Automatic power-off operating device and valve actuator

Abstract

The utility model provides an automatic power-off operating device and a valve actuator. The automatic power-off operation device (1) is used for a valve actuator (100) and comprises a detection assembly (11) and an operation matching part (12), the detection assembly (11) is arranged on the operation matching part (12) in a sleeving mode and comprises a coil (111) capable of being connected with current, the operation matching part (12) comprises a first part (121) with an open hole, and the first part (121) is arranged on the first part (121). When a metal manual device (2) used for implementing manual adjustment extends into the open hole, the coil (111) enables the manual device (2) to generate eddy current, and the electromagnetic property of the coil (111) changes due to the eddy current, so that the valve actuator (100) stops running. Operation of the valve actuator is stopped in the manual maintenance mode in a high-compatibility and wide-applicability mode.

Description

Technical Field

[0001] This disclosure relates to the field of valve actuators, and more specifically, to an automatic power-off operating device and a valve actuator. Background Technology

[0002] This section aims to provide background information relevant to understanding the various techniques described herein. As the title of this section implies, this is a discussion of related techniques that should in no way imply that they are necessarily prior art. Therefore, it should be understood that any statement in this section should be read in this context, rather than as an admission of any prior art.

[0003] When installing electric actuators, in some cases it is necessary to manually adjust the actuator's installation position to match the valve. For example, when the actuator is installed on a valve, the valve position sometimes needs to be manually adjusted. During the working cycle, the valve opening degree may also need to be manually adjusted. Utility Model Content

[0004] The purpose of this disclosure is to stop valve actuator operation in manual maintenance mode in a highly compatible and widely applicable manner.

[0005] Furthermore, the purpose of this disclosure is to solve or at least alleviate one or more problems existing in the prior art.

[0006] This disclosure solves the above problems by providing an automatic power-off operating device and a valve actuator. Specifically, according to one aspect of this disclosure, the following is provided:

[0007] An automatic power-off operating device for a valve actuator, comprising a detection component and an operating matching component, wherein the detection component is sleeved on the operating matching component, the detection component includes a coil capable of carrying current, and the operating matching component includes a first part with an opening, wherein when a metal manual device for manual adjustment is inserted into the opening, the coil causes the manual device to generate eddy currents, and the electromagnetic characteristics of the coil change due to the eddy currents, thereby stopping the valve actuator from operating.

[0008] Optionally, according to one embodiment of the present disclosure, the detection component is configured with a winding post and a sleeve portion, the coil is wound on the winding post, the sleeve portion is sleeved on the operation matching component, and the winding post is disposed on one side of the sleeve portion.

[0009] Optionally, according to one embodiment of the present disclosure, the automatic power-off operation device further includes a controller, the controller including a processing unit and an output unit, the processing unit sending a judgment command to the output unit in response to the detection value of the electromagnetic characteristic exceeding a preset electromagnetic characteristic threshold, and the output unit outputting a control command to stop the valve actuator in response to the judgment command.

[0010] Optionally, according to one embodiment of the present disclosure, the controller includes a data acquisition unit for acquiring the temperature of the coil, and the processing unit sets the electromagnetic characteristic threshold based on the temperature of the coil.

[0011] Optionally, according to one embodiment of this disclosure, the operation matching component includes a second part, the second part being configured with a shape matching structure, and the manual device operates by means of the first part and the shape matching structure.

[0012] Optionally, according to one embodiment of this disclosure, the automatic power-off operating device includes a load protection component and a motion transmission component sleeved on the load protection component. The load protection component and the motion transmission component form a motion transmission engagement. The motion transmission component is used for transmission engagement with the actuator rod of the valve actuator. The load protection component includes a normal operating state and a protection state. In the normal operating state, the second part transmits rotational motion to the load protection component. In the protection state, the second part disengages from the load protection component.

[0013] Optionally, according to one embodiment of the present disclosure, the second part is formed with a flange, which engages with the motion transmission member.

[0014] Optionally, according to one embodiment of the present disclosure, the end face of the second part facing the load protection member is provided with a toothed structure, and the end face of the load protection member facing the second part is provided with a groove. In the normal working state, the toothed structure engages with the groove, and in the protection state, the toothed structure disengages from the groove.

