JP2019199997A - Compressor and refrigeration cycle device - Google Patents

Abstract

To provide a compressor of which pressure resistance is increased at low cost in a refrigeration cycle using a high-pressure refrigerant.SOLUTION: A compressor includes: a compressor body 30 having a compression mechanism part provided therein; an accumulator 10 disposed on the lateral side of the compressor body 30, comprising a steel plate and having a cylindrical part; a suction pipe 20 for connecting a through hole provided at a lower end of the accumulator 10 and a suction port of the compression mechanism part; and a cylindrical reinforcement member 17 covering the outer peripheral surface of the cylindrical part of the accumulator 10. The tensile strength of the reinforcement member 17 is equal to or greater than that of the steel plate.SELECTED DRAWING: Figure 3

Description

 Embodiments described herein relate generally to a compressor and a refrigeration cycle apparatus.

 As a compressor provided in a refrigeration cycle apparatus such as an air conditioner, a compressor in which a compressor body and an accumulator are connected by a suction pipe is known. Conventionally, when a high pressure refrigerant such as CO2 (R744) is used, it has been necessary to increase the thickness of the accumulator sealing case in order to ensure the pressure resistance of the accumulator. In some cases, a reinforcing member is attached to the outer peripheral surface of the accumulator to increase the pressure resistance.

JP 11-280651 A

 However, when the thickness of the sealed case is increased, the cost increases with the recent increase in the price of materials. Further, when the reinforcing member is used, the reinforcing member can be divided as in Patent Document 1, and the effect of improving the pressure strength is limited.

  The problem to be solved by the present invention is to provide a compressor having a high pressure resistance at a low cost in a refrigeration cycle using a refrigerant having a high pressure.

 In order to achieve the above object, a hermetic compressor according to an embodiment includes a compressor main body having a compression mechanism portion therein, an accumulator that is disposed on a side of the compressor main body, is made of a steel plate, and has a cylindrical portion; A suction pipe that connects the accumulator and the suction hole of the compression mechanism portion, and a cylindrical reinforcing member that covers an outer peripheral surface of the cylindrical portion of the accumulator, and the tensile strength of the material of the reinforcing member is the steel plate Equal or better.

It is a figure which shows the internal structure of the hermetic compressor by this embodiment, and a refrigeration cycle block diagram. It is a top view for demonstrating the structure of the compression mechanism part by the embodiment. It is a front view of the hermetic compressor by the embodiment. It is AA sectional drawing of FIG. 3 by the same embodiment. It is a top view of the principal part by the embodiment.

Hereinafter, embodiments for carrying out the invention will be described.
The hermetic compressor 1 of the present embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 shows the internal structure of the hermetic compressor 1 and the refrigeration cycle.

 The refrigeration cycle apparatus 1 of the present embodiment includes a hermetic compressor 3 (hereinafter referred to as a compressor), a condenser 4 that is a radiator, an expansion device 5, and an evaporator 6 that is a heat absorber. Are connected in order. The compressor 3 compresses the gas refrigerant, and the condenser 4 condenses the high-temperature and high-pressure gas refrigerant discharged from the compressor 3 into a liquid refrigerant. The expansion device 5 is a decompressor that decompresses the refrigerant. The evaporator 6 evaporates the liquid refrigerant into a gas refrigerant.

The compressor 3 includes a compressor body 30 and an accumulator 10. The compressor body 30 includes a sealed case 31, a motor part 32 provided on the upper side of the sealed case 31, and a compression mechanism part 33 provided on the lower side. The motor part 32 and the compression mechanism part 33 are rotated. They are connected via a shaft 36. Lubricating oil 58 for lubricating the compression mechanism 33 is stored in the sealed case 31.
In the following description, the extending direction of the rotating shaft 36 is referred to as an axial direction, and the direction orthogonal to the rotating shaft 36 is referred to as a radial direction.

 The electric motor unit 32 includes a stator (stator) 34 fixed in the sealed case 31 and a rotor (rotor) 35 fixed to the rotation shaft 36. The rotating shaft 36 is provided with an eccentric portion 37 on the compression mechanism portion 33 side.

 The compression mechanism unit 33 includes a cylinder 40 that is fixed to the sealed case 31. The cylinder 40 has a cylindrical shape, a main bearing 41 is provided on the upper end surface, and a sub bearing 42 is provided on the lower end surface, and each cylinder 40 is fixed to the cylinder 40.

