JP2015017538A - Turbo compressor and turbo refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbo compressor and a turbo refrigerator which are able to reduce the labor required in the assembly of an oil supply system.SOLUTION: A turbo compressor 5 includes a lubrication oil injection nozzle 39 arranged through a housing 20 and injecting lubrication oil to a bearing 26 housed in the housing 20, and an external manifold 38 detachably attached to the housing 20 and supporting the lubrication oil injection nozzle 39 outside the housing 20.

Description

  The present invention relates to a turbo compressor and a turbo refrigerator.

  As a refrigerator, a turbo refrigerator having a turbo compressor that compresses and discharges a refrigerant by rotating an impeller with an electric motor is known. In a turbo compressor, lubricating oil is supplied from an oil tank to sliding parts such as a bearing of a rotating shaft of an electric motor and a bearing of a rotating shaft of an impeller.

  Patent Document 1 listed below discloses a turbo compressor provided with a lubricating oil supply device that supplies lubricating oil stored in an oil tank to a sliding portion. This lubricating oil supply device connects a plurality of pipes inside the housing to guide the lubricating oil to the vicinity of the sliding part, and also to the sliding part through a drill hole or the like formed in the casing by machining. It has an oil supply system that approaches and supplies lubricating oil (see FIGS. 2 and 3 of Patent Document 1).

JP 2012-207666 A

However, the conventional oil supply system has the following problems.
What connects the said piping in multiple numbers has the problem that it takes time to do complicated piping work in the narrow space inside a housing | casing. Moreover, the thing machined to the said housing | casing has the problem that it takes time and labor to process a thin and long drill hole.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a turbo compressor and a turbo chiller that can reduce the labor involved in assembling an oil supply system.

In order to solve the above-described problems, the present invention provides a lubricating oil injection nozzle that is disposed through a casing and that injects lubricating oil toward a sliding portion housed inside the casing, and the casing. A turbo compressor having a support member that is detachably attached to the body and that supports the lubricating oil injection nozzle outside the housing is employed.
By adopting this configuration, in the present invention, the lubricating oil injection nozzle is supported by a support member that is detachably attached to the outside of the housing, and the lubricating oil injection nozzle is inserted into the inside from the outside of the housing. Install the injection nozzle. Thus, in this invention, since installation of a lubricating oil injection nozzle can be completed only by inserting from the exterior of a housing | casing, the effort concerning an assembly to an oil supply system can be reduced.

Moreover, in this invention, it has a cover member which covers the said sliding site | part inside the said housing | casing, The said cover member is provided with the through-hole by which the said lubricating oil injection nozzle penetrates and is arrange | positioned. The configuration is adopted.
By adopting this configuration, in the present invention, a through hole is provided in the cover member that covers the sliding portion inside the housing, the lubricating oil injection nozzle is inserted into the through hole, and the lubricating oil injection nozzle is installed. As described above, in the present invention, by providing a through hole in the cover member in advance, the installation of the lubricating oil injection nozzle can be completed simply by being inserted from the outside of the housing.

In the present invention, the casing is formed by connecting a compressor-side casing to which the support member is attached and a motor-side casing to which the cover member is attached by a plurality of bolts. Employs a configuration in which when attached to the compressor-side casing, a flange is provided that covers the head of at least one of the plurality of bolts.
By adopting this configuration, according to the present invention, the casing cannot be separated into the compressor-side casing and the motor-side casing unless the lubricating oil injection nozzle is extracted. That is, when the lubricating oil injection nozzle is disposed through the cover member and the housing is separated in this state, the lubricating oil injection nozzle may be damaged. For this reason, in the present invention, the support member is provided with a flange portion and covers the head of the bolt that connects the compressor-side casing and the motor-side casing, so that the lubricating oil injection nozzle is separated before the casing is separated. It is essential to remove the oil and prevent the lubricant injection nozzle from being damaged.

Moreover, in this invention, the structure that the said collar part has the hook shape which can be latched to the said motor side housing | casing in the connection cancellation | release direction of the said housing | casing is employ | adopted.
By adopting this configuration, in the present invention, when the casing is to be separated without extracting the lubricating oil injection nozzle, the collar portion is locked to the motor-side casing. For this reason, in the present invention, it is possible to make the operator aware that the lubricating oil injection nozzle has not been extracted from the hooking of the flange, and more reliably prevent the lubricating oil injection nozzle from being damaged. it can.

