An ultrasonic gas meter for preventing flow field change

Abstract

The present invention relates to the technical field of ultrasonic gas meters, and specifically to an ultrasonic gas meter for preventing flow field changes, comprising an ultrasonic gas meter body, a protective assembly, a movable blocking plate, a deflection assembly and a limit return assembly. The protective assembly comprises a first airbag and a second airbag which are respectively located at the gas inlet and outlet ends of a measuring tube and are provided with inert gas. The movable blocking plate is rotatably installed inside the measuring tube. When the first airbag is compressed, the gas in the first airbag is used to drive the deflection assembly to move, so that the movable blocking plate is deflected to block the gas from passing through the measuring tube. The present invention has a monitoring and deterrent effect on illegal use of gas. When a wooden stick is inserted, the gas supply system stops running, which can effectively remind illegal users that their illegal behavior has been discovered, prevent them from further dangerous operations, ensure the standardization of gas use, and avoid safety accidents such as gas leakage and explosion caused by improper operation.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic gas meters, in particular to an ultrasonic gas meter capable of preventing flow field changes. Background Art

[0002] Ultrasonic gas meter is a device that uses ultrasonic technology to measure gas flow. It calculates the amount of gas flowing through the pipeline by sending and receiving ultrasonic signals. Compared with traditional mechanical gas meters, ultrasonic gas meters have the advantages of higher accuracy, wider range ratio, better stability and lower pressure loss.

[0003] When the gas meter is officially put into use, the gas from the main pipe enters the interior through the specially set air inlet pipe of the gas meter. Inside the gas meter, the gas flow, volume and other data will be accurately measured and recorded. After the counting process is completed, the gas will flow out steadily from the air outlet pipe on the gas meter, thereby providing energy support for the user's gas-using equipment to ensure its normal operation. However, there are some illegal users who take improper means to interfere with the normal counting function of the gas meter in order to seek improper benefits. They will choose to insert foreign objects such as wooden sticks at the air inlet of the gas meter. The insertion of wooden sticks greatly changes the originally stable and normal flow field state of the gas. When the gas flows through the area affected by the wooden stick, its flow rate, flow direction and pressure distribution are all disordered and abnormal. This abnormal flow field change makes it impossible for the gas meter to accurately measure and record the actual use of gas, thereby achieving the purpose of reducing the gas meter count and ultimately realizing the illegal attempt to expand the amount of gas that users can use. For this reason, we propose an ultrasonic gas meter that prevents flow field changes. Summary of the invention

[0004] In order to solve the above technical problems, the embodiment of the present application provides an ultrasonic gas meter for preventing flow field change, including an ultrasonic gas meter body, an inlet pipe and an outlet pipe are arranged at the top of the ultrasonic gas meter body, a measuring pipe is arranged inside the ultrasonic gas meter body and at the outlet end of the inlet pipe, an ultrasonic transducer is installed in the measuring pipe, and also includes:

[0005] A protection component, the protection component comprises a first airbag and a second airbag respectively located at the gas inlet and outlet ends of the measuring tube and provided with inert gas, the first airbag and the second airbag being connected via a connecting pipe;

[0006] A movable blocking plate is rotatably mounted inside the measuring tube;

[0007] A deflection assembly, the deflection assembly is used to connect the protection assembly and the movable blocking plate, and when the first airbag is compressed, the gas in the first airbag is used to drive the deflection assembly to move, so that the movable blocking plate is deflected to block the gas from passing through the measuring tube;

[0008] The limit return assembly is used to rotate the deflection assembly after the first airbag is released from pressure, so as to deflect the movable blocking plate to a state where the gas is no longer blocked from passing through the measuring tube.

[0009] In some embodiments, an outer tube is fixed to the periphery of the measuring tube, and a receiving cavity is provided between the inner wall of the outer tube and the outer wall of the measuring tube.

[0010] In some embodiments, convex tubes with an inner diameter equal to that of the measuring tube are symmetrically fixed at both ends of the measuring tube, and the first airbag and the second airbag are located in the corresponding convex tubes.

[0011] In some embodiments, the deflection assembly includes a connecting tube connected to the connecting tube and a connecting rod vertically fixed to the top of the movable blocking plate. The connecting rod can rotatably pass through the measuring tube, the connecting tube and the outer tube. A deflection plate is fixed on the outer wall of the connecting rod located in the inner part of the connecting tube.

