JP2009174366A - Seal structure and compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve sealability between a muffler member and a head member of a compressor. <P>SOLUTION: The seal structure 50 is for sealing between a front head 32 and a front muffler 31. The front head 32 has a discharge port from which compressed refrigerant is discharged, and a front muffler 31 is arranged so that a muffler space is formed between the front muffler 31 and the front head 32. The front head 32 includes: a head body 32c having a first mounting part 32b having two first fastening parts 32e; and a bearing part 32d projected from the head body 32c. The front muffler 31 includes: a muffler body 31b having an opening 31a to/from which the bearing part 32d is fitted/inserted; and a second mounting part 31c having two fastening parts 31d. In the second mounting part 31c of the front muffler 31 before being fastened to the front head 32, a part corresponding to a portion between two second fastening parts 31d is extended on a side opposite to the muffler body 31b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seal structure between a muffler member and a head member of a compressor, and a compressor provided with the seal structure.

  A general rotary compressor includes a cylinder, a roller that rotates in a cylinder chamber formed in the cylinder, a head member having a discharge port that discharges a refrigerant compressed by the rotation of the roller, and a head member. And a muffler member disposed so that a muffler space is formed therebetween. FIG. 11 is a schematic diagram showing a seal structure between a head member and a muffler member according to an example of the prior art. As shown in FIGS. 11A and 11B, in the conventional seal structure 250 of the head member 432 and the muffler member 431, the muffler member 431 having a cup-type structure having a peripheral wall 431a is formed by a plurality of bolts 441. The muffler member 431 forms a muffler space by covering the concave portion 432A of the head member 432 (see, for example, Patent Document 1).

  However, in the above-described conventional seal structure 250, unless the outer peripheral surface 432a of the head member 432 and the inner peripheral surface of the peripheral wall 431a of the muffler member 431 are finished with high accuracy, respectively, the outer peripheral surface 432a of the head member 432 and the muffler member When a gap is formed between the inner peripheral surface of the peripheral wall 431a of 431, there are problems such as refrigerant gas leaking from the gap and an increase in sound. Further, since it has to be pushed in by applying a strong pressure, there are problems such as difficulty in assembling and distortion of the head member.

Accordingly, various seal structures have been proposed in order to solve the above-described problems such as refrigerant gas leaking from the head member and the muffler member (see, for example, Patent Document 2). In the seal structure 550 between the head member 532 and the muffler member 531 disclosed in Patent Document 2, the muffler member 531 having a face seal structure is fixed to the head member 532 by a plurality of bolts 541 as shown in FIG. Yes. At this time, the fastening portion 531a of the muffler member 531 and the fastening portion 532a of the head member 532 are fastened, whereby the annular attachment portion 531b of the muffler member 531 is fixed to the annular attachment portion 532b of the head member 532. .
Japanese Patent Laid-Open No. 6-2687 Registered Utility Model No. 3077783

  However, in the above-described seal structure 550 of the muffler member 531 having the face seal structure and the head member 532, the muffler member 531 is fixed to the head member 532 only by the fastening force at the respective fastening portions 531a and 532a. Since the pressing force with which the muffler member 531 is pressed against the head member 532 is weak at a portion corresponding to the adjacent two fastening portions 531a and 532a, a gap may be generated and the refrigerant gas may leak. In particular, in the central portion of the portion corresponding to the two adjacent fastening portions 531a and 532a, the pressing force becomes the weakest, so that a gap is easily formed.

  Accordingly, an object of the present invention is to provide a seal structure and a compressor that can improve the sealing performance between the head member and the muffler member of the compressor.

  A seal structure according to a first aspect of the present invention is a seal structure of a head member having a discharge port through which a compressed refrigerant is discharged and a muffler member arranged so that a muffler space is formed between the head member. The head member has a bearing hole into which the shaft member is inserted and has an annular first mounting portion in which a plurality of first fastening portions are formed, and the bearing hole from the head body. The muffler member includes a cylindrical muffler main body having an opening formed at one end of the muffler member, and an other end of the muffler main body. An annular second mounting portion formed with a plurality of second fastening portions extending and arranged to correspond to the plurality of first fastening portions, and the first fastening portion and the second fastening portion By fastening the part In the second mounting portion of the muffler member, the first mounting portion and the second mounting portion are fixed to the head member in contact with each other, and are fastened to the head member. The at least part of the portion corresponding to the plurality of second fastening portions protrudes to the opposite side of the muffler body.

  In this seal structure, not only the fastening force between the first fastening portion of the head member and the second fastening portion of the muffler member, but also at least a part of the portion corresponding to the space between the plurality of second fastening portions of the muffler member is the muffler body. By projecting to the opposite side, the pressing force from the portion corresponding to the plurality of second fastening portions to the portion corresponding to the plurality of first fastening portions increases. Thereby, the sealing performance of the 1st attaching part of a head member and the 2nd attaching part of a muffler member is improved. Further, even if the area of the second attachment portion of the muffler member is reduced, the sealing performance is ensured, so that the respective outer diameters of the muffler member and the head member can be reduced. Thereby, the muffler member and the head member can be reduced in weight, and the manufacturing cost can be reduced.

  Here, “at least a part of the portion corresponding to the plurality of second fastening portions protrudes on the side opposite to the muffler body” means that, for example, the plurality of second fastening portions have a planar shape, When the contact surface with the first fastening portion is on the same plane, it means that it projects from the same plane to the opposite side of the muffler body.