[0015] Optionally, according to one embodiment of the present disclosure, the automatic power-off operating device includes a spring that abuts against the load protection member and the motion transmission member in its longitudinal direction. In both the normal operating state and the protection state, the spring applies a spring force to the load protection member in the direction toward the second part.

[0016] Optionally, according to one embodiment of the present disclosure, the automatic power-off operating device includes a clamping element, which is clamped to the outer peripheral surface of the motion transmission member.

[0017] Optionally, according to one embodiment of this disclosure, the automatic power-off operating device includes a plug device that is hermetically engaged with the opening, the plug device being made of a non-metallic material.

[0018] Optionally, according to one embodiment of this disclosure, the sleeve portion is configured with a snap-fit ​​structure for snap-fit ​​connection with the valve actuator.

[0019] Optionally, according to one embodiment of this disclosure, the automatic power-off operation device includes the manual device.

[0020] According to another aspect of this disclosure, a valve actuator is provided, wherein the valve actuator includes any of the above-described automatic power-off operating devices. Attached Figure Description

[0021] Referring to the accompanying drawings, the above and other features of this disclosure will become apparent, wherein,

[0022] Figure 1 A partial schematic diagram of an automatic power-off operating device according to the present disclosure mounted on a valve actuator is shown;

[0023] Figure 2 A cross-sectional view of an automatic power-off operating device according to the present disclosure on a valve actuator is shown;

[0024] Figure 3 A schematic diagram showing the cooperation between a manual device and an automatic power-off operation device according to the present disclosure is shown;

[0025] Figure 4 A perspective view of a detection assembly without a coil according to the present disclosure is shown;

[0026] Figure 5 A perspective view of a detection assembly with a coil according to the present disclosure is shown;

[0027] Figure 6 A perspective view of an operational matching component according to the present disclosure is shown;

[0028] Figure 7 A cross-sectional view of an operational matching component according to the present disclosure is shown;

[0029] Figure 8 A perspective view of a load protection element according to the present disclosure is shown;

[0030] Figure 9 A perspective view of a motion transmission element and clamping element according to the present disclosure is shown;

[0031] Figure 10 A cross-sectional view of a motion transmission element and clamping element according to the present disclosure is shown;

[0032] Figure 11 A schematic diagram of a plug device according to the present disclosure mounted on a valve actuator is shown; and

[0033] Figure 12 A schematic diagram of the assembly of a plug device and an operating matching component according to the present disclosure is shown. Detailed Implementation

[0034] It is readily understood that, based on the technical solutions of this disclosure, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this disclosure. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solutions of this disclosure and should not be considered as the entirety of this disclosure or as limitations or restrictions on the technical solutions of this disclosure.

[0035] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," "third," and similar expressions are used for descriptive and distinguishing purposes only and should not be construed as indicating or implying the relative importance of the corresponding components.

[0036] Figure 1 A partial schematic diagram of an automatic power-off operating device according to the present disclosure mounted on a valve actuator is shown; Figure 2 A cross-sectional view of an automatic power-off operating device according to the present disclosure on a valve actuator is shown; Figure 3 A schematic diagram showing the cooperation between a manual device and an automatic power-off operation device according to the present disclosure is shown; Figure 4 A perspective view of a detection assembly without a coil according to the present disclosure is shown; Figure 5 A perspective view of a detection assembly with a coil according to the present disclosure is shown; Figure 6 A perspective view of an operational matching component according to the present disclosure is shown; and Figure 7 A cross-sectional view of an operational matching component according to the present disclosure is shown.

[0037] The automatic power-off operating device 1 is used for the valve actuator 100. The automatic power-off operating device 1 includes a detection component 11 and an operation matching component 12. The detection component 11 is sleeved on the operation matching component 12. The detection component 11 includes a coil 111 that can carry current. The operation matching component 12 includes a first part 121 with an opening. When a metal manual device 2 for manual adjustment is inserted into the opening, the coil 111 causes the manual device 2 to generate eddy currents, and the electromagnetic characteristics of the coil 111 change due to the eddy currents, thereby stopping the valve actuator 100 from operating.

