Bionic spiral flow channel structure of water-cooled motor shell of new energy vehicle

Abstract

The present application relates to the technical field of electric machines, in particular to a bionic spiral flow channel structure of a water-cooled machine shell of a new energy vehicle electric machine, comprising a machine body, the machine body comprising a machine shell, a continuous spiral cooling channel being embedded in the machine shell in a circumferential direction, the cooling channel being provided in a left-right through manner along the axial direction of the machine shell; a groove being provided on the inner wall surface of the cooling channel, a rotating shaft being fixedly installed in the groove, a flow guide vane being hingedly connected to the groove through the rotating shaft, so that the flow guide vane can rotate around the rotating shaft; a trigger groove being provided on the back flow surface of the flow guide vane, a memory spring being provided in the trigger groove, one end of the memory spring being fixedly connected to the bottom surface of the trigger groove, and the other end of the memory spring being fixedly connected to the bottom surface of the groove; when the temperature of the cooling liquid exceeds a set threshold value, the memory spring drives the flow guide vane to rotate around the rotating pivot from a closed position to an open position, so as to form a fluid turbulence structure; when the temperature decreases, the memory spring contracts and drags the flow guide vane to reset into the groove.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a biomimetic spiral flow channel structure for a water-cooled housing of a new energy vehicle motor. Background Technology

[0002] In the field of new energy vehicles, efficient heat dissipation of the drive motor is a key technology for ensuring vehicle performance and reliability. Existing water-cooled motor housings typically employ a fixed spiral flow channel design, using forced circulation of coolant to remove the heat generated during motor operation. However, this traditional structure presents a significant trade-off between heat dissipation efficiency and energy consumption.

[0003] Traditional fixed flow channels cannot dynamically adjust the cooling intensity according to the real-time heat load of the motor. Under low-temperature conditions (such as during motor startup or light-load operation on urban roads), the motor generates less heat, but the cooling flow rate of the fixed flow channel is constant. Excessive coolant circulation will lead to wasted pump power consumption, and excessive cooling will prolong the time it takes for the motor to warm up to its optimal operating temperature, increasing energy loss.

[0004] Under high-temperature conditions (such as high-speed cruising or hill climbing), the heat generated by the motor increases dramatically, and the insufficient turbulence intensity of the fixed flow channel becomes a bottleneck for heat dissipation. Because the flow channel structure is fixed, the coolant flow rate and turbulence cannot automatically increase with rising temperature, making it difficult to meet high heat dissipation demands. This creates an irreconcilable contradiction between heat dissipation efficiency and flow resistance. The turbulence structure designed to enhance heat dissipation leads to a significant increase in system flow resistance, not only increasing pump energy consumption but also inducing high-frequency fluid noise. Uneven temperature distribution is a prominent issue, easily causing localized overheating in the core area of ​​the motor, accelerating the aging of insulation materials and limiting continuous output capacity. Mineral deposits generated by long-term coolant operation significantly reduce heat exchange efficiency, and the static flow channel lacks a self-cleaning mechanism, increasing operating costs through frequent maintenance. Traditional fixed flow channels cannot adjust the cooling intensity according to the motor's real-time heat load. Under low-temperature conditions (such as during motor startup or light-load operation), excessive cooling flow leads to unnecessary pump power consumption waste; while under high-temperature conditions (such as high-speed driving or hill climbing), the insufficient turbulence intensity of the fixed flow channel fails to meet high heat dissipation demands, often resulting in localized motor overheating.

[0005] Therefore, there is an urgent need for a biomimetic spiral flow channel structure for the water-cooled housing of new energy vehicle motors to improve the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide a biomimetic spiral flow channel structure for the water-cooled housing of a new energy vehicle motor. Through a through-type cooling channel, the heat dissipation area is increased. The guide vanes and memory springs can adaptively adjust their opening and closing states according to temperature changes. At low temperatures, the flow channel remains unobstructed to significantly reduce flow resistance and water pump energy consumption; at high temperatures, it expands to form a highly efficient turbulent flow structure, significantly enhancing turbulent heat transfer intensity. This completely solves the inherent contradiction between heat dissipation and flow resistance in traditional solutions, thereby addressing the problems mentioned in the background art.

