Cable assembly

Abstract

The utility model discloses a cable assembly, the cable assembly is electrically connected with electrical equipment, the cable assembly comprises a cable and a cooling medium channel, the cooling medium channel surrounds the cable, and a heat transfer space is defined by the inner surface of the cooling medium channel and the outer surface of the cable. The cooling medium flows in the heat transfer space, and the environment temperature of the electrical equipment is higher than 200 DEG C. The cable assembly can be ensured to normally operate in a high-temperature environment, and after the cable assembly is connected with electrical equipment, electric signals of the electrical equipment can be effectively and stably transmitted, so that the requirements of safety production specifications are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field relates to a cable assembly. More specifically, it relates to a cable assembly applied to high temperature environment. BACKGROUND

[0002] Currently, commercially available cables that can cross high temperature areas are typically required to operate at 220 DEG C. But for higher temperature environments, such as above 220 DEG C, designers can avoid using any electrical equipment due to the lack of high temperature resistant cables. However, safety codes strongly recommend using some electrical equipment to monitor the on-site environment so as to respond to emergencies in time. For example, using a flame detector (such as a UV ultraviolet flame detector) to monitor the flame state when the burner in the furnace is running to ensure that the use of gas is safe and there is no danger of gas leakage or explosion.

[0003] In the prior art, various electrical devices that need fireproof performance in special environments such as metallurgy and petrochemical industry require that the high temperature resistant cable (wire) can work stably at 125 DEG C, 135 DEG C, 150 DEG C, 180 DEG C, 200 DEG C, 250 DEG C, 300 DEG C, 500 DEG C, 800 DEG C, 1000 DEG C or even higher temperature, and the normal signal or power transmission is not affected. The ordinary cable produces insulation aging and scorching phenomenon at high temperature, and the cable performance is destroyed.

[0004] For industrial environments equipped with combustion devices, ignition flames exist in the combustion chamber. Flame detectors are generally used to detect the presence or absence of ignition flames in the combustion chamber to prevent unwanted flame from disappearing. The flame detector is spaced apart from the combustion chamber, and a cable assembly extends between them. The cable assembly is configured to transmit the characteristics of the flame from the combustion chamber to the flame detector. Therefore, the material of the cable assembly needs to withstand relatively high temperatures related to the combustion process.

[0005] The flame detector is configured and positioned to generate a sensor signal indicating the presence or absence of a flame in the system. It can be any of a large number of known types of flame detectors. Ultraviolet flame detectors are one example suitable for this configuration. Ultraviolet flame detectors generate a voltage signal corresponding to the intensity level of ultraviolet radiation within a selected band. By evaluating the output signal, it can be inferred that there is a flame within the range of the detector. Often, ultraviolet flame detectors are used with automatic ignition devices. When it is determined that there is no flame, the automatic ignition device can be started without the need for manual ignition by an operator, which is safer.

[0006] A typical melting furnace for producing molten iron from a raw material such as a molten solid reduced iron, a steelmaking raw material, etc. is disclosed in US8506880B2. The melting furnace has a furnace body and a plurality of tapping holes provided through the furnace body at different positions in the height direction. A raw material iron source is charged into the furnace together with carbon material, etc., and an oxygen-containing gas is blown in. The carbon material is combusted to generate combustion heat, and the raw material iron source is melted by the combustion heat to produce molten iron and molten slag. The molten iron and the molten slag are intermittently taken out of the furnace in a state in which the furnace body is upright to produce the molten iron. However, in the event of a combustion interruption due to some kind of trouble, the molten iron and the molten slag are solidified and clog the passage from the forehearth to the taphole, and it takes a great deal of time and cost to recover. In particular, the temperature of the molten iron discharged at the initial stage is not negligible, and in the worst case, the molten iron can be solidified in the ladle.

[0007] For a steel plant, the tundish is an important connecting device between the ladle and the mold. Tundish metallurgy is an important process. The continuous casting tundish has the functions of storage, distribution of molten steel and realization of multi-heat continuous casting, can promote the floating and separation of inclusions in molten steel, uniform the temperature of molten steel, and further improve the quality of the casting blank, and ensure the smooth progress of continuous casting production. A typical tundish structure diagram is shown in Figure 1 If the temperature of the tundish is too low, the remaining molten steel in the tundish will partially solidify and cannot flow out. CN105081235A discloses a tundish temperature measuring device, which comprises a tundish cover, a fixing flange, a guide pipe, a temperature measuring probe and a temperature detector. The temperature measuring probe is connected to a lead wire, and the guide pipe passes through a through hole of the tundish cover and is connected to the tundish cover through the fixing flange. The temperature measuring probe is connected to the temperature detector. However, the temperature measuring probe does not have effective temperature protection, has a low service life, and needs manual positioning and detection, which has a high operation risk.

