Lubrication oil tanks and rotating machinery systems

Abstract

To simplify an internal structure while having a plurality of introduction parts.SOLUTION: A lubricant tank comprises a tank casing extending in a first direction, a plurality of introduction parts which are arranged so as to separate from one another in the first direction, a receiving part arranged below the plurality of introduction parts in a vertical direction in the tank casing, receiving the lubricant introduced from the plurality of introduction parts, and making the lubricant circulate toward a second end part of the tank casing in the first direction, and one strainer which can collect foreign matters in the lubricant which has circulated in the receiving part. The receiving part is inclined so as to progress downward in the vertical direction as approaching the second end part in the first direction. The strainer is arranged in a position near the second end part with respect to the plurality of introduction parts in the first direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a lubricating oil tank and a rotating machine system.

Background Art

[0002] The rotors of rotating machines such as compressors, turbines, and motors are rotatably supported via bearings. The bearings are supplied with lubricating oil pumped from a lubricating oil tank or the like. The lubricating oil that has lubricated the bearings is discharged from the bearings and recovered in the lubricating oil tank, and then supplied to the bearings again by a pump or the like. Various forms are applied to such lubricating oil tanks.

[0003] For example, Patent Document 1 describes a structure in which a plurality of partition plates are arranged in the middle of an inclined guide plate in an oil tank of an oil supply device. In the structure described in Patent Document 1, the lubricating oil flowing through the guide plate passes through the plurality of partition plates, and the bubbles in the oil are removed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in a lubricating oil tank, lubricating oil may be supplied from a plurality of bearings. In that case, a plurality of pipes are connected to one lubricating oil tank as introduction parts of the lubricating oil. By arranging the plurality of pipes to the inside of the lubricating oil tank, the internal structure of the lubricating oil tank becomes complicated and the weight of the entire lubricating oil tank increases.

[0006] This disclosure was made to solve the above-mentioned problems and aims to provide a lubricating oil tank and a rotating machinery system that have multiple inlets while simplifying the internal structure. [Means for solving the problem]

[0007] To solve the above problems, the lubricating oil tank according to the present disclosure comprises: a tank casing extending in a first direction and capable of storing lubricating oil inside; a plurality of introduction ports that allow the lubricating oil to be introduced into the tank casing and are spaced apart from each other in the first direction; an outlet port located at the first end of the tank casing in the first direction and capable of discharging the lubricating oil stored inside the tank casing; a receiving port located vertically below the plurality of introduction ports within the tank casing and receiving the lubricating oil introduced from the plurality of introduction ports and circulating it toward the second end of the tank casing in the first direction; and a strainer capable of collecting foreign matter in the lubricating oil that has circulated through the receiving port, wherein the receiving port is inclined vertically downward as it approaches the second end in the first direction, and the strainer is located in the first direction at a position close to the second end relative to the plurality of introduction ports.

[0008] Furthermore, the rotating machinery system according to this disclosure comprises a rotating machine and a lubricating oil tank for storing the lubricating oil supplied to the rotating machine. [Effects of the Invention]

[0009] The lubricating oil tank and rotating machinery system of this disclosure can be simplified in its internal structure while having multiple inlets. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing the general configuration of a compressor system according to an embodiment of the present invention. [Figure 2] This is a schematic cross-sectional view showing the configuration of a lubricating oil tank according to an embodiment of the present invention. [Figure 3] This is a schematic cross-sectional view taken along line III-III in Figure 2, showing the configuration of a lubricating oil tank according to an embodiment of the present invention. [Figure 4] This is a schematic cross-sectional view taken along the line IV-IV in Figure 3, showing the configuration of a lubricating oil tank according to an embodiment of the present invention. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments for implementing the lubricating oil tank and rotating machinery system according to this disclosure will be described with reference to the attached drawings. However, this disclosure is not limited to these embodiments.

