Temperature measuring device and temperature measuring system

Abstract

The application provides a temperature measuring device and a temperature measuring system. The temperature measuring device comprises a shell and an optical cable. The optical cable comprises a first optical fiber, a second optical fiber and a middle protective sleeve. A first middle section of the first optical fiber and a second middle section of the second optical fiber are located in the middle protective sleeve, a first upper section of the first optical fiber and a second upper section of the second optical fiber are located on a first side of the middle protective sleeve, and a first lower section of the first optical fiber and a second lower section of the second optical fiber are located on a second side of the middle protective sleeve opposite to the first side. The first lower section and the second lower section are electrically connected and located in a receiving cavity of the shell. The temperature measuring device comprises the optical cable, has high measurement accuracy, and is a passive sensor, so that potential safety hazards can be avoided. The first optical fiber and the second optical fiber of the optical cable are electrically connected into one optical fiber, the length of the optical fiber after wiring is increased by fully utilizing the length of the first optical fiber and the second optical fiber of the optical cable, the use length of the optical cable is shortened, and the production complexity and the on-site construction difficulty are reduced on the premise of ensuring the cost.

Description

Technical Field

[0001] This application relates to the field of temperature measuring devices, and more particularly to temperature measuring devices and temperature measuring systems. Background Technology

[0002] As is well known, the key to successful grain storage is maintaining the temperature of the grain silo within a certain range. Therefore, monitoring the temperature of grain silos is essential. Currently, most temperature monitoring devices use temperature-sensing cables as conventional measuring devices. However, these cables are active devices and contain built-in temperature-sensing resistors, resulting in point-based temperature measurement that is not comprehensive enough for the grain silo and leads to poor monitoring performance. Utility Model Content

[0003] This application provides a temperature measuring device and system with better temperature measurement effect.

[0004] This application provides a temperature measuring device, including a housing and an optical cable. The housing has a receiving cavity. The optical cable includes a first optical fiber, a second optical fiber, and a middle protective sleeve. The first optical fiber includes a first upper section, a first middle section, and a first lower section. The second optical fiber includes a second upper section, a second middle section, and a second lower section. The first middle section and the second middle section are located inside the middle protective sleeve. The first upper section and the second upper section are located on a first side of the middle protective sleeve. The first lower section and the second lower section are located on a second side of the middle protective sleeve. The first side and the second side are opposite to each other. The first lower section and the second lower section are electrically connected and both are located inside the receiving cavity. At least a portion of the first upper section and at least a portion of the second upper section are located outside the housing.

[0005] Furthermore, the first lower segment and the second lower segment are arranged along the edge of the receiving cavity; and / or, The first lower segment and the second lower segment are fixed to the outer casing; and / or, The receiving cavity is elongated elliptical, and the radius of the semicircle at the end of the elongated ellipse is greater than or equal to 25 mm.

[0006] Furthermore, the first lower segment and the second lower segment are fused together and fixed, and the optical cable includes a sleeve to cover the fused connection between the first lower segment and the second lower segment; or, The first lower section and the second lower section are fixed together by a flange.

[0007] Furthermore, the outer shell is provided with a first groove, and one end of the middle protective sleeve is located in the first groove. Along the direction from the first upper section to the first lower section, the middle protective sleeve abuts against the outer shell.

[0008] Further, the outer casing includes a first outer casing and a second outer casing fixed to the first outer casing, the first outer casing and the second outer casing being disposed along the thickness direction of the temperature measuring device, and the first outer casing and the second outer casing forming the receiving cavity; or, The outer casing includes a first outer casing and a second outer casing fixed to the first outer casing. The first outer casing and the second outer casing are arranged along the length direction of the temperature measuring device and form the receiving cavity. The temperature measuring device includes a U-shaped tube, which is sleeved at the bend after the first lower section and the second lower section are connected.

[0009] Furthermore, the temperature measuring device includes a steel wire rope, which is fixed to at least one of the middle protective sleeve and the outer shell. The steel wire rope includes a hook, the end of which protrudes from the outer shell.

[0010] Furthermore, the wire rope includes a fixed section fixed to the middle protective sleeve and an extension section connected to the fixed section. The extension section includes a main body section located within the receiving cavity, and the hook is connected to the main body section.