[0008] Even in tapping or slagging, the oxygen-containing gas is continuously supplied, and the combustion heat obtained by combustion of the carbon material and / or carbon in the molten iron can suppress the temperature decrease of the molten iron in the furnace. As the minimum temperature of the molten iron, the temperature decrease caused by the effects of the flowability at the time of tapping or slagging, the conveying mechanism and the time to reach the subsequent process needs to be maintained in the range of 1400°C to 1500°C. Utility model content

[0009] The general object of the present disclosure is to provide a cable assembly allowing the use of an electrical cable and of an electrical appliance in which it is electrically connected, in high temperature conditions, above 1000°C, even above 1200°C and even above 1400°C.

[0010] The first aspect of the present application provides a cable assembly, which is electrically connected to an electrical appliance, the cable assembly comprising:

[0011] a cable; and

[0012] a cooling medium channel surrounding the cable, an inner surface of the cooling medium channel and an outer surface of the cable defining a heat transfer space in which the cooling medium flows, wherein the ambient temperature of the electrical device is higher than 200℃.

[0013] Further, the ambient temperature of the electrical device is higher than 1000℃.

[0014] Further, a cable protection layer is located between the outer surface of the cable and the inner surface of the cooling medium channel in the heat transfer space, and the cable extends in the cable protection layer.

[0015] Further, the cable protection layer has a tubular form or a cylindrical form.

[0016] Further, the material of the cable protection layer is glass fiber or rock wool fiber.

[0017] Further, the material of the cable protection layer is polyvinyl chloride glass fiber.

[0018] Further, the wall thickness of the cable protection layer ranges from 0.5mm to 5mm.

[0019] Further, the cooling medium is air or inert gas.

[0020] Further, the cooling medium channel is surrounded by a cooling channel protection layer.

[0021] Further, the wall thickness of the cooling channel protection layer is greater than 3mm.

[0022] Further, the cable assembly further comprises a control unit and a valve system, the control unit adjusts the opening degree of the valve system through electrical connection to adjust the flow of the cooling medium.

[0023] Further, a temperature sensor is arranged to detect the temperature of the ambient area of the electrical device, and the temperature sensor is electrically connected to the control unit.

[0024] Compared with the prior art, the technical scheme provided by the present application has the following advantages:

[0025] The cable assembly in the present application can ensure normal operation in a high temperature environment, and after being connected with the electrical device, the electrical signal of the electrical device can be effectively and stably transmitted to meet the requirements of safety production specifications. BRIEF DESCRIPTION OF DRAWINGS

[0026] The advantages and spirits of the present application can be further understood through the following detailed description of the utility model and the accompanying drawings.

[0027] Figure 1 is a schematic view of the structure of a tundish in the prior art;

[0028] Figure 2 is a schematic view of the structure of a cable assembly and an electrical equipment working environment according to an embodiment of the present application;

[0029] Figure 3 is a schematic view of a cable assembly according to an embodiment of the present application.

[0030] In the figure: 101, 102, 103, 104 and 105 represent temperature measuring points respectively; 201 represents a cable, 202 represents a cable protection layer, 203 represents a cooling medium channel, 204 represents a cooling channel protection layer, 205 represents a fixing component, 206 represents an electrical equipment in a high temperature zone, 207 represents a temperature sensor, 208 represents a housing, 209 represents a control unit, 210 represents an electrical equipment in a low temperature zone, 211 represents a valve system, 212 represents a cooling medium supply device, and 213 represents a cooling medium discharge hole. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, the present application should not be construed as being limited to the embodiments described below, and the technical concept of the present application can be implemented in combination with other known technologies or other technologies having the same functions as those known technologies.

