Cold and heat power generation device and cold and heat power generation system

Abstract

A cooling / heating power generation device is provided with a thrust bearing device which is disposed on the inner peripheral side of an inner housing on one side in the axial direction of a rotor shaft relative to a first journal bearing device. A radial gap connected to a heat medium flow path is defined between the disk portion and the other end surface of the inner housing, and at least one pressure equalizing flow path is formed in the inner housing, said pressure equalizing flow path connecting a first space inside the inner housing on the side of the first journal bearing device and the radial gap.

Description

Technical Field

[0001] The present disclosure relates to a cold-heat power generation device and a cold-heat power generation system.

[0002] This application claims priority based on Japanese Patent Application No. 2022-164632 filed with the Japan Patent Office on October 13, 2022, and the contents are incorporated herein by reference. Background Art

[0003] Liquefied gas (e.g., liquefied natural gas) is liquefied for the purpose of transportation or storage, and when supplied to a supply destination such as city gas or thermal power generation, it is heated and vaporized using a heat medium such as seawater. When liquefied gas is vaporized, there is cold and heat power generation that does not discard the cold and heat energy into seawater but recovers it as electricity.

[0004] As a heat and cold power generation cycle using liquefied natural gas, ORC (Organic Rankine Cycle) is known. ORC is a cycle process in which a low-temperature working fluid with a lower boiling point than water circulating in a closed loop is cooled and condensed by liquefied natural gas in a condenser (steam condenser), the pressure is increased by a pump, seawater or the like is used as a heat source in an evaporator to heat and evaporate it, and the vapor is introduced into a turbine for heat and cold power generation to obtain power.

[0005] Patent Document 1 discloses a heat and cold power generation device in which a turbine and a generator are coaxially arranged in the same housing in order to miniaturize the heat and cold power generation device. In the heat and cold power generation device, a generator is arranged in the center of the shaft, and a turbine and a thrust bearing are arranged on one side of the generator.

[0006] Prior art literature

[0007] Patent Document 1: Chinese Utility Model Specification No. 210660229 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the conventional structure shown in Patent Document 1, the thrust bearing is arranged inside the housing at the upstream side of the generator, and the part where the thrust bearing is arranged becomes high pressure. Therefore, the cooling and heating power generation turbine generates wind loss (loss) due to rotation at the thrust bearing, and the generator performance may be reduced.

[0010] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a cold-heat power generation device capable of suppressing a decrease in generator performance by reducing wind loss (loss) at a thrust bearing.

[0011] Means for solving problems

[0012] In order to achieve the above-mentioned purpose, the cold and heat power generation device of the present invention is arranged in a heat medium circulation pipeline, and the heat medium circulation pipeline is configured to circulate the heat medium for heating liquefied gas. The cold and heat power generation device comprises: a rotor shaft; a generator, including an electric motor rotor supported on the outer peripheral surface of the above-mentioned rotor shaft and an electric motor stator arranged opposite to the above-mentioned electric motor rotor; an inner shell, accommodating the above-mentioned generator; an outer shell, arranged on the outer peripheral side of the above-mentioned inner shell, and defining a heat medium flow path between the above-mentioned outer shell and the above-mentioned inner shell; a first-stage turbine device, arranged in the above-mentioned heat medium flow path, and arranged on one side of the above-mentioned rotor shaft in the axial direction than the above-mentioned generator; a second-stage turbine device, arranged in the above-mentioned heat medium flow path, and arranged on the other side of the above-mentioned rotor shaft in the axial direction than the above-mentioned generator; a journal bearing device, The inner circumference of the inner shell is arranged at the other side of the generator; and a thrust bearing device is arranged on the inner circumference of the inner shell at the one side of the journal bearing device, the second-stage turbine device includes second-stage stationary blades and second-stage moving blades arranged at the other side of the second-stage stationary blades, the rotor shaft includes a disk portion extending radially and supporting the second-stage moving blades of the second-stage turbine device, a radial gap connected to the heat medium flow path on the other side of the second-stage stationary blades is divided between the end face of the other side of the inner shell, i.e., the other side end face and the disk portion, and at least one equalizing flow path is formed in the inner shell to connect the first space inside the inner shell on the one side of the journal bearing device with the radial gap.

[0013] [Effects of the invention]

[0014] According to the cold and heat power generation device of the present disclosure, the pressure inside the inner casing at the position where the thrust bearing device is arranged can be reduced, and the reduction in the performance of the power generator can be suppressed by reducing the wind loss (loss) of the thrust bearing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic configuration diagram schematically showing the overall configuration of a cold-heat power generation system including a cold-heat power generation device according to an embodiment of the present disclosure.

[0016] Figure 2 This is a schematic cross-sectional view of a cold-thermal power generation device according to an embodiment of the present disclosure.

[0017] Figure 3 This is an enlarged cross-sectional view of the second-stage turbine and its surroundings of the cold-heat power generation device according to one embodiment of the present disclosure.

[0018] Figure 4 yes Figure 2 A schematic diagram of the AA section of the cold and heat power generation device shown.

[0019] Figure 5 yes Figure 2 A schematic diagram of the BB cross section of the cold and heat power generation device shown. DETAILED DESCRIPTION

[0020] Hereinafter, several embodiments of the present disclosure will be described with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, but are merely illustrative examples.

[0021] For example, expressions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" that indicate a relative or absolute configuration not only strictly indicate such a configuration, but also indicate a state of relative displacement at an angle or distance with a tolerance or a degree that can achieve the same function.

[0022] For example, expressions such as “same”, “equal” and “homogeneous” indicating a state in which things are equal not only indicate a state of being strictly equal but also indicate a state in which there is a tolerance or a difference to the extent that the same function can be obtained.

[0023] For example, expressions indicating shapes such as a quadrilateral and a cylinder not only indicate shapes such as a quadrilateral and a cylinder in a strict geometric sense, but also indicate shapes including concave and convex portions, chamfered portions, etc. within a range that can obtain the same effect.

