49) does not flow backward to the discharge port (2). Therefore, the muffler chamber (49) and the inside of the discharge port (2) are not immediately pressure-balanced, so that the reed valve (3) is easier to close than in the prior art.

  The pressure of the muffler chamber (49) acts on the valve body (8a), and the second deflection fulcrum (a) of the valve body (8a) becomes the second fulcrum member of the mounting base (6). Abuts the edge. As a result, the valve body (8a) bends in the direction opposite to the valve retainer (8b), and the seat surface of the valve body (8a) closes the valve seat surface of the discharge port (2). The state at this time is shown in FIG.

  As can be seen from FIG. 7, after the valve body (8a) is closed, the valve body (8a) of the reed valve (3) and the valve seat surface of the discharge port (2) are immersed in refrigerator oil. Become.

  Thereafter, when the refrigerant in the discharge chamber (25b) is compressed and the pressure in the discharge chamber (25b) becomes larger than the pressure in the muffler chamber (49), the reed valve (3) is further opened from the neutral position. The refrigerant is discharged again from the discharge port (2). Then, as shown in FIG. 5, the refrigerating machine oil that was again in the vicinity of the opening of the discharge port (2) is returned to the peripheral side surface (4) of the oil reservoir (4) by the refrigerant discharged from the discharge port (2). 5b) It is pushed to the vicinity. In the reed valve (3), such an operation is repeatedly performed.

  In the present embodiment, during the start of the compressor (1), the open / close cycle of the reed valve (3) is about several ms, and the lift amount of the reed valve (3) (the valve seat surface and the The gap between the sealing surface and the sealing surface is about 1 to 2 mm at the maximum. For this reason, during the start-up of the compressor (1), even if the reed valve (3) is momentarily fully opened, the refrigerating machine oil having normal viscosity flows back to the discharge port (2) at once. Do not mean.

-Effect of the embodiment-
According to this embodiment, by providing the oil reservoir (4), while the valve body (8a) of the reed valve (3) is open, the refrigerating machine oil of the oil reservoir (4) discharges the discharge. The opening of the port (2) can be sealed. As a result, it is possible to prevent the refrigerant in the muffler chamber (49) from flowing back to the discharge port (2) while the valve body (8a) is open.

  Thereby, unlike the conventional case, the pressure difference necessary for closing the valve body (8a) is maintained, and the valve body (8a) can be easily closed.

  Further, according to the present embodiment, the opening area of the oil sump portion (4) becomes smaller toward the bottom surface (5a) side of the oil sump portion (4). This makes it easier for the refrigerating machine oil to flow from the vicinity of the peripheral side surface (5b) of the oil reservoir (4) to the vicinity of the bottom surface (5a) of the oil reservoir (4). As a result, when the valve body (8a) of the reed valve (3) is about to close, the refrigeration oil in the oil reservoir (4) is easily sucked into the vicinity of the opening of the discharge port (2), The opening of the discharge port (2) can be quickly sealed.

  In addition, according to the present embodiment, the oil reservoir (4) can be formed by recessing the outer surface of the wall of the housing (20a). Thus, for example, the oil reservoir (4) is more easily formed than an annular wall body standing on the outer surface of the housing (20a) so as to surround the valve body (8a) of the reed valve (3). Can be formed.

  Further, according to this embodiment, when the compressor (1) is stopped, when the valve body (8a) of the reed valve (3) is kept open, the oil reservoir (4) Refrigerator oil can be held on the outer edge portion of the valve seat surface (7). Thus, even when the reed valve (3) is opened after the operation of the compressor is resumed, the opening of the discharge port (2) can be quickly sealed with the retained refrigeration oil.

  Further, according to the present embodiment, when the height H of the valve seat surface (7) satisfies the relationship of H1 <H ≦ H1 × ((L1 + ΔL) / ΔL), the valve body (8a However, the discharge port (2) can be closed without being largely bent in the vicinity of the valve seat surface (7). Thereby, since the said valve body (8a) does not bend largely, the said valve seat surface (7) can be reliably obstruct | occluded with the sealing surface of the said valve body (8a).