In the present invention, a configuration is adopted in which the support member is a lubricating oil manifold having an oil supply passage communicating with at least the lubricating oil injection nozzle.
By adopting this configuration, the present invention can reduce the number of parts by using the support member as a lubricating oil manifold, and can simplify the oil supply system and contribute to cost reduction.

Further, in the present invention, the lubricating oil injection nozzle has a trunk pipe portion disposed through the casing, and a nozzle portion connected to an end of the trunk pipe portion, and the nozzle The part employs a configuration that is lighter than the body tube part.
By adopting this configuration, in the present invention, since the nozzle portion that receives the injection reaction force in the lubricating oil injection nozzle is lighter than the trunk tube portion, the occurrence of vibration due to the injection reaction force is reduced, and the lubricating oil is slid. It can be appropriately supplied to the moving site.

Further, in the present invention, the lubricating oil injection nozzle has a trunk pipe portion disposed through the casing, and a nozzle portion connected to an end of the trunk pipe portion, and the nozzle The portion is formed of a material having a specific gravity smaller than that of the body tube portion.
By adopting this configuration, in the present invention, since the specific gravity of the nozzle portion that receives the injection reaction force in the lubricating oil injection nozzle is smaller than that of the trunk tube portion, the occurrence of vibration due to the injection reaction force is reduced, and the lubricating oil is supplied. It can supply appropriately to a sliding part.

  In the present invention, the condenser that liquefies the compressed refrigerant, the evaporator that evaporates the liquefied refrigerant by the condenser and cools the object to be cooled, and the refrigerant evaporated by the evaporator A turbo refrigerator having a turbo compressor that compresses and supplies the turbo compressor to the condenser, and has the turbo compressor described above as the turbo compressor.

  ADVANTAGE OF THE INVENTION According to this invention, the turbo compressor and turbo refrigerator which can reduce the effort concerning the assembly of an oil supply system are obtained.

It is a systematic diagram of the turbo refrigerator in the embodiment of the present invention. It is a figure which shows arrangement | positioning of the lubricating oil injection nozzle in embodiment of this invention. It is an AA cross-sectional arrow view in FIG. It is a perspective view which shows the lubricating oil injection nozzle and external manifold in embodiment of this invention. It is a perspective view which shows the attachment state of the external manifold in embodiment of this invention. It is a perspective view which shows the cover member in embodiment of this invention. It is a figure for demonstrating the decomposition | disassembly operation | work and assembly operation | work of a turbo compressor in embodiment of this invention. It is sectional drawing which shows the lubricating oil injection nozzle in another embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a system diagram of a turbo refrigerator 1 in an embodiment of the present invention.
The turbo refrigerator 1 of the present embodiment uses, for example, chlorofluorocarbon as a refrigerant and air-conditioning cold water as a cooling object. As shown in FIG. 1, the turbo refrigerator 1 includes a condenser 2, an economizer 3, an evaporator 4, and a turbo compressor 5.

  The condenser 2 is connected to the gas discharge pipe 5a of the turbo compressor 5 via the flow path R1. Refrigerant (compressed refrigerant gas X1) compressed by the turbo compressor 5 is supplied to the condenser 2 through the flow path R1. The condenser 2 liquefies the compressed refrigerant gas X1. The condenser 2 includes a heat transfer pipe 2a through which cooling water flows, and cools the compressed refrigerant gas X1 by heat exchange between the compressed refrigerant gas X1 and the cooling water.

  The compressed refrigerant gas X1 is cooled by heat exchange with the cooling water, liquefied, becomes refrigerant liquid X2, and accumulates at the bottom of the condenser 2. The bottom of the condenser 2 is connected to the economizer 3 via the flow path R2. An expansion valve 6 for reducing the pressure of the refrigerant liquid X2 is provided in the flow path R2. The economizer 3 is supplied with the refrigerant liquid X2 decompressed by the expansion valve 6 through the flow path R2. The economizer 3 temporarily stores the decompressed refrigerant liquid X2, and separates the refrigerant into a liquid phase and a gas phase.

