Low-temperature-resistant mass flow meter

Abstract

The utility model provides a low-temperature-resistant mass flow meter which comprises a flow meter body, a heat preservation sheath and two heat tracing plates, and the flow meter body comprises a shell; the heat preservation sheath covers the periphery of the shell and comprises a first sheath shell and a second sheath shell; the two heat tracing plates are arranged on the inner sides of the first sheath shell and the second sheath shell in a one-to-one correspondence mode, heating cavities are formed in the heat tracing plates, heating pieces are arranged in the heating cavities, and the inner side walls of the heat tracing plates can be attached to the outer side wall of the shell so as to supply heat to the flowmeter body. According to the low-temperature-resistant mass flow meter provided by the utility model, the heat preservation sheath covers the periphery of the shell, so that heat loss can be effectively reduced, and a preliminary heat preservation effect is achieved. The heat tracing plate is attached to the outer side wall of the shell, heat can be supplied to the flow meter body when the heating piece works, the stability and reliable measurement precision of the mass flow meter in a low-temperature environment are guaranteed, and meanwhile the service life of the mass flow meter is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline fluid flow detection technology, specifically relating to a low-temperature resistant mass flow meter. Background Technology

[0002] Mass flow meters, as high-precision and high-reliability flow measurement instruments, have advantages such as high measurement accuracy, good stability, and fast response speed, and are widely used in petroleum, chemical, pharmaceutical, and food industries. Among them, the Coriolis mass flow meter measures flow rate by utilizing the Coriolis force generated when fluid flows through a vibrating tube. When fluid flows through the vibrating measuring tube, the fluid's mass causes the measuring tube to twist, and the degree of twist is proportional to the fluid's mass flow rate. The fluid's mass flow rate is calculated by measuring the phase difference caused by this twist.

[0003] However, in some low-temperature operating scenarios, the performance of the electronic sensing components inside the mass flow meter will degrade significantly, thereby reducing measurement accuracy. At the same time, low temperatures will also affect the mechanical components of the mass flow meter. For example, the physical properties of the material in the measuring tube of a Coriolis mass flow meter are easily altered at low temperatures, leading to reduced toughness and increased brittleness. Frequent fluid impacts and vibrations can easily cause cracks or even breakage in the measuring tube, greatly shortening the service life of the flow meter and increasing maintenance costs and downtime. Utility Model Content

[0004] This utility model provides a low-temperature resistant mass flow meter, which can ensure the stability and reliable measurement accuracy of the mass flow meter in low-temperature environments, and at the same time help to extend the service life of the mass flow meter.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a low-temperature resistant mass flow meter is provided, comprising a flow meter body, an insulation sleeve, and two heat tracing plates. The flow meter body includes a housing; the insulation sleeve is disposed on the outer periphery of the housing, and the insulation sleeve includes a first sleeve shell and a second sleeve shell symmetrically located on both sides of the housing, and the first sleeve shell and the second sleeve shell are connected by a connecting structure; the two heat tracing plates are correspondingly disposed on the inner sides of the first sleeve shell and the second sleeve shell, and the interior of the heat tracing plate has a heating cavity, in which a heating element is disposed, and the inner sidewall of the heat tracing plate can be attached to the outer sidewall of the housing to supply heat to the flow meter body.

[0006] In one possible implementation, the inner walls of the first sheath and the second sheath are respectively provided with receiving grooves with opposite openings. The heat tracing plate is slidably connected in the receiving grooves, and a push rod is rotatably connected to the heat tracing plate. The push rod passes through the first sheath / second sheath and is threadedly connected to the first sheath / second sheath.

[0007] In some embodiments, the heat tracing plate is provided with a rotating groove, and the inner end of the push rod is connected to a push block, which is located in the rotating groove and rotates in cooperation with the rotating groove.

[0008] In one possible implementation, the heating element is an electric heating rod connected to a heating chamber filled with salt water.

[0009] In some embodiments, two electric heating rods are provided, with the two electric heating rods respectively located near the two ends of the heating chamber, and a spiral heating wire connecting the two electric heating rods.

[0010] In one possible implementation, the first and second sheaths have vacuum cavities.