  According to the present embodiment, the muffler (48) not only silences the refrigerant discharged from the discharge port (2), but the inner wall of the muffler (48) constitutes the oil separation plate. As a result, the refrigerating machine oil easily accumulates in the oil sump part (4), so that the shortage of refrigerating machine oil in the oil sump part (4) can be suppressed.

  Further, according to the present embodiment, in the valve body (8a), the second deflection fulcrum (a) is positioned closer to the distal end side of the valve body (8a) than the first deflection fulcrum (b), The spring constant of the valve body (8a) when the valve body (8a) is closed is larger than the spring constant of the valve body (8a) when the valve body (8a) is opened. Thereby, when the said reed valve (3) is closed, the said valve body (8a) bends, and the elastic force stored in this valve body (8a) itself becomes large. As a result, the valve body (8a) can be easily opened.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

  In this embodiment, the oil reservoir (4) is formed by recessing the upper surface of the front head (22). However, the present invention is not limited to this, and it is difficult to recess the upper surface of the front head (22). In that case, the oil reservoir (4) may be formed by standing an annular wall on the outer surface of the housing (20a).

  In the present embodiment, the inner wall of the muffler (48) constitutes an oil separation plate. However, the present invention is not limited to this. Separately from the muffler (48), oil separation is performed above the oil reservoir (4). A plate may be provided.

  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 compressor including a reed valve that opens and closes a discharge port.

1 Compressor (rotary compressor)
2 Discharge port
3 Reed valve
4 Oil sump
5a Bottom
5b circumferential side
6 Mounting base (2nd fulcrum member)
6a Inclined surface
7 Valve seat
8a Disc
8b Valve retainer (first fulcrum member)
10 Casing
20 Compression mechanism
20a housing
30 electric motor
48 Muffler
49 Muffler room

Claims (7)

A housing (20a) having a cylinder chamber (25) formed therein, a discharge port (2) that passes through the wall of the housing (20a) and opens to the cylinder chamber (25), and the discharge port (2) When the valve body (8a) is in the neutral position, the sealing surface of the valve body (8a) is separated from the valve seat surface (7) of the discharge port (2). A compressor equipped with a reed valve (3) that enters a state,
The outer surface of the wall of the housing (20a) becomes the bottom surface (5a), and the surface extending from the bottom surface (5a) so as to surround the reed valve (3) becomes the peripheral side surface (5b). A compressor characterized by having an oil sump (4) for storing refrigeration oil inside. In claim 1,
The compressor characterized in that the opening area of the oil sump (4) decreases as it approaches the bottom surface (5a) side of the oil sump (4). In claim 1 or 2,
The compressor according to claim 1, wherein the oil sump (4) is formed of a recessed portion formed on an outer surface of the wall body. In any one of Claims 1-3,
The compressor is characterized in that a valve seat surface (7) of the discharge port (2) is formed on the bottom surface (5a) of the oil reservoir (4) so as to protrude from the bottom surface (5a). . In claim 4,
The base end of the valve body (8a) is formed on the bottom surface (5a) of the oil reservoir (4), and from the peripheral side surface (5b) of the oil reservoir (4), the oil reservoir (4) It is fixed to the inclined surface (6a) that is inclined obliquely upward toward the inside,
When the horizontal length of the inclined surface (6a) is L1, the height of the inclined surface (6a) is H1, and the horizontal distance between the inclined surface (6a) and the valve seat surface (7) is ΔL,
The height H of the valve seat surface (7) is
A compressor characterized by satisfying a relationship of H1 <H ≦ H1 × ((L1 + ΔL) / ΔL). In any one of claims 1 to 5,
Above the oil reservoir (4), an oil separator (48) is provided for separating and dropping the refrigeration oil contained in the fluid discharged from the discharge port (2) from the fluid. Features compressor. In any one of Claims 1-6,
The valve body (8a) contacts the first deflection fulcrum (b) when the valve body (8a) is bent so that the seal surface of the valve body (8a) and the valve seat surface (7) of the discharge port (2) are separated from each other A first fulcrum member (8b);
When the valve body (8a) is bent so that the seal surface and the valve seat surface (7) are in contact with each other and positioned closer to the distal end side of the valve body (8a) than the first fulcrum member. A compressor having a second fulcrum member (6) abutting on the two deflection fulcrums (a).

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