[0011] Furthermore, the end of the extension is bent to form the hook, the temperature measuring device includes a fixing member to fix the free end of the hook to the main body section, the outer shell is provided with a second groove, the fixing member is located in the second groove, and along the direction from the first upper section to the first lower section, the fixing member abuts against the outer shell; and / or, The outer casing includes a protrusion extending into the receiving cavity, the protrusion being located in the center of the receiving cavity, and the protrusion having a groove to receive the wire rope; and / or, The optical cable includes the steel wire rope, the fixed section is located inside the middle protective sleeve, and after the lower protective sleeve is removed, the first lower section, the second lower section and the extension section of the steel wire rope are exposed.

[0012] Furthermore, the steel wire rope and the outer shell are injection molded together.

[0013] This application provides a temperature measurement system, including a host and a plurality of temperature measuring devices. The plurality of temperature measuring devices are connected in series through a plurality of first upper sections and a plurality of second upper sections. The first upper section or the second upper section of two temperature measuring devices located at both ends are electrically connected to the host.

[0014] The temperature measuring device of this application includes an optical cable. Utilizing optical fiber temperature measurement not only provides high measurement accuracy, but the optical cable is also a passive sensor, avoiding potential safety hazards. The first and second optical fibers of the optical cable are electrically connected to form a single optical fiber. Compared to using the entire first or second optical fiber of the optical cable for cabling, this fully utilizes the length of the first and second optical fibers to increase the length of the fiber after cabling, shortening the total length of the optical cable. This reduces production complexity and on-site construction difficulty while ensuring cost control. Furthermore, the outer casing protects the connection between the first and second optical fibers to prevent disconnection and abnormal temperature detection. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a temperature measuring device according to an embodiment of the present application, wherein the first upper section of the first optical fiber and the second upper section of the second optical fiber are shown. Figure 2 yes Figure 1 An exploded view of the temperature measuring device shown. Figure 3 yes Figure 2 The diagram shown is a schematic of the steel wire rope after it has been fixed to the second outer shell. Figure 4 yes Figure 1 The schematic diagram of the temperature measuring device shown is not shown, in which the first upper section of the first optical fiber and the second upper section of the second optical fiber are not shown. Figure 5 yes Figure 1 The diagram shows the temperature measuring device in conjunction with the probe tool. Figure 6 yes Figure 2 The diagram shown is of the optical cable before stripping. Figure 7 yes Figure 6 The diagram shown is a schematic of the optical cable after the upper protective sleeve has been removed. Figure 8 yes Figure 7 The diagram shown is a schematic of the optical cable after the lower protective sleeve has been removed. Figure 9 yes Figure 8 The diagram shows the electrical connection between the first lower segment of the first optical fiber and the second lower segment of the second optical fiber. Figure 10 yes Figure 1 A schematic diagram of another embodiment of the temperature measuring device is shown, wherein the first upper section of the first optical fiber and the second upper section of the second optical fiber are not shown. Figure 11 yes Figure 10 An exploded view of the temperature measuring device is shown, in which the first upper segment of the first optical fiber and the second upper segment of the second optical fiber are not shown. Figure 12 yes Figure 1is an exploded view of yet another embodiment of the temperature measuring device shown, in which the first upper section of the first optical fiber and the second upper section of the second optical fiber are not shown; Figure 13 is Figure 12 is a schematic view of the temperature measuring device shown with the first housing removed, in which the first upper section of the first optical fiber and the second upper section of the second optical fiber are not shown; Figure 14 is a schematic view of a plurality of Figure 1 the temperature measuring devices shown connected in series and arranged in a grain barn. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments (or referred to as "implementations") of the present application will be clearly and completely described below with reference to the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements.

[0017] If the embodiments of the present application involve terms indicating directional indications or positional relationships (such as up, down, left, right, front, rear, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement conditions, etc. between components under a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will change accordingly. In addition, the terms "first", "second" and the like involved in the embodiments of the present application are only for the purpose of facilitating description, and cannot be construed as indicating or implying relative importance.

[0018] referring Figures 1 to 2 , the temperature measuring device 100 according to the embodiment of the present application includes a housing 1 and an optical cable 2. The housing 1 is provided with a receiving cavity 141. The optical cable 2 includes a first optical fiber 21, a second optical fiber 22 and an intermediate protective sleeve 23. The first optical fiber 21 includes a first upper section 211, a first middle section (not shown) and a first lower section 213. The second optical fiber 22 includes a second upper section 221, a second middle section (not shown) and a second lower section 223. The first middle section and the second middle section are located inside the intermediate protective sleeve 23. The first upper section 211 and the second upper section 221 are located on the first side of the intermediate protective sleeve 23. The first lower section 213 and the second lower section 223 are located on the second side of the intermediate protective sleeve 23. The first side and the second side are disposed opposite to each other. In Figure 3 , the first side is the upper side of the intermediate protective sleeve 23, and the second side is the lower side of the intermediate protective sleeve 23.

