A valve assembly and a servo valve using a flow channel for heat dissipation

Abstract

The utility model provides a kind of valve assembly and servo valve using runner heat dissipation, belong to servo valve technical field, including valve body and motor stator installed on valve body;The motor installation well is provided on the valve body, and motor stator is installed in the motor installation well;The valve body is internally provided with multiple fluid passages;Valve body inside is further provided with heat dissipation runner, and heat dissipation runner is at least one part of fluid passage in multiple fluid passages;Heat dissipation runner is set in the area of valve body inside close to motor installation well;Using such a kind of valve assembly and servo valve using runner heat dissipation, heat is generated in the operation process of motor, and heat is transferred to the well wall of motor installation well, and hydraulic oil passes through heat dissipation runner and plays the role of temperature reduction and heat dissipation in the area near motor installation well. It can significantly improve motor operating temperature, improve the reliability and life of servo valve, improve servo valve performance stability, and compact structure, high integration.

Description

Technical Field

[0001] This utility model belongs to the field of servo valve technology, and more specifically relates to a valve assembly that utilizes flow channel heat dissipation and a servo valve. Background Technology

[0002] In modern high-performance hydraulic servo systems, electro-hydraulic servo valves are the core control components for achieving high precision and dynamic response. They typically integrate electromagnetic drive devices such as torque motors or linear motors to precisely control the valve spool position. However, during prolonged operation or high-frequency actuation of the servo valve, significant heat accumulation occurs due to copper losses (coil resistance heating) and iron losses (core eddy current and hysteresis losses) within the motor. This can ultimately lead to the burnout of electronic components or the motor itself. Utility Model Content

[0003] One objective of this utility model is to provide a valve assembly that utilizes flow channels for heat dissipation. The valve assembly includes a valve body and a motor stator mounted on the valve body. The valve body is provided with a motor mounting well, and the motor stator is mounted inside the motor mounting well. The valve body has multiple fluid channels inside.

[0004] The valve body is also provided with a heat dissipation channel, which is part of at least one of the multiple fluid channels; the heat dissipation channel is located in the area inside the valve body near the motor mounting well.

[0005] Preferably, the multiple fluid channels inside the valve body include: an oil supply channel, an oil return channel, a control channel A, and a control channel B; the oil supply channel is used to connect to the hydraulic pump, the oil return channel is used to connect to the oil tank, and the control channels A and B are used to connect to the hydraulic actuator.

[0006] Preferably, the heat dissipation channel is part of the oil supply channel.

[0007] Preferably, the heat dissipation channel is part of the oil return port channel.

[0008] Preferably, the heat dissipation channel is in close contact with the wall of the motor mounting well of the valve body, or the heat dissipation channel is embedded inside the wall of the motor mounting well of the valve body.

[0009] Preferably, a portion of the heat dissipation channel is disposed circumferentially or radially along the side wall region of the motor mounting well of the valve body.

[0010] Preferably, a portion of the heat dissipation channel is located in the bottom region of the motor mounting well adjacent to the valve body.

[0011] Preferably, a portion of the heat dissipation channel has a spiral structure in the area adjacent to the motor mounting well, or it has an annular channel or serpentine channel surrounding the motor mounting well.

[0012] Preferably, the wall of the motor mounting well at least surrounds a portion of the outer wall of the motor stator.

[0013] Another objective of this invention is to provide a servo valve, which includes a valve assembly that utilizes a flow channel for heat dissipation as described above. Beneficial effects

[0014] As described above, this utility model discloses a valve assembly and servo valve that utilize flow channel heat dissipation. During motor operation, heat is generated and transferred to the well wall of the motor mounting well. Hydraulic oil, passing through the heat dissipation flow channel, cools and dissipates heat in the area near the motor mounting well. This significantly improves the motor operating temperature, enhances the reliability and lifespan of the servo valve, and improves the performance stability of the servo valve. Furthermore, it features a compact structure and high integration. Attached Figure Description

[0015] The present invention will be more fully understood through the following detailed description and in conjunction with the accompanying drawings, wherein similar elements are numbered in a similar manner, wherein:

[0016] Figure 1 This is a schematic diagram of a valve assembly that utilizes a flow channel for heat dissipation according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the fluid channel of a valve assembly that utilizes flow channel heat dissipation according to an embodiment of this utility model.