[0007] Traditional fixed flow channels cannot adjust the cooling intensity according to the real-time heat load of the motor. Under low-temperature conditions (such as during motor startup or light-load operation), excessive cooling flow can lead to unnecessary pump power consumption waste; while under high-temperature conditions (such as high-speed driving or climbing), the turbulence intensity of fixed flow channels is insufficient to meet the high heat dissipation requirements, often resulting in localized overheating of the motor.

[0008] To achieve the above objectives, the present invention provides a biomimetic spiral flow channel structure for a water-cooled housing of a new energy vehicle motor, comprising a body, the body including a housing, wherein a continuous spiral cooling channel is circumferentially embedded inside the housing, and the cooling channel is arranged to extend left and right along the axial direction of the housing.

[0009] The inner wall of the cooling channel has a groove, and a rotating shaft is fixedly installed in the groove. The guide vane is hinged to the groove through the rotating shaft, so that the guide vane can rotate around the rotating shaft.

[0010] The back surface of the guide vane is provided with a trigger groove, and a memory spring is provided in the trigger groove. One end of the memory spring is fixedly connected to the bottom surface of the trigger groove, and the other end is fixedly connected to the bottom surface of the groove.

[0011] When the coolant temperature exceeds the set threshold, the memory spring drives the guide vane to rotate around the pivot point from the closed position to the open position, forming a fluid turbulence structure. When the temperature decreases, the memory spring contracts and pulls the guide vane back into the groove.

[0012] In the above technical solution, when the coolant flows through the spiral cooling channel of the casing, its temperature change drives the memory spring to deform. When the temperature rises, the memory spring stretches due to heat, pushing the guide vane to rotate and unfold around the center of the flow channel, breaking the laminar boundary layer and inducing high-intensity turbulence, significantly enhancing heat transfer. When the temperature drops, the memory spring contracts, pulling the guide vane back to the groove and closing, eliminating additional flow resistance and restoring the channel to a low-resistance state. This process achieves integrated temperature sensing and action execution through a purely mechanical structure: the opening and closing angle of the guide vane changes continuously with the temperature, ensuring smooth fluid flow in low-temperature conditions (energy-saving mode), and enhancing heat transfer through eddies in high-temperature conditions (enhanced mode). At the same time, the micro-vibrations generated by the periodic opening and closing, together with the hydrophobic microgrooves on the surface, inhibit scale deposition, achieving noise reduction, scale prevention, and energy efficiency optimization simultaneously.

[0013] Based on this, when the coolant temperature changes, the memory spring drives the guide vane to dynamically adjust its opening and closing state. Under low temperature conditions, the spring contracts, and the guide vane is fully embedded in the groove and flush with the inner wall of the flow channel, eliminating flow interference and making the flow channel smooth and streamlined. Under high temperature conditions, the spring extends, pushing the guide vane to expand to an angle of 15-30 degrees with the center line of the flow channel, directly cutting the mainstream to form a high-intensity vortex. At the same time, the trapezoidal microgrooves on the surface induce secondary flow to generate local microvortices in the grooves. The dual composite turbulence significantly damages the thermal boundary layer.

[0014] Both the front and rear covers of the housing have annular water chambers. The front and rear ends of the guide vanes are connected to the end covers, forming a closed cooling loop by connecting the annular water chambers with the continuous circumferential spiral cooling channels inside the housing. Coolant flows into the annular water chambers from the inlet pipe of the rear cover, flows spirally along the housing axis through the spiral cooling channels to carry away the heat from the motor, and then flows into the annular water chamber of the front cover and out through the outlet pipe. When the guide vanes are opened and closed by memory springs in the cooling channels, the connection structure between their front and rear ends and the end covers ensures the sealing of the annular water chambers and the spiral channels, so that the coolant always circulates in a closed loop. At the same time, the equal cross-section design of the annular water chambers of the end covers can evenly distribute the flow rate of each section of the spiral channels, avoiding heat dissipation blind spots caused by uneven pressure at the inlet of the channels, and ensuring the stable operation of the cooling system.