[0019] The first lower section 213 and the second lower section 223 are electrically connected and both located in the receiving cavity 141, and at least part of the first upper section 211 and at least part of the second upper section 221 are located outside the housing 1, so as to facilitate the series connection of a plurality of temperature measuring devices 100.

[0020] The temperature measuring device 100 according to the embodiments of the present application uses the optical cable 2 for temperature measurement, which breaks through the bottlenecks of traditional temperature-sensing cables and optical fiber temperature measurement, solves the problem of point-type temperature measurement, and has high measurement accuracy; moreover, the optical cable 2 is a passive sensor, which can avoid potential safety hazards.

[0021] The first optical fiber 21 and the second optical fiber 22 of the optical cable 2 of the temperature measuring device 100 according to the embodiments of the present application are electrically connected to form a single optical fiber. Compared with wiring using the entire first optical fiber 21 or the entire second optical fiber 22 of the optical cable 2, the lengths of the first optical fiber 21 and the second optical fiber 22 of the optical cable 2 are fully utilized to increase the length of the wired optical fiber, which shortens the total usage length of the optical cable 2, and reduces the complexity of production and the difficulty of on-site construction on the premise of ensuring the cost. For example, if the length of the first optical fiber 21 and the second optical fiber 22 after connection is 2 meters, only 1 meter of the optical cable 2 is used. If wiring is performed using the entire optical cable 2, 2 meters of the optical cable 2 are required. Obviously, the temperature measuring device 100 of the present application shortens the total usage length of the optical cable 2.

[0022] The housing 1 of the temperature measuring device 100 according to the embodiments of the present application can protect the connection between the first optical fiber 21 and the second optical fiber 22, so as to avoid abnormal temperature detection caused by disconnection; the arrangement of the housing 1 enables the temperature measuring device 100 to be inserted downward during use, which is suitable for the retrofitting scenario of the temperature measuring device 100. The position and quantity of the temperature measuring device 100 can be arbitrarily changed according to usage requirements, and the temperature measuring device 100 is also convenient to replace, making the use more flexible; at the same time, the temperature measuring device 100 is arranged in a modular manner, which is more convenient for arrangement during use. The temperature measuring device 100 can also be applied in the pre-installation scenario.

[0023] The retrofitting scenario refers to that the temperature measuring device 100 is inserted downward into the interior of the grain pile, and the pre-installation scenario refers to that the temperature measuring device 100 is arranged in advance and then the grain is put in. Inserting downward refers to moving from top to bottom, for example, the temperature measuring device 100 moves from above the grain pile to the interior of the grain pile.

[0024] The temperature measuring device 100 according to the embodiments of the present application can be applied in a grain barn to monitor the temperature of grain, cereals or flour in real time, and upload the temperature measurement data to a host for data processing, and the health status of the grain barn is determined by judging whether the temperature in the entire grain barn meets the requirements.

[0025] In one embodiment, at least part of the protective sleeve 23 is located outside the housing 1, so that the volume of the housing 1 is small, which is beneficial to the miniaturization of the temperature measuring device 100 and reduces the insertion resistance during downward insertion.

[0026] Ref Figure 3In one embodiment, the first lower segment 213 and the second lower segment 223 are connected and coiled within the receiving cavity 141. The first lower segment 213 and the second lower segment 223 are arranged along the edge of the receiving cavity 141, and the bending radius of the first lower segment 213 and the second lower segment 223 after being connected and arranged within the receiving cavity 141 is maximized. The larger the bending radius, the lower the optical loss and the more accurate the measurement results.

[0027] In one embodiment, the receiving cavity 141 is elongated ellipse, and the radius of the semicircle at the end of the elongated ellipse is greater than or equal to 25 mm, ensuring that the bending radius is ≥25 mm, so as to minimize light loss and improve the accuracy of measurement results.

[0028] In one embodiment, the first lower segment 213 and the second lower segment 223 are fixed to the outer casing 1 to prevent the first lower segment 213 and the second lower segment 223 from moving, so as to prevent breakage or disconnection of the connection and cause abnormal temperature detection.