[0024] On the other hand, the expression “having”, “including” or “having” a constituent element does not mean an exclusive expression excluding the presence of other constituent elements.

[0025] In addition, the same reference numerals are given to the same structures and the description thereof may be omitted.

[0026] (Cold and heat power generation system)

[0027] Figure 1 This is a schematic configuration diagram schematically showing the overall configuration of a cold-heat power generation system including a cold-heat power generation device according to an embodiment of the present disclosure.

[0028] The cold and heat power generation system 100 according to one embodiment of the present embodiment is a cold and heat power generation system 100 for recovering the cold and heat energy of the liquefied gas as electric power via a heat medium for heating the liquefied gas.

[0029] The cold and heat power generation system 100 is not particularly limited, and may be installed, for example, on a floating structure 10A on water or a liquefied gas base 10B on land, which will be described below.

[0030] The floating structure 10A is a structure that can float on water. The floating structure 10A has a propulsion device configured to drive a propeller or other propulsion device, including a ship that can move by itself by driving the propulsion device and a floating body without a propulsion device. In the floating structure 10A, liquid liquefied gas is stored, and the liquid liquefied gas is heated by seawater or the like to be vaporized and flows into an engine (not shown) to obtain propulsion. When the liquefied gas is vaporized, the cold and heat energy is not discarded into the seawater through the cold and heat power generation system 100, but is recovered as electricity through the cold and heat power generation device 1 described later.

[0031] In the land-based liquefied gas base 10B, liquefied gas transported by LNG carriers is received and stored. When supplying to a liquefied gas supply destination such as a city gas or a thermal power plant, the liquefied gas is heated by seawater or the like to be restored to gas. When the liquefied gas is gasified, the cold and heat energy is not discarded into the seawater by the cold and heat power generation system 100, but is recovered as electric power by the cold and heat power generation device 1 described later.

[0032] Here, in the following embodiments, a case where the cold and heat power generation system 100 of the present disclosure is installed in the ship 10 using liquefied gas as fuel in the above-mentioned floating structure 10A is described as an example.

[0033] like Figure 1 As shown, the cold and heat power generation system 100 includes: a cold and heat power generation device 1, a liquefied gas supply line 2, a condenser 3, a heating fluid supply line 4, a cold and heat pump 5, an evaporator 7, and a heat medium circulation line 9. The cold and heat power generation device 1, the condenser 3, the cold and heat pump 5, and the evaporator 7 are respectively connected through the heat medium circulation line 9. In addition, the liquefied gas supply line 2 is connected to the condenser 3. In addition, the heating fluid supply line 4 is connected to the evaporator 7. The heat medium circulation line 9, the liquefied gas supply line 2, and the heating fluid supply line 4 each include a flow path such as a pipeline for the flow of fluid. And, it is configured so that the heat medium circulates in the heat medium circulation line 9 while changing its state to liquid or gas, thereby driving the cold and heat power generation system 100.

[0034] The heat medium circulation line 9 is configured to circulate a heat medium having a lower freezing point than water. In the following, liquefied natural gas (LNG) is cited as an example for explanation as a specific example of liquefied gas, and propane is cited as an example for explanation as a specific example of the heat medium flowing in the heat medium circulation line 9, but the present disclosure can also be applied to liquefied gas (liquefied hydrogen, etc.) other than liquefied natural gas, and can also be applied to the case where a heat medium other than propane, such as R1234yf or R1234ze, is used as the heat medium flowing in the heat medium circulation line 9.

[0035] The condenser 3 is configured to condense the working fluid (heat medium) by exchanging heat between the heat medium and the liquefied gas. A heating side pipeline connected to the heat medium circulation pipeline 9 and into which the heat medium circulating in the heat medium circulation pipeline 9 flows, and a heated side pipeline connected to the liquefied gas supply pipeline 2 and into which the liquefied gas flowing in the liquefied gas supply pipeline 2 flows are provided inside the condenser 3. Furthermore, the heat medium flowing in the heating side pipeline and the liquefied gas flowing in the heated side pipeline are configured to exchange heat. In the condenser 3, the heat medium is cooled and condensed by heat exchange, and the liquefied gas is heated.

[0036] The liquefied gas supply line 2 on the upstream side of the condenser 3 is connected to a liquefied gas pump 22 , and the liquefied gas storage device 21 is connected further upstream of the liquefied gas pump 22 .

[0037] The liquid liquefied gas stored in the liquefied gas storage device 21 is transported to the liquefied gas supply pipeline 2 by driving the liquefied gas pump 22, flows from the upstream side to the downstream side in the liquefied gas supply pipeline 2, and is supplied to the condenser 3. Furthermore, the liquefied gas vaporized by the heat exchange inside the condenser 3 flows through the heated side pipeline, flows again in the liquefied gas supply pipeline 2, and is supplied as fuel to the engine (not shown) of the ship 10 provided on the downstream side of the condenser 3.

[0038] The cooling and heating pump 5 is configured to increase the pressure of the heat medium supplied from the condenser 3. The cooling and heating pump 5 connected to the heat medium circulation line 9 is driven to circulate the heat medium in the heat medium circulation line 9. The heat medium flows from the condenser 3 to the cooling and heating pump 5, from the cooling and heating pump 5 to the evaporator 7, from the evaporator 7 to the cooling and heating power generation device 1, and from the cooling and heating power generation device 1 to the condenser 3.

[0039] The cooling and heating pump 5 is not particularly limited in form as long as it can increase the pressure of the heat medium. For example, a turbine pump (centrifugal pump, diagonal flow pump, axial flow pump, etc.), a positive displacement pump (reciprocating pump, rotary pump), a special pump (submersible motor pump), etc. can be appropriately selected according to the embodiment.