[0038] It should be understood that valve actuators are used to control the opening degree of a valve or adjust its working position, including the open position, closed position, or an intermediate position between the two, through their actuating rods, thereby achieving flow regulation of the corresponding fluid. Alternatively, during the assembly stage of the valve actuator and the valve, the position of the valve actuator relative to the valve is adjusted by adjusting the position of the actuating rod. There are various types of valve actuators, such as those consisting of a controller, a three-phase or single-phase motor, and an optional mechanical transmission mechanism. The transmission mechanism is used to transmit the motor output to the actuating rod. The valve actuator and the valve seat are connected together through a valve stem or shaft, so that the actuating rod can drive the valve stem to move the valve seat within the valve body, thereby opening or closing the fluid flow passage within the valve body, achieving valve opening control, and ultimately regulating the flow rate of fluid (such as air or cooling water) through the valve opening. Mechanical transmission mechanisms, such as gear sets, involve one gear (e.g., a smaller gear) meshing with a gear on the output shaft of a motor to transmit power, while the larger gear is connected to an actuator rod, thereby converting the rotational motion of the larger gear into the linear motion of the actuator rod. The speed reduction effect is achieved due to the size differences in this series of gears. Therefore, such transmission mechanisms can also be called speed reduction mechanisms.

[0039] When adjusting the valve's operating position or the position of the valve actuator, a manual device is required to adjust the actuator's actuating rod. In this case, the valve actuator must be stopped, for example, its motor must cease operation, to ensure the safety and reliability of manual operation. In some designs, the manual device does not have the function of stopping the motor; the manual component disengages the gears before adjusting the actuator position. This type of actuator requires a complex gear-clutch mechanism. In other designs, Hall effect switches are used to detect manual signals to cut off motor drive control. However, in this design, the metal (such as a hex wrench) used to detect the manual signal by the Hall effect switch needs to be magnetic, thus limiting its applicability. If the magnetic wrench is lost, using a regular wrench will cause malfunction. Still other designs use optical sensors to detect manual signals and cut off motor drive control. However, optical sensors are susceptible to dust and other contaminants, which can cause them to fail to receive the switch signal, leading to malfunction in the field.

[0040] In contrast, this technical solution utilizes the eddy current effect to detect the insertion of a manual device into the opening of the operating matching component. This allows for timely and reliable sensing of changes in the electromagnetic characteristics of the detection component's coil, thereby controlling the valve actuator to stop operating. The specific control unit can be the valve actuator's built-in controller or an MCU (microcontroller), or a separately designed dedicated controller or its chip. Changes in the coil's electromagnetic characteristics can be measured through circuit design. Specifically, when a metal manual device (e.g., a wrench) is inserted into the detection component with a coil, an alternating current flowing through the coil generates an alternating magnetic field. According to Faraday's law of electromagnetic induction, the metal wrench (conductor) will generate an induced current in the changing magnetic field. This induced current flows in a closed loop within the metal, similar to a vortex in water, hence the name eddy current. The eddy current itself also generates a magnetic field, which interacts with the original magnetic field, thus affecting the coil's electromagnetic characteristics. These electromagnetic characteristics can include the coil's oscillation frequency (e.g., the frequency of the periodic change of current or voltage in the coil over time), magnetic flux, inductance, and other properties, all of which can change due to eddy currents. Therefore, the intervention of the manual device can be determined by the change in electromagnetic properties, thereby realizing automatic power-off, which facilitates subsequent position adjustment maintenance or installation and debugging operations.

[0041] Therefore, it is evident that the eddy current effect detection method only requires the manual device to be made of metal, thus exhibiting strong compatibility and wide applicability. Furthermore, this non-contact detection method reduces the risk of wear or even malfunction on the detection components or the manual device itself, ensuring a long service life, strong anti-interference capability, and high safety. In addition, the compact design of the detection components and operating matching parts results in a small size and high integration of the entire automatic power-off operating device, facilitating installation and use in valve actuators and other equipment. It is also understood that this disclosure does not impose any restrictions on the specific material of the manual device or the parameters of the coil. Those skilled in the art will understand that adjusting the conductivity and permeability of the metal wrench can affect the magnitude and intensity of the eddy current, thereby affecting the degree of change in the coil oscillation frequency, as well as the geometric parameters of the coil and the excitation current frequency, thus affecting the detection accuracy of the eddy current effect to obtain the required detection results. Furthermore, depending on the design, the manual device can be a separate component from the automatic power-off operating device, or it can be considered a component of the automatic power-off operating device. The detection components and operating matching parts can also be constructed as an integrated structure.

