JPS58131392A - Rotary compressor - Google Patents

Abstract

PURPOSE:To contrive to reduce the overall height of a compressor by improving a bolt fastening construction for a pump part and the construction of a passage for intake gas, and contrive to reduce the side of the compressor in the radial direction by improving locations of tack-welded parts and a welded part of a support base. CONSTITUTION:A pump is assembled in a fastening construction wherein the entire part of the component parts is fastened by a through-bolt 13 penetrated from below, an upper bearing 21 and a stator 2c are closely spaced, and the passage for the intake gas is provided at the upper bearing 21, unlike a conventional design wherein the passage is provided at a cylinder part 22. Accordingly, the support base (not shown) can be located between the lower end surface of a casing 1 and a suction pipe 16, and the height of the compressor can be reduced. Further, the shape of the upper bearing 21 and the tack weld positions of the bearing 21 against the casing 1 are set in a trisected arrangement which secures a balance of stresses, and the weld position of the support base is appropriately located between the tack weld positions, whereby the effects of thermal stresses and strains are improved. Accordingly, the dimension between the inside diameter part 22a of the cylinder and the outside diameter of a flange 21b of the bearing 21 can be reduced, and it can be contrived to reduce the size of the compressor in the radial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary unit compressor aimed at ultra-miniaturization.

A conventional rotary compressor will be explained with reference to FIGS. 1 to 4. 1 is a case, 2 is an electric motor, and 3 is a pump section.

In the case 1, a lid chamber 4 and a bottom chamber 5 are fitted and welded to form a closed container. The outer diameter of the stator 2a of the electric motor 2 is joined to the inner diameter of the case 1 by burning, and the stator 2a and the rotor 2b of the electric motor 2 are arranged at relative positions with an appropriate gap between them. . The pump section 3 has a rotating shaft 6 which is connected to the rotor 2b by press-fitting or the like as a central part, a roller 7 that fits and slides on the eccentric part 6a of the rotating shaft 6, and an upper surface of the roller 7 and an upper journal of the rotating shaft 6. an upper bearing 8 that covers the sliding movement of the roller 7 and a lower bearing 9 that covers the sliding movement of the F section journal 60 of the rotating shaft 6, etc.
, Ii'+i, the upper and lower bearings 8.9 are joined together, and the cylinder 11 and the like slidably hold the vane 10 which slides on the outer diameter of the roller 7. 12 is a discharge muffler, and the muffler 12 is used to eliminate the pulsation of the discharged gas discharged from a valve mechanism (not shown) attached to the lower bearing 9, and to prevent the lubricating oil stored in the lower part of the case 1 from foaming. The lower bearing 9 is screwed into the cylinder 11 at the same time as the lower bearing 9 with a bolt 13. FIG. 2 shows an example of the arrangement of the duck welded portions 1a of the case 1 and the cylinder 11. The flange portions 11a of the cylinder 11 are formed at two arbitrary widths and welded at three arbitrary positions. In FIG. 3, 14 is a suction pipe attached to the case 1, and 15 is a seal pipe.
The side is press-fitted and mechanically sealed, and the tip 14a of the suction pipe 14 of the case 1 and the rear end 1 of the seal pipe 15 are
5b are arranged at the same position, and these are simultaneously brazed to the suction pipe 16 of the rotary compressor tower unit (not shown) as shown in FIG. 3 to form a seal in the suction gas flow path. . Figure 4 shows the state of connection between the upper bearing 8, the lower bearing 9, and the cylinder 11. In a conventional rotary compressor, the cylinder 11 has a screw hole 11C.
was opened and the upper and lower bearings 8, 9, etc. were screwed in and fastened from the top and bottom using bolts 15 as shown in FIG. 4, respectively.

Reference numeral 17 denotes a support leg for attaching a pair of units, and the support leg 17 is a first
As shown in the figure, it is formed on the bottom surface of the bottom chamber 5 by drawing a steel plate or the like, and then fixed by resistance welding or the like.

