WO2015008577A1

WO2015008577A1 - Adjustment method for shaft seal device

Info

Publication number: WO2015008577A1
Application number: PCT/JP2014/066423
Authority: WO
Inventors: 兼太郎小田; 克弥藤咲; 信義佐久間
Original assignee: 株式会社Ihi
Priority date: 2013-07-18
Filing date: 2014-06-20
Publication date: 2015-01-22
Also published as: JP5994744B2; JP2015021549A

Abstract

Provided is an adjustment method for a shaft seal device, in which V-packing is accommodated in a packing accommodation groove that has been formed in the periphery of a drive shaft and the V-packing is deformed by a pressing member that can move axially by the tightening of a bolt, thereby sealing the periphery of a drive shaft, wherein the method involves the following: a correlation measurement step (s2) in which the correlation between the tightening torque of the bolt and the sliding torque of the drive shaft with respect to the V-packing is measured; and a tightening torque management step (s3) in which the tightening torque of the bolt is managed on the basis of the correlation. Due to this configuration, an adjustment method for a shaft seal device is obtained that can eliminate work complication.

Description

Adjusting method of shaft seal device

The present invention relates to a method for adjusting a shaft seal device.
This application claims priority based on Japanese Patent Application No. 2013-149465 for which it applied to Japan on July 18, 2013, and uses the content here.

As a refrigerator, a turbo refrigerator having a turbo compressor that compresses and discharges a refrigerant by rotating an impeller by a motor is known. The turbo compressor is equipped with an IGV (inlet guide vane) as a throttle mechanism for the suction port and a DDC (Discharge Diffuser Controller) as the throttle mechanism for the discharge port, so that the intake and discharge amounts can be controlled. ing.

By the way, the control motor for driving the IGV and DDC is arranged outside the casing of the turbo compressor because it is affected by refrigerant, oil, and heat, and is provided to penetrate from the outside to the inside of the casing. The internal mechanism is driven via the drive shaft. Since compressed gas is generated inside the casing of the turbo compressor, it is necessary to prevent gas leakage through the drive shaft. For this reason, the turbo compressor includes a shaft seal device that seals around the drive shaft.

Patent Document 1 listed below discloses a shaft sealing device that seals around the valve shaft of a piston valve.
The shaft seal device includes a packing housing portion formed around the valve shaft, a gland packing filled in the packing housing portion, a packing pressing means whose tip is pressed against the gland packing, and a packing pressing means. A tightening member for holding the gland packing, and applying a load to the gland packing to deform it, thereby sealing the periphery of the valve shaft.

Patent Document 2 listed below discloses a shaft seal packing attached to a shaft seal chamber of a valve.
The shaft seal packing includes a plurality of V-shaped annular packing bodies mounted in the shaft sealing chamber, a top adapter provided above the packing body, and a bottom adapter provided below the packing body. A gland member is provided on the upper part of the shaft seal packing. The shaft seal packing is pressed from above by tightening the ground member with a bolt. In order to improve the sealing performance or to cope with the stress relaxation phenomenon, the bolt is tightened.

Patent Document 3 listed below discloses a structure in which a packing is compressed and water is stopped by tightening bolts and nuts in a joint used for a steel pipe for drainage.
When tightening the bolt, paying attention to the fact that the change in the outer peripheral length of the packing is proportional to the amount of pressure applied to the packing, the tightening torque of the bolt is appropriately managed by using the outer peripheral length of the packing as a parameter.

The following Patent Document 4 discloses a sealing device that seals between a roll shaft box and a roll shaft in a roll bearing portion of a continuous casting machine.
In this sealing device, an adapter inside the machine, a V packing inside the machine, a lantern, a V packing outside the machine, and an adapter outside the machine are sequentially inserted into an annular step formed in the roll axle box, and then pressed. It is formed by fixing the member to the end of the roll axle box using a screw. When the pressing member is fixed, each part is compressed in the axial direction between the pressing member and the end surface of the stepped portion, and the lips of the V packing and the adapter are brought into close contact with the peripheral surface of the roll shaft or the inner surface of the roll shaft box. The V-packing is tightened according to the situation of use.