[0040] The evaporator 7 is configured to evaporate the heat medium by exchanging heat between the heat medium pressurized by the cold and hot pump 5 and the heating fluid introduced from the outside of the cold and hot power generation system 100. A heat medium heated side pipeline and a heat medium heating side pipeline are provided inside the evaporator 7. The heat medium heated side pipeline is connected to the heat medium circulation pipeline 9 for the heat medium pressurized by the cold and hot pump 5, and the heat medium heating side pipeline is connected to the heating fluid supply pipeline 4 for the heating fluid introduced from the outside of the cold and hot power generation system 100. The heat medium flowing in the heat medium heated side pipeline is heat-exchanged with the heating fluid flowing in the heat medium heating side pipeline. In the evaporator 7, the heat medium is heated and evaporated by heat exchange, and the heating fluid is cooled.

[0041] The heating fluid supply line 4 upstream of the evaporator 7 is connected to a heating fluid pump 42. The heating fluid supply line 4 is connected to a heating fluid supply source upstream of the heating fluid pump 42 so as to introduce heating fluid from outside the cold and heat power generation system 100.

[0042] The heating fluid is driven by the heating fluid pump 42 to be transported from the heating fluid supply source to the heating fluid supply pipeline 4, flows from the upstream side to the downstream side in the heating fluid supply pipeline 4, and is supplied to the evaporator 7. The heating fluid cooled by the heat exchange inside the evaporator 7 flows through the heat medium heating side pipeline, flows again in the heating fluid supply pipeline 4, and is discharged to the outside of the cold and heat power generation system 100.

[0043] The “heating fluid” mentioned above may be any fluid that heats the heat medium circulating in the heat medium circulation line 9 in the evaporator 7 , and may be steam, warm water, seawater, engine cooling water, or water at room temperature.

[0044] When the cold and heat power generation system 100 is mounted on the ship 10 , water easily available in the ship 10 (for example, off-board water such as seawater, engine cooling water used to cool the engine of the ship 10 , etc.) can be appropriately used as the heating fluid.

[0045] The cold and heat power generation device 1 is configured to be driven by the gaseous heat medium generated in the evaporator 7 .

[0046] In addition, the cold-heat power generation device 1 includes a generator 8. The gaseous heat medium generated by the evaporator 7 rotates a rotor shaft 11 of the cold-heat power generation device 1 described later, thereby driving the generator 8. The gaseous heat medium after driving the cold-heat power generation device 1 flows in the heat medium circulation line 9 toward the above-mentioned condenser 3 provided on the downstream side of the cold-heat power generation device 1.

[0047] (Structure of the cold and heat power generation device)

[0048] Figure 2 It is a schematic cross-sectional view of the cold-thermal power generation device 1 according to one embodiment of the present disclosure. Figure 3 It is an enlarged cross-sectional view of the second-stage turbine device 24 and its surroundings of the cold-thermal power generation device 1 according to one embodiment of the present disclosure. Figure 4 yes Figure 2 A schematic diagram of the AA section of the cold and heat power generation device shown.

[0049] Hereinafter, the upstream side in the flow direction of the heat medium in the cold and heat power generation device 1 may be referred to as the upstream side, and the downstream side in the flow direction of the heat medium in the cold and heat power generation device 1 may be referred to as the downstream side.

[0050] In addition, the radial direction of the cold / thermal power generation device 1 may be expressed as a radial direction, and the circumferential direction of the cold / thermal power generation device 1 may be expressed as a circumferential direction.

[0051] In addition, the direction along the axis CA of the cold and heat power generation device 1 may be simply represented as the axial direction.

[0052] like Figure 2 As shown, the cold and heat power generation device 1 of several embodiments includes: a rotor shaft 11, a generator 8, a casing 6, a first-stage turbine device 23, a second-stage turbine device 24, a first journal bearing device 103, a second journal bearing device 104 and a thrust bearing device 102.

[0053] (rotor shaft)

[0054] In the illustrated embodiment, the rotor shaft 11 includes: a shaft portion 111 having a length direction along the axis CA of the cold and heat power generation device 1; a one-side disk portion 113A extending along the radial direction of the rotor shaft 11 on one side (upstream side) of the shaft portion 111 and supporting the first-stage moving blades 23B described later; and a second-side disk portion 113B extending along the radial direction of the rotor shaft 11 on the other side (downstream side) of the shaft portion 111 and supporting the second-stage moving blades 24B described later. The axis of the rotor shaft 11 coincides with the axis CA of the cold and heat power generation device 1 and the axis of the housing 6.

[0055] In addition, Figure 2 In the illustrated embodiment, the axis of the rotor shaft 11 coincides with the horizontal direction, and the center of one end of the shaft portion 111 and the center of the other end of the shaft portion 111 are arranged at the same height level in the vertical direction.

[0056] The one side disk 113A and the other side disk 113B are fixed to the shaft 111 by nuts and protrude in a disc shape radially outward from the outer surface of the shaft 111. The portion of the shaft 111 to which the one side disk 113A and the other side disk 113B are attached has a smaller diameter than other portions.

[0057] (dynamo)

[0058] The generator 8 is configured to include a motor rotor 81 supported on the outer peripheral surface of the rotor shaft 11 and a motor stator 82 disposed to face the motor rotor 81 .

[0059] In the illustrated embodiment, the motor rotor 81 is integrally formed on the outer peripheral surface of the rotor shaft 11, and the two are integrally structured. However, the motor rotor 81 and the rotor shaft 11 may be formed separately, and the motor rotor 81 is supported on the outer peripheral surface of the rotor shaft. The motor stator 82 is supported on the inner peripheral surface 611 of the inner housing 61 described later, and is arranged radially outward of the motor rotor 81.

[0060] (case)

[0061] The housing 6 is composed of an inner housing 61 that accommodates the rotor shaft 11 , and an outer housing 62 that is disposed on the outer peripheral side of the inner housing 61 and accommodates the inner housing 61 .

[0062] The inner housing 61 has a length direction along the axial direction of the cold and heat power generation device 1, and is arranged between the first-stage moving blades 23B and the second-stage moving blades 24B in the axial direction of the cold and heat power generation device 1. A space 610 is formed inside the inner housing 61, which accommodates the shaft portion 111 and the generator 8 (in the example shown in the figure, the motor rotor 81 and the motor stator 82).

