An electrically heated thermal sleeve for a flow tube of a flow meter

Abstract

The utility model discloses an electric heating heat preservation sleeve for elbow flowmeter, and particularly relates to flowmeter technical field, including elbow sensor and the pair of pressure tappings fixedly connected in the inner bend side and the outer bend side of elbow sensor, the outside of elbow sensor is provided with a pair of sheaths, and the both ends of each sheath are connected with the closing plate through the bolt, and the inside of each sheath is sequentially provided with outer thermal insulation structure and inner heat conduction structure from outside to inside, and the inner heat conduction structure contacts the outer surface of elbow sensor, and the outer thermal insulation structure is provided with electric heating element, the peripheral side of each sheath is integrally provided with fixed along, and the corresponding fixed along of a pair of sheaths is connected through the bolt, the outer thermal insulation structure includes vacuum cover, and the vacuum cover is fixedly connected at the inside of sheath, and the vacuum cover and sheath are provided with vacuum cavity, the utility model solves the technical problem that flowmeter heating heat preservation exists high energy consumption and short heat preservation time.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, and more specifically, to an electrically heated insulation sleeve for a bent-tube flow meter. Background Technology

[0002] A bend flow meter consists of a bend sensor, a bend flow meter main unit, a differential pressure transmitter, and some pipeline valve components. Bend flow meters can be classified into L-type and S-type according to their installation method, and into round tube type and square tube type according to their pipe shape. Bend flow meters belong to differential pressure flow measurement systems. To ensure normal operation of the bend flow meter in low-temperature environments, heat tracing is required to prevent the medium inside the pipe from freezing.

[0003] For example, the utility model with patent publication number CN218180039U discloses a heating structure for a target flow meter, including a target flow meter body. A lower shell and two upper shells are respectively fitted on the connecting flange of the target flow meter body. The front of the lower shell and the upper shell are rotatably connected by a connecting shaft. Heating wires are provided inside the lower shell and the upper shell. A power terminal is provided on the top of the upper shell. A connecting piece is fixedly installed on one end of the back of both the lower shell and the upper shell.

[0004] Although the above-mentioned patent meets the heat tracing requirements for flow meter antifreeze by direct heating, the heat preservation performance of this heating method is insufficient, the energy loss of the heat source is large, and the heat preservation time is shortened while increasing energy consumption.

[0005] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided an electrically heated insulation jacket for a bend flow meter, in order to achieve a more practical purpose. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that addresses the issues of high energy consumption and short heat preservation time during flow meter heating and heat preservation.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an electrically heated insulation sleeve for a bent pipe flow meter, comprising a bent pipe sensor and a pair of pressure tapping pipes respectively fixedly connected to the inner and outer bend sides of the bent pipe sensor. A pair of protective sleeves are provided on the outer side of the bent pipe sensor, and an outer insulation structure and an inner heat conduction structure are sequentially provided on the inner side of each protective sleeve from the outside to the inside. The inner heat conduction structure contacts the outer surface of the bent pipe sensor, and an electric heating element is provided on the outer insulation structure.

[0008] In a preferred embodiment, each sheath has an integrally formed fixing edge on its periphery, and a pair of corresponding fixing edges on the sheaths are connected by bolts.

[0009] In a preferred embodiment, the external insulation structure includes a vacuum hood, which is fixedly connected to the inner side of the sheath. A vacuum cavity is provided between the vacuum hood and the sheath, and an insulation layer is provided inside the vacuum cavity. The insulation layer is made of silicone foam material.

[0010] In a preferred embodiment, the heating element includes a heating tube fixedly connected to the inner surface of the vacuum chamber.

[0011] In a preferred embodiment, the internal heat-conducting structure includes a copper shield disposed inside the vacuum shield, a heat-conducting cavity is provided between the copper shield and the vacuum shield, the heat-conducting cavity is filled with heat-conducting oil, the heating element is immersed in the heat-conducting oil, and a composite heat-conducting layer is fixedly connected to the inner surface of the copper shield.

[0012] In a preferred embodiment, the copper cover is integrally provided with an assembly edge on its periphery, the assembly edge being connected to the vacuum cover by bolts, and both ends of the copper cover are provided with sealing plates.

[0013] In a preferred embodiment, the composite thermally conductive layer is composed of silicone rubber and glass fiber cloth, and a temperature sensor is disposed within the composite thermally conductive layer.