[0012] In some embodiments, an air guide plate for guiding the gas to the deflection plate is connected inside the connecting pipe and located at the air inlet end.

[0013] In some embodiments, the connecting rod includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence from top to bottom, the first connecting portion and the third connecting portion have the same diameter, the diameter of the second connecting portion is smaller than the diameter of the first connecting portion, and the second connecting portion is located inside the connecting tube.

[0014] In some embodiments, the limit return assembly includes a first connecting plate fixed to the outer wall of the outer tube and a second connecting plate fixed to the first connecting part, and a spring is connected between the first connecting plate and the second connecting plate. In the natural state of the spring, the blocking plate is in a state of releasing the blocking gas from passing through the measuring tube.

[0015] In some embodiments, when the blocking plate is in a state of blocking the gas from passing through the measuring tube, the elastic force of the spring is smaller than the pushing force on the deflection plate when the pressurized first airbag releases gas.

[0016] In some embodiments, the first airbag and the second airbag are both in a conical shape, and the diameters of the first airbag and the second airbag both tend to gradually increase in the direction of gas flow.

[0017] In some embodiments, a movable limit strip is fixed to the outer wall of the second connecting portion in a direction of 90° with the deflection plate, and a stopper is fixed to the inner wall of the connecting tube to block the movable limit strip after deflection of 90°.

[0018] The present invention has at least the following beneficial effects:

[0019] 1. Safety monitoring and deterrence: It has a monitoring and deterrent effect on illegal use of gas (such as improper operations such as inserting foreign objects through the air intake pipe). When the wooden stick is inserted, the gas supply system stops running, which can effectively remind illegal users that their illegal behavior has been discovered, prevent them from further operations, ensure the standardization of gas use, and avoid safety accidents such as gas leaks caused by improper operations.

[0020] 2. Self-recovery ability: It has good self-recovery function. Once the wooden stick is pulled out, the airflow and airbag pressure in the intake pipe return to normal. Relying on the elastic recovery force of the spring, the relevant components can automatically return to their positions, allowing the movable blocking plate to release the blocking of the measuring tube. This allows the gas system to quickly return to a stable and normal operating mode, ensuring the normal supply of gas and meeting the normal usage needs of legitimate users in a timely manner.

[0021] 3. High working stability: After the wooden stick is pulled out, the gas can pass through the measuring tube smoothly again, which is very important for accurately measuring relevant parameters such as gas flow, which is conducive to the stable operation of the entire gas supply system and reduces system failures and inaccurate measurement caused by abnormal conditions.

[0022] 4. Improve accuracy: When the gas in the first airbag pushes the deflection plate to rotate, the fixed movable limit bar rotates synchronously with the rotation of the second connecting part. After rotating to degrees, the movable limit bar is blocked by the block, which can further play a limiting role to avoid excessive deflection and affect the normal blocking of the measuring tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the air intake pipe, the measuring pipe, the outer pipe and the protective assembly in the combined state of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the air intake pipe, the measuring pipe, the outer pipe and the protective assembly of the present invention in a disassembled state;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the measuring tube of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the position limiting and returning assembly, the protection assembly and the deflection assembly of the present invention in a combined state;

[0028] Figure 6 It is a schematic structural diagram of the deflection assembly and the movable blocking plate of the present invention;

[0029] Figure 7 is a schematic cross-sectional structural diagram of the deflection assembly of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the connecting rod and the position limiting and returning assembly of the present invention;

[0031] Fig. 9 It is a schematic diagram of the cross-sectional structure of the connecting pipe of the present invention.

[0032] In the figure: 1-ultrasonic gas meter body; 2-inlet pipe; 3-outlet pipe; 4-measuring pipe; 5-outer pipe; 6-convex pipe;

[0033] 7-limiting return assembly; 71-first connecting plate; 72-spring; 73-second connecting plate;

[0034] 8-protection component; 81-first airbag; 82-second airbag; 83-connecting pipe;

[0035] 9-deflection assembly; 91-connecting pipe; 92-connecting rod; 921-first connecting part; 922-second connecting part; 923-third connecting part; 93-deflection plate; 94-stopper; 95-air guide plate; 96-movable limit strip;

