JP4973099B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor that is used in a cooling device such as an air conditioner, a hot water supply device, and the like and operates by directly sucking a refrigerant (a compressive fluid including a refrigerant) into a compression mechanism.

As a conventional compressor, for example, a scroll type electric compressor as shown in Patent Document 1 is known. As shown in FIG. 1 described in Patent Document 1, this compressor has an electric motor portion and a scroll-type compression mechanism in a housing, and a suction pipe is positioned on the outer peripheral portion of an asymmetric wrap-shaped fixed scroll. Was directly sucked into the scroll suction part.
JP 2005-155329 A

However, in the above conventional compressor, the refrigerant sucked into the scroll suction part is easily affected by the heat from the surroundings (for example, the influence of heat from the discharge chamber or the electric motor part), and further performance is deteriorated. Therefore, there was a problem that it was not possible to cope with high efficiency. In particular, when CO ₂ is used as the refrigerant, the volume change of the CO ₂ refrigerant due to heating is large, and the performance degradation is remarkable.

  In view of the above problems, an object of the present invention is to provide a compressor that suppresses heating of the directly sucked refrigerant and achieves high efficiency.

In order to achieve the above object, the present invention employs the following technical means. The compressor according to claim 1 includes a compression mechanism (20) for sucking refrigerant, a compression chamber (26) that is included in the compression mechanism (20) and compresses the sucked refrigerant, and a compression mechanism (20). ) And a compression start portion (9, 41) provided immediately before the refrigerant is compressed in the compression chamber (26), and a housing (33) that houses the compression mechanism (20), and is sucked A flow rate increasing means (6, 38) for increasing the flow rate of the refrigerant provided between the flow of the refrigerant inside the housing (33) and the compression start portion (9, 41); and the housing (33) A first introduction pipe (4, 36) for guiding the refrigerant to be sucked into the housing (33) ,
The compression mechanism (20) includes a fixed scroll (27) that is fixed to the housing (33) and includes a fixed spiral portion, and a movable scroll (24) that includes a movable spiral portion that meshes with the fixed spiral portion and forms a compression chamber (26). ) And
The entire flow rate increasing means is accommodated in a space surrounded by a fixed scroll ,
The flow rate increasing means (6, 38) communicates with the introduction flow path (5, 37) in the first introduction pipe (4, 36), and the flow passage cross-sectional area perpendicular to the refrigerant flow direction is the introduction flow path ( A second introduction pipe (6, 38) having a speed increasing flow path (7, 39) smaller than 5, 37),
The second introduction pipe (6, 38) is characterized in that it is formed of a material having higher heat insulation than the material forming the peripheral wall portion (27) .

According to the present invention, by increasing the flow rate of the refrigerant that is directly sucked, the time during which the refrigerant is heated from the surroundings is shortened, and the deterioration of the suction efficiency due to the suction overheating is suppressed to reduce the performance drop. can do. In addition, since the heat transfer area through which heat from the surroundings is transferred to the refrigerant can be reduced, it is possible to further suppress performance degradation due to suction overheating. Further, the second introduction pipe itself forms a heat insulating layer, and the effect of insulating the heat from the surroundings transmitted to the refrigerant flowing through the second introduction pipe is obtained.

The invention of the compressor according to claim 2 includes a compression mechanism (20) that sucks refrigerant, a compression chamber (26) that is included in the compression mechanism (20) and compresses the sucked refrigerant, and a compression mechanism (20). ) And a compression start portion (9, 41, 49) provided immediately before the refrigerant is compressed in the compression chamber (26), a housing (33) for storing the compression mechanism (20), and an intake Flow rate increasing means (6, 38, 46) for increasing the flow rate of the refrigerant provided between the flow of the refrigerant flowing into the housing (33) and the compression start portion (9, 41, 49). 52), and a first introduction pipe (4, 36, 43) provided outside the housing (33) and guiding the sucked refrigerant into the housing (33) ,
The compression mechanism (20) includes a fixed scroll (27) that is fixed to the housing (33) and includes a fixed spiral portion, and a movable scroll (24) that includes a movable spiral portion that meshes with the fixed spiral portion and forms a compression chamber (26). ) And
The portion located inside the housing in the flow rate increasing means is accommodated in a space surrounded by a fixed scroll ,
The flow rate increasing means (6, 38, 46, 52) communicates with the introduction flow path (5, 37, 44, 51) in the first introduction pipe (4, 36, 43) and is perpendicular to the refrigerant flow direction. A second introduction pipe (6, 38, 46, 52) having a speed increasing flow path (7, 39, 47, 53) having a smaller channel cross-sectional area than the introduction flow path (5, 37, 44, 51) is provided. ,
The second introduction pipe (6, 38, 46, 52) is characterized in that it is made of a material having higher heat insulation than the material forming the peripheral wall portion (27) .