[0011] In one possible implementation, a circumferentially extending sealing strip is connected to the inner end face of the first sheath, and a sealing groove is provided on the inner end face of the second sheath for interlocking with the sealing strip.

[0012] In one possible implementation, the connection structure includes a plate connecting assembly located at the top of the insulation sleeve and a rod connecting assembly located at the bottom of the insulation sleeve. Both the plate connecting assembly and the rod connecting assembly are provided in two sets, and are arranged in a one-to-one correspondence between the top and bottom.

[0013] In some embodiments, the connecting plate assembly includes a connecting plate, a positioning seat, a positioning rod, and an elastic element. The connecting plate is rotatably connected to the upper edge of the first sheath and can be vertically flipped to overlap the upper edge of the second sheath. The positioning seat is connected to the upper edge of the second sheath and has a sliding groove. The positioning rod is horizontally slidably connected to the positioning seat and passes through the sliding groove. An annular boss is provided on the peripheral wall of the positioning rod. The elastic element is sleeved on the outer periphery of the positioning rod and connected between the bottom wall of the sliding groove and the annular boss.

[0014] The side wall of the slab is provided with positioning holes, and the elastic element is used to elastically push the annular boss so that the positioning rod is inserted into the positioning hole.

[0015] In some embodiments, the plug connection assembly includes a plug and a limiting plate. The plug is connected to the outer edge of the first sheath. The extended end of the plug has a limiting platform that protrudes outward. The peripheral wall of the plug has a radially through-hole that extends axially through the limiting platform so that the plug forms two snap-fit ​​parts that can be elastically opened and closed. The limiting plate is connected to the outer edge of the second sheath and has a limiting hole that engages with the plug.

[0016] The limiting platform is used to engage with the outside of the limiting plate when the insertion rod is inserted into the limiting hole.

[0017] The beneficial effects of this low-temperature resistant mass flow meter are as follows: Compared with the prior art, the low-temperature resistant mass flow meter of this invention features an insulating sleeve covering the outer periphery of the housing, which effectively reduces heat loss and provides initial insulation. Simultaneously, two heat tracing plates are respectively attached to the two outer side walls of the housing. When the heating element in the heating chamber is working, it can directly supply heat to the flow meter body, ensuring the stability and reliable measurement accuracy of the mass flow meter in low-temperature environments, and also helping to extend the service life of the mass flow meter. Furthermore, the insulating sleeve is formed by connecting the first and second insulating sleeves symmetrically arranged on both sides of the flow meter body, facilitating the installation and removal of the insulating sleeve, simplifying the inspection and maintenance of the flow meter body, and improving the practicality of the mass flow meter. Attached Figure Description

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

[0019] Figure 1 A schematic diagram of a low-temperature resistant mass flow meter provided for an embodiment of this utility model;

[0020] Figure 2 This is an embodiment of the present utility model. Figure 1 Schematic diagram of the cross-sectional structure along line A in the middle;

[0021] Figure 3 This is an embodiment of the present utility model. Figure 1 Schematic diagram of the cross-sectional structure along line B in the middle;

[0022] Figure 4 A side sectional view of a low-temperature resistant mass flow meter provided for an embodiment of this utility model;

[0023] Figure 5 This is a front cross-sectional view of a low-temperature resistant mass flow meter provided in an embodiment of the present invention.

[0024] The following are the labeling elements in the figure:

[0025] 1. Flowmeter body; 11. Housing; 12. Flange pipe; 13. Converter; 2. Insulation sleeve; 21. First sleeve shell; 211. Receiving groove; 212. Vacuum chamber; 213. Support block; 214. Sealing strip; 22. Second sleeve shell; 221. Sealing groove; 3. Heat tracing plate; 31. Heating chamber; 32. Electric heating rod; 33. Heating wire; 34. Rotating groove; 4. Push rod; 41. Push block; 5. Plate connecting assembly; 51. Plate; 511. Positioning hole; 52. Positioning seat; 521. Sliding groove; 53. Positioning rod; 531. Annular boss; 54. Elastic element; 6. Insert rod connecting assembly; 61. Insert rod; 611. Limiting platform; 612. Notch; 62. Limiting plate; 621. Limiting hole. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0028] Please refer to the following: Figures 1 to 5The present invention provides a low-temperature resistant mass flow meter. The low-temperature resistant mass flow meter includes a flow meter body 1, an insulation sleeve 2, and two heat tracing plates 3. The flow meter body 1 includes a housing 11; the insulation sleeve 2 covers the outer periphery of the housing 11 and includes a first sleeve shell 21 and a second sleeve shell 22 symmetrically located on both sides of the housing 11, connected by a connecting structure; the two heat tracing plates 3 are correspondingly disposed inside the first sleeve shell 21 and the second sleeve shell 22, and each heat tracing plate 3 has a heating cavity 31 containing a heating element. The inner wall of the heat tracing plate 3 can adhere to the outer wall of the housing 11 to supply heat to the flow meter body 1.