[0014] In a preferred embodiment, a safety valve is fixedly connected to the top of one of the sheaths, one end of which passes through the insulation layer and the vacuum shield in sequence and extends into the heat-conducting cavity.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. This electrically heated insulation jacket for a bent tube flow meter uses an electric heating tube and an inner heat-conducting structure on the outside of the bent tube sensor. The electric heating tube provides a stable heat source by heating the heat-conducting oil. Since the heat-conducting oil is used as the heating medium, the heating time can be extended. Then, the heat source is conducted through the composite heat-conducting layer. The composite heat-conducting layer can make the conducted heat evenly and efficiently transferred to the bent tube sensor, thus meeting the heating and insulation requirements of the flow medium inside the bent tube sensor.

[0017] 2. The electric heating insulation jacket used for the curved pipe flow meter reduces the heat transfer path by setting an external insulation structure and using a vacuum chamber for vacuum treatment. Combined with the insulation layer's low thermal conductivity, this maximizes the retention of heat and achieves efficient insulation, thereby reducing heating energy consumption and increasing insulation time. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall planar structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the sheath of this utility model;

[0021] Figure 3 This is a planar sectional view of the sheath of this utility model;

[0022] Figure 4 This utility model Figure 3 Enlarged view of section A in the middle;

[0023] Figure 5 This utility model Figure 3 Enlarged view of section B in the middle.

[0024] The attached figures are labeled as follows: 1. Bend sensor; 11. Pressure tapping tube; 2. Sheath; 3. External insulation structure; 31. Vacuum enclosure; 32. Vacuum chamber; 33. Insulation layer; 4. Fixing edge; 5. Heating tube; 6. Internal heat conduction structure; 61. Copper cover; 62. Heat conduction chamber; 63. Composite heat conduction layer; 7. Sealing plate; 8. Assembly edge; 9. Safety valve; 10. Temperature sensor. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] See also Figures 1-5 This utility model provides an electrically heated insulation sleeve for a bent pipe flow meter, including a bent pipe sensor 1 and a pair of pressure taps 11 respectively fixedly connected to the inner and outer bend sides of the bent pipe sensor 1. The bent pipe sensor 1 and the pressure taps 11 are two key components in existing bent pipe flow meters. The pair of pressure taps 11 can be externally connected to an existing differential pressure transmitter. The differential pressure transmitter can detect the pressure difference on both sides of the bent pipe sensor 1 through the pair of pressure taps 11. Since the working principle of the bent pipe flow meter is existing technology, it will not be described in detail here.

[0027] In this embodiment: a pair of sheaths 2 are provided on the outside of the bend sensor 1, and a fixing edge 4 is integrally provided on the periphery of each sheath 2. The corresponding fixing edges 4 on the pair of sheaths 2 are connected by bolts.

[0028] In this application, except for the pressure tapping tube 11, the bending sensor 1 does not have a protective sleeve 2. The number of protective sleeves 2 used at other positions can be determined according to the specific specifications of the bending sensor 1. The use of protective sleeves 2 should be adapted to the curvature of the bending sensor 1. The connection between the fixing edge 4 and the bolt can easily surround the outer surface of the bending sensor 1 with a pair of protective sleeves 2.

[0029] In this embodiment: each sheath 2 has an outer heat insulation structure 3 on its inner side. The outer heat insulation structure 3 includes a vacuum hood 31, which is fixedly connected to the inner side of the sheath 2. A vacuum cavity 32 is provided between the vacuum hood 31 and the sheath 2. An insulation layer 33 is provided inside the vacuum cavity 32. The insulation layer 33 is made of silicone foam material.

[0030] The vacuum shroud 31 is seamlessly connected to the ends of the sheath 2 at both ends. The vacuum shroud 31 is set inside the sheath 2 to form a vacuum cavity 32. The vacuum cavity 32 is a vacuum environment. The vacuum setting can reduce the heat conduction path, so that the inner side of the vacuum shroud 31 has a heat preservation function. The heat preservation layer 33 is made of silicone foam material. The heat preservation layer 33 can be fixed to the outer side of the vacuum shroud 31. The temperature resistance range of the heat preservation layer 33 is from -60℃ to 260℃. Its material is insulating and flame retardant, with low thermal conductivity and excellent heat preservation performance. This can further improve the heat source heat preservation performance inside the vacuum shroud 31. By improving the heat preservation performance of the bent tube sensor 1, the heating and heat preservation time can be extended and the heating energy consumption can be reduced.