  The seal structure according to the second invention is the seal structure according to the first invention, and all of the portions corresponding to between the two adjacent second fastening portions project to the opposite side of the muffler body. It is characterized by.

  In this seal structure, the pressing force from all of the portions corresponding to the two adjacent second fastening portions to the portion corresponding to the two adjacent first fastening portions is increased, so that the first mounting of the head member is performed. The sealing performance between the portion and the second mounting portion of the muffler member is further improved. Moreover, since the part where the force with respect to the 1st attaching part of a head member is weak locally from the 2nd attaching part of a muffler member disappears, it can suppress that a head member is distorted partially. Accordingly, since it is possible to suppress the formation of a gap between the first mounting portion of the head member and the second mounting portion of the muffler member, the performance of the compressor is improved and the reliability is also improved. .

  A seal structure according to a third invention is the seal structure according to the second invention, characterized in that the amount of protrusion at the center of the portion corresponding to the space between the two adjacent second fastening portions is the largest. .

  In this seal structure, by increasing the pressing force of the central portion where the pressing force is weak because it is farthest from the second fastening portion between two adjacent second fastening portions, the first mounting portion of the head member and the muffler member It is possible to prevent a gap from being formed between the second mounting portion and the sealing performance is further improved.

  A seal structure according to a fourth aspect of the present invention is the seal structure according to the second or third, wherein a portion corresponding to the space between the two adjacent second fastening portions has a taper shape in which a protruding amount increases toward the outside. It is characterized by being configured.

  In this seal structure, when the second attachment portion of the muffler member is fixed to the first attachment portion of the head member, the portion corresponding to the interval between the two adjacent second fastening portions is based on the other end of the muffler body. The pressing force is further increased by the addition of a repulsive force caused by bending toward the muffler body. Thereby, the sealing performance between the first attachment portion of the head member and the second attachment portion of the muffler member is further improved. In addition, a portion corresponding to between the two adjacent second fastening portions is surely in contact from the outside in the radial direction to the inside, so that the first mounting portion of the head member and the second mounting portion of the muffler member Since the surface contact is surely made, the sealing performance is further improved.

  A seal structure according to a fifth aspect of the present invention is a seal structure between a head member having a discharge port through which a compressed refrigerant is discharged and a muffler member disposed so that a muffler space is formed between the head member. The head member has a bearing hole into which the shaft member is inserted and has an annular first mounting portion in which a plurality of first fastening portions are formed, and the bearing hole from the head body. The muffler member includes a cylindrical muffler main body having an opening formed at one end of the muffler member, and an other end of the muffler main body. An annular second mounting portion formed with a plurality of second fastening portions extending and arranged to correspond to the plurality of first fastening portions, and the first fastening portion and the second fastening portion By fastening the part The first attachment portion and the second attachment portion are fixed to the head member in contact with each other, and in the first attachment portion of the head member to which the muffler member is fastened, At least some of the portions corresponding to the plurality of first fastening portions are projected to the muffler member side.

  In this seal structure, not only the fastening force between the first fastening portion of the head member and the second fastening portion of the muffler member but also at least a part of the portion corresponding to the space between the plurality of first fastening portions of the head member is on the muffler member side. By overhanging, the pressing force from the portion corresponding to the plurality of second fastening portions to the portion corresponding to the plurality of first fastening portions increases. Thereby, the sealing performance of the 1st attaching part of a head member and the 2nd attaching part of a muffler member is improved. Further, even if the area of the second attachment portion of the muffler member is reduced, the sealing performance is ensured, so that the respective outer diameters of the muffler member and the head member can be reduced. Thereby, the muffler member and the head member can be reduced in weight, and the manufacturing cost can be reduced.

  Here, “at least a part of the portion corresponding to the plurality of first fastening portions protrudes to the muffler member side” means that, for example, the plurality of first fastening portions are planar, When the contact surface with 2 fastening parts exists on the same plane, it means that it has protruded to the muffler member side from the same plane.

  A seal structure according to a sixth aspect of the present invention is the seal structure according to the fifth aspect of the present invention, wherein all of the portions corresponding to the two adjacent first fastening portions project to the muffler member side. It is said.

  In this seal structure, the pressing force from all of the portions corresponding to the two adjacent second fastening portions to the portion corresponding to the two adjacent first fastening portions is increased, so that the first mounting of the head member is performed. The sealing performance between the portion and the second mounting portion of the muffler member is further improved. Further, since the portion where the force on the first mounting portion of the head member is locally weak from the mounting portion of the muffler member is eliminated, it is possible to suppress the head member from being partially distorted. Therefore, it is possible to suppress the formation of a gap between the first attachment portion of the head member and the second attachment portion of the muffler member. Thereby, since the clearance setting in the compression chamber can be reduced, the performance of the compressor is improved and the reliability is also improved.

  A seal structure according to a seventh aspect is the seal structure according to the sixth aspect, characterized in that the amount of protrusion at the center of the portion corresponding to the space between the two adjacent first fastening portions is the largest. .

  In this seal structure, by increasing the pressing force of the central portion where the pressing force is weak because it is farthest from the second fastening portion between two adjacent second fastening portions, the first mounting portion of the head member and the muffler member It is possible to prevent a gap from being formed between the second mounting portion and the sealing performance is further improved.

  A seal structure according to an eighth invention is the seal structure according to the sixth or seventh invention, wherein a protruding amount of the portion corresponding to the space between the two adjacent first fastening portions increases toward the outside. It is characterized by having a tapered shape.