The conventionally known rotary unit compressor described above had the following drawbacks. That is, upper bearing 8 fastening bolt 1
In order to maintain an appropriate insulation distance between the end faces of the end coil 2C of the stator 2a disposed above the head 13a of the upper bearing 8, It is necessary to widen the space 18 between the stator 2a and the stator 2a. In addition, the suction gas passage is formed in the cylinder 11.
However, in this case, it is possible only when the cylinder 11 is relatively simple (in the direction where the overall length of the compressor increases) compared to the inner diameter of the suction port 11b. In terms of overall length, suction pipe 14
It will be located below the suction pipe installation position of the present invention as described above.

As a result, if the painted support leg 17 came close to the suction pipe of the paired unit, there was a risk that the painted surface would be burned by the flame of the brazing burner. As shown in the figure, the support leg 17 is placed on the bottom side of the rotary complete compressor.
It had the disadvantage that it had to be installed. In addition, as shown in Fig. 2, the tack welds that cause thermal deformation to case 1 and cylinder 11 are disposed unevenly, so case 1
deforms as shown by the broken line, and as a result, in order to prevent the effect on the precision fitting part as much as possible, it is necessary to increase the cape of the rigid part lid of the cylinder 11, which leads to an increase in the size of the compressor in the radial direction ( The above-mentioned conventional rotary unit compressors have the disadvantage of being extremely elongated in height and radial direction, and the unit on which the compressor is installed is very tall. If the height of the compressor is (1↓i
f fj' It had disadvantages such as not being able to be used in a single unit which would affect the internal volume of the nursery.

The present invention has been made to improve the above defects.

In other words, by improving the bolt tightening structure of the pump part, moving the structure of the training waste flow meander to the -L part bearing side, and moving the support legs to the side of the case, the overall height of the rotary complete compressor was reduced. The purpose of this project is to reduce the diameter dimension, improve the placement of the tack weld and the support m-weld, and also reduce the compression radius.

The present invention will be explained below with reference to an embodiment shown in FIGS. 5 to 11.

FIG. 5 shows the assembled rotary compressor according to the present invention, in which 20 is a pump section, 21 is an upper bearing,
22 is a cylinder, and 23 is a support leg. In addition, the same reference numerals as in the conventional example indicate the same or corresponding members. That is,
An electric motor 4m2 is arranged at the upper part of the inner diameter of the case 1, and a pump part 20 is arranged at the lower part.The pump part 20 has a rotating shaft 8, an upper bearing 21 on the upper part of the roller 7, and a cylinder 22 directly below it. are joined, and the cylinder 22
A lower bearing 9 is arranged at the lower part of the pump as shown in FIG. 5, and the case 1 and the pump section 20 are fixed between the flange 21b of the upper bearing 21 by welding. FIG. 6 shows an example of the detailed shape of the upper bearing 21 and cylinder 22 shown in FIG. 5. The upper bearing 21 has a shape obtained by cutting an originally circular disc-shaped flange at three places around the journal portion 21a. 7 lunges of any width 2
1b is formed, including the cylinder 22 and the lower bearing 9.
A screw hole 21C is bored into which the screws are screwed. 21d
is a protrusion formed to an arbitrary length from the outer diameter of the flange 21b,
A gas suction port 21e is opened within the wall formed by the projection 21d and the seven flange 21b, as shown in FIG. The cylinder 22 has a shape that is greatly reduced from the flange portion 11a of the conventional cylinder 11, and includes an inner diameter portion 22a where the roller 7 rotates, a vane slot portion 22b, a bolt through hole 2
2C etc. are opened, and the radius from the center of the inner diameter part 22a to the maximum outer circumference part 22d is the same as that of the upper bearing 21.
The radius is set smaller than the radius of the 7 flange 21b. FIG. 7 shows the assembled state of the upper bearing 21, the cylinder 22, the lower bearing 9, the discharge muffler, etc. The bolts 13 are passed through the bolt holes 22C opened at positions relative to the screw holes 21C of the upper bearing 21, respectively, and the upper Each component is fastened to the bearing 21 screw hole 21C. In this case, the tip end 13b of the bolt 13 is dimensioned so that the screw insertion and fastening is completed at approximately the same position as the upper surface 21f of the upper bearing 21. FIG. 8 explains the formation structure of the suction gas passage that seals the case 1 and the pump 20.
A vertical hole 21g communicating with the cylinder inner diameter 22a is bored at the opening end side of the suction port 21e of the upper bearing 21, and the end 15a of the seal pipe 15 passes through the inner diameter of the suction pipe 14 brazed to the case 1, and the end 15a of the seal pipe 15 is inserted into the upper part. It is press-fitted into the suction port 2ie of the bearing 21 to create a mechanical seal therebetween, and the rear end 15b of the seal pipe 15.
is arranged at the same position as the tip of the suction pipe 14 of the case 1, and is sealed and brazed at the same time as the suction pipe 16 of the rotary complete compressor tower-mounted unit of the present invention to form a suction gas passage. FIG. 9 shows the relationship between the protrusion 21d of the upper bearing 21 and the end face of the end coil 2C of the stator 2a of the electric motor 2. The end coil is locally formed to follow the overall shape of the protrusion 21d, and other A space 18 is formed between the upper bearing upper surface 21f and the end coil 20 to maintain an appropriate insulation distance. Note that the end coil is not locally molded (however, since it is customary for electric motors operating with two or four poles to have valleys formed by the arrangement of windings, the valley part of the end coil is formed with the protrusion 21d. The purpose of maintaining the insulation distance described above can be achieved by placing the
Figure 0 shows the case 1 and the flange 21b of the upper bearing 21.
This explains the relationship between the position of the tag weld 1a between the case 1 and the position of the electric resistance weld between the case 1 and the support leg 23.The tack weld 1a is set at three locations dividing the circumference into three equal parts, and the mounting position of the support leg 23 is explained below. are located at three locations between the tack welds 18.