[0029] This embodiment provides a low-temperature resistant mass flow meter. Compared with existing technologies, the insulating sleeve 2 is installed around the outer periphery of the housing 11, which can effectively reduce heat loss and play a preliminary role in heat preservation. Simultaneously, two heat tracing plates 3 are respectively attached to the two outer side walls of the housing 11. When the heating element in the heating chamber 31 is working, it can directly supply heat to the flow meter body 1, ensuring the stability and reliable measurement accuracy of the mass flow meter in low-temperature environments, and also helping to extend the service life of the mass flow meter. Furthermore, the insulating sleeve 2 is formed by connecting the first protective sleeve 21 and the second protective sleeve 22 symmetrically arranged on both sides of the flow meter body 1. This facilitates the installation and removal of the insulating sleeve 2, making it convenient for the inspection and maintenance of the flow meter body 1, and improving the practicality of the mass flow meter.

[0030] It should be understood that the mass flow meter in this embodiment is a Coriolis mass flow meter. The housing 11 of the flow meter body 1 contains two flow tubes. Both the inlet and outlet ends of the housing 11 are connected to flange pipes 12. A flow divider is installed within the flange pipes 12 to divert fluid from the pipeline into the two flow tubes. This dual-tube design reduces sensitivity to external vibrations, facilitates phase difference measurement, and results in more accurate and precise measurements. A converter 13 for signal conversion is connected to the upper part of the housing 11.

[0031] During flow measurement, the drive coil inside the housing 11 applies a periodic excitation force to the flow tube, causing the flow tube to vibrate at its natural frequency. When the fluid enters the flow tube, it is subjected to Coriolis force, causing the measuring tube to twist and deform. The detection element inside the housing 11 (usually an electromagnetic sensor or a piezoelectric sensor) can convert this minute mechanical deformation into a corresponding electrical signal change and transmit it to the converter 13. The converter 13 processes and calculates the electrical signal and finally outputs the flow measurement results, such as the flow rate, through the display screen.

[0032] In this embodiment, the shape of the insulation sleeve 2 matches the outer shape of the shell 11, and it has clearance holes at both ends and the top to allow the flange pipe 12 and the converter 13 to pass through. Specifically, the diameter of the clearance hole is larger than the outer diameter of the corresponding part of the flange pipe 12 or the converter 13, and insulation cotton is placed inside the clearance hole so that the insulation cotton covers the outer periphery of the flange pipe 12 and the converter 13 to ensure the insulation effect of the insulation sleeve 2. The two heat tracing plates 3 are respectively attached to the two outer side walls of the shell 11 to maximize the contact area between the heat tracing plates 3 and the shell 11, thereby improving the heat tracing efficiency.

[0033] In some embodiments, the heat tracing plate 3 and the first sheath 21 / second sheath 22 can be connected by, for example, Figure 4 The structure shown is described in the following document. Figure 4 The inner wall of the first sheath 21 and the inner wall of the second sheath 22 are respectively provided with receiving grooves 211 with opposite openings. The heat tracing plate 3 is slidably connected in the receiving groove 211. A push rod 4 is rotatably connected to the heat tracing plate 3. The push rod 4 is set through the first sheath 21 / second sheath 22 and is threadedly connected to the first sheath 21 / second sheath 22.