[0031] It is worth noting that, in order to achieve a vacuum state in the vacuum chamber 32, an existing standard part can be installed on the sheath 2 as an accessory for use as a vacuum head. One end of the vacuum head passes through the sheath 2 and extends into the vacuum chamber 32, so that the vacuum chamber 32 can easily achieve a vacuum effect.

[0032] In this embodiment: an electric heating element is provided on the external insulation structure 3, the electric heating element includes an electric heating tube 5, and the electric heating tube 5 is fixedly connected to the inner surface of the vacuum shroud 31.

[0033] The heating element 5 is model JRQ-FB001. Multiple heating elements 5 can be installed. The heating element 5 can heat the inside of the vacuum shroud 31 towards the bending sensor 1 to provide a heat source to prevent freezing of the bending sensor 1. The heating element 5 can be connected to the vacuum shroud 31 by fasteners. The fasteners can be standard parts such as tube sleeves and bolts to install the heating element 5 on the vacuum shroud 31, so that the heating element 5 can be easily disassembled and maintained later. When the heating element 5 is in use, its wiring terminal is connected to a mature temperature controller through the heating power cord so that the temperature controller can start and stop the heating of the heating element 5.

[0034] In this embodiment: Each sheath 2 has an inner heat-conducting structure 6 on its inner side. The inner heat-conducting structure 6 contacts the outer surface of the bent tube sensor 1. The inner heat-conducting structure 6 includes a copper cover 61, which is disposed inside the vacuum shroud 31. A heat-conducting cavity 62 is disposed between the copper cover 61 and the vacuum shroud 31. The heat-conducting cavity 62 is filled with heat-conducting oil. The heating tube 5 is immersed in the heat-conducting oil. A composite heat-conducting layer 63 is fixedly connected to the inner surface of the copper cover 61. The composite heat-conducting layer 63 is made of silicone rubber and glass fiber cloth.

[0035] Because the heating element 5 is immersed in the heat transfer oil, when the heating element 5 is heated under the control of the thermostat, the heating element 5 can heat the heat transfer oil. Because the material of the copper cover 61 has high thermal conductivity, the heat of the heat transfer oil can be transferred to the composite heat transfer layer 63 through the copper cover 61. The composite heat transfer layer 63, which is made of silicone rubber and glass fiber cloth, has the characteristics of fast heating, uniform temperature, high thermal efficiency, high strength and not easy aging. It can efficiently conduct heat when it is tightly attached to the bent tube sensor 1 to meet the heat tracing requirements.

[0036] It is worth noting that, in order to improve the durability of the vacuum shield 31 and the copper shield 61 that are in contact with the heat transfer oil, an anti-corrosion coating can be applied to their opposite surfaces.

[0037] In this embodiment, the copper cover 61 is integrally provided with an assembly edge 8 on its periphery, and the assembly edge 8 is connected to the vacuum cover 31 by bolts.

[0038] In this application, an assembly groove is provided at the bottom of the end of the vacuum shroud 31, and the assembly edge 8 is located in the assembly groove. The assembly edge 8 is connected to the assembly groove by bolts, which makes it easy to remove the copper cover 61 from the vacuum shroud 31. Since the heating tube 5 is set on the vacuum shroud 31, this makes it easy to maintain the heating tube 5. A countersunk hole can be provided on the assembly edge 8 to cooperate with the installation of bolts to prevent protrusion. A sealing gasket can be placed at the connection between the assembly edge 8 and the assembly groove to improve the sealing of the connection between the vacuum shroud 31 and the copper cover 61.

[0039] In this embodiment, sealing plates 7 are provided at both ends of the copper cover 61.

[0040] The copper cover 61 has open ends. The size of the sealing plate 7 is adapted to the size of the ends of the copper cover 61 and the heat conduction cavity 62. The sealing plate 7 can seal the copper cover 61 to achieve a sealing effect for the heat conduction cavity 62. When sealing, the sealing plate 7 can be bolted to the copper cover 61 and the vacuum diaphragm 31. In use, the sealing plate 7 can be embedded with a conventional sealing ring to improve the sealing performance. The ends of the copper cover 61 and the vacuum diaphragm 31, as well as the side of the copper cover 61, can be provided with grooves that match the sealing rings. In this way, the sealing plate 7 can ensure the reliability of heat transfer oil storage.

