JP5028309B2 - Positioning and fixing method, rotary compressor manufacturing method, bolt fastening device, and rotary compressor - Google Patents

Description

  The present invention relates to a positioning and fixing method for positioning and fixing three or more superposed members, a method for manufacturing a rotary compressor using the positioning and fixing method, a bolt fastening device, and a rotary compressor.

  As a compressor using a conventional positioning and fixing method, in order to suppress the distortion of the cylinder due to bolt fastening, a screw part is provided in the bearing part (main bearing part), and the cylinder, the lower bearing (sub bearing part) and the discharge muffler are provided. Some bolt holes are provided, and bolts are passed through these bolt holes and collectively fixed to the upper bearing by bolting (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 58-44290 (first page, FIG. 1)

  In the prior art as described above, it is necessary to fix the position of three or more members of the main bearing, the cylinder, and the auxiliary bearing with the bolts at the same time, and it is necessary to increase the complexity of the assembling apparatus and the external accuracy of the members. There was a problem. Further, even when positioning two members at a time, there is a need for a temporary fixing hole for fixing, and there is a problem that a processing cost is increased due to the additional hole processing and a hole space must be secured.

  This invention has been made to solve the above-mentioned problems of the prior art, and it is not necessary to use a complicated device, and it is not necessary to provide a temporary fastening hole other than a fastening hole for permanent fastening. An object of the present invention is to provide a positioning and fixing method capable of easily positioning and fixing three or more members, a manufacturing method of a rotary compressor using the positioning and fixing method, a bolt fastening device, and a rotary compressor.

In the positioning and fixing method according to the present invention, the first and second members arranged at both ends are superposed via intermediate members that need to be positioned together with the first and second members. a method for positioning and fixing the respective members together by a plurality of bolts inserted through the plurality of fastening holes through the members in the polymerization direction, the fastening hole and said either one member of said first and second members In the fastening hole of the intermediate member, a female thread part having the same thread size is provided so that the female thread parts are spaced apart from each other by a predetermined dimension during polymerization, while the bolt has a male thread part that engages with the female thread part only at the tip part. Then, between the male screw portion and the head, a plurality of temporary fixing bolts and permanent fixing bolts having a predetermined length having a shaft portion with an outer diameter that can pass through the female screw portion, the first member and the Position intermediate member Then, the process of fastening with a plurality of temporary fixing bolts, positioning the second member with respect to the intermediate member, removing one of the temporary fixing bolts from one of the plurality of fastening holes, Including a step of replacing the temporary fixing bolt with the final fixing bolt by sequentially repeating the operation of inserting the final fixing bolt into the removed fastening hole and fastening the intermediate member between the first and second members. It is what I did.

The rotary compressor manufacturing method according to the present invention is the above-described positioning and fixing method, wherein the first member is a main bearing, the intermediate member is a cylinder, and the second member is a sub-bearing. Used for positioning and fixing of bearings.
The bolt fastening device according to the present invention is superposed between the first and second members disposed at both ends via an intermediate member that needs to be positioned together with the first and second members. In the bolt fastening device in which each of these members is positioned and fixed by a plurality of bolts inserted through a plurality of fastening holes penetrating these members in the overlapping direction, either one of the first and second members This fastening hole is provided with a main screw part for fastening, and the fastening hole of the intermediate member is screwed in the same screw size so as to be spaced apart from the main fastening part by a predetermined dimension in the axial direction during polymerization. A female screw portion for temporary fixing is provided, and has a male screw portion that is screwed into the female screw portion only at the tip portion, and a shaft portion having an outer diameter that can pass through the female screw portion is provided between the male screw portion and the head. A plurality of bolts for a predetermined length having a predetermined length Therefore, those in which the intermediate member is formed by fastening so as to be sandwiched by the first and second members above.
In the rotary compressor according to the present invention, in the bolt fastening device, the first member is a main bearing, the second member is a sub-bearing, and the intermediate member is a cylinder. The bearing is provided with a compression mechanism portion positioned and fixed by the main fastening bolt.

