Temperature-adjustable turbine bearing box pillow block and forming method thereof

Abstract

The application discloses a temperature-adjustable steam turbine bearing box pillow block and a forming method thereof. The bearing box pillow block comprises a pillow block body; a cooling channel for flowing through a cooling medium is formed in the pillow block body along a supporting height direction; an inlet end of the cooling channel is in sealed connection with a cooling source outside the pillow block body for inputting the cooling medium; and an outlet end of the cooling channel is in sealed connection with a recycling structure outside the pillow block body for outputting the cooling medium. The application forms the cooling channel for flowing through and heat exchanging of the cooling medium in the pillow block body, absorbs heat of the cooling medium to reduce the temperature of the pillow block body, controls the pillow block body to be heated to a temperature within an allowable range under the action of heat radiation and high-temperature steam, avoids thermal expansion of the pillow block body, and ensures the stability of supporting of the steam cylinder.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, specifically to bearing housings that make up a steam turbine, and more specifically, to a temperature-adjustable steam turbine bearing housing pillow structure and a method for forming the pillow structure. Background Technology

[0002] A steam turbine is an external combustion rotary machine that converts the thermal energy of steam from a boiler into mechanical work. It consists of a cylinder and numerous components, including a rotor assembled inside the cylinder, various stages of moving blades, and corresponding steam seals. In the turbine's assembly structure, the rotor extends out of the cylinder via a shaft seal structure and is rotatably assembled with a corresponding bearing housing at the cylinder end.

[0003] The bearing housing of a steam turbine serves as a rotational support for the rotor. To eliminate the technical problem of inconsistent center changes between the cylinder and rotor under thermal expansion, which leads to changes in the clearance between the moving and stationary parts inside the cylinder, a bearing housing support—a support with a cat's claw structure—is fixedly connected to both sides of the bearing housing near the cylinder end. Examples include technologies disclosed in Chinese patent documents such as "50MW-class condensing gas turbine for high temperature and ultra-high pressure single reheat" (Publication No. CN 112343672 A, Publication Date February 9, 2021) and "A 250MW supercritical three-cylinder double extraction steam turbine" (Publication No. CN 203476405 U, Publication Date March 12, 2014).

[0004] In recent years, most steam turbine units have adopted a compact axial forming structure design to save on infrastructure costs, resulting in a relatively close distance between the axially arranged bearing housings and the cylinder ends. Based on the bearing housing support function described above, its distance to the cylinder ends is even closer. The bearing housing support is typically encased in the insulation layer of the cylinder's outer wall and is subject to heat radiation from the cylinder.

[0005] However, in this type of axially molded, compact steam turbine, with prolonged service life, steam leakage at the cylinder split surface and / or shaft seals caused by aging and wear will cause the leaking high-temperature steam to act on the already heat-radiated bearing housing supports within the insulation layer. Under the combined effect of the rotor-bearing housing assembly structure and the thermal expansion of the bearing housing supports on both sides, the bearing housing will undergo warping deformation, with the side supports lifting while the central bearing support remains essentially stationary. This deformation will inevitably cause the bearing housing supports to lift the cylinder's support arms, meaning the cylinder will be lifted due to the thermal expansion of the bearing housing supports, while the rotor inside the cylinder remains essentially at its original support height. This reduces the sealing clearance between the steam seal ring inside the cylinder and the corresponding structure on the bottom of the rotor, leading to accelerated wear of the steam seal ring. This, in turn, exacerbates the internal leakage of power steam at each stage within the cylinder, and may even lead to further external leakage through the shaft seal structure, adversely affecting the unit's operational stability and power efficiency.

[0006] Currently, there is no effective technical solution to this problem. To ensure stable operation of the unit and reduce power loss, it is necessary to optimize the design of the bearing housing support structure to address the issue of deformation and upward lifting due to thermal expansion. Summary of the Invention

[0007] The technical objective of this invention is to provide a turbine bearing housing pillow that can effectively suppress thermal expansion and deformation of the bearing housing pillow by means of temperature control, and a method for forming the pillow structure, in view of the special characteristics of the above-mentioned axially formed compact steam turbine and the technical shortcomings of the existing bearing housing pillow structure.

[0008] The technical objective of this invention is achieved through the following technical solution: a temperature-adjustable steam turbine bearing housing bolster, comprising a bolster body; The interior of the pillow body has a cooling channel formed along the support height direction for the flow of cooling medium. The inlet end of the cooling channel is sealed to the cooling source outside the pillow body, which supplies the cooling medium. The outlet end of the cooling channel is sealed to the outside of the pillow body and to the recovery structure for outputting the cooling medium.

[0009] The aforementioned technical measures address the specific characteristics of the compact axially shaped steam turbine. Based on the existing bearing housing support structure, a cooling channel is formed inside to allow the cooling medium to flow and exchange heat. During the flow of the external cooling medium, it absorbs heat and lowers the temperature, controlling its temperature rise outside the allowable range under the influence of thermal radiation and high-temperature steam. In other words, the cooling medium flowing within the cooling channel regulates and controls the temperature of the support body, preventing thermal expansion and ensuring the stability of the cylinder support. This also avoids adversely affecting the sealing clearance between the moving and stationary components within the cylinder.

[0010] As one of the preferred options, the cooling channels inside the pillow body are formed in a spiral coiled structure along the support height direction. This technical measure facilitates the cooling medium to fully and evenly absorb heat within the pillow body, resulting in relatively balanced temperature control of the pillow body. This reduces or even avoids thermal stress concentration caused by uneven heat absorption and cooling, while also effectively preventing the cooling channel's forming structure from adversely affecting the structural strength and rigidity of the pillow body.

[0011] Furthermore, the cooling channels inside the pillow body are formed by a rectangular spiral trajectory in the support height direction; The cooling channel formed by the coiled rectangular spiral trajectory has multiple sets of U-shaped channels arranged at different height positions in the support height direction of the pillow body; The two adjacent sets of U-shaped channels at the upper and lower positions are connected sequentially by oblique connecting channels.

[0012] The above-mentioned technical measures, based on the principle of facilitating relatively balanced cooling control of the pillow body by the cooling medium, and by forming the cooling channel in a rectangular spiral trajectory, facilitate the formation of the internal spiral cooling channel in the pillow body through machining, thereby reducing the technical difficulty of forming the pillow body.

[0013] Furthermore, the inlet and outlet ends of the cooling channel are formed on the same side surface of the bearing housing body. This technical measure addresses the mating structure between the bearing housing bearing housing and the cylinder and bearing housing body, forming a single-sided external cooling medium delivery structure, thereby contributing to the overall compactness of the formed structure and reducing mutual interference.

[0014] As one of the preferred embodiments, the cooling channel serves as the inlet end at the bottom side of the pillow body in the height direction, and is used for a sealed connection with the cooling source. Correspondingly, the cooling channel serves as the outlet end at the top side end of the pillow body in the height direction, and is used for a sealed connection with the recycling structure. The cooling medium flows and absorbs heat from the bottom to the top side in the direction of the support height within the pillow body.

[0015] The above-mentioned technical measures address the unique characteristic of the pillow seat body during service, where the upper part is heated at a higher temperature than the lower part. They create a cooling medium that flows from bottom to top, achieving sufficient heat absorption and cooling while maintaining the characteristic that the upper part of the pillow seat body remains heated at a higher temperature than the lower part after heat absorption. This adapts to the heating environment, reduces thermal stress concentration caused by excessive differences between heat absorption cooling and heating, and ensures the stress performance of the pillow seat body.

[0016] Furthermore, the pillow seat body is connected to the turbine's circulating water cooling system through the cooling channel, using the circulating water in the system as the cooling medium. This technical measure is based on the turbine's circulating water cooling system, utilizing locally available materials and facilitating the circulation of the cooling medium. While ensuring cooling effectiveness, it also contributes to a simpler and more compact cooling structure for the pillow seat body, eliminating the need for a separate large heat exchanger capable of achieving sufficient cooling. Simultaneously, the circulating water in the cooling system has a high specific heat capacity, resulting in excellent heat absorption and cooling effect on the pillow seat body.

[0017] Furthermore, a regulating valve is connected to the water inlet pipe at the inlet end of the cooling channel; The regulating valve is used to throttle and control the flow rate of circulating water entering the cooling channel.

[0018] The above-mentioned technical measures can regulate the flow rate of the cooling medium entering the pillow block body by adjusting the throttling control characteristics of the regulating valve, thereby facilitating the regulation and control of the heat exchange temperature of the pillow block body and achieving relatively constant temperature control. For example, the opening of the regulating valve can be controlled according to the monitored changes in the heating temperature of the pillow block body, so that the pillow block body is always within a relatively constant range (for example, based on the heating temperature of the bearing housing of 55°C). This avoids expansion and deformation due to different heating between the pillow block body and the bearing housing body, which is conducive to maintaining stable operation of the unit.

[0019] A method for molding the above-mentioned adjustable temperature turbine bearing housing pillow seat, the molding method comprising the following process steps: Step 1. According to the design structure of the turbine bearing housing bolster, the bolster body is formed by casting; Step 2. According to the design pitch of the cooling channel in the support height direction of the pillow body, multiple sets of U-shaped channels are formed at different height positions of the pillow body by drilling through holes at both ends; Step 3. Connect the two adjacent sets of U-shaped channels at the upper and lower positions with an oblique connecting channel; Step 4. Clean all the channels thoroughly; Step 5. Leave the corresponding ends of the channels that form the inlet and outlet of the cooling channel. Seal the other cleaned channel ends with plugs. The plugs should extend inward to the outer wall of the transition between the intersecting channels.

[0020] The forming method of the above-mentioned technical measures is designed for the special characteristics of the cooling channel with the rectangular spiral trajectory. It is easy to machine and reduces the technical difficulty of spiral forming the cooling channel in the pillow body. It is simple and easy to implement.

[0021] As one of the preferred options, in step 2, the design pitch of the cooling channel on the pillow body is 2 to 5 times the diameter of the channel.

[0022] As one of the preferred options, in steps 2 and 3, the distance between the outer wall of each channel and the adjacent outer wall of the pillow body is 1.5 to 3 times the diameter of the channel.

[0023] The above-mentioned technical measures, while facilitating the full and uniform heat absorption and cooling of the cooling medium in the cooling channel, effectively avoid the adverse effects of the cooling channel's molding structure on the structural strength and rigidity of the pillow seat body. In other words, the cooling channel is formed while ensuring the structural strength of the pillow seat body.

[0024] The beneficial technical effects of the present invention are as follows: The above-mentioned technical measures are designed for the special characteristics of the steam turbine with a relatively compact axial forming structure. Based on the existing bearing housing pillow structure, a cooling channel is formed inside it for the cooling medium to flow through and exchange heat. This channel is then incorporated into the circulating water cooling system of the steam turbine. The circulating water absorbs heat and cools the steam turbine, controlling its temperature rise outside the allowable range under the action of thermal radiation and high-temperature steam, preventing it from expanding due to heat, ensuring the stability of the cylinder support, and not adversely affecting the sealing clearance between the moving and stationary parts inside the cylinder. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of one structure of the present invention.

[0026] Figure 2 for Figure 1 A perspective view of the pillow base.

[0027] Figure 3 This is a reference diagram showing one usage state of the present invention.

[0028] The symbols in the diagram mean: 1—pillow seat body; 11—cooling channel; 111—longitudinal channel; 112—first transverse channel; 113—second transverse channel; 114—oblique connecting channel; 2—water inlet pipe; 21—regulating valve; 3—water outlet pipe; 4—bearing housing body; 5—bearing assembly; 6—cylinder; 7—rotor. Detailed Implementation

[0029] This invention relates to the field of steam turbine technology, specifically to bearing housings that make up a steam turbine, and more specifically, to a temperature-adjustable steam turbine bearing housing support structure and a method for forming the support structure. The main technical solution of this invention will be described in detail below with reference to several embodiments. Embodiment 1 is illustrated in conjunction with the accompanying drawings—that is… Figure 1 , Figure 2 and Figure 3 The technical solution of the present invention is clearly and in detail explained; although other embodiments are not shown in separate drawings, their main structure can still be referred to the drawings of Embodiment 1.

[0030] It should be noted that the accompanying drawings of this invention are schematic, and unnecessary details have been simplified to clarify the technical objectives of this invention, so as to avoid obscuring the technical solutions contributed by this invention to the prior art. Furthermore, the terms "approximately" or "basically" used below to refer to quantities or fit relationships mean that reasonable assembly and processing errors are allowed in the industry, and do not literally describe absolute quantities or fit relationships.

[0031] Example 1 See Figure 1 and Figure 2As shown, the turbine bearing housing pillow of the present invention includes a pillow body 1. Inside the pillow body 1, a cooling channel 11 with a rectangular spiral trajectory winding structure is formed along the support height direction. The cooling channel 11 serves as a cooling medium to flow through, so as to exchange and cool the heat received by the pillow body 1 during service.

[0032] Specifically, the cooling channel 11, formed by a rectangular spiral trajectory, has multiple sets of U-shaped channels arranged at approximately equal intervals at different heights along the support height direction of the pillow body 1. Each set of U-shaped channels consists of a U-shaped fold structure formed by sequentially connected longitudinal channels 111, a first transverse channel 112, and a second transverse channel 113. The spacing between two adjacent sets of U-shaped channels—that is, the designed pitch—is approximately three times the channel diameter.

[0033] Between the two adjacent sets of U-shaped channels, the first transverse channel 112 of the lower U-shaped channel is sequentially connected to the second transverse channel 113 of the upper U-shaped channel via an oblique connecting channel 114. That is, the oblique connecting channel 114 is a spiral transition channel, and the forming position of the oblique connecting channel 114 within the pillow body 1 is far from the longitudinal channel 111. In the top or bottom view direction, the longitudinal channel 111, the first transverse channel 112, the oblique connecting channel 114, and the second transverse channel 113 form a rectangular outline.

[0034] In the aforementioned rectangular spiral winding structure of the cooling channel 11, the bottom end of the cooling channel 11 in the support height direction of the pillow body 1 is used as the inlet end, that is, the outer end of the longitudinal channel 111 of the bottommost U-shaped channel is used as the inlet end. Due to the transition between the bottommost channel and the adjacent upper U-shaped channel, the bottommost channel does not form a U-shaped trajectory, but rather an L-shaped trajectory. The top end of the cooling channel 11 in the support height direction of the pillow body 1 is used as the outlet end, that is, the outer end of the longitudinal channel 111 of the topmost U-shaped channel is used as the inlet end. Due to the transition between the topmost channel and the adjacent lower U-shaped channel, the topmost channel does not form a U-shaped trajectory, but rather an L-shaped trajectory. Thus, the inlet end and outlet end of the cooling channel 11 are formed on the same side surface of the pillow body 1.

[0035] The longitudinal and transverse descriptions of the above-mentioned channels are based on the initial direction of the cooling medium entering the pillow body. The direction along the entry direction is the longitudinal direction, and the direction that intersects the longitudinal direction perpendicularly or substantially perpendicularly is the transverse direction.

[0036] To avoid positional interference with the bearing housing body and cylinder, the pillow body 1 serves as the side of the inlet and outlet of the molding cooling channel 11, located on the side of the pillow body 1 away from the bearing assembly on the bearing housing.

[0037] The straight-line distance between the outer wall of each of the above-mentioned channels—namely, the longitudinal channel 111, the first transverse channel 112, the oblique connecting channel 114, or the second transverse channel 113—and the adjacent outer wall of the pillow body is approximately twice the diameter of the channel.

[0038] The aforementioned pillow body 1 is connected to the turbine's circulating water cooling system via a cooling channel 11. Specifically, the inlet pipe 2, sealed at the inlet end of the cooling channel 11, and the outlet pipe 3, sealed at the outlet end of the cooling channel 11, are connected to the turbine's circulating water cooling system, using the circulating water in the system as the cooling medium for the pillow body 1. The circulating water cooling system serves as both a cooling source and a heat recovery structure. The circulating water, acting as the cooling medium, enters the cooling channel 11 within the pillow body 1 via the inlet pipe 2, flowing from the bottom to the top of the support height direction to absorb heat, and is then discharged from the outlet pipe 3 back into the circulating water cooling system for recycling.

[0039] In order to control the flow rate of circulating water entering the cooling channel 11 of the pillow body 1 and adjust the heat absorption temperature, a regulating valve 21 is connected to the water inlet pipe 2 connected to the inlet end of the cooling channel 11. The regulating valve 21 is used to throttle and control the flow rate of circulating water entering the cooling channel 11.

[0040] The above-mentioned method for forming the turbine bearing housing pillow includes the following process steps: Step 1. According to the design structure of the turbine bearing housing pillow seat, the pillow seat body 1 is formed by casting; Step 2. According to the design pitch of the cooling channel in the support height direction of the pillow body 1, multiple sets of U-shaped channels are formed at different height positions of the pillow body 1 by drilling through holes at both ends; Step 3. Connect the ends of the upper second transverse channel 113 and the lower first transverse channel 112 of the two adjacent sets of U-shaped channels away from the longitudinal channel 111 with an oblique connecting channel 114. Thus, a rectangular spiral trajectory winding structure is formed inside the pillow body 1; Step 4. Clean all the channels thoroughly; Step 5. Leave the corresponding ends of the cooling channel inlet and outlet. Seal the other cleaned ends of the channel with plugs. The inward extension length of the plug at the corresponding end of the channel is basically flush with the transition outer wall of the intersecting channel, so as not to obstruct the connection structure of the channel. Thus, a cooling channel 11 with a rectangular spiral trajectory is formed inside the pillow body 1.

[0041] See Figure 3As shown, in the turbine assembly structure, two sets of pillow block bodies 1 are fixed on both sides of the bearing assembly 5 of the bearing housing body 4, the rotor 7 is supported on the bearing assembly 5 of the bearing housing body 4, and the cylinder 6 is supported on the two sets of pillow block bodies 1 by cat claws. The turbine's circulating water cooling system can be connected to both ends of the cooling channel 11 of the pillow block body 1.

[0042] Example 2 The turbine bearing housing bolster of the present invention includes a bolster body. Inside the bolster body, a cooling channel with an annular spiral trajectory is formed along the support height direction. This cooling channel serves as a cooling medium for flowing through, so as to exchange and cool the heat received by the bolster body during service.

[0043] Specifically, the cooling channel, formed by a spiral winding structure, has a pitch approximately five times the diameter of the channel. In the aforementioned spiral winding cooling channel, the bottom end of the cooling channel in the direction of the support height of the pillow body serves as the inlet end; the top end of the cooling channel in the direction of the support height of the pillow body serves as the outlet end, and the inlet and outlet ends of the cooling channel are formed on the same side surface of the pillow body.

[0044] To avoid positional interference with the bearing housing body and cylinder, the side of the pillow block body, which serves as the inlet and outlet of the forming cooling channel, is located on the side of the pillow block body away from the bearing assembly on the bearing housing.

[0045] The minimum straight-line distance between the outer wall of the cooling channel and the adjacent outer wall of the pillow body is approximately 1.5 times the diameter of the channel.

[0046] The aforementioned sleeper seat body is connected to the turbine's circulating water cooling system via a cooling channel. Specifically, the inlet pipe sealed at the inlet end of the cooling channel and the outlet pipe sealed at the outlet end are connected to the turbine's circulating water cooling system, using the circulating water in the system as the cooling medium. The circulating water cooling system serves as both a cooling source and a heat recovery mechanism. The circulating water enters the cooling channel within the sleeper seat body through the inlet pipe, absorbing heat as it flows from the bottom to the top along the support height direction, and is then discharged through the outlet pipe back into the circulating water cooling system for heat recovery.

[0047] In order to control the flow rate of circulating water entering the cooling channel of the pillow body and adjust the heat absorption temperature, a regulating valve is connected to the water inlet pipe connected to the inlet end of the cooling channel. The regulating valve is used to throttle and control the flow rate of circulating water entering the cooling channel.

[0048] The aforementioned turbine bearing housing pillow is directly formed using investment casting.

[0049] Example 3 The turbine bearing housing bolster of the present invention includes a bolster body. Inside the bolster body, a cooling channel with a rectangular spiral trajectory is formed along the support height direction. This cooling channel serves as a cooling medium for flowing through, so as to exchange and cool the heat received by the bolster body during service.

[0050] Specifically, the cooling channel, formed by a rectangular spiral trajectory, has multiple sets of U-shaped channels arranged at approximately equal intervals at different heights along the support height direction of the pillow body. Each set of U-shaped channels consists of a U-shaped fold structure formed by sequentially connected longitudinal channel one, transverse connecting channel, and longitudinal channel two. The spacing between two adjacent sets of U-shaped channels at the upper and lower positions—that is, the design pitch—is approximately twice the channel diameter.

[0051] Between the two adjacent sets of U-shaped channels, the longitudinal channel 2 of the lower U-shaped channel is connected to the longitudinal channel 1 of the upper U-shaped channel through an oblique connecting channel. That is, the oblique connecting channel is a spiral transition channel. The forming position of the oblique connecting channel in the pillow body is far away from the transverse connecting channel. In the top or bottom view, the longitudinal channel 1, the transverse connecting channel, the longitudinal channel 2 and the oblique connecting channel form a rectangular outline.

[0052] The longitudinal and transverse descriptions of the above-mentioned channels are based on the initial direction of the cooling medium entering the pillow body. The direction along the entry direction is the longitudinal direction, and the direction that intersects the longitudinal direction perpendicularly or substantially perpendicularly is the transverse direction.

[0053] In the aforementioned rectangular spiral winding structure of the cooling channel, the bottom end of the cooling channel in the direction of the support height of the pillow body is used as the inlet end, that is, the outer end of the longitudinal channel one of the bottommost U-shaped channel is used as the inlet end. The top end of the cooling channel in the direction of the support height of the pillow body is used as the outlet end, that is, the outer end of the longitudinal channel two of the topmost U-shaped channel is used as the inlet end, so that the inlet end and outlet end of the cooling channel are formed on the same side surface of the pillow body.

[0054] To avoid positional interference with the bearing housing body and cylinder, the side of the pillow block body, which serves as the inlet and outlet of the forming cooling channel, is located on the side of the pillow block body away from the bearing assembly on the bearing housing.

[0055] The straight-line distance between the outer wall of each of the above-mentioned channels—namely, longitudinal channel one, transverse connecting channel, longitudinal channel two, or oblique connecting channel—and the adjacent outer wall of the pillow body is approximately three times the diameter of the channel.

[0056] The pillow body of the above structure is connected to a separate cooling device, such as a cooling oil tank, via a pipe sealed at the inlet end of the cooling channel, using cooling oil as the cooling medium. The cooling oil is discharged into the cooling oil tank for recycling via a pipe sealed at the outlet end of the cooling channel.

[0057] In order to control the flow rate of cooling oil entering the cooling channel of the pillow body and adjust the heat absorption temperature, a regulating valve is connected to the pipe connected to the inlet end of the cooling channel. The regulating valve is used to throttle and control the flow rate of cooling oil entering the cooling channel.

[0058] Of course, the regulating valve can also be installed at the outlet of the cooling oil tank.

[0059] The above-mentioned method for forming the turbine bearing housing pillow includes the following process steps: Step 1. According to the design structure of the turbine bearing housing bolster, the bolster body is formed by casting; Step 2. According to the design pitch of the cooling channel in the support height direction of the pillow body, multiple sets of U-shaped channels are formed at different height positions of the pillow body by drilling through holes at both ends; Step 3. Connect the ends of the upper longitudinal channel one and the lower longitudinal channel two of the two adjacent sets of U-shaped channels that are away from the transverse connecting channel with an oblique connecting channel. In this way, a rectangular spiral track structure is formed inside the pillow body. Step 4. Clean all the channels thoroughly; Step 5. Leave the corresponding ends of the cooling channel inlet and outlet. Seal the other cleaned ends of the channel with plugs. The inward extension length of the plug at the corresponding end of the channel is basically flush with the transition outer wall of the intersecting channel, so as not to obstruct the connection structure of the channel. In this way, a cooling channel with a rectangular spiral trajectory is formed inside the pillow body.