[0012] (Compressor system configuration) Figure 1 is a schematic diagram illustrating the general configuration of a compressor system (rotating machine system) 100 according to an embodiment of the present invention. As shown in Figure 1, the compressor system (rotating machine system) 100 of this embodiment comprises a rotary drive unit 110, a compressor 120, and a lubricating oil supply device 2. The rotary drive unit 110 and the compressor 120 are the rotating machines in the rotating machine system of this embodiment.

[0013] (Rotating drive machine) The rotary drive unit 110 is connected to the compressor 120. The rotary drive unit 110 drives the compressor 120. The rotary drive unit 110 has an output shaft 111 that is driven to rotate. In this embodiment, the rotary drive unit 110 is an electric motor. The rotary drive unit 110 always drives the output shaft 111 to rotate around axis O at a constant speed. The output shaft 111 is cylindrical with axis O as its center. The rotary drive unit 110 has a pair of drive bearings (bearings) 112 that support the output shaft 111 so that it can rotate freely around axis O.

[0014] In this embodiment, the direction perpendicular to the vertical direction Dv and in which the axis O extends is referred to as the axial direction Da. The axial direction Da is one of the horizontal directions. Furthermore, the direction perpendicular to both the axial direction Da and the vertical direction Dv is referred to as the width direction Dw. In other words, the width direction Dw is one of the horizontal directions and is a different direction from the axial direction Da.

[0015] (Compressor) The compressor 120 is positioned alongside the rotary drive unit 110 at an axial distance Da. The compressor 120 receives the rotation of the output shaft 111. The compressor 120 in this embodiment is, for example, a multi-stage centrifugal compressor. The compressor 120 has a rotor 121 connected to the output shaft 111. The rotor 121 rotates around axis O. The rotor 121 is cylindrical with axis O as its center. The compressor 120 has a pair of compressor bearings (bearings) 122 that support the rotor 121 so that it can rotate freely around axis O.

[0016] (Lubricating oil supply device) The lubrication oil supply device 2 recovers and re-supplies the lubricating oil used in the pair of drive bearings 112 and the pair of compressor bearings 122, thereby circulating it. The lubrication oil supply device 2 in this embodiment includes a lubrication oil tank 20, a heater 21, a pump 22, an oil cooler 23, and an oil filter 24. In this embodiment, the components that constitute part of the lubrication oil supply device 2, such as the heater 21, pump 22, oil cooler 23, and oil filter 24, are all fixed onto the tank casing 3, which will be described later.

[0017] The lubricating oil tank 20 stores lubricating oil supplied to a pair of drive machine bearings 112 and a pair of compressor bearings 122. The heater 21 heats the lubricating oil stored in the lubricating oil tank 20. The pump 22 pumps the lubricating oil stored in the lubricating oil tank 20 toward the drive machine bearings 112 and the compressor bearings 122. The oil cooler 23 cools the lubricating oil before it is pumped from the pump 22 and supplied to the drive machine bearings 112 and the compressor bearings 122. The oil filter 24 removes foreign matters such as dust mixed in the lubricating oil cooled by the oil cooler 23. The lubricating oil passing through the oil filter 24 is supplied to the drive machine bearings 112 and the compressor bearings 122.

[0018] FIG. 2 is a schematic cross-sectional view for explaining the configuration of the lubricating oil tank 20 according to an embodiment of the present invention. As shown in FIG. 2, the lubricating oil tank 20 includes a tank casing 3, an introduction part 4, a derivation part 5, a receiving part 6, a strainer 68, and a baffle plate 69.

[0019] (Tank casing) The tank casing 3 is capable of storing lubricating oil inside. The tank casing 3 is formed in a cylindrical shape extending in the first direction. As shown in FIG. 2, the tank casing 3 of the present embodiment has a tank casing main body 31 and a lid part 39. The first direction is one of the horizontal directions and is the longitudinal direction of the tank casing main body 31. The first direction of the present embodiment is the axial direction Da.