[0063] In addition, a heat medium flow path 63 is defined between the inner casing 61 and the outer casing 62. The heat medium flow path 63 is defined between the outer peripheral surface 612 of the inner casing 61 and the inner peripheral surface 621 of the outer casing 62, and is configured to extend along the axial direction of the rotor shaft 11 from the upstream of the first-stage stationary blades 23A to the downstream of the second-stage moving blades 24B.

[0064] In the illustrated embodiment, the heat medium passage 63 has a longitudinal direction along the axial direction of the cold and heat power generation device 1 and has an annular cross section surrounding the inner casing 61. The heat medium is guided from one side to the other side between the outer casing 62 and the inner casing 61.

[0065] In the illustrated embodiment, a one-side cover 66A is arranged on one side (upstream side) of the inner casing 61, and an other-side cover 66B is arranged on the other side (downstream side). The one-side cover 66A is arranged on one side of the inner casing body 61A so as to cover the end of one side of the shaft portion 111 on the axial side of the first-stage moving blades 23B. In addition, the other-side cover 66B is arranged on the other side of the inner casing body 61A so as to cover the end of the other side of the shaft portion 111 on the other side of the axial side of the second-stage moving blades 24B.

[0066] The heat medium passage 63 extends toward one side of the inner case 61 through a space defined between the one side cover 66A and the outer case 62. Similarly, the heat medium passage 63 extends toward the other side of the inner case 61 through a space defined between the other side cover 66B and the outer case 62.

[0067] In addition, a one-side introduction path 64A for introducing heat medium into the heat medium flow path 63 from one side in the axial direction is formed on one side of the heat medium flow path 63. The one-side introduction path 64A is defined by the inner surface of an inlet case 65A connected to one side of the outer case 62 on the axial side of the inner case 61.

[0068] In addition, a second discharge path 64B for discharging the heat medium from the heat medium path 63 to the second side in the axial direction is formed on the second side of the heat medium path 63. The second discharge path 64B is defined by the inner surface of an outlet case 65B connected to the second side of the outer case 62 at the second side of the inner case 61 in the axial direction.

[0069] Then, the heat medium introduced from the one side introduction path 64A to the heat medium flow path 63 acts on the first stage moving blades 23B after passing through the first stage stationary blades 23A, and applies a rotational force to the rotor shaft 11, thereby driving the first stage turbine device 23. While the heat medium that has passed through the first stage moving blades 23B flows through the heat medium flow path 63, it exchanges heat with the heat generated in the generator 8 (motor rotor 81, motor stator 82) accommodated in the space 610 formed inside the inner shell 61. In other words, the heat medium flowing in the heat medium flow path 63 absorbs the heat generated in the generator 8. As a result, the generator 8 is cooled, and the heat medium flowing in the heat medium flow path 63 is heated.

[0070] After the heated heat medium passes through the second-stage stationary blades 24A, it acts on the second-stage moving blades 24B to apply a rotational force to the rotor shaft 11, thereby driving the second-stage turbine device 24. That is, the heat medium heated by the heat exchange with the generator 8 in the heat medium flow path 63 flows into the second-stage turbine device 24, and the heated heat medium drives the second-stage turbine device 24. The heat medium flowing through the second-stage turbine device 24 is discharged from the heat medium flow path 63 to the other side discharge path 64B, and flows out to the outside of the cold and heat power generation device 1.

[0071] (First stage turbine device)

[0072] The first-stage turbine device 23 is arranged in the heat medium flow path 63. The first-stage turbine device 23 is configured to include: a first-stage moving blade 23B provided on the rotor shaft 11 side of the motor rotor 81; and a first-stage stationary blade 23A supported on the inner peripheral surface 621 of the outer casing 62 or the inner casing 61 on the rotor shaft 11 side of the first-stage moving blade 23B.

[0073] In the illustrated embodiment, the first-stage moving blades 23B are installed on the outer peripheral surface of the above-mentioned one side disk portion 113A at intervals in the circumferential direction. In addition, the first-stage stationary blades 23A are supported by the inner peripheral surface 621 of the outer casing 62 and are provided at intervals in the circumferential direction on the inner peripheral surface 621. In addition, in other embodiments, the first-stage stationary blades 23A may be supported by the inner casing 61 and provided at intervals in the circumferential direction, or may be supported by both the inner peripheral surface 621 of the outer casing 62 and the inner casing 61.

[0074] (Second stage turbine device)

[0075] The second-stage turbine device 24 is arranged in the heat medium flow path 63. The second-stage turbine device 24 is configured to include: a second-stage stationary blade 24A supported on the inner peripheral surface 621 of the outer casing 62 or the outer peripheral surface 612 of the inner casing 61 on the other side of the rotor shaft 11 than the motor rotor 81; and a second-stage moving blade 24B provided on the other side of the rotor shaft 11 than the second-stage stationary blade 24A.

[0076] In the illustrated embodiment, the second-stage moving blades 24B are installed on the outer circumferential surface of the other side disk portion 113B at intervals in the circumferential direction. In addition, the second-stage stationary blades 24A are supported on the inner circumferential surface 621 of the outer casing 62 and are provided on the inner circumferential surface 621 at intervals in the circumferential direction. In addition, in other embodiments, the second-stage stationary blades 24A may be supported on the outer circumferential surface 612 of the inner casing 61 and provided on the outer circumferential surface 612 at intervals in the circumferential direction, or may be supported on both the inner circumferential surface 621 of the outer casing 62 and the outer circumferential surface 612 of the inner casing 61.

[0077] (First journal bearing assembly)

[0078] The first journal bearing device 103 is disposed inside the inner housing 61 on the other side of the generator 8 , and includes a main bearing 103A and an auxiliary bearing 103B.