According to the positioning and fixing method of the present invention, in order to position three or more members by sequentially repeating the operation of positioning and temporarily fixing two members adjacent to each other in the overlapping direction using the fastening holes for permanent fixing, Three or more members can be easily positioned and fixed without separately providing temporary fixing holes and without simultaneously positioning the three or more members.
Further, according to the method for manufacturing a rotary compressor of the present invention, since the positioning and fixing method of the present invention is used for assembling the cylinder, the main bearing, and the sub bearing of the rotary compressor, the cylinder, the main bearing, and the sub bearing Positioning and fixing of the three members of the bearing are facilitated, and further, since it is not necessary to provide a temporary fixing hole, the machining process can be reduced and the cost can be reduced.
Further, according to the bolt fastening device of the present invention, since three or more members can be positioned and fixed using the fastening holes for final fastening, the temporary fastening holes can be formed by limiting the screw hole space. Even small members that cannot be increased can be positioned and fixed easily.
Further, according to the rotary compressor of the present invention, when assembling the compressor, even if the temporary fixing holes cannot be increased due to the limitation of the screw hole space or the like, only the final fixing holes are provided without newly providing temporary fixing holes. Thus, the temporary fixing and the final fixing can be performed, so that the manufacturing is easy and inexpensive. Furthermore, since the cylinder is fastened together with the main bearing and the sub-bearing without being fixed at the threaded portion provided on the cylinder, even if the female threaded portion of the main bearing is distorted in the container radial direction due to the tightening force. Since the distortion due to fastening does not affect the cylinder, it is possible to suppress a reduction in the efficiency of the compressor due to the distortion of the cylinder.

Embodiment 1 FIG.
1 to 3 are diagrams for explaining a positioning and fixing method, a rotary compressor manufacturing method, a bolt fastening device, and a rotary compressor according to Embodiment 1 of the present invention, and FIG. 1 schematically shows the rotary compressor. FIG. 2 is a diagram schematically showing the main part of the rotary compressor shown in FIG. 1, (a) is a sectional view showing a positioning and fixing state with a main bolt, and (b) is a diagram showing FIG. 3 is a cross-sectional view illustrating a state in which the main fastening bolt is removed together with the shape of the main fastening bolt, and FIG. 3 is a cross-sectional view illustrating a method for positioning and fixing each member constituting the rotary compressor shown in FIG. . Note that the same reference numerals denote the same or corresponding parts throughout the drawings. In the figure, the rotary compressor 1 includes an electric motor unit 2 and a compression mechanism unit 3 housed in a hermetic container 10. The compression mechanism unit 3 is superposed so as to be sandwiched between the main shaft 21 that also serves as the rotating shaft of the motor unit 2, the main bearing (first member) 31, the sub-bearing (second member) 32, and the main bearing 31 and the sub-bearing 32. A cylinder 33, a roller 30 and the like are provided as intermediate members. The main shaft 21 has an eccentric portion 21a. When the main shaft 21 is rotated by the electric motor unit 2, the roller 30 in the cylinder 33 revolves, and a compression operation of a gas such as a refrigerant is performed. Since it is the same as the known prior art, illustration and detailed description are omitted together with a detailed structure such as a valve mechanism of the compression mechanism unit 3.

  In the compression mechanism section 3 of the rotary compressor 1 as described above, as shown in FIG. 2, the cylinder (intermediate member) 33 includes a main bearing (first member) 31 superposed on the upper side of the figure, and the figure. Circles arranged between the sub-bearings (second members) 32 superposed on the lower side, positioned so that the axes O coincide with each other, and penetrated in the superposition direction (vertical direction in the figure) A plurality of fastening holes 5 provided in the circumferential direction (for convenience, the main bearing 31 part is called a fastening hole 51, the auxiliary bearing 32 part is called a fastening hole 52, and the cylinder 33 part is called a fastening hole 53. Are sandwiched between the main bearing 31 and the sub-bearing 32, and are integrally fixed. An internal thread 51 a is screwed into the fastening hole 51 of the main bearing 31. The main fastening bolt 4 has a male threaded portion 4a that is screwed into the female threaded portion 51a of the main bearing 31 only at the tip, and the space between the male threaded portion 4a and the head 4b is an outer portion that can pass through the female threaded portion 51a. A diameter shaft portion 4c (non-threaded portion) is formed.