[0020] The tank casing main body 31 has a hollow interior and is formed in a bottomed rectangular tube shape extending in the axial direction Da. The tank casing main body 31 extends from the first end portion 31a to the second end portion 31b in the axial direction Da. The tank casing main body 31 is formed in a size such that, while the lubricating oil stored inside flows through the inside from the second end portion 31b to the first end portion 31a in the axial direction Da, a circulation time sufficient for the bubbles in the lubricating oil to be sufficiently degassed can be ensured. A plurality of openings 32 penetrating the inside and the outside are formed in the tank casing main body 31. The openings 32 are formed in a size through which an operator can pass. In the present embodiment, as the openings 32, there are an upper opening 321 and a plurality of lower openings 322.

[0021] The upper opening 321 is formed in the tank casing main body 31 above the receiving portion 6 in the vertical direction Dv. The upper opening 321 of the present embodiment is formed so as to penetrate the upper wall portion 311 constituting the top surface of the tank casing main body 31. Only one upper opening 321 is formed near the center of the tank casing main body 31 in the axial direction Da.

[0022] The lower opening 322 is formed in the tank casing main body 31 below the receiving portion 6 in the vertical direction Dv. The lower opening 322 of the present embodiment is formed so as to penetrate the side wall 313 constituting the side surface of the tank casing main body 31. A plurality (four in the present embodiment) of lower openings 322 are formed apart from each other in the axial direction Da.

[0023] The lid portion 39 closes the opening 32. The lid portion 39 is detachable from the tank casing main body 31. One lid portion 39 is arranged for one opening 32. Therefore, each lid portion 39 of the present embodiment closes each of the upper opening 321 and the plurality of lower openings 322.

[0024] The introduction section 4 is capable of introducing lubricating oil into the tank casing 3. The multiple introduction sections 4 are arranged apart from each other in the axial direction Da. Each of the multiple introduction sections 4 is connected to a bearing. In this embodiment, the multiple introduction sections 4 include a first introduction section 41 connected to one drive bearing 112, a second introduction section 42 connected to the other drive bearing 112, a third introduction section 43 connected to one compressor bearing 122, and a fourth introduction section 44 connected to the other compressor bearing 122. Each introduction section 4 is positioned in the axial direction Da to overlap with the lower opening 322. Each introduction section 4 in this embodiment has a main pipe 48 and an inlet pipe 49.

[0025] As shown in Figure 3, the main pipe 48 is positioned to penetrate the side wall 313 of the tank casing body 31. The main pipe 48 is connected to the bearing, which is the source of lubricating oil. The main pipe 48 extends in the width direction Dw. The inlet pipe 49 is connected to the main pipe 48 inside the tank casing 3. As shown in Figures 2 and 3, the inlet pipe 49 opens downward in the vertical direction Dv and in the axial direction Da towards the second end 31b of the tank casing body 31. In other words, when viewed from the width direction Dw, the inlet pipe 49 extends at an angle rather than straight in the vertical direction Dv. The inlet pipe 49 is installed at a slope of, for example, 1 / 25 degrees.

[0026] As shown in Figure 2, the outlet section 5 is capable of discharging lubricating oil stored inside the tank casing 3 to the outside of the tank casing 3. The outlet section 5 is positioned close to the first end 31a of the tank casing body 31 in the axial direction Da. In this embodiment, the outlet section 5 is the suction port of the pump 22. The outlet section 5 draws out lubricating oil from a position close to the lower wall portion 312 that forms the bottom of the tank casing body 31. In this embodiment, only one outlet section 5 is provided. However, the structure is not limited to having only one outlet section 5, and multiple outlet sections may be provided. However, when providing multiple outlet sections 5, it is preferable that all outlet sections 5 are positioned close to the first end 31a of the tank casing body 31 so that their axial directions Da overlap.