[0029] In one embodiment, the first lower section 213 and the second lower section 223 after fiber coiling are fixed in the receiving cavity 141 by adhesive, snap-fit ​​or potting.

[0030] In one embodiment, the first lower segment 213 and the second lower segment 223 are fixed by fiber splicing. The loss at the fiber splicing position is approximately 0.1dB, which provides a permanent connection with lower loss, higher reliability and longer life, without increasing the space occupied. This is beneficial for the miniaturization of the temperature measuring device 100, so as to reduce the resistance during downward movement and facilitate downward movement.

[0031] Fiber fusion splicing, also known as optical fiber fusion, is a technique that fuses the ends of two optical fibers together at high temperatures to achieve continuous optical signal transmission. In one implementation, fusion splicing utilizes the high temperature (approximately 2000°C) generated by a high-voltage electric arc discharge to rapidly melt the end faces of the two optical fibers, fusing them together under surface tension. After cooling, a strong, low-loss connection is formed. The fusion splicer uses a high-precision optical system to precisely align the cores of the two optical fibers (three-dimensional alignment along the X and Y axes), then applies an electric arc while simultaneously using precision mechanical devices to smoothly advance the fibers, ensuring the quality of the splice.

[0032] In another embodiment, the first lower section 213 and the second lower section 223 are fixed by a flange connection. Compared with fiber optic welding, the loss is relatively large, and the flange head occupies a large space, which will increase the volume of the temperature measuring device 100 and is not conducive to downward probe.

[0033] In one embodiment, the optical cable 2 includes a sleeve 24 to cover the fusion splice joint between the first lower segment 213 and the second lower segment 223, thereby increasing the strength of the fusion splice joint between the first lower segment 213 and the second lower segment 223 to prevent breakage at this point and thus prevent abnormal temperature detection.

[0034] In one embodiment, the sleeve 24 is a heat-shrinkable sleeve, which is more convenient to use.

[0035] Before fiber fusion splicing of the first lower section 213 and the second lower section 223, the sleeve 24 is sleeved onto the first lower section 213 or the second lower section 223. After the first lower section 213 and the second lower section 223 are fixed by fiber fusion splicing, the sleeve 24 is moved to the fiber fusion splicing joint and subjected to heat shrinkage, so as to ensure the strength of the fusion spliced part and prevent disconnection.

[0036] In one embodiment, the housing 1 is provided with a first groove 142, one end of the middle protective sleeve 23 is located in the first groove 142, and the middle protective sleeve 23 abuts against the housing 1 along the direction from the first upper section 211 to the first lower section 213. During the downward probing process of the temperature measuring device 100, the optical cable 2 is ensured not to move relative to the housing 1, so as to protect the first optical fiber 21 and the second optical fiber 22 and prevent breakage.

[0037] In one embodiment, one end of the middle protective sleeve 23 is in tight fit with the first groove 142, which can prevent the middle protective sleeve 23 from shaking.

[0038] Reference Figures 1 to 5 , in one embodiment, the temperature measuring device 100 includes a steel wire rope 3. The steel wire rope 3 includes a fixing section (not shown) fixed to the middle protective sleeve 23 and an extension section 32 connected to the fixing section. Along the direction from the first upper section 211 to the first lower section 213, the extension section 32, the first lower section 213 and the second lower section 223 are located on the same side of the middle protective sleeve 23. The extension section 32 includes a main body section 321 located in the accommodating cavity 141 and a hook portion 322 connected to the main body section 321. The end of the hook portion 322 protrudes out of the housing 1 for abutting against the downward probing tool 200, and the downward probing tool 200 carries the temperature measuring device 100 to probe down to the position where temperature measurement is required.

[0039] The arrangement of the steel wire rope 3 not only facilitates the downward probing of the temperature measuring device 100, but also serves as a force-bearing point during the downward probing process, so as to ensure that the optical cable 2 is not subjected to force during the downward probing process and protect the optical cable 2. When the temperature measuring device 100 can also be applied in a pre-installation scenario, the hook portion 322 can be hooked from below to facilitate fixing the temperature measuring device 100.

[0040] In one embodiment, the end of the extension section 32 is bent to form the hook portion 322. The temperature measuring device 100 includes a fixing member 4 to fix the free end of the hook portion 322 and the main body section 321. The hook portion 322 is in a closed ring shape, which not only facilitates the matching between the temperature measuring device 100 and the downward probing tool 200, but also prevents the two from accidentally disengaging during the downward probing process, so as to ensure that the temperature measuring device 100 probes down to the preset position.