 A cylinder chamber 43 is formed by the cylinder 40, the main bearing 41, and the auxiliary bearing 42. A suction hole 44 communicating with the cylinder chamber 43 is formed in the cylinder 40. The suction pipe 20 is connected to the suction hole 44 of the cylinder 40. The refrigerant is taken into the cylinder chamber 43 from the accumulator 10 to be described later through the suction pipe 20 and the suction hole 44.

 The rotary shaft 36 is provided through the cylinder chamber 43 and is rotatably supported by the main bearing 41 and the sub bearing 42. An eccentric portion 37 is formed in a portion of the rotary shaft 36 located in the cylinder chamber 43. A roller 45 is fitted to the eccentric part 37. The roller 45 is arranged so that the outer peripheral surface of the roller 45 rotates eccentrically while being in line contact with the inner peripheral surface of the cylinder 40 through an oil film as the rotary shaft 36 rotates.

 A blade groove 46 is formed in the cylinder 40. A blade 47 is provided in the blade groove 46. The blade 47 is urged toward the cylinder chamber 43 by an urging means (not shown), and the tip of the blade 47 is in contact with the outer peripheral wall of the roller 45 in the cylinder chamber 43. As a result, the blade 47 is configured to be able to reciprocate in the cylinder chamber 43 in accordance with the rotation operation of the roller 45. The cylinder chamber 43 is partitioned by a roller 45 and a blade 47 into a suction chamber 43a side and a compression chamber 43b side. The compression operation is performed in the cylinder chamber 43 by the rotation operation of the roller 45 and the reciprocation operation of the blade 47.

On the inner peripheral surface of the cylinder 40, a discharge groove 48 is formed in a portion located on the front side of the blade groove 46 along the rotation direction of the roller 45. The discharge groove 48 communicates with a discharge hole 49 formed in the main bearing 41.
The main bearing 41 is provided with a muffler 50 through which gas refrigerant is discharged from the discharge holes 49 so as to cover the main bearing 41. The muffler 50 is formed with a communication hole 51 that allows the inside of the muffler 50 and the inside of the sealed case 31 to communicate with each other. A discharge pipe 38 that penetrates in the axial direction and communicates with the refrigerant pipe 2 is provided in the upper portion of the compressor body 30. The gas refrigerant in the sealed case 31 that has passed through the communication hole 51 is discharged from the discharge pipe 38 to the refrigerant pipe 2.

 The accumulator 10 disposed beside the compressor body 30 includes a cylindrical sealed case 11 made of a hot-rolled steel plate (SPHE, hereinafter referred to as a steel plate). In general, if the accumulator 10 is about φ60, the plate thickness is about 2 mm. Also in the compressor 3 of this embodiment, the plate | board thickness of the steel plate which comprises the airtight case 11 of the accumulator 10 shall be 2 mm. The tensile strength representing the pressure strength of the steel plate is 0.4 GPa. The steel plate is not limited to SPHE, and other iron materials may be used.

 The sealed case 11 is formed by fitting the respective opening portions 13a and 13b of the two cup-shaped members 11a and 11b. As shown in FIG. 1, the side opposite to the opening portions 13a and 13b of the cup-shaped members 11a and 11b, that is, the upper end side and the lower end side of the sealed case 11 are substantially spherical. The side surfaces of the cup-shaped members 11 a and 11 b are cylindrical surfaces and include cylindrical portions 12 a and 12 b that form the cylindrical portion 12 of the accumulator 10.

 The upper cup-shaped member 11 a is provided with an inlet pipe 14 that vertically communicates with the upper end of the accumulator 10, and the inlet pipe 14 is connected to the refrigerant pipe 2. The lower cup-shaped member 11b is provided with a through hole 15 at the lower end.

 FIG. 3 is a front view of the compressor 3. As shown in FIGS. 3 and 5, an iron band 16 circumscribing the cylindrical portion 12a is wound around the upper cup-shaped member 11a. The band 16 is fixed by welding to an accumulator holder 39 provided on the outer peripheral surface of the compressor body 30. Therefore, the accumulator 10 is fixed to the compressor body 30 via the band 16.