  The fastening hole 52 of the auxiliary bearing 32 is a drilled hole portion 52a, and the drilled hole diameter is slightly larger than the valley diameter (inner diameter of the valley portion) of the female thread portion 51a of the main bearing 31, for example, The male screw part 4a of the main fastening bolt 4 can be freely passed through or can be idled. The fastening hole 53 of the cylinder 33 includes a female threaded portion 53a threaded to the same thread size as the female threaded portion 51a of the main bearing 31, and the above-described drilled hole portion 52a slightly larger than the valley diameter (inner diameter of the valley portion) of the female threaded portion 51a. A drill hole 53b having the same inner diameter is provided. The fastening hole 53 of the cylinder 33 is formed, for example, by machining a female thread having the same size as the female thread portion 51a of the main bearing 31 in the cylinder 33 and then drilling a hole to the middle of the cylinder 33 on the same axis. Can be easily formed. The female threaded portion 53a of the cylinder 33 and the female threaded portion 51a of the main bearing 31 are sufficient to allow the male threaded portion 4a of the main fastening bolt 4 to idle in the axial direction of the fastening hole 5 (vertical direction in the figure). The female threaded portion 53a of the cylinder 33 is disposed so as to be separated by a predetermined dimension, and is used for locking a temporary fastening bolt 41 (FIG. 3) described later. The temporary fixing bolt 41 is also formed with a male screw portion 41a only at the tip portion, as in the case of the main fixing bolt 4, and the overall length is shorter than the main fixing bolt 4. For example, the length of the male screw portion 41a is reduced. The length may be the same as long as it can be fastened and fastened to the female threaded portion 53a of the cylinder 33, and may be shared with the main fastening bolt 4.

  Next, refer to FIG. 3 for a method of positioning and fixing the main bearing 31 as the first member, the auxiliary bearing 32 as the second member, and the cylinder 33 as the intermediate member constituting the compression mechanism section 3 as described above. To explain. First, when assembling the two members of the main bearing 31 which is the first member and the cylinder 33 which is the intermediate member, for example, a measuring method described in known literature (specifically, in the case of patent literature, JP 3), the positional relationship between the inner diameter of the cylinder 33 and the inner diameter of the main bearing 31 is measured and positioned as shown in FIG. After the positioning, as shown in FIG. 3 (b), a temporary fixing bolt 41 having a male thread portion 41a only at the tip portion is inserted into the fastening hole 5 from the main bearing 31 side (hereinafter referred to as a bolt A). Screwed into the female threaded portion 53a of the cylinder 33, fastened with an appropriate torque and temporarily fixed. At this time, the bolt A passes through the female threaded portion 51a of the main bearing 31 while rotating, and further passes through the drilled hole 53b of the cylinder 33, and then screwed into the female threaded portion 53a. The bolt A is preferably fixed with two or more bolts A in order to securely temporarily fix and fix the main bearing 31 and the cylinder 2. In addition, although members, such as a roller which comprise a compression mechanism, are assembled | attached suitably after that, since it is a part which is not directly related to this invention, description is abbreviate | omitted.

  When the auxiliary bearing 32 as the second member is fixed to the integrated main bearing 31 and cylinder 33, for example, the main fastening bolt 4 that is longer than the bolt A is used. Then, after positioning the sub-bearing 32 with respect to the temporarily fixed body of the main bearing 31 and the cylinder 33 positioned and integrated as described above, as shown by the arrow in FIG. One of the temporary fixing bolts A is pulled out, and is indicated by an arrow in FIG. 3D while rotating the final fixing bolt 4 from the auxiliary bearing 32 side into the fastening hole 5 after the bolt A is pulled out. The threaded portion 53a of the cylinder 33 is passed through, and is threadedly engaged with the threaded portion 51a of the main bearing 31, and is fastened and fixed with an appropriate torque. Next, in order not to change the positional relationship of the main bearing 31, the cylinder 33, and the sub-bearing 32, the operation of temporarily fixing the bolts A by temporarily replacing the remaining temporarily fixed bolts A with the main-fixing bolts 4 is repeated. The cylinder 33 is sandwiched between the main bearing 31 and the sub-bearing 32 at both ends with the fixing bolt 4 and fixed (finally fixed). FIG. 3E schematically shows a state in which the main bearing 31, the cylinder 33, and the auxiliary bearing 32 are positioned and fixed by the main fastening bolts 4 inserted into the plurality of fastening holes. If positioning is ensured even if the number of the bolts A for temporary fixing is reduced by one with respect to the number of the fastening holes 5, for example, the temporary fixing is omitted only at one place and the space is freed first. After the main fastening bolt 4 is inserted into the fastening hole and the main bearing 31, the cylinder 33 and the auxiliary bearing 32 are fixed, the temporarily fastened bolts A are pulled out one by one and fastened from the opposite side with the main fastening bolt 4. The operations may be performed sequentially.