[0027] The receiving section 6 receives lubricating oil introduced from the multiple inlet sections 4 and circulates it toward the second end 31b of the tank casing body 31 in the axial direction Da. The receiving section 6 is positioned below the multiple inlet sections 4 in the vertical direction Dv within the tank casing 3. The receiving section 6 is inclined downward in the vertical direction Dv as it approaches the second end 31b from the first end 31a in the axial direction Da. The receiving section 6 forms a circulation space S2 inside the tank casing 3, partitioned from the storage space S1 in which the lubricating oil is stored. In this embodiment, the receiving section 6 forms the circulation space S2 as a flow path with a rectangular cross-section, as shown in Figure 3. The circulation space S2 is the space through which the lubricating oil introduced from the inlet sections 4 circulates before being supplied to the storage space S1. As shown in Figure 2, the flow space S2 has a first flow space S21 extending in the axial direction Da from the first end 31a to the second end 31b, and a second flow space S22 that connects to the first flow space S21 near the second end 31b and extends straight in the vertical direction Dv. In other words, the receiving section 6 forms an L-shaped flow path inside the tank casing body 31. Also, as shown in Figures 2 and 3, the receiving section 6 of this embodiment has a receiving surface 61, a partition wall 62, and a communication hole 63.

[0028] The receiving surface 61 is a plate-shaped member through which lubricating oil flows. The receiving surface 61 is positioned below the vertical direction Dv relative to the multiple inlet sections 4. The receiving surface 61 extends in the axial direction Da and receives the lubricating oil supplied from the inlet sections 4. The receiving surface 61 is positioned above the vertical direction Dv relative to the oil level of the lubricating oil stored in the tank casing 3. The receiving surface 61 has a smooth surface that does not obstruct the flow of lubricating oil and has a portion that contacts the lubricating oil. In the first flow space S21, the receiving surface 61 extends diagonally and straight when viewed from the width direction Dw. The receiving surface 61 is installed with a gradient of at least 1 / 100 degrees, which is smaller than the inclination of the inlet pipe 49. The receiving surface 61 is connected to the side wall 313 of the tank casing body 31.

[0029] The bulkhead 62 extends upward in the vertical direction Dv from the receiving surface 61. The bulkhead 62 extends parallel to the side wall 313 of the tank casing body 31. The bulkhead 62 is connected to the upper wall portion 311.

[0030] The communication holes 63 connect the storage space S1 and the distribution space S2. The communication holes 63 penetrate the partition wall 62 in the width direction Dw. The communication holes 63 are formed in the upper part of the partition wall 62 in the vertical direction Dv. In other words, the communication holes 63 are positioned above the receiving surface 61 in the vertical direction Dv. As shown in Figure 4, multiple communication holes 63 are arranged at intervals in the axial direction Da.

[0031] As shown in Figure 2, the strainer 68 is capable of collecting foreign matter in the lubricating oil that has flowed through the receiving section 6. Only one strainer 68 is installed. The strainer 68 is positioned in the axial direction Da, close to the second end 31b relative to the multiple inlet sections 4. Specifically, the strainer 68 is detachably attached to the receiving section 6 in the second flow space S22. The strainer 68 is positioned to be in contact with the lubricating oil flowing downward in the vertical direction Dv in the second flow space S22. The strainer 68 is capable of capturing foreign matter contained in the lubricating oil flowing through the second flow space S22 and preventing it from flowing into the storage space S1. Therefore, by passing through the strainer 68, only lubricating oil flows into the storage space S1. The strainer 68 is, for example, a metal mesh material.

[0032] The baffle plate 69 mitigates the impact of the lubricating oil at the outlet of the receiving section 6 so that the lubricating oil flowing through the receiving section 6 does not directly collide with the bottom surface of the tank casing body 31. The baffle plate 69 is positioned at a distance of Dv in the vertical direction from the outlet of the receiving section 6. The baffle plate 69 is a plate-shaped member positioned so that its main surface faces the vertical direction Dv. The lubricating oil flowing downward in the vertical direction Dv through the second flow space S22 collides with the baffle plate 69, causing its flow direction to change horizontally. In this way, the baffle plate 69 causes the lubricating oil to flow horizontally towards the bottom of the tank casing body 31.

