Low-temperature-resistant precession vortex flowmeter sensor

Abstract

The utility model provides a low-temperature-resistant precession vortex flowmeter sensor which comprises a shell, a plurality of heating pieces, a filter screen and heat preservation cotton, and an inner cavity of the shell is sequentially connected with a vortex generator and a despinner in the flowing direction of fluid. The plurality of heating sheets are connected to the inner wall of the shell and are positioned on the upstream of the vortex generator; the filter screen is arranged in the shell and located between the heating piece and the vortex generator, and the heat preservation cotton wraps the peripheral wall of the shell. According to the low-temperature-resistant precession vortex flowmeter sensor provided by the utility model, the stability of the internal temperature of the sensor is ensured through the mutual cooperation of the heating sheet, the filter screen and the heat preservation cotton, so that the stability of the fluid state and the performance of an internal electronic detection element is ensured, the working capability of the sensor in a low-temperature environment is effectively improved, and the service life of the sensor is prolonged. And the measurement precision and reliability are improved.

Description

Technical Field

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

[0002] A vortex flow meter is an instrument that measures flow rate or velocity using the principle of oscillation. Its working principle involves adding a vortex initiator before a venturi tube to generate a vortex in the fluid. This vortex then passes through the venturi tube again, generating a secondary vortex. The frequency of the secondary vortex is proportional to the fluid velocity. Vortex flow meters are simple to operate, have high safety performance, a wide range, and strong anti-interference capabilities. They are widely used in flow measurement fields such as petroleum, chemical, power, metallurgy, and urban gas supply.

[0003] A typical vortex flowmeter sensor includes a housing and a vortex generator, a detection element, and a deswirl depletion device housed within it. Existing vortex flowmeter sensors still face numerous challenges in low-temperature operating environments, such as natural gas liquefaction and polar scientific sampling. Firstly, low temperatures can destabilize the performance of the electronic detection elements within the flowmeter sensor, altering the parameters of components like capacitors and resistors. This affects the accurate acquisition and processing of signals, leading to increased measurement errors. Secondly, the properties of the fluid itself change at low temperatures, such as increased viscosity or the presence of crystalline particles. This causes significant differences in the generation and development patterns of vortices compared to normal temperatures, further reducing the accuracy and reliability of the measurement. Utility Model Content

[0004] This utility model provides a low-temperature resistant vortex flowmeter sensor, which can ensure the stability of the internal temperature of the sensor, effectively improve the sensor's working ability in low-temperature environments, and improve the measurement accuracy and reliability.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a low-temperature resistant vortex flowmeter sensor is provided, comprising a housing, multiple heating elements, a filter screen, and insulation cotton. A vortex generator and a devortex generator are sequentially connected in the inner cavity of the housing along the fluid flow direction. Multiple heating elements are connected to the inner wall of the housing and are located upstream of the vortex generator. The filter screen is disposed inside the housing and is located between the heating elements and the vortex generator. The insulation cotton is wrapped around the outer peripheral wall of the housing.

[0006] In one possible implementation, a protective sleeve is also fitted on the outer peripheral wall of the shell. The protective sleeve includes two half-sleeves, one side of which is hinged together by a hinge, and the other side of which is connected by a fastener. The two half-sleeves can surround the outer periphery of the insulation cotton and tightly wrap the insulation cotton around the outer peripheral wall of the shell.

[0007] In some embodiments, a number of arc-shaped pressure plate groups are connected to the inner wall of the half-body. The number of arc-shaped pressure plate groups are arranged at intervals along the axial direction of the half-body. Each arc-shaped pressure plate group includes multiple arc-shaped pressure plates arranged at intervals along the circumference of the half-body. The arc-shaped pressure plates are connected to the half-body through a first elastic member.

[0008] In one possible implementation, a flexible clamping element is provided inside the housing, which is used to clamp the outer periphery of the inner end of the vortex generator.

[0009] In some embodiments, the flexible clamping member includes a mounting ring seat, a clamping ring, a plurality of damping sleeves, and a plurality of second elastic members. The mounting ring seat is disposed on the inner peripheral wall of the housing; the clamping ring clamps the outer periphery of the vortex generator and is coaxially disposed with the mounting ring seat; the plurality of damping sleeves are respectively connected between the clamping ring and the mounting ring seat, and the plurality of damping sleeves are arranged at intervals along the circumference of the mounting ring seat; the plurality of second elastic members are correspondingly sleeved on the outer periphery of the damping sleeves.