  In this seal structure, when the second attachment portion of the muffler member is fixed to the first attachment portion of the head member, the portion corresponding to the interval between the two adjacent second fastening portions is based on the other end of the muffler body. The pressing force is further increased by the addition of a repulsive force caused by bending toward the muffler body. Thereby, the sealing performance between the first attachment portion of the head member and the second attachment portion of the muffler member is further improved. In addition, a portion corresponding to between the two adjacent second fastening portions is surely in contact from the outside in the radial direction to the inside, so that the first mounting portion of the head member and the second mounting portion of the muffler member Since the surface contact is surely made, the sealing performance is further improved.

  A compressor according to a ninth aspect is characterized by including the seal structure according to any one of the first to eighth aspects.

  In this compressor, as described above, the sealing performance between the muffler member and the head member is improved.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, not only the fastening force between the first fastening portion of the head member and the second fastening portion of the muffler member, but also at least part of the portion corresponding to the space between the plurality of second fastening portions of the muffler member is the muffler body. By projecting to the opposite side, the pressing force from the portion corresponding to the plurality of second fastening portions to the portion corresponding to the plurality of first fastening portions increases. Thereby, the sealing performance of the 1st attaching part of a head member and the 2nd attaching part of a muffler member is improved. Further, even if the area of the second attachment portion of the muffler member is reduced, the sealing performance is ensured, so that the respective outer diameters of the muffler member and the head member can be reduced. Thereby, the muffler member and the head member can be reduced in weight, and the manufacturing cost can be reduced.

  In the second invention, the pressing force from all of the portions corresponding to the two adjacent second fastening portions to the portion corresponding to the two adjacent first fastening portions is increased, so that the first of the head member is increased. The sealing performance between the mounting portion and the second mounting portion of the muffler member is further improved. Moreover, since the part where the force with respect to the 1st attaching part of a head member is weak locally from the 2nd attaching part of a muffler member disappears, it can suppress that a head member is distorted partially. Accordingly, since it is possible to suppress the formation of a gap between the first mounting portion of the head member and the second mounting portion of the muffler member, the performance of the compressor is improved and the reliability is also improved. .

  In the third invention, the first mounting portion of the head member and the muffler member are increased by increasing the pressing force of the central portion where the pressing force is weak because it is farthest from the second fastening portion between two adjacent second fastening portions. It is possible to prevent a gap from being formed between the second mounting portion and the sealing performance.

  In the fourth invention, when the second attachment portion of the muffler member is fixed to the first attachment portion of the head member, the portion corresponding to the interval between the two adjacent second fastening portions is based on the other end of the muffler body. As a result, the pressing force is further increased by the addition of a repulsive force caused by bending toward the muffler body. Thereby, the sealing performance between the first attachment portion of the head member and the second attachment portion of the muffler member is further improved. In addition, a portion corresponding to between the two adjacent second fastening portions is surely in contact from the outside in the radial direction to the inside, so that the first mounting portion of the head member and the second mounting portion of the muffler member Since the surface contact is surely made, the sealing performance is further improved.

  In the fifth invention, not only the fastening force between the first fastening portion of the head member and the second fastening portion of the muffler member, but also at least part of the portion corresponding to the space between the plurality of first fastening portions of the head member is the muffler member. By projecting to the side, the pressing force from the portion corresponding to the plurality of second fastening portions to the portion corresponding to the plurality of first fastening portions is increased. Thereby, the sealing performance of the 1st attaching part of a head member and the 2nd attaching part of a muffler member is improved. Further, even if the area of the second attachment portion of the muffler member is reduced, the sealing performance is ensured, so that the respective outer diameters of the muffler member and the head member can be reduced. Thereby, the muffler member and the head member can be reduced in weight, and the manufacturing cost can be reduced.

  In the sixth aspect of the invention, the pressing force from all of the portions corresponding to the two adjacent second fastening portions to the portion corresponding to the two adjacent first fastening portions is increased, whereby the first of the head member The sealing performance between the mounting portion and the second mounting portion of the muffler member is further improved. Further, since the portion where the force on the first mounting portion of the head member is locally weak from the mounting portion of the muffler member is eliminated, it is possible to suppress the head member from being partially distorted. Therefore, it is possible to suppress the formation of a gap between the first attachment portion of the head member and the second attachment portion of the muffler member. Thereby, since the clearance setting in the compression chamber can be reduced, the performance of the compressor is improved and the reliability is also improved.

  In the seventh invention, the first mounting portion of the head member and the muffler member are increased by increasing the pressing force of the central portion where the pressing force is weak because it is farthest from the second fastening portion between two adjacent second fastening portions. It is possible to prevent a gap from being formed between the second mounting portion and the sealing performance.

  In the eighth invention, when the second mounting portion of the muffler member is fixed to the first mounting portion of the head member, the portion corresponding to the interval between the two adjacent second fastening portions has the other end of the muffler body as a fulcrum. As a result, the pressing force is further increased by the addition of a repulsive force caused by bending toward the muffler body. Thereby, the sealing performance between the first attachment portion of the head member and the second attachment portion of the muffler member is further improved. In addition, a portion corresponding to between the two adjacent second fastening portions is surely in contact from the outside in the radial direction to the inside, so that the first mounting portion of the head member and the second mounting portion of the muffler member Since the surface contact is surely made, the sealing performance is further improved.