[0042] In some embodiments of this disclosure, the detection component 11 is configured with a winding post 112 and a sleeve portion 113, the coil 111 is wound on the winding post 112, the sleeve portion 113 is sleeved on the operation matching component 12, and the winding post 112 is disposed on one side of the sleeve portion 113.

[0043] This technical solution features a specially designed positional relationship between the winding post and the sleeve. The winding post's placement on one side of the sleeve allows for effective detection of the manual device without affecting its movement within the operating matching components, ensuring smooth subsequent maintenance of the manual device. Furthermore, the winding post design itself provides stable fixation and support for the coil, preventing loosening or deformation due to vibration or external forces during use. It also ensures uniform inter-turn spacing of the coil, thereby improving the uniformity and stability of the magnetic field.

[0044] This disclosure also recognizes that temperature affects the electromagnetic characteristics of a coil; for example, temperature affects the resistivity and inductance of the coil, causing the oscillation frequency of the coil to differ at different temperatures. To improve detection accuracy, in some embodiments, the automatic power-off operating device 1 further includes a controller, which includes a processing unit and an output unit. In response to a detected electromagnetic characteristic value exceeding a preset electromagnetic characteristic threshold, the processing unit sends a judgment command to the output unit, and the output unit, in response to the judgment command, outputs a control command to stop the valve actuator 100 from operating. The electromagnetic characteristic threshold can be pre-stored in any component of the valve actuator or controller, such as the processing unit.

[0045] It should be understood that the controller can be the valve actuator's own MCU or master controller, or a dedicated controller. The electromagnetic characteristic threshold can be an endpoint value or a range value, such as vibration frequency, magnetic flux, inductance value, or range. The controller's processing unit stores the coil's electromagnetic characteristic threshold and can detect electromagnetic characteristics in real time. When the detected value exceeds the threshold, it can respond quickly, achieving intelligent monitoring of the coil's state. This allows the valve actuator to be stopped promptly when a manual device enters the opening, ensuring safe maintenance.

[0046] Alternatively, the controller may include a data acquisition unit for acquiring the temperature of the coil 111, and the processing unit may set the electromagnetic characteristic threshold based on the temperature of the coil 111. Thus, this technical solution takes into account the influence of coil temperature, or ambient temperature, on detection accuracy, enabling the automatic power-off device to adapt to different temperature changes. Whether in high or low temperatures or other special environments, the device can maintain stable performance and accurate detection capabilities.

[0047] It should also be noted that this disclosure recognizes that the number of turns in a metal coil is fixed, and therefore its resistance is fixed. Consequently, the changes in electromagnetic properties caused by temperature, such as changes in oscillation frequency, are also fixed, or proportional. Based on this understanding, it is possible to measure the changes in electromagnetic properties at at least two different temperatures beforehand, and use this to set electromagnetic property thresholds, thereby obtaining the relationship between temperature and electromagnetic property thresholds. This allows for the derivation of electromagnetic property thresholds at any temperature in practical applications, ensuring detection accuracy.

[0048] The operation matching component 12 includes a second part 122, which is configured with a shape matching structure 1221. The manual device 2 operates by the first part 121 in a shape-matching manner with the shape matching structure 1221.

[0049] Therefore, in manual operation, the manual device first passes through the first part and then engages with the shape-matching structure. Upon passing through the first part, the coil can detect the intervention of the manual device and stop the valve actuator, ensuring the safe operation of the subsequent manual device and shape-matching structure. In this regard, the second part can be arranged downstream of the first part along the insertion direction of the manual device. It is also understood that, through shape matching, the rotational motion of the manual device can be directly and stably transmitted to the operating matching component, facilitating subsequent motion transmission, simplifying the operation process, and improving work efficiency. For example, the manual device is a hexagonal wrench, and correspondingly, the shape-matching structure has a hexagonal opening, which can effectively transmit motion. In addition, the cross-sections of the manual device and the shape-matching structure can also adopt other polygonal structures, or keyways or other concave-convex mating structures.

[0050] Figure 8 A perspective view of a load protection element according to the present disclosure is shown; Figure 9 A perspective view of a motion transmission element and clamping element according to the present disclosure is shown; and Figure 10 A cross-sectional view of a motion transmission element and clamp element according to the present disclosure is shown.