[0032] In the description of the following specific embodiments, directional words will be used for the purpose of clearly showing the structure and working manner, but the words “front”, “back”, “left”, “right”, “outer”, “inner”, “outward”, “inward”, “axial”, “radial” and the like should be understood as convenient words, and should not be understood as limiting words.

[0033] In the description of the following specific embodiments, it should be understood that the terms “length”, “width”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as a limitation on the present application. In addition, when a first structure is described as being positioned “above” or “below” a second structure, it should be understood to mean that the first structure is positioned further away or closer to the horizontal plane.

[0034] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be taken literally or to imply a sequence or order of importance, or a specific number of entities, but are to be interpreted as equivalent terms to one another, merely to distinguish one technology feature from another technology feature. Thus, features described as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise expressly specified. Similarly, the limiting language appearing in the present text, such as "one", is not intended to limit the quantity of the referenced feature, but rather to describe a feature that has not been previously described. Similarly, unless a specific quantity modifier is present before a noun, the text herein should be interpreted to include both singular and plural forms of the feature, i.e. the technology solution can include one or more of the feature. Similarly, the modifying language appearing before a number in the present text, such as "about", "approximately", etc. generally includes the number, and the specific meaning should be interpreted in light of the context.

[0035] It should be understood that in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0036] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connected", "connection", "fixed", and the like, should be construed broadly. For example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. "Fixedly connected" or "fixed connection" or "non-actively connected" is understood to mean the connection between two or more structural members is not configured to provide relative movement. An example of a fixed connection is a welded joint or a bolted joint, and in some cases a welded joint and a bolted joint. "Active connection" or "active" or "movable connection" is understood to mean the connection between two or more structural members that allows horizontal and / or vertical relative movement between the members under extreme dynamic loads. Such connections generally do not allow movement under static loads or general dynamic loads (e.g., as applied by light / medium wind).

[0037] In this specification, the terms "unit", "piece", "thing" and "module" mean a unit for processing at least one function and operation, and can be implemented by a hardware component or a software component and a combination thereof.

[0038] The terms "high pressure" and "medium pressure" mean that the high pressure is higher in value than the medium pressure, so the difference between the two can be relatively small.

[0039] The terms "high temperature" and "low temperature" mean that the high temperature is higher in value than the low temperature, so the difference between the two can be relatively small. Although as used herein, high temperature tends to mean 200°C or more, even 500°C or more, 800°C or more, 1000°C or more, 1200°C or more, 1400°C or more.

[0040] Unless clearly indicated to the contrary, each aspect or embodiment defined herein can be combined with any other aspect or embodiment or aspects or embodiments. In particular, any feature indicated as preferred or advantageous can be combined with any other feature or features indicated as preferred or advantageous.

[0041] Term Explanation

[0042] As used herein, the term "fuel" refers to a gaseous, liquid, or solid fuel that can be used interchangeably or in combination. If it is in gaseous form at least in part, it can be introduced directly into the burner. If it is in liquid or solid form, it is introduced in the vicinity of the burner. The gaseous fuel can be natural gas (mainly methane), propane, hydrogen, syngas, biogas, or any other hydrocarbon and / or sulfur and / or nitrogen containing compound. The solid or liquid fuel can be any compound in carbon and / or hydrocarbon and / or sulfur containing form. The skilled person can decide on the introduction of the gaseous, liquid, or solid fuel as required, and the present application is not intended to be limited in any way.

[0043] As used herein, the term "flame detector" refers to a device that detects a flame by detecting specific wavelengths of ultraviolet, infrared, and visible light emitted by the flame, among others, in combination with identifying the flicker frequency characteristic of the flame. For example, a typical detection process includes electromagnetic radiation energy indicative of a specific characteristic of the flame being transmitted from the flame through a viewing tube and into a sensor assembly. A lens focuses the electromagnetic radiation energy in the sensor assembly onto a photodiode. In response, the photodiode generates an electrical signal based on the intensity of the electromagnetic radiation energy. The electrical signal can be in the form of a photocurrent that is indicative of the specific characteristic of the flame, including but not limited to the presence or absence of a flame. By way of example, a commercially available KROM SCHRODER flame detector UVS10 operates in an ambient temperature range of -40 to +80°C.

[0044] The specific embodiments of the present application will now be described in detail with reference to the accompanying drawings. The same or similar elements in the drawings are generally represented by the same or similar reference numerals. Therefore, the description of one embodiment is incorporated into the other embodiments as appropriate, and the description of the common subject matter will not be repeated.