[0015] In another technical solution, the memory spring is made of nickel-titanium based bidirectional shape memory alloy. The opening and closing motion of the guide vane generates micro-vibration, which reduces the adhesion of dirt on the inner wall of the cooling channel. The groove surface is covered with a hydrophobic coating with a thickness of 0.5-1 mm. The arc-shaped curved surface structure of the guide vane reduces the sound pressure level of fluid pulsation noise. The opening state of the guide vane reduces the cavitation rate in the cooling channel.

[0016] This technical solution utilizes a memory spring made of shape memory alloy. When the guide vanes open and close due to temperature changes, they vibrate. This vibration acts on the inner wall of the cooling channel, reducing the adhesion of scale and other dirt. Combined with a 0.5-1 mm hydrophobic coating on the groove surface, the arc-shaped curved structure of the guide vanes guides the fluid to form a smooth flow, reducing the sound pressure level of turbulent pulsation noise. At the same time, its open state creates turbulence in the flow channel, breaking up air bubbles in the fluid. Thus, it simultaneously achieves multiple effects of scale prevention, noise reduction, and cavitation protection during the heat dissipation process.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The biomimetic spiral flow channel structure of the water-cooled housing of the new energy vehicle motor increases the heat dissipation area through the through-type cooling channel. The guide vanes and memory springs can adaptively adjust their opening and closing states according to temperature changes. At low temperatures, the flow channel remains unobstructed to significantly reduce flow resistance and water pump energy consumption. At high temperatures, it unfolds to form a highly efficient turbulent flow structure, significantly enhancing the intensity of turbulent heat transfer and completely solving the inherent contradiction between heat dissipation and flow resistance in traditional solutions.

[0019] The vibration of the guide vane under force, combined with the surface grooves, effectively disrupts the physical conditions for scale deposition. Combined with its hydrophobic properties, it significantly extends the maintenance-free cycle of the system, greatly reduces the intensity of broadband noise, and suppresses cavitation effects to extend the life of the water pump. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0021] Figure 2 This is a schematic diagram of the overall unfolded structure of the embodiment;

[0022] Figure 3 This is a schematic diagram of the casing structure for an embodiment;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the casing in an embodiment;

[0024] Figure 5 This is a schematic diagram of the rear cover structure in an embodiment;

[0025] Figure 6 Examples Figure 4 A magnified schematic diagram of the central part of the structure;

[0026] Figure 7 This is a schematic diagram of the guide vane structure in an embodiment.

[0027] The meanings of the labels in the diagram are as follows:

[0028] 100. Body; 110. Housing; 111. Cooling channel; 112. Groove; 120. Front cover; 121. Water outlet pipe; 130. Rear cover; 131. Water inlet pipe; 132. Water cavity; 140. Guide vane; 141. Groove; 142. Trigger groove; 143. Memory spring. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Traditional fixed flow channels cannot adjust cooling intensity according to the real-time heat load of the motor. Under low-temperature conditions (such as motor startup or light load operation), excessive cooling flow can lead to unnecessary pump power consumption waste; while under high-temperature conditions (such as high-speed driving or climbing), the turbulence intensity of the fixed flow channel is insufficient to meet high heat dissipation requirements, often resulting in localized overheating of the motor. Please refer to [link to relevant documentation]. Figures 1-7 As shown, this embodiment provides a biomimetic spiral flow channel structure for a water-cooled housing of a new energy vehicle motor, including a body 100, the body 100 including a housing 110, and a continuous spiral cooling channel 111 embedded circumferentially inside the housing 110, the cooling channel 111 being arranged to extend left and right along the axial direction of the housing 110.