[0018] In the diagram: Valve body 11, motor stator 12, heat dissipation channel 13, motor bracket 14, motor mounting well 15, oil supply port channel 21, oil return port channel 22, control port channel A, and control port channel B. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that if any directional indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of this utility model, such directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings, but this utility model is not limited to the following embodiments.

[0023] In modern high-performance hydraulic servo systems, electro-hydraulic servo valves are the core control components for achieving high precision and dynamic response. They typically integrate electromagnetic drive devices such as torque motors or linear motors to precisely control the valve spool position. However, during prolonged operation or high-frequency actuation of the servo valve, significant heat accumulation occurs due to copper losses (coil resistance heating) and iron losses (core eddy current and hysteresis losses) within the motor. This can ultimately lead to the burnout of electronic components or the motor itself.

[0024] To address the aforementioned issues, this embodiment provides a valve assembly that utilizes flow channels for heat dissipation. The valve assembly includes a valve body 11 and a motor stator 12 mounted on the valve body 11. The valve body 11 is provided with a motor mounting well 15, and the motor stator 12 is mounted within the motor mounting well 15. The valve body 11 has multiple fluid channels inside.

[0025] The valve body 11 is also provided with a heat dissipation channel 13, which is part of at least one of the multiple fluid channels; the heat dissipation channel 13 is located in the area inside the valve body 11 near the motor mounting well 15.

[0026] Servo valves, with their high-precision control, fast response, wide pressure range, high reliability, and energy efficiency, are widely used in shipbuilding and machinery, metallurgy and energy, aerospace, and other fields. Their core components include the valve body assembly, drive elements, and control circuitry. Currently, servo valves (especially high-frequency response direct-drive servo valves) experience significant Joule heating in the motor windings during prolonged operation due to high-frequency current, reaching temperatures exceeding 100°C. Therefore, the reliability of the control circuitry is crucial to the overall reliability of the servo valve. High temperatures accelerate the thermal aging of adjacent circuit board components, reducing their lifespan by more than 50%, and cause irreversible demagnetization of the motor magnets, degrading motor performance. Furthermore, high temperatures can increase the error of the motor angle sensor due to excessive temperature drift, leading to increased valve opening error.

[0027] In this embodiment, as Figure 1 As shown, the valve body 11 can be integrally formed by additive manufacturing or formed by casting technology. A fluid passage is used to connect to hydraulic equipment. The valve assembly also includes a valve core and a valve sleeve, with the valve sleeve disposed inside the valve body 11 and the valve core inside the valve sleeve. The motor includes a motor rotor and a motor stator 12, with the motor rotor driving the valve core to axially translate within the valve sleeve.

[0028] The valve sleeve can be integrated into the valve body 11 and integrally formed with the valve body 11. Alternatively, the valve sleeve can be a separate part from the valve body 11 and assembled inside the valve body 11.

[0029] The mounting surface on the outside of the valve body 11 is provided with an interface for each fluid channel. The fluid channel is a cavity inside the valve body 11. One end of the fluid channel is on the mounting surface of the valve body 11 and is used to connect to the hydraulic equipment. The other end of the fluid channel is connected to the valve sleeve. The valve sleeve is provided with a through hole. The valve core moves axially at both ends inside the valve sleeve. The valve core is provided with a step so that the step on the valve core blocks the through holes at different positions of the valve sleeve, thereby forming different passages to control the flow rate and direction of the hydraulic oil, and ultimately control the hydraulic equipment to perform corresponding actions.

[0030] In this embodiment, the valve assembly is provided with a heat dissipation channel 13. The heat dissipation channel 13 is located in the middle of at least one fluid channel. The hydraulic oil is connected to the fluid channel through the interface on the mounting surface of the valve body 11, and then passes through the heat dissipation channel 13 and the branch structure of the channel to connect with the through hole on the valve sleeve.

[0031] The cooling channel 13 flows through the area of ​​the motor valve body 11 adjacent to the motor. During the operation of the servo valve, the motor generates a large amount of heat, which is then transferred to the area of ​​the valve body 11 in contact with the motor, specifically the area near the motor mounting well 15. The temperature of the hydraulic oil flowing through the cooling channel 13 is lower than the temperature of this area, thus playing a role in cooling and heat dissipation.