[0051] The automatic power-off operating device 1 includes a load protection component 13 and a motion transmission component 14 sleeved on the load protection component 13. The load protection component 13 and the motion transmission component 14 form a motion transmission engagement. The motion transmission component 14 is used to engage with the actuator rod of the valve actuator 100 (direct or indirect transmission engagement). The load protection component 13 includes a normal operating state and a protection state. In the normal operating state, the second part 122 transmits rotational motion to the load protection component 13. In the protection state, the second part 122 disengages from the load protection component 13.

[0052] According to this technical solution, when the manual device passes through the opening in the first part and matches the shape of the second part, the movement can be sequentially transmitted to the load protection member and the motion transmission member via the second part. Exemplarily, the motion transmission member then transmits the movement to the actuating rod via other transmission components, such as a gear assembly connected to the motion transmission member, thereby completing the position adjustment of the actuating rod.

[0053] This technical solution features a specially designed load protection mechanism. The load can be understood as the rotational torque of the operating matching component. In the event of an overload (e.g., when the valve body is already closed, manually operating the actuator to further close the valve causes the operating matching component to jam, resulting in an increase in rotational torque), i.e., in the protected state, the second part of the operating matching component disengages from the load protection component. Therefore, the movement of the second part of the operating matching component cannot be transmitted to the load protection component, which thus stops rotating. This stops the subsequent transmission of rotational motion, protecting the entire automatic power-off operating device and the actuator and other components involved in motion transmission from damage. Simultaneously, this design reduces the need for and cost of equipment maintenance, and improves the overall reliability and durability of the equipment.

[0054] Regarding the transmission relationship between the load protector and the motion transmission component, exemplarily, the lower end of the load protector is a square body 132, and the corresponding part of the motion transmission component is constructed as a rectangular opening 141, thereby achieving rotational motion transmission in a simple, stable, and efficient manner. Simultaneously, this fit also allows the load protector to shift relative to the rectangular opening between its normal operating state and its protected state, providing a dual function. Other polygonal structures or concave-convex fits are also feasible.

[0055] Regarding the specific method by which the load protection component disengages from the operating matching component under overload conditions, for example, the second part 122 is formed with a flange 1222, which engages with the motion transmission component 14. This engagement enhances the connection stability between the two, ensuring the structural integrity of the entire device.

[0056] In some embodiments of this disclosure, the second part 122, such as the flange 1222, is provided with a toothed structure 12221 (sometimes referred to as a planar gear) on the end face of the load protection member 13 facing the second part 122, such as the flange 1222. The load protection member 13 is provided with a groove 131 on the end face of the second part 122, such as the flange 1222. In the normal working state, the toothed structure 12221 engages with the groove 131. In the protected state, the toothed structure 12221 disengages from the groove 131.

[0057] This allows for convenient switching between normal operating and load protection states through the engagement and disengagement of the toothed structure and the groove. In this regard, the toothed structure can be constructed with inclined sides. Due to this side inclination, a lateral thrust exists during engagement, with a component along the longitudinal direction of the load protector. Under overload conditions, the lateral thrust increases, further amplifying this component, thereby pushing the load protector downwards (towards...). Figure 2 From a certain perspective, the toothed structure disengages, effectively preventing damage to components (such as gear assemblies) that may be caused by overload. In normal operation, the toothed structure engages within the groove. This tooth-groove fit provides precise positioning and stable motion transmission, ensuring that the rotational motion of the operating component is accurately transmitted to the load protection component, thus enabling the normal operation of the entire device. Therefore, the toothed structure and groove fit achieve the dual functions of motion transmission and overload protection. The toothed structure and groove can be directly constructed on the operating component and load protection component respectively, thus providing this dual function without adding extra burden to the entire device, maintaining its compactness.

[0058] Combination Figure 2 It can also be seen that the automatic power-off operating device 1 includes a spring 15, which abuts against the load protection member 13 and the motion transmission member 14 in its longitudinal direction. In the normal working state and the protection state, the spring 15 applies a spring force to the load protection member 13 in the direction toward the second part 122.