Japanese Unexamined Patent Publication No. 11-166628 Japanese republished patent WO2008 / 007685 Japanese Unexamined Patent Publication No. 2013-19445 Japanese Unexamined Patent Publication No. 2003-220454

By the way, in the shaft seal device, it is necessary to make an appropriate adjustment so as not to damage the packing material and to prevent the torque of the control motor from being insufficient while maintaining airtightness. In the adjustment of the conventional shaft seal device, the control motor is removed, the spring shaft is installed on the drive shaft, etc., and the drive shaft is adjusted so that the sliding torque against the packing material becomes an appropriate value while tightening the packing. It was.

However, even if the shaft seal device is adjusted at the time of manufacturing the turbo compressor, it is affected by vibration and the like at the time of transportation. Therefore, it is necessary to adjust the shaft seal device at the turbo compressor delivery destination. Then, the adjustment work of the shaft seal device was complicated, such as removing the control motor again and installing a spring gauge on the drive shaft.

The present invention has been made in view of the above problems, and an object thereof is to provide a method for adjusting a shaft seal device that can eliminate the complexity of work.

The inventors of the present invention have conducted extensive experiments to solve the above problems, and as a result, when a V packing is used as the packing material, the torque of the bolt that tightens the V packing and the sliding torque of the drive shaft with respect to the V packing. And the present invention has been conceived.
That is, in the first aspect of the present invention, the V packing is accommodated in a packing accommodating groove formed around the drive shaft, and the V packing is deformed by a pressing member that is movable in the axial direction by tightening a bolt. A method for adjusting a shaft seal device for sealing around a shaft, the correlation measuring step for measuring the correlation between the tightening torque of the bolt and the sliding torque of the drive shaft with respect to the V packing, and the correlation And a tightening torque management step for managing the tightening torque of the bolt.
By adopting this method, the present invention measures the correlation between the tightening torque of the bolt and the sliding torque of the drive shaft, and manages the tightening torque of the bolt as a proxy, thereby reducing the sliding torque of the drive shaft. Can be managed. For this reason, in the present invention, it is not necessary to remove the control motor, install a spring measure or the like on the drive shaft, and directly manage the sliding torque of the drive shaft, thereby eliminating the complexity of adjusting the shaft seal device.

Further, a second aspect of the present invention is a method for adjusting a shaft seal device according to the first aspect, further comprising a pre-tightening step of tightening and releasing the bolts as a set before the correlation measurement step. Have.
By adopting this method, in the present invention, before measuring the correlation between the tightening torque of the bolt and the sliding torque of the drive shaft, the bolt is tightened and the tightening is released as a set. Adjustment accuracy can be improved.

According to a third aspect of the present invention, in the method for adjusting a shaft seal device according to the second aspect, in the pre-tightening step, the bolts are tightened and unfastened multiple times.
By adopting this method, in the present invention, the bolt is tightened and unfastened multiple times, the bolt is physically adapted, and the correlation between the bolt tightening torque and the driving shaft sliding torque is obtained. Reproducibility can be improved and the adjustment accuracy of the shaft seal device can be further improved.

According to a fourth aspect of the present invention, in the method for adjusting a shaft seal device according to the first to third aspects, a motor unit is connected to the drive shaft, and the tightening torque management step includes: This is performed in a state where the drive shaft and the motor unit are connected.
By adopting this method, in the present invention, since the shaft seal device is adjusted without removing the motor unit from the drive shaft, the complexity of the work can be eliminated.

According to a fifth aspect of the present invention, in the method for adjusting a shaft seal device according to the first to fourth aspects, the V packing includes a male adapter, a female adapter, the male adapter, and the female adapter. A plurality of V-shaped pieces sandwiched between the first V-packing and the first V-packing in the packing housing groove with the male adapter side facing the groove bottom. A second V-packing facing the female adapter side is accommodated on the female adapter side.
By adopting this method, in the present invention, the first V packing and the second V packing having different directions are accommodated in the packing accommodating groove, so that the bolt tightening torque and the driving shaft sliding torque can be reduced. The reproducibility of the correlation can be improved.

According to the present invention, a method for adjusting a shaft seal device that can eliminate the complexity of work can be obtained.

