An air-cooled crosshead motor

Abstract

This invention discloses an air-cooled crosshead motor, relating to the field of motors. It includes an assembly plate disposed between a first motor and a second motor. The first motor and the second motor each include a first housing and a second housing, which are sequentially connected. Air passages are formed within both the first and second housings. A high-temperature zone is formed at the contact points between the first and second housings and the assembly plate. A groove is formed on the assembly plate corresponding to the high-temperature zone, and the inner wall of the groove forms an air guide channel with the corresponding outer surface of the first and second housings. The air passages are connected to their respective air guide channels. A cavity is formed inside the assembly plate, and two partition plates form a heat insulation cavity and two air guide chambers within this cavity. The heat insulation cavity is located between the two air guide chambers, and the two air guide chambers are connected to the corresponding air guide channels of the first and second housings, respectively. This invention solves the problem of heat accumulation easily forming at the junction of two superimposed motors.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more particularly to an air-cooled crosshead motor. Background Technology

[0002] A crosshead motor typically consists of two motors stacked vertically along the same axis to form a single unit. The two motors are fixed and connected by a connecting member in the middle, resulting in a compact, integrated arrangement. This structure can achieve high power output within a limited installation space and facilitates dual-sided drive or load sharing, making it suitable for equipment requiring both compactness and high output performance.

[0003] Existing air-cooled crosshead motors typically employ a stacked structure of two motors, fixedly connected by a mounting plate between them to ensure overall structural compactness and transmission stability. In this type of structure, air channels are generally provided within the motor housing to cool the internal heat-generating components. However, in practical applications, heat accumulation easily occurs at the stacked area of ​​the two motors. Specifically, the mounting plate between the two motors is often a solid structure. While serving as a mechanical connector bearing structural loads, it inevitably forms a heat conduction path, causing heat to accumulate between the two motors near the mounting plate. Simultaneously, the tight contact between the solid mounting plate and the motor housing hinders effective airflow in this area, preventing heat dissipation and leading to significant heat accumulation at the connection point. This negatively impacts the overall heat dissipation of the motor and may even cause excessively high local temperatures, reducing the motor's operational reliability and lifespan.

[0004] Therefore, an air-cooled crosshead motor is proposed to solve the problem of heat accumulation at the junction of two motors. Summary of the Invention

[0005] The purpose of this invention is to provide an air-cooled crosshead motor that solves the problem of heat buildup at the point where two motors are stacked.

[0006] To achieve this objective, the present invention adopts the following technical solution: An air-cooled crosshead motor includes an assembly plate disposed between a first motor and a second motor. The first motor and the second motor each include a first housing and a second housing. The first housing, the assembly plate and the second housing are connected in sequence. Air passages are provided in both the first housing and the second housing. A high-temperature zone is formed at the contact area between the first housing, the second housing and the assembly plate. A groove is formed on the assembly plate corresponding to the high-temperature zone. The inner wall of the groove and the outer surface of the first housing and the second housing respectively form an air guide channel. The air channel is connected to the corresponding air guide channel. The assembly plate has a cavity inside, and the cavity is formed by two partition plates to form a heat insulation cavity and two air guide cavities. The heat insulation cavity is located between the two air guide cavities, and the two air guide cavities are respectively connected to the air guide ducts corresponding to the first shell and the second shell. One of the air passages is connected to the air intake pipe, the air intake pipe passes through the assembly plate, and the air intake pipe is connected to the air guide cavity. The connection between the air guide cavity and the air intake pipe is located upstream of the connection between the air passage and the air intake pipe inside the first housing. The air intake pipe, air guide cavity, air guide duct, and air duct are connected in sequence.

[0007] The air passage is connected to the air duct through an inlet hole. The inlet hole is set at an angle, and the angle between the axis of the inlet hole and the extension direction of the air passage is less than 90 degrees.

[0008] The connection point between the inlet hole and the airway is the inlet section of the airway.

[0009] The assembly plate has perforations, and the air guide cavity is connected to the air guide duct through the perforations.

[0010] The number of perforations is several, and the several perforations are distributed along the extension direction of the air duct, and the diameter of the several perforations increases sequentially along the air flow direction.

[0011] The air intake pipe has a first air hole corresponding to the air guide cavity, and the assembly plate has a second air hole communicating with the air guide cavity. The air intake pipe is connected to the air guide cavity through the first air hole and the second air hole.