[0036] 10-ultrasonic transducer; 11-movable blocking plate. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figure 1-Figure 9As shown, the present invention provides a technical solution: an ultrasonic gas meter for preventing flow field change, comprising an ultrasonic gas meter body 1, an inlet pipe 2 and an outlet pipe 3 are arranged at the top of the ultrasonic gas meter body 1, a measuring tube 4 is arranged inside the ultrasonic gas meter body 1 and at the outlet end of the inlet pipe 2, an ultrasonic transducer 10 is installed in the measuring tube 4, two ultrasonic transducers 10 can be arranged relatively, one ultrasonic transducer 10 emits ultrasonic waves, and the other ultrasonic transducer 10 receives ultrasonic waves, and a signal processing unit is also arranged inside the ultrasonic gas meter body 1, which is responsible for converting the received ultrasonic signal into data that can be used to calculate the flow rate; a microprocessor: performs flow calculation and other other related operations; display module: displays measurement results and other information, such as cumulative flow, instantaneous flow, etc.; communication interface: used to connect external equipment or systems, such as data acquisition systems or remote monitoring centers; power supply module: provides power support for the entire system. The above is the prior art, and the specific structure and layout are not repeated here. In addition, it also includes a limited position return component 7, a protection component 8, a deflection component 9 and a movable blocking plate 11. The protection component 8 includes a first airbag 81 and a second airbag 82 which are respectively located at the inlet and outlet ends of the measuring tube 4 and are provided with inert gas. The first airbag 81 and the second airbag 82 are connected by a connecting pipe 83. In the initial state, the first airbag 81 and the second airbag 82 When the gas is squeezed, it is of a certain size and does not block the gas from passing through the measuring tube 4. The ultrasonic gas meter is debugged to a standard state when equipped with the first airbag 81 and the second airbag 82, which means that the existence of the first airbag 81 and the second airbag 82 will not have any effect on the measurement accuracy of the gas meter. Its measurement accuracy has reached the standard requirements. Even with the existence of these two airbags, stable and accurate measurement performance can be guaranteed, providing reliable guarantee for the accurate measurement of gas usage. Among them, the first airbag 81 and the second airbag 82 are both in a conical shape, and the first airbag 81 and the second airbag 82 show a trend of gradually increasing diameter in the direction of gas flow, so that in the gas flow direction, the gas meter is in a state of being ... When passing through, the conical shape design conforms to the natural flow characteristics of the fluid. Compared with the shape that changes suddenly, it can make the gas pass through the airbag more smoothly and reduce the airflow resistance. The movable blocking plate 11 can be rotatably installed inside the measuring tube 4. The deflection assembly 9 is used to connect the protection assembly 8 and the movable blocking plate 11. When the first airbag 81 is compressed, the gas in the first airbag 81 is used to drive the deflection assembly 9 to move, so that the movable blocking plate 11 is deflected to block the gas from passing through the measuring tube 4. The limit return assembly 7 is used to rotate the deflection assembly 9 after the first airbag 81 is released from pressure, so that the movable blocking plate 11 is deflected to a state where it releases the obstruction for the gas to pass through the measuring tube 4, so as to ensure the normal passage of the gas.

[0039] Secondly, an outer tube 5 is fixed on the periphery of the measuring tube 4, and a accommodating cavity is provided between the inner wall of the outer tube 5 and the outer wall of the measuring tube 4. The connecting tube 83 is arranged in the accommodating cavity, which can reduce the impact on the gas passing through the measuring tube 4. Convex tubes 6 with an inner diameter equal to that of the measuring tube 4 are symmetrically fixed at both ends of the measuring tube 4, and the first airbag 81 and the second airbag 82 are located in the corresponding convex tubes 6.

[0040] See also Figure 7-Figure 8 As shown, the limit return assembly 7 includes a first connecting plate 71 fixed to the outer wall of the outer tube 5 and a second connecting plate 73 fixed to the first connecting portion 921, and a spring 72 is connected between the first connecting plate 71 and the second connecting plate 73. When the spring 72 is in the natural state, the movable blocking plate 11 is in a state of releasing the blocking gas from passing through the measuring tube 4;

[0041] When the movable blocking plate 11 is in a state of blocking the gas from passing through the measuring tube 4 , the elastic force of the spring 72 is smaller than the pushing force on the deflection plate 93 when the pressurized first airbag 81 releases gas.

[0042] Among them, see Figure 6-Figure 9 As shown, the deflection assembly 9 includes a connecting tube 91 connected to the connecting tube 83 and a connecting rod 92 vertically fixed to the top of the movable blocking plate 11. The connecting rod 92 can rotatably pass through the measuring tube 4, the connecting tube 91 and the outer tube 5. A deflection plate 93 is fixed on the outer wall of the connecting rod 92 located in the inner part of the connecting tube 91. An air guide plate 95 for guiding the gas to the deflection plate 93 is connected inside the connecting tube 91 and at the air inlet end.

