JP2005226532A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor having a highly strong and highly corrosion resistant sealed vessel. <P>SOLUTION: This compressor 10 has a motor-driven element 14, a rotary compression mechanism part 18 connected to this motor-driven element 14, and the sealed vessel 12 for storing these motor-driven element 14 and rotary compression mechanism part 18 inside. The sealed vessel 12 is formed of a material mainly composed of aluminum, and compresses and delivers an introduced refrigerant by driving the rotary compression mechanism part 18 by the motor-driven element 14. Here, rust preventive processing is applied to the sealed vessel 12. Thus, even if the sealed vessel 12 is formed of the material mainly composed of the aluminum and much in the content of Cu, since this sealed vessel 12 can prevent corrosion, this sealed vessel 12 can be formed with high rigidity and high corrosion resistance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor including, for example, an electric element, a compression element connected to the electric element, and a sealed container that houses the electric element and the compression element.

  Conventionally, an electric element, a compression element coupled to the electric element, and a sealed container that accommodates the electric element and the compression element therein, and the refrigerant introduced by driving the compression element with the electric element There is known a compressor that compresses and discharges.

Such a compressor is mounted on an engine room of an electric vehicle (HEV, PEV, etc.) and used for a car air conditioner, for example. In this case, in order to improve the fuel efficiency of an automobile, the weight of the compressor is reduced by forming the sealed container with a material mainly composed of aluminum (see, for example, Patent Document 1).
JP 2002-174179 A

  By the way, the compressor used for the car air conditioner is often in a flooded state as the weather changes when the automobile is running. Therefore, the sealed container is required to have not only rigidity but also corrosion resistance. Therefore, attempts have been made to ensure rigidity and corrosion resistance by adjusting the content of Cu in the material forming the sealed container.

  However, if the content of Cu contained in the material containing aluminum as a main component is reduced, the corrosion resistance can be improved, but the rigidity is lowered. On the other hand, if the Cu content is increased, the rigidity can be improved, but the corrosion resistance is lowered. Therefore, it has been difficult to make the sealed container highly rigid and highly corrosion resistant.

  The objective of this invention is providing the compressor provided with the high intensity | strength and high corrosion-resistant airtight container.

  The compressor of the invention of claim 1 includes an electric element, a compression element coupled to the electric element, and a sealed container that accommodates the electric element and the compression element therein, and the sealed container contains aluminum. A compressor that is formed of a material as a main component and that compresses and discharges the introduced refrigerant by driving the compression element with the electric element, and the sealed container is rust-proofed. It is characterized by that.

  According to the invention of claim 1, since the sealed container is subjected to the rust prevention treatment, even if the sealed container is formed of a material mainly composed of aluminum and having a high Cu content, the sealed container is not corroded. Since this can be prevented, the sealed container can have high rigidity and high corrosion resistance.

  The compressor of the invention of claim 2 is characterized in that, in addition to the above, the rust prevention treatment is electrodeposition coating.

  When the antirust treatment is applied by spray coating, the surface of the sealed container is uneven, which may cause uneven coating and may not reliably prevent corrosion of the sealed container. Therefore, according to the second aspect of the present invention, since the rust prevention treatment is electrodeposition coating, the surface of the sealed container can be uniformly treated, and the sealed container is corroded compared to the case of spray coating. Can be surely prevented.

  In the compressor of the invention of claim 3, in addition to the above, the sealed container is mainly composed of Al, Si is 1 wt% or more and 12 wt% or less, Mg is 2 wt% or less, and Cu is 0.5 wt%. % And 5% by weight or less, and is T6 treated.

  According to the invention of claim 3, the sealed container contains Al as a main component, Si is contained in an amount of 1 to 12% by weight, Mg is contained in an amount of 2% by weight or less, and Cu is contained in an amount of 0.5 to 5% by weight. The rigidity of the sealed container can be further improved because the T6 treatment is performed.