It is a systematic diagram of the turbo refrigerator in the embodiment of the present invention. It is a perspective view which shows the external appearance of the shaft seal apparatus in embodiment of this invention. It is sectional drawing which shows the structure of the shaft seal apparatus in embodiment of this invention. It is a flowchart which shows the adjustment method of the shaft seal apparatus in embodiment of this invention. It is a figure which shows the correlation of the bolting torque in embodiment of this invention, and the sliding torque of a drive shaft. It is a perspective view which shows the external appearance of the shaft seal apparatus 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 cools cold water for air conditioning using, for example, Freon as a refrigerant. 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 through the flow path R1. The 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 tube 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.

Compressed refrigerant gas X1 is cooled by heat exchange with cooling water, liquefied, becomes refrigerant liquid X2, and accumulates at the bottom of 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 second compression stage 12 of the turbo compressor 5 through the flow path R3 without passing through the evaporator 4 and the first compression stage 11. This increases efficiency. 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 refrigerant liquid X2 further reduced in pressure by the expansion valve 7 is supplied to the evaporator 4 through the flow path R4. The evaporator 4 evaporates the refrigerant liquid X2 and cools the cold water with 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 through 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 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.

The gas intake pipe 5c is provided with an inlet guide vane 16 for adjusting the intake amount of the first compression stage 11. The inlet guide vane 16 is rotatable so that the apparent area from the flow direction of the refrigerant gas X4 can be changed. The inlet guide vane 16 is driven by driving force transmitted from an IGV control motor unit 16a (motor unit) disposed outside the casing 20 of the turbo compressor 5.

A diffuser channel is provided around each of the

impellers

13 and 14. The refrigerant derived in the radial direction of the

impellers

13 and 14 is compressed and pressurized in the diffuser flow path, and further supplied to the next compression stage through a scroll flow path provided therearound. An outlet throttle valve 17 is provided around the impeller 14, and the discharge amount from the gas discharge pipe 5a can be controlled. The outlet throttle valve 17 is driven by a driving force transmitted from a DDC control motor unit 17a (motor unit) disposed outside the casing 20 of the turbo compressor 5.

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. 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.

The motor housing space S3 is provided with a stator 22, a rotor 23, and a rotating shaft 24 connected to the rotor 23. The rotary 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 fixed to the rotary shaft 24 and a small-diameter gear 30 fixed to the rotary shaft 15 and meshed 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 (accelerates) 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.

The 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. 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.

Next, the configuration of the shaft seal device 40 that seals the periphery of the drive shaft 41 of the inlet guide vane 16 will be described with reference to FIGS. 2 and 3.
FIG. 2 is a perspective view showing an appearance of the shaft seal device 40 in the embodiment of the present invention. FIG. 3 is a cross-sectional view showing the configuration of the shaft seal device 40 in the embodiment of the present invention.

As shown in FIG. 2, the IGV control motor unit 16 a is attached to the housing 20 via a stuffing box 42. The stuffing box 42 is formed in a trapezoidal frame shape. The lower bottom portion 42b of the stuffing box 42 is fastened and fixed to the housing 20 by a plurality of bolts 43a. The IGV control motor unit 16a is attached to the upper bottom portion 42a of the stuffing box 42 by a plurality of bolts 43b.

As shown in FIG. 3, an insertion hole 45 through which the output shaft 44 of the IGV control motor unit 16 a is inserted is formed in the upper bottom portion 42 a of the stuffing box 42.
The output shaft 44 is connected to the drive shaft 41 of the inlet guide vane 16 via the shaft coupling 46. The shaft coupling 46 has an engagement groove 47 that engages with each of the output shaft 44 and the drive shaft 41 in the rotation direction, and can transmit the driving force of the output shaft 44 to the drive shaft 41. ing.

In the lower bottom portion 42 b of the stuffing box 42, a fitting portion 49 that fits into the insertion hole 48 formed in the housing 20 is formed. An O-ring 50 that seals between the stuffing box 42 and the housing 20 is disposed around the fitting portion 49. An insertion hole 51 is formed in the lower bottom portion 42 b of the stuffing box 42 so as to insert the insertion portion 49. The drive shaft 41 is disposed in the insertion hole 51 with the spacer 52 interposed therebetween. The shaft seal device 40 is provided in the stuffing box 42 and seals around the drive shaft 41 disposed in the insertion hole 51.