[0012] The heat insulation cavity is a closed cavity, and the interior of the heat insulation cavity is filled with a gas with low thermal conductivity.

[0013] Both ends of the first housing are provided with first end caps. The air passage on the first housing is an S-shaped channel, which includes several long straight sections and arc-shaped sections. The long straight sections are arranged inside the first housing along the axial direction of the first housing, and the arc-shaped sections are arranged on the end face of the first housing. An air inlet is provided on the first housing, and the air inlet is connected to the long straight sections. A first air outlet is provided on the first end cap at the position corresponding to the air outlet end of the S-shaped channel. The first air outlet is used to discharge air from the S-shaped channel.

[0014] The second housing has a second end cap at both ends. The air passage on the second housing includes several long straight channels connected in series through a connecting hole. The long straight channels are distributed along the axis of the second housing. The air inlet pipe is connected to one of the long straight channels. The connecting hole is opened on the side of the second end cap near the second housing. The connecting hole located at the air outlet end of the air passage on the second housing penetrates the second end cap and is used to discharge the air input by the air inlet pipe.

[0015] Both the first air outlet and the connecting hole located at the air outlet end of the air passage on the second housing are equipped with silencers.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides an air-cooled crosshead motor. An assembly plate is placed between the first and second motors of the crosshead motor. Grooves are formed on the assembly plate corresponding to the high-temperature areas formed by the contact points between the first and second housings and the assembly plate. The inner walls of the grooves form air ducts with the corresponding outer surfaces of the first and second housings. Simultaneously, air ducts within the first and second housings are connected to their respective air ducts. Furthermore, a cavity is formed inside the assembly plate, and two partition plates create a heat insulation cavity and two air ducts. The heat insulation cavity is located between the two air ducts, which are themselves connected to their respective air ducts. An air intake pipe passes through the assembly plate, connecting to one of the air ducts and to the air ducts. The connection between the air ducts and the air intake pipe is also connected... The air passage is located upstream of the connection between the air passage and the intake pipe, thus creating an airflow path in which the intake pipe, air guide cavity, air guide duct and air passage are connected in sequence. This allows the cooling air to flow through the air guide duct to preferentially cool the high-temperature area before entering the air passage for overall heat dissipation. This achieves localized enhanced cooling of the high-temperature area without changing the air passage's dominant heat dissipation function. At the same time, the heat insulation cavity located between the two air guide cavities blocks the heat conduction path between the first and second housings through the assembly plate, effectively reducing the degree of heat superposition between the two motors in the connection area. This improves the problem of uneven local temperature distribution caused by poor air circulation near the assembly plate, ultimately alleviating the phenomenon of heat accumulation at the superposition of the two motors and thus improving the motor's operational reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the disassembled structure of the first shell and the second shell in this invention; Figure 3 This is a schematic diagram of the internal structure of the S-shaped channel in this invention; Figure 4 This is a schematic diagram of the disassembled structure of the second shell and the second end cap in this invention; Figure 5 This is a schematic diagram of the disassembled structure of the second housing and the assembly plate in this invention; Figure 6 This is a bottom view of the assembly plate in this invention. Figure 7 This is a top view of the assembly plate in this invention. Figure 8 This is a schematic diagram of the internal structure of the cavity in this invention.

[0020] Illustrations: 1. First motor; 11. First housing; 111. Air inlet; 12. First end cap; 121. First air outlet; 13. S-shaped channel; 131. Long straight section; 132. Arc-shaped section; 2. Second motor; 21. Second housing; 211. Long straight channel; 22. Second end cap; 221. Connecting hole; 23. Air inlet pipe; 24. First air hole; 3. Assembly plate; 31. Groove; 311. Air duct; 32. Cavity; 321. Air duct cavity; 322. Heat insulation cavity; 323. Partition plate; 33. Second air hole; 34. Perforation; 4. Air passage; 5. High temperature zone; 6. Inlet hole; 7. Silencer. Detailed Implementation