  According to the compressor of the present invention, the following effects can be obtained. Since the sealed container is rust-proof, it can be prevented from corroding even if the sealed container is made of a material mainly composed of aluminum and containing a large amount of Cu. And it can be set as high corrosion resistance. Further, when the compressor is used in a car air conditioner, the compressor and the refrigerant pipe are often connected with bolts in consideration of the assembly efficiency of the vehicle. Therefore, since the shape of the connecting portion with the bolt of the compressor inevitably becomes complicated, there is a possibility that water accumulates in the connecting portion and rusts. In such a case, the rust can be effectively prevented.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a rotary compressor 10 as an internal intermediate pressure type multi-stage (two-stage) compression compressor provided with a first rotary compression element 32 and a second rotary compression element 34 according to the present embodiment.

The rotary compressor 10 is an internal intermediate pressure multistage compression rotary compressor that is mounted in an engine room of a vehicle such as an electric vehicle (HEV or PEV) and uses carbon dioxide (CO ₂ ) as a refrigerant. The rotary compressor 10 includes a cylindrical sealed container 12, an electric element 14 housed above the inner space of the sealed container 12, and a lower housed space of the sealed container 12 and connected to the electric element 14. And a rotary compression mechanism 18 as a compressed element.

  The electric element 14 includes a stator 22 that is annularly formed along the inner peripheral surface of the upper space of the hermetic container 12, and a rotor that is rotatably provided inside the stator 22 via a slight gap (air gap). 24.

  The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. In addition, the rotor 24 includes a rotating shaft 16 that passes through the center of rotation, a laminated body 30 in which electromagnetic steel plates are laminated in the same manner as the stator 22, and a permanent magnet MG disposed in the laminated body 30.

  On the other hand, the rotary compression mechanism 18 is provided above the second rotary compression element 34 and the first rotary compression element 32 (first stage) and the second rotary compression element 34 (second stage) driven by the electric element 14. The upper support member 54 and the upper cover 66 that are disposed, the intermediate partition plate 36 that is disposed between the first rotary compression element 32 and the second rotary compression element 34, and the lower side of the first rotary compression element 32 are disposed. A lower support member 56 that also serves as a bearing for the rotary shaft 16 and a lower cover 68 are provided. Here, the excluded volume of the second rotary compression element 34 is smaller than the excluded volume of the first rotary compression element 32.

  As shown in FIG. 2, the second rotary compression element 34 includes an upper cylinder 38, an upper eccentric portion 42 that is disposed in the upper cylinder 38 and fixed to the rotary shaft 16, and is fitted to the upper eccentric portion 42. A combined upper roller 46 and an upper vane 50 that contacts the upper roller 46 and divides the inside of the upper cylinder 38 into a low pressure side and a high pressure side are provided.

  The upper cylinder 38 is formed with a suction port 161 that connects a low pressure side and a refrigerant introduction path 92 described later, and a discharge port 39 that connects a high pressure side and a discharge silencer chamber 62 described later of the upper support member 54. Yes. The suction port 161 of the upper cylinder 38 is formed with a communication hole 134 connected to a later-described through hole 131 of the intermediate partition plate 36, and oil is supplied through the communication hole 134.

  According to the second rotary compression element 34, first, the refrigerant gas is sucked into the low pressure side through the suction port 161. Then, when the upper eccentric portion 42 and the upper roller 46 are eccentrically rotated, the space where the refrigerant gas in the upper cylinder 38 is sucked is reduced. As a result, the refrigerant gas is compressed to a high pressure and is discharged through the discharge port 39 from the high pressure side.

  Returning to FIG. 1, a discharge silencing chamber 62 is provided which is formed to be recessed upward and connected to the discharge port 39 (see FIG. 2) of the upper cylinder 38. The upper support member 54 is provided with a discharge valve that opens and closes the discharge port 39.

  A bearing 54A is erected at the center of the upper support member 54, and a cylindrical bush 122 is mounted on the inner surface of the bearing 54A. The bush 122 is made of a material having good sliding properties.