  The top of the economizer 3 is connected to the economizer connecting pipe 5b of the turbo compressor 5 through the flow path R3. The gas phase component X3 of the refrigerant separated by the economizer 3 is supplied to the turbo compressor 5 through the flow path R3 to the second compression stage 12 without passing through the evaporator 4 and the first compression stage 11, and the efficiency Is to increase. On the other hand, the bottom of the economizer 3 is connected to the evaporator 4 via a flow path R4. The flow path R4 is provided with an expansion valve 7 for further reducing the pressure of the refrigerant liquid X2.

  The evaporator 4 is supplied with the refrigerant liquid X2 further reduced in pressure by the expansion valve 7 through the flow path R4. The evaporator 4 evaporates the refrigerant liquid X2 and cools the cold water by the heat of vaporization. The evaporator 4 includes a heat transfer tube 4a through which cold water flows, and cools the cold water and evaporates the refrigerant liquid X2 by heat exchange between the refrigerant liquid X2 and the cold water. Refrigerant liquid X2 takes heat by heat exchange with cold water and evaporates to become refrigerant gas X4.

  The top of the evaporator 4 is connected to a gas suction pipe 5c of the turbo compressor 5 via a flow path R5. The refrigerant gas X4 evaporated in the evaporator 4 is supplied to the turbo compressor 5 through the flow path R5. The turbo compressor 5 compresses the evaporated refrigerant gas X4 and supplies it to the condenser 2 as the compressed refrigerant gas X1. The turbo compressor 5 is a two-stage compressor including a first compression stage 11 that compresses the refrigerant gas X4 and a second compression stage 12 that further compresses the refrigerant compressed in one stage.

  The first compression stage 11 is provided with an impeller 13, and the second compression stage 12 is provided with an impeller 14, which are connected by a rotating shaft 15. The turbo compressor 5 rotates the impellers 13 and 14 by the electric motor 10 to compress the refrigerant. The impellers 13 and 14 are radial impellers, and have blades including a three-dimensional twist (not shown) that guides the refrigerant sucked in the axial direction in the radial direction.

  An inlet guide vane 16 for adjusting the suction amount of the first compression stage 11 is provided in the gas suction pipe 5c. The inlet guide vane 16 is rotatable so that the apparent area from the flow direction of the refrigerant gas X4 can be changed. Diffuser flow paths are provided around the impellers 13 and 14, respectively, and the refrigerant derived in the radial direction is compressed and pressurized in the flow paths, and further is scrolled by a scroll flow path provided therearound. Can be supplied to the compression stage. An outlet throttle valve 17 is provided around the impeller 14 so that the discharge amount from the gas discharge pipe 5a can be controlled.

The turbo compressor 5 includes a sealed casing 20. The housing 20 is partitioned into a compression flow path space S1, a first bearing housing space S2, a motor housing space S3, a gear unit housing space S4, and a second bearing housing space S5. The casing 20 is detachably connected to the compressor side casing 20a and the motor side casing 20b.
Impellers 13 and 14 are provided in the compression flow path space S1. The rotating shaft 15 that connects the impellers 13 and 14 is provided so as to be inserted into the compression flow path space S1, the first bearing housing space S2, and the gear unit housing space S4. A bearing 21 that supports the rotary shaft 15 is provided in the first bearing housing space S2.

  In the motor housing space S3, a stator 22, a rotor 23, and a rotating shaft 24 connected to the rotor 23 are provided. The rotating shaft 24 is provided so as to be inserted into the motor housing space S3, the gear unit housing space S4, and the second bearing housing space S5. In the second bearing housing space S5, a bearing 31 that supports the non-load side of the rotating shaft 24 is provided. A gear unit 25, bearings 26 and 27, and an oil tank 28 are provided in the gear unit housing space S4.