[0060] In the turbine assembly structure, two sets of pillow block bodies are fixed on both sides of the bearing assembly on the bearing housing to support the cylinder. A separate cooling oil tank is then connected to both ends of the cooling channel of the pillow block body through a sealed pipe.

[0061] The above embodiments are only used to illustrate the present invention and are not intended to limit it.

[0062] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications can still be made to the above embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the present invention.

Claims

1. A temperature-adjustable steam turbine bearing housing bolster, comprising a bolster body (1); Its features are: The interior of the pillow body (1) is formed with a cooling channel (11) along the support height direction for the flow of cooling medium. The cooling channel (11) is located at the bottom end of the pillow body (1) in the support height direction as the inlet end. The inlet end of the cooling channel (11) is sealed to the cooling source outside the pillow body (1) for the input of cooling medium. The cooling channel (11) is located at the top end of the pillow body (1) in the support height direction as the outlet end. The outlet end of the cooling channel (11) is sealed to the recovery structure outside the pillow body (1) for the output of cooling medium. The cooling medium flows from the bottom to the top in the support height direction within the pillow body (1) to absorb heat, so that the upper part of the pillow body (1) after absorbing heat is kept at a higher temperature than the lower part. The cooling channel (11) inside the pillow body (1) is formed by a rectangular spiral trajectory in the support height direction; The cooling channel (11) formed by the coiling of the rectangular spiral trajectory has multiple sets of U-shaped channels arranged at different height positions in the support height direction of the pillow body (1). The two adjacent sets of U-shaped channels in the upper and lower positions are connected sequentially by oblique connecting channels (114).

2. The adjustable temperature turbine bearing housing support according to claim 1, characterized in that: The inlet and outlet ends of the cooling channel (11) are formed on the same side surface of the pillow body (1).

3. The adjustable temperature turbine bearing housing support according to claim 1, characterized in that: The pillow body (1) is connected to the turbine's circulating water cooling system through the cooling channel (11), using the circulating water in the circulating water cooling system as the cooling medium.

4. The adjustable temperature turbine bearing housing support according to claim 3, characterized in that: A regulating valve (21) is connected to the water inlet pipe (2) connected to the inlet end of the cooling channel (11). The regulating valve (21) is used to throttle the flow rate of circulating water entering the cooling channel (11).

5. A method of forming a temperature-adjustable bearing box pillow block for a turbine shaft as defined in claim 1, wherein, The molding method includes the following process steps: Step 1. According to the design structure of the turbine bearing housing bolster, the bolster body is formed by casting; Step 2. According to the design pitch of the cooling channel in the support height direction of the pillow body, multiple sets of U-shaped channels are formed at different height positions of the pillow body by drilling through holes at both ends; Step 3. Connect the two adjacent sets of U-shaped channels at the upper and lower positions with an oblique connecting channel; Step 4. Clean all the channels thoroughly; Step 5. Leave the corresponding ends of the channels that form the inlet and outlet of the cooling channel. Seal the other cleaned channel ends with plugs. The plugs should extend inward to the outer wall of the transition between the intersecting channels.

6. The method for forming the adjustable temperature turbine bearing housing pillow seat according to claim 5, characterized in that: In step 2, the design pitch of the cooling channel on the pillow body is 2 to 5 times the diameter of the channel.

7. The method for forming the adjustable temperature turbine bearing housing pillow seat according to claim 5, characterized in that: In steps 2 and 3, the distance between the outer wall of each channel and the adjacent outer wall of the pillow body is 1.5 to 3 times the diameter of the channel.

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