The shape indicated by the broken line in FIG. 1O shows the state of deformation caused by the elimination of the residual stress in the case 1 at the superheating temperature during each welding. FIG. 11 shows that the suction gas passage, which was formed in the cylinder 11 part of the conventional rotary compressor, is formed in the upper bearing part in the upper position in the present invention, and as a result, the distance between the suction pipe 14 and the lower end surface of the case 1 is increased. This shows an example of a state in which the paired unit support legs 23 are attached between them.

As described above, the present invention has a pump assembly structure in which all the components are tightened by the through bolts 13 from below, so that the 8-part bearing and the stator are brought closer to each other.
In addition, the configuration of the suction gas passage was shifted from the conventional cylinder part to the upper bearing, which made it possible to place support legs between the lower end of the case and the suction pipe, which increased the compressor height. Dimension shrinkage is possible, birth number O
The thickness of the cylinder itself is not subject to direct tack welding distortion compared to conventional ones, and the rigid part 22e formed by the outermost cylinder part 22d and the vane slot part 22b can be reduced, which in turn reduces the cylinder inner diameter 22a. By increasing the diameter, the thickness can be significantly reduced, and in this respect, the height of the compressor can also be expected to be significantly reduced. Upper bearing 21
The welding position of the tack and the case 1 was divided into three equal parts to balance stress, and the welding position of the support leg was also placed appropriately between the tack welding parts, making it a precision interlocking part. Since the thermal strain stress of the rotary set interferes with each other and its spread has been improved, it is possible to reduce the distance between the cylinder inner diameter part 22a and the outer diameter of the upper bearing 21 flange 21b, and as a result, the radial direction of the rotary set compressor can be reduced. It becomes possible to reduce the size. Further, since the distance between the support leg 23, the paired unit suction pipe 16, and the case suction pipe 14 is changed so that the mounting position of the vibrator 14 is moved upward as described above, the painted surface will not be burned by the burner flame.