[0010] In one possible implementation, the housing includes a housing body and a displacement compensation mechanism connected to the inlet end of the housing body. The displacement compensation mechanism includes a flange pipe, an outer sleeve, and two seals. The flange pipe is coaxially disposed at the inlet end of the housing body, and the outlet end of the flange pipe has a displacement gap with the inlet end of the housing body. The outer sleeve is fitted around the outer periphery of the housing body and the flange pipe. The two seals are respectively disposed at the inlet end of the housing body and the outlet end of the flange pipe, and the seals can press against the inner wall of the outer sleeve.

[0011] In some embodiments, both the inlet end of the shell body and the outlet end of the flange pipe are provided with annular bosses. The outer sleeve includes a collar and two annular baffles. The collar is arranged around the outer periphery of the two annular bosses. The two annular baffles are respectively connected to the two ends of the collar. The two annular baffles are respectively sleeved on the outer periphery of the flange pipe and the shell body, and are located on the side of the annular bosses away from the displacement gap.

[0012] The sealing element is located on the annular boss and abuts against the inner circumferential wall of the collar.

[0013] In some embodiments, the annular boss has an arc-shaped protrusion on the side away from the displacement gap, and the annular baffle has an arc-shaped groove that matches the arc-shaped protrusion.

[0014] In some embodiments, the heating element is disposed on the inner peripheral wall of the flange tube, and the filter screen is disposed at the outlet end of the flange tube.

[0015] In some embodiments, the outer periphery of the filter screen is threaded to the inner circumferential wall of the flange tube, and a rotary handle is connected to the inner sidewall of the filter screen.

[0016] The beneficial effects of this low-temperature resistant vortex flowmeter sensor are as follows: Compared with the prior art, this low-temperature resistant vortex flowmeter sensor, after the fluid enters the housing, passes through a vortex generator and a devortex generator in sequence, causing the fluid to form a stable and regular vortex flow, ensuring the effective realization of the measurement principle. Furthermore, multiple heating elements heat the fluid entering the sensor, preventing changes in fluid characteristics due to low temperature from affecting the generation and development of vortices. The insulation cotton wrapped around the outer wall of the housing significantly reduces heat loss from the inside of the housing. Simultaneously, the filter effectively intercepts crystalline particles that appear in the fluid due to low temperature and extends their heating time at the housing inlet, resulting in more thorough heating. In the above structure, the cooperation of the heating elements, filter, and insulation cotton helps to ensure the stability of the sensor's internal temperature, thereby ensuring the stability of the fluid state and the performance of the internal electronic detection components, effectively improving the sensor's working capability in low-temperature environments and enhancing the measurement accuracy and reliability. Attached Figure Description

[0017] 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.

[0018] Figure 1 A cross-sectional view of a low-temperature resistant vortex flowmeter sensor provided for an embodiment of this utility model;

[0019] Figure 2 This is an embodiment of the present utility model. Figure 1 Enlarged structural diagram of section A in the middle;

[0020] Figure 3 A side view of the flexible clamping member provided in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the protective sleeve provided in an embodiment of the present utility model;

[0022] Figure 5 This is a side view of the protective sleeve provided in an embodiment of the present utility model.

[0023] The following are the labeling elements in the figure:

[0024] 1. Shell; 11. Shell body; 12. Annular boss; 121. Arc-shaped protrusion; 2. Vortex generator; 3. Devortex deflector; 4. Heating element; 5. Filter screen; 51. Rotary handle; 6. Insulation cotton; 7. Protective sleeve; 71. Half-sleeve; 711. Arc-shaped half-sleeve; 72. Arc-shaped pressure plate; 73. First elastic element; 8. Flexible clamping element; 81. Mounting ring seat; 82. Clamping ring; 83. Damping sleeve; 84. Second elastic element; 9. Displacement compensation mechanism; 91. Flange pipe; 92. Outer sleeve; 921. Collar ring; 922. Ring baffle; 93. Sealing element; 10. Converter; L. Displacement gap. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] Please refer to the following: Figures 1 to 5 The present invention provides a low-temperature resistant vortex flow meter sensor. The low-temperature resistant vortex flow meter sensor includes a housing 1, multiple heating elements 4, a filter screen 5, and insulation cotton 6. A vortex generator 2 and a deswirl de-energizer 3 are sequentially connected inside the housing 1 along the fluid flow direction. The multiple heating elements 4 are connected to the inner wall of the housing 1, and the heating elements 4 are located on the side of the vortex generator 2 near the inlet of the housing 1. The filter screen 5 is connected inside the housing 1, and the filter screen 5 is located between the heating elements 4 and the vortex generator 2.