[0045] For example, a cable 201 with a diameter of 8 mm or 12 mm is used in a factory.

[0046] The skilled person can choose whether to configure a cable protection layer 202 depending on the ambient temperature. The cable protection layer is wrapped around the outer periphery of the cable 201. The cable protection layer 202 is made of a non-conductive material, including but not limited to a high-temperature resistant sleeve made of glass fiber or rock wool fiber. Preferably, the cable protection layer 202 in the present application can be made of a polyvinyl chloride glass fiber hose, and the cable is inserted into the polyvinyl chloride glass fiber hose sleeve formed.

[0047] The wall thickness of the cable protection layer 202 ranges from 0.5 mm to 5 mm.

[0048] Cooling medium channel 203 provides a flow path for cooling medium to reduce the ambient temperature around the cable and ensure normal signal transmission. Cooling medium channel 203 can directly surround the cable, with its inner surface and the cable's outer surface defining a heat transfer space. When the ambient temperature exceeds the cable's tolerance range, the cooling medium flows within this heat transfer space, carrying away excess heat. When the cable is surrounded by a cable sheath, the cooling medium channel 203 can be positioned around the outside of the sheath. Cooling medium channel 203 is made of a high-temperature resistant material. This high-temperature resistant material includes, for example, high-temperature resistant metals, ceramics, cermets, or any other combination thereof. High-temperature resistant metals include carbon steel, stainless steel, or other metal alloys. Cooling medium channel 203 is encased by a cooling channel protective layer 204. The diameter of cooling medium channel 203 can range from 15mm to 100mm.

[0049] The cooling channel protective layer 204 is used to protect the cooling medium channel 203 from high temperatures. The cooling channel protective layer 204 is made of a high-temperature resistant material, such as high-temperature resistant fibers made of ceramic fiber, rock wool fiber, or glass fiber. The minimum wall thickness of the cooling channel protective layer 204 is 3 mm.

[0050] In addition, such as Figure 3 As shown, the cooling channel protective layer 204 can be fixed and tied tightly with a fixing component (e.g., stainless steel wire) 205.

[0051] According to safety or production specifications, electrical equipment 206 in the high-temperature zone is a component requiring electrical connection within the high-temperature zone, such as a flame detector (UV flame detector). The flame detector can be used as a combustion signal transmission device. Electrical equipment 206 in the high-temperature zone is located closer to the ladle.

[0052] Temperature sensor 207 is used to detect the temperature of the ambient area surrounding the electrical equipment 206 in the high-temperature zone. Temperature sensor 207 can be a resistance temperature detector (RTD) or a thermocouple. Once temperature sensor 207 detects a temperature higher than a set value, for example, if the set temperature for normal operation of the electrical equipment is below 50°C, then a higher pressure (flow rate) is allowed to recirculate the cooling medium. This is achieved by adjusting the opening of valve system 211.

[0053] The housing 208 is used to protect the surrounding environment of the electrical equipment 206 in the high-temperature zone. Cooling medium discharge holes 213 are provided on the side wall of the housing.

[0054] The control unit 209 includes a programmable logic controller (PLC) designed to send control signals to and receive signals from the temperature sensor 207, valve system 211, and other units. The control unit 209 coordinates the overall operation of all electrically connected devices.

[0055] Low temperature zone electrical equipment 210 is a collective term including pressure detectors, flow detectors or speed detectors, such as pressure transmitters, pressure switches, flow meters, flow switches, speed transmitters and the like. It is used to detect changes in the pressure, flow or speed of the cooling medium in the cooling medium supply conduit.

[0056] Valve system 211 can be an automatic temperature regulating valve, which adjusts the opening degree in response to signals transmitted by control unit 209.

[0057] Cooling medium supply device 212 is a cooling medium source, which provides cooling medium. The cooling medium can be air or inert gas. If it is an environment sensitive to oxygen concentration, the cooling medium is preferably inert gas. At the cooling medium source, a pressure transmitter is used to detect and ensure the minimum pressure of the cooling medium recirculation.

[0058] The flow range of the cooling medium can be 5 Nm 3 / h to 500 Nm 3 / h. The pressure range of the cooling medium can be 3 KPa to 300 KPa.