[0041] In one embodiment, the lowering tool 200 includes a rod-shaped portion 201 and a crimping portion 202 extending obliquely from the rod-shaped portion 201. During lowering, the crimping portion 202 passes into the space formed by the hook portion 322 and crimps onto the hook portion 322. When downward pressure is applied to the rod-shaped portion 201, the crimping portion 202 applies a crimping force to the hook portion 322 to lower the temperature measuring device 100.

[0042] In one embodiment, the outer casing 1 is provided with a second groove 143. The fixing member 4 is located within the second groove 143. Along the direction from the first upper section 211 to the first lower section 213, the fixing member 4 abuts against the outer casing 1. During the downward movement of the temperature measuring device 100, it is ensured that the outer casing 1 will not move relative to the steel wire rope 3 and the optical cable 2 will not move relative to the outer casing 1, so as to protect the fusion splice between the first optical fiber 21 and the second optical fiber 22 and prevent disconnection.

[0043] In one embodiment, the fastener 4 is fixed to the outer casing 1 by means of welding, bonding or tight fitting, which is more effective in preventing the outer casing 1 from moving relative to the wire rope 3 and the optical cable 2 from moving relative to the outer casing 1.

[0044] In one embodiment, the housing 1 includes a protrusion 144 extending into the receiving cavity 141. The protrusion 144 is located at the center of the receiving cavity 141. The protrusion 144 is provided with a groove 1441 to receive a portion of the wire rope 3, which ensures that the wire rope 3 does not sway relative to the housing 1 and ensures a balanced downward force.

[0045] In one embodiment, the wire rope 3 is tightly fitted with the groove 1441, which further improves the effect of preventing the wire rope 3 from swaying.

[0046] In one embodiment, the wire rope 3 is located in the center of the receiving cavity 141 along the width direction W of the outer shell 1 to ensure that the temperature measuring device 100 is subjected to balanced force.

[0047] In one embodiment, the housing 1 is made of metal to ensure its strength and extend its service life. In another embodiment, the housing 1 is made of stainless steel to prevent rust and ensure its strength.

[0048] In one embodiment, the entire housing 1 is elongated, comprising an insertion portion 11 and a top portion 12. Along the length direction L of the housing 1, the insertion portion 11 and the top portion 12 are arranged opposite to each other. The first groove 142 is disposed on the top portion 12, and the second groove 143 is disposed on the insertion portion 11. At least part of the first upper section 211 and at least part of the second upper section 221 protrude out of the top portion 12 of the housing 1 to be exposed outside the housing 1. The middle protective sleeve 23 protrudes from the top portion 12. The end of the hook portion 322 protrudes from the insertion portion 11. The direction from the first upper section 211 to the first lower section 213 is the same as the direction from the top portion 12 to the insertion portion 11. The insertion portion 11 is in a sharp nozzle shape, which can not only reduce the resistance generated by the housing 1 during the downward probing process, but also play a guiding and traction role during the downward probing process to facilitate downward probing.

[0049] Reference Figures 6 to 9 , in one embodiment, the optical cable 2 includes a steel wire rope 3, that is, the steel wire rope 3 is a part of the optical cable 2, which enhances the mechanical strength of the optical cable 2 and prevents the first optical fiber 21 and the second optical fiber 22 from breaking. The fixing section is located inside the middle protective sleeve 23. After removing the upper protective sleeve 25 from the optical cable 2, the first upper section 211 and the second upper section 221 are exposed. After removing the lower protective sleeve 26 from the optical cable 2, the first lower section 213, the second lower section 223 and the extension section 32 of the steel wire rope 3 are exposed. The first lower section 213 and the second lower section 223 are fixed and then sleeved with the sleeve 24. The middle protective sleeve 23 is located between the upper protective sleeve and the lower protective sleeve. A part of the steel wire rope 3 exposed after removing the upper protective sleeve can be cut off. In one embodiment, the cut end can be knotted to increase the stability of the steel wire rope 3. Using the steel wire rope 3 of the optical cable 2 itself, there is no need to add an additional steel wire rope 3, which not only saves the process of fixing the steel wire rope 3, but also increases the stability of the steel wire rope 3.