[0032] In some embodiments, the servo valve body 11 is made of high-strength aluminum alloy casting. A cylindrical motor mounting well 15 is provided at the center of the valve body 11 for fixing a brushless DC motor. The motor mounting well 15 has a depth of 35mm, an inner diameter of 28mm, a gap of 0.5mm between it and the motor housing, and is filled with thermally conductive silicone grease.

[0033] In some embodiments, a motor bracket 14 is also provided on the valve body 11. The motor bracket 14 is a ring-shaped structure. The motor bracket 14 is connected to the valve body 11 by bolts, and the motor bracket 14 serves to fix the motor stator 12.

[0034] In some embodiments, the heat dissipation channel 13 is designed as a C-shaped surrounding structure with an outer diameter of 8 mm and an inner diameter of 6 mm, tightly wrapped around the outer peripheral wall of the motor mounting well 15.

[0035] The heat dissipation channel 13 is press-fitted to the well wall with an interference fit, and the contact surface is coated with a high thermal conductivity ceramic coating to ensure efficient heat transfer from the motor → the well wall of the motor mounting well 15 → the spiral tube → the flowing hydraulic oil.

[0036] In the specific implementation process, the hydraulic oil circuit inside the servo valve, which originally did not flow directly through the motor area, was redesigned so that it flows purposefully through the valve body 11 area near the motor mounting base, using the flow of oil to carry away heat.

[0037] The Joule heat generated by an electric motor during high-frequency operation is a definite and continuous heat source. Increased motor temperature leads to a series of problems, such as increased resistance, weakened magnetism, material aging, and performance drift. Hydraulic systems, on the other hand, inherently possess flowing, relatively cool hydraulic oil. Utilizing the system's own oil as a cooling medium eliminates the need for an additional cooling system, aligning with the principles of system integration and optimization.

[0038] The heat generated by the motor is conducted to the metal material of the valve body 11. A flow channel is designed inside the valve body 11 to allow the low-temperature oil to flow through the metal wall near the motor. The oil contacts the metal wall and carries away the heat of the metal through convection heat transfer. The oil has good fluidity and a certain heat capacity. As long as the flow channel is designed properly, the contact area is sufficient, and the flow rate is appropriate, an effective heat conduction path can be established.

[0039] Computational fluid dynamics simulations can be used to optimize the shape, location, and cross-sectional area of ​​the flow channels, ensuring effective cooling of the motor area without significantly increasing flow resistance or affecting the performance of the main oil circuit. Sealing is also crucial to ensure that the cooling oil does not leak into the motor cavity or other areas where oil should not be present.

[0040] This heat dissipation method directly guides the cooling medium to the vicinity of the heat source, shortening the heat conduction path and significantly improving heat dissipation efficiency. Compared to relying solely on natural heat dissipation from the valve body 11 or external air convection, this active, integrated cooling method offers superior performance.

[0041] For the cooling system of the servo valve, directly guiding the cooling medium to the vicinity of the heat source shortens the heat conduction path and significantly improves heat dissipation efficiency. This effectively reduces the temperature of the motor coil and the nearby valve body 11, bringing it closer to or even maintaining it within the optimal operating temperature range.

[0042] For the service life of servo valves, the motor operates at a lower temperature, which greatly slows down the aging rate of the coil insulation material, reducing the risk of inter-turn short circuits or burnout; the magnet performance is more stable and less prone to demagnetization, and the thermal stress of the valve body material is reduced.

[0043] Temperature is a crucial factor affecting the static performance and dynamic response of servo valves, thus impacting their stability. Maintaining a stable motor temperature effectively reduces performance parameter drift caused by temperature rise, resulting in more consistent and predictable performance of the servo valve throughout its operating cycle.

[0044] In addition, this heat dissipation system has a compact structure and high integration, eliminating the need to add heat sinks, fans, or additional cooling pipes to the outside of the valve, thus maintaining the compact structure and easy installation characteristics of the servo valve.

[0045] By cleverly utilizing hydraulic oil, which is essential to the system and requires cooling, as a cooling medium, resource recycling is achieved, which aligns with the concepts of energy conservation and system optimization.