  The gear unit 25 includes a large-diameter gear 29 that is fixed to the rotary shaft 24, and a small-diameter gear 30 that is fixed to the rotary shaft 15 and meshes with the large-diameter gear 29. The gear unit 25 transmits the rotational driving force so that the rotational speed of the rotary shaft 15 increases (increases) with respect to the rotational speed of the rotary shaft 24. The bearing 26 supports the rotating shaft 24. The bearing 27 supports the rotating shaft 15. The oil tank 28 stores lubricating oil supplied to each sliding portion such as the bearings 21, 26, 27, and 31.

  Such a casing 20 is provided with seal portions 32 and 33 for sealing the periphery of the rotary shaft 15 between the compression flow path space S1 and the first bearing housing space S2. Further, the casing 20 is provided with a seal portion 34 that seals the periphery of the rotary shaft 15 between the compression flow path space S1 and the gear unit accommodation space S4. The casing 20 is provided with a seal portion 35 that seals the periphery of the rotary shaft 24 between the gear unit accommodation space S4 and the motor accommodation space S3. Further, the casing 20 is provided with a seal portion 36 that seals the periphery of the rotary shaft 24 between the motor housing space S3 and the second bearing housing space S5.

  The oil tank 28 has an oil supply pump 37. The oil supply pump 37 is connected to an external manifold 38 (support member, lubricant oil manifold) via an oil supply path R6. The external manifold 38 has an oil supply path R7 that communicates with the lubricant injection nozzle 39 and an oil supply path R8 that communicates with the second bearing housing space S5. The lubricating oil that has passed through the oil supply path R7 is supplied to the bearing 26, and after returning to the oil tank 28 after ensuring the lubricity of the sliding portion with the rotating shaft 24 and cooling it. The lubricating oil that has passed through the oil supply path R8 is supplied to the bearing 31, and after ensuring and cooling the lubricity of the sliding portion with the rotating shaft 24, returns to the oil tank 28 via the flow path R9. It comes to come.

Next, the structure of the lubricating oil injection nozzle 39 that forms the oil supply system of the turbo compressor 5 will be described with reference to FIGS.
FIG. 2 is a diagram showing the arrangement of the lubricating oil injection nozzle 39 in the embodiment of the present invention. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a perspective view showing the lubricant injection nozzle 39 and the external manifold 38 in the embodiment of the present invention. FIG. 5 is a perspective view showing an attachment state of the external manifold 38 in the embodiment of the present invention. FIG. 6 is a perspective view showing the cover member 40 in the embodiment of the present invention. FIG. 7 is a view for explaining the disassembling work and assembling work of the turbo compressor 5 in the embodiment of the present invention.

  As shown in FIG. 2, the lubricant injection nozzle 39 is disposed through the housing 20. The lubricating oil injection nozzle 39 is inserted in the horizontal direction toward the rotating shaft 24 to which the large-diameter gear 29 is connected. Around the large-diameter gear 29, a cover member 40 that suppresses the scattering of oil droplets scraped up by the rotation of the large-diameter gear 29 is provided. As shown in FIG. 1, the cover member 40 is attached to the motor-side housing 20 b of the housing 20. The cover member 40 is provided so as to cover the rotating shaft 24, the bearing 26, and the large-diameter gear 29.

  As illustrated in FIG. 6, the cover member 40 includes a flange portion 41, a groove portion 42, and a through hole 43. The flange portion 41 is a portion that is bolted to the motor-side housing 20b (see FIG. 3). The groove portion 42 is a portion for avoiding interference with the small diameter gear 30 (see FIG. 2). The through hole 43 is a portion through which the lubricating oil injection nozzle 39 is disposed. The through hole 43 has a size corresponding to the lubricating oil injection nozzle 39, can insert the lubricating oil injection nozzle 39, and scattered oil droplets are not much from the gap with the lubricating oil injection nozzle 39. Gap management is done so as not to leak.

  As shown in FIG. 3, the lubricating oil injection nozzle 39 is configured to inject lubricating oil toward the bearing 26 accommodated inside the housing 20. The lubricating oil injection nozzle 39 has a trunk pipe portion 44 disposed through the housing 20 and a nozzle portion 45 connected to an end of the trunk pipe portion 44. The trunk pipe portion 44 has a straight pipe structure and is configured such that lubricating oil can be circulated therein. The nozzle portion 45 is welded to the end portion of the trunk tube portion 44. The nozzle portion 45 has an injection port 45 a that opens obliquely toward the bearing 26. The nozzle portion 45 is designed to be lighter than the trunk tube portion 44 as a countermeasure against vibration during injection.

