Flow channel structure of ultrasonic metering instrument

Abstract

The utility model relates to a flow channel structure of an ultrasonic metering instrument. The metering structure is characterized by comprising a metering structure inlet and a metering flow channel which are sequentially connected, the metering structure inlet is of a horn mouth structure, the left and right sides of the inner wall of the horn mouth and the inner wall of the metering flow channel form certain angles, and the upper and lower sides of the inner wall of the horn mouth and the inner wall of the metering flow channel are coplanar; a plurality of rectiblocks are arranged in the metering flow channel, and the front ends of the rectiblocks are designed to be of an inclined plane gradient structure. A horn mouth type metering structure inlet can reduce the local pressure loss at the inlet, reduce the pressure drop and improve the product applicability; the structure of the front end of the rectiblock is designed to be a gradually-changed inclined plane, so that local pressure loss at the position can be improved, sudden change of a flow field at the position is reduced, and the flow field is further stabilized; the transition structure can realize the redistribution of the flow field, improve the distribution uniformity of the fluid in the pipeline before measurement, and improve the measurement precision; and the rectiblocks have certain angles, and corner angles of the structure are subjected to fillet treatment, so that demolding treatment of a model is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gas flow measurement field, concretely relates to an ultrasonic meter flow channel structure. BACKGROUND

[0002] In the field of gas metering technology, the accuracy and reliability of gas meter measurement are crucial to ensuring fair trade and gas safety. Ultrasonic gas meters are widely used due to their high precision, good stability, and long service life. The flow rate in the ultrasonic gas meter measurement area affects the propagation of ultrasonic signals, thereby affecting the measurement accuracy of the gas meter. The ultrasonic gas meter measurement structure, as one of the important components of the ultrasonic gas meter, has a significant impact on the stability of the flow field, measurement accuracy, and pressure loss. Therefore, to ensure the stability of the flow field in the measurement area, the flow channel in the measurement area is subjected to flow regulation. Chinese patent CN112534213A discloses a measurement structure for a gas meter, which has a certain flow regulation effect on the flow field in the flow channel. This paper proposes a new solution based on the same problem. For the problem of flow field stability, the flow field in the measurement area is in an unstable state in some flow sections, which causes precision problems in the measurement process.

[0003] Therefore, the utility model provides a new ultrasonic meter flow channel structure that can achieve stable flow in the flow channel. UTILITY MODEL CONTENT

[0004] In view of the problems in the prior art, the purpose of the utility model is to provide an ultrasonic meter flow channel structure.

[0005] The ultrasonic meter flow channel structure comprises a measurement structure inlet and a measurement flow channel connected in sequence, the measurement structure inlet is a horn mouth structure, the left and right sides of the inner wall of the horn mouth are at a certain angle with the inner wall of the measurement flow channel, and the upper and lower sides of the inner wall of the horn mouth are coplanar with the inner wall of the measurement flow channel; a plurality of flow straightening fins are arranged in the measurement flow channel, and the front end of the flow straightening fin is designed as a bevel gradual change structure.

[0006] The ultrasonic meter flow channel structure comprises a measurement structure inlet and a measurement flow channel connected in sequence, the measurement structure inlet is a horn mouth structure, the left and right sides of the inner wall of the horn mouth are at a certain angle with the inner wall of the measurement flow channel, and the upper and lower sides of the inner wall of the horn mouth are coplanar with the inner wall of the measurement flow channel; a plurality of flow straightening fins are arranged in the measurement flow channel, and the front end of the flow straightening fin is designed as a bevel gradual change structure.

[0007] The ultrasonic meter flow channel structure comprises a measurement structure inlet and a measurement flow channel connected in sequence, the measurement structure inlet is a horn mouth structure, the left and right sides of the inner wall of the horn mouth are at a certain angle with the inner wall of the measurement flow channel, and the upper and lower sides of the inner wall of the horn mouth are coplanar with the inner wall of the measurement flow channel; a plurality of flow straightening fins are arranged in the measurement flow channel, and the front end of the flow straightening fin is designed as a bevel gradual change structure.

[0008] The ultrasonic meter flow channel structure comprises a measurement structure inlet and a measurement flow channel connected in sequence, the measurement structure inlet is a horn mouth structure, the left and right sides of the inner wall of the horn mouth are at a certain angle with the inner wall of the measurement flow channel, and the upper and lower sides of the inner wall of the horn mouth are coplanar with the inner wall of the measurement flow channel; a plurality of flow straightening fins are arranged in the measurement flow channel, and the front end of the flow straightening fin is designed as a bevel gradual change structure.

[0009] The ultrasonic metering instrument flow channel structure is characterized in that the upper or lower surface of the metering flow channel is provided with metering module fixing bolts and bolt connection holes for fixing the metering module.