  As described above, according to the positioning and fixing method of the first embodiment, after positioning the two members of the first member (main bearing 31) and the intermediate member (cylinder 33), a plurality of bolts are inserted into the plurality of fastening holes 5. A process of inserting and temporarily fixing A, and then positioning the temporarily fixed intermediate member and the second member (sub-bearing 32), and then attaching an appropriate one of the plurality of bolts A The work of fixing the bolts 4 with the fastening bolts 4 so that the intermediate member is sandwiched between the first member and the second member is sequentially inserted by inserting the fastening bolts 4 into the fastening holes 5 of the same shaft after being pulled out. Repeatedly, including the process of replacing all bolts A with full-fixing bolts 4, three members are positioned between the first and second members by positioning two members in the overlapping direction. There is no need to perform simultaneous positioning, and a temporary fixing hole is provided separately. It is not necessary, performs temporary fixing and the sealing of the same fastening hole 5, can be fixed easily 3 members.

Further, in the manufacturing method of the rotary compressor according to the first embodiment, since the positioning and fixing method is used in the assembly process of the cylinder 33, the main bearing 31, and the auxiliary bearing 32 constituting the compression mechanism unit 3, the same fastening hole is used. 5 can fix the main bearing 31, the sub bearing 32, and the cylinder 33 by two members, so that it is possible to position two members without providing a temporary fixing hole and without positioning three members at the same time. The three members can be easily fixed.
In addition, the bolt fastening device according to the first embodiment does not require positioning of the three members at the same time, and does not require a temporary fixing hole, so that assembly is easy and inexpensive. Further, even a member that does not have a space for providing a temporary fixing hole can be easily positioned and fixed.

  Further, in the rotary compressor 1 according to the first embodiment, the assembly of the cylinder 33, the main bearing 31, and the auxiliary bearing 32 constituting the compression mechanism unit 3 uses the above positioning and fixing method. Instead of fixing with the provided female threaded portion 53a, it is positioned and fixed so that the cylinder 33 is sandwiched between the main bearing 31 and the sub-bearing 32 disposed on both sides, so that the fastening bolt 4 can be tightened. Even if a distortion in the container radial direction occurs in the female thread portion 51a of the main bearing 31 due to the applied force, the distortion due to the fastening does not reach the cylinder 33, so that a reduction in the efficiency of the compressor due to the distortion of the cylinder 33 can be suppressed. Further, since the fastening hole 5 for final fastening is also used as the temporary fastening hole, positioning and fixing can be ensured even when the number of temporary fastening holes cannot be increased due to the limitation of the screw hole space. For this reason, it is advantageous also in terms of mechanical strength.

  Here, for the sake of convenience, the fastening female screw 51a is screwed into the fastening hole 51 of the main bearing 31, and the drill hole 52a is provided in the fastening hole 52 of the auxiliary bearing 32. Even if the bearing 32 side is replaced, a drill hole is formed on the main bearing 31 side, and a screw is formed on the sub-bearing 32 side, it can be assembled in the same manner. Furthermore, in the first embodiment, the positioning and fixing method of the present invention is applied to the assembly of the rotary compressor. However, the present invention is not limited to this, and the first and second members disposed at both ends are not limited thereto. The first and second members are overlapped with each other by at least one intermediate member that needs to be positioned with respect to each other, and the respective members are mutually connected by fastening bolts inserted through fastening holes that penetrate these members in the overlapping direction. It can be widely applied to those that are positioned and fixed to.