[0046] Furthermore, such as Figure 2 As shown, the multiple fluid channels inside the valve body 11 include: oil supply channel 21, oil return channel 22, control channel A, and control channel B; oil supply channel 21 is used to connect to the hydraulic pump, oil return channel 22 is used to connect to the oil tank, and control channel A and control channel B are used to connect to the hydraulic actuator.

[0047] In this embodiment, to facilitate the demonstration of the fluid channel structure, Figure 2 The fluid channel is shown in solid form, but in reality, the fluid channel is a cavity set inside the valve body 11.

[0048] Furthermore, the heat dissipation channel 13 is part of the oil supply channel 21.

[0049] Furthermore, the heat dissipation channel 13 is part of the oil return channel 22.

[0050] Furthermore, the heat dissipation channel 13 is in close contact with the wall of the motor mounting well 15 of the valve body 11, or the heat dissipation channel 13 is embedded inside the wall of the motor mounting well 15 of the valve body 11.

[0051] Furthermore, a portion of the heat dissipation channel 13 is disposed in the circumferential or radially extending area of ​​the side wall region of the motor mounting well 15 of the valve body 11.

[0052] Furthermore, a portion of the heat dissipation channel 13 is located in the bottom region of the motor mounting well 15 adjacent to the valve body 11.

[0053] Furthermore, a portion of the heat dissipation channel 13 has a spiral structure in the area adjacent to the motor mounting well 15, or it has an annular channel or serpentine channel surrounding the motor mounting well 15.

[0054] Furthermore, the wall of the motor mounting well 15 at least surrounds a portion of the outer wall of the motor stator 12.

[0055] Another objective of this embodiment is to provide a servo valve, which includes a valve assembly that utilizes a flow channel for heat dissipation as described above.

[0056] In various embodiments of this utility model, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this utility model embodiment.

[0057] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. It is particularly important to note that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0058] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

[0059] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A valve assembly utilizing a flow passage for heat dissipation, characterized by: The valve assembly includes a valve body (11) and a motor stator (12) mounted on the valve body (11); a motor mounting well (15) is provided on the valve body (11), and the motor stator (12) is installed in the motor mounting well (15); multiple fluid channels are provided inside the valve body (11); The valve body (11) is also provided with a heat dissipation channel (13), which is part of at least one of the multiple fluid channels; the heat dissipation channel (13) is located in the area inside the valve body (11) near the motor mounting well (15).

2. The valve assembly of claim 1, wherein: The valve body (11) has multiple fluid channels inside, including: oil supply channel (21), oil return channel (22), control channel A, and control channel B; oil supply channel (21) is used to connect to the hydraulic pump, oil return channel (22) is used to connect to the oil tank, and control channel A and control channel B are used to connect to the hydraulic actuator.

3. A valve assembly utilizing flow channels for heat dissipation as defined in claim 2, wherein: The heat dissipation channel (13) is part of the oil supply channel (21).

4. The valve assembly of claim 2, wherein: The heat dissipation channel (13) is part of the oil return channel (22).

5. A valve assembly utilizing flow channel heat dissipation according to any one of claims 1-4, characterized in that: The heat dissipation channel (13) is close to the wall of the motor mounting well (15) of the valve body (11), or the heat dissipation channel (13) is embedded inside the wall of the motor mounting well (15) of the valve body (11).

6. A valve assembly utilizing flow channel heat dissipation according to any one of claims 1-4, characterized in that: A portion of the heat dissipation channel (13) is provided in the circumferential or radial extension of the side wall region of the motor mounting well (15) of the valve body (11).

7. A valve assembly utilizing flow channel heat dissipation according to any one of claims 1-4, characterized in that: A portion of the heat dissipation channel (13) is located in the bottom region of the motor mounting well (15) adjacent to the valve body (11).

8. A valve assembly utilizing flow channel heat dissipation according to any one of claims 1-4, characterized in that: A portion of the heat dissipation channel (13) is in a spiral structure in the area adjacent to the motor mounting well (15), or in an annular channel or serpentine channel surrounding the motor mounting well (15).

9. A valve assembly for heat dissipation using a flow channel according to claim 1, characterized in that: The wall of the motor mounting well (15) at least surrounds a portion of the outer wall of the motor stator (12).

10. A servo valve, characterized in that, The servo valve includes a valve assembly that utilizes a flow channel for heat dissipation as described in any one of claims 1-9.

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