  The casing 20 is formed by connecting a compressor side casing 20a and an electric motor side casing 20b by a plurality of bolts 46 (see FIG. 5). The flange portion 20a1 of the compressor-side housing 20a has a coupling structure with the flange portion 20b1 of the motor-side housing 20b, and the flange portion 20a1 and the flange portion 20a1 are combined with each other with a plurality of bolts 46. By fastening, the compressor side casing 20a and the motor side casing 20b are connected. The bolt 46 is attached from the motor-side housing 20b, and a screwdriver groove (in this embodiment, a hexagonal hole) is provided in the head portion 46a.

  Returning to FIG. 3, the compressor-side housing 20a is formed with a through hole 20a2 through which the lubricant injection nozzle 39 is disposed. Around the through hole 20a2, there is provided an external manifold 38 that is detachably attached to the compressor-side casing 20a and supports the lubricant injection nozzle 39 outside the compressor-side casing 20a. The external manifold 38 branches the oil supply path R6 into an oil supply path R7 that communicates with the lubricant injection nozzle 39 and an oil supply path R8 that communicates with the second bearing housing space S5.

  As shown in FIG. 4, the external manifold 38 has a main body portion 47 and a flange portion 48. A lubricating oil injection nozzle 39 is welded to the main body 47. Thus, in this embodiment, the external manifold 38 and the lubricating oil injection nozzle 39 have an integral structure. A seal groove 49 in which an O-ring (not shown) is disposed is formed around the lubricating oil injection nozzle 39 of the main body 47 and around the hole serving as the oil supply path R6. The O-ring is of a hard metal touch, and holds the mounting posture (see FIG. 3) of the external manifold 38 with respect to the compressor-side housing 20a.

The main body 47 is provided with a plurality of through holes 50. Bolts 51 (see FIG. 3) are inserted into the through holes 50. Thus, in this embodiment, the external manifold 38 is detachably attached to the compressor-side housing 20a by the bolts 51.
A flange portion 48 is bolted to the main body portion 47. As shown in FIG. 5, when the flange portion 48 is attached to the compressor-side casing 20 a, the head portion 46 a of at least one of the plurality of bolts 46 (only one in this embodiment) is provided. It covers.

  The collar portion 48 of the present embodiment is formed from a sheet metal having a width that can cover the head portion 46 a of one bolt 46. The collar portion 48 has an L-shaped hook shape. As described above, the flange portion 48 has a shape that can be locked to the motor-side housing 20b in the connection release direction of the housing 20 (the axial direction of the rotating shaft 24 shown in FIG. 3). Specifically, the flange portion 48 has a shape that can be locked to the flange portion 20b1 of the motor-side housing 20b.

Next, with reference to FIG. 7, the disassembling work and assembling work of the turbo compressor 5 having the above configuration will be described.
First, the disassembling work of the turbo compressor 5 will be described.
In the operation of disassembling the turbo compressor 5, the turbo compressor 5 is disassembled in the order of FIG. 7 (a) → FIG. 7 (b) → FIG. 7 (c).

  Here, an external manifold 38 is attached to the compressor-side casing 20a. Further, a cover member 40 through which the lubricating oil injection nozzle 39 supported by the external manifold 38 passes is attached to the motor-side housing 20b. As described above, when the lubricant injection nozzle 39 is disposed so as to penetrate the cover member 40, the lubricant injection nozzle 39 may be damaged if the casing 20 is separated in this state (FIG. 7 ( a)).

  For this reason, in this embodiment, the collar part 48 is provided in the external manifold 38, and the casing 20 is separated by covering the head portion 46a of the bolt 46 that connects the compressor-side casing 20a and the motor-side casing 20b. Before the operation, the extraction of the lubricating oil injection nozzle 39 is essential. As shown in FIG. 5, one of the bolts 46 is disposed on the back side of the flange portion 48 provided in the external manifold 38 so that the head 46 a for screwing cannot be accessed. Therefore, the bolt 46 cannot be removed by the tool 100 unless the external manifold 38 is removed (see FIG. 7A). Thus, in this embodiment, since the motor side housing | casing 20b cannot be removed with respect to the compressor side housing | casing 20a, damage to the lubricating oil injection nozzle 39 can be prevented.