[0028] This embodiment provides a low-temperature resistant vortex flowmeter sensor. After the fluid enters the housing 1, it passes sequentially through the vortex generator 2 and the devortex deflector 3, causing the fluid to form a stable and regular vortex flow, ensuring the effective realization of the measurement principle. Based on this, multiple heating elements 4 can heat the fluid entering the sensor, preventing changes in fluid characteristics due to low temperature from affecting the generation and development of vortices. The insulation cotton 6 wrapped around the outer wall of the housing 1 can significantly reduce heat loss from the inside of the housing 1. Simultaneously, the filter screen 5 can effectively intercept crystalline particles that appear in the fluid due to low temperature and extend their heating time at the inlet of the housing 1, resulting in a more thorough heating effect.

[0029] Compared with the prior art, the low-temperature resistant vortex flowmeter sensor provided by this utility model, through the cooperation of heating element 4, filter screen 5 and insulation cotton 6, helps to ensure the stability of the internal temperature of the sensor, thereby ensuring the stability of the fluid state and the performance of the internal electronic detection components, effectively improving the sensor's working ability in low-temperature environments, and improving the accuracy and reliability of measurement.

[0030] When measuring fluid flow rate, the fluid medium enters the housing 1 through a pipe. As the fluid passes through the vortex generator 2, vortices are generated. The frequency of the vortices is proportional to the fluid velocity. These vortices continue to flow along the axis of the housing 1. A sensor (such as a piezoelectric sensor) located downstream of the vortex generator 2 detects the frequency of the vortices and converts this frequency signal into an electrical signal, which is transmitted to the converter 10. The converter 10 processes the detected signal to obtain the fluid flow rate data, which is then displayed on a screen connected to the converter 10. When the fluid flows through the deswirl deflector 3, the deswirl deflector 3 uses its special structure (such as fixed blades or guide vanes) to convert the rotating flow into a straight flow, ensuring that the fluid maintains a stable flow state when entering the subsequent pipe.

[0031] In some embodiments, the outer periphery of the housing 1 is further provided with, for example, Figure 1 and Figure 4 , Figure 5 The structure shown is described in the following document. Figure 1 and Figure 4 , Figure 5 A protective sleeve 7 is also fitted on the outer peripheral wall of the housing 1. The protective sleeve 7 includes two half-sleeves 71. One side of the two half-sleeves 71 is hinged by a hinge, and the other side of the two half-sleeves 71 is connected by fasteners. The two half-sleeves 71 can surround the outer periphery of the insulation cotton 6 and make the insulation cotton 6 tightly wrap around the outer peripheral wall of the housing 1.

[0032] The protective sleeve 7 serves two purposes: firstly, it prevents external objects from directly impacting or scratching the insulation cotton 6 and the housing 1, avoiding mechanical damage that could reduce the insulation performance of the insulation cotton 6 or damage the housing 1, thus helping to extend the service life of the flow meter sensor. Secondly, the protective sleeve 7 itself also has a certain degree of heat insulation performance. When used in conjunction with the insulation cotton 6, it forms a double-layer insulation structure, further reducing heat loss to the external environment and helping to maintain a stable internal temperature of the flow meter sensor, ensuring its normal operation in low-temperature environments.

[0033] Furthermore, when the two half-body shells 71 are enclosed, the insulation cotton 6 can be tightly wrapped around the outer peripheral wall of the shell 1, preventing the insulation cotton 6 from shifting or loosening during use, ensuring good contact between the insulation cotton 6 and the shell 1, thereby maintaining a stable insulation effect.