[0021] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0023] Example 1: Please see Figures 1 to 8 An air-cooled crosshead motor in this embodiment includes an assembly plate 3 disposed between a first motor 1 and a second motor 2. The first motor 1 and the second motor 2 respectively include a first housing 11 and a second housing 21. The first housing 11, the assembly plate 3 and the second housing 21 are connected in sequence. Air passages 4 are provided in both the first housing 11 and the second housing 21. A high-temperature zone 5 is formed at the contact area between the first housing 11, the second housing 21 and the assembly plate 3. A groove 31 is provided on the assembly plate 3 corresponding to the high-temperature zone 5. The inner wall of the groove 31 and the outer surface of the first housing 11 and the second housing 21 respectively form an air guide duct 311. The air passage 4 is connected to the corresponding air guide duct 311. The assembly plate 3 has a cavity 32 inside, and the cavity 32 is formed by two partition plates 323 to form a heat insulation cavity 322 and two air guide cavities 321. The heat insulation cavity 322 is located between the two air guide cavities 321, and the two air guide cavities 321 are respectively connected to the air guide ducts 311 corresponding to the first housing 11 and the second housing 21. One of the air passages 4 is connected to the air inlet pipe 23, the air inlet pipe 23 passes through the assembly plate 3, and the air inlet pipe 23 is connected to the air guide cavity 321. The connection between the air guide cavity 321 and the air inlet pipe 23 is located upstream of the connection between the air passage 4 and the air inlet pipe 23 inside the first housing 11. The air intake pipe 23, the air guide cavity 321, the air guide duct 311 and the air duct 4 are connected in sequence.

[0024] It should be noted that air duct 4 is the main heat dissipation channel for the motor. Air flows within air duct 4 and undergoes convective heat exchange with the inner wall of the casing, thereby carrying away the heat generated during motor operation. Since the first motor 1 and the second motor 2 are connected by mounting plate 3, and their sides closest to mounting plate 3 are adjacent to each other, heat tends to concentrate in this area during operation, forming a high-temperature zone. Air guide duct 311 is arranged at the corresponding position of high-temperature zone 5, allowing air to flow in the area close to high-temperature zone 5, thus providing preferential cooling to this area. At the same time, since air guide duct 311 is connected to air duct 4, some of the air in air guide duct 311 is supplied to air duct 4, and some is discharged from air guide duct 311.

[0025] During operation, external air enters the intake pipe 23 and forms two flow paths. One part of the air directly enters the air passage 4 and flows along the air passage 4 to dissipate heat from the inside of the motor. The other part of the air enters the air guide cavity 321 and then enters the air guide duct 311. It flows along the high-temperature zone 5 in the air guide duct 311 to cool the area locally. Then, it enters the air passage 4 through the connection structure between the air guide duct 311 and the air passage 4 and continues to participate in the heat dissipation process in the air passage 4.

[0026] Through the above structural design, the high-temperature zone 5 is preferentially cooled by air before entering the air duct 4, while ensuring that the main heat dissipation is still completed by the air duct 4, thus achieving a combination of localized enhanced cooling and overall heat dissipation. In addition, the heat insulation cavity 322 is located between the two air guide cavities 321, which can reduce heat conduction between the first motor 1 and the second motor 2 through the mounting plate 3, thereby reducing the heat superposition of the two motors in the connection area.

[0027] It is understandable that the air guide cavity 321, air guide duct 311, and air duct 4 form a continuous airflow path through the aforementioned connection method. This allows air to flow along the air guide duct 311 through the high-temperature zone 5 before entering the air duct 4, where it undergoes partial heat exchange before entering the air duct 4 to participate in the subsequent heat dissipation process. By setting the connection point between the air guide cavity 321 and the air inlet pipe 23 upstream of the air inlet position of the air duct 4, the air is guided to flow near the high-temperature zone 5 before entering the air duct 4, allowing the high-temperature zone 5 to be preferentially cooled before the air duct 4 dissipates heat. Subsequently, the air enters the interior of the air duct 4 and continues to flow along a predetermined path, thus forming an airflow organization method of first local cooling and then overall heat dissipation. If the above structure is simply set outside the air duct 4 or arranged parallel to the air duct 4, the air will have difficulty effectively acting on the high-temperature zone 5 before entering the air duct 4, or it may form an independent flow path and fail to continuously coordinate with the airflow inside the air duct 4, making it difficult to simultaneously achieve both enhanced local cooling and overall heat dissipation effects.