[0050] In another embodiment, the optical cable 2 does not include the upper protective sleeve 25, the first upper section 211 and the second upper section 221 are located above the middle protective sleeve 23, and after removing the lower protective sleeve 26 from the optical cable 2, the first lower section 213, the second lower section 223 and the extension section 32 of the steel wire rope 3 are exposed.

[0051] The lower protective sleeve 26 is stripped from the bottom of the optical cable 2 to expose the first lower section 213, the second lower section 223 and the extension section 32 of the steel wire rope 3, and the lengths of the first lower section 213, the second lower section 223 and the extension section 32 of the steel wire rope 3 are strongly related to factors such as processes. Since downward probing starts from the bottom of the temperature measuring device 100, and the force-bearing point of the steel wire rope 3 is also at the bottom of the temperature measuring device 100, stripping the bottom can facilitate using the structure of the steel wire rope 3 of the optical cable 2 to process it into the hook portion 322, so as to cooperate with the downward probing tool 200 to facilitate downward probing.

[0052] In one embodiment, the optical cable 2 includes a reinforcing layer 27 covering the outer sides of the first optical fiber 21, the second optical fiber 22 and the steel wire rope 3, and a steel strand 28 located on the outer side of the reinforcing layer 27.

[0053] In another embodiment, the optical cable 2 may also not include the steel wire rope 3, and the separately arranged steel wire rope 3 only needs to be fixed to the optical cable 2. The steel wire rope 3 may be located below the middle protective sleeve 23, with its fixing section connected and fixed to the middle protective sleeve 23, or the fixing section of the steel wire rope 3 is located on the outer side of the middle protective sleeve 23 and fixed to the middle protective sleeve 23.

[0054] In one embodiment, the housing 1 includes a first housing 13 and a second housing 14, so as to facilitate the processing, molding and assembly of the optical cable 2. The first housing 13 and the second housing 14 are fixed by screws 15, which facilitates the assembly and disassembly of the housing 1. The first housing 13 and the second housing 14 may also be fixed by means of snapping, welding, bonding or the like.

[0055] See Figure 4 , the first housing 13 and the second housing 14 are arranged along the thickness direction D of the temperature measuring device 100. The optical cable 2 may be fixed to the second housing 14 first, and then the first housing 13 and the second housing 14 are fixed. The states of the first lower section 213 and the second lower section 223 in the accommodating cavity 141 can be visually observed, so as to prevent breakage or extrusion and avoid temperature measurement failure of the temperature measuring device 100.

[0056] The accommodating cavity 141 may be entirely disposed in the first housing 13 or the second housing 14, or partially disposed in the first housing 13 and partially disposed in the second housing 14. The first groove 142 may be entirely disposed in the first housing 13 or the second housing 14, or partially disposed in the first housing 13 and partially disposed in the second housing 14. The second groove 143 may be entirely disposed in the first housing 13 or the second housing 14, or partially disposed in the first housing 13 and partially disposed in the second housing 14. The protruding block 144 may be disposed on one of the first housing 13 and the second housing 14, or the protruding blocks 144 may be disposed on both of them.

[0057] See Figures 10 to 11 , in another embodiment, the first housing 13 and the second housing 14 are arranged along the length direction L of the housing 1. The insertion portion 11 is disposed on the first housing 13, and the top portion 12 is disposed on the second housing 14. The first housing 13 and the second housing 14 may be fixed by threaded connection, or may be fixed by means of screw locking, welding, bonding or the like.

[0058] The housing 1 is in a cylindrical shape, and the insertion portion 11 is in a sharp nozzle shape or a bullet shape, so as to reduce the downward probing resistance. In one embodiment, the top portion 12 is in a sharp nozzle shape or a bullet shape, so as to reduce the resistance during upward pulling.

[0059] In one embodiment, the temperature measuring device 100 includes a limiting member 5. The limiting member 5 is fixed to the steel wire rope 3 and located in the receiving cavity 141, and the limiting member 5 abuts against or is fixed to the housing 1, so as to limit the movement of the steel wire rope 3 relative to the housing 1.

[0060] In one embodiment, after the first lower section 213 and the second lower section 223 are fixed, the U-shaped tube 29 is sleeved thereon. The arrangement of the U-shaped tube 29 can ensure the bending radius of the first lower section 213 and the second lower section 223 arranged in the receiving cavity 141 after connection, so as to reduce the optical loss and improve the accuracy of the measurement result.