According to the present invention, by increasing the flow rate of the refrigerant that is directly sucked, the time during which the refrigerant is heated from the surroundings is shortened, and the deterioration of the suction efficiency due to the suction overheating is suppressed to reduce the performance drop. can do. In addition, since the heat transfer area through which heat from the surroundings is transferred to the refrigerant can be reduced, it is possible to further suppress performance degradation due to suction overheating. Further, the second introduction pipe itself forms a heat insulating layer, and the effect of insulating the heat from the surroundings transmitted to the refrigerant flowing through the second introduction pipe is obtained.

According to the invention which concerns on Claim 3 , it is preferable that the said compression mechanism (20) is operated by the motor part (10). According to the present invention, it is possible to reduce the state in which the sucked refrigerant is heated by the heat radiation from the motor unit, and it can be expected that the performance deterioration is further suppressed.

According to the invention of claim 4, refrigerant sucked into the compression chamber (26) is preferably composed mainly of CO _2. According to this invention, since the volume change due to heat is large in the CO2 refrigerant, the effect of suppressing a decrease in volume efficiency due to volume expansion is great, and a remarkable effect of preventing a decrease in the performance of the compressor can be expected. In addition, since the discharge temperature of the CO ₂ refrigerant is high, the effect of shortening the time during which the refrigerant is heated from the surroundings can be expected more.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
1st Embodiment in this invention applies the compressor 1 to the heat pump type hot-water supply apparatus which boils hot-water supply water. This embodiment will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a heat pump type hot water supply apparatus including a compressor 1. FIG. 2 is a cross-sectional view showing the internal configuration of the compressor 1.

  As shown in FIG. 1, the heat pump type hot water supply apparatus is a water / refrigerant heat exchange that performs heat exchange between a compressor 1 that sucks and compresses refrigerant, hot water in a hot water storage tank, and refrigerant discharged by the compressor 1. A decompressor 70 that decompresses the refrigerant that has flowed out of the water refrigerant heat exchanger 60, an evaporator 80 that absorbs heat from outside air blown by the blower 75 and evaporates the refrigerant, and a refrigerant that has flowed out of the evaporator 80. A gas-liquid separator 90 that separates liquid refrigerant and gas-phase refrigerant to store surplus refrigerant and supplies the gas-phase refrigerant to the compressor 1, and connects them sequentially by piping to form an annular circuit Has been. The heat pump hot water supply device boils hot water by giving heat to the hot water with an amount of heat absorbed from the outside air and the amount of compression work of the compressor 1.

The refrigerant used in this embodiment is a refrigerant mainly composed of CO ₂ as an example, and is sucked and discharged by the compressor 1 and circulated in the circuit. As shown in FIG. 2, the compressor 1 is a vertical compressor in which a compression mechanism 20 is operated by a vertically placed motor unit 10 incorporated therein. The motor unit 10 and the compression mechanism 20 are accommodated in a housing 33 that constitutes a compressor body, and the housing 33 is a highly pressure-resistant sealed container that can withstand the high pressure of the refrigerant gas discharged by the compression mechanism 20. A high-pressure shell type compressor 1 is configured.

  The compression mechanism 20 includes a fixed scroll 27 that is fixed in a housing 33 and includes a fixed spiral part, and a orbiting scroll 24 that is a movable scroll including a movable spiral part that meshes with the fixed spiral part to form a compression chamber 26. A scroll compression mechanism. The fixed scroll 27 is fixed to the discharge chamber 30 side in the housing 33, and the orbiting scroll 24 as a movable member is provided so as to mesh with the fixed scroll 27 on the sliding contact surface 29.

  The compression chamber 26 is an operation chamber that sucks and compresses the refrigerant from the gas-liquid separator 90 that is one of the components of the external circuit through which the refrigerant circulates. The volume of the compression chamber 26 is enlarged or reduced, and the refrigerant can be sucked and compressed.

  Further, immediately before the refrigerant is about to be compressed in the compression chamber 26, a compression start unit 9 is provided. In other words, the compression start unit 9 is provided at a place where the orbiting scroll 24 orbits with respect to the fixed scroll 27 and the suction of the refrigerant is completed, and compression is performed from there. The compression start portion 9 is preferably a narrow space.