[0033] (Effects and Benefits) In the lubricating oil tank 20 and compressor system 100 configured as described above, the lubricating oil used by the pair of drive bearings 112 is sent to the first inlet 41 and the second inlet 42, respectively. The lubricating oil used by the pair of compressor bearings 122 is sent to the third inlet 43 and the fourth inlet 44, respectively. The lubricating oil introduced into the tank casing 3 from the first inlet 41, the second inlet 42, the third inlet 43, and the fourth inlet 44 falls into the receiving section 6. The lubricating oil that falls into the receiving section 6 flows through the first flow space S21 toward the second end 31b in the axial direction Da, along the receiving surface 61 which is inclined diagonally and straight downwards in the vertical direction Dv as it approaches the second end 31b in the axial direction Da. After that, the lubricating oil that has flowed through the first flow space S21 reaches the second flow space S22 and falls toward the bottom of the tank casing body 31. Then, as the lubricating oil falls through the second circulation space S22, it comes into contact with the strainer 68. As a result, foreign matter contained in the lubricating oil is captured by the strainer 68, and only the lubricating oil flows into the storage space S1. The lubricating oil that flows into the storage space S1 slowly moves from the second end 31b in the axial direction Da to the first end 31a inside the tank casing body 31, where it is degassed. The lubricating oil stored inside the tank casing body 31 is heated by the heater 21. After that, the lubricating oil that reaches the outlet 5 is sucked up by the pump 22 and sent again to the pair of drive bearings 112 and the pair of compressor bearings 122. In this process, the lubricating oil sent from the pump 22 is cooled by the oil cooler 23. Furthermore, the cooled lubricating oil has foreign matter such as dirt removed by the oil filter 24 and is sent to the pair of drive bearings 112 and the pair of compressor bearings 122.

[0034] In this manner, the lubricating oil introduced from the multiple inlet sections 4 is sent to the storage space S1 by the receiving section 6. Therefore, it is not necessary to extend multiple pipes to the location where the lubricating oil is stored inside the tank casing body 31. As a result, the internal structure of the tank casing body 31 can be simplified. Furthermore, foreign matter in the lubricating oil that has flowed through the receiving section 6 is collected by only one strainer 68. In other words, a strainer 68 is not attached to each of the multiple inlet sections 4. Therefore, it is not necessary to attach multiple long pipes or multiple strainers 68 to the tank casing body 31, and the weight of the lubricating oil tank 20 can be reduced. In this way, the internal structure can be simplified while having multiple inlet sections 4.

[0035] Furthermore, the receiving section 6 forms a flow space S2 partitioned from the storage space S1 in which the lubricating oil is stored. In the flow space S2, the receiving section 6 guides the lubricating oil with a receiving surface 61 positioned vertically downward Dv relative to the multiple inlet sections 4. On the receiving surface 61, the lubricating oil flows from the first flow space S21 to the second flow space S22. In addition, multiple communication holes 63 are formed in the partition wall 62 that extends vertically upward Dv from the receiving surface 61. Therefore, bubbles (gas) released from the lubricating oil during the flow of the receiving surface 61 do not accumulate in the first flow space S21, but are discharged into the storage space S1 through the communication holes 63. As a result, it is possible to suppress adverse effects such as bubbles accumulating near the inlet sections 4 and backflowing into the drive bearing 112 and compressor bearing 122.

[0036] Furthermore, the receiving surface 61 is positioned vertically Dv above the oil level of the lubricating oil stored in the storage space S1. Therefore, the lubricating oil stored in the storage space S1 does not come into contact with the receiving surface 61. Consequently, regardless of the amount of lubricating oil stored in the storage space S1, the stored lubricating oil does not affect the lubricating oil flowing over the receiving surface 61. This allows the receiving surface 61 to stably circulate the lubricating oil introduced from the multiple inlet sections 4.