[0059] It should be noted that the spring also plays a dual role. In the protected state, when the load disappears or returns to normal, the spring applies an upward thrust to the load protection component, enabling the groove of the load protection component to re-engage with the toothed structure of the second part of the operating matching component, thereby achieving reset and restoring the transmission of motion, allowing the manual device to adjust its position. In the normal operating state, the spring still applies an upward thrust to the load protection component, which helps to enhance the connection stability between the load protection component and the operating matching component, preventing accidental disengagement due to vibration or external impact. Thus, the engagement force between the toothed structure and the groove can be set by the spring's thrust. This engagement force determines how much force is required to disengage the toothed structure and groove under overload conditions, i.e., determining the overload protection threshold. Those skilled in the art will understand that this threshold can be determined based on the requirements of the load limit and adjusted by designing the spring's stiffness coefficient, number, size, series / parallel arrangement, material, and shape (straight or conical spring). In addition, when the load is too large, the spring force will play a certain buffering role, absorbing some of the overload energy, thereby protecting the load protection components and the entire device from damage.

[0060] In some embodiments of this disclosure, the automatic power-off operating device 1 includes a clamping element 17, which is clamped to the outer peripheral surface of the motion transmission member 14.

[0061] In this regard, the clamp element is clamped onto the outer circumferential surface of the motion transmission component, which can tightly fix the motion transmission component and prevent it from loosening or shifting during operation. In particular, this design ensures that the motion transmission component has no outward elastic force, so it can only rotate during operation and cannot move, thus preventing the operating matching component from disengaging from the motion transmission component. The clamp element, together with the aforementioned snap-fit, can better stabilize the relative position of the operating matching component and the motion transmission component. Specifically, the clamp element can be constructed as a spring clamp, which has a certain degree of elasticity and self-adaptability, making it easier to adapt to motion transmission components of different diameters or shapes and ensuring a tight clamping effect.

[0062] Figure 11 A schematic diagram of a plug device according to the present disclosure mounted on a valve actuator is shown; and Figure 12 A schematic diagram of the assembly of a plug device and an operating matching component according to the present disclosure is shown.

[0063] The automatic power-off operating device 1 includes a plug device 16, which is sealed to the opening and is made of non-metallic material.

[0064] It should be understood that the plug device is used to block the opening of the operating matching component when the valve actuator or valve opening does not require manual adjustment, thereby achieving a dustproof and waterproof sealing function and protecting the internal components from damage. Here, the plug device is made of non-metallic material to prevent accidental triggering of the coil detection. Specifically, silicone material can be selected as the non-metallic material, which has excellent sealing performance, temperature resistance, corrosion resistance, chemical stability, and insulation properties, and is easy to process and mold, and is environmentally friendly and non-toxic. In addition, one end of the plug device is sealed to the opening, and the other end can be fixed to the valve actuator housing, for example, fitting into the receiving space of the valve actuator housing 3 and flush or substantially flush with the outer surface of the housing, so as to keep the overall appearance of the valve actuator neat and maintain sealing performance.

[0065] The sleeve portion 113 is equipped with a snap-fit ​​structure 1131, which is used to snap-fit ​​with the valve actuator 100, making the connection between the sleeve portion and the valve actuator simple, quick, and secure, and also easy to disassemble. Specifically, the valve actuator has a middle plate 4. One side of the middle plate, for example, the bottom surface, is provided with a gear transmission structure, including a gear structure connected to the motor output shaft for adjusting the position of the actuator rod and a gear structure connected to the automatic power-off operating device. The other side of the middle plate, for example, the top surface, is provided with the automatic power-off operating device. A support structure 41 is also constructed on the top surface of the middle plate, and the end of the support structure is provided with a hook for snap-fit ​​engagement with the through hole opened on the snap-fit ​​structure. In addition to snap-fit ​​connection, other connection methods such as threaded connection, welding connection, and bonding can also be used.

[0066] This disclosure also relates to a valve actuator 100, wherein the valve actuator 100 includes any of the aforementioned automatic power-off operating devices 1. Therefore, the valve actuator of this disclosure can inherit various embodiments and corresponding technical effects of the automatic power-off operating device, which will not be elaborated further here. It should be understood that the valve actuator is used, for example, to adjust the working position of an air valve or a water valve, and is used in an air conditioning system. The air conditioning system can be a heating, ventilation, and air conditioning (HVAC) system applied in a building automation system. In this application scenario, the valve is an air valve (regulating airflow) in the air conditioning system or a water valve for controlling temperature in a water-based system (e.g., installed in a cooling water circuit to regulate the flow of inlet or outlet water), controlled by an electric actuator, ultimately achieving temperature control through flow control.