[0043] Through the above, when the wooden stick is inserted from the air intake pipe 2, the air flow channel structure inside the air intake pipe 2 and at the first airbag 81 will change immediately. Due to the intervention of the wooden stick, the relatively spacious channel at the first airbag 81 becomes narrow. According to the basic principles of fluid mechanics, when the gas passes through the narrowed channel, the pressure here increases. This increased pressure further squeezes the first airbag 81. Under the action of pressure, the originally expanded first airbag 81 gradually shrinks, and the gas inside it will be driven by the pressure difference and transported to the second airbag 82 through the connecting pipe 83 connected thereto.

[0044] During the gas delivery process, when the gas enters the connecting tube 91, the gas guide plate 95 designed inside the connecting tube 91 can guide and push the incoming gas to the deflection plate 93 on one side according to its specific shape and angle. Under the action of the gas thrust, the deflection plate 93 will be displaced, and the displacement of the deflection plate 93 will drive the connecting rod 92 connected thereto to rotate. The rotation of the connecting rod 92 will be transmitted to the movable blocking plate 11, causing it to deflect, and finally achieving the effect of blocking the gas from passing through the measuring tube 4. In this way, the normal use path of the gas is cut off, and the entire gas supply system cannot operate normally, thereby effectively reminding illegal users that their behavior has been monitored and restricted.

[0045] When the wooden stick is pulled out, the air flow state in the air intake pipe 2 returns to its initial state, and the pressure at the first airbag 81 also returns to its original state. At this time, due to the lack of gas thrust on the deflection plate 93, the spring 72, which was originally in a stretched state, will return to its original shape under the action of its own elastic restoring force. The recovery process of the spring 72 will drive the connecting rod 92 to rotate, and the rotation of the connecting rod 92 will prompt the movable blocking plate 11 to release the blocking state of the measuring tube 4. In this way, the gas can pass through the measuring tube 4 smoothly again, ensuring the normal supply of gas and the smooth progress of the measurement work, ensuring that the entire gas system returns to a stable and normal operating mode, meeting the normal use needs of legitimate users, and also maintaining the safety and standardization of gas use.

[0046] See also Figure 7-Figure 9 As shown, the connecting rod 92 includes a first connecting part 921, a second connecting part 922 and a third connecting part 923 which are connected in sequence from top to bottom. The diameters of the first connecting part 921 and the third connecting part 923 are the same, the diameter of the second connecting part 922 is smaller than the diameter of the first connecting part 921, and the second connecting part 922 is located inside the connecting tube 91. The small diameter of the second connecting part 922 can make the internal space of the connecting tube 91 larger, which is conducive to the passage of gas.

[0047] Among them, a rotatable sealing ring is provided at the connecting rod 92 passing through the measuring tube 4, the connecting tube 91 and the outer tube 5. The sealing ring plays a sealing role, which can prevent gas leakage and ensure sealing. At the same time, the rotatable design of the sealing ring allows the connecting rod 92 to rotate freely to a certain extent without damaging the sealing ring or affecting the sealing effect due to factors such as friction. The sealing ring can be in the form of a sealing lip made of rubber or other elastic materials, and its shape is generally an annular lip structure. The main function of the sealing lip is to form a sealing surface in close contact with the connecting rod 92 to prevent fluid leakage. For example, in the rotating shaft lip sealing ring, the sealing lip will fit tightly on the surface of the connecting rod 92. When the shaft rotates, the sealing lip can produce a certain change with the movement of the connecting rod 92, but always maintain a sealed state.

[0048] Example 2: Please refer to Figure 7 and Fig. 9 As shown, this embodiment is an extension of the embodiment 1: a movable limit strip 96 is fixed on the outer wall of the second connecting portion 922 and in a direction of 90° to the deflection plate 93, and a stopper 94 is fixed on the inner wall of the connecting tube 91 to block the movable limit strip 96 after deflection by 90°.