  The upper cover 66 closes the discharge silencing chamber 62 of the upper support member 54. Thereby, the discharge silencing chamber 62 and the electric element 14 side in the sealed container 12 are partitioned. The upper cover 66 includes a partition portion 66A that partitions the sealed container 12, and a contact portion 66B that is provided on the outer periphery of the partition portion 66A and contacts the inner wall surface of the sealed container 12.

  The bearing 54A of the upper support member 54 passes through the partition portion 66A of the upper cover 66. The contact portion 66B is fixed to the sealed container 12 by welding and is in contact with the lower end surface of the stator 22 of the electric element 14.

  An O-ring 126 is provided between the inner peripheral surface of the upper cover 66 and the outer surface of the bearing 54A. The O-ring 126 can prevent gas leakage from the discharge silencer chamber 62 and can increase the volume of the discharge silencer chamber 62.

  The first rotary compression element 32 has the same configuration as the second rotary compression element 34, and is fixed to the rotary shaft 16 with a phase difference of 180 degrees with respect to the upper eccentric portion 42 in the lower cylinder 40 and the lower cylinder 40. A lower eccentric portion 44, a lower roller 48 fitted to the lower eccentric portion 44, a lower vane (not shown) that abuts against the lower roller 48 and divides the inside of the lower cylinder 40 into a low pressure side and a high pressure side, It has.

  The lower cylinder 40 is connected to a suction port (not shown) that connects a low-pressure side and a suction passage 60 (described later) of the lower support member 56 and a discharge (not shown) that connects a high-pressure side and a discharge silencer chamber 64 (described later) of the lower support member 56. And ports are formed.

  According to the first rotary compression element 32, first, the refrigerant gas is sucked into the low pressure side through the suction port. The space where the refrigerant gas in the lower cylinder 40 is sucked is reduced by the eccentric rotation of the lower eccentric portion 44 and the lower roller 48. As a result, the refrigerant gas is compressed to a high pressure and is discharged from the high pressure side through the discharge port.

  The lower support member 56 includes a suction passage 60 connected to the suction port of the lower cylinder 40, and a discharge silencer chamber 64 that is formed to be recessed downward and connected to the discharge port of the lower cylinder 40. . The lower support member 56 is provided with a discharge valve for opening and closing the discharge port.

  A bearing 56A is formed through the center of the lower support member 56, and a cylindrical bush 123 is mounted on the inner surface of the bearing 56A. The bush 123 is formed of a material having good slidability like the bush 122. As a result, the rotary shaft 16 is held by the bearings 54 </ b> A of the upper support member 54 and the bearings 56 </ b> A of the lower support member 56 via the bushes 122 and 123.

  The lower cover 68 closes the discharge silencing chamber 64 of the lower support member 56. The lower cover 68 is formed of a donut-shaped circular steel plate and is fixed to the lower support member 56. Further, the inner peripheral edge of the lower cover 68 protrudes inward from the inner surface of the bearing 56 </ b> A of the lower support member 56, whereby the lower end surface of the bush 123 is held by the lower cover 68.

  The intermediate partition plate 36 has a substantially donut shape, and the inner peripheral surface thereof communicates with the outer peripheral surfaces of the upper and lower eccentric portions 42 and 44. In the intermediate partition plate 36, a through hole 131 extending from the inner peripheral surface toward the outer peripheral surface, and a communication hole 133 communicating the middle of the through hole 131 with the upper end surface are formed. A sealing material 132 is press-fitted on the outer peripheral surface side of the through hole 131. The communication hole 133 is connected to the communication hole 134 of the upper cylinder 38.

  Further, the lower support member 56, the upper and lower cylinders 38 and 40, the upper support member 54, the upper cover 66, and the intermediate partition plate 36 include a discharge silencer chamber 64 of the lower support member 56 and an upper side of the upper cover 66 in the sealed container 12. A communication passage that communicates with the space is formed so as to penetrate therethrough. An intermediate discharge pipe (not shown) is erected at the upper end of the communication path, and this intermediate discharge pipe extends toward a gap between adjacent stator coils 28 wound around the stator 22 of the electric element 14. Yes. Thereby, the refrigerant gas having a relatively low temperature can be actively supplied to the electric element 14, and the temperature rise of the electric element 14 can be suppressed.