Embodiment 2. FIG.
FIG. 4 illustrates the dimensional relationship when the bolt fastening device according to the second embodiment of the present invention is applied to the compression mechanism portion of a rotary compressor that is exactly the same as that of the first embodiment. The side view which shows the volt | bolt for bolts (bolt A) 41, (b) is a side view which shows the bolt 4 for regular fixation, (c) is sectional drawing when an intermediate member is overlapped between the 1st, 2nd members. . In the figure, if the length (screw hole depth) of the female threaded portion 53a provided in the fastening hole 53 of the cylinder 33 is Nc, the depth of the drilled hole portion 53b is Kc, and the plate thickness of the cylinder 33 is Tc, then Tc = Nc + Kc. Further, the thickness of the flange-like portion where the female thread portion 51a of the main bearing 31 is processed is Ts, and the thickness of the flange-like portion where the sub-bearing 32 portion is drilled is Tf.

First, regarding the temporary fixing of the main bearing 31 and the cylinder 33, the length of the male screw portion 41a of the bolt A for temporarily fixing the main bearing 31 and the cylinder 33 is Na, and the shaft portion (non-screw portion) from the male screw portion 41a to the head portion 41b. ) When the length of 41c is Ka, in order to temporarily fix the main bearing 31 part and the cylinder 33 part with the bolt A, the length Na + Ka other than the head 41b of the bolt A is expressed as 31 is required to be equal to or greater than the length Kc of the drill hole 53b of the cylinder 33. The length Ka of the shaft 41c of the bolt A is equal to the thickness of the main bearing 31 and the cylinder 33 as shown in Formula 2. It must be smaller than the sum Ts + Tc.
Na + Ka> Kc + Ts (Formula 1)
Ka <Ts + Tc (Formula 2)

Further, when the bolt A is rotated and temporarily fixed, if the male screw portion 41a of the bolt A is simultaneously applied to the female screw portion 51a of the main bearing 31 and the female screw portion 53a of the cylinder 33, the screw cannot be fixed. The length Na must be smaller than the length of the drill hole 53b of the cylinder 33 as shown in Equation 3.
Na <Kc (Formula 3)
Next, regarding the fixing of the sub-bearing 32, the length of the male screw portion 4a of the main locking bolt 4 for fixing the main bearing 31, the cylinder 33, and the sub-bearing 32 portion as a unit is set to Nb, and from the male screw portion 4a to the head 4b. In order to fasten the main bearing 31, the cylinder 33, and the auxiliary bearing 32 with the main fastening bolt 4, the length of the main fastening bolt 4 other than the head 4b is assumed to be Kb. Nb + Kb is required to be equal to or greater than the thickness of the sub-bearing 32 and the thickness of the cylinder 33 as shown in Formula 4, and the length Kb of the shaft portion 4c of the main fastening bolt 4 is set to the main bearing as shown in Formula 5. It must be smaller than the sum of the thicknesses of the cylinder 31, the cylinder 33 and the auxiliary bearing 32.
Nb + Kb> Tf + Tc (Formula 4)
Kb <Tf + Tc + Ts (Formula 5)

Further, when the main fixing bolt 4 is rotated and fixed, if the male screw portion 4a of the main fixing bolt 4 is simultaneously applied to the male screw portion 51a of the main bearing 31 and the female screw portion 53a of the cylinder 33, the screw cannot be fixed. The length of the male screw portion 4 a of the locking bolt 4 must be smaller than the length Kc of the drilled hole portion 53 b of the cylinder 33 as shown in Equation 6.
Nb <Kc (Formula 6)
In addition, when providing a stepped hole (not shown) in the main bearing 31 part and the sub-bearing 32 part, the above formula can be used by setting the dimensions below the stepped hole part bottom to Ts and Tf.
The bolt fastening device according to the second embodiment defines the dimensions of each constituent member or constituent part as described above, and the temporary fastening holes cannot be increased due to the limitation of the screw hole space due to this configuration. However, it is possible to obtain the same effect as in the first embodiment, for example, it is possible to perform temporary fixing and permanent fixing with only the fixing fastening holes 5 without newly providing temporary fixing holes.