[0037] Furthermore, each of the multiple inlet sections 4 is connected to the main pipe 48 and has an inlet pipe 49 that opens downward in the vertical direction Dv and toward the second end 31b in the axial direction Da. Lubricating oil is supplied from the inlet pipe 49 toward the receiving surface 61. As a result, the lubricating oil is supplied to the receiving surface 61 with momentum toward the second end 31b in the axial direction Da. This gives momentum to the lubricating oil flowing across the receiving surface 61, allowing it to flow stably toward the second end 31b.

[0038] Furthermore, the upper opening 321 and lower opening 322 are covered by a detachable lid 39 attached to the tank casing body 31. In other words, by removing the lid 39 from the tank casing body 31, the upper opening 321 and lower opening 322 are opened. As a result, the inside of the tank casing body 31 can be accessed through the upper opening 321 and lower opening 322. This allows workers to clean the inside of the tank casing body 31 through the upper opening 321 and lower opening 322.

[0039] In particular, the lower opening 322 is formed below the lubricating oil level in the vertical direction Dv, allowing workers to easily access areas close to the bottom of the tank casing body 31. The bottom of the tank casing body 31 often accumulates sediment called sludge due to the storage of lubricating oil. The lower opening 322 allows such sludge to be easily removed from the tank casing body 31.

[0040] Furthermore, the lower openings 322 are arranged in multiple locations spaced apart in the axial direction Da. Therefore, the bottom of the tank casing body 31 can be accessed from multiple locations in the axial direction Da. Consequently, sludge can be easily removed from a wide area inside the tank casing body 31.

[0041] (Other embodiments) Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design changes and the like that do not depart from the gist of this disclosure.

[0042] For example, in the above embodiment, a compressor system 100 equipped with a rotary drive unit 110 and a compressor 120 as rotating machinery was illustrated, but the rotating machinery system is not limited to this. For example, the rotating machinery system may be equipped with a turbine as rotating machinery. Furthermore, the rotating machinery system is not limited to a structure having both a rotary drive unit 110 and a compressor 120. The rotating machinery system may be a structure having only one of the rotary drive unit 110 and the compressor 120.

[0043] Furthermore, the compressor system 100 is not limited to a structure in which the rotary drive unit 110 and the compressor 120 are directly connected. The rotary drive unit 110 and the compressor 120 may be indirectly connected via a transmission.

[0044] Furthermore, the equipment constituting part of the lubrication oil supply device 2, such as the heater 21, pump 22, oil cooler 23, and oil filter 24, is not limited to being all located on the tank casing 3. For example, some of the equipment, such as the oil cooler 23, may be located elsewhere than on the tank casing 3.

[0045] Furthermore, in the lubricating oil tank 20, the strainer 68 may always be present, or it may be temporarily placed so as to be installed only during the initial operation of the compressor system 100 and then removed thereafter.

[0046] <Note> The lubricating oil tank 20 and rotating machinery system described in the embodiment can be understood, for example, as follows:

[0047] (1) The lubricating oil tank 20 according to the first embodiment comprises a tank casing 3 extending in a first direction and capable of storing lubricating oil inside, a plurality of introduction parts 4 that allow the lubricating oil to be introduced into the tank casing 3 and are spaced apart from each other in the first direction, an outlet part 5 located at the first end 31a of the tank casing 3 in the first direction and capable of discharging the lubricating oil stored inside the tank casing 3, a receiving part 6 located in the tank casing 3 below the plurality of introduction parts 4 in the vertical direction Dv and receiving the lubricating oil introduced from the plurality of introduction parts 4 and circulating it toward the second end 31b of the tank casing 3 in the first direction, and a strainer 68 capable of collecting foreign matter in the lubricating oil that has circulated through the receiving part 6, wherein the receiving part 6 is inclined downward in the vertical direction Dv as it approaches the second end 31b in the first direction, and the strainer 68 is located in the first direction at a position close to the second end 31b relative to the plurality of introduction parts 4.