  Further, the upper support member 54 and the upper cover 66 are provided with a refrigerant introduction path 92 that communicates the suction port 161 of the upper cylinder 38 with the electric element 14 side in the sealed container 12.

  The upper and lower cylinders 38 and 40, the intermediate partition plate 36, the upper and lower part supporting members 54 and 56, and the upper and lower part covers 66 and 68 are fastened from above and below by four main bolts 128 and main bolts 129, respectively. That is, the main bolt 128 is inserted from the upper cover 66 side, and the tip thereof is screwed into the lower support member 56. The main bolt 129 is inserted from the lower cover 68 side, and the tip thereof is screwed into the upper support member 54.

  An oil hole 80 extending along the axial direction and oil supply holes 82 and 84 extending from the middle of the oil hole 80 and extending in the direction intersecting the axial direction are formed in the rotary shaft 16. The oil supply holes 82 and 84 extend to the outer peripheral surfaces of the upper and lower eccentric portions 42 and 44 of the rotary compression elements 32 and 34.

  An oil pump 99 is provided at the lower end of the rotating shaft 16. The bottom of the sealed container 12 is an oil reservoir, and the oil pump 99 draws oil from the oil reservoir. The pumped oil rises through the oil hole 80, passes through the oil supply holes 82 and 84, and is supplied to the sliding portions of the upper and lower eccentric parts 42 and 44, the first rotary compression element 32, and the second rotary compression element 34. The This prevents wear and seals of the upper and lower eccentric parts 42, 44, the first rotary compression element 32, and the second rotary compression element 34.

  Specifically, as will be described later, the inside of the sealed container 12 is at an intermediate pressure and is lower than that in the upper cylinder 38. However, the oil is pumped up from the oil reservoir at the inner bottom of the sealed container 12 and rises through the oil hole 80, and the oil supply holes 82, 84, the through hole 131 of the intermediate partition plate 36, the communication hole 133, and the communication of the upper cylinder 38. The gas is supplied to the suction port 161 of the upper cylinder 38 through the hole 134.

As the refrigerant, carbon dioxide (CO ₂ ), which is a natural refrigerant that is friendly to the global environment, is used in consideration of flammability and toxicity. As the oil (lubricating oil), existing oils such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, or PAG (polyalkylene glycol) are used.

  The hermetic container 12 is made of a material containing Al as a main component, Si of 1 wt% to 12 wt%, Mg of 2 wt% or less, and Cu of 0.5 wt% to 5 wt% of T6 treatment. Has been made.

  The sealed container 12 includes a substantially cylindrical container main body 12A having an opening 12C formed at the upper end surface and closed at the lower end surface, and an end cap 12B as a substantially disk-shaped lid member for closing the opening 12C of the container main body 12A. It is comprised including. The electric element 14 and the rotary compression mechanism 18 are accommodated in the container body 12A.

  Of the outer peripheral surface of the container body 12A, the opening 12C side and the lower end surface side to which a refrigerant introduction pipe 94 and a refrigerant discharge pipe 96 described later are connected are formed thick. Further, the edge of the opening 12C is formed thin.

  The central portion of the end cap 12B is thick, and a circular mounting hole 12D is formed in the central portion. A disk-shaped terminal 20 that closes the mounting hole 12D is bolted to the end cap 12B. An electrical terminal 139 (wiring is omitted) for supplying power to the electric element 14 is fixed to the terminal 20 through. Further, an attachment portion 20B extending inside the edge of the opening 12C of the container body 12A is formed at the edge of the end cap 12B. A substantially C-shaped backing member 70 is fitted inside the mounting portion 20B.

  A refrigerant introduction hole 94A and a refrigerant discharge hole 96A are formed on the outer surface of the container body 12A of the sealed container 12. A refrigerant introduction pipe 94 is attached to the refrigerant introduction hole 94A, and a refrigerant discharge pipe 96 is attached to the refrigerant discharge hole 96A.