Embodiment 3 FIG.
5A and 5B are main part cross-sectional views showing a bolt fastening device according to Embodiment 3 of the present invention. FIG. 5A shows a first example, and FIG. 5B shows a second example. As shown in FIG. 5A, the first embodiment of the third embodiment has a structure in which the main bearing 31 portion is formed when the length of the female thread portion 53a of the cylinder 33 is longer than the length of the drill hole portion 53b. The length of the female screw portion 51 a to be provided is shortened to the upper side of the fastening hole 51 in the figure, while a drill hole portion 51 b is provided in the fastening hole 51 on the cylinder 33 end surface side (lower side in the drawing). 53b and the bore 51b of the main bearing 31 are made longer than the length Na (FIG. 4) of the male thread 41a of the bolt A and the length Nb of the male thread 4a of the main fastening bolt 4. The length of the male screw part 41a of the bolt A and the male screw part 4a of the main fastening bolt 4 can be secured.

  Further, in the second embodiment, as shown in FIG. 5B, the length of the drill hole 51 b of the fastening hole 51 provided in the main bearing 31 is made longer than the length of the male screw portion of the bolt A and the main fastening bolt 4. The fastening hole 53 provided in the cylinder 33 has a structure having only a female thread portion 53a. In the case of the second embodiment, the cylinder 33 can be assembled even when the length of the drill hole provided in the cylinder 33 cannot be secured sufficiently, or when the drill hole cannot be formed in the cylinder 33. In this case, since the margin of the male screw portion of the main fastening bolt 4 with respect to the female screw portion 31a of the main bearing 31 is shortened, the dimension Ts (FIG. 4) of the main bearing 31 portion is increased as necessary to increase the female screw portion 31a. It is necessary to increase the length to a size sufficient to ensure the design strength, or to adjust and manage the tightening torque.

Embodiment 4 FIG.
FIG. 6 is a sectional view showing an outline process in the order of assembly when the positioning and fixing method according to the fourth embodiment of the present invention is applied to the compression mechanism of a twin rotary compressor having two cylinders. In the figure, an intermediate member sandwiched between a first member (main bearing 31) and a second member (sub bearing 32) is composed of a first cylinder 34 and a second cylinder 35. An intermediate plate 39 that does not require high positioning accuracy is interposed between the two cylinders 34 and 35. A plurality of fastening holes 5 are provided in the circumferential direction through all the superposed members, that is, the main bearing 31, the first cylinder 34, the intermediate plate 39, the second cylinder 35, and the auxiliary bearing 32 in the superposition direction. It has been. Then, a female thread portion is screwed into the fastening hole of the second cylinder 35, and the fastening hole of the first cylinder 34 is configured in the same manner as the cylinder 33 of the first embodiment, so that the main bearing 31 and the sub-bearing 32 are fastened. The holes are formed in the same manner as in the first embodiment. Since the intermediate plate 39 does not require high positioning accuracy unlike other members, in the case of the configuration described above, it is not necessary to screw a female screw portion for temporary fixing into the fastening hole, and simply provide a drill hole. Thus, the hole can serve as a space where the male screw portion of the fastening bolt can idle.

  Hereinafter, the positioning and fixing method will be described in the order of processes. First, as in the first embodiment, the two members of the main bearing 31 and the first cylinder 34 are temporarily fixed with a plurality of temporary fixing bolts 41 (bolts A). Next, the second cylinder 35 and the first cylinder 34 (or the main bearing 31) are positioned in a state where the second cylinder 35 is overlapped with the first cylinder 34 via the intermediate plate 39. To do. One of the bolts A temporarily fixed with the positioning maintained is removed as shown in FIG. 6A, and the temporary fixing bolt 42 (bolt B having a length longer than that of the bolt A is removed in the removed fastening hole. Are screwed in from the main bearing 31 side, and the male screw portion 42a at the tip is screwed into the female screw portion of the second cylinder 35 and temporarily fixed. Similarly, the remaining bolts A are sequentially replaced with bolts B, and the second cylinder 35 is positioned and fixed as shown in FIG. Next, the secondary bearing 32 is superposed on the second cylinder 35 to position the two members. As shown in FIG. 6C, one of the bolts B that are temporarily fixed while maintaining the state is removed, and the final fixing bolt 4 that is longer than the bolt B is inserted into the same fastening hole 5 that has been removed. The process of screwing in from the auxiliary bearing 32 side and screwing the male screw portion 4a at the tip end into the female screw portion of the main bearing 31 is sequentially repeated to replace the bolt B with the main fastening bolt 4 and finally fix as shown in FIG. .