The shaft seal device 40 includes a packing housing groove 60, a V packing 70, a pressing member 80, and a bolt 90. The packing housing groove 60 is formed in a cylindrical shape around the drive shaft 41.
The packing housing groove 60 is formed in the stuffing box 42 and has a diameter larger than the diameter of the drive shaft 41. The V packing 70 includes a male adapter 71, a female adapter 72, and a plurality of V-shaped pieces 73 that are formed between the male adapter 71 and the female adapter 72.

The packing accommodating groove 60 accommodates the first V packing 70A and the second V packing 70B. The first V packing 70 </ b> A is arranged with the male adapter 71 side facing the groove bottom 61 of the packing housing groove 60. The second V packing 70B is arranged with the female adapter 72 side facing the female adapter 72 side of the first V packing 70B. That is, the first V packing 70 </ b> A is arranged in a direction that prevents gas leakage from the inside of the housing 20 to the outside. The second V-packing 70B is arranged in a direction that prevents inflow of gas from the outside to the inside of the housing 20 in a vacuum hermetic test or the like.

The pressing member 80 presses the V packing 70 housed in the packing housing groove 60 in the axial direction. The pressing member 80 is formed in a rectangular plate shape in plan view, an insertion hole 81 through which the drive shaft 41 is inserted, an insertion hole 82 through which the bolt 90 is inserted, a pressing portion 83 that presses the V packing 70, Have The insertion hole 81 is formed in the center of the pressing member 80, and the insertion holes 82 are formed in pairs at equal intervals from the center of the insertion hole 81. The pressing portion 83 protrudes in an annular shape on the back surface side of the pressing member 80 and is configured to be able to enter the packing housing groove 60.

The bolt 90 tightens the pressing member 80 and moves the pressing member 80 in the axial direction. The bolt 90 is disposed through the insertion hole 82 of the pressing member 80, is screwed into the screw hole 53 formed in the stuffing box 42, and tightens the pressing member 80. In the present embodiment, the bolt 90 is tightened at two positions sandwiching the drive shaft 41 to move the pressing member 80 in the axial direction. In addition, the bolts 90 of the present embodiment are arranged in pairs in the direction passing between the leg portions 42c of the stuffing box 42, so that the screwdriver tool can be easily accessed.

Next, a method for adjusting the shaft seal device 40 having the above-described configuration (hereinafter sometimes referred to as the present method) will be described.
FIG. 4 is a flowchart showing a method for adjusting the shaft seal device 40 according to the embodiment of the present invention.
As shown in FIG. 4, in this method, the pre-tightening step s1, the correlation measurement step s2, and the tightening torque management step s3 are sequentially performed. The pre-tightening step s1 and the correlation measurement step s2 are performed, for example, by the manufacturer of the turbo compressor 5, and the tightening torque management step s3 is performed, for example, at the delivery destination of the turbo compressor 5 (the assembly site of the turbo refrigerator 1). .

The pre-tightening step s1 is a step in which the bolt 90 is tightened and unfastened as a set before the correlation measuring step s2. In this method, the bolt 90 is tightened and unfastened multiple times. Specifically, when the screw 90 is screwed / unscrewed into the screw hole 53 as one set and several sets (for example, 2 to 5 sets) are performed, the pre-tightening step s1 is finished.

The next correlation measurement step s2 is a step of measuring the correlation between the tightening torque of the bolt 90 and the sliding torque of the drive shaft 41 with respect to the V packing 70. In this step, the IGV control motor unit 16a is removed, and a spring gauge or the like can be installed on the drive shaft 41. Further, the tightening torque of the bolt 90 is measured by spring measurement or the like, and the sliding torque of the drive shaft 41 at that time with respect to the V packing 70 is measured by spring measurement or the like. Each time the bolt 90 is tightened, the sliding torque of the drive shaft 41 is measured, and the measurement is performed until the sliding torque of the drive shaft 41 reaches an appropriate value (Tr shown in FIG. 5).

FIG. 5 is a diagram showing a correlation between the tightening torque of the bolt 90 and the sliding torque of the drive shaft 41 in the embodiment of the present invention.
As shown in FIG. 5, when the V packing 70 is used as the packing material, there is a correlation between the torque of the bolt 90 that tightens the V packing 70 and the sliding torque of the drive shaft 41 with respect to the V packing 70. I understand that. Unlike the gland packing or the like, the V packing 70 has a strong elastic force (restoring force), and even if it is tightened and deformed, it can easily return to its original shape if the tightening is released. Therefore, it is considered that the V packing 70 does not remain crushed like the gland packing, and as a result, such a correlation occurs.