  The motor unit 10 includes a rotor 11 housed in a motor chamber 14 provided in a housing 33, a stator 12 surrounding the rotor 11, a coil 13, and a shaft 21 that rotates integrally with the rotor 11, And is located below the compression mechanism 20. Further, the stator 12 is fixed by being press-fitted into the inner peripheral surface of the housing 33 on the outer peripheral side of the rotor 11.

  The motor chamber 14 is provided so as to communicate with the discharge chamber 30. An oil storage chamber 32 in which lubricating oil is stored is provided below the motor chamber 14 and in the lowermost portion of the housing 33. Yes. And the pressure of the refrigerant | coolant discharged to the discharge chamber 30 acts on this lubricating oil. Since the compressor mechanism 20, particularly the fixed scroll 27, which will be described later, is in the vicinity of the motor unit 10 and the discharge chamber 30, the heat from these is easily transmitted. Therefore, the flow path for directly sucking the refrigerant from the gas-liquid separator 90 into the compression start unit 9 is in an environment where the refrigerant is easily heated, and the performance of the compressor 1 due to overheating of the sucked refrigerant for high efficiency. It is necessary to prevent the decrease.

  An eccentric portion 22 provided at the tip of the orbiting scroll 24 on the side of the orbiting scroll 24 is inserted into the anti-fixed scroll 27 side of the shaft 21 via a bearing (not shown). The orbiting scroll 24 revolves with respect to the fixed scroll 27 as the shaft 21 is driven to rotate by a rotation prevention mechanism (not shown).

  A lubricating oil passage 23 is provided inside the shaft 21. The lubricating oil accumulated in the oil storage chamber 32 passes through the lubricating oil passage 23 and is sucked up to the bearings of the shaft 21 and the compression mechanism 20 by the action of the discharged refrigerant gas. ing.

  A frame on which a bearing (not shown) that rotatably supports the shaft 21 is provided on the side of the orbiting scroll 24 in the housing 33. A back pressure chamber 25 is formed between the frame and the orbiting scroll 24.

  The fixed scroll 27 is provided with a discharge port 28 through which the refrigerant compressed in the compression chamber 26 is discharged, and a discharge chamber 30 is formed downstream of the discharge port 28. The discharge port 28 is a through hole provided in the center of the fixed scroll 27. The discharge chamber 30 is a space provided at the outlet of the discharge port 28 and includes a discharge valve 31. The discharge valve 31 has a function of preventing the high-pressure refrigerant discharged into the discharge chamber 30 from flowing back through the discharge port 28. A discharge pipe 34 communicating with the discharge chamber 30 is connected to the upper portion of the housing 33, and the discharge pipe 34 is connected to a pipe (not shown) communicating with the water / refrigerant heat exchanger 60.

  The suction pipe 2 into which the refrigerant from the gas-liquid separator 90 flows is connected to the side portion of the housing 33. The suction pipe 2 is a first introduction pipe 4 provided so as to protrude from the outer surface of the housing 33 to the outside, and a pipe that is thinner than the first introduction pipe 4 and coaxial with the first introduction pipe 4. The second introduction pipe 6 is integrated with the second introduction pipe 6. The first introduction pipe 4 includes a suction port 3 that serves as an inlet for taking in the refrigerant from the gas-liquid separator 90, and communicates with the gas-liquid separator 90 by being connected to a pipe (not shown).

  Note that the suction pipe 2 is connected to a pipe communicating with the gas-liquid separator 90, and these connections are made by welding or brazing with their ends overlapped. The same applies to the connection between the discharge pipe 34 and the pipe connected to the water refrigerant heat exchanger 60.

  The second introduction pipe 6 functions as a flow rate increasing means for increasing the flow rate of the refrigerant reaching the compression mechanism 20 from the outside of the housing 33, and after the refrigerant flowing from the gas-liquid separator 90 flows into the housing 33. It is provided up to the compression start unit 9. The range in which the flow rate increasing means is provided is in an environment where heat from the motor unit 10 and the discharge chamber 30 is easily transmitted, and the flow rate increasing means can suppress loss due to overheating. The speed increasing flow path 7 formed inside the second introduction pipe 6 communicates with the introduction flow path 5 formed inside the first introduction pipe 4. The cross-sectional area of the speed increasing flow path 7 perpendicular to the refrigerant flow direction is smaller than the cross-sectional area of the introduction flow path 5. The most downstream end portion of the second introduction pipe 6 is located at a position facing the compression start portion 9 and is preferably located at a position as close to the compression start portion 9 as possible.