[0049] Through the above, when the gas push deflection plate 93 in the first airbag 81 rotates, the fixed movable limit strip 96 rotates synchronously with the rotation of the second connecting part 922. After rotating to 90 degrees, the movable limit strip 96 is blocked by the block 94, which can further play a limiting role to avoid excessive deflection and affect the normal blocking function of the measuring tube 4.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. An ultrasonic gas meter for preventing flow field change, comprising an ultrasonic gas meter body (1), wherein an inlet pipe (2) and an outlet pipe (3) are provided at the top of the ultrasonic gas meter body (1), a measuring pipe (4) is provided inside the ultrasonic gas meter body (1) and at the outlet end of the inlet pipe (2), an ultrasonic transducer (10) is installed in the measuring pipe (4), and the characteristics are as follows: Also included are: A protection component (8), the protection component (8) comprising a first air bag (81) and a second air bag (82) respectively located at the gas inlet and outlet ends of the measuring tube (4) and provided with inert gas, the first air bag (81) and the second air bag (82) being connected via a connecting pipe (83); A movable blocking plate (11) is rotatably mounted inside the measuring tube (4); A deflection assembly (9), the deflection assembly (9) being used to connect the protection assembly (8) and the movable blocking plate (11), and when the first airbag (81) is compressed, the gas in the first airbag (81) is used to drive the deflection assembly (9) to move, so that the movable blocking plate (11) is deflected to block the gas from passing through the measuring tube (4); The limit return assembly (7) is used to rotate the deflection assembly (9) after the first airbag (81) is released from pressure, so as to deflect the movable blocking plate (11) to a state where the gas is no longer blocked from passing through the measuring tube (4).

2. The ultrasonic gas meter for preventing flow field change according to claim 1, characterized in that: An outer tube (5) is fixed to the periphery of the measuring tube (4), and an accommodating cavity is provided between the inner wall of the outer tube (5) and the outer wall of the measuring tube (4).

3. The ultrasonic gas meter for preventing flow field change according to claim 1, characterized in that: Convex tubes (6) having an inner diameter equal to that of the measuring tube (4) are symmetrically fixed at both ends of the measuring tube (4), and the first airbag (81) and the second airbag (82) are located in the corresponding convex tubes (6).

4. The ultrasonic gas meter for preventing flow field change according to claim 1, characterized in that: The deflection assembly (9) comprises a connecting tube (91) connected to the connecting tube (83) and a connecting rod (92) vertically fixed to the top of the movable blocking plate (11); the connecting rod (92) rotatably passes through the measuring tube (4), the connecting tube (91) and the outer tube (5); a deflection sheet (93) is fixed on the outer wall of the inner part of the connecting tube (91) of the connecting rod (92).

5. The ultrasonic gas meter for preventing flow field change according to claim 4, characterized in that: An air guide plate (95) for guiding the gas to the deflection plate (93) is connected inside the connecting pipe (91) and located at the air inlet end.

6. The ultrasonic gas meter for preventing flow field change according to claim 4, characterized in that: The connecting rod (92) comprises a first connecting portion (921), a second connecting portion (922) and a third connecting portion (923) which are sequentially connected from top to bottom, the first connecting portion (921) and the third connecting portion (923) have the same diameter, the diameter of the second connecting portion (922) is smaller than the diameter of the first connecting portion (921), and the second connecting portion (922) is located inside the connecting tube (91).

7. The ultrasonic gas meter for preventing flow field change according to claim 6, characterized in that: The position limiting and returning assembly (7) comprises a first connecting plate (71) fixed to the outer wall of the outer tube (5) and a second connecting plate (73) fixed to the first connecting portion (921); a spring (72) is connected between the first connecting plate (71) and the second connecting plate (73); when the spring (72) is in a natural state, the blocking plate (11) is in a state of releasing the blocking of the gas from passing through the measuring tube (4).

8. The ultrasonic gas meter for preventing flow field change according to claim 7, characterized in that: When the blocking plate (11) is in a state of blocking the gas from passing through the measuring tube (4), the elastic force of the spring (72) is smaller than the pushing force exerted on the deflection plate (93) when the pressurized first airbag (81) releases gas.

9. The ultrasonic gas meter for preventing flow field change according to claim 1, characterized in that: The first airbag (81) and the second airbag (82) are both in a conical shape, and the first airbag (81) and the second airbag (82) both show a trend of gradually increasing diameter in the direction of gas flow.

10. The ultrasonic gas meter for preventing flow field change according to claim 6, characterized in that: A movable limit strip (96) is fixed on the outer wall of the second connecting portion (922) in a direction of 90° with the deflection plate (93), and a stopper (94) is fixed on the inner wall of the connecting tube (91) for blocking the movable limit strip (96) after deflection of 90°.

Images