[0031] A groove 112 is formed on the inner wall of the cooling channel 111. A rotating shaft is fixedly installed in the groove 112. The guide vane 140 is hinged to the groove 112 through the rotating shaft, so that the guide vane 140 can rotate around the rotating shaft.

[0032] The back surface of the guide vane 140 is provided with a trigger groove 142, and a memory spring 143 is provided in the trigger groove 142. One end of the memory spring 143 is fixedly connected to the bottom surface of the trigger groove 142, and the other end is fixedly connected to the bottom surface of the groove 112.

[0033] When the coolant temperature exceeds the set threshold, the memory spring 143 drives the guide vane 140 to rotate around the pivot point from the closed position to the open position, forming a fluid turbulence structure. When the temperature decreases, the memory spring 143 contracts and pulls the guide vane 140 back into the groove 112.

[0034] During implementation, the coolant flows through the circumferentially continuous spiral cooling channel 111 inside the housing 110. When the motor operates and the coolant temperature exceeds the set threshold of the memory spring 143, the memory spring 143 undergoes a phase change due to the temperature rise and extends, pushing the trigger groove 142 on the back surface of the guide vane 140. This causes the guide vane 140 to rotate around the pivot in the groove 112 from a closed position flush with the inner wall of the flow channel to an open position of 15 to 25 degrees, forming a turbulent structure within the flow channel to enhance fluid turbulence and improve heat dissipation efficiency. When the coolant temperature decreases, the memory spring 143 contracts and pulls the guide vane 140 back to the groove 112 around the pivot, restoring the flow channel to a smooth state and reducing fluid resistance. During this process, the memory spring 143 drives the guide vane 140 to periodically open and close through temperature-triggered deformation, realizing the function of automatically adjusting the flow resistance and heat dissipation intensity of the cooling system according to the motor's heat load, without the need for external energy or an electronic control system.

[0035] See Figure 2 and Figure 5As shown, after the coolant is injected into the annular water cavity 132 from the water inlet pipe 131 of the rear cover 130, it is evenly distributed to the entire spiral flow channel through the inlet end of the spiral cooling channel 111. During the process of flowing through the spiral channel that runs axially through the housing 110, the coolant absorbs the heat from the motor and then flows into the annular water cavity 132 of the front cover 120. At this time, the water cavity 132 of the front cover 120 acts as a collection cavity, guiding the heated coolant to the water outlet pipe 121 to complete the circulation. This closed-loop circuit design ensures that the flow rate of each section of the spiral flow channel is balanced through the pressure equalization effect of the annular water cavity 132, eliminating the problem of uneven distribution in traditional parallel flow channels.

[0036] Figure 3 In the design, a continuous spiral cooling channel 111 is embedded circumferentially inside the housing 110. The channel extends axially along the housing 110, forming a spiral fluid path extending from one end of the housing 110 to the other. When the coolant flows through the channel, it undergoes a combined circumferential and axial motion along the spiral channel. Compared to a traditional straight channel, the spiral trajectory extends the contact path between the fluid and the inner wall of the housing 110, increasing the heat exchange time. At the same time, the centrifugal force generated by the spiral flow brings the fluid closer to the outer side of the housing 110, enhancing heat dissipation in the high-temperature areas of the motor. Furthermore, the continuous spiral structure avoids the interface resistance of traditional segmented flow channels, reducing fluid pressure drop and improving heat dissipation efficiency while ensuring the hydrodynamic performance of the cooling system.

[0037] Additionally, see Figure 4 As shown, the guide vane 140 is hinged to the groove 112 via a rotating shaft, forming a movable connection structure that can rotate around the shaft. When the coolant temperature changes, the memory spring 143 drives the guide vane 140 to rotate within the groove 112 with the rotating shaft as the fulcrum. At low temperatures, the guide vane 140 is in a closed state, adhering to the inner wall of the groove 112, keeping the flow channel smooth to reduce fluid resistance. At high temperatures, the guide vane 140 rotates out of the groove 112 to an open state, forming a turbulence structure within the flow channel. This hinged design ensures the flexibility of the guide vane 140's rotation while also limiting its placement within the groove 112, preventing displacement under high-speed fluid impact and ensuring the sealing of the guide vane 140 during rotation to prevent coolant leakage.