[0034] After the first sheath 21 and the second sheath 22 are clamped around the outer periphery of the housing 11, the heat tracing plate 3 may not be able to adhere to the outer wall of the housing 11 due to processing errors and other reasons. If there is a gap between the heat tracing plate 3 and the housing 11, the heat tracing effect will be greatly reduced. In this embodiment, by forming a sliding fit between the heat tracing plate 3 and the first sheath 21 / second sheath 22, and by rotating the push rod 4 to drive the heat tracing plate 3 to slide, it is possible to control the movement of the heat tracing plate 3 towards the outer wall of the housing 11 after the insulation sheath 2 is installed, so as to ensure the adhesion effect between the heat tracing plate 3 and the housing 11.

[0035] Furthermore, the above structure allows the insulation sleeve 2 to be adapted to flowmeter bodies 1 of different sizes, increasing the versatility of the insulation sleeve 2. Simultaneously, by tightening the push rod 4, the heat tracing plate 3 is tightly fitted to the outer wall of the housing 11, which also provides a certain clamping effect on the housing 11, thereby ensuring that the insulation sleeve 2 is reliably connected to the flowmeter body 1 and preventing the insulation sleeve 2 from loosening or shifting during use.

[0036] Specifically, the dimensions of the receiving groove 211 are adapted to the external dimensions of the heat tracing plate 3 to ensure the stability of the heat tracing plate 3 during movement. Alternatively, guide strips are provided on the sidewalls of the receiving groove 211, and guide grooves that slide in cooperation with the guide strips are provided on the outer peripheral wall of the heat tracing plate 3 to further increase the stability of the heat tracing plate 3 during sliding.

[0037] For example, the heat tracing plate 3 is provided with a rotating groove 34, and the inner end of the push rod 4 is connected to a push block 41. The push block 41 is located in the rotating groove 34 and rotates with the rotating groove 34. Since the push rod 4 is threadedly connected to the first sheath 21 / second sheath 22, when the push rod 4 is rotated, the push rod 4 will translate towards the housing 11, and then push the heat tracing plate 3 towards the outer wall of the housing 11 through the push block 41. The setting of the rotating groove 34 and the push block 41 realizes the rotational connection between the push rod 4 and the heat tracing plate 3, avoiding the situation where the push rod 4 cannot be smoothly adjusted due to restriction during rotation, thereby realizing the adjustment of the position of the heat tracing plate 3.

[0038] Specifically, the push rod 4 can be structured with the push block 41 fixedly connected to the inner end of the hexagonal head bolt, making it easy to rotate the push rod 4 from the outside of the insulation sleeve 2 using tools such as a wrench. More specifically, the rotating groove 34 is a T-shaped groove, which can restrict the axial movement of the push block 41 within the rotating groove 34. Thus, when the push rod 4 is rotated in the opposite direction, the push rod 4 can pull the heat tracing plate 3 outward through the push block 41, so that the heat tracing plate 3 is housed in the receiving groove 211.

[0039] In some possible embodiments, the heating element described above can be as follows: Figure 4 The structure shown is described in the following document. Figure 4 The heating element is an electric heating rod 32 connected inside the heating chamber 31, which is filled with salt water.

[0040] Saltwater has a higher specific heat capacity and better thermal conductivity than ordinary water, enabling it to absorb the heat generated by the electric heating rod 32 more quickly and distribute the heat more evenly to all parts of the heating chamber 31, thereby improving the heating efficiency of the heat tracing plate 3 on the flow meter body 1. Simultaneously, keeping the saltwater in constant contact with the electric heating rod 32 and absorbing its heat protects the electric heating rod 32, extends its service life, and improves the safety and reliability of the heat tracing system.

[0041] Preferably, two electric heating rods 32 are provided, and the two electric heating rods 32 are respectively arranged near the two ends of the heating chamber 31. A spiral heating wire 33 is connected between the two electric heating rods 32. The spiral arrangement of the heating wire 33 can effectively increase the contact area between the heating wire 33 and the brine, thereby improving the heating speed and helping to save energy consumption.

[0042] It should be noted that a temperature sensor is connected to the heat tracing plate 3, and the wires of the electric heating rod 32 pass through the heat tracing plate 3 and the insulation sleeve 2 and are connected to a controller. The temperature sensor monitors the temperature inside the heating chamber 31 in real time, and the controller is used to control the start and stop of the electric heating rod 32 according to the actual temperature requirements. A connector for adding or discharging brine is also connected to the side wall of the heat tracing plate 3.