[0079] In the illustrated embodiment, a main bearing 103A and an auxiliary bearing 103B that rotatably support the rotor shaft 11 are housed in a space 610 formed inside the inner housing 61. The main bearing 103A is disposed on the other side of the motor rotor 81. The auxiliary bearing 103B is disposed on the other side of the main bearing 103A.

[0080] In addition, the first journal bearing device 103 may include only the main bearing 103A.

[0081] (Second journal bearing unit)

[0082] The second journal bearing device 104 is disposed inside the inner housing 61 on one side of the generator 8 , and includes a main bearing 104A and an auxiliary bearing 104B.

[0083] In the illustrated embodiment, a main bearing 104A and an auxiliary bearing 104B that support the rotor shaft 11 so as to be rotatable are accommodated in a space 610 formed inside the inner housing 61. The main bearing 104A is arranged on one side of the motor rotor 81. The auxiliary bearing 104B is arranged on one side of the main bearing 104A. In addition, as the second journal bearing device 104, only the main bearing 104A may be included. In addition, in the case of a cold and heat power generation device 1 that is configured to support the rotor shaft 11 so as to be rotatable only by the first journal bearing device 103, the second journal bearing device 104 may not be provided.

[0084] In one embodiment, the main bearings 103A and 104A may be formed of magnetic bearings, and the auxiliary bearings 103B and 104B may be formed of ball bearings. When the cold and hot power generation device 1 stops or trips due to a fault, the auxiliary bearings 103B and 104B support the rotor shaft 11 to prevent the main bearings 103A and 104A from contacting the rotor shaft 11.

[0085] (Thrust bearing device)

[0086] The thrust bearing device 102 is arranged inside the inner housing 61 on one side of the first journal bearing device 103. The thrust bearing device 102 includes a thrust bearing 102A on one side and a thrust bearing 102B on the other side arranged in a space 610 formed inside the inner housing 61, and receives the load (thrust) in the axial direction of the rotor shaft 11.

[0087] In the illustrated embodiment, Figure 2 and Figure 3 As shown, the rotor shaft 11 further includes a thrust ring 112 extending radially at one side of the first journal bearing device 103 and at the other side of the generator 8 inside the inner housing 61. The one-side thrust bearing 102A abuts against the one side surface 112A of the thrust ring 112 provided on the rotor shaft 11. The other-side thrust bearing 102B abuts against the other side surface 112B of the thrust ring 112.

[0088] In other embodiments, the thrust bearing device 102 and the thrust ring 112 may be arranged on one side of the generator 8 inside the inner housing 61 .

[0089] In addition, the thrust bearing device 102 (the one-side thrust bearing 102A and the other-side thrust bearing 102B) may be formed of a magnetic bearing.

[0090] (Radial clearance)

[0091] In addition, if Figure 3As shown, a radial gap 241 connected to the heat medium flow path 63 downstream of the second-stage stationary blades 24A is defined between the other end surface 613 of the inner casing 61 and the other disk portion 113B.

[0092] In the illustrated embodiment, the radial gap 241 is connected between the second-stage stationary blades 24A and the second-stage moving blades 24B in the heat medium flow path 63 and has an annular cross section surrounding the rotor shaft 11. The radial gap 241 has a uniform width in the axial direction and extends in the radial direction.

[0093] (Equalized pressure flow path)

[0094] Furthermore, in several embodiments of the cold and heat power generation device 1, as Figure 3 As shown, at least one pressure equalizing passage 40 is formed in the inner housing 61 for connecting a first space 614 located on the side closer to the first journal bearing device 103 inside the inner housing 61 with the radial gap 241 .

[0095] In the illustrated embodiment, Figure 3 As shown, the pressure equalizing flow path 40 includes: a first space side opening 40A opened to the first space 614, a radial gap side opening 40B opened to the other side end surface 613, a radial flow path 401 extending radially from the first space side opening 40A, an axial flow path 402 connected to the radial flow path 401 and extending in the axial direction of the rotor shaft 11, and an other side flow path 403 connecting the axial flow path 402 and the radial gap side opening 40B. The other side flow path 403 extends in a manner that the distance from the axis of the rotor shaft 11 increases as it approaches one side from the radial gap side opening 40B.

[0096] The first space side opening 40A is located radially outward relative to the radially inner end 102B1 of the other side thrust bearing 102B as a stationary member. Therefore, under the influence of the rotation of the rotor shaft 11, the heat medium flowing from the upstream to the downstream of the thrust bearing device 102 can be introduced into the first space side opening 40A.

[0097] In addition, the radial flow path 401, the axial flow path 402 and the other side flow path 403 have circular cross-sectional shapes and extend in a manner such that their flow path areas are constant. In addition, the radial flow path 401, the axial flow path 402 and the other side flow path 403 have the same flow path areas.

[0098] According to the cold and heat power generation device 1 of the present disclosure, the heat medium introduced into the heat medium flow path 63 from the one side introduction path 64A is introduced into the second stage turbine device 24 through the first stage stationary blades 23A and the first stage moving blades 23B of the first stage turbine device 23. The heat medium introduced into the second stage turbine device 24 passes through the second stage stationary blades 24A and the second stage moving blades 24B of the second stage turbine device and is discharged from the other side discharge path 64B.

[0099] In addition, a part of the heat medium does not flow into the heat medium flow path 63 as a leakage flow, but flows into the inner shell 61. The heat medium that has flowed into the inner shell 61 flows through the first space 614 and the pressure equalizing flow path 40 in this order inside the inner shell 61, and flows into the radial gap 241 from the radial gap side opening 40B.