[0038] See Figure 6 As shown, when the guide vane 140 is driven by the memory spring 143 to perform an opening and closing motion and impact with the water flow, it will generate vibration. This vibration is transmitted to the surface of the flow channel through the mechanical coupling between the guide vane 140 and the inner wall of the cooling channel 111, causing the dirt adhering to the inner wall of the channel to be subjected to periodic shearing and impact forces. When the vibration energy exceeds the adhesion force between the dirt and the wall surface, the dirt particles will gradually peel off and be discharged with the coolant, thereby achieving a self-cleaning effect and avoiding the problem of reduced heat dissipation efficiency caused by scaling in traditional flow channels.

[0039] See Figure 7As shown, when the memory spring 143 contracts, the guide vane 140 is in a closed state, conforming to the inner wall of the groove 112. At this time, the inner wall of the flow channel is smooth, the fluid flow resistance is reduced, and the pressure is lowered. When the memory spring 143 extends, the guide vane 140 expands to form an angle of 15 to 30 degrees with the center line of the flow channel, forming a turbulent structure in the flow channel, which promotes turbulence in the fluid and enhances the heat dissipation effect. At the same time, the trapezoidal cross-section microgroove array 141 on the surface of the guide vane 140 generates secondary flow when the fluid flows through it, forming local vortices in the grooves 141. On the one hand, this enhances the heat exchange between the fluid and the inner wall of the casing 110, and on the other hand, the scouring effect of the vortex reduces dirt deposition and improves the self-cleaning ability.

[0040] When the memory spring 143, made of nickel-titanium-based bidirectional shape memory alloy, undergoes a phase change with the coolant temperature, it drives the guide vane 140 to open and close around the axis of rotation. The 0.5-1 mm hydrophobic coating covering the trapezoidal grooves 141 on the surface of the guide vane 140 works synergistically with the local eddies formed when the fluid flows through the grooves 141 to reduce surface fouling. At the same time, the arc-shaped curved surface structure of the guide vane 140 generates a scattering effect during fluid pulsation, reducing noise; and the turbulence structure formed when the guide vane 140 opens can break bubbles into microbubbles, avoiding cavitation damage to the inner wall of the casing 110, thus achieving a system-level performance improvement in heat dissipation, noise reduction, scale prevention, and anti-cavitation.

[0041] In this embodiment, the biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor, when in practical use, firstly, when the low-temperature coolant flows through the continuous spiral cooling channel 111 inside the housing 110, the memory spring 143 is in a contracted state, pulling the guide vane 140 to be fully embedded in the inner wall of the groove 112, forming a smooth flow channel surface. At this time, the fluid resistance is significantly reduced, achieving an energy-saving operation mode. As the motor operating temperature rises, the coolant temperature exceeds the set threshold, and the nickel-titanium-based memory spring 143 is heated and elongated to generate driving force, pushing the guide vane 140 to rotate and unfold around the center of the flow channel. When the guide vane 140 unfolds to an angle of 15-30 degrees with the center line of the flow channel, its frontal surface directly cuts the mainstream to form high-intensity turbulence; at the same time, the trapezoidal microgroove array 141 on the surface of the guide vane 140 induces secondary flow, generating local vortices within the grooves 141. The dual composite turbulence effect causes the thermal boundary layer to continuously break up, and the heat transfer intensity is greatly improved.

[0042] The guide vane 140 vibrates under the impact of the coolant, and the vibration is transmitted to the inner wall of the flow channel, breaking down the interface where scale crystals adhere. This, combined with the 0.5-1 mm thick hydrophobic coating on the surface of the microgrooves 141, creates a superhydrophobic effect. The unique aerodynamic curved surface of the guide vane 140 optimizes the fluid stripping point, shifting the phase of pressure pulsating sound waves by more than 120°, significantly reducing the broadband noise sound pressure level. In the deployed state, the precise gap formed between the guide lip and the flow channel wall can suppress the collapse of cavitation bubbles.