[0043] In some possible embodiments, the first sheath 21 and the second sheath 22 have a vacuum cavity 212. The vacuum cavity 212 acts as a good thermal insulation barrier, which can reduce heat loss within the insulation sheath 2, making the temperature of the shell 11 more stable, which helps to improve heating efficiency and thus reduce energy consumption.

[0044] Furthermore, multiple support blocks 213 can be spaced out inside the vacuum chamber 212. The support blocks 213 are used to support the two side walls of the vacuum chamber 212 to prevent the vacuum chamber 212 from deforming due to force.

[0045] In some embodiments, the first sheath 21 and the second sheath 22 may be connected by a method such as Figure 4 and Figure 5 The structure shown is described in the following document. Figure 4 and Figure 5 The inner end face of the first sheath 21 is connected with a circumferentially extending sealing strip 214, and the inner end face of the second sheath 22 is provided with a sealing groove 221 that is inserted and matched with the sealing strip 214.

[0046] In this embodiment, after the first sheath shell 21 and the second sheath shell 22 are connected and assembled into the heat insulation sheath 2, the sealing strip 214 can be inserted into the sealing groove 221, thereby forming an effective sealing barrier and effectively preventing heat loss from the connection gap.

[0047] In addition, the cooperation between the sealing strip 214 and the sealing groove 221 can provide accurate positioning for the assembly of the first sheath 21 and the second sheath 22, ensuring that the two sheaths can be precisely aligned during installation. At the same time, after the sealing strip 214 and the sealing groove 221 are inserted into each other, the connection area and friction between the first sheath 21 and the second sheath 22 are increased to a certain extent, which helps to improve the stability of the connection and prevent the first sheath 21 and the second sheath 22 from loosening.

[0048] Specifically, both the sealing strip 214 and the sealing groove 221 extend circumferentially to form a complete sealing ring, ensuring no sealing breaks and thus guaranteeing the insulation effect of the insulation sleeve 2.

[0049] In some embodiments, the above connection structure adopts, for example... Figure 1 The structure shown is described in the following document. Figure 1 The connection structure includes a plate connecting assembly 5 located at the top of the insulation sleeve 2 and a rod connecting assembly 6 located at the bottom of the insulation sleeve 2. Both the plate connecting assembly 5 and the rod connecting assembly 6 are provided in two sets, and are arranged in a corresponding manner, one above the other.

[0050] In this embodiment, two sets of connecting plate components 5 and insert rod components 6 are provided and are arranged correspondingly at the top and bottom, so that reliable connection points are formed at the top and bottom of the insulation sleeve 2, realizing multi-point fixation, enhancing the stability of the insulation sleeve 2, and effectively preventing problems such as loosening and falling off during use.

[0051] In addition, during assembly, the lower plug rod connecting assembly 6 is connected first to form a preliminary positioning, and then the top mounting plate connecting assembly 5 is connected. This allows for quick and accurate connection operations, reducing adjustment and calibration time during installation. Compared with bolt connections, the plug rod connecting assembly 6 and mounting plate connecting assembly 5 are simpler and faster to operate, improving installation efficiency.

[0052] In some embodiments, the above-mentioned step plate connection assembly 5 adopts the following... Figure 2 The structure shown is described in the following document. Figure 2 The connecting plate assembly 5 includes a connecting plate 51, a positioning seat 52, a positioning rod 53, and an elastic element 54. The connecting plate 51 is rotatably connected to the upper edge of the first protective shell 21, and the connecting plate 51 can be vertically flipped to overlap the upper edge of the second protective shell 22. The positioning seat 52 is connected to the upper edge of the second protective shell 22, and the positioning seat 52 is provided with a sliding groove 521. The positioning rod 53 is horizontally slidably connected to the positioning seat 52 and is provided through the sliding groove 521. The peripheral wall of the positioning rod 53 is provided with an annular boss 531. The elastic element 54 is sleeved on the outer periphery of the positioning rod 53 and is connected between the bottom wall of the sliding groove 521 and the annular boss 531. The side wall of the connecting plate 51 is provided with a positioning hole 511, and the elastic element 54 is used to elastically push the annular boss 531 so that the positioning rod 53 is inserted into the positioning hole 511.