[0100] Since the heat medium passes through the first-stage stationary blades 23A, the first-stage moving blades 23B, and the second-stage stationary blades 24A in the heat medium flow path 63 in sequence, the pressure of the heat medium flow path 63 on the downstream side of the second-stage stationary blades 24A is lower than the inlet portion of the heat medium flow path 63. In addition, the pressure of the heat medium flow path 63 on the downstream side of the second-stage stationary blades 24A is lower than the pressure at the radial gap 241 of the heat medium that has passed through the inside of the inner casing 61. Therefore, the heat medium that has flowed into the radial gap 241 through the inner casing 61 flows from the radial inside to the outside of the radial gap 241, and flows out to the heat medium flow path 63 on the downstream side of the second-stage stationary blades 24A. In addition, the pressure inside the inner casing 61 is reduced, and the pressure around the thrust bearing device 102 is also reduced, so that the wind loss (loss) of the thrust bearing device 102 can be reduced, and the reduction in the performance of the generator can be suppressed.

[0101] The pressure inside the inner housing 61 becomes lower in the downstream due to the pressure loss caused by the second journal bearing device 104, the motor rotor 81, the motor stator 82, etc. In the present embodiment, the thrust bearing device 102 is arranged on the other side (downstream side) of the generator 8, so the pressure around the thrust bearing device 102 drops, which can further reduce the wind loss (loss) of the thrust bearing device 102 and suppress the decline in the performance of the generator.

[0102] In addition, the first space 614 may be formed on the other side of the thrust bearing device 102 .

[0103] According to such a structure, the equalizing flow path 40 connects the first space 614 with the radial gap 241 without passing through the radially outer side of the thrust bearing device 102 having a larger diameter. Therefore, compared with the case where the equalizing flow path 40 passes through the radially outer side of the thrust bearing device 102, the outer diameter of the inner shell 61 can be reduced, and the overall device of the cold and heat power generation device 1 can be simplified.

[0104] In addition, if Figure 4 As shown, the pressure equalizing flow path 40 may be formed in plurality at intervals in the circumferential direction. In this case, the plurality of pressure equalizing flow paths 40 may be arranged at equal intervals in the circumferential direction. Figure 4 In the figure, the cross-sectional shape of the pressure equalizing flow path 40 is circular, but it may be a non-circular shape such as an ellipse or a rectangle.

[0105] Figure 5 yes Figure 2 A schematic diagram of the cross section BB of the cold and heat power generation device 1 is shown.

[0106] In some embodiments, such as Figure 5 As shown, the other side disk portion 113B has a through hole 50 that connects the radial gap 241 with a space 615 on the other side of the second stage moving blade 24B.

[0107] The pressure on the downstream side of the second-stage moving blade 24B is lower than the pressure of the radial gap 241 defined on the upstream side of the second-stage moving blade 24B. Therefore, by connecting the radial gap 241 with the space on the downstream side of the second-stage moving blade 24B through the through hole 50, the heat medium in the radial gap 241 can flow out to the space 615, thereby reducing the pressure inside the inner housing 61 where the thrust bearing device 102 is arranged. As a result, the wind loss (loss) of the thrust bearing device 102 can be reduced.

[0108] The through hole 50 is formed facing the radial gap opening 40B. Therefore, the heat medium flowing out from the radial gap opening 40B of the pressure equalizing flow path 40 can flow out to the space 615 through the through hole 50 of the other side disk portion 113B, thereby reducing the pressure inside the inner housing 61.

[0109] like Figure 5 As shown, a plurality of through holes 50 may be formed at intervals in the circumferential direction. In this case, the plurality of through holes 50 may be arranged at equal intervals in the circumferential direction. Figure 5 In the embodiment, the cross-sectional shape of the through hole 50 is circular, but it may be a non-circular shape such as an ellipse or a rectangle.

[0110] In the illustrated embodiment, the first space side opening 40A and the radial gap side opening 40B corresponding to the same equalizing flow path 40 exist on the same axial cross section including the axis of the rotor shaft 11. That is, the equalizing flow path 40 is formed without turning with respect to the axis CA of the cold and heat power generation device 1. According to such a structure, the equalizing flow path 40 can be easily formed in the inner housing 61.

[0111] like Figure 2As shown, the cold and heat power generation device 1 further includes a seal portion 26 for sealing between the rotor shaft 11 and the inner casing 61 on the other side of the first-stage turbine device 23 and on the one side of the generator 8 .

[0112] In the illustrated embodiment, the seal portion 26 seals the gap between the inner circumferential surface 611 of the inner casing 61 and the outer circumferential surface of the shaft portion 111 of the rotor shaft 11 at the other side of the first-stage turbine device 23 and at one side of the generator 8. The seal portion 26 may include a mechanical seal or a labyrinth seal provided by processing the shaft portion 111 or the inner casing 61 with recesses and protrusions.

[0113] According to such a structure, the heat medium leaking from the high-pressure area of ​​the first-stage turbine device 23 to the inside of the inner casing 61 can be sealed, so the pressure inside the inner casing 61 can be maintained lower than when no sealing member is provided. As a result, the wind loss (loss) generated inside the inner casing 61 by the thrust bearing device 102 can be reduced.

[0114] Furthermore, since leakage of the heat medium passing through the first-stage moving blades 23B into the inner casing 61 is suppressed, a reduction in the heat medium flowing through the heat medium flow path 63 can be suppressed compared to a case where no sealing member is provided, and the efficiency of the second-stage turbine device 24 can be improved.

[0115] In several embodiments, such as Figure 2 and Figure 3 As shown, the above-mentioned cold and heat power generation device 1 does not include a component for sealing between the rotor shaft 11 and the inner housing 61 at the other side of the inner housing 61 than the generator 8. In other words, a sealing component such as a mechanical seal or a labyrinth seal like the above-mentioned sealing portion 26 is not provided at the other side of the inner housing 61 than the generator 8.

[0116] According to such a configuration, since there is no sealing member that prevents the heat medium from leaking from the inside of the inner casing 61 to the low-pressure region of the second-stage turbine device 24, the pressure inside the inner casing 61 can be maintained lower than when a sealing member is provided. As a result, the thrust acting on the rotor shaft 11 and the wind loss (loss) caused by the thrust bearing device 102 generated inside the inner casing 61 can be reduced.