Moreover, the mechanism of shaft sealing by the V packing 70 is as follows. That is, an axial thrust is generated in the pressing member 80 by tightening the bolt 90. When the pressing member 80 is movable in the axial direction, the V packing 70 accommodated in the packing accommodating groove 60 is contracted in the axial direction. When the V packing 70 contracts in the axial direction, the V packing 70 expands in the radial direction. When the V packing 70 swells in the radial direction, the inner diameter of the V packing 70 and the peripheral surface of the drive shaft 41 come into contact with each other, and the sliding friction resistance of the drive shaft 41 increases. When the sliding frictional resistance (sliding torque) of the drive shaft 41 exceeds a certain value, an appropriate shaft seal state in which no gas leaks is obtained.

Thus, it can be seen from the shaft sealing mechanism by the V packing 70 that the tightening torque of the bolt 90 is related to the sliding torque of the drive shaft 41 with respect to the V packing 70.
In order to improve the reproducibility of the correlation between the tightening torque of the bolt 90 and the sliding torque of the drive shaft 41, not only the V packing 70 is selected as the packing material but also the bolt 90 for tightening the V packing 70. It is also important. In this method, in the pre-tightening step s1, the bolt 90 is tightened and unfastened multiple times to physically fit the bolt 90 and the screw hole 53. As a result, fine burrs and the like are removed from the bolt 90 and the screw hole 53 so that the V packing 70 can be tightened smoothly, and the correlation between the tightening torque of the bolt 90 and the sliding torque of the drive shaft 41 is reproduced. Increases sex.

The next tightening torque management step s3 is a step of managing the tightening torque of the bolt 90 based on the correlation measured in the correlation measuring step s2. The tightening torque management step s3 is performed at the delivery destination of the turbo compressor 5. Even if the shaft seal device 40 is adjusted at the time of manufacturing the turbo compressor 5, it is affected by vibrations or the like at the time of transportation, so it is necessary to readjust the shaft seal device 40 at the delivery destination of the turbo compressor 5. is there. This step is performed in a state where the drive shaft 41 and the IGV control motor unit 16a are connected as shown in FIG. That is, the bolt 90 exposed from the side of the stuffing box 42 is accessed, and tightening is performed until the tightening torque of the bolt 90 reaches an appropriate value (Tc shown in FIG. 5) by spring measurement or the like.

As shown in FIG. 5, there is a correlation between the tightening torque of the bolt 90 and the sliding torque of the drive shaft 41. Therefore, if the tightening torque of the bolt 90 is adjusted to an appropriate value (Tc), The sliding torque can also be adjusted to an appropriate value (Tr). That is, in this method, the correlation between the tightening torque of the bolt 90 and the sliding torque of the drive shaft 41 is measured, and the tightening torque of the bolt 90 is managed as a proxy to manage the sliding torque of the drive shaft 41. be able to. For this reason, in this method, it is only necessary to manage the tightening torque of the bolt 90. For example, the heavy IGV control motor unit 16a is removed one by one, and a spring gauge or the like is installed on the drive shaft 41 to slide the drive shaft 41. There is no need to manage torque directly. As a result, the complexity of the adjustment work of the shaft seal device 40 at the delivery destination of the turbo compressor 5 can be eliminated, and the work time can be greatly shortened.

Therefore, in the above-described embodiment, the V packing 70 is accommodated in the packing accommodating groove 60 formed around the drive shaft 41, and the V packing 70 is deformed by the pressing member 80 movable in the axial direction by tightening the bolt 90. A method for adjusting the shaft seal device 40 that seals the periphery of the drive shaft 41, which is a correlation measurement step of measuring the correlation between the tightening torque of the bolt 90 and the sliding torque of the drive shaft 41 with respect to the V packing 70. and a tightening torque management step s3 for managing the tightening torque of the bolt 90 based on the correlation. By adopting such a method, the sliding torque of the drive shaft 41 can be managed by managing the tightening torque of the bolt 90 as a proxy, and the trouble of adjusting the shaft sealing device 40 can be eliminated. be able to.