  As described above, even when the number of intermediate members sandwiched between the first member (main bearing 31) and the second member (sub bearing 32) is two, as in the first embodiment, the same fastening is performed. Using the holes, the overlapping and positioning of the two adjacent members and the temporary fixing by replacing the bolts are sequentially repeated, and finally the first fixing bolt 4 having a length penetrating all the overlapped members is used for the first fixing at both ends. By fastening the member and the second member, the members including the intermediate member sandwiched therebetween can be assembled in a state in which the mutual positioning is ensured. When the length of the intermediate plate 39 in the overlapping direction (thickness direction) is shorter than the length of the male thread at the front end of the bolt used for temporary fixing and permanent fixing, the first cylinder 34 or the second cylinder 35 is fastened. By machining the intermediate plate 39 side portion of the female screw portion provided in the hole as a hole portion and increasing the total length of the hole portion, the idle space of the male screw portion of the bolt can be secured. Also, even if the number of cylinders as intermediate members is three or more, similarly, by using a bolt having a male thread part only at the tip part, it can be temporarily fixed from the main bearing side, and finally from the auxiliary bearing side. It is obvious that a plurality of cylinders and the intermediate plate can be fastened together with a bolt having a threaded portion only at the tip.

  In addition, although it demonstrated so that positioning and temporary fixing of two members which adjoin sequentially in the superposition | polymerization direction may be repeated, it is not necessarily limited to this, For example, the main bearing 31 and the 1st cylinder 34 are temporarily fixed temporarily. On the other hand, the auxiliary bearing 32 and the second cylinder 35 may be temporarily fixed in the same manner, and then both may be positioned and combined. As described above, since two members can be positioned and fixed, it can be assembled without using a complicated positioning device, and even a rotary compressor having a plurality of cylinders in which the number of temporary fixing holes cannot be increased due to limitation of screw hole space or the like. Temporary fastening and permanent fastening can be performed with a fastening hole for permanent fastening without newly providing a fastening hole. In addition, by tightening the cylinder together with the main bearing and the sub-bearing without tightening the main thread with the female thread provided on the cylinder, even if the female thread of the main bearing is distorted in the container radial direction due to the tightening force, Since the distortion due to fastening does not spread, a significant effect can be obtained that the reduction in efficiency of the compressor due to cylinder distortion can be suppressed.

Sectional drawing which shows typically the rotary compressor by Embodiment 1 of this invention. It is a figure which shows typically the principal part of the rotary compressor shown by FIG. 1, (a) is sectional drawing which shows the positioning fixed state by the bolt for permanent fixing, (b) is the state which removed the bolt for permanent fixing Sectional drawing which shows this with the shape of the bolt for this stop | fastening. Sectional drawing explaining the positioning fixing method of each member which comprises the rotary compressor shown by FIG. 2 in assembly order. FIG. 7 is a side view showing a temporary fixing bolt (bolt A), illustrating a dimensional relationship when the bolt fastening device according to Embodiment 2 of the present invention is applied to a compression mechanism portion of a rotary compressor; (B) is a side view showing the main fastening bolt (bolt B), and (c) is a cross-sectional view when the intermediate member is overlapped between the first and second members. It is principal part sectional drawing which shows the bolt fastening apparatus which concerns on Embodiment 3 of this invention, (a) is a 1st Example, (b) is a 2nd Example. Sectional drawing which shows the outline process at the time of an assembly at the time of applying the positioning fixing method which concerns on Embodiment 4 of this invention to the compression mechanism part of the twin rotary compressor which has two cylinders.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Rotary compressor, 2 Electric motor part, 3 Compression mechanism part, 31 Main bearing (1st member), 32 Sub bearing (2nd member), 33 Cylinder (intermediate member), 34 1st cylinder, 35 2nd Cylinder, 39 intermediate plate, 4 bolts, 4a male screw, 4b head, 4c shaft, 41 temporary bolt (bolt A), 42 temporary bolt (bolt B), 5 fastening hole, 51 Fastening hole (main bearing portion), 51a female thread portion, 51b drill hole portion, 52 fastening hole (sub bearing portion), 52a drill hole portion, 53 fastening hole (cylinder portion), 53a female screw portion, 53b drill hole portion.