[0067] It should be understood that all the above preferred embodiments are exemplary and not restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of this disclosure should be within the legal protection scope of this disclosure.

Claims

1. An automatic de-energizing operating device (1) for a valve actuator (100), characterized in that, The automatic power-off operating device (1) comprises a detection assembly (11) and an operating matching component (12), the detection assembly (11) is sleeved on the operating matching component (12), the detection assembly (11) comprises a coil (111) capable of passing current, the operating matching component (12) comprises a first part (121) with an opening, when a metal manual device (2) for manual adjustment is inserted into the opening, the coil (111) makes the manual device (2) generate eddy current, and the electromagnetic property of the coil (111) changes due to the eddy current, so that the valve actuator (100) stops running.

2. The automatic de-energization operating device (1) according to claim 1, characterized in that The detection assembly (11) is configured with a winding column (112) and a sleeve part (113), the coil (111) is wound on the winding column (112), the sleeve part (113) is sleeved on the operating matching component (12), and the winding column (112) is arranged on one side of the sleeve part (113).

3. The automatic de-energization operating device (1) according to claim 1, characterized in that The automatic power-off operating device (1) further comprises a controller, the controller comprises a processing part and an output part, the processing part sends a judgment instruction to the output part in response to the detection value of the electromagnetic property exceeding a preset electromagnetic property threshold value, and the output part outputs a control instruction for stopping the valve actuator (100) from running in response to the judgment instruction.

4. The automatic de-energization operating device (1) according to claim 3, characterized in that The controller comprises a collection part for collecting the temperature of the coil (111), and the processing part sets the electromagnetic property threshold value based on the temperature of the coil (111).

5. The automatic de-energization operating device (1) according to claim 1, characterized in that The operating matching component (12) comprises a second part (122), the second part (122) is configured with a shape matching structure (1221), and the manual device (2) acts on the shape matching structure (1221) in shape cooperation through the first part (121).

6. The automatic de-energization operating device (1) according to claim 5, characterized in that The automatic power-off operating device (1) comprises a load protection piece (13) and a motion transmission piece (14) sleeved on the load protection piece (13), the load protection piece (13) and the motion transmission piece (14) form a motion transmission cooperation, the motion transmission piece (14) is used for driving cooperation with an actuating rod of the valve actuator (100), the load protection piece (13) comprises a normal working state and a protection state, in the normal working state, the second part (122) transmits rotary motion to the load protection piece (13); in the protection state, the second part (122) is disengaged from the load protection piece (13).

7. The automatic de-energization operating device (1) according to claim 6, characterized in that The second part (122) is formed with a flange (1222), and the flange (1222) is clamped in cooperation with the motion transmission piece (14).

8. The automatic de-energization operating device (1) according to claim 6, characterized in that The second part (122) is configured with a tooth-shaped structure (12221) towards the end surface of the load protector (13), the load protector (13) is configured with a groove (131) towards the end surface of the second part (122), in the normal working state, the tooth-shaped structure (12221) is engaged into the groove (131), in the protection state, the tooth-shaped structure (12221) is disengaged from the groove (131).

9. The automatic de-energization operating device (1) according to claim 6, characterized in that The automatic power-off operating device (1) comprises a spring (15), the spring (15) abuts between the load protector (13) and the motion transmission member (14) along the longitudinal direction of the spring (15), in the normal working state and the protection state, the spring (15) applies a spring force to the load protector (13) in the direction of the second part (122).

10. The automatic de-energization operating device (1) according to claim 7, characterized in that The automatic power-off operating device (1) comprises a clamp element (17), the clamp element (17) is clamped on the outer circumferential surface of the motion transmission member (14).

11. The automatic de-energization operating device (1) according to claim 1, characterized in that The automatic power-off operating device (1) comprises a plug device (16), the plug device (16) is sealingly engaged into the opening, the plug device (16) is made of a non-metallic material.

12. The automatic de-energization operating device (1) according to claim 2, characterized in that The sleeve part (113) is configured with a buckle structure (1131), the buckle structure (1131) is used for buckling connection with the valve actuator (100).

13. The automatic de-energization operating device (1) according to claim 1, characterized in that The automatic power-off operating device (1) comprises the manual device (2).

14. A valve actuator (100) characterized by, The valve actuator (100) comprises the automatic power-off operating device (1) according to any one of claims 1 to 13.

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