  Moreover, the shape of the cross section perpendicular | vertical to the refrigerant | coolant flow direction of the 1st introduction pipe 4 and the 2nd introduction pipe 6 employ | adopts a rectangular cylinder shape, a square cylinder shape, a polygonal cylinder shape, an elliptic cylinder shape, a circular cylinder shape, etc. However, it is particularly preferable that the cross-sections are coaxial and have a cylindrical shape.

  The second introduction pipe 6 is positioned at the most downstream end in a space formed by being surrounded by the fixed scroll 27, and is almost entirely accommodated in the space. The space part communicates with the compression start part 9. An annular peripheral portion 8 located between the fixed scroll 27 and the second introduction pipe 6 is formed on the outer periphery in the radial direction of the second introduction pipe 6 (around the outer peripheral surface). The annular peripheral portion 8 is a space that surrounds the second introduction pipe 6 and functions as a heat insulating layer that suppresses heat in the housing 33 from being transmitted to the second introduction pipe 6.

  Further, the second introduction pipe 6 may be formed of a material having a higher heat insulating property than the material forming the fixed scroll 27 and the housing 33 constituting the peripheral wall portion, in other words, a material having a low thermal conductivity. preferable. For example, when the fixed scroll 27 and the housing 33 are made of iron or aluminum, the second introduction pipe 6 is preferably made of resin. By adopting this configuration, the second introduction pipe 6 itself forms a heat insulating layer, and an effect of insulating the heat from the surroundings transmitted to the suction refrigerant is obtained.

  The operation of the compressor 1 based on the above configuration will be described. When the compressor 1 drives the motor unit 10 to rotate the shaft 21 and the orbiting scroll 24 revolves, a gaseous refrigerant (hereinafter referred to as refrigerant gas) flowing from the gas-liquid separator 90 side is obtained. It flows into the suction pipe 2 through the suction port 3. Then, the refrigerant gas enters the second introduction pipe 6 from the introduction flow path 5 in the first introduction pipe 4, and the flow velocity is increased in the speed increasing flow path 7 and reaches the compression start portion 9.

  Since the refrigerant flow rate when passing through the speed increasing flow path 7 becomes faster than the refrigerant flow speed when passing through the introduction flow path 5, the time for passing through the second introduction pipe 6 is shortened and the amount of heat received from the periphery is reduced. can do. Further, since the surface area of the second introduction pipe 6 is smaller than the surface area of the first introduction pipe 4, the heat transfer area is reduced, and the amount of heat received from the periphery with respect to the refrigerant gas can be reduced. Furthermore, the annular peripheral portion 8 formed radially outward of the second introduction pipe 6 provides an effect of insulating heat from the periphery, and the amount of heat received from the periphery can be reduced.

  Then, the refrigerant gas that has reached the compression start portion 9 is compressed by being taken into the compression chamber 26 and reducing its volume. When the refrigerant gas compressed in the compression chamber 26 reaches a predetermined discharge pressure, the refrigerant gas is discharged from the discharge port 28 to the discharge chamber 30. Further, the refrigerant gas passes through the discharge pipe 34 from the discharge chamber 30 and is discharged as a high-pressure refrigerant toward the external circuit (water refrigerant heat exchanger 60).

  Further, the refrigerant gas discharged into the discharge chamber 30 acts on the lubricating oil accumulated in the oil storage chamber 32, so that the lubricating oil ascends the lubricating oil passage 23, and each bearing of the shaft 21 and the compression mechanism. Sucked up to 20 sliding contact surfaces 29, etc., lubricates the movable part.

  As described above, the compressor 1 according to this embodiment is configured so that the refrigerant introduced from the gas-liquid separator 90 flows into the inside of the housing 33 through the second introduction pipe 6 that increases the flow rate of the refrigerant and then enters the compression start portion 9. Since the flow rate of the refrigerant that is directly sucked into the compression start section 9 is increased, the time during which the refrigerant is heated from the surroundings can be shortened and loss due to overheating can be prevented. . Therefore, high efficiency of the compressor 1 can be expected.

In addition, by adopting a refrigerant mainly composed of CO ₂ whose volume change due to heat is a main component as the refrigerant accelerated by the second introduction pipe 6, a decrease in volume efficiency due to volume expansion can be suppressed, and compression A greater effect of preventing the performance degradation of the machine 1 can be expected. In addition, since the CO ₂ refrigerant has a high discharge temperature, a great effect of shortening the time during which the refrigerant is heated from the surroundings can be expected.