  The refrigerant introduction tube 94 and the refrigerant discharge tube 96 include a cylindrical sleeve 151 and a flange 152 formed at the tip of the sleeve 151. The flange 152 is fixed to the outer surface of the container main body 12 </ b> A with a bolt 153.

  Further, the suction passage 60 of the lower support member 56 is disposed to face the refrigerant introduction hole 94A, and the discharge silencer chamber 62 of the upper support member 54 is disposed to face the refrigerant discharge hole 96A. A copper pipe 141 extending toward the refrigerant introduction hole 94A and the refrigerant discharge hole 96A is fitted in the suction passage 60 and the discharge silencer chamber 62. Further, a cylindrical collar member 142 is driven inside the copper pipe 141, and the base end side of the collar member 142 is connected to the refrigerant introduction pipe 94 and the sleeve 151 of the refrigerant discharge pipe 96. . A gap between the collar member 142 and the sleeve 151 of the refrigerant introduction pipe 94 and the refrigerant discharge pipe 96 is sealed with an O-ring 154.

  The above rotary compressor 10 is assembled in the following procedures. (ST1) The hermetic container 12 is formed of a material containing Al as a main component, Si containing 1 wt% to 12 wt%, Mg containing 2 wt% or less, and Cu containing 0.5 wt% to 5 wt%. . After the T6 treatment is performed on the sealed container 12, electrodeposition coating is performed as a rust prevention treatment.

  (ST2) The electric element 14 and the rotary compression mechanism 18 are shrink-fitted into the container body 12A. Specifically, first, the electric element 14 and the rotary compression mechanism portion 18 are assembled, the rotary compression mechanism portion 18 is attached to the rotary shaft 16 of the electric element, and the electric element 14 and the rotary compression mechanism portion 18 are integrated. .

  Next, the container main body 12A is heated, and the integrated electric element 14 and rotary compression mechanism portion 18 are inserted into the heated container main body 12A. At this time, the discharge silencing chamber 62 of the upper support member 54 is disposed so as to correspond to the refrigerant discharge hole 96A, and the suction passage 60 of the lower support member 56 is disposed to correspond to the refrigerant introduction hole 94A. Thereafter, by cooling the container body 12A, the outer peripheral surfaces of the stator 22, the upper support member 54, and the lower support member 56 of the electric element 14 are held by the inner peripheral surface of the container body 12A.

  (ST3) As shown in FIG. 3, the backing member 70 is mounted inside the attachment portion 20B of the end cap 12B, the opening 12C of the container body 12A is closed with the end cap 12B, and the opening 12C of the container body 12A is closed. The thin-walled portion of the edge and the end cap 12B are welded.

  (ST4) The copper pipe 141 is fitted into the suction passage 60 of the lower support member 56 and the discharge silencer chamber 62 of the upper support member 54, and the collar member 142 is driven into the copper pipe 141. Thereafter, the refrigerant introduction pipe 94 and the refrigerant discharge pipe 96 are attached to the outer surface of the container body 12A.

  Next, the operation of the rotary compressor 10 will be described. First, when the stator coil 28 of the electric element 14 is energized via the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. As a result, the upper and lower rollers 46 and 48 of the rotary compression elements 32 and 34 eccentrically rotate in the upper and lower cylinders 38 and 40 via the rotary shaft 16 and the upper and lower eccentric parts 42 and 44.

  Then, the low-pressure (first-stage suction pressure LP: 4 MPaG) refrigerant gas in the refrigerant introduction pipe 94 is drawn into the rotary compressor 10. Specifically, the refrigerant gas is sucked into the low pressure side of the first rotary compression element 32 via the suction passage 60 of the lower support member 56 and the suction port of the lower cylinder 40 of the first rotary compression element 32. The sucked low-pressure refrigerant gas is compressed by the operation of the lower roller 48 and the lower vane of the first rotary compression element 32 to become a refrigerant gas having an intermediate pressure (first-stage discharge pressure MP1: 8 MPaG). This intermediate-pressure refrigerant gas passes through the discharge port of the lower cylinder 40, the discharge silencer chamber 64 of the lower support member 56, the communication path, and the intermediate discharge pipe from the high-pressure chamber side of the first rotary compression element 32, and the sealed container 12. It is discharged inside.