[0053] In this embodiment, the mounting plate 51 is vertically flipped around the rotation connection point with the first sheath shell 21, so that its free end overlaps the upper edge of the second sheath shell 22. At this time, the positioning rod 53 on the second sheath shell 22 is axially aligned with the positioning hole 511 on the mounting plate 51. Under the elastic pushing action of the elastic member 54, the positioning rod 53 moves to one side of the mounting plate 51 until its end is inserted into the positioning hole 511, thereby realizing the insertion and positioning of the positioning rod 53 on the mounting plate 51, and thus connecting the first sheath shell 21 and the second sheath shell 22 together through the mounting plate connecting assembly 5.

[0054] Specifically, the elastic element 54 is a cylindrical spring, with one end fixed to the bottom wall of the sliding groove 521 and the other end connected to the annular boss 531. When the elastic element 54 is in the reset state, it can maintain the insertion state of the positioning rod 53 and the positioning hole 511, ensuring the reliable connection of the mounting plate connecting assembly 5. When it is necessary to remove the insulation sleeve 2, the positioning rod 53 needs to be pulled outward. At this time, the elastic element 54 is compressed, thereby causing the positioning rod 53 to disengage from the positioning hole 511, thus releasing the mounting plate 51.

[0055] In some embodiments, the aforementioned plug connection assembly 6 employs, as shown in... Figure 3 The structure shown is described in the following document. Figure 3 The insertion rod connecting assembly 6 includes an insertion rod 61 and a limiting plate 62. The insertion rod 61 is connected to the outer edge of the first sheath shell 21. The extended end of the insertion rod 61 is provided with a limiting platform 611 protruding outward. The peripheral wall of the insertion rod 61 is provided with a radially through notch 612. The notch 612 extends axially to penetrate the limiting platform 611 so that the insertion rod 61 forms two snap-fit ​​parts that can be elastically opened and closed. The limiting plate 62 is connected to the outer edge of the second sheath shell 22. The limiting plate 62 is provided with a limiting hole 621 that is engaged with the insertion rod 61. The limiting platform 611 is used to snap onto the outside of the limiting plate 62 when the insertion rod 61 is inserted into the limiting hole 621.

[0056] In this embodiment, the inner diameter of the limiting hole 621 is adapted to the diameter of the insertion rod 61, while the maximum diameter of the limiting platform 611 is larger than the inner diameter of the limiting hole 621, so that the limiting platform 611 can be snapped onto the outside of the limiting plate 62, thereby realizing the snap-fit ​​connection between the insertion rod 61 and the limiting plate 62.

[0057] Specifically, the notch 612 divides the insertion rod 61 into two opposing engaging parts, both of which are elastic. When the insertion rod 61 approaches the limiting hole 621, the limiting platform 611 first contacts the edge of the limiting hole 621. Since the outer edge of the limiting platform 611 is arc-shaped, it easily slides into the limiting hole 621. Under the pressure of the hole wall of the limiting hole 621, the two engaging parts move closer to each other, allowing the limiting platform 611 to pass through the limiting hole 621. After the limiting platform 611 has completely passed through the limiting hole 621, the two engaging parts return to their original shape under their own elasticity, realizing the engagement between the limiting platform 611 and the limiting plate 62, thereby achieving a reliable connection between the first sheath 21 and the second sheath 22.