[0028] In the airflow path, the airflow within the air duct 4 constitutes the main heat dissipation path, undertaking the overall heat dissipation function of the motor; the airflow path formed by the air guide cavity 321 and the air guide duct 311 is used for local cooling of the high-temperature zone 5, and this part of the air, after completing local heat exchange, is still replenished into the air duct 4 to participate in overall heat dissipation. Therefore, the air guide structure does not form an independent heat dissipation circuit, but rather provides auxiliary cooling to the high-temperature zone 5 without changing the dominant heat dissipation function of the air duct 4, thereby improving the local temperature rise distribution.

[0029] In a specific embodiment, such as Figure 8 As shown, the air intake pipe 23 has a first air hole 24 corresponding to the air guide cavity 321, and the mounting plate 3 has a second air hole 33 communicating with the air guide cavity 321. The air intake pipe 23 is connected to the air guide cavity 321 through the first air hole 24 and the second air hole 33.

[0030] Furthermore, the heat insulation cavity 322 is a closed cavity, and the interior of the heat insulation cavity 322 is filled with a low thermal conductivity gas; preferably, the low thermal conductivity gas is argon.

[0031] It should be noted that when the cooling air in the intake pipe 23 flows through the assembly plate 3, part of the airflow is introduced into the air guide cavity 321 through the first air hole 24 and the second air hole 33. Since the first air hole 24 and the second air hole 33 are arranged correspondingly in the radial direction of the intake pipe 23, the airflow can be diverted to the two air guide cavities 321 by utilizing the static pressure of the airflow itself without increasing the flow resistance of the intake pipe 23. At the same time, the heat insulation cavity 322 located between the two air guide cavities 321 is filled with a low thermal conductivity gas such as argon. Since the thermal conductivity of the low thermal conductivity gas is much lower than that of the metal assembly plate 3 body, this structure can effectively block the heat conduction path between the first shell 11 and the second shell 21 through the assembly plate 3.

[0032] Through the radial connection between the first vent 24 and the second vent 33, natural airflow distribution can be achieved within the assembly plate 3 without the need for additional bypass pipes or diversion valves. This structure enables a stable supply of cooling air to the air duct 311 of the high-temperature zone 5 while maintaining the intake flow of the main air duct 4, thereby achieving heat intervention in the connection area between the first motor 1 and the second motor 2 without increasing system complexity.

[0033] Furthermore, the inclusion of the heat insulation cavity 322 further enhances the suppression of heat accumulation. If the assembly plate 3 only dissipates heat through airflow channels while the main body remains a solid metal structure, the heat generated by the first motor 1 and the second motor 2 will still be transferred between each other through the solid portion of the assembly plate 3, easily leading to temperature superposition during prolonged operation. The aforementioned structure, by constructing a sealed heat insulation cavity 322 with a low thermal conductivity gas layer inside the assembly plate 3, effectively inserts a high thermal resistance layer into the heat conduction path, significantly reducing the conductive heat flow between the first housing 11 and the second housing 21 and minimizing the risk of heat accumulation.

[0034] Example 2: The basic content is the same as in Example 1, except that: While the scheme in Example 1 can guide cooling air to the high-temperature zone 5 at the assembly plate 3 for localized cooling, in the actual airflow organization process, if the airflow in the air guide duct 311 directly merges into the main air duct 4 in a direction perpendicular to it, local vortex zones and flow separation are easily generated at the interface where the two airflows meet. This phenomenon not only increases the local flow resistance of the airflow, leading to increased back pressure and limited flow in the air guide duct 311, but also makes it difficult for the airflow in the air guide duct 311 to smoothly integrate into the main heat dissipation flow path, weakening the continuous scouring and cooling effect on the high-temperature zone 5. To overcome the above-mentioned potential problem of unsmooth airflow convergence, this embodiment further limits the connection structure between the air guide duct 311 and the air duct 4.

[0035] Please see Figures 5 to 6In this embodiment, the air passage 4 is connected to the air guide passage 311 through the inlet hole 6. The inlet hole 6 is set at an angle, and the angle between the axis of the inlet hole 6 and the extension direction of the air passage 4 is less than 90 degrees; preferably, the angle ranges from 30 degrees to 40 degrees. If the angle is greater than 75 degrees, the momentum direction of the airflow when it merges into the main air passage 4 in the air guide passage 311 changes too much, weakening the effect of reducing eddies; if the angle is less than 15 degrees, the length of the inlet hole 6 increases significantly, which not only increases the manufacturing difficulty, but also increases the friction loss along the path due to the long and narrow passage, which is not conducive to the rapid response of the airflow.