[0034] Specifically, the protective sleeve 7 consists of two half-sleeves 71 that are hinged together. During installation, simply open the two half-sleeves 71 and fit them onto the shell 1 that has been wrapped with insulation cotton 6 from bottom to top. Then, fix the two half-sleeves 71 together with fasteners. No complicated operation or professional tools are required, which greatly improves the installation efficiency.

[0035] It should be noted that the converter 10 is connected to the top of the housing 1, and the insulation cotton 6 and insulation sleeve need to be positioned to avoid the installation location of the converter 10. Specifically, as shown below... Figure 4 As shown, an upwardly extending arc-shaped half-sleeve 711 can be provided on the upper edge of the half-sleeve 71. When the two half-sleeves 71 surround the outer periphery of the shell 1, the two arc-shaped half-sleeves 711 can simultaneously surround the outer periphery of the converter 10. Furthermore, thermal insulation cotton 6 can also be provided between the two arc-shaped half-sleeves 711 and the outer periphery of the converter 10 to further improve the thermal insulation effect.

[0036] In some embodiments, the protective sleeve 7 may be adopted as follows: Figure 4 and Figure 5 The structure shown is described in the following document. Figure 4 and Figure 5 Several sets of arc-shaped pressure plates 72 are connected to the inner wall of the half-body 71. The sets of arc-shaped pressure plates 72 are arranged at intervals along the axial direction of the half-body 71. Each set of arc-shaped pressure plates 72 includes multiple arc-shaped pressure plates 72 arranged at intervals along the circumference of the half-body 71. The arc-shaped pressure plates 72 are connected to the half-body 71 through the first elastic member 73.

[0037] When the protective sleeve 7 is installed on the housing 1 of different flow meter sensors, the outer diameter of the housing 1 may vary. In this case, the arc-shaped pressure plate 72 is connected to the half-sleeve 71 through the first elastic element 73. The first elastic element 73 can undergo elastic deformation, which can drive the arc-shaped pressure plate 72 to adjust its position according to the actual outer diameter of the housing 1, so that the protective sleeve 7 fits tightly against the housing 1 of different sizes, thereby enhancing the versatility and applicability of the protective sleeve 7.

[0038] It is important to understand that, due to differences in the manufacturing process of casing 1, such as Figure 1 As shown, the outer wall of the shell 1 may have a certain tilt angle, that is, the outer diameter of the shell 1 gradually decreases from its end to its middle. Therefore, multiple sets of arc-shaped pressure plates 72 are arranged at intervals along the axial direction of the half-body 71, so that each set of arc-shaped pressure plates 72 can independently adapt to the corresponding outer wall part of the shell 1, thereby better ensuring that the insulation cotton 6 is tightly attached to the outer wall of the shell 1, ensuring that there are no gaps between the insulation cotton 6 and the outer wall of the shell 1, and guaranteeing the insulation effect.

[0039] In some embodiments, the housing 1 and the vortex generator 2 are connected by a method such as Figure 1 The structure shown is described in the following document. Figure 1 The housing 1 is provided with a flexible clamping member 8, which is used to clamp the outer periphery of the inner end of the vortex generator 2.

[0040] During fluid flow, the vortex generator 2 is subjected to external forces such as the impact force of the fluid. The flexible clamping member 8 can effectively constrain the vortex generator 2, prevent it from shifting or shaking due to external forces and colliding with the inner wall of the housing 1, and ensure that it always stays in the correct position during long-term use, thus maintaining the normal operation of the flow meter sensor.

[0041] On the other hand, when fluid flows through the vortex generator 2 at high speed, it will generate a certain impact force and vibration. The flexible clamping component 8 has good elasticity and can play a buffering role, absorbing some of the energy generated by the fluid impact, reducing the impact force on the vortex generator 2, reducing the risk of damage due to impact, and helping to extend the service life of the flow meter sensor.

[0042] In some embodiments, the flexible clamping member 8 adopts, for example... Figure 1 and Figure 3 The structure shown is described in the following document. Figure 1 and Figure 3The flexible clamping component 8 includes a mounting ring seat 81, a clamping ring 82, a plurality of damping sleeves 83, and a plurality of second elastic elements 84. The mounting ring seat 81 is disposed on the inner peripheral wall of the housing 1; the clamping ring 82 is clamped on the outer periphery of the vortex generator 2 and is coaxially disposed with the mounting ring seat 81; the plurality of damping sleeves 83 are respectively connected between the clamping ring 82 and the mounting ring seat 81, and the plurality of damping sleeves 83 are arranged at intervals along the circumference of the mounting ring seat 81; the plurality of second elastic elements 84 are correspondingly sleeved on the outer periphery of the damping sleeves 83.