[0048] As a result, the lubricating oil introduced from multiple inlet sections 4 is sent to the storage space by the receiving section 6. Therefore, there is no need to extend multiple pipes to the location where the lubricating oil is stored inside the tank casing 3. Consequently, the internal structure of the tank casing 3 can be simplified. In addition, foreign matter in the lubricating oil that has flowed through the receiving section 6 is collected by only one strainer 68. In other words, a strainer 68 is not attached to each of the multiple inlet sections 4. Therefore, there is no need to attach multiple long pipes or multiple strainers 68 to the tank casing 3, and the weight of the lubricating oil tank 20 can be reduced. In this way, the internal structure can be simplified while having multiple inlet sections 4.

[0049] (2) The lubricating oil tank 20 according to the second embodiment is the lubricating oil tank 20 of (1), wherein the receiving portion 6 forms a flow space S2 partitioned from the storage space S1 in which the lubricating oil is stored in the tank casing 3, and the receiving portion 6 has a receiving surface 61 that extends in the first direction below the vertical direction Dv to receive the lubricating oil from a plurality of introduction portions 4, a partition wall 62 that extends from the receiving surface 61 above the vertical direction Dv, and a communication hole 63 that penetrates the partition wall 62 and connects the storage space S1 and the flow space S2.

[0050] As a result, in the flow space S2, the receiving section 6 guides the lubricating oil through a receiving surface 61 positioned vertically downward Dv relative to the multiple inlet sections 4. Furthermore, multiple communication holes 63 are formed in the partition wall 62 extending vertically upward Dv from the receiving surface 61. Therefore, bubbles (gas) released from the lubricating oil during the flow across the receiving surface 61 do not accumulate in the flow space S2, but are discharged into the storage space S1 through the communication holes 63. This prevents bubbles from accumulating near the inlet sections 4, which could cause adverse effects such as backflow into the bearings.

[0051] (3) The lubricating oil tank 20 according to the third embodiment is the lubricating oil tank 20 of (2), wherein the receiving surface 61 is positioned above the vertical Dv with respect to the oil level of the lubricating oil stored in the tank casing 3.

[0052] As a result, the lubricating oil stored in the storage space S1 does not come into contact with the receiving surface 61. Therefore, regardless of the amount of lubricating oil stored in the storage space S1, the stored lubricating oil does not affect the lubricating oil flowing over the receiving surface 61. This allows the receiving surface 61 to stably distribute the lubricating oil introduced from the multiple inlet sections 4.

[0053] (4) The lubricating oil tank 20 according to the fourth embodiment is any one of the lubricating oil tanks 20 from (1) to (3), wherein the introduction section 4 has a main pipe 48 arranged to penetrate the tank casing 3 and an inlet pipe 49 connected to the main pipe 48 inside the tank casing 3 and opening so as to face the second end 31b in the vertical direction Dv and in the first direction.

[0054] As a result, lubricating oil is supplied from the inlet pipe 49 toward the receiving surface 61. Therefore, the lubricating oil is supplied to the receiving surface 61 with momentum toward the second end 31b in the first direction. This gives momentum to the lubricating oil flowing across the receiving surface 61, allowing it to flow stably toward the second end 31b.

[0055] (5) The lubricating oil tank 20 according to the fifth embodiment is any one of the lubricating oil tanks 20 from (1) to (4), wherein the tank casing 3 comprises a tank casing body 31 having an opening 32 that connects the inside and the outside, formed below the oil level of the lubricating oil stored inside in the vertical direction Dv, and a lid 39 that is detachable from the tank casing body 31 and closes the opening 32.

[0056] As a result, by removing the lid 39 from the tank casing body 31, the opening 32 is opened. Therefore, the inside of the tank casing body 31 can be accessed through the opening 32. This allows workers to clean the inside of the tank casing body 31 through the opening 32. In particular, because the opening 32 is formed below the vertical direction Dv with respect to the oil level of the lubricating oil, workers can easily access areas close to the bottom of the tank casing body 31. The bottom of the tank casing body 31 often accumulates sediment called sludge due to the accumulation of lubricating oil. With the opening 32 formed, such sludge can be easily removed from the tank casing body 31.