  The intermediate pressure refrigerant gas in the hermetic container 12 passes through the refrigerant introduction path 92, the suction passage of the upper support member 54, and the suction port 161 of the upper cylinder 38 of the second rotary compression element 34. (Second stage suction pressure MP2: 8 MPaG). The sucked intermediate-pressure refrigerant gas is further compressed by the operation of the upper roller 46 and the upper vane 50 of the second rotary compression element 34 to become a high-temperature and high-pressure (second-stage discharge pressure HP: 12 MPaG) refrigerant gas. . This high-pressure refrigerant gas is discharged from the high-pressure chamber side of the second rotary compression element 34 to the refrigerant discharge pipe 96 via the discharge port 39 of the upper cylinder 38 and the discharge silencer chamber 62 of the upper support member 54.

  Therefore, according to this embodiment, there are the following effects. Since the hermetic container 12 is electrodeposited as an anticorrosive treatment, even if the hermetic container 12 is formed of a material mainly composed of aluminum and containing a large amount of Cu, the hermetic container 12 can be prevented from corroding. Therefore, the sealed container 12 can be made to have high rigidity and high corrosion resistance.

  Since the rust prevention treatment is electrodeposition coating, the surface of the sealed container 12 can be uniformly treated, and the corrosion of the sealed container 12 can be reliably prevented as compared with the case of spray coating.

  The hermetic container is formed of a material containing Al as a main component, Si containing 1 wt% or more and 12 wt% or less, Mg containing 2 wt% or less, and Cu containing 0.5 wt% or more and 5 wt% or less. Since it performed, the rigidity of the airtight container 12 can further be improved.

  As an aluminum material forming a sealed container, No. 1 as shown in Table 1 was used. 1 and no. Two test pieces were used. These test pieces were subjected to a salt spray test in which a saline solution was sprayed and a fatigue test. The salt spray test was evaluated by visual appearance.

  The above test pieces were evaluated. No. The test piece 1 had high rigidity but low corrosion resistance. On the other hand, no. The test piece 2 had low rigidity but high corrosion resistance. Therefore, in order to obtain a highly rigid and highly corrosion-resistant sealed container, the sealed container has a high Cu content. It has been found that it is appropriate to form the material of composition 1 and to perform electrodeposition coating.

  Note that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope in which the object of the present invention can be achieved are included in the present invention.

  Moreover, in each said embodiment, although the rotary compressor 10 was made into the two-stage compression type, it is not restricted to this. That is, the rotary compressor may be a single-stage (one-stage) compression type or a three-stage or more compression type. A single-stage compression rotary compressor has a configuration in which, for example, a refrigerant is introduced from the outside, the introduced refrigerant is compressed by a compression element, discharged into a sealed container, and the refrigerant is discharged from the sealed container to the outside.

It is a longitudinal section showing the compressor concerning a 1st embodiment of the present invention. It is a plane cross section of the 2nd rotation compression element which constitutes the compressor concerning the embodiment.

Explanation of symbols

10 Rotary compressor (compressor)
12 Sealed container 14 Electric element 18 Rotary compression mechanism (compression element)

Claims (3)

An electric element, a compression element coupled to the electric element, and a sealed container that accommodates the electric element and the compression element therein, and the sealed container is formed of a material mainly composed of aluminum, A compressor that compresses and discharges the introduced refrigerant by driving the compression element with an electric element,
The compressor is characterized in that the sealed container is subjected to rust prevention treatment.   The compressor according to claim 1, wherein the rust prevention treatment is electrodeposition coating.   The sealed container is made of a material containing Al as a main component, Si containing 1 wt% or more and 12 wt% or less, Mg containing 2 wt% or less, and Cu containing 0.5 wt% or more and 5 wt% or less. The compressor according to claim 1 or 2, wherein the compressor is provided.

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