Electric execution protection mechanism for device body in high temperature environment

Abstract

The utility model belongs to valve protection mechanism technical field relates to a kind of electric actuating protection mechanism under equipment ontology high-temperature environment, including electric head, the outer wrapping of electric head has metal heat insulation plate, electric head output shaft bottom is connected valve stem by heat insulation pad block, valve stem bottom passes through support and extends into valve body inside, support lower end is connected with valve body, the inside of valve body is provided with the gate that is driven by valve stem to open and close, sealing ring is arranged between gate and valve body inner wall.The utility model is combined by heat insulation and heat dissipation mode, breaks down the heat transfer of valve body to electric head, electric head is stably operated under safe temperature, improves the durability and reliability under harsh working conditions, prolongs service life.

Description

Technical Field

[0001] This utility model belongs to the technical field of valve protection mechanisms, specifically relating to an electrically operated protection mechanism for equipment body operating under high temperature conditions. Background Technology

[0002] The broadest definition of an actuator is a drive device that provides linear or rotary motion, utilizing some kind of driving energy and operating under the action of a control signal. Actuators use liquid, gas, electricity, or other energy sources and convert them into driving force through a motor, cylinder, or other device. The basic types include partial-turn, multi-turn, and linear-stroke actuators. Electric actuators are the driving components of valves, used in pipeline valves in petroleum, chemical, power, and metallurgical industries that operate continuously in high-temperature environments. Electric actuators integrate a motor, precision reducer, electronic control module, and functional components made of plastic. They have strict requirements for the operating environment temperature; the upper limit of long-term operating temperature should not exceed 60-80℃.

[0003] In practical field applications, the electric actuator is installed too close to the high-temperature valve body, and no heat insulation element is installed at the connection with the valve stem. Heat from the high-temperature valve body is conducted to the electric actuator's interior through the metal valve stem, creating a thermal bridge and causing a rapid rise in the actuator's internal temperature. Traditional insulation measures only target the valve body itself, neglecting the insulation protection of the electric actuator itself. The electric actuator's outer shell is exposed to high-temperature radiation and high-temperature air convection, exacerbating the temperature rise. Overheating causes insulation aging in the motor windings, performance drift and malfunctions in electronic components, lubricating oil dilution and coking, accelerated wear of the transmission mechanism, and deformation and embrittlement of plastic parts. Consequently, the actuator experiences frequent failures, control malfunctions, and a shortened service life. Existing solutions attempt to alleviate the problem by lengthening the valve stem, but the effect is limited. Lengthening the valve stem introduces stability issues and occupies a large amount of space.

[0004] There is an urgent need for an integrated protection solution that blocks conduction and isolates radiation while having temperature control capabilities to solve the problem of reliable operation of electric actuators in high-temperature environments. Therefore, a protective mechanism for electric actuators in high-temperature environments is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide an electric actuator protection mechanism for high-temperature environments of the equipment body, which has an effective protection capability combining active heat insulation and temperature control heat dissipation. It solves the problems of overheating damage, poor reliability and short lifespan of the equipment caused by the failure to effectively block the heat conduction path and the lack of heat preservation and cooling mechanisms in the actuator body in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an electric actuator protection mechanism for the equipment body under high temperature environment, including an electric head, the electric head is wrapped with a metal heat insulation plate, the bottom of the output shaft of the electric head is connected to a valve stem through a heat insulation pad, the bottom of the valve stem passes through a bracket and extends into the valve body, the lower end of the bracket is connected to the valve body, a gate plate that is opened and closed by the valve stem is provided inside the valve body, and a sealing ring is provided between the gate plate and the inner wall of the valve body.

[0007] Preferably, the valve stem is made of stainless steel, and the exposed portion of the valve stem between the heat insulation pad and the gate is ≥300mm in length.

[0008] Preferably, the bracket is made of cast steel, and the valve body is made of WCB carbon steel or stainless steel.

[0009] Preferably, the gate is made of 2Cr13 stainless steel and the sealing ring is made of polytetrafluoroethylene.

[0010] Preferably, a temperature sensor is embedded in the metal heat insulation plate.

[0011] Preferably, an axial fan is provided on the outside of the electric motor, and the axial fan is electrically connected to the temperature sensor.

[0012] Preferably, the heat insulation pad has a cylindrical structure, and the upper and lower end faces of the heat insulation pad are respectively provided with connecting holes that mate with the output shaft of the electric head and the top of the valve stem. The heat insulation pad is made of ceramic fiber.

[0013] Preferably, the top of the valve stem is connected to the heat insulation pad via a connecting sleeve, and the connecting sleeve and the valve stem are fastened together by threads. The connecting sleeve is made of stainless steel.