[0057] (6) The lubricating oil tank 20 according to the sixth embodiment is the lubricating oil tank 20 of (5), wherein the openings 32 and the lids 39 are arranged apart in the first direction.

[0058] This allows access to the bottom of the tank casing body 31 from multiple locations in the first direction. Therefore, sludge can be easily removed from a wide area inside the tank casing body 31.

[0059] (7) The rotating machinery system according to the seventh embodiment comprises a rotating machine and one of the lubricating oil tanks 20 of (1) to (6) for storing lubricating oil supplied to the rotating machine. [Explanation of symbols]

[0060] 100... Compressor system 110... Rotary drive machine 111... Output shaft O…Axis line 112…Drive bearing 120... Compressor 121... Rotor 122... Compressor bearing 2…Lubricating oil supply device 20… Lubricating oil tank 3… Tank casing 31... Tank casing body 32…Opening 321...Top opening 322...Lower opening 31a...first end 31b…Second end 311...Top wall part 312…Lower wall part 313…Side wall 39…Lid part 4…Introduction 41…First Introduction 42…Second introduction 43…Third introduction part 44…Fourth introduction part 48…Main piping 49... Inlet piping 5…Derivation part 6... Receiving part 61... Receiving surface 62...Bulkhead 63…Communication hole S1...Storage space S2…Distribution space S21…First distribution space S22…Second circulation space 68... Strainer 69... Baffle plate 21... Heater 22... Pump 23… Oil cooler 24… Oil filter Da... Axis Dv…Vertical direction Dw... width direction

Claims

1. A tank casing extending in the first direction and capable of storing lubricating oil internally, The tank casing allows the lubricating oil to be introduced, and comprises a plurality of introduction sections arranged apart from each other in the first direction, Distributed at the first end of the tank casing in the first direction, the discharge portion is capable of discharging the lubricating oil stored inside the tank casing, A receiving portion is positioned vertically below the plurality of inlet portions within the tank casing, and receives the lubricating oil introduced from the plurality of inlet portions and circulates it toward the second end of the tank casing in the first direction, The receiving portion comprises a strainer capable of collecting foreign matter in the lubricating oil that has flowed through it, The receiving portion is inclined downward in the vertical direction as it approaches the second end in the first direction, The strainer is a lubricating oil tank positioned in the first direction, close to the second end relative to the plurality of inlet sections.

2. The receiving portion forms a flow space partitioned from the storage space in the tank casing where the lubricating oil is stored. The lubricating oil tank according to claim 1, wherein the receiving portion has a receiving surface that extends in the first direction vertically downward from a plurality of introduction portions to receive the lubricating oil, a partition wall that extends vertically upward from the receiving surface, and a communication hole that penetrates the partition wall and connects the storage space and the flow space.

3. The lubricating oil tank according to claim 2, wherein the receiving surface is positioned vertically above the oil surface of the lubricating oil stored in the tank casing.

4. The lubricating oil tank according to claim 1 or 2, wherein the introduction section comprises a main pipe arranged to penetrate the tank casing and an inlet pipe connected to the main pipe inside the tank casing, and having an opening that faces downward in the vertical direction and toward the second end in the first direction.

5. The aforementioned tank casing is A tank casing body having an opening that connects the inside and the outside, located vertically below the oil level of the lubricating oil stored inside, A lubricating oil tank according to claim 1 or 2, having a lid that is detachably attached to the tank casing body and closes the opening.

6. The lubricating oil tank according to claim 5, wherein the openings and lids are arranged apart in the first direction.

7. Rotating machinery and, A rotating machine system comprising a lubricating oil tank according to claim 1 or 2 for storing lubricating oil supplied to the rotating machine.

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