  In the compressor according to the ninth aspect, as described above, the sealing performance between the muffler member and the head member is improved.

  Hereinafter, an embodiment of a compressor provided with a seal structure according to the present invention will be described based on the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view of a rotary compressor and accumulator according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a drive mechanism and a compression mechanism of the rotary compressor shown in FIG. 3A and 3B are diagrams illustrating the front muffler. FIG. 3A is a plan view and FIG. 3B is a front view. 4A and 4B are diagrams for explaining the front head. FIG. 4A is a plan view and FIG. 4B is a front view. Hereinafter, with reference to FIGS. 1-4, the rotary compressor 1 which concerns on 1st Embodiment is demonstrated in detail.

  As shown in FIGS. 1 and 2, the rotary compressor 1 includes a sealed casing 10, and a drive mechanism 20 and a compression mechanism 30 disposed in the sealed casing 10. The rotary compressor 1 is a so-called high-pressure dome type compressor, and a compression mechanism 30 is disposed below the drive mechanism 20 in the sealed casing 10. In addition, lubricating oil 40 supplied to each sliding portion of the compression mechanism 30 is stored in the lower portion of the hermetic casing 10.

  The drive mechanism 20 is provided to drive the compression mechanism 30 and includes a motor 21 serving as a drive source and a shaft 22 attached to the motor 21.

  The motor 21 includes a rotor 21a and a stator 21b disposed on the radially outer side of the rotor 21a via an air gap. A shaft 22 is rotatably attached to the rotor 21a. And the rotor 21a has the rotor main body which consists of a laminated | stacked electromagnetic steel plate, and the magnet embed | buried under this rotor main body. The stator 21b has a stator main body made of iron and a coil wound around the stator main body. The motor 21 rotates the rotor 21 a together with the shaft 22 by electromagnetic force generated in the stator 21 b by passing an electric current through the coil.

  The shaft 22 rotates with the rotor 21a described above to rotate the rollers 34 and 37 of the compression mechanism 30. The shaft 22 is provided with an eccentric portion 22a so as to be positioned in a cylinder chamber B1 of the front cylinder 33 described later, and is provided with an eccentric portion 22b so as to be positioned in a cylinder chamber B2 of the rear cylinder 36. . Rollers 34 and 37 are attached to these eccentric portions 22a and 22b, respectively. Accordingly, as the shaft 22 rotates, the roller 34 attached to the eccentric portion 22a rotates in the cylinder chamber B1, and the roller 37 attached to the eccentric portion 22b rotates in the cylinder chamber B2. The eccentric portion 22a and the eccentric portion 22b are disposed at positions shifted by 180 ° in the rotation direction of the shaft 22.

  On the other hand, the compression mechanism 30 is provided to compress and discharge the refrigerant sucked from the accumulator 2. The refrigerant discharged by the compression mechanism 30 passes through the air gap between the stator 21b and the rotor 21a of the drive mechanism 20, cools the drive mechanism 20, and is then discharged from the discharge pipe 11. The compression mechanism 30 includes a front muffler (muffler member) 31, a front head (head member) 32, a front cylinder 33 and a roller 34, from top to bottom along the rotation axis of the shaft 22 of the drive mechanism 20. Middle plate 35, rear cylinder 36 and roller 37, rear head 38, and rear muffler 39 are provided.

  The front muffler 31 forms a muffler space A1 between the front head 32 and the noise due to the refrigerant discharge. The front muffler 31 is attached so as to cover the recess 32A of the front head 32. As shown in FIGS. 2 and 3, the front muffler 31 includes a cylindrical muffler main body 31b in which an opening 31a into which a bearing portion 32d of a front head 32 to be described later is inserted is formed at one end, and the muffler main body 31b. And an annular second mounting portion 31c extending from the end. The second attachment portion 31c has a second fastening portion 31d. When the second fastening portion 31d and two first fastening portions 32e described later are fastened, the first attachment portion of the front head 32 is provided. It is fixed to 32b. Two adjacent second fastening portions 31d have through holes 31e through which the bolts 41 are inserted. In the front muffler 31 of the present embodiment, as shown in FIG. 3B, the two second fastening portions 31d have a substantially planar shape, and the contact surfaces with the two first fastening portions 32e are on the same plane. It is in. And all the parts corresponding between the two adjacent 2nd fastening parts 31d are projected on the opposite side to the muffler main body 31b from the same plane. Further, the portion corresponding to the distance between the two adjacent second fastening portions 31d has the largest amount of protrusion at the center. In addition, the part corresponding between two adjacent 2nd fastening parts 31d is comprised in the horizontal shape where the overhang | projection amount is uniform toward the outer side. Then, the bolt 41 that fixes the front muffler 31 is fastened to the screw hole of the front cylinder 33 through the through hole 31 e and the fastening hole 32 f formed in the front head 32. Further, the front muffler 31 is formed with a discharge hole 31f through which the compressed refrigerant is discharged from the muffler space A1.

  The front head 32 is disposed on the upper side of the front cylinder 33 and closes an opening above the cylinder chamber B1 of the front cylinder 33. As shown in FIGS. 2 and 4, the front head 32 includes a head body 32c having a bearing hole 32a into which the shaft 22 is inserted and an annular first mounting portion 32b, and a head body so as to surround the bearing hole 32a. And an annular bearing portion 32d protruding from 32c. The first attachment portion 32b has two first fastening portions 32e. The two first fastening portions 32e are arranged so as to correspond to the two second fastening portions 31d. As shown in FIG. 4B, the front head 32 of the present embodiment has a first mounting portion 32b formed in a substantially planar shape. The front head 32 is provided with a discharge port 32g through which the refrigerant compressed by the rotational drive of the roller 34 in the cylinder chamber B1 of the front cylinder 33 is discharged. The refrigerant discharged from the discharge port 32g is discharged from a discharge hole 31f formed in the front muffler 31 through the muffler space A1. The front head 32 is provided with a discharge valve (not shown) that opens and closes the outlet of the discharge port 32g.

  The front cylinder 33 is provided with a cylinder chamber B1 in which a roller 34 that moves eccentrically with the rotation of the shaft 22 is disposed. The cylinder chamber B1 and the muffler space A1 are communicated with each other via the discharge port (not shown). Therefore, the refrigerant compressed by the eccentric motion of the roller 34 attached to the eccentric portion 22a of the shaft 22 is guided from the cylinder chamber B1 to the muffler space A1 through the discharge port.

  The middle plate 35 is disposed between the front cylinder 33 and the rear cylinder 36. Then, the opening below the cylinder chamber B1 of the front cylinder 33 is closed, and the opening above the cylinder chamber B2 of the rear cylinder 36 is closed.

  The rear cylinder 36 is provided with a cylinder chamber B <b> 2 in which a roller 37 that moves eccentrically with the rotation of the shaft 22 is disposed. The cylinder chamber B2 and a muffler space A2 described later are communicated with each other via a discharge port (not shown). Therefore, the refrigerant compressed by the eccentric movement of the roller 37 attached to the eccentric portion 22b of the shaft 22 is guided from the cylinder chamber B2 to the muffler space A2 through the discharge port.

  The rear head 38 is disposed below the rear cylinder 36 and closes the opening below the cylinder chamber B2 of the rear cylinder 36. The rear head 38 has a bearing hole 38a into which the shaft 22 is inserted. The rear head 38 is provided with a discharge port (not shown) through which the refrigerant compressed by the rotational drive of the roller 37 in the cylinder chamber B2 of the rear cylinder 36 is discharged. The refrigerant discharged from the discharge port is discharged from a discharge hole (not shown) formed in the rear muffler 39 through a muffler space A2 described later. The rear head 38 is attached with a discharge valve (not shown) that opens and closes the outlet of the discharge port. The rear head 38 is provided with a plurality of fastening holes 38b through which the bolts 42 can pass.

  The muffler space A2 is formed between the rear muffler 39 and the rear head 38 to reduce noise associated with refrigerant discharge. The rear muffler 39 is provided with a plurality of through holes (not shown) provided at positions corresponding to the plurality of fastening holes 38b of the rear head 38 and an opening 39a into which the shaft 22 is inserted. The rear muffler 39 is formed with a discharge hole (not shown) through which the compressed refrigerant is discharged from the muffler space A2. The two bolts 42 are tightened in the screw holes of the front cylinder 33 through the two through holes formed in the rear muffler 39, the rear head 38, and the middle plate 37, so that the rear muffler 39 is in contact with the rear head 38. Is fixed.

  Next, the above-described seal structure 50 between the front muffler 31 and the front head 32 will be described with reference to FIG. FIG. 5 is a schematic view showing a seal structure of the rotary compressor according to the first embodiment of the present invention.

  The seal structure 50 between the front muffler 31 and the front head 32 is configured by fixing the second mounting portion 31 c of the front muffler 31 to the first mounting portion 32 b of the front head 32. Specifically, the front muffler 31 is fixed to the front head 32 by fastening the first fastening portion 32e of the front head 32 and the second fastening portion 31d of the front muffler 31 with two bolts 41. The At this time, as shown in FIG. 5A, the portion corresponding to the space between the two adjacent second fastening portions 31d is located on the first mounting portion 32b of the front head 32 before the two second fastening portions 31d. Abut. In the front muffler 31 of the present embodiment, the first mounting portion 32b of the front head 32 comes into contact with a portion corresponding to the space between two adjacent second fastening portions 31d having the largest overhang amount. And when the 2nd fastening part 31d of the front muffler 31 approaches the 1st fastening part 32e of the front head 32, as shown in FIG.5 (b), the part corresponding between two adjacent 2nd fastening parts 31d will be shown. A pressing force is generated against the first mounting portion 32b of the front head 32 by bending toward the muffler body 31b. Accordingly, as shown in FIG. 5C, when the first fastening portion 32 e and the second fastening portion 31 d are fastened by the bolt 41, the first mounting portion 32 b of the front head 32 and the second muffler 31 of the front muffler 31. The attachment portion 31c is not only the fastening force between the first fastening portion 32e and the second fastening portion 31d, but the pressing force increases in all of the portions corresponding to the two adjacent second fastening portions 31d. Since it is farthest from the second fastening portion 31d between the two adjacent second fastening portions 31d, the pressing force at the central portion where the pressing force is weak becomes large and comes into firm contact.

[Characteristics of Seal Structure of First Embodiment]
The seal structure 50 of the first embodiment has the following features.

  In the seal structure 50 of the present embodiment, not only the fastening force between the first fastening portion 32e of the front head 32 and the second fastening portion 31d of the front muffler 31, but also between the plurality of second fastening portions 31d of the front muffler 31 is supported. Since at least a part of the projecting portion projects to the opposite side to the muffler body 31b, the pressing force from the portion corresponding to the plurality of second fastening portions 31d to the portion corresponding to the plurality of first fastening portions 32e is increased. growing. Thereby, the sealing performance between the first mounting portion 32b of the front head 32 and the second mounting portion 31c of the front muffler 31 is improved. Further, even if the area of the second mounting portion 31c of the front muffler 31 is reduced, the sealing performance is ensured, so that the outer diameters of the front muffler 31 and the front head 32 can be reduced. Thus, the front muffler 31 and the front head 32 can be reduced in weight, and the manufacturing cost can be reduced.

  Further, the pressing force from all of the portions corresponding to the two adjacent second fastening portions 31d to the portion corresponding to the two adjacent first fastening portions 32e is increased, whereby the first mounting of the front head 32 is performed. The sealing performance between the portion 32b and the second mounting portion 31c of the front muffler 31 is further improved. Further, since the portion where the force from the second mounting portion 31c of the front muffler 31 to the first mounting portion 32b of the front head 32 is locally weak is eliminated, it is possible to suppress the front head 32 from being partially distorted. Therefore, since it is possible to suppress the formation of a gap between the first mounting portion 32b of the front head 32 and the second mounting portion 31c of the front muffler 31, the performance of the compressor 1 is improved and the reliability is improved. Is also improved.

  Further, the first mounting portion 32b of the front head 32 and the front muffler are increased by increasing the pressing force at the central portion where the pressing force is weak because it is farthest from the second fastening portion 31d between the two adjacent second fastening portions 31d. It is possible to prevent a gap from being formed between the second mounting portion 31c and the sealing performance.

  Further, when the second mounting portion 31c of the front muffler 31 is fixed to the first mounting portion 32b of the front head 32, the portion corresponding to the space between the two adjacent second fastening portions 31d is the other end of the muffler body 31b. A pressing force is further increased by applying a repulsive force by bending the muffler body 31b as a fulcrum. Thereby, the sealing performance between the first mounting portion 32b of the front head 32 and the second mounting portion 31c of the front muffler 31 is further improved. In addition, a portion corresponding to between the two adjacent second fastening portions 31d is surely in contact from the outside in the radial direction to the inside, so that the first mounting portion 32b of the front head 32 and the first muffler 31 of the front muffler 31 are in contact with each other. 2 Since the mounting portion 31c is in surface contact with each other, the sealing performance is further improved.

(Second Embodiment)
6A and 6B are diagrams illustrating the front muffler. FIG. 6A is a plan view and FIG. 6B is a front view. 7A and 7B are diagrams for explaining the front head. FIG. 7A is a plan view and FIG. 7B is a front view. FIG. 8 is a schematic view showing a seal structure of a rotary compressor according to the second embodiment of the present invention. In the second embodiment, unlike the first embodiment in which the portion corresponding to the two adjacent second fastening portions protrudes to the opposite side of the muffler body, the portion corresponds to the two adjacent first fastening portions. This part is configured to project to the front muffler side. Since the second embodiment is the same as the first embodiment except for the configuration of the front head and the front muffler, the same reference numerals as those in the first embodiment are used and description thereof is omitted.

  The front muffler 131 forms a muffler space A1 with the front head 132 to reduce noise associated with refrigerant discharge. The front muffler 131 is attached so as to cover the recess 32A of the front head 132. As shown in FIG. 6, the front muffler 131 includes a cylindrical muffler main body 131b in which an opening 131a into which a bearing portion 132d of a front head 132 (to be described later) is inserted is formed at one end, and extends from the other end of the muffler main body 131b. And an annular second mounting portion 131c. The second attachment portion 131c has two second fastening portions 131d. When the second fastening portion 131d and two first fastening portions 132e described later are fastened, the first mounting portion 131c of the front head 132 is provided. It is fixed to the attachment part 132b. The two second fastening portions 131d have through holes 131e through which the bolts 141 are inserted. As shown in FIG. 6B, the front muffler 131 of the present embodiment has a second mounting portion 131c formed in a substantially planar shape. Then, the bolt 141 that fixes the front muffler 131 is fastened to the screw hole of the front cylinder 33 via the through hole 131e and the fastening hole 132f formed in the front head 132. Further, the front muffler 131 is formed with a discharge hole 131f through which the compressed refrigerant is discharged from the muffler space A1.

  The front head 132 is disposed on the upper side of the front cylinder 33, and closes the opening above the cylinder chamber B1 of the front cylinder 33. As shown in FIG. 7, the front head 132 protrudes from the head main body 132c so as to surround the head main body 132c having a bearing hole 132a into which the shaft 22 is inserted and an annular first mounting portion 132b, and the bearing hole 132a. And an annular bearing portion 132d. The first attachment portion 132b has two first fastening portions 132e. The two first fastening portions 132e are arranged so as to correspond to the two second fastening portions 131d. In the front head 132 of the present embodiment, as shown in FIG. 7B, the two first fastening portions 132e have a substantially planar shape, and the contact surfaces with the two second fastening portions 131d are on the same plane. It is in. All of the portions corresponding to the two adjacent first fastening portions 132e project from the same plane to the front muffler 131 side. Further, the portion corresponding to the distance between the two adjacent first fastening portions 132e has the largest amount of protrusion at the center. In addition, the part corresponding between two adjacent 1st fastening parts 132e is comprised in the horizontal shape where the overhang | projection amount is uniform toward the outer side. The front head 132 is provided with a discharge port 132g through which the refrigerant compressed by the rotational drive of the roller 34 in the cylinder chamber B1 of the front cylinder 33 is discharged. The refrigerant discharged from the discharge port 132g is discharged from a discharge hole 131f formed in the front muffler 131 via the muffler space A1. Further, a discharge valve (not shown) for opening and closing the outlet of the discharge port 132g is attached to the front head 132.

  The above-described seal structure 150 between the front muffler 131 and the front head 132 is configured by fixing the second mounting portion 131c of the front muffler 131 to the first mounting portion 132b of the front head 132. . Specifically, the two first fastening portions 132e of the front head 132 and the two second fastening portions 131d of the front muffler 131 are fastened by two bolts 141, whereby the front muffler is connected to the front head 132. 131 is fixed. At this time, as shown in FIG. 8A, a portion corresponding to the interval between the two adjacent second fastening portions 131d is formed on the first mounting portion 132b of the front head 132 before the two second fastening portions 131d. Abut. In the front muffler 131 of the present embodiment, the first mounting portion 132b of the front head 132 is brought into contact with a portion corresponding to the space between two adjacent second fastening portions 131d having the largest overhang amount. And when the 2nd fastening part 131d of the front muffler 131 approaches the 1st fastening part 132e of the front head 132, the part corresponding between two adjacent 2nd fastening parts 131d is as shown in FIG.8 (b). By bending to the muffler main body 131b side, a pressing force is generated against the first mounting portion 32b of the front head 132. 8C, when the first fastening portion 132e and the second fastening portion 131d are fastened by the bolt 141, the first mounting portion 132b of the front head 132 and the second muffler 131 of the front muffler 131 are obtained. The attaching portion 131c is not only the fastening force between the first fastening portion 132e and the second fastening portion 131d, but the pressing force increases in all of the portions corresponding to the two adjacent second fastening portions 131d. Since it is farthest from the second fastening portion 131d between the two adjacent second fastening portions 131d, the pressing force at the central portion where the pressing force is weak becomes large and comes into firm contact.

  Even in the seal structure 150 of the second embodiment, the same effect as that of the seal structure 50 of the first embodiment described above can be obtained.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, the seal structure between the front head and the front muffler has been described. However, the present invention is not limited to this and can be applied to a seal structure between the rear head and the rear muffler.

  In the above-described embodiment, the example in which the seal structure of the front head and the front muffler is applied to the rotary compressor has been described. However, the present invention is not limited to this and can be applied to various compressors such as a scroll compressor. is there.

  Further, in the above-described embodiment, the first mounting portion of the front head and the second mounting portion of the front muffler have been described as examples having two first fastening portions and second fastening portions, respectively. However, the present invention is not limited to this, and may have three or more first fastening portions and second fastening portions.

  Further, in the first embodiment described above, the example in which all of the portions corresponding to the two adjacent second fastening portions 31d protrude to the opposite side of the muffler body 31b has been described, but the present invention is not limited thereto. Instead, at least a part of the portion corresponding to the space between the two adjacent second fastening portions 31d only has to protrude to the opposite side of the muffler body 31b.

  Further, in the above-described second embodiment, the example in which all of the portions corresponding to the two adjacent first fastening portions 132e project to the front muffler 131 side has been described, but the present invention is not limited thereto, It suffices that at least a part of the portion corresponding to between the two adjacent first fastening portions 132e protrudes toward the front muffler 131 side.

  In the above-described first embodiment, the example in which the portion corresponding to the interval between the two adjacent second fastening portions 31d is configured to have a uniform horizontal shape with the protruding amount outward is described. Not limited to this, a portion corresponding to the space between two adjacent second fastening portions 231d, such as a front muffler 231 according to a modification of the first embodiment shown in FIG. It may be configured in a tapered shape. In this case, when the second mounting portion 231c of the front muffler 231 is fixed to the first mounting portion 32b of the front head 32, the portion corresponding to the interval between the two adjacent second fastening portions 31d is the other end of the muffler body 231b. As a repulsive force is applied by bending toward the muffler main body 231b with fulcrum as a fulcrum, the pressing force is further increased. Thereby, the sealing performance between the first mounting portion 32b of the front head 32 and the second mounting portion 231c of the front muffler 231 is further improved. In addition, a portion corresponding to the interval between the two adjacent second fastening portions 231d is surely in contact from the outside in the radial direction to the inside, so that the first mounting portion 32b of the front head 32 and the first muffler 231 2 Since the mounting portion 231c is in surface contact with each other, the sealing performance is further improved.

  Further, in the above-described second embodiment, the example in which the portion corresponding to the interval between the two adjacent first fastening portions 132e is configured to have a uniform horizontal shape toward the outside is described. This is not limiting, and a portion corresponding to the space between two adjacent first fastening portions 232e, such as the front head 232 according to the modification of the second embodiment shown in FIG. It may be configured in a tapered shape. In this case, when the second mounting portion 131c of the front muffler 131 is fixed to the first mounting portion 232b of the front head 232, the portion corresponding to the space between the two adjacent second fastening portions 131d is the other end of the muffler body 131b. As a repulsive force is applied by bending toward the muffler body 131b with fulcrum as a fulcrum, the pressing force is further increased. Thereby, the sealing performance between the first mounting portion 232b of the front head 231 and the second mounting portion 131c of the front muffler 131 is further improved. In addition, a portion corresponding to between the two adjacent second fastening portions 131d comes into reliable contact from the outside in the radial direction to the inside, so that the first mounting portion 232b of the front head 231 and the first muffler 131 of the front muffler 131 are in contact with each other. 2 Since the mounting part 131c is in surface contact with each other, the sealing performance is further improved.