As described above, the present invention has a great practical effect in reducing the size of an external vibration-isolated rotary compressor.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of the structure of a conventionally known external vibration-isolated rotary complete compressor, and Fig. 2 is a plan sectional view showing an example of the welded state of the case and pump cylinder of the conventionally known compressor. , FIG. 3 is a side cross-sectional view showing an example of the suction gas passage structure of the conventionally known compressor shown in FIG. 1, and FIG. 4 is a side cross-sectional view showing the bolted state of pump components of the conventionally known compressor Fig. 5 is a side sectional view showing the collectively assembled structure of the external vibration-isolated rotary set compressor according to the present invention, and Fig. 6 is an upper part constituting the pump section of the rotary set compressor of the present invention shown in Fig. 5. FIG. 7 is a perspective view showing an example of the shape of a bearing and a cylinder, FIG. 7 is a side sectional view showing an example of a collective assembly structure using through bolts for the pump component parts of the rotary compressor of the present invention, and FIG. 8 is a perspective view of the rotary compressor of the present invention. FIG. 9 is a side sectional view showing an example of the structure of the suction gas flow path of the rotary set compressor of the present invention; FIG. Fig. 10 is a plan view showing an example of the welding positions of the case, upper bearing, and support of the present invention, and Fig. 11 shows an example of welding support legs between the lower end surface of the case and the suction pipe on the side of the case. FIG. 20...Pump, 21...Upper bearing, 21J
l... Journal part, 21b... Flange, 21C
...Screw hole, 21d...Protrusion, 21e...Gas inlet, 21f...Top surface of upper bearing, 21g...
Vertical hole, 22...Cylinder, 22a...Inner diameter part, 22
b...Vane slot portion, 22G...Bolt through hole, 22d...Cylinder outermost periphery, 22e...Rigid portion, 23...Support leg. No. 10≧1 岑20 '15 口'J16riiJ 蓼7 fig T, 8fl v-9th 'f, to fi *Continuation of I1 fig. 1 page 0 Inventor Mitsuru Murata Bold Tomita, Ohira-cho, Shimoga-gun, Tochimoto Prefecture 800 Hitachi, Ltd. Tochigi Factory

Claims (1)

[Scope of Claims] 1. If the structure of the pump part in an external vibration-proof rotary compressor in which the electric motor is placed at the top and the pump part is placed at the bottom is tack welded to the case to which the motor stator is directly connected, the same number can be obtained. A cylinder in which a threaded hole is formed in the upper bearing, which has a flanged portion in which a gas suction port through which suction gas flows from the outside of the case is opened, and a bolt through hole is drilled at a relative position of the thread size, a lower bearing; A rotary complete compressor, characterized in that a discharge muffler is bolted to the upper bearing from below. 2. The tip of the tightening bolt of the cylinder lower bearing discharge muffler should be located approximately at the same position as the upper surface of the upper bearing, and the lower end surface of the motor stator end coil and the upper surface of the main bearing should be close to the minimum space that maintains an appropriate insulation distance. A rotary complete compressor according to claim 1, characterized in that: 3. A protrusion is formed on a part of the upper surface of the 7th rank part of the upper bearing to increase the flange thickness, and a suction port that becomes a suction gas passage is opened by driving a pipe into the protrusion from outside the case, and the protrusion is Claim 1 characterized in that the end fill of the motor stator that is located close to the motor stator is formed in a concave manner.
Or the rotary complete compressor described in paragraph 2. 4. Braze a suction pipe to the pipe installation hole opened in a part of the case opposite to the gas suction port opened in a part of the 7th rank part of the upper bearing, and drive a seal pipe into the suction port through this to draw suction. In a rotary compressor structure forming a gas passage, a supporting leg for attaching a pair of units is attached between a suction pipe of a case and a lower end surface of the case, as set forth in claim 1 or 3. rotary complete compressor. 5. Form the flange part that covers the case and the tack weld into three equal parts with an arbitrary width, and fix the three middle parts of the seven rung parts and the case with tack welding, and the center part between the weld parts. Claim 1 or 4, characterized in that the supporting legs for attaching the unit to the case are attached to the case in three equal parts.
Rotary complete compressor as described in section.