(Second Embodiment)
The compressor in the second embodiment differs from the compressor in the first embodiment only in the specific configuration of the flow velocity increasing means. FIG. 3 is a cross-sectional view showing the internal configuration of the compressor of this embodiment. Hereinafter, a specific configuration of the flow rate increasing means of the present embodiment will be described. In addition, the component of the same code | symbol in FIG. 3 is the same as that of the component demonstrated in 1st Embodiment, and the effect is also the same.

  As shown in FIG. 3, the first introduction pipe 36 into which the refrigerant from the gas-liquid separator 90 flows is connected to the side portion of the housing 33. A second introduction pipe that is narrower than the first introduction pipe 36 and formed separately from the first introduction pipe 36 so as to be coaxial with the first introduction pipe 36 is provided downstream of the first introduction pipe 36. A tube 38 is provided. The first introduction pipe 36 includes a suction port 35 that serves as an inlet for taking in the refrigerant from the gas-liquid separator 90, and communicates with the gas-liquid separator 90 by being connected to a pipe (not shown).

  The first introduction pipe 36 is connected to a pipe communicating with the gas-liquid separator 90, and these connections are made by welding or brazing with their ends overlapped.

  The second introduction pipe 38 functions as a flow rate increasing means for increasing the flow rate of the refrigerant flowing inside, and reaches the compression start portion 41 after the refrigerant flowing from the gas-liquid separator 90 flows into the housing 33. It is provided between. The speed increasing flow path 39 formed inside the second introduction pipe 38 communicates with the introduction flow path 37 formed inside the first introduction pipe 36. The flow passage cross-sectional area perpendicular to the refrigerant flow direction of the speed increasing flow passage 39 is formed smaller than the flow passage cross-sectional area of the introduction flow passage 37.

  The most downstream end portion of the first introduction pipe 36 and the most upstream end portion of the second introduction pipe 38 are not positioned to overlap each other, but may be arranged to overlap each other. The most downstream end of the second introduction pipe 38 is at a position facing the compression start portion 41, and is preferably located at a position as close to the compression start portion 41 as possible. The first introduction pipe 36 and the second introduction pipe 38 are preferably coaxial and have a cylindrical cross section.

  The second introduction pipe 38 has its outer peripheral portion positioned in a space portion surrounded by the fixed scroll 27 and is almost entirely accommodated in the space portion. An annular peripheral portion 40 located between the fixed scroll 27 and the second introduction tube 38 is formed around the radially outer periphery of the second introduction tube 38 (around the outer peripheral surface). The annular peripheral portion 40 is a space that surrounds the second introduction pipe 38 and functions as a heat insulating layer that suppresses heat in the housing 33 from being transmitted to the second introduction pipe 38.

  Further, the second introduction pipe 38 is made of a material having a high heat insulating property as compared with the material forming the fixed scroll 27 and the housing 33 constituting the wall portion in the vicinity thereof, like the second introduction pipe 6 of the first embodiment. In other words, it is preferably formed of a material having low thermal conductivity.

  The operation of the compressor 1 based on the above configuration will be described. When the compressor 1 drives the motor unit 10 to rotate the shaft 21 and the orbiting scroll 24 revolves, the refrigerant gas flowing from the gas-liquid separator 90 side passes through the suction port 35 and passes through the first introduction pipe. 36 flows in. Then, the refrigerant gas passes through the introduction flow path 37 and enters the speed increase flow path 39 to increase the flow velocity and reach the compression start portion 41.

  Since the refrigerant flow rate when passing through the speed increasing flow path 39 is faster than the refrigerant flow speed when passing through the introduction flow path 37, the time for passing through the second introduction pipe 38 is shortened, and the amount of heat received from the periphery is reduced. can do. In addition, since the surface area of the second introduction pipe 38 is smaller than the surface area of the first introduction pipe 36, the heat transfer area is reduced, and the amount of heat received from the periphery of the refrigerant gas can be reduced. Furthermore, the annular peripheral portion 40 formed radially outward of the second introduction pipe 38 has an effect of insulating heat from the periphery, and the amount of heat received from the periphery is reduced. The subsequent flow of the refrigerant gas and the effect of each component are the same as in the first embodiment, and are omitted here.

(Third embodiment)
The compressor in the third embodiment differs from the compressor in the first embodiment only in the specific configuration of the flow velocity increasing means. FIG. 4 is a cross-sectional view showing the internal configuration of the compressor according to this embodiment. Hereinafter, a specific configuration of the flow rate increasing means of the present embodiment will be described. In addition, the component of the same code | symbol in FIG. 4 is the same as that of the component demonstrated in 1st Embodiment, and the effect is also the same.