[0043] In this embodiment, the clamping ring 82 and the mounting ring seat 81 are coaxially arranged. With the cooperation of multiple damping sleeves 83 arranged circumferentially, it can ensure that the inner end of the vortex generator 2 is in a stable central position in the housing 1, avoiding its deviation or shaking during operation. This ensures the stability and uniformity of the fluid passing through the vortex generator 2, which is beneficial to improving the measurement accuracy of the fluid flow rate.

[0044] The damping sleeve 83, in conjunction with the second elastic element 84, can effectively dissipate vibration energy. When the vortex generator 2 vibrates due to fluid action or other factors, the above structure can convert the vibration energy into other forms of energy such as heat energy, thereby reducing the amplitude of vibration, increasing the stability of the vortex generator 2, and avoiding hard impacts on the vortex generator 2.

[0045] Specifically, the damping sleeve 83 can adopt the existing damping tube structure, as long as it can achieve the function of buffering vibration.

[0046] In some embodiments, the housing 1 may also employ, for example... Figure 1 and Figure 2 The structure shown is described in the following document. Figure 1 and Figure 2 The housing 1 includes a housing body 11 and a displacement compensation mechanism 9 connected to the inlet end of the housing body 11. The displacement compensation mechanism 9 includes a flange pipe 91, an outer sleeve 92, and two sealing elements 93. The flange pipe 91 is coaxially arranged at the inlet end of the housing body 11, and the outlet end of the flange pipe 91 has a displacement gap L with the inlet end of the housing body 11. The outer sleeve 92 is fitted around the outer periphery of the housing body 11 and the flange pipe 91. The two sealing elements 93 are respectively arranged at the inlet end of the housing body 11 and the outlet end of the flange pipe 91, and the sealing elements 93 can press against the inner wall of the outer sleeve 92.

[0047] In actual operation, due to changes in fluid temperature or ambient temperature, the shell body 11 and its connected pipes and other components will undergo thermal expansion and contraction. The displacement clearance L in the displacement compensation mechanism 9 provides expansion and contraction space for the shell body 11 and flange pipe 91 during thermal expansion and contraction, allowing them to move relative to each other within a certain range, avoiding excessive local stress that could damage the components, and ensuring the stability of the flow meter sensor.

[0048] On the other hand, vibrations may occur as the fluid flows through the flowmeter sensor. The displacement compensation mechanism 9 can buffer and absorb the displacement caused by these vibrations to a certain extent, reducing the impact of vibrations on the measurement accuracy and service life of the flowmeter sensor.

[0049] Specifically, the flange 91 facilitates the connection of the housing 1 to other pipes or equipment. The two seals 93 ensure the sealing of the connection and prevent fluid leakage. The outer sleeve 92 is fitted around the outer periphery of the housing 11 and the flange 91, enhancing the stability of the overall structure and providing support for the seals 93. Even with minor displacement of the housing 11 and the flange 91, the seals 93 can maintain a good seal and ensure a good sealing effect.

[0050] The above settings simplify the installation process, facilitate disassembly and maintenance, and enable the flow meter sensor to operate stably under various operating conditions, especially suitable for scenarios with temperature changes or vibrations.

[0051] In some embodiments, the outer casing 92 may be adopted as follows: Figure 2 The structure shown is described in the following document. Figure 2 The inlet end of the shell body 11 and the outlet end of the flange pipe 91 are both provided with annular bosses 12. The outer sleeve 92 includes a collar 921 and two annular baffles 922. The collar 921 is arranged around the outer periphery of the two annular bosses 12. The two annular baffles 922 are respectively connected to the two ends of the collar 921. The two annular baffles 922 are respectively sleeved on the outer periphery of the flange pipe 91 and the shell body 11, and are located on the side of the annular bosses 12 away from the displacement gap L. The sealing element 93 is provided on the annular bosses 12 and abuts against the inner peripheral wall of the collar 921.