  By utilizing the present invention, the sealing performance between the muffler member and the head member of the compressor can be improved.

It is sectional drawing of the rotary compressor and accumulator which concern on 1st Embodiment of this invention. It is sectional drawing which showed the drive mechanism and compression mechanism of the rotary compressor shown in FIG. It is a figure explaining a front muffler, Drawing 3 (a) is a top view and Drawing 3 (b) is a front view. It is a figure explaining a front head, Fig.4 (a) is a top view, FIG.4 (b) is a front view. It is the schematic diagram which showed the seal structure of the rotary compressor which concerns on 1st Embodiment of this invention. It is a figure explaining a front muffler, Drawing 6 (a) is a top view and Drawing 6 (b) is a front view. It is a figure explaining a front head, Fig.7 (a) is a top view, FIG.7 (b) is a front view. It is the schematic diagram which showed the seal structure of the rotary compressor which concerns on 2nd Embodiment of this invention. It is a figure explaining the front muffler which concerns on the modification of 1st Embodiment, Fig.9 (a) is a top view, FIG.9 (b) is sectional drawing in the AA of Fig.9 (a). It is a figure explaining the front head concerning the modification of 2nd Embodiment, Fig.10 (a) is a top view, FIG.10 (b) is sectional drawing in the BB line of Fig.10 (a). It is the figure which showed the seal structure of the head member and muffler member of the compressor which concerns on a prior art example, FIG. 11 (a) is sectional drawing, FIG.11 (b) is a top view. It is the figure which showed the sealing structure of the head member and muffler member of the compressor which concerns on an example of the past, FIG. 12 (a) is sectional drawing, FIG.12 (b) is a top view.

Explanation of symbols

1 Rotary compressor (compressor)
22 Shaft (shaft member)
31,131 Front muffler (muffler member)
31a, 131a Opening 31b, 131b Muffler body 31c, 131c Second mounting portion 31d, 131d Second fastening portion 32, 132 Front head (head member)
32a, 132a Bearing hole 32b, 132b First mounting portion 32c, 132c Head body 32d, 132d Bearing portion 32e, 132e First fastening portion 32g, 132g Discharge port 50, 150 Seal structure A1 Muffler space

Claims (9)

A head member (32) having a discharge port (32g) through which the compressed refrigerant is discharged, and a muffler member (31) disposed so as to form a muffler space (A1) between the head member. A seal structure (50),
The head member is
A head body (32c) having a bearing hole (32a) into which the shaft member (22) is inserted and having an annular first mounting portion (32b) formed with a plurality of first fastening portions (32e);
An annular bearing portion (32d) protruding from the head body so as to surround the bearing hole;
The muffler member is
A cylindrical muffler main body (31b) having an opening (31a) into which the bearing portion is inserted and formed at one end;
An annular second attachment portion (31c) extending from the other end of the muffler body and having a plurality of second fastening portions (31d) arranged to correspond to the plurality of first fastening portions. Have
The first fastening part and the second fastening part are fastened to be fixed to the head member in a state where the first mounting part and the second mounting part are in contact with each other,
In the second mounting portion of the muffler member before being fastened to the head member, at least a part of a portion corresponding to the space between the plurality of second fastening portions protrudes to the opposite side of the muffler body. Characteristic seal structure.   2. The seal structure according to claim 1, wherein all of the portions corresponding to the two adjacent second fastening portions project to the opposite side of the muffler body.   3. The seal structure according to claim 2, wherein a protruding amount of a central portion of a portion corresponding to between the two adjacent second fastening portions is the largest.   4. The seal structure according to claim 2, wherein a portion corresponding to the interval between the two adjacent second fastening portions is configured in a tapered shape in which a protruding amount increases toward the outside. A head member (132) having a discharge port (132g) through which the compressed refrigerant is discharged, and a muffler member (131) arranged so as to form a muffler space (A1) between the head member. A seal structure (150),
The head member is
A head body (132c) having a bearing hole (132a) into which the shaft member (22) is inserted and having an annular first mounting portion (132b) in which a plurality of first fastening portions (132e) are formed;
An annular bearing portion (132d) protruding from the head body so as to surround the bearing hole;
The muffler member is
A cylindrical muffler main body (131b) having an opening (131a) into which the bearing portion is inserted and formed at one end;
An annular second mounting portion (131c) extending from the other end of the muffler body and having a plurality of second fastening portions (131d) disposed so as to correspond to the plurality of first fastening portions. Have
The first fastening part and the second fastening part are fastened to be fixed to the head member in a state where the first mounting part and the second mounting part are in contact with each other,
In the first attachment portion of the head member to which the muffler member is fastened, at least a part of a portion corresponding to the space between the plurality of first fastening portions protrudes to the muffler member side. Construction.   6. The seal structure according to claim 5, wherein all of the portions corresponding to the two adjacent first fastening portions protrude toward the muffler member.   The seal structure according to claim 6, wherein a protruding amount of a central portion of a portion corresponding to between the two adjacent first fastening portions is the largest.   8. The seal structure according to claim 6, wherein a portion corresponding to between the two adjacent first fastening portions is configured in a tapered shape in which a protruding amount increases toward the outside.   The compressor provided with the seal structure of any one of Claims 1-8.

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