[0014] Preferably, a gap is left between the metal heat insulation plate and the electric head housing to form an annular heat dissipation air duct, and heat dissipation fins are provided on the surface of the metal heat insulation plate.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] 1. This utility model blocks the transfer of heat from the valve body to the electric actuator by combining heat insulation and heat dissipation. The electric actuator operates stably at a safe temperature, improving durability and reliability under harsh working conditions and extending service life.

[0017] 2. This utility model has an effective protection capability that combines active heat insulation and temperature control heat dissipation, which solves the problems of overheating damage, poor reliability and short lifespan caused by the lack of effective blocking of heat conduction paths and the lack of heat preservation and cooling mechanisms in the actuator body in the prior art. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram of an electrically driven protective mechanism for a device body operating under high-temperature conditions, according to one embodiment.

[0020] Figure 2 This is a partial structural diagram of the electric actuator protection mechanism of a device body under high temperature environment according to one embodiment;

[0021] In the above figures, 1. Electric motor, 2. Metal heat insulation plate, 3. Heat insulation pad, 4. Valve stem, 5. Bracket, 6. Valve body, 7. Gate, 8. Sealing ring, 9. Temperature sensor. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0024] Example 1, such as Figure 1-2 As shown, an electrically operated protective mechanism for high-temperature environments of the equipment body includes an electric head 1. The electric head 1 receives control signals and outputs torque or thrust to drive the valve stem 4 and the gate 7 to open and close the valve. The electric head 1 is externally wrapped with a metal heat insulation plate 2. The metal heat insulation plate 2 is used to isolate the external environment from heat radiation and high-temperature airflow, such as radiant heat from nearby high-temperature pipes or furnaces. The metal heat insulation plate 2 is made of bright stainless steel or aluminum plate, which reflects most of the radiant heat, providing a relatively low-temperature microenvironment for the internal components. The metal heat insulation plate 2 is designed as a detachable split structure, preferably a two-part structure, for convenient installation and maintenance.

[0025] The bottom of the output shaft of the electric actuator 1 is connected to the valve stem 4 via a heat insulation pad 3. The valve stem 4 transmits power, converting the rotational motion of the electric actuator 1 into the linear or rotational motion of the gate 7, thus opening or closing the valve. The heat insulation pad 3 blocks heat from being conducted from the valve body 6 to the electric actuator 1 through the conduction path. It is installed between the output shaft of the electric actuator 1 and the valve stem 4, physically disconnecting the thermal bridge formed by the direct metal connection. The bottom of the valve stem 4 passes through the bracket 5 and extends into the valve body 6. The lower end of the bracket 5 is connected to the valve body 6. The valve body 6 contains a gate 7 that is opened and closed by the valve stem 4. The bracket 5 supports and fixes the entire electric actuator. The valve body 6 is the fluid passage and the base for mounting the gate 7. A sealing ring 8 is provided between the gate 7 and the inner wall of the valve body 6. The gate 7 is the component that cuts off or connects the fluid, and the sealing ring 8 provides a seal.

[0026] The specific design of the aforementioned key components will be discussed in detail below:

[0027] The valve stem 4 is made of stainless steel, and the exposed portion of the valve stem 4 between the heat insulation pad 3 and the gate 7 has a length of ≥300mm. This extended exposed portion of the valve stem 4 acts like a heat dissipation rod, increasing the contact area with the air. This allows more heat to dissipate into the surrounding air during conduction, reducing the temperature transferred to the heat insulation pad 3. The stainless steel material ensures sufficient strength and resistance to oxidation and corrosion at high temperatures.

[0028] The bracket 5 is made of cast steel, and the valve body 6 is made of WCB carbon steel or stainless steel. The cast steel bracket 5 and the WCB carbon steel or stainless steel valve body 6 have high structural strength and high mechanical properties, allowing the valve to operate stably under high pressure and high temperature.

[0029] The gate 7 is made of 2Cr13 stainless steel, and the sealing ring 8 is made of polytetrafluoroethylene (PTFE). The 2Cr13 stainless steel gate 7 has good high-temperature strength, hardness, and certain corrosion resistance, while the PTFE sealing ring 8 has excellent chemical inertness and high-temperature resistance, with a long-term operating temperature up to 260℃. A reinforced sealing ring 8 is preferred, such as one filled with glass fiber, graphite, or incorporating a metal spring, to maintain better elastic resilience at high temperatures and prevent leakage.