[0061] In one embodiment, the U-shaped tube 29 is fixed to the steel wire rope 3 to prevent the first lower section 213 and the second lower section 223 from shaking, so as to avoid fracture under force.

[0062] The material of the U-shaped tube 29 and the sleeve 24 may be the same or different. The U-shaped tube 29 and the sleeve 24 may be of an integrated type or a separate type. The U-shaped tube 29 and the sleeve 24 may be fixed, for example, the U-shaped tube 29 covers the outer side of the sleeve 24, or the sleeve 24 covers the outer side of the U-shaped tube 29. There may also be a gap between the U-shaped tube 29 and the sleeve 24, and there is no fixed relationship between the two.

[0063] The first housing 13 and the second housing 14 are arranged along the thickness direction D of the temperature measuring device 100, which can facilitate the confirmation of the length of the first lower section 213 and the second lower section 223 after fiber fusion, and facilitate the arrangement of the first lower section 213 and the second lower section 223 along the edge of the receiving cavity 141, so as to prevent the first lower section 213 and the second lower section 223 from being damaged by bending or squeezed in the receiving cavity 141; at the same time, it is convenient to process and form the protruding block 144, which can better fix the steel wire rope 3 and prevent the steel wire rope 3 from shaking.

[0064] Reference Figures 12 to 13 , in one embodiment, the steel wire rope 3 is fixed to the housing 1, and the optical cable 2 without the steel wire rope 3 can be used, which can reduce the cost.

[0065] In one embodiment, the steel wire rope 3 and the housing 1 are formed by injection molding, which not only increases the stability, but also saves the assembly process.

[0066] In one embodiment, the steel wire rope 3 includes a pair of connecting portions 33 arranged in parallel, and two ends of the hook portion 322 are respectively connected to the pair of connecting portions 33.

[0067] In one embodiment, the hook portion 322 is in a water drop shape.

[0068] In one embodiment, the ends of the pair of connecting portions 33 are fixed by the fixing member 4. The fixing member 4 is placed in the second groove 143 of the housing 1 and then injection molded with the housing 1. After injection molding, the fixing member 4 and a part of the pair of connecting portions are covered by plastic.

[0069] In one embodiment, the steel wire rope 3 is fixed to the second housing 14. In one embodiment, the steel wire rope 3 is formed by injection molding with the second housing 14.

[0070] In one embodiment, the first housing 13 is provided with a glue filling port 131 communicating with the receiving cavity 141. After the first housing 13 and the second housing 14 are fixed, glue is filled into the receiving cavity 141 through the glue filling port 131, so as to seal and fix the first lower section 213 of the first optical fiber 21 and the second lower section 223 of the second optical fiber 22.

[0071] Reference Figure 14 , the embodiment of the present application further provides a temperature measurement system 300, which includes a main unit (not shown) and a plurality of temperature measurement devices 100. The plurality of temperature measurement devices 100 are connected in series through a plurality of first upper sections 211 and a plurality of second upper sections 221. The first upper section 211 or the second upper section 221 of the two temperature measurement devices 100 located at both ends are electrically connected to the main unit respectively.

[0072] In one embodiment, the first upper section 211 and the second upper section 221 between the plurality of temperature measurement devices 100 are fixed by optical fiber fusion or fixed by flange connection. A protective sleeve can be arranged at the optical fiber fusion position to increase the strength.

[0073] The temperature measurement system 300 of the embodiment of the present application uses optical fibers as sensors, the optical fibers run through the entire area that needs to be monitored (such as cable trays, the cables themselves, power distribution cabinets, etc.), the main unit emits laser pulses to the optical cable 2, and demodulates the temperature at each point on the entire optical cable 2 by analyzing the light intensity information of the backscattered Raman scattered light, so as to realize continuous distributed temperature measurement.

[0074] The temperature measurement system 300 of the present application overcomes the loss problem of traditional cable temperature measurement, realizes high-precision collection of temperature or environmental parameters, ensures long-distance and high-stability sensing performance, reduces signal transmission loss, improves measurement accuracy and system stability, and enhances system adaptability and intelligence; it realizes stable and efficient detection and management of granary environments, improves management efficiency, and facilitates the operation and monitoring of granaries.

[0075] The core technical features of the temperature measurement system 300 of the present application include: Distributed: Instead of measuring several points, measurement is performed continuously along the optical cable 2, and the number of measurement points can be thousands or tens of thousands.