[0052] It should be noted that sliding gaps are provided between the annular baffle 922 and the outer peripheral wall of the flange pipe 91, and between the other annular baffle 922 and the outer peripheral wall of the shell body 11, to ensure that the flange pipe 91 or the shell body 11 can expand and contract axially to accommodate the displacement requirements of thermal expansion and contraction. Based on this, the sealing element 93 provided on the annular boss 12 can precisely abut against the inner peripheral wall of the collar 921, forming a good sealing interface and effectively preventing fluid leakage from the aforementioned sliding gaps.

[0053] Specifically, the outer sleeve 92 is configured with a collar 921 and two ring baffles 922, which facilitates the connection between the outer sleeve 92 and the flange pipe 91 and the shell body 11, simplifying the installation operation. More specifically, the two ring baffles 922 are respectively connected to the two ends of the collar 921 by bolts.

[0054] Preferably, the annular boss 12 has an arc-shaped protrusion 121 on the side away from the displacement gap L, and the annular baffle 922 has an arc-shaped groove that matches the arc-shaped protrusion 121.

[0055] The combination of the arc-shaped protrusion 121 and the arc-shaped groove allows the annular boss 12 to form an arc-shaped surface contact with the annular baffle 922, thereby facilitating the relative rotation of the flange pipe 91 and the shell body 11 in the circumferential direction and adapting to the displacement requirements under different working conditions.

[0056] Meanwhile, with the seal 93 installed between the annular boss 12 and the collar 921, the tight fit between the arc-shaped protrusion 121 and the arc-shaped groove serves as an auxiliary sealing structure. The relatively small and uniform gap between them helps to prevent fluid leakage from the gap between the annular boss 12 and the ring baffle 922, forming an additional sealing barrier and further reducing the possibility of fluid leakage.

[0057] In some possible embodiments, see Figure 1 The heating element 4 is disposed on the inner circumferential wall of the flange tube 91, and the filter screen 5 is disposed at the outlet end of the flange tube 91.

[0058] In this embodiment, the vortex generator 2 and the devortex generator 3 are both located inside the shell body 11, while the heating element 4 and the filter screen 5 are located inside the flange pipe 91 at the inlet end of the shell 1. This reduces the axial dimension of the shell body 11 and makes the structure of the entire shell 1 more compact.

[0059] It should be noted that the heating element 4 is connected to an electric wire, which passes through the circumferential wall of the flange pipe 91 and extends outward. The extended end of the wire is connected to a thermostat. When the fluid temperature is lower than the set temperature, the thermostat activates the heating element 4 to directly heat the fluid, ensuring a stable flow. Specifically, multiple heating elements 4 are spaced apart along the circumference of the flange pipe 91 to improve the heating effect.

[0060] By placing the filter screen 5 at the outlet end of the flange pipe 91, it is possible to intercept the crystallized particles that appear in the fluid due to low temperature into the flange pipe 91. On the one hand, this facilitates the heating element 4 to heat it fully, and on the other hand, it effectively prevents the crystallized particles from entering between the annular boss 12 and the outer sleeve 92 and affecting the sealing performance of the seal 93.

[0061] In addition, the filter screen 5 can also be used to filter impurities in the fluid, preventing impurities from entering the housing body 11 and damaging precision components such as the vortex generator 2 and the devortex 3. This helps to ensure the accuracy of the measurement, while extending the service life of the flow meter sensor and reducing maintenance costs.

[0062] Preferably, the outer periphery of the filter screen 5 is threaded to the inner circumferential wall of the flange pipe 91, and a rotary handle 51 is connected to the inner side wall of the filter screen 5. By holding and rotating the rotary handle 51, the filter screen 5 can be easily disassembled and cleaned.

[0063] 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, precession vortex flowmeter sensor characterized by, The utility model relates to a kind of vortex generator and deswirler for fluid flow, including: Shell (1);The cavity of the shell (1) is sequentially connected with vortex generator (2) and deswirler (3) along fluid flow direction; Multiple heating fins (4) are connected to the inner wall of the shell (1), and located in the upstream of the vortex generator (2); Filter screen (5) is arranged in the shell (1), and is located between the heating fin (4) and the vortex generator (2);And Thermal cotton (6) is wrapped on the outer peripheral wall of the shell (1).

2. A low temperature resistant, precessional vortex flowmeter sensor as defined in claim 1, wherein, The outer peripheral wall of the shell (1) is further sleeved with protective sleeve (7), the protective sleeve (7) includes two half sleeve bodies (71), one side of two half sleeve bodies (71) is hinged by hinge, the other side of two half sleeve bodies (71) is connected by fastener, two half sleeve bodies (71) can be enclosed in the outer periphery of the thermal cotton (6) and make the thermal cotton (6) tightly wrapped on the outer peripheral wall of the shell (1).

3. A low temperature resistant, spinning vortex flowmeter sensor as defined in claim 2 wherein, The inner wall of the half sleeve body (71) is connected with a plurality of groups of arc abutting plates, a plurality of groups of the arc abutting plate group are spaced apart along the axial direction of the half sleeve body (71), each group of the arc abutting plate group includes a plurality of arc abutting plates (72) spaced apart along the circumferential direction of the half sleeve body (71), and the arc abutting plate (72) is connected with the half sleeve body (71) by the first elastic member (73).

4. A low temperature resistant, spinning vortex flowmeter sensor as defined in claim 1, wherein, The shell (1) is provided with a flexible clamping member (8), and the flexible clamping member (8) is used for clamping the outer periphery of the inner end of the vortex generator (2).

5. A low temperature resistant, spinning vortex flowmeter sensor as defined in claim 4 wherein, The flexible clamping member (8) includes: A mounting ring seat (81) is provided on the inner peripheral wall of the shell (1); A clamping ring (82) is clamped on the outer periphery of the vortex generator (2) and is coaxially arranged with the mounting ring seat (81); A plurality of damping sleeves (83) are respectively connected between the clamping ring (82) and the mounting ring seat (81), and a plurality of the damping sleeves (83) are spaced apart along the circumferential direction of the mounting ring seat (81);And A plurality of second elastic members (84) are correspondingly sleeved on the outer periphery of the damping sleeve (83).

6. A low temperature resistant, spinning vortex flowmeter sensor as defined in claim 1, wherein, The shell (1) includes a shell body (11) and a displacement compensation mechanism (9) connected to the inlet end of the shell body (11), and the displacement compensation mechanism (9) includes: A flange pipe (91) is coaxially arranged at the inlet end of the shell body (11), and the outlet end of the flange pipe (91) has a displacement gap (L) with the inlet end of the shell body (11); An outer sleeve (92) is sleeved on the outer periphery of the shell body (11) and the flange pipe (91);And Two sealing members (93) are respectively arranged at the inlet end of the shell body (11) and the outlet end of the flange pipe (91), and the sealing member (93) can abut on the inner wall of the outer sleeve (92).

7. A low temperature resistant, spinning vortex flowmeter sensor as defined in claim 6 wherein, The inlet end of the shell body (11) and the outlet end of the flange pipe (91) are provided with annular bosses (12), and the outer sleeve (92) includes: A sleeve ring (921) is annularly arranged on the outer periphery of the two annular bosses (12);And Two ring baffles (922) are connected to two ends of the sleeve ring (921), and the two ring baffles (922) are correspondingly sleeved on the outer periphery of the flange pipe (91) and the shell body (11) and located on the side of the annular boss (12) away from the displacement gap (L); The sealing element (93) is arranged on the annular boss (12), and the sealing element (93) abuts against the inner peripheral wall of the sleeve ring (921).

8. A low temperature resistant, spinning vortex flowmeter sensor as defined in claim 7 wherein, The side of the annular boss (12) away from the displacement gap (L) is provided with a circular-arc raised portion (121), and the ring baffle (922) is provided with an arc-shaped groove matched with the circular-arc raised portion (121).

9. A low temperature resistant, spinning vortex flowmeter sensor as defined in claim 6 wherein, The heating sheet (4) is arranged on the inner peripheral wall of the flange pipe (91), and the filter screen (5) is arranged at the outlet end of the flange pipe (91).

10. A low temperature resistant, spinning vortex flowmeter sensor as defined in claim 9 wherein, The outer periphery of the filter screen (5) is threadedly connected with the inner peripheral wall of the flange pipe (91), and a screw handle (51) is connected to the inner side wall of the filter screen (5).

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