  As shown in FIG. 4, a first introduction pipe 43 into which the refrigerant from the gas-liquid separator 90 flows is connected to the side portion of the housing 33. A second introduction pipe that is narrower than the first introduction pipe 43 and is coaxial with the inside of the first introduction pipe 43 on the downstream side of the refrigerant flow path from the first introduction pipe 43. 46 is provided. That is, the first introduction pipe 43 and the second introduction pipe 46 are double pipes having the second introduction pipe 46 as an inner pipe. The first introduction pipe 43 is provided with a suction port 42 that serves as an inlet for taking in the refrigerant from the gas-liquid separator 90, and communicates with the gas-liquid separator 90 by being connected to a pipe (not shown).

  The first introduction pipe 43 is connected to a pipe communicating with the gas-liquid separator 90, and these connections are made by welding or brazing with their ends overlapped.

  The second introduction pipe 46 functions as a flow rate increasing means for increasing the flow rate of the refrigerant flowing inside, and reaches the compression start portion 49 after the refrigerant flowing from the gas-liquid separator 90 flows into the housing 33. It is provided between. The speed increasing flow path 47 formed inside the second introduction pipe 46 is provided downstream of the introduction flow path 44 formed inside the first introduction pipe 43. The cross-sectional area of the speed increasing channel 47 perpendicular to the refrigerant flow direction is smaller than the cross-sectional area of the introduction channel 44.

  The uppermost stream side end 45 of the second introduction pipe 46 is located inside the first introduction pipe 43 and is located outside the housing 33, that is, outside the compressor body. With this configuration, the second introduction pipe 46 is continuously provided from the outside of the housing 33 until the refrigerant from the gas-liquid separator 90 reaches the compression start portion 9. With this configuration, since the second introduction pipe 46 is formed to extend to the outside of the housing 33, the effect of increasing the flow rate of the refrigerant is enhanced. Further, the inside of the first introduction pipe 43 can be effectively used as a space for installing the second introduction pipe 46.

  The most downstream end of the second introduction pipe 46 is at a position facing the compression start portion 49, and is preferably located at a position as close to the compression start portion 49 as possible. The first introduction pipe 43 and the second introduction pipe 46 are preferably coaxial and have a cylindrical cross section.

  The second introduction pipe 46 has its outer peripheral portion positioned in a space portion surrounded by the downstream inner peripheral surface of the first introduction pipe 43, and the downstream outer peripheral portion of the second introduction pipe 46 is located in the space portion. It is stored. The space portion is an annular peripheral portion 48 formed between the inner peripheral surface of the first introduction tube 43 and the outer peripheral surface of the second introduction tube 46. The annular peripheral portion 48 is a space portion that surrounds the second introduction pipe 46 and functions as a heat insulating layer that suppresses heat in the housing 33 from being transmitted to the second introduction pipe 46.

  Further, the second introduction pipe 46 is made of a material having a high heat insulating property as compared with the material forming the fixed scroll 27 and the housing 33 constituting the peripheral wall portion, similarly to the second introduction pipe 6 of the first embodiment. In other words, it is preferably formed of a material having low thermal conductivity.

  The operation of the compressor 1 based on the above configuration will be described. When the compressor 1 drives the motor unit 10 to rotate the shaft 21 and the orbiting scroll 24 revolves, the refrigerant gas flowing from the gas-liquid separator 90 side passes through the suction port 42 and passes through the first introduction pipe. 43 flows in. Then, the refrigerant gas passes through the introduction flow path 44 and enters the acceleration flow path 47, where the flow velocity is increased and reaches the compression start portion 49.

  Since the refrigerant flow rate when passing through the speed increasing flow path 47 is faster than the refrigerant flow rate when passing through the introduction flow path 44, the time for passing through the second introduction pipe 46 is shortened, and the amount of heat received from the periphery is reduced. can do. In addition, since the surface area of the second introduction pipe 46 is smaller than the surface area of the first introduction pipe 43, the heat transfer area is reduced, and the amount of heat received from the periphery of the refrigerant gas can be reduced.

  Further, the annular peripheral portion 48 formed radially outward of the second introduction pipe 46 has an effect of insulating heat from the periphery, and the amount of heat received from the periphery is reduced. The subsequent flow of the refrigerant gas and the effect of each component are the same as in the first embodiment, and are omitted here.