 The lower cup-shaped member 11b is provided with a cylindrical reinforcing member 17 that circumscribes the cylindrical portion 12b. As shown in FIG. 4, the reinforcing member 17 circumscribes the entire circumference of the cylindrical portion 12 of the accumulator 10. The reinforcing member 17 has a thickness of about 2 mm, and is substantially the same thickness as the steel plate constituting the sealed case 11 of the accumulator 10. The reinforcing member 17 is made of an aramid fiber that is a high-strength and high-modulus fiber. The tensile strength of the aramid fiber used in this embodiment is 2.9 Gpa. The reinforcing member 17 only needs to secure the pressure resistance required for the accumulator 10, and the thickness thereof may be thinner than that of the steel plate.

 A method for attaching the reinforcing member 17 will be described. Aramid fiber is a resin material. The reinforcing member 17 opened in a cylindrical shape has an inner diameter slightly larger than the outer diameter of the accumulator 10. The reinforcing member 17 is covered from the upper end side of the accumulator 10 and lowered to the cylindrical portion 12 of the accumulator 10. In this state, a slight gap is generated between the reinforcing member 17 and the accumulator 10. When the operation of the refrigeration cycle apparatus 1 starts, the refrigerant circulated through the refrigerant pipe 2 is sucked into the accumulator 10, the pressure in the accumulator 10 increases, and the accumulator 10 expands. As a result, the reinforcing member 17 is pressure-bonded to the accumulator 10. The upper end side and the lower end side of the accumulator 10 are substantially spherical, and the side surfaces are cylindrical surfaces. When the pressure in the accumulator 10 increases, the side surface, which is a cylindrical surface, easily swells. By providing the reinforcing member 10 at this position, the accumulator 10 can be prevented from being damaged.

 An attachment pipe 29 for fixing the suction pipe 20 is fixed to the side portion of the compressor body 30 in a radial direction. The suction pipe 20 is substantially L-shaped and includes an internal pipe 21, a connecting pipe 23, and a connecting pipe 22.

 The inner tube 21 is disposed in the accumulator 10. The inner pipe 21 is vertically arranged and the lower end communication portion 21a is fitted into the through hole 15. In this fitted state, the inner pipe 21 is fixed to the lower cup-shaped member 11b.

  The connecting pipe 22 is inserted into a through hole 25 provided in the sealed case 31 in a state where the connecting portion 22 a is disposed on the outer side in the radial direction of the compressor body 30.

  One end of the connecting tube 23 is fitted into the connecting portion 21 a of the inner tube 21, the other end is fitted into the connecting portion 22 a of the connecting tube 22, and the connecting tube 23 connects the inner tube 21 and the connecting tube 22. Yes. Therefore, the suction pipe 20 including the inner pipe 21, the connecting pipe 23, and the connection pipe 22 connects the accumulator 10 and the suction hole 44 of the compression mechanism portion 33. Since the cylinder 40 in which the suction hole 44 is formed is fixed to the sealed case 31, the sealed case 31, the suction pipe 20, and the accumulator 10 are integrated. One end of the suction pipe 20 opens to an upper position inside the accumulator 10, and the other end of the suction pipe 20 communicates with the suction hole 44 of the compression mechanism portion 33.

  A CO 2 refrigerant (R744) is sealed in the compressor 3 configured as described above. When the electric power is supplied to the stator 34 of the electric motor unit 32, the rotating shaft 36 rotates together with the rotor 35. As the rotation shaft 36 rotates, the eccentric portion 37 and the roller 45 rotate eccentrically in the cylinder chamber 43. As a result, the gas refrigerant is taken into the cylinder chamber 43 and the gas refrigerant taken into the cylinder chamber 43 is compressed.

  Specifically, first, the gas refrigerant is sucked from the suction hole 49 into the suction chamber 43 a located on the suction hole 49 side of the cylinder chamber 43. At that time, the gas refrigerant previously sucked from the suction hole 49 is compressed in the compression chamber 43b located on the discharge groove 48 side.

  The compressed gas refrigerant is discharged into the muffler 50 through the discharge groove 48 and the discharge hole 49. The inside of the muffler 50 and the inside of the sealed case 31 are communicated with each other through the communication hole 51, and the gas refrigerant is discharged from the cylinder chamber 43 into the sealed case 31 through the discharge hole 44 and the communication hole 51. The gas refrigerant discharged into the sealed case 31 is sent from the discharge pipe 38 to the condenser 4 through the pipe 9 as described above.