  In the present embodiment, the flange portion 48 has a hook shape that can be locked to the motor-side housing 20 b in the connection release direction of the housing 20. Therefore, when it is going to separate the housing | casing 20 in the state which does not extract the lubricating oil injection nozzle 39, the collar part 48 latches to the motor side housing | casing 20b. For this reason, in this embodiment, it is possible to make the operator aware that the lubricating oil injection nozzle 39 has not been extracted from the catch of the flange portion 48, and more reliably break the lubricating oil injection nozzle 39. Can be prevented.

As shown in FIG. 7B, after the lubricating oil injection nozzle 39 is extracted from the casing 20, the bolt 46 disposed on the back side of the flange portion 48 is turned by the tool 100, and the compressor-side casing 20a and the electric motor are rotated. The connection with the side housing 20b is released.
When the fastening of all the bolts 46 is released, the casing 20 can be separated into the compressor-side casing 20a and the motor-side casing 20b as shown in FIG. 7C.
Thus, the disassembling work of the turbo compressor 5 is completed.

Next, the assembly work of the turbo compressor 5 will be described.
In the assembling work of the turbo compressor 5, the turbo compressor 5 is assembled in the procedure of FIG. 7 (c) → FIG. 7 (b) → FIG. 7 (a). That is, the turbo compressor 5 is assembled by following the reverse procedure of the disassembling operation.

First, as shown in FIG.7 (c), the compressor side housing | casing 20a and the motor side housing | casing 20b are made to oppose. Next, as shown in FIG. 7B, the compressor-side housing 20 a and the motor-side housing 20 b are connected by a plurality of bolts 46. Finally, as shown in FIG. 7A, the lubricating oil injection nozzle 39 is inserted into the housing 20 from the outside to the inside, and the lubricating oil injection nozzle 39 is installed.
Thus, the assembly work of the turbo compressor 5 is completed.

  In the present embodiment, the lubricant injection nozzle 39 is supported on an external manifold 38 that is detachably attached to the outside of the housing 20, and the lubricant injection nozzle 39 is inserted from the outside to the inside of the housing 20. 39 is installed. Thus, in this embodiment, since the installation of the lubricating oil injection nozzle 39 can be completed simply by inserting from the outside of the housing 20, it is possible to reduce the effort required for assembling the oil supply system of the turbo compressor 5.

  In the present embodiment, the through hole 43 is provided in the cover member 40 that covers the large-diameter gear 29 and the bearing 26 inside the housing 20, and the lubricating oil injection nozzle 39 is inserted into the through hole 43, and the lubricating oil injection nozzle 39 is installed. Thus, in this embodiment, by providing the through hole 43 in the cover member 40 in advance, the installation of the lubricating oil injection nozzle 39 can be completed simply by being inserted from the outside of the housing 20.

  The lubricating oil injection nozzle 39 is supported by an external manifold 38 that branches the oil supply passage. Thus, by using the external manifold 38 as a support member for the lubricating oil injection nozzle 39, the number of parts can be reduced, and the oil supply system can be simplified to contribute to cost reduction. Further, since the pressure loss is reduced when the oil supply system is simplified, the load applied to the oil supply pump 37 is reduced, and as shown in FIG. Can be supplied with lubricating oil.

  As in this embodiment, when the injection direction of the lubricating oil is bent in the nozzle portion 45, the nozzle portion 45 receives an injection reaction force. In the present embodiment, since the nozzle portion 45 that receives the injection reaction force is formed to be lighter than the trunk tube portion 44, the occurrence of vibration due to the injection reaction force is reduced, and the lubricating oil is appropriately supplied to the bearing 26. Can do. Further, since the lubricating oil injection nozzle 39 is supported by the through hole 43 of the cover member 40 at an intermediate point thereof, the lubricating oil supply position is accurately supplied to the bearing 26 without being displaced by the injection reaction force. be able to.