Claims (7)

A plurality of first and second members disposed at both ends are superposed via intermediate members that need to be positioned together with the first and second members, and each of these members penetrates in the superposition direction. a method for positioning and fixing the respective members together by inserted through a plurality of bolts fastening hole of the in the fastening hole of the fastening hole and the intermediate member of one of the members of the first and second members, the same A screw-sized female thread part is provided so that the mutual female thread parts are spaced apart from each other by a predetermined dimension during polymerization, while the bolt has a male thread part that engages with the female thread part only at the tip part. After positioning the first member and the intermediate member using a plurality of temporary fixing bolts and permanent fixing bolts of a predetermined length having a shaft portion having an outer diameter that can pass through the female screw portion, With temporary fixing bolt And the second member is positioned with respect to the intermediate member, one of the temporary fixing bolts is removed from one of the plurality of fastening holes, and the final fastening bolt is inserted into the removed fastening hole. A method of positioning and fixing, comprising the step of sequentially repeating the operation of inserting the intermediate member and fastening the intermediate member so as to be sandwiched between the first and second members and replacing the temporary fixing bolt with the final fixing bolt.   When the first member and the intermediate member are overlapped with each other between the female screw portions screwed in the fastening holes of the first member and the intermediate member, the temporary fixing bolt is placed in the intermediate portion in the axial direction. A drill hole having a size that allows the male screw part or the male screw part of the fixing bolt to run idle is interposed, and a screw hole part having an inner diameter similar to that of the drill hole part is provided in the fastening hole of the second member. The positioning fixing method according to claim 1, wherein:   In the method of manufacturing a rotary compressor, in the positioning and fixing method according to claim 1 or 2, the first member is a main bearing, the intermediate member is a cylinder, and the second member is a sub-bearing. A method for manufacturing a rotary compressor, which is used for positioning and fixing a cylinder and a sub-bearing.   4. The first cylinder and a second cylinder superposed via an intermediate plate that does not require high positioning accuracy with respect to the first cylinder are used as the intermediate member. A manufacturing method of a rotary compressor given in 2. A plurality of first and second members disposed at both ends are superposed via intermediate members that need to be positioned together with the first and second members, and penetrate each of these members in the superposition direction. in the bolt fastening apparatus these members mutually is positioned and fixed by a plurality of bolts inserted through the fastening hole of the internal thread portion for the stop in the fastening hole of one of the members of the first and second members The fastening hole of the intermediate member is provided with a female screw portion for temporary fixing of the same screw size that is screwed so as to be spaced apart by a predetermined dimension in the axial direction from the female screw portion for main fixing during polymerization. It has a male screw part screwed to the female screw part only at the tip part, and a plurality of fixed bolts of a predetermined length having an outer diameter shaft part that can pass through the female screw part between the male screw part and the head part. , The intermediate member is the first and the first Bolt fastening device characterized by comprising been fastened to sandwich in the member.   In the rotary compressor, with the bolt fastening device according to claim 5, the first member is a main bearing, the second member is a sub bearing, and the intermediate member is a cylinder. A rotary compressor characterized in that a sub-bearing is provided with a compression mechanism portion positioned and fixed by the main fastening bolt.   The said intermediate member consists of a 2nd cylinder superposed | polymerized through the 1st cylinder and the intermediate | middle plate which does not require high positioning accuracy with respect to this 1st cylinder. Rotary compressor.

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