[0117] The present disclosure is not limited to the above-described embodiments, and also includes modified embodiments of the above-described embodiments and embodiments in which these embodiments are appropriately combined.

[0118] The contents described in the above-mentioned several embodiments can be understood, for example, as follows.

[0119] (1) A heat and cold power generation device (1) of one embodiment is provided in a heat medium circulation pipeline, the heat medium circulation pipeline being configured to circulate a heat medium for heating liquefied gas, and the heat and cold power generation device (1) comprises:

[0120] A rotor shaft (11);

[0121] A generator (8) comprising a motor rotor (81) supported on the outer peripheral surface of the rotor shaft (11) and a motor stator (82) arranged to face the motor rotor (81);

[0122] An inner casing (61) accommodating the generator (8);

[0123] An outer shell (62) is arranged on the outer peripheral side of the inner shell (61), and defines a heat medium flow path (63) between the outer shell (62) and the inner shell (61);

[0124] A first-stage turbine device (23) is arranged in the heat medium flow path (63) and is arranged on the axial side of the rotor shaft (11) relative to the generator (8);

[0125] a second-stage turbine device (24) arranged in the heat medium flow path (63) and arranged on the other side of the rotor shaft (11) than the generator (8);

[0126] a journal bearing device (a first journal bearing device 103) arranged on the inner circumference side of the inner housing (61) closer to the other side than the generator (8); and

[0127] The thrust bearing device (102) is arranged on the inner peripheral side of the inner housing (61) closer to the one side than the journal bearing device (103).

[0128] The second-stage turbine device (24) includes a second-stage stationary blade (24A) and a second-stage moving blade (24B) provided on the other side of the second-stage stationary blade (24A).

[0129] The rotor shaft (11) includes a disk portion (113B) extending in the radial direction and supporting the second-stage moving blades (24B) of the second-stage turbine device (24).

[0130] A radial gap (241) connected to the heat medium flow path (63) on the other side of the second-stage stationary blade (24A) is defined between the other end surface (613) of the inner casing (61) and the disk portion (113B).

[0131] At least one equalizing flow path (40) is formed in the inner shell (61), and the equalizing flow path (40) connects a first space (614) inside the inner shell (61) on the side closer to the journal bearing device (103) with the radial gap (241).

[0132] According to the cold and heat power generation device disclosed in the present invention, a radial gap connected to the downstream side of the second-stage stationary blade in the heat medium flow path is divided, and at least one equalizing flow path is formed in the inner shell for connecting the first space on the side of the journal bearing device in the inner shell with the radial gap. The heat medium flows from the first space through the equalizing flow path, from the radial inside to the outside of the radial gap, and flows out to the heat medium flow path.

[0133] The heat medium flows in the heat medium flow path defined between the inner casing and the outer casing in the order of the first stage turbine device and the second stage turbine device. That is, the pressure of the radial gap defined downstream of the second stage stationary blade is lower than the pressure upstream of the second stage stationary blade.

[0134] Therefore, the pressure equalizing passage connects the first space with the radial gap, thereby reducing the pressure inside the inner housing where the thrust bearing device is arranged. Therefore, the wind loss (loss) of the thrust bearing device can be reduced, and the reduction of the generator performance can be suppressed.

[0135] (2) Another embodiment of a cold and heat power generation device (1) Based on the cold and heat power generation device described in (1),

[0136] The thrust bearing device (102) is arranged closer to the other side than the generator (8).

[0137] The pressure inside the inner shell body is lower than the pressure on the one side of the generator. According to such a structure, the thrust bearing device is arranged on the other side of the generator, thereby reducing the pressure in the area where the thrust bearing device is arranged, and reducing the wind loss (loss) of the thrust bearing device.

[0138] (3) Another embodiment of a cold-heat power generation device (1) is a cold-heat power generation device according to (2),

[0139] The first space (614) is divided at a position closer to the other side than the thrust bearing device (102).

[0140] According to such a structure, the equalizing flow path connects the first space with the radial gap without passing through the radially outer side of the thrust bearing device with a larger diameter. Therefore, compared with the case where the equalizing flow path passes through the radially outer side of the thrust bearing device, the outer diameter of the inner shell body can be reduced, and the overall device of the cold and heat power generation device can be simplified.

[0141] (4) A cold-heat power generation device according to another embodiment (1) is a cold-heat power generation device according to (3),

[0142] The above-mentioned journal bearing device (103) comprises a main bearing (103A) and an auxiliary bearing (103B).

[0143] According to such a configuration, even when the main bearing cannot support the rotor shaft due to a stop or failure of the cold and heat power generation device, the rotor shaft can still be supported by the auxiliary bearing.

[0144] (5) A cold-heat power generation device according to another embodiment (1) is the cold-heat power generation device according to any one of (1) to (4),

[0145] The disk portion (113B) has at least one through hole (50) penetrating the rotor shaft (11) in the axial direction.

[0146] The pressure on the downstream side of the second-stage moving blades is lower than the pressure of the radial gap defined on the upstream side of the second-stage moving blades. Therefore, according to such a structure, the through hole connects the radial gap with the space on the downstream side of the second-stage moving blades, thereby allowing the heat medium in the radial gap to flow out to the space, thereby reducing the pressure inside the inner shell where the thrust bearing device is arranged. As a result, the wind loss (loss) of the thrust bearing device 102 can be reduced.

[0147] (6) A cold-heat power generation device according to another embodiment (1) is a cold-heat power generation device according to any one of (1) to (5),

[0148] The cold and heat power generation device (1) further includes a sealing portion (26) for sealing between the rotor shaft (11) and the inner casing (61) at a position closer to the other side than the first-stage turbine device (23) and closer to the one side than the generator (8).

[0149] According to such a structure, the heat medium leaking from the high-pressure area of ​​the first-stage turbine device to the inside of the inner casing can be sealed, so the pressure inside the inner casing can be maintained lower than when no sealing member is provided. As a result, the thrust acting on the rotor shaft and the wind loss (loss) caused by the thrust bearing device inside the inner casing can be reduced.

[0150] Furthermore, since leakage of the heat medium passing through the first-stage moving blades into the inner casing body can be suppressed, a reduction in the heat medium flowing through the heat medium flow path can be suppressed compared to a case where no sealing member is provided, and the efficiency of the second-stage turbine device can be improved.

[0151] (7) A cold-heat power generation device according to another embodiment (1) is a cold-heat power generation device according to (6),

[0152] The cold and heat power generation device (1) does not include a component for sealing between the rotor shaft (11) and the inner casing (61) at the other side of the generator (8) inside the inner casing (61).

[0153] According to such a configuration, since there is no sealing member that prevents the heat medium from leaking from the inside of the inner casing to the low-pressure region of the second-stage turbine device, the pressure inside the inner casing can be maintained lower than when a sealing member is provided. As a result, the thrust acting on the rotor shaft and the wind loss (loss) caused by the thrust bearing device generated inside the inner casing body can be reduced.

[0154] Description of Reference Numerals

[0155] 1. Cold and heat power generation device

[0156] 2 Liquefied gas supply pipeline

[0157] 3 Condenser

[0158] 4 Heating fluid supply line

[0159] 5. Cold and hot pumps

[0160] 6 Housing

[0161] 61 Inner shell

[0162] 62 Outer shell

[0163] 7 Evaporator

[0164] 8. Generator

[0165] 81 Motor rotor

[0166] 82 Motor stator

[0167] 9 Heat medium circulation pipeline

[0168] 10 Ships

[0169] 10A Floating Structure

[0170] 10B Liquefied gas matrix

[0171] 11 Rotor shaft

[0172] 111 Shaft

[0173] 112 Thrust ring

[0174] 112A Side

[0175] 112B The other side

[0176] 113A One side plate

[0177] 113B Other side plate

[0178] 21 Liquefied gas storage device

[0179] 22 Pumps for liquefied gas

[0180] 23 First stage turbine

[0181] 23A First stage stationary blades

[0182] 23B First stage moving blades

[0183] 24 Second stage turbine

[0184] 24A Second stage stationary blades

[0185] 24B Second stage moving blades

[0186] 241 Radial clearance

[0187] 26 Sealing part

[0188] 40 Pressure equalization flow path

[0189] 40A First space side opening

[0190] 40B Radial clearance side opening

[0191] 401 Radial Flow Path

[0192] 402 Axial Flow Path

[0193] 403 Other side flow path

[0194] 42 Pumps for heating fluids

[0195] 50 Through hole

[0196] 63 Heat medium flow path

[0197] 64A One side access road

[0198] 64B Other side discharge route

[0199] 65A Inlet Housing

[0200] 65B outlet housing

[0201] 66A One side cover

[0202] 66B Other side cover

[0203] 100 Cold and heat power generation system

[0204] 102 Thrust bearing device

[0205] 102A Thrust bearing on one side

[0206] 102B Thrust bearing on the other side

[0207] 102B1 end

[0208] 103 First journal bearing assembly

[0209] 103A Main bearing

[0210] 103B Auxiliary bearing

[0211] 104 Second journal bearing assembly

[0212] 104A Main bearing

[0213] 104B Auxiliary bearing

[0214] 610 Space

[0215] 611 Inner Surface

[0216] 612 outer surface

[0217] 613 Other side end

[0218] 615 The Space on the Other Side

[0219] 616 Circumferential clearance

[0220] 621 Inner Surface

[0221] CA axis.

Claims

1. A heat and cold power generation device, provided in a heat medium circulation pipeline, wherein the heat medium circulation pipeline is configured to circulate a heat medium for heating liquefied gas, the heat and cold power generation device comprising: Rotor shaft; a generator including a motor rotor supported on an outer peripheral surface of the rotor shaft and a motor stator arranged to face the motor rotor; An inner shell housing the generator; an outer shell, arranged on the outer peripheral side of the inner shell, defining a heat medium flow path between the outer shell and the inner shell; a first-stage turbine device disposed in the heat medium flow path and disposed on the axial side of the rotor shaft relative to the generator; a second-stage turbine device disposed in the heat medium flow path and disposed on the other side of the generator in the axial direction of the rotor shaft; a journal bearing device arranged on the inner circumference side of the inner housing and closer to the other side than the generator; and A thrust bearing device is arranged on the inner peripheral side of the inner housing at the one side relative to the journal bearing device, The second-stage turbine device includes a second-stage stationary blade and a second-stage moving blade provided on the other side of the second-stage stationary blade. The rotor shaft includes a disk portion extending in the radial direction and supporting the second-stage moving blades of the second-stage turbine device. A radial gap connected to the heat medium flow path on the other side of the second-stage stationary blade is defined between the other end surface of the inner casing and the disk portion. The inner housing includes at least one pressure equalizing flow path that connects a first space located on the one side of the journal bearing device inside the inner housing and the radial gap.

2. The cold-heat power generation device according to claim 1, wherein: The thrust bearing device is arranged on the other side relative to the generator.

3. The cold-heat power generation device according to claim 2, wherein: The first space is defined on the other side of the thrust bearing device.

4. The cold-heat power generation device according to claim 3, wherein: The journal bearing arrangement comprises a main bearing and an auxiliary bearing.

5. The cold-heat power generation device according to any one of claims 1 to 4, wherein: The disk portion has at least one through hole penetrating in the axial direction of the rotor shaft.

6. The cold-heat power generation device according to any one of claims 1 to 4, wherein: The cold and heat power generation device further includes a sealing portion that seals between the rotor shaft and the inner casing at a position closer to the other side than the first-stage turbine device and closer to the one side than the generator.

7. The cold-heat power generation device according to claim 6, wherein: The cold and heat power generation device does not include a member for sealing between the rotor shaft and the inner case at the other side of the generator inside the inner case.

8. A cold-heat power generation system comprising the cold-heat power generation device according to any one of claims 1 to 4.

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