[0030] A temperature sensor 9 is embedded in the metal heat insulation plate 2. The temperature sensor 9 monitors the temperature near the metal heat insulation plate 2 in real time.

[0031] An axial fan is externally mounted on the electric motor 1, and the axial fan is electrically connected to a temperature sensor 9. When the temperature sensor 9 detects that the temperature exceeds a preset threshold, the axial fan automatically starts to provide forced airflow for rapid cooling. It only starts when needed, avoiding continuous energy consumption and achieving on-demand protection. The temperature sensor 9 and the axial fan are automatically controlled via a simple temperature control switch or by connecting to a PLC. The axial fan is installed on the top or side of the metal heat insulation plate 2, with the airflow direction being outward to enhance air circulation.

[0032] The heat insulation pad 3 has a cylindrical structure. The upper and lower end faces of the heat insulation pad 3 are respectively provided with connecting holes that cooperate with the output shaft of the electric head 1 and the top of the valve stem 4. The heat insulation pad 3 is made of ceramic fiber.

[0033] The top of the valve stem 4 is connected to the heat insulation pad 3 via a connecting sleeve. The connecting sleeve and the valve stem 4 are fastened together by threads. The connecting sleeve is made of stainless steel. The connecting sleeve serves as a transitional component between the valve stem 4 and the heat insulation pad 3, simplifying the assembly structure of the heat insulation pad 3 and the valve stem 4. The valve stem 4 can be directly machined with external threads to fasten to the internal threads of the connecting sleeve, avoiding the need to directly machine threads on the brittle heat insulation pad 3. This allows it to bear the main tightening force and prevents damage to the heat insulation pad 3 due to excessive tightening.

[0034] A gap is left between the metal heat insulation plate 2 and the outer shell of the electric head 1 to form an annular heat dissipation air duct. The gap allows airflow, utilizing the chimney effect to remove heat from the surface of the electric head 1, thus enhancing heat dissipation. The surface of the metal heat insulation plate 2 is provided with heat dissipation fins. The heat dissipation fins increase the outer surface area of ​​the metal heat insulation plate 2, enhance its passive heat dissipation capacity, and dissipate heat into the air more quickly. At the same time, it can work in conjunction with the axial fan to improve the overall heat dissipation efficiency.

[0035] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A protective mechanism for electrically driven actuators operating under high-temperature conditions, comprising an electric drive, characterized in that, The electric motor is wrapped with a metal heat insulation plate. The bottom of the output shaft of the electric motor is connected to the valve stem through a heat insulation pad. The bottom of the valve stem passes through the bracket and extends into the valve body. The lower end of the bracket is connected to the valve body. The valve body is equipped with a gate that is opened and closed by the valve stem. A sealing ring is provided between the gate and the inner wall of the valve body.

2. The electric actuator protection mechanism for high-temperature environments of the equipment body according to claim 1, characterized in that, The valve stem is made of stainless steel, and the exposed portion of the valve stem between the heat insulation pad and the gate is ≥300mm in length.

3. The electric actuator protection mechanism for high-temperature environments of the equipment body according to claim 1, characterized in that, The bracket is made of cast steel, and the valve body is made of WCB carbon steel or stainless steel.

4. The electric actuator protection mechanism for high-temperature environments of the equipment body according to claim 1, characterized in that, The gate is made of 2Cr13 stainless steel, and the sealing ring is made of polytetrafluoroethylene.

5. The electric actuator protection mechanism for high-temperature environments of the equipment body according to claim 1, characterized in that, Temperature sensors are embedded in the metal heat insulation plate.

6. The electric actuator protection mechanism for high-temperature environments of the equipment body according to claim 5, characterized in that, An axial fan is installed on the outside of the electric motor, and the axial fan is electrically connected to a temperature sensor.

7. The electric actuator protection mechanism for high-temperature environments of the equipment body according to claim 1, characterized in that, The heat insulation pad has a cylindrical structure, and the upper and lower end faces of the heat insulation pad are respectively provided with connection holes that mate with the output shaft of the electric head and the top of the valve stem. The heat insulation pad is made of ceramic fiber.

8. The electric actuator protection mechanism for high-temperature environments of the equipment body according to claim 1 or 7, characterized in that, The top of the valve stem is connected to the heat insulation pad via a connecting sleeve. The connecting sleeve and the valve stem are fastened together by threads. The connecting sleeve is made of stainless steel.

9. The electric actuator protection mechanism for high-temperature environments of the equipment body according to claim 1, characterized in that, A gap is left between the metal heat insulation plate and the electric head housing to form an annular heat dissipation air duct, and heat dissipation fins are provided on the surface of the metal heat insulation plate.

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