[0076] Continuous real-time: Perform temperature scanning on the entire monitoring area 24 hours a day without interruption.

[0077] Accurate positioning: The position of the temperature abnormal point can be accurately determined, and the precision is usually within 0.1 meters.

[0078] The temperature measuring device 100 of this application can be installed later. The number of temperature measuring devices 100 can be adjusted according to the size of the grain warehouse. The position of the temperature measuring device 100 can also be adjusted according to the required temperature measurement position. It is also convenient to replace the temperature measuring device 100, making it more flexible and convenient to use.

[0079] It should be noted that the technical solutions or features described in the above embodiments can be combined or complemented by each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A temperature measuring device, characterized in that, include: The outer casing has a receiving cavity; An optical cable includes a first optical fiber, a second optical fiber, and a middle protective sleeve. The first optical fiber includes a first upper section, a first middle section, and a first lower section. The second optical fiber includes a second upper section, a second middle section, and a second lower section. The first middle section and the second middle section are located inside the middle protective sleeve. The first upper section and the second upper section are located on a first side of the middle protective sleeve. The first lower section and the second lower section are located on a second side of the middle protective sleeve. The first side and the second side are disposed opposite to each other. The first lower section and the second lower section are electrically connected and both are located inside the receiving cavity. At least a portion of the first upper section and at least a portion of the second upper section are located outside the outer shell.

2. The temperature measuring device according to claim 1, characterized in that, The first lower segment and the second lower segment are arranged along the edge of the receiving cavity; and / or, The first lower segment and the second lower segment are fixed to the outer casing; and / or, The receiving cavity is elongated elliptical, and the radius of the semicircle at the end of the elongated ellipse is greater than or equal to 25 mm.

3. The temperature measuring device according to claim 1, characterized in that, The first lower segment and the second lower segment are fixed together by fiber splicing, and the optical cable includes a sleeve to cover the fiber splicing connection between the first lower segment and the second lower segment; or, The first lower section and the second lower section are fixed together by a flange.

4. The temperature measuring device according to claim 1, characterized in that, The outer shell is provided with a first groove, and one end of the middle protective sleeve is located in the first groove. Along the direction from the first upper section to the first lower section, the middle protective sleeve abuts against the outer shell.

5. The temperature measuring device according to claim 1, characterized in that, The outer casing includes a first outer casing and a second outer casing fixed to the first outer casing. The first outer casing and the second outer casing are arranged along the thickness direction of the temperature measuring device, and the first outer casing and the second outer casing form the receiving cavity; or... The outer casing includes a first outer casing and a second outer casing fixed to the first outer casing. The first outer casing and the second outer casing are arranged along the length direction of the temperature measuring device and form the receiving cavity. The temperature measuring device includes a U-shaped tube, which is sleeved at the bend after the first lower section and the second lower section are connected.

6. The temperature measuring device according to any one of claims 1 to 5, characterized in that, The temperature measuring device includes a steel wire rope, which is fixed to at least one of the middle protective sleeve and the outer shell. The steel wire rope includes a hook, the end of which protrudes from the outer shell.

7. The temperature measuring device according to claim 6, characterized in that, The wire rope includes a fixed section fixed to the middle protective sleeve and an extension section connected to the fixed section. The extension section includes a main body section located within the receiving cavity, and the hook is connected to the main body section.

8. The temperature measuring device according to claim 7, characterized in that, The end of the extension is bent to form the hook. The temperature measuring device includes a fixing member to fix the free end of the hook to the main body section. The outer shell is provided with a second groove, and the fixing member is located in the second groove. Along the direction from the first upper section to the first lower section, the fixing member abuts against the outer shell; and / or, The outer casing includes a protrusion extending into the receiving cavity, the protrusion being located in the center of the receiving cavity, and the protrusion having a groove to receive the wire rope; and / or, The optical cable includes the steel wire rope, the fixed section is located inside the middle protective sleeve, and after the lower protective sleeve is removed, the first lower section, the second lower section and the extension section of the steel wire rope are exposed.

9. The temperature measuring device according to claim 6, characterized in that, The steel wire rope and the outer shell are injection molded together.

10. A temperature measurement system, characterized in that, The device includes a host and multiple temperature measuring devices as described in any one of claims 1 to 9. The multiple temperature measuring devices are connected in series through multiple first upper sections and multiple second upper sections. The first upper section or the second upper section of the two temperature measuring devices located at both ends is electrically connected to the host.

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