  The refrigerant that enters the accumulator 10 through the refrigerant pipe 2 includes gas refrigerant vaporized by the evaporator 6 and liquid refrigerant that has not been vaporized. In the accumulator 10, only the gas refrigerant enters the inner pipe 21, passes through the connecting pipe 22 and the connecting pipe 23, and is sent to the compressor body 30. The suction pipe 20 enters the suction chamber 43a through the suction hole 44 of the compression mechanism 33, and the above operation is repeated.

  Since the pressure of the CO2 refrigerant is high, it is necessary to increase the pressure strength of each component as compared with the refrigeration cycle apparatus using the HFC refrigerant. In the accumulator 10 according to the present embodiment, an aramid fiber reinforcing member 17 is provided on the easily deformable cylindrical portion 12 of the accumulator 10. The tensile strength of the steel plate constituting the sealed case 11 of the accumulator 10 is 0.4 GPa, whereas the tensile strength of the aramid fiber is 2.9 GPa, and the aramid fiber is a material excellent in strength.

  In order to reduce vibration and noise, a rubber member (CR rubber) may be attached to the cylindrical portion 12 of the accumulator 10 over the entire circumference. Usually, this rubber member has a tensile strength of about 0.01 GPa, which is much smaller than the steel plate constituting the accumulator 10, and the rubber member does not play a role as a reinforcing member.

  In the present embodiment, by setting the tensile strength of the material of the reinforcing member 17 to be equal to or higher than the tensile strength of the steel plate, even if the thickness of the reinforcing member 17 is thinner than the thickness of the steel plate, the pressure resistance required for the accumulator 10 is increased. It was assumed that strength could be secured. For example, in order to obtain the same pressure resistance as the accumulator 10 having a steel plate thickness of 4 mm, the reinforcing member 17 can be 2 mm or less even if the steel plate thickness is 2 mm. In particular, since the aramid fiber is a material having excellent strength, the reinforcing member can be made thinner. Compared to increasing the plate thickness of the steel plate to ensure the pressure strength, the use of the thin reinforcing member 17 allows the accumulator 10 to have a high pressure strength at a low cost.

  Conversely, when the tensile strength of the material of the reinforcing member 17 is smaller than the tensile strength of the steel plate and the steel plate is 2 mm, in order to obtain the same pressure resistance as the accumulator having a steel plate thickness of 4 mm, the thickness of the reinforcing member 17 It is necessary to thicken. It becomes difficult to attach the reinforcing member 17 to the accumulator 10, and depending on the thickness, it is necessary to widen the gap between the compressor body 30 and the accumulator 10. Accordingly, the suction pipe 20 that connects the accumulator holder 39 or the accumulator 10 and the compression mechanism 33 must be formed long in the radial direction.

  From the above, by using the thin reinforcing member 17 with the tensile strength of the material of the reinforcing member 17 being equal to or higher than the tensile strength of the steel plate, the accumulator 10 is not expanded without widening the gap between the compressor body 30 and the accumulator 10. Can be fixed to the compressor body 30.

  The reinforcing member 17 is cylindrical and has no break in the middle. That is, two or more parts are not combined and fixed in a cylindrical shape, but are integrally formed in a cylindrical shape, so there is no locally weak portion and the accumulator 10 is reinforced strongly. Yes. Further, when the refrigeration cycle apparatus 1 is operated and the inside of the accumulator 10 becomes high pressure, the load applied from the outer peripheral surface of the accumulator 10 to the inner peripheral surface of the reinforcing member 17 is evenly distributed. Can keep.

  A structure in which the sealed case 11 of the accumulator 10 is formed by combining two cup-shaped members 11a and 11b, and an iron band 16 for fixing to the compressor body 30 is wound around the cylindrical portion 12b of the upper cup-shaped member 11a. did. The band 16 is welded and fixed to the accumulator holder 39 of the compressor body 30. The band 16 can ensure the pressure resistance of the cup-shaped member 11 a on the upper side of the accumulator 10.

  On the other hand, the lower cup-shaped member 11b is not fixed to the compressor body 30 by winding an iron band like the upper cup-shaped member 11a, and therefore the cylindrical portion 12b having a low strength due to the pressure in the accumulator 10 is used. Is easy to deform. Therefore, the pressure-resistant strength of the lower cup-shaped member 11b can be increased by providing the cylindrical portion 12b with the reinforcing member 17 made of an aramid fiber. Since the upper cup-shaped member 11a is fixed by the band 16, it is not necessary to provide the reinforcing member 17 on both the upper and lower cup-shaped members 11a and 11b, and the cost can be reduced.