(Fourth embodiment)
The compressor in the fourth embodiment differs from the compressor in the first embodiment only in the specific configuration of the flow velocity increasing means. FIG. 5 is a cross-sectional view showing the internal configuration of the compressor of the present embodiment. Hereinafter, a specific configuration of the flow rate increasing means of the present embodiment will be described. In addition, the component of the same code | symbol in FIG. 5 is the same as that of the component demonstrated in 1st Embodiment, and the effect is also the same.

  As shown in FIG. 5, a suction pipe 50 into which the refrigerant from the gas-liquid separator 90 flows is connected to the side portion of the housing 33. The suction pipe 50 includes a large-diameter pipe portion provided with a suction flow path 51 inside the upstream side thereof, and a pipe that is thinner than the large-diameter pipe section and is located downstream of the suction flow path 51. And a small-diameter pipe portion 52 provided with a fast flow path 53. The speed increasing flow channel 53 is formed so that the flow channel cross-sectional area perpendicular to the refrigerant flow direction is smaller than that of the suction flow channel 51. The suction pipe 50 is connected to a pipe communicating with the gas-liquid separator 90, and these joints are joined by welding or brazing with their ends overlapped.

  The small-diameter pipe portion 52 of the suction pipe 50 functions as a flow velocity increasing means for increasing the flow velocity of the refrigerant flowing inside. The most upstream side end of the small diameter pipe portion 52 is located outside the housing 33, and the small diameter pipe portion 52, which is a flow velocity increasing means, starts to compress the refrigerant from the gas-liquid separator 90 from the outside of the housing 33. It is provided continuously until the part 9 is reached. The most downstream end portion of the small-diameter pipe portion 52 is preferably located at a position facing the compression start portion 9 and immediately before a position as close to the compression start portion 9 as possible. Further, it is preferable that the large-diameter pipe portion and the small-diameter pipe portion 52 of the suction pipe 50 are coaxial and have a cylindrical cross section.

  The small-diameter pipe portion 52 is disposed in a space portion surrounded by the fixed scroll 27 with the outer peripheral portion on the downstream side thereof positioned. An annular peripheral portion 8 located between the fixed scroll 27 and the small diameter tube portion 52 is formed in the outer periphery in the radial direction of the small diameter tube portion 52 (the periphery of the outer peripheral surface). The annular peripheral portion 8 functions as a heat insulating layer that suppresses heat in the housing 33 from being transmitted to the small diameter pipe portion 52.

  Further, the small-diameter pipe portion 52 is made of a material having a high heat insulating property, in other words, a material having a higher heat insulating property than the material forming the fixed scroll 27 and the housing 33 constituting the wall portion around the small introduction pipe portion 6 in the first embodiment. In this case, it is preferable to form with a material having low thermal conductivity.

  In addition, about the action | operation of the compressor 1 concerning this embodiment, it is the same as that of 1st Embodiment, and this is abbreviate | omitted.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, the flow rate increasing means of the above embodiment is provided in the refrigerant flow path formed between the time when the refrigerant flowing from the gas-liquid separator 90 flows into the housing 33 and reaches the compression start portions 9, 41, 49. Although provided, the structure provided in the exterior of the housing 33 may be sufficient.

  Moreover, although the compressor concerning this invention is demonstrated as what is applied to a heat pump type hot water supply apparatus in the said embodiment, it is not limited to this, Even if it applies to the refrigerating cycle apparatus used for an air conditioning etc. Good.

  The compressor in the above embodiment is an electric compressor driven by an electric motor. However, the compressor is not limited to this, and a mechanical compressor using a driving force by an engine, or an electric motor and an engine drive are used in combination. It may be a hybrid type compressor.

  Moreover, although the compressor 1 in the said embodiment is a high-pressure shell type compressor provided with the airtight container comprised by the housing 33, a low pressure shell type compressor may be sufficient, and also it becomes a airtight container type. It is not limited, and an open structure may be used.

  Moreover, although the direction in which a refrigerant | coolant flows in from the external circuit with respect to the compressor 1 in the said embodiment is a horizontal direction, it is not limited to this, A perpendicular direction downward or upward may be sufficient. Further, in the above embodiment, the suction pipes 2 and 53 and the first introduction pipes 4, 36, and 43 are arranged on the side portion of the compressor body, but the present invention is not limited to this. It is good also as arranging.

  Moreover, although the scroll type compressor has been described as an example of the compressor in the above embodiment, the compression mechanism in the compressor of the present invention is not limited to the scroll type. For example, it may be configured by a rolling piston type compression mechanism.