[0010] The ultrasonic metering instrument flow channel structure is characterized in that the metering flow channel is integrally injection molded, and the inner wall is designed as an inclined wall surface that facilitates demolding.

[0011] The ultrasonic meter flow channel structure is characterized in that the angle between the two surfaces of the inclined gradient structure is set to 4-6 degrees, and the flat surface of the rectifier plate is provided with an inclination angle of 0.2 degrees.

[0012] The flow channel structure of the ultrasonic metering instrument is characterized in that the rectifier mesh adopts a regular hexagonal structure, a circular hole structure, a rectangular structure, or a grid-like structure.

[0013] The ultrasonic metering instrument flow channel structure is characterized in that the straight section after the variable cross-section of the metering structure inlet is provided with a groove and a boss; the air inlet end of the transition structure is provided with a boss and the air outlet end of the transition structure is provided with a groove; the inlet end of the metering flow channel is provided with a boss; the groove can be fitted on the outer ring of the boss and the outer ring of the boss, and the groove can be fitted on the outer ring of the boss; the dimensions of the boss and the end face of the transition structure and the end face of the metering flow channel are consistent, ensuring that the inner walls of the metering structure inlet, the transition structure and the metering flow channel are coplanar after connection.

[0014] The ultrasonic meter flow channel structure is characterized in that the metering structure inlet, transition structure and metering flow channel are respectively provided with position-matching threaded holes. When the metering structure inlet is connected to the transition structure or the metering flow channel, or when the transition structure is connected to the metering flow channel, the chain link is fixed in the corresponding threaded hole by bolts to achieve a fixed connection between them.

[0015] Advantages of this utility model:

[0016] 1. The funnel-shaped metering inlet of this structure design can reduce local pressure loss at this point, reduce pressure drop, and improve the applicability of the product;

[0017] 2. The front end structure of the rectifier is designed with a gradually inclined surface, which can not only improve the local pressure loss at this point, but also reduce the abrupt change in the flow field, thereby further stabilizing the flow field.

[0018] 3. The addition of a transition structure to this design can redistribute the flow field, improve the uniformity of fluid distribution within the pipe before measurement, and enhance measurement accuracy.

[0019] 4. The addition of a transition structure to this design allows for the use of various structural variations, thus improving the product's versatility.

[0020] 5. This structure provides a more stable flow field distribution compared to existing technologies, improving the measurement repeatability of ultrasonic gas meters;

[0021] 6. This metering flow channel adopts an integrated injection molding structure, which can improve the production efficiency of the product and ensure the stability of product quality.

[0022] 7. The rectifier blades in this structure have a certain angle, and the corners of the structure are rounded, which is beneficial for the demolding process of the model; at the same time, it avoids stress concentration at the corners and improves the strength of the plastic part.

[0023] 8. This structure can combine two metering channels to achieve metering over a wide flow range, improve the applicability of gas meters, and reduce development costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall metering structure of an ultrasonic gas meter;

[0025] Figure 2 This is an exploded view of the metering structure of an ultrasonic gas meter.

[0026] Figure 3 It is an isometric view of the metering structure entrance;

[0027] Figure 4 This is a half-section view of the transition structure;

[0028] Figure 5 It is an isometric view of the metering flow channel;

[0029] Figure 6 This is a cross-sectional view of Example 1;

[0030] Figure 7 This is a schematic diagram of the overall structure of Example 2;

[0031] Figure 8 This is a schematic diagram of the overall structure of Example 2a;

[0032] Figure 9 This is a half-sectional view of the structure of Embodiment 3;

[0033] Figure 10 It is a view of the derived transition structure Figure 1 ;

[0034] Figure 11 It is a view of the derived transition structure Figure 2 ;

[0035] Figure 12 This is a schematic diagram of the overall structure of Example 4;

[0036] In the diagram: 1-round head bolt, 2-chain link, 3-transducer clip, 4-transducer, 5-transducer fixing hole, 6-metering channel, 7-transducer mounting structure, 8-transition structure, 9-metering structure inlet threaded hole, 10-metering structure inlet, 11-rectifier plate, 12-sloping gradient structure, 13-rectifier mesh, 14-bolt connection hole, 15-metering module fixing bolt, 16-metering channel outlet end, 17-metering channel fixing hole, 18-metering channel threaded hole, 19-combination fixing hole, 20-combination clip, 6a-bore three, 6b-end face two, 8a-groove two, 8b-bore two, 8c-end face one, 10a-bore one, 10b-groove one. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings:

[0038] The purpose of this invention is to stabilize the flow field characteristics of the metering module and improve the accuracy of the metering. It proposes a flow channel structure for an ultrasonic recording instrument. This structure has the characteristics of strong adaptability, simple structure, easy installation and positioning, good flow field stability, and high accuracy.