[0036] Furthermore, the connection point between the inlet hole 6 and the airway 4 is the inlet section of the airway 4.

[0037] In the above structure, air in the air guide duct 311 enters the air duct 4 through the inlet hole 6. Because the inlet hole 6 is inclined relative to the extension direction of the air duct 4, the air has a flow tendency along the direction of the air duct 4 when entering, thus allowing it to enter the air duct 4 more smoothly. Compared with a vertical connection, this inclined arrangement reduces the impact of air entering the air duct 4 on the main airflow, reduces local disturbances, and makes it easier for the air in the air guide duct 311 to merge into the flow path within the air duct 4. Simultaneously, placing the inlet hole 6 at the entrance section of the air duct 4 allows the air in the air guide duct 311 to participate in the flow along a longer path of the air duct 4 after entering, which is beneficial for improving the utilization efficiency of this portion of air and avoiding local unevenness caused by introducing airflow in the later section of the air duct 4. Under the effect of the above structure, the airflow transition between the air guide duct 311 and the air duct 4 is more stable, thereby improving the matching between the auxiliary air guide path and the main heat dissipation path. Based on the above structure, the back pressure of the airflow at the outlet of the air duct 311 is effectively reduced, ensuring that the air diverted from the intake pipe 23 to the air duct cavity 321 can flow through the groove 31 area of ​​the mounting plate 3 with low resistance. This ensures that the air duct 311 always maintains a sufficient flow of fresh cooling air, thereby achieving continuous and stable local cooling of the high-temperature zone 5 between the first motor 1 and the second motor 2, and preventing heat accumulation and rebound caused by poor airflow.

[0038] Understandably, the inclined placement of the inlet hole 6 allows the air entering the air duct 4 from the air guide duct 311 to have a flow tendency along the extension direction of the air duct 4, thus enabling it to continue flowing along the direction of the air duct 4. If the inlet hole 6 were vertically positioned, the air entering the air duct 4 would easily experience a sudden change in direction, creating a discontinuous flow phenomenon in a local area, thereby affecting the stable distribution of airflow within the air duct 4. However, by being inclined, the air can maintain the original airflow direction after entering the air duct 4, thus making it easier to participate in the continuous flow within the air duct 4.

[0039] It should also be noted that placing the inlet hole 6 within the inlet section ensures that the cooling airflow entering through the air guide 311 and the main airflow are fully mixed and exchange kinetic energy before entering the complex bend flow path, thus avoiding the aggravation of local turbulence caused by the convergence at the bend.

[0040] Example 3: The basic content is the same as in Example 1, except that: In Embodiment 1, air in the air guide cavity 321 enters the air guide duct 311 through a connecting structure on the assembly plate 3 to achieve localized cooling of the high-temperature zone 5. However, in actual operation, if the air guide cavity 321 and the air guide duct 311 are connected only through a single orifice or a locally concentrated group of orifices, air will mainly flow into the air guide duct 311 from the orifice near the air inlet side, resulting in extremely uneven airflow distribution along the length of the air guide duct 311. Although the cooling effect is better in the area of ​​the air guide duct 311 near the perforation 34, the airflow at the end of the air guide duct 311 far from the perforation 34 is significantly insufficient, resulting in obvious uneven cooling of the high-temperature zone 5 and failing to achieve comprehensive and balanced heat dissipation of the high-temperature zone 5. To solve the above-mentioned problem of uneven airflow distribution, this embodiment further optimizes the connecting structure between the air guide cavity 321 and the air guide duct 311.

[0041] Please see Figures 5 to 7 In this embodiment, the assembly plate 3 has a through hole 34, and the air guide cavity 321 is connected to the air guide duct 311 through the through hole 34.

[0042] Furthermore, there are several perforations 34, which are distributed along the extension direction of the air guide 311, and the diameter of the perforations 34 increases sequentially along the airflow direction.

[0043] In the above structure, air in the air guide cavity 321 enters the air guide duct 311 through multiple perforations 34. Since the perforations 34 are distributed along the extension direction of the air guide duct 311, air from the air guide cavity 321 can be obtained at different positions in the air guide duct 311, thus avoiding the problem of air only concentrating at the front end of the air guide duct 311. Simultaneously, as the air flows within the air guide duct 311, its flow conditions change. By appropriately increasing the diameter of the perforations 34 located in the rear section, more air can be obtained in the rear section of the air guide duct 311, thereby forming a more uniform airflow distribution along the length of the air guide duct 311. Under the action of the above structure, the cooling of the high-temperature zone 5 by the air guide duct 311 is more uniform, while ensuring that the air entering from the air guide cavity 321 can stably replenish the air duct 4 without affecting the function of the air duct 4 as the main heat dissipation channel.

[0044] Furthermore, the perforations 34 in the above structure are only formed on the wall surface inside the assembly plate 3 corresponding to the air guide cavity 321 and the air guide duct 311, while no perforations 34 are provided in the heat insulation cavity 322 and its partition plate 323 inside the assembly plate 3 used to isolate the two air guide cavities 321. In other words, the distribution range of the perforations 34 completely avoids the area where the heat insulation cavity 322 is located on the projection perpendicular to the plane of the assembly plate 3. This arrangement ensures that the cooling air in the air guide cavity 321 can smoothly enter the air guide duct 311, while maintaining the integrity and airtightness of the heat insulation cavity 322, preventing cooling air from leaking into the heat insulation cavity 322 and weakening its heat insulation performance, thereby ensuring that the low thermal conductivity gas insulation layer in the embodiment always effectively blocks the heat conduction between the first motor 1 and the second motor 2.

[0045] It should be noted that, in the main flow direction of the airflow within the air guide duct 311, the cross-sectional area of ​​the subsequent perforation 34 is larger than that of the preceding perforation 34. Preferably, the diameter increase of adjacent perforations 34 is 5-15%, and the diameter change trend along the flow direction shows a linear or exponential increase. If the diameter increase is too small, it cannot effectively compensate for the flow rate attenuation caused by the change in static pressure along the flow path within the air guide duct 311; if the diameter increase is too large, it may introduce too much airflow in the later section, causing local turbulence and disrupting the stability of the flow field within the air guide duct 311. By controlling the diameter increase pattern, an approximately uniform distribution of cooling airflow per unit length along the length of the air guide duct 311 can be achieved while considering manufacturing feasibility.

[0046] Example 4: The basic content is the same as in Example 1, except that: In the scheme of Embodiment 1, although the airflow organization between structures such as the air guide cavity 321, air guide duct 311, and air duct 4 achieves localized enhanced cooling of the high-temperature zone 5, in practical applications, the first motor 1 and the second motor 2 have different heat dissipation conditions due to their different positions in the stacked structure. Specifically, the first motor 1 is usually located above or to one side of the second motor 2, with relatively open airflow space around it and better natural convection conditions; while the second motor 2 is close to the mounting base or surrounded by other structures, and its heat dissipation conditions are relatively limited. In addition, the cooling air introduced by the air intake pipe 23 needs to flow through the internal air ducts 4 of the two motors successively. If the two motors use the same air duct 4 structure, the airflow distribution or temperature rise distribution along the path between the two motor housings may not be ideal. In order to balance the heat dissipation capacity of the two motors and further improve the overall heat exchange efficiency of the air duct 4, this embodiment has made targeted optimizations to the air duct 4 structure of the first housing 11 and the second housing 21 respectively.

[0047] Please see Figures 3 to 4In this embodiment, both ends of the first housing 11 are provided with first end caps 12. The air passage 4 on the first housing 11 is an S-shaped channel 13. The S-shaped channel 13 includes several long straight sections 131 and arc-shaped sections 132. The long straight sections 131 are arranged inside the first housing 11 along the axial direction of the first housing 11. The arc-shaped sections 132 are arranged on the end face of the first housing 11. An air inlet 111 is provided on the first housing 11, and the air inlet 111 is connected to the long straight sections 131. A first air outlet 121 is provided on the first end cap 12 at the position corresponding to the air outlet end of the S-shaped channel 13. The first air outlet 121 is used for air to be discharged from the S-shaped channel 13.

[0048] It should be noted that the first shell 11 adopts an S-shaped channel 13. On the one hand, it utilizes the structural space of the first end caps 12 at both ends of the first shell 11, and arranges the arc-shaped section 132 at the end face. Without increasing the radial dimension of the shell, it effectively extends the airflow path and increases the contact time between the air and the inner wall of the shell, thereby improving the heat carrying capacity per unit mass of air. On the other hand, the multiple reversal sections of the S-shaped channel 13 generate a moderate turbulence effect during the airflow process, enhancing the convective heat transfer coefficient of the airflow. At the same time, the inlet section of the S-shaped channel 13 corresponds to the outlet position of the air guide duct 311, so that the auxiliary cooling air entering from the air guide duct 311 can be fully mixed with the main airflow at the initial stage of entering the S-shaped channel 13, ensuring that the cooling air in the high-temperature zone 5 can preferentially participate in the heat transfer process of the longest path within the first shell 11.

[0049] Furthermore, both ends of the second housing 21 are provided with second end caps 22. The air passage 4 on the second housing 21 includes several long straight channels 211 connected in series through connecting holes 221. The long straight channels 211 are distributed along the axial direction of the second housing 21. The air inlet pipe 23 is connected to one of the long straight channels 211. The connecting hole 221 is opened on the side of the second end cap 22 near the second housing 21. The connecting hole 221 located at the air outlet end of the air passage 4 on the second housing 21 penetrates the second end cap 22, and the connecting hole 221 is used to discharge the air input by the air inlet pipe 23.

[0050] It should be noted that the second housing 21 adopts a structure of multiple long straight channels 211 connected in series. The long straight channels 211 extend along the axial direction of the second housing 21, so that the cooling airflow can uniformly cover the inner wall surface along the circumference of the housing, especially forming a continuous and uniform cooling effect on the high temperature zone 5 near the assembly plate 3, avoiding the uneven temperature distribution along the path that may be caused by multiple reversals, where the temperature is higher at the front and lower at the back. At the same time, the air inlet pipe 23 is directly connected to the long straight channels 211, shortening the length of the inlet section after the airflow enters the second housing 21, effectively reducing local resistance loss. In addition, the connecting hole 221 used to connect the long straight channels 211 is opened on the side end face of the second end cover 22, making full use of the structural space of the end cover. Under the condition of limited installation space on the end face of the second housing 21, the compact turning and series connection of the airflow is achieved, taking into account both processing convenience and assembly feasibility.

[0051] Furthermore, silencers 7 are installed in both the first air outlet 121 and the connecting hole 221 located at the air outlet end of the air passage 4 on the second housing 21. The silencers 7 not only reduce aerodynamic noise caused by high flow velocity and abrupt changes in the flow channel cross-section during airflow discharge, but also serve to rectify and reduce pressure. Specifically, the sound-absorbing material or porous structure inside the silencer 7 makes the velocity gradient of the discharged airflow more gradual, thereby reducing jet noise at the air outlet and disturbance to the external environment. In addition, since the silencer 7 is located at the air outlet end of the air passage 4, it has slight flow resistance, which objectively creates a slight positive pressure effect inside the air passage 4. This slight positive pressure helps to prevent external dust and moisture from flowing back into the air passage 4 through the air outlet, thereby improving the user experience and indirectly protecting the cleanliness of the air passage 4, extending the motor's maintenance cycle.

[0052] It is understood that the S-shaped channel 13 is composed of several long straight sections 131 and arc-shaped sections 132, which increases the airflow path within the first housing 11, thereby increasing the heat exchange time between the air and the housing. Multiple long straight channels 211 within the second housing 21 are sequentially connected by connecting holes 221, allowing air to flow sequentially through multiple channels. In this structure, the air supplied to the air duct 4 by the air guide 311 flows together with the main path air within the air duct 4 structure, thus continuously dissipating heat inside the housing. Furthermore, a silencer 7 is installed at the air outlet of the air duct 4 to silence the exhaust air. Through the cooperation of the air duct 4 structure and the air guide structure, the air in the system can both locally cool the high-temperature zone 5 and dissipate heat overall within the air duct 4, thereby improving the overall heat dissipation effect while ensuring the air duct 4 plays a dominant role in heat dissipation.

[0053] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air-cooled crosshead motor, characterized in that, It includes an assembly plate (3) disposed between the first motor (1) and the second motor (2). The first motor (1) and the second motor (2) respectively include a first housing (11) and a second housing (21). The first housing (11), the assembly plate (3) and the second housing (21) are connected in sequence. Air passages (4) are provided in both the first housing (11) and the second housing (21). A high-temperature zone (5) is formed at the contact point between the first housing (11), the second housing (21) and the assembly plate (3). A groove (31) is provided on the assembly plate (3) corresponding to the high-temperature zone (5). The inner wall of the groove (31) and the outer surfaces corresponding to the first housing (11) and the second housing (21) respectively form an air guide channel (311). The air passage (4) is connected to the corresponding air guide channel (311). The assembly plate (3) has a cavity (32) inside, and the cavity (32) is formed by two partition plates (323) to form a heat insulation cavity (322) and two air guide cavities (321). The heat insulation cavity (322) is located between the two air guide cavities (321). The two air guide cavities (321) are respectively connected to the air guide ducts (311) corresponding to the first shell (11) and the second shell (21). One of the air passages (4) is connected to the air inlet pipe (23), the air inlet pipe (23) passes through the assembly plate (3), and the air inlet pipe (23) is connected to the air guide cavity (321). The connection between the air guide cavity (321) and the air inlet pipe (23) is located upstream of the connection between the air passage (4) and the air inlet pipe (23) in the first housing (11). The air intake pipe (23), air guide cavity (321), air guide duct (311) and air duct (4) are connected in sequence.

2. The air-cooled crosshead motor according to claim 1, characterized in that, The air passage (4) is connected to the air duct (311) through the inlet hole (6). The inlet hole (6) is set in an inclined manner, and the angle between the axis of the inlet hole (6) and the extension direction of the air passage (4) is less than 90 degrees.

3. The air-cooled crosshead motor according to claim 2, characterized in that, The connection point between the inlet hole (6) and the airway (4) is the inlet section of the airway (4).

4. The air-cooled crosshead motor according to claim 1, characterized in that, The assembly plate (3) has a perforation (34), and the air guide cavity (321) is connected to the air guide duct (311) through the perforation (34).

5. The air-cooled crosshead motor according to claim 4, characterized in that, The number of the perforations (34) is several, and the several perforations (34) are distributed along the extension direction of the air guide (311), and the aperture of the several perforations (34) increases sequentially along the air flow direction.

6. The air-cooled crosshead motor according to claim 1, characterized in that, The air inlet pipe (23) is provided with a first air hole (24) corresponding to the air guide cavity (321), and the assembly plate (3) is provided with a second air hole (33) communicating with the air guide cavity (321). The air inlet pipe (23) is connected to the air guide cavity (321) through the first air hole (24) and the second air hole (33).

7. The air-cooled crosshead motor according to claim 1, characterized in that, The heat insulation cavity (322) is a closed cavity, and the heat insulation cavity (322) is filled with a low thermal conductivity gas.

8. The air-cooled crosshead motor according to claim 1, characterized in that, Both ends of the first housing (11) are provided with first end caps (12). The air passage (4) on the first housing (11) is an S-shaped channel (13). The S-shaped channel (13) includes several long straight sections (131) and arc-shaped sections (132). The long straight sections (131) are arranged in the first housing (11) along the axis of the first housing (11). The arc-shaped sections (132) are arranged on the end face of the first housing (11). An air inlet (111) is provided on the first housing (11), and the air inlet (111) is connected to the long straight section (131). A first air outlet (121) is provided on the first end cap (12) at the position corresponding to the air outlet end of the S-shaped channel (13). The first air outlet (121) is used for the air to be discharged from the S-shaped channel (13).

9. The air-cooled crosshead motor according to claim 8, characterized in that, The second housing (21) is provided with a second end cap (22) at both ends. The air passage (4) on the second housing (21) includes a number of long straight channels (211) connected in series through a connecting hole (221). The long straight channels (211) are distributed along the axial direction of the second housing (21). The air inlet pipe (23) is connected to one of the long straight channels (211). The connecting hole (221) is opened on the side of the second end cap (22) near the second housing (21). The connecting hole (221) at the air outlet end of the air passage (4) on the second housing (21) penetrates the second end cap (22), and the connecting hole (221) is used to discharge the air input by the air inlet pipe (23).

10. The air-cooled crosshead motor according to claim 9, characterized in that, Both the first air outlet (121) and the connecting hole (221) located at the air outlet end of the upper air passage (4) of the second housing (21) are equipped with silencers (7).

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