  Moreover, although the compressor 1 in the said embodiment is the vertical installation structure where the rotating shaft of the rotor 11 of the motor part 10 was distribute | arranged to the substantially perpendicular direction, it is not limited to this, The said rotating shaft is substantially horizontal. It may be a horizontally placed structure arranged in the direction.

It is a schematic diagram which shows the heat pump type hot water supply apparatus containing the compressor in 1st Embodiment of this invention. It is sectional drawing which shows the internal structure of the compressor in 1st Embodiment. It is sectional drawing which shows the internal structure of the compressor in 2nd Embodiment. It is sectional drawing which shows the internal structure of the compressor in 3rd Embodiment. It is sectional drawing which shows the internal structure of the compressor in 4th Embodiment.

Explanation of symbols

4, 36, 43 ... first introduction pipe 5, 37, 44 ... introduction flow path 6, 38, 46 ... second introduction pipe (flow rate increasing means)
7, 39, 47 ... speed increasing flow path 8, 40, 48 ... annular peripheral part (space part)
9, 41, 49 ... compression start part 10 ... motor part 20 ... compression mechanism 24 ... movable scroll 26 ... compression chamber 27 ... fixed scroll (wall part)
33 ... Housing 45 ... Uppermost stream side end 52 ... Small diameter pipe (flow rate increasing means)
90 ... Gas-liquid separator (external circuit)

Claims (4)

A compression mechanism (20) for sucking refrigerant;
A compression chamber (26) included in the compression mechanism (20), in which the sucked refrigerant is compressed;
A compression start portion (9, 41) included in the compression mechanism (20) and provided immediately before the refrigerant is compressed in the compression chamber (26);
A housing (33) for housing the compression mechanism (20);
Flow rate increasing means (6, 38) provided between the time when the sucked refrigerant flows into the housing (33) and reaching the compression start portion (9, 41), and increases the flow rate of the refrigerant. When,
A first introduction pipe (4, 36) provided outside the housing (33) for guiding the sucked refrigerant into the housing (33);
With
The compression mechanism (20) includes a fixed scroll (27) that is fixed to the housing (33) and includes a fixed spiral part, and a movable spiral part that meshes with the fixed spiral part and forms the compression chamber (26). A movable scroll (24),
The whole of the flow velocity increasing means is accommodated in a space surrounded by the fixed scroll ,
The flow rate increasing means (6, 38) communicates with the introduction flow path (5, 37) in the first introduction pipe (4, 36), and the flow path cross-sectional area perpendicular to the refrigerant flow direction is the introduction flow. A second introduction pipe (6, 38) having a speed increasing flow path (7, 39) smaller than the path (5, 37);
The compressor characterized in that the second introduction pipe (6, 38) is made of a material having higher heat insulation than the material forming the peripheral wall portion (27) . A compression mechanism (20) for sucking refrigerant;
A compression chamber (26) included in the compression mechanism (20), in which the sucked refrigerant is compressed;
A compression start portion (9, 41, 49) included in the compression mechanism (20) and provided immediately before the refrigerant is compressed in the compression chamber (26);
A housing (33) for housing the compression mechanism (20);
Flow rate increasing means (6,) provided between the time when the sucked refrigerant flows into the inside of the housing (33) and reaching the compression start portion (9, 41, 49), and increases the flow rate of the refrigerant. 38, 46, 52),
A first introduction pipe (4, 36, 43) provided outside the housing (33) and guiding the sucked refrigerant into the housing (33);
With
The compression mechanism (20) includes a fixed scroll (27) that is fixed to the housing (33) and includes a fixed spiral part, and a movable spiral part that meshes with the fixed spiral part and forms the compression chamber (26). A movable scroll (24),
The portion located inside the housing in the flow rate increasing means is accommodated in a space surrounded by the fixed scroll ,
The flow rate increasing means (6, 38, 46, 52) communicates with the introduction flow path (5, 37, 44, 51) in the first introduction pipe (4, 36, 43) and in the refrigerant flow direction. A second introduction pipe (6, 38, 46, 52) having a speed increasing flow path (7, 39, 47, 53) having a perpendicular flow path cross-sectional area smaller than the introduction flow path (5, 37, 44, 51). )
The compressor characterized in that the second introduction pipe (6, 38, 46, 52) is made of a material having higher heat insulation than the material forming the peripheral wall portion (27) . The compressor according to claim 1 or 2 , further comprising a motor unit (10) for operating the compression mechanism (20). The refrigerant sucked into the compression chamber (26), the compressor according to any one of claims 1 to 3, characterized in that the main component CO _2.

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