  As described above, according to the above-described embodiment, the lubricating oil injection nozzle 39 that injects the lubricating oil toward the bearing 26 that is disposed through the housing 20 and accommodated in the housing 20, and the housing. By adopting a turbo compressor 5 that is detachably attached to the body 20 and has an external manifold 38 that supports the lubricating oil injection nozzle 39 outside the housing 20, it is possible to reduce the labor required for assembling the oil supply system. The pressure loss can be reduced along with the cost reduction.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, the present invention can adopt the form shown in FIG. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 8 is a cross-sectional view showing a lubricating oil injection nozzle 39 in another embodiment of the present invention.
As shown in FIG. 8, in the lubricating oil injection nozzle 39 according to another embodiment, a body pipe portion 44 and a nozzle portion 45 are coupled by a screw portion 52. According to this configuration, the trunk tube portion 44 and the nozzle portion 45 can be formed from different materials (for example, the trunk tube portion 44 is made of iron and the nozzle portion 45 is made of aluminum). Thus, by forming the nozzle portion 45 from a material having a specific gravity smaller than that of the body tube portion 44, the head of the lubricating oil injection nozzle 39 is lightened, the occurrence of vibration due to the injection reaction force is reduced, and the lubricating oil is used as a bearing. 26 can be appropriately supplied.

  For example, in the above-described embodiment, the configuration in which the sliding portion where the lubricating oil injection nozzle 39 injects the lubricating oil is the bearing 26 has been described. However, the present invention is not limited to this configuration, and the bearing 21, 27, 31 and the like may be used as the sliding portion.

  DESCRIPTION OF SYMBOLS 1 ... Turbo refrigerator, 2 ... Condenser, 4 ... Evaporator, 5 ... Turbo compressor, 20 ... Housing, 20a ... Compressor side housing, 20b ... Electric motor side housing, 26 ... Bearing (sliding part) 38 ... External manifold (support member, lubricant manifold), 39 ... lubricating oil injection nozzle, 40 ... cover member, 43 ... through hole, 44 ... body tube part, 45 ... nozzle part, 46 ... bolt, 46a ... head 48 ... Buttocks, R7 ... Refueling passage

Claims (8)

A lubricating oil injection nozzle that is disposed through the housing and injects the lubricating oil toward the sliding portion housed inside the housing;
And a support member that is detachably attached to the casing and supports the lubricant injection nozzle outside the casing. A cover member that covers the sliding portion inside the housing;
The turbo compressor according to claim 1, wherein the cover member is provided with a through hole through which the lubricant injection nozzle is disposed. The housing includes a compressor-side housing to which the support member is attached and a motor-side housing to which the cover member is attached, connected by a plurality of bolts,
3. The turbo according to claim 2, wherein the support member has a flange that covers a head of at least one of the plurality of bolts when the support member is attached to the compressor-side casing. Compressor.   4. The turbo compressor according to claim 3, wherein the flange portion has a hook shape that can be locked to the motor-side housing in a connection release direction of the housing.   5. The turbo compressor according to claim 1, wherein the support member is a lubricating oil manifold having an oil supply passage communicating with at least the lubricating oil injection nozzle. The lubricating oil injection nozzle has a trunk pipe portion disposed through the casing, and a nozzle portion connected to an end of the trunk pipe portion,
The turbo compressor according to claim 1, wherein the nozzle part is lighter than the trunk pipe part. The lubricating oil injection nozzle has a trunk pipe portion disposed through the casing, and a nozzle portion connected to an end of the trunk pipe portion,
The turbo compressor according to claim 1, wherein the nozzle portion is formed of a material having a specific gravity smaller than that of the trunk tube portion. A condenser for liquefying the compressed refrigerant;
An evaporator that evaporates the liquefied refrigerant by the condenser and cools an object to be cooled;
A turbo compressor having a turbo compressor that compresses the refrigerant evaporated by the evaporator and supplies the compressed refrigerant to the condenser;
A turbo refrigerator having the turbo compressor according to any one of claims 1 to 7 as the turbo compressor.

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