[0059] Embodiment

[0060] The test was carried out at a user site where molten steel was stably produced. The high temperature zone of the working environment of the electric cable was 1300°C to 1500°C or even above. The purpose of installing this cable assembly was to protect the normal use of the UV flame detector facing the opening window of the combustion chamber.

[0061] The total length of the cable was about 20 meters, of which about 10 meters was in the high temperature zone and about 10 meters was in the low temperature zone. The cable was wrapped with a high temperature resistant sleeve. The assembled cable was placed in a DN15 (outer diameter about 21 mm, inner diameter about 15 mm) stainless steel pipe. The stainless steel pipe served as a cooling medium channel. A tee and a pipe cap were installed at the other end of the cooling medium channel. A hole was drilled in the pipe cap for inserting the cable. Cooling medium such as air was supplied by the tee and flowed into the cooling medium channel. The outside of the cooling medium channel was wrapped with a high temperature resistant ceramic fiber material with a thickness of 6 mm.

[0062] A pressure transmitter was installed on the output pipe of the cooling medium source to detect and ensure the pressure of the air circulation. Once the air supply pressure is lower than the set value of the pressure transmitter, the valve opening degree is increased to increase the pressure (flow) of the air circulation. Alternatively, once the temperature sensor 207 detects that the temperature of the high temperature zone electrical equipment 206 surrounding environment area is higher than the set value, the valve opening degree is also increased to increase the pressure (flow) of the air circulation.

[0063] The above user site is configured with four groups of UV flame detectors. Four groups of flame burners continuously heat the furnace to ensure that the tundish maintains a high temperature to store the heated molten steel for a short time. Two temperature measuring points are arranged on both sides of the four groups of burners, i.e. five temperature measuring points 101, 102, 103, 104 and 105 as shown in FIG. Figure 1

[0064] The operator recorded the following two sets of test results in Table 1 and Table 2 at different times. In Table 1, the total heating time is 5 hours and 5 minutes. There are temperature measuring points 1 to 5 in the ladle as shown in FIG. Figure 1 Even if the temperature in the ladle rises to the high temperature range, the UV flame detector can still work at its normal operating temperature. At the last test time point, the temperature is lower than the previous time point because the swing arm of the burner is lifted and the burner stops running immediately.

[0065] Table 1

[0066]

[0067]

[0068] Similarly, using the same configuration and method, the total heating time in Table 2 is 4 hours and 11 minutes.

[0069] Table 2

[0070]

[0071] From the above table, it can be seen that the cable assembly effectively solves the problem that the cable is easily damaged in a high temperature environment, thereby ensuring the normal operation of the electrical equipment and better meeting the requirements of safe production.

[0072] The above description is only the preferred embodiments of the present application, and the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application. Any technical solution obtained by logical analysis, reasoning or limited experiments based on the concept of the present application should be within the scope of the present application.​

Claims

1. A cable assembly for electrically connecting an electrical device, the cable assembly comprising: The cable assembly comprises: a cable; and a cooling medium channel surrounding the cable, an inner surface of the cooling medium channel and an outer surface of the cable defining a heat transfer space in which the cooling medium flows, wherein the ambient temperature of the electrical device is higher than 200°C.

2. The cable assembly of claim 1, wherein, The ambient temperature of the electrical device is higher than 1000°C.

3. The cable assembly of claim 1 or 2, wherein, A cable protection layer is located between the outer surface of the cable and the inner surface of the cooling medium channel in the heat transfer space, and the cable extends in the cable protection layer.

4. The cable assembly of claim 3, wherein, The cable protection layer has a tubular form or a cylindrical form.

5. The cable assembly of claim 3, wherein, The material of the cable protection layer is glass fiber or rock wool fiber.

6. The cable assembly of claim 5, wherein, The material of the cable protection layer is polyvinyl chloride glass fiber.

7. The cable assembly of claim 3, wherein, The wall thickness of the cable protection layer ranges from 0.5mm to 5mm.

8. The cable assembly of claims 1 or 2, wherein, The cooling medium is air or inert gas.

9. The cable assembly of claims 1 or 2, wherein, The outer periphery of the cooling medium channel is surrounded by a cooling channel protection layer.

10. The cable assembly of claim 9, wherein, The wall thickness of the cooling channel protection layer is greater than 3mm.

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