[0043] The coolant circulation path consists of a double-end cap annular water chamber 132 and a spiral channel forming a highly efficient closed loop: the cooling medium is injected into the annular distribution chamber from the inlet pipe 131 of the rear cover 130, evenly enters the spiral flow channel to absorb heat, and then flows into the outlet pipe 121 through the annular collecting chamber of the front cover 120. This symmetrical structure eliminates the problem of uneven flow distribution. Combined with the dynamic adjustment mechanism of the guide vane 140, it ultimately achieves a four-fold synergistic optimization of heat dissipation efficiency, flow resistance control, scale prevention capability, and noise suppression, without the need for an external control unit.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A biomimetic spiral flow channel structure for a water-cooled housing of a new energy vehicle motor, characterized in that: Includes a body (100), the body (100) includes a housing (110), the housing (110) has a continuous spiral cooling channel (111) embedded in the circumferential direction, the cooling channel (111) is arranged to run through the housing (110) axially; The inner wall of the cooling channel (111) has a groove (112) and a rotating shaft is fixedly installed in the groove (112). The guide vane (140) is hinged to the groove (112) through the rotating shaft, so that the guide vane (140) can rotate around the rotating shaft. The back surface of the guide plate (140) is provided with a trigger groove (142), and a memory spring (143) is provided in the trigger groove (142). One end of the memory spring (143) is fixedly connected to the bottom surface of the trigger groove (142), and the other end is fixedly connected to the bottom surface of the groove (112). When the coolant temperature exceeds the set threshold, the memory spring (143) drives the guide vane (140) to rotate around the pivot point from the closed position to the open position, forming a fluid turbulence structure. When the temperature decreases, the memory spring (143) contracts and pulls the guide vane (140) back into the groove (112).

2. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 1, characterized in that: When the memory spring (143) contracts, the guide plate (140) is in a closed state against the inner wall of the groove (112), and the flow channel pressure decreases. When the memory spring (143) extends, it expands to form an angle of 15 to 30 degrees with the center line of the flow channel.

3. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 1, characterized in that: The surface of the guide vane (140) is provided with an array of trapezoidal cross-section microgrooves (141), the grooves (141) are used to generate secondary flow when the fluid flows through them, and form local vortices in the grooves (141).

4. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 1, characterized in that: The front and rear ends of the guide vane (140) are respectively connected to the front cover (120) and the rear cover (130), and the front cover (120) and the rear cover (130) are provided with annular water cavities (132); the annular water cavities (132) and the spiral cooling channel (111) are connected to form a closed loop.

5. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 1, characterized in that: The front end of the housing (110) is connected to the front end cover (120) and the rear end cover (130) respectively. The front end cover (120) and the rear end cover (130) are provided with annular water chambers (132). The annular water cavity (132) and the spiral cooling channel (111) are connected to form a closed loop.

6. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 5, characterized in that: The rear cover (130) is connected to the inlet pipe (131), and the front cover (120) is connected to the outlet pipe (121). Both the inlet pipe (131) and the outlet pipe (121) are connected to the annular water cavity (132).

7. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 1, characterized in that: The memory spring (143) is made of nickel-titanium based bidirectional shape memory alloy.

8. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 1, characterized in that: The opening and closing motion of the guide vane (140) generates micro-vibrations, which reduce the adhesion of dirt to the inner wall of the cooling channel (111).

9. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 3, characterized in that: The surface of the groove (141) is covered with a hydrophobic coating with a thickness of 0.5-1 mm.

10. The biomimetic spiral flow channel structure of the water-cooled housing for a new energy vehicle motor according to claim 1, characterized in that: The arc-shaped curved surface structure of the guide vane (140) reduces the sound pressure level of fluid pulsation noise, and the open state of the guide vane (140) is used to reduce the cavitation rate in the cooling channel (111).

Images