[0058] When it is necessary to disassemble the plug rod connecting assembly 6, the limiting platform 611 must be manually squeezed first to bring the two locking parts closer together and retract them into the limiting hole 621. At the same time, the limiting plate 62 is pulled to disengage the limiting platform 611 from the limiting hole 621, thereby separating the plug rod 61 from the limiting plate 62.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low temperature resistant mass flow meter, characterized by, The utility model relates to a flowmeter body (1) including a shell (11), a heat preservation sheath (2) covering the outer periphery of the shell (11), the heat preservation sheath (2) including a first sheath shell (21) and a second sheath shell (22) symmetrically located on both sides of the shell (11), the first sheath shell (21) and the second sheath shell (22) being connected by a connecting structure, and two heat tracing plates (3) corresponding to the first sheath shell (21) and the second sheath shell (22) being arranged on the inner side of the first sheath shell (21) and the second sheath shell (22) respectively, the heat tracing plate (3) having a heating cavity (31) inside, the heating cavity (31) being provided with a heating element, and the inner side wall of the heat tracing plate (3) being capable of being attached to the outer side wall of the shell (11) to supply heat to the flowmeter body (1). The inner wall of the first sheath shell (21) and the inner wall of the second sheath shell (22) are respectively provided with an open opposite accommodating groove (211), the heat tracing plate (3) is slidingly connected in the accommodating groove (211), a push rod (4) is rotatably connected to the heat tracing plate (3), and the push rod (4) penetrates through the first sheath shell (21) / the second sheath shell (22) and is threadedly connected with the first sheath shell (21) / the second sheath shell (22). The heat tracing plate (3) is provided with a rotating groove (34), the inner end of the push rod (4) is connected with a push block (41), and the push block (41) is located in the rotating groove (34) and rotatably matched with the rotating groove (34). The heating element is an electric heating rod (32) connected in the heating cavity (31), and the heating cavity (31) is filled with brine. The electric heating rod (32) is provided with two, the two electric heating rods (32) are arranged close to the two ends of the heating cavity (31), and a spiral heating wire (33) is connected between the two electric heating rods (32).

2. A low temperature resistant mass flow meter as in claim 1, wherein, The first sheath shell (21) and the second sheath shell (22) have a vacuum cavity (212) inside.

3. A cryogenically resistant mass flowmeter as recited in claim 2, wherein, The inner end surface of the first sheath shell (21) is connected with a circumferentially extending sealing insert strip (214), and the inner end surface of the second sheath shell (22) is provided with a sealing groove (221) in plug-in cooperation with the sealing insert strip (214).

4. A cryogenically resistant mass flowmeter as recited in claim 1, wherein, The connecting structure includes a clamping plate connecting assembly (5) at the top of the heat preservation sheath (2) and a plug rod connecting assembly (6) at the lower part of the heat preservation sheath (2), the clamping plate connecting assembly (5) and the plug rod connecting assembly (6) are each provided with two groups and are arranged one over the other in one-to-one correspondence.

5. A cryogenically resistant mass flowmeter as recited in claim 4, wherein, The clamping plate connecting assembly (5) includes a clamping plate (51) rotatably connected to the upper edge of the first sheath shell (21), the clamping plate (51) being capable of being vertically flipped to be clamped on the upper edge of the second sheath shell (22), a positioning seat (52) connected to the upper edge of the second sheath shell (22), the positioning seat (52) being provided with a sliding groove (521), and a clamping plate connecting assembly (5) provided with a clamping plate (51) and a positioning seat (52).

6. A cryogenically resistant mass flowmeter as recited in claim 1, wherein, ​ 7. A cryogenically resistant mass flowmeter as recited in claim 1, wherein, ​ 8. A cryogenically resistant mass flowmeter as recited in claim 1, wherein, ​ 9. A cryogenically resistant mass flowmeter as recited in claim 8, wherein, ​ ​ ​ A positioning rod (53) is horizontally and slidingly connected to the positioning base (52) and arranged through the sliding groove (521), and an annular boss (531) is arranged on the peripheral wall of the positioning rod (53); and An elastic member (54) is sleeved on the outer periphery of the positioning rod (53) and connected between the groove bottom wall of the sliding groove (521) and the annular boss (531); Wherein, a positioning hole (511) is arranged on the side wall of the clamping plate (51), and the elastic member (54) is used for elastically pushing the annular boss (531) to make the positioning rod (53) inserted into the positioning hole (511).

10. A cryogenically resistant mass flowmeter as recited in claim 8, wherein, The insertion rod connecting assembly (6) comprises: An insertion rod (61) connected to the outer edge of the first sheath shell (21), an outwardly protruding limiting table (611) arranged on the outer end of the insertion rod (61), a radial through hole (612) arranged on the peripheral wall of the insertion rod (61), the through hole (612) extending axially through the limiting table (611) to make the insertion rod (61) form two elastically openable and closable clamping portions; and A limiting plate (62) connected to the outer edge of the second sheath shell (22), the limiting plate (62) being provided with a limiting hole (621) matched with the insertion rod (61); Wherein, the limiting table (611) is used for clamping the outer side of the limiting plate (62) when the insertion rod (61) is inserted into the limiting hole (621).

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