In addition, the same effect can be acquired also by the structure which wound the iron band 16 around the lower cup-shaped member 11b, was fixed to the compressor main body 30, and provided the reinforcement member 17 in the upper cup-shaped member 11a. .
Further, the reinforcing member 17 may be provided on both the upper cup-shaped member 11a and the lower cup-shaped member 11b, and the pressure resistance strength of the accumulator 10 can be increased.

  The accumulator 10 is not limited to one constituted by two cup-shaped members 11a and 11b, and may be constituted by three or more parts. Even in this case, the pressure-resistant strength of the accumulator 10 can be ensured by providing the reinforcing member 17 in the weak portion.

  Since the aramid fiber of the reinforcing member 17 is a lightweight resin material and can be folded small when not attached to the accumulator 10, the cost during transportation can be suppressed. When attaching the reinforcing member 17 to the accumulator 10, the reinforcing member 17 is passed through from the upper end side of the accumulator 10 while opening and extending in a cylindrical shape. However, the aramid fiber, which is a resin material, has elasticity and maintains its shape. Can do. Moreover, since the resin material is lightweight, the weight of the compressor 3 can be suppressed. As the reinforcing member 17, in addition to the aramid fiber, a resin material of high strength / high elastic modulus fiber such as ultra high molecular weight polyethylene fiber or PBO fiber may be used.

  Although the compressor 3 of the present embodiment includes one compression mechanism unit 33, the compressor 3 may include a plurality of compression mechanism units 33. At this time, a plurality of suction pipes 20 that connect the accumulator 10 and the suction holes 44 of the compression mechanism portions 33 may be provided.

  According to the hermetic compressor 3 of the embodiment described above, a cylinder made of a material having a tensile strength equal to or greater than that of the steel plate constituting the sealed case 31 of the accumulator 10 is formed on the cylindrical portion 12 where the pressure load of the accumulator 10 is easily applied. Since the reinforcing member 17 having the shape is provided, the pressure strength can be secured at a low cost. In this embodiment, the hermetic compressor 3 using the CO2 refrigerant is used. However, the present invention is not limited to this, and the present invention can be applied to the hermetic compressor 3 using other refrigerants. By providing the reinforcing member 17, the steel plate can be thinned, so that cost reduction and weight reduction are expected.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the invention described in the claims and their equivalents, as well as included in the scope and gist of the invention.

  DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle apparatus, 2 ... Refrigerant piping, 3 ... Sealed compressor (compressor), 4 ... Condenser, 5 ... Expansion device, 6 ... Evaporator, 10 ... Accumulator, 11 ... Sealed case, 11a ... Upper side Cup-shaped member, 11b ... Lower cup-shaped member, 12 ... Cylindrical portion, 16 ... Band, 17 ... Reinforcing member, 20 ... Suction pipe, 21 ... Inner pipe, 22 ... Connection pipe, 23 ... Connection pipe, 30 ... Compression Machine body 32 ... Electric motor part 33 ... Compression mechanism part 39 ... Accumulator holder

Claims (5)

A compressor body provided with a compression mechanism inside;
An accumulator disposed on the side of the compressor body, made of a steel plate and having a cylindrical portion,
A suction pipe connecting the accumulator and the suction hole of the compression mechanism;
A cylindrical reinforcing member that covers the outer peripheral surface of the cylindrical portion of the accumulator,
The material of the reinforcing member is a hermetic compressor whose tensile strength is equal to or greater than that of the steel plate.   The hermetic compressor according to claim 1, wherein a material of the reinforcing member is a resin material.   The hermetic compressor according to claim 2, wherein the resin material is an aramid fiber. The accumulator is a combination of two cup-shaped members,
One of the cup-shaped members is provided with a band fixed to the accumulator holder of the compressor main body on the outer peripheral surface of the cylindrical portion of the cup-shaped member forming the cylindrical portion of the accumulator,
The hermetic compressor according to any one of claims 1 to 4, wherein the reinforcing member is provided on the other cup-shaped member.   The hermetic compressor according to any one of claims 1 to 5, a radiator connected to the hermetic compressor, an expansion device connected to the radiator, the expansion device and the hermetic type And a heat absorber connected between the compressor and the refrigerating cycle apparatus. ?

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