The preferred embodiment of the present invention has been described above with reference to the drawings, but the present invention is not limited to the above 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, a configuration as shown in FIG. 6 may be adopted. In FIG. 6, the same or equivalent components as those in the above embodiment are given the same reference numerals.
FIG. 6 is a perspective view showing the appearance of the shaft seal device 40 in another embodiment of the present invention.

As shown in FIG. 6, the shaft seal device 40 of another embodiment is provided in a stuffing box 42 that attaches the DDC control motor unit 17 a to the housing 20. The configurations of the shaft seal device 40 and the stuffing box 42 are substantially the same as those in the above embodiment. As shown in FIG. 1, since the outlet throttle valve 17 is also driven by the drive shaft 54 that penetrates the housing 20, it is necessary to seal the periphery of the drive shaft 54 with the shaft seal device 40. Even in this alternative embodiment, if the above method is adopted, the shaft seal device 40 can be adjusted properly without removing the DDC control motor unit 17a, so that the complexity of the adjustment work can be eliminated.

Further, for example, in the above-described embodiment, the mode in which the present technique is applied to the adjustment method of the shaft seal device that seals the drive shaft of the inlet guide vane of the turbo compressor and the drive shaft of the outlet throttle valve is exemplified. The present invention is not limited to this form. For example, the present technique can also be applied to a method for adjusting a shaft seal device of a valve shaft of a valve device that also handles fluid.

DESCRIPTION OF SYMBOLS 1 Turbo refrigerator 5 Turbo compressor 16 Inlet guide vane 16a IGV control motor unit (motor unit)
17 Outlet throttle valve 17a DDC control motor unit (motor unit)
40 shaft seal device 60 packing receiving groove 61 groove bottom 70 V packing 70A first V packing 70B second V packing 71 male adapter 72 female adapter 73 V-shaped piece 80 pressing member 90 bolt s1 pre-tightening step s2 correlation measuring step s3 Tightening torque management process

Claims

Adjustment of the shaft seal device that houses the V packing in the packing housing groove formed around the drive shaft, deforms the V packing by a pressing member that moves in the axial direction by tightening a bolt, and seals around the drive shaft A method,
A correlation measuring step of measuring a correlation between a tightening torque of the bolt and a sliding torque of the drive shaft with respect to the V packing;
And a tightening torque management step for managing a tightening torque of the bolt based on the correlation.
The method for adjusting a shaft seal device according to claim 1, further comprising a pre-tightening step of tightening and releasing the bolts as a set before the correlation measurement step.
The adjusting method of the shaft seal device according to claim 2, wherein in the pre-tightening step, the bolt is tightened and the tightening is released a plurality of times.
A motor unit is connected to the drive shaft,
The shaft sealing device adjusting method according to any one of claims 1 to 3, wherein the tightening torque management step is performed in a state where the drive shaft and the motor unit are connected.
The V packing has a male adapter, a female adapter, and a plurality of V-shaped pieces formed between the male adapter and the female adapter,
The packing receiving groove has a first V packing with the male adapter side facing the groove bottom, and a second V packing with the female adapter side facing the female adapter side of the first V packing. The method for adjusting the shaft seal device according to claim 1, wherein:
The V packing has a male adapter, a female adapter, and a plurality of V-shaped pieces formed between the male adapter and the female adapter,
The packing receiving groove has a first V packing with the male adapter side facing the groove bottom, and a second V packing with the female adapter side facing the female adapter side of the first V packing. The method for adjusting the shaft seal device according to claim 2, wherein:
The V packing has a male adapter, a female adapter, and a plurality of V-shaped pieces formed between the male adapter and the female adapter,
The packing receiving groove has a first V packing with the male adapter side facing the groove bottom, and a second V packing with the female adapter side facing the female adapter side of the first V packing. The method for adjusting a shaft seal device according to claim 3, wherein:
The V packing has a male adapter, a female adapter, and a plurality of V-shaped pieces formed between the male adapter and the female adapter,
The packing receiving groove has a first V packing with the male adapter side facing the groove bottom, and a second V packing with the female adapter side facing the female adapter side of the first V packing. The method for adjusting the shaft seal device according to claim 4, wherein: