JP4379075B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor used in a refrigeration cycle apparatus that constitutes an air conditioner or the like.

A compressor used in a refrigeration cycle apparatus constituting an air conditioner or the like includes a casing (sealed container), a compressor element housed on the lower side of the casing, and an electric motor housed on the upper side of the casing There is a hermetic rotary compressor with an element part. In such a hermetic rotary compressor, the above-mentioned hermetic container is generally formed by a pipe expanding plastic processing method (so-called expander method) using a plurality of split molds (expansion actuators) (for example, , See Patent Document 1). In this case, the hermetic container generally includes a barrel portion made of a cylindrical body, and the barrel portion is formed by the expander method. In the expander method, as shown in FIG. 17 , first, a plurality of (in this case, eight) split molds 81 are internally fitted into a cylinder 82 before molding. At this time, the split molds 81 are moved inward in the radial direction so that the side surfaces of the split molds 81, 81 facing each other along the circumferential direction are brought into a reduced diameter state. Next, each split mold 81... Is moved (expanded) radially outward as indicated by an arrow. Thereby, the inner peripheral surface 83 of the cylindrical body 82 is pressed by the arc-shaped outer surface 84 of each split mold 81..., And the pressing portion bulges to the outer diameter side. However, during this expansion, a gap is generated between the adjacent split molds 81, 81 along the circumferential direction. For this reason, the part which does not bulge between the bulging parts 85 and 85 remains, and an internal-diameter direction protrusion part (split part trace) 86 ... is formed.

By the way, as described above, the motor element portion is accommodated in the hermetic container. The motor element portion is disposed on the outer periphery side of the rotor that is fitted and fixed to the rotation shaft (crankshaft). And a stator. The stator has a core (stator core) and a coil wound around the stator core, and the stator core is fixed in the sealed container by shrink fitting. For this reason, generally, when the stator core is fixed in the container, the outer peripheral surface of the core comes into pressure contact with the protruding portion in the inner diameter direction of the container.
Japanese Patent No. 3372754 (page 3-5, FIG. 1)

  In such a compressor, a notch portion may be provided on the outer peripheral surface of the stator core in order to form a refrigerant gas conduction path. In this case, depending on the number, size, position, etc. of the notches, the contact area between the inner peripheral surface of the container and the outer peripheral surface of the core is reduced, and sufficient surface pressure for holding the stator cannot be generated. In addition, the support of the stator may become unstable.

By the way, in order to reduce the weight of the compressor, a so-called concentrated winding motor was prototyped. In this case, if the container is molded by the expander method as described above, depending on the product, a large vibration is generated and the noise is increased. That is, there was a large and small variation in noise among a plurality of products. In particular, the difference appeared remarkably in low-frequency vibrations of about 400 Hz to 500 Hz, which is harsh. Therefore, in pursuit of the cause, in the case where a part of the outer peripheral surface of the stator core is in pressure contact with the inner diameter direction protruding portion, the relative positional relationship between the inner diameter direction protruding portion and the outer peripheral surface of the stator core is not constant. Was cited as a factor. Was further investigated with this point, in what noise it is large, as shown in FIG. 18, a radially inward projecting portion 86, shown pressure contact portion 91 and a portion of the outer peripheral surface of the stator core 88 by ○ mark It became such two places. Therefore, a sufficient pressure contact force for holding the stator 87 cannot be generated, the support of the stator 87 becomes unstable, and a large noise is generated due to vibration during operation of the compressor. The present invention has been made based on the knowledge that it has been decided to do so.

  The present invention has been made to solve the above-described conventional drawbacks, and the object thereof is to stably support the stator in the sealed container, and to reduce vibration during operation. It is to provide a compressor with low noise.

Therefore, the compressor of claim 1 includes a sealed container 1 formed using a plurality of split molds 81, a compressor element portion 2 and a motor element portion 3 housed in the sealed container 1, The compressor in which the stator 26 of the motor element section 3 is fitted into the sealed container 1, and the greatest common divisor between the number of the split molds 81 and the number of the slots 53 of the stator core 30 of the stator 26 is In the compressor in which the number of notch portions 56 that has a common divisor of 3 or more with respect to the number of the split molds 81 is provided on the outer peripheral surface 55 of the stator core 30 when the number is less than 3. When there are eight inner-diameter protrusions 50 formed and six slots 53 of the stator core 30 of the stator 26, four or eight notches 56 of the stator core 30 of the stator 26 are provided. As above The pressure contact portion 58 and the outer peripheral surface is pressed against the projection 50 and the stator core 30, it is characterized in that arranged at equal pitches along the circumferential direction.

In the compressor according to the first aspect, since the number of notch portions 56 that have a common divisor of 3 or more with respect to the number of split molds 81 is provided on the outer peripheral surface 55 of the stator core 30, the circumferential direction is increased. Therefore, between the adjacent notches 56, 56, a press-contact holding portion 58 is formed in which the inner-diameter protruding portion 50 and the outer peripheral surface 55 of the stator core 30 are in press-contact with each other. Three or more 58 are provided. For this reason, the holding rigidity of the stator core 30 of the stator 26 is increased. Further, in this compressor, when there are eight inner-diameter protruding portions 50 formed at the time of molding and the number of slots 53 of the stator core 30 of the stator 26 is six, the notch portion of the stator core 30 of the stator 26 described above. The number 56 is set to four or eight, and the pressure holding portions 58 where the inner diameter direction protruding portions 50 and the outer peripheral surface 55 of the stator core 30 are in pressure contact are arranged at equal pitches along the circumferential direction, so that the stator core 30 is stable. Can be maintained in good balance.

  The compressor according to claim 2 is characterized in that the notches 56 are provided at an equal pitch along the circumferential direction.

In the compressor according to the second aspect, a plurality (three or more) of press contact holding portions 58 having a large surface pressure are arranged at an equal pitch along the circumferential direction.

According to the compressor of the first aspect, since the holding rigidity of the stator core of the stator is increased, the vibration of the compressor during operation can be reduced, and noise is reduced. Thereby, the outdoor unit etc. of a quiet air conditioner can be comprised. Further, according to this compressor, the balance of the press contact portion of the stator core with respect to the projecting portion in the inner diameter direction of the sealed container is further improved, and noise in the compressor is extremely reduced.

  According to the compressor of the second aspect, since the plurality (three or more) of pressure contact holding portions having a large surface pressure are arranged at an equal pitch along the circumferential direction, the pressure contact of the stator core with respect to the protruding portion in the inner diameter direction of the sealed container The balance of the location is improved. For this reason, the vibration in the motor element portion is suppressed, the noise in the compressor can be further reduced, and a quiet outdoor unit of an air conditioner can be configured.

  Next, specific embodiments of the compressor of the present invention will be described in detail with reference to the drawings, taking an example applied to a two-cylinder rotary compressor, for example. FIG. 2 is a cross-sectional view of the compressor. The compressor is a hermetic rotary compressor, and includes a casing (sealed container) 1 and a compressor element portion 2 housed on the lower side in the sealed container 1. And an electric motor element 3 housed on the upper side in the sealed container 1. This compressor is mounted on an outdoor unit of an air conditioner, for example. The sealed container 1 also has a cylindrical body 1a, a bottom member 1b connected to the lower part of the cylindrical body 1a, and a discharge pipe 49 connected to the upper part of the body 1a. And the upper lid member 1c.

  The compressor element portion 2 includes an upper cylinder 5, a lower cylinder 6, an upper support member 7 disposed on the upper side of the upper cylinder 5, a lower support member 8 disposed on the lower side of the lower cylinder 6, and the like. . A partition plate 9 is interposed between the upper cylinder 5 and the lower cylinder 6. And in this airtight container 1, the rotating shaft (crankshaft) 10 extended along an up-down direction is arrange | positioned at the axial center part. The crankshaft 10 is provided with a pair of bulging portions (eccentric portions) 11 and 12 whose axis is eccentric with respect to the axis of the crankshaft 10, and roller members 13 are respectively provided on the bulging portions 11 and 12. , 14 are externally fitted. The upper roller member 13 is accommodated in the upper cylinder 5, and the lower roller member 14 is accommodated in the lower cylinder 6.

  Further, suction ports 15 and 16 are formed in the upper and lower cylinders 5 and 6, respectively, and suction pipes 17 and 18 are connected to the suction ports 15 and 16, and the accumulators are connected via these suction pipes 17 and 18. The refrigerant gas is supplied from 20 to the cylinders 5 and 6. The upper support member 7 includes a cylindrical portion 7a and an outer flange portion 7b provided continuously to the lower end portion of the cylindrical portion 7a, and the crankshaft 10 is rotatably inserted into the axial center hole thereof. Further, the lower support member 8 also includes a cylindrical portion 8a and an outer flange portion 8b that is connected to the upper end portion of the cylindrical portion 8a, and the crankshaft 10 is rotatably inserted into the shaft center hole thereof. Furthermore, cup members 21 and 22 are attached to the upper and lower support members 7 and 8, respectively. The upper and lower cylinders 5 and 6 and the upper and lower rotary shaft support members 7 and 8 are connected and integrated by a bolt and nut joint 23.

  Next, the electric motor element unit 3 includes a rotor 25 that is fitted and fixed to the rotary shaft 10, and a stator 26 that is disposed on the outer peripheral side of the rotor 25. The stator 26 includes a core (stator core) 30 formed in a predetermined shape, and a coil 31 wound around a tooth 52 (see FIG. 1) of the stator core 30. The stator core 30 is fixed in the body 1a of the sealed container 1 by shrink fitting.

  A spacer 38 is attached to the upper end surface 36 of the rotor core 27 of the rotor 25, and an oil separation plate 42 made of a disk-shaped body is attached to the spacer 38 via an attachment base 41. The oil separation plate 42 is fixed in a state where the central portion is received by the receiving portion 43 of the mounting base 41.

  By the way, as shown in FIG. 18, the trunk portion 1a of the closed container 1 is molded (plastically processed) using eight split molds (expansion actuators). For this reason, as shown in FIG. 1, eight inner diameter direction protrusions (divided portion marks) 50... Are formed on the inner peripheral surface of the body portion 1a at a 45 degree pitch along the circumferential direction. 1 exaggeratedly describes the bulging portion 51 formed by pressing the inner diameter direction protruding portion 50 and the split mold 81, but is actually very small, for example, The protruding dimension of the inner diameter direction protruding portion 50 is set to about several tens of μm to several hundreds of μm.

  Next, the surface is supported by the pressure contact holding portion 58 having a large surface pressure at four locations, and the pressure contact holding portion 58 has two locations, which are slightly smaller than the surface pressure of the pressure contact holding portion 58. The amount of attenuation of the transfer function that affects noise generation was investigated in the case of having one contact portion 59 to be a pressure and in the case of having two pressure contact holding portions 58 and two contact portions 59. In this case, first, the radial transfer function was investigated. That is, the stator 26 is fixed to the body 1a by shrink fitting, and an excitation force is applied to the stator 26 by an impact hammer, and the measurement points in the assemblies shown in FIGS. 3 (a), 3 (b), and 3 (c). The gain (dB) in the radial direction at D1, measurement point D2, and measurement point D3 was investigated. In FIG. 3, the stator core 30 is schematically shown instead of the stator 26. In the assembly shown in FIG. 3A, two press contact holding portions 58 are provided at positions indicated by ◯, and a contact portion 59 having a slightly lower surface pressure than the press contact holding portion 58 is indicated by a △ mark. Are provided in two places. Also. In the assembly of FIG. 3B, the press-contact holding portion 58 is provided at two positions at the positions indicated by ◯ marks, and the contact portion 59 is provided at one position at the position indicated by △ marks. Further, the assembly of FIG. 3C is provided with four press-contact holding portions 58 at positions indicated by ◯ marks. In this case, the assembly of FIG. 3B is referred to as two-point contact, and FIG. 3C is referred to as four-point contact. In FIGS. 3A, 3B, and 3C, the position of the mark X is where the stator core 30 does not contact the inner-diameter-direction protruding portion 50 or the surface pressure is extremely small even if contacted. 30 holding parts are not configured. Further, in FIG. 3 (a), the four places indicated by ◯ marks by the two-dot chain line, and in FIG. 3 (b) and FIG. 3 (c), the eight places indicated by the ◯ marks by the two-dot chain line. A small cutout 60 as shown in FIG. 3 (b) and FIG. 3 (c) are different in the circumferential position of the stator core 30 with respect to the body 1a because the body 1a and the stator core 30 have the same shape. ing. That is, in FIG. 3 (c), as can be seen from the suction port position, the body portion 1a is moved by a predetermined angle (7.5 degrees in this case) with respect to the stator core 30 as compared with FIG. 3 (b). It is shifted in the direction of the arrow (c) (counterclockwise direction).

  The gain (dB) in the frequency range of 0 Hz to 5000 Hz at the measurement point D2 is a graph shown in FIG. Further, the gain (dB) at the measurement point D1 at 0 Hz to 1000 Hz, which is the low frequency region of the harshness, is a graph shown in FIG. Thus, the gain (dB) at the measurement point D3 from 0 Hz to 1000 Hz is a graph shown in FIG. At this time, in each of FIGS. 5 to 8, the case of the assembly of FIG. 3 (a) is indicated by a one-dot chain line, the case of the assembly of FIG. 3 (b) is indicated by a two-dot chain line, and FIG. The case of this assembly is shown by a solid line. Thus, there is not much difference between the two-point contact and the four-point contact in the radial transfer function. By the way, the gain (dB) can be obtained by the following equation (1).

  Next, the gain (dB) of the transfer function in the vertical direction (axial direction) at the measurement point D4, the measurement point D5, and the measurement point D6 was investigated. In this case, the gain (dB) in the frequency range of 0 Hz to 5000 Hz at the measurement point D5 is a graph shown in FIG. Further, the gain (dB) at the measurement point D4 from 0 Hz to 1000 Hz becomes a graph shown in FIG. 9, and the gain (dB) at the measurement point D5 from 0 Hz to 1000 Hz becomes a graph shown in FIG. 10, and the measurement points from 0 Hz to 1000 Hz. The gain (dB) at D6 is a graph shown in FIG. Also in this case, the case of the assembly of FIG. 3A is indicated by a one-dot chain line, the case of the assembly of FIG. 3B is indicated by a two-dot chain line, and the case of the assembly of FIG. 3C is indicated by a solid line. Show. From these, it can be seen that the gain (dB) of the four-point contact is lower than that of the two-point contact. By the way, those having a high gain are amplified, and those having a low gain are effective in attenuating. For this reason, in the case of the four-point contact, the gain is reduced and a damping effect can be obtained, so that axial vibration can be reduced. That is, if the four-point contact is used, the vibration in the axial direction can be reduced, the vibration of the entire compressor during operation can be reduced, and the noise can be reduced.

  Furthermore, gains were examined for 2-point contact, 3-point contact, 4-point contact, and 5-point contact, and the results are shown in FIGS. In addition, each 2 point | piece contact, 3 point | piece contact, 4 point | piece contact, and 5 point | piece contact can be formed by changing the insertion angle of the stator core 30 with respect to the airtight container 1, respectively. In this case, FIG. 14 is an enlarged view from 0 Hz to 1000 Hz in FIG. Also, the two-point contact was a two-dot chain line, the three-point contact was a one-dot chain line, the four-point contact was a broken line, and the five-point contact was a solid line. Also from these, from 0 Hz to 1000 Hz, the gain at the two-point contact is high, and the gain at the four-point contact and the five-point contact is low. In the three-point contact, the gain is higher than that in the four-point contact and the five-point contact, but is lower than that in the two-point contact.

  From this, the gain is high and difficult to attenuate with two-point contact, and with such a core support, vibration cannot be reduced and there is a risk of generating large noise, whereas with four-point contact and five-point contact, It can be seen that the gain is low and the generated noise can be reduced by reducing vibration. At this time, since there is not much difference in gain between 4-point contact and 5-point contact, it can be said that 4-point contact or more is preferable. In addition, the gain at the three-point contact is higher than that at the four-point contact, but this three-point contact also has a damping effect, and a compressor with relatively low noise can be configured. That is, as this type of compressor, it is only necessary to have at least three press contact holding portions 58 where the inner diameter direction protruding portion 50 and the outer peripheral surface of the stator core 30 are pressed. At this time, it is preferable to have a pair of press contact holding portions 58 and 58 that are point-symmetric with respect to the core axis O.

  Next, the vibration in the vertical direction at the casing top of the compressor during operation was investigated in a low frequency band of 400 Hz and 500 Hz. That is, an acceleration sensor (not shown) is attached to the upper cover member 1c of the hermetic container (casing) 1 of the compressor, and the acceleration is detected by this acceleration sensor. In this case, the correlation between acceleration and sound was investigated. As shown in Table 1, the sound data is 56.0 dB for the 400 Hz component and 55.1 dB for the 500 Hz component in the two-point contact (before improvement in Table 1). In the 4-point contact (after improvement in Table 1), the frequency is 52.8 dB for the 400 Hz component and 52.9 dB for the 500 Hz component.

The top acceleration, as shown in the following Table 2, the two-point contact (before improved in Table 2) is 1.9m / ^{s 2} at 400Hz component, is 1.9m / ^{s 2} at 500Hz component On the other hand, in the four-point contact (after improvement in Table 2), the 400 Hz component is 0.5 m / s ² and the 500 Hz component is 0.5 m / s ² . These data are average values obtained by measuring a plurality of times (6 to 9 times as shown in Tables 1 and 2). Moreover, in FIG. 15, the top acceleration in 315Hz-630Hz was shown. In this case, the solid line indicates four-point contact, and the two-dot chain line indicates two-point contact. Thus, it can be seen that the top acceleration is different between the two-point contact and the four-point contact in the low-frequency region, and is reduced in the case of the four-point contact, and exhibits an excellent damping effect. In particular, an excellent damping effect is exhibited in a low frequency range of 400 Hz to 500 Hz.

  Thus, it can be seen that a four-point contact exhibits an excellent damping effect. Therefore, the configuration shown in FIG. 1 is configured to enable four-point contact. If this embodiment is described in detail, the number of split molds 81 is eight as described above. The core (stator core) 30 of the stator 26 has six teeth 52... Formed on the inner peripheral surface and six slots 53. For this reason, the greatest common divisor between the number of split molds 81 and the number of slots 53 of the stator core 30 of the stator 26 is less than 3. And the outer peripheral surface 55 of the core 30 is formed with notches 56... For forming a refrigerant gas conduction path. In this case, the number of notches 56 having a common divisor of 3 or more with respect to the number of split molds 81 is provided at an equal pitch along the circumferential direction. Specifically, four notches 56 are provided at a 90-degree pitch along the circumferential direction.

  For this reason, if the stator core 30 is shrink-fitted to the body portion 1 a, the four inner diameter direction protruding portions 50... Arranged in the circumferential direction are adjacent to each other along the circumferential direction of the stator core 30. It can be press-contacted to the outer peripheral surface 55 between the notch parts 56 and 56 which fit. That is, the pressure contact holding portions 58 of the inner diameter direction protruding portion 50 and the outer peripheral surface 55 of the stator core 30 are formed at four positions a, b, c, and d in FIG. It arrange | positions at equal pitch (90 degree pitch) along this circumferential direction.

  As described above, in the embodiment of FIG. 1 described above, four-point contact is performed, and the notch portion 56 of the stator core 30 of the stator 26 is evenly arranged with respect to the protruding portion 50 in the inner diameter direction of the sealed container 1. it can. For this reason, the vibration of the compressor during operation can be reduced, and noise is reduced. Thereby, the outdoor unit etc. of a quiet air conditioner can be comprised. In addition, the press-contact holding portions 58 where the inner-diameter protruding portion 50 and the outer peripheral surface 55 of the stator core 30 are in press-contact with each other can be arranged at an equal pitch along the circumferential direction. it can. That is, the unbalance of the press contact portion of the stator core 30 with respect to the protruding portion 50 in the inner diameter direction of the sealed container 1 is reduced, the vibration in the motor element portion 3 is suppressed, and the noise in the compressor can be further reduced.

  Next, FIG. 16 shows another embodiment. In this case, eight notches 56 are provided at a 45 degree pitch along the circumferential direction. Therefore, if the stator core 30 is shrink-fitted to the body portion 1 a, the inner-diameter-direction protruding portions 50... Can be brought into pressure contact with the outer peripheral surface 55 between the adjacent notches 56 and 56 along the circumferential direction of the stator core 30. it can. That is, the press-contact holding portions 58... Between the inner-diameter protruding portion 50 and the outer peripheral surface 55 of the stator core 30 are formed at eight locations a1, b1, c1, d1, e1, f1, g1, and h1 in FIG. The portions 58 are arranged at an equal pitch (45 ° pitch) along the circumferential direction. For this reason, even in this case, eight press-holding portions 58 where the inner-diameter protruding portion 50 and the outer peripheral surface 55 of the stator core 30 are in pressure contact can be arranged at equal pitches along the circumferential direction. And it can fix to the airtight container 1 with balance by shrinkage fitting.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the increase / decrease in the number of split molds 81 used in the expander method at the time of molding the sealed container 1 is arbitrary. In this case, if the split mold 81 is increased, the inner-diameter protruding portion 50 increases, and conversely, if the split mold 81 is decreased, the inner-diameter protruding portion 50 decreases, and the number of the cutout portions 56 of the stator core 30 is increased. In addition, it is necessary to change the arrangement pitch in accordance with the inner diameter direction protruding portion 50. Further, the number of slots 53 (number of slots) of the stator core 30 can be changed. In this case, in consideration of balance and the like, various numbers can be set according to the number of split molds 81, that is, the number of inner diameter direction protrusions 50. When the stator 26 is fitted and fixed in the hermetic container 1, it is shrink-fitted in the above embodiment, but may be press-fitted and fixed.

It is a principal part simplified sectional top view which shows embodiment of the compressor of this invention. It is sectional drawing of the said compressor. The measurement points of the transfer function when an excitation force is applied are shown, (a) is a simplified cross-sectional plan view of the main part when the positional relationship between the sealed container and the core is not regulated, and (b) is 2 It is a principal part simplified cross-sectional top view in the case of a point contact, (c) is a principal part simple cross-sectional top view in the case of 4 point contact. It is explanatory drawing which expands and shows a part of said FIG. It is a graph which shows the gain with respect to radial vibration in the measurement point D1. It is a graph which shows the gain with respect to radial direction vibration in the measurement point D2. It is a graph which shows the gain with respect to radial direction vibration in the measurement point D3. It is a graph which shows the gain with respect to radial direction vibration in the measurement point D2. It is a graph which shows the gain with respect to the up-down direction vibration in the measurement point D4. It is a graph which shows the gain with respect to the up-down direction vibration in the measurement point D5. It is a graph which shows the gain with respect to the up-down direction vibration in the measurement point D6. It is a graph which shows the gain with respect to the up-down direction vibration in the measurement point D5. It is a graph which shows the gain with respect to the vertical vibration in 2 point | piece contact, 3 point | piece contact, 4 point | piece contact, and 5 point | piece contact. It is the graph figure which expanded a part of said FIG. It is a graph which shows the acceleration from 315Hz to 630Hz. It is a principal part simple sectional top view which shows other embodiment of the compressor of this invention. It is a schematic diagram which shows the method of shape | molding an airtight container. It is a principal part simplified cross-sectional top view of the conventional compressor.

Explanation of symbols

  1 .. Sealed container 2.. Compressor element part 3.. Motor element part 26.. Stator 30.. Stator core 50.. Projection in the inner diameter direction 53. 56 ··· Notch portion, 58 · · Pressure holding portion, 81 · · Split mold

Claims (2)

A sealed container (1) formed using a plurality of split molds (81), a compressor element part (2) and a motor element part (3) housed in the sealed container (1) The stator (26) of the motor element part (3) is a compressor in which the hermetic container (1) is inserted, and the number of the split molds (81) and the stator core (26) of the stator (26) 30) When the greatest common divisor with the number of slots (53) is less than 3, the outer peripheral surface (55) of the stator core (30) is 3 or more with respect to the number of split molds (81). In the compressor provided with the number of notches (56) having a common divisor, the inner diameter direction protrusions (50) formed at the time of the molding are eight, and the stator core (26) 30) When there are six slots (53), the stator (26) The number of notches (56) in the data core (30) is four or eight, and the press-holding portion (58) where the inner-diameter protruding portion (50) and the outer peripheral surface of the stator core (30) are in pressure contact is provided in the circumferential direction. A compressor characterized by being arranged at an equal pitch along . The compressor according to claim 1, wherein the notches (56) are provided at equal pitches along the circumferential direction.