[0041] In this embodiment, a temperature sensor 10 is installed inside the composite thermally conductive layer 63.

[0042] The temperature sensor 10 is a Pt100, and its output can be connected to the temperature controller via a sensing signal line. In this way, the temperature controller can monitor the temperature of the composite heat-conducting layer 63 and the position of the bent tube sensor 1 in real time. The temperature controller sets the temperature at which the bent tube sensor 1 is kept warm by heat tracing. In this way, the temperature controller can accurately control the start and stop of the electric heating tube 5 according to the set temperature. Since the electric heating tube 5 is placed in the heat-conducting oil, the heat-conducting oil can continue to heat and keep the bent tube sensor 1 warm after the electric heating tube 5 stops, which can effectively reduce the working energy consumption of the electric heating tube 5.

[0043] In this embodiment: the top of one of the sheaths 2 is fixedly connected to one end of the safety valve 9, which passes through the insulation layer 33 and the vacuum shield 31 and extends into the heat conduction cavity 62.

[0044] In this application, a pair of sheaths 2 can be installed vertically, and a safety valve 9 can be installed on the sheath 2 located at the top. When the heat conduction cavity 62 is overpressurized due to heating by heat conduction oil, the safety valve 9, as a general standard component, can safely relieve the pressure in the heat conduction cavity 62.

Claims

1. An electrically heated insulation sleeve for a bent pipe flow meter, comprising a bent pipe sensor (1) and a pair of pressure tapping pipes (11) respectively fixedly connected to the inner and outer bend sides of the bent pipe sensor (1), characterized in that: The outer side of the bend sensor (1) is provided with a pair of sheaths (2), and the inner side of each sheath (2) is provided with an outer heat insulation structure (3) and an inner heat conduction structure (6) from the outside to the inside. The inner heat conduction structure (6) contacts the outer surface of the bend sensor (1), and an electric heating element is provided on the outer heat insulation structure (3).

2. The electrically heated insulation jacket for a bent-tube flow meter according to claim 1, characterized in that: Each sheath (2) is integrally provided with a fixing edge (4) on its periphery, and the corresponding fixing edges (4) on a pair of sheaths (2) are connected by bolts.

3. The electrically heated insulation jacket for a bent-pipe flow meter according to claim 1, characterized in that: The external insulation structure (3) includes a vacuum cover (31), which is fixedly connected to the inner side of the sheath (2). A vacuum cavity (32) is provided between the vacuum cover (31) and the sheath (2). An insulation layer (33) is provided inside the vacuum cavity (32), and the insulation layer (33) is made of silicone foam material.

4. The electrically heated insulation jacket for a bent-pipe flow meter according to claim 3, characterized in that: The heating element includes a heating tube (5), which is fixedly connected to the inner surface of the vacuum shroud (31).

5. An electrically heated insulation jacket for a bent-pipe flow meter according to claim 4, characterized in that: The internal heat-conducting structure (6) includes a copper cover (61), which is disposed inside the vacuum shield (31). A heat-conducting cavity (62) is provided between the copper cover (61) and the vacuum shield (31). The heat-conducting cavity (62) is filled with heat-conducting oil. The electric heating tube (5) is immersed in the heat-conducting oil. A composite heat-conducting layer (63) is fixedly connected to the inner surface of the copper cover (61).

6. An electrically heated insulation jacket for a bent-pipe flow meter according to claim 5, characterized in that: The copper cover (61) is integrally provided with an assembly edge (8) on its periphery. The assembly edge (8) is connected to the vacuum hood (31) by bolts. Both ends of the copper cover (61) are provided with sealing plates (7).

7. An electrically heated insulation jacket for a bent-pipe flow meter according to claim 5, characterized in that: The composite thermal conductive layer (63) is made of silicone rubber and glass fiber cloth, and a temperature sensor (10) is provided inside the composite thermal conductive layer (63).

8. An electrically heated insulation jacket for a bent-pipe flow meter according to claim 5, characterized in that: One of them A safety valve (9) is fixedly connected to the top of the sheath (2). One end of the safety valve (9) passes through the insulation layer (33) and the vacuum hood (31) in sequence and extends into the heat conduction cavity (62).

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