[0039] This utility model includes a metering structure inlet 10 and a metering channel 6 connected in sequence. The metering structure inlet 10 has a flared shape, with the left and right sides of the inner wall of the flared shape forming a certain angle with the inner wall of the metering channel 6, and the upper and lower sides of the inner wall of the flared shape being coplanar with the inner wall of the metering channel 6. The edges of the metering structure inlet 10 are rounded to smoothly transition the fluid and reduce local pressure loss. The metering channel 6 is provided with several flow straighteners 11 to achieve even distribution of fluid in this area. The front end of the flow straighteners 11 is designed with a gradually changing inclined structure, which helps to reduce local pressure loss and ensures a smooth fluid transition. A transition structure 8 can also be provided between the metering structure inlet 10 and the metering channel 6. The inner wall of the metering channel 6 is coplanar with the inner wall of the transition structure 8. The transition structure 8 is provided with a flow straightener 13 of a certain thickness, and the end face of the flow straightener is the same size as the straight section after the change of cross-section of the metering structure inlet 10, ensuring a smooth fluid transition. The flow straightener can be a regular hexagonal structure, a circular hole structure, a rectangular structure, or a grid structure.

[0040] The metering channel 6 has transducer mounting structures 7 on both sides of its outer wall, with a total of 4 mounting holes, which can realize dual-channel metering and testing; the transducer mounting structure 7 has transducer fixing holes 5 on both sides for connecting and fixing the transducer clips 3, which can realize dual-channel metering and testing.

[0041] The metering channel outlet 16 is connected to the gas meter tail pipe, and the metering channel 6 is provided with a metering channel fixing hole 17 for bolt connection with the gas meter tail pipe.

[0042] The upper or lower surface of the metering channel 6 is provided with a metering module fixing bolt 15 and a bolt connection hole 14 for fixing the metering module.

[0043] The metering channel 6 is integrally injection molded, and the inner wall is set as an inclined wall surface that facilitates demolding; the angle between the two sides of the inclined gradient structure 12 is set to 4-6 degrees, and the flat surface of the rectifier plate 11 is set with an inclined angle of 0.2 degrees.

[0044] The straight section after the variable cross-section of the metering structure inlet 10 is provided with a groove 10b and a boss 10a; the air inlet end of the transition structure 8 is provided with a boss 8b, and the air outlet end of the transition structure 8 is provided with a groove 8a; the inlet end of the metering channel 6 is provided with a boss 6a; the groove 10b can be fitted onto the outer ring of the boss 8b or the boss 6a, and the groove 8a can be fitted onto the outer ring of the boss 6a. The dimensions of the boss 10a are consistent with the end face 8c of the transition structure 8 and the end face 6b of the metering channel 6, ensuring that the inner walls of the metering structure inlet 10, the transition structure 8, and the metering channel 6 are coplanar after connection. In simple terms, it involves a male connector and a female connector; the male connector is inserted into the female connector, and after insertion, the inner walls are kept coplanar to reduce the internal resistance of the entire assembly structure.

[0045] The metering structure inlet 10, the transition structure 8 and the metering flow channel 6 are respectively provided with threaded holes of matching positions (including the metering structure inlet threaded hole 9, the metering flow channel threaded hole 18 and the transition structure threaded hole (not marked in the figure)). The setting position of the threaded holes is conventional technology in the field. Those skilled in the art know how to open the corresponding threaded holes to achieve the optimal connection between the metering structure inlet 10, the transition structure 8 and the metering flow channel 6 after they are nested together.

[0046] When the metering structure inlet 10 is connected to the transition structure 8 or the metering channel 6, the chain link is fixed in the corresponding threaded hole by bolts to achieve a fixed connection between them.

[0047] In threaded hole

[0048] The present invention will be further described below through different combinations: Example

[0049] Figure 6 This is a cross-sectional view of Example 1. The following description is based on the cross-sectional view:

[0050] The main structures in this embodiment include a metering inlet 10, a transition structure 8, and a metering flow channel 6.

[0051] Because the metering structure inlet 10 has a flared structure on both the left and right sides, transitioning from a large cross-section to a small cross-section, the fluid velocity will form high-speed zones on both sides. At this time, the fluid velocity after passing through the metering structure inlet 10 is non-uniformly distributed. Furthermore, since there is a non-axial velocity on the inclined surface of the metering structure inlet 10, this velocity will cause instability in the flow velocity in the metering zone. Therefore, this scheme designs a rectifier mesh 13.

[0052] In this embodiment, the rectifier mesh 13 inside the transition structure 8 adopts a regular hexagonal structure. This structure redistributes the fluid velocity brought by the metering structure inlet 10, making its velocity more evenly distributed to a certain extent; at the same time, it improves the fluid velocity caused by the variable cross-section, reducing its non-axial velocity.

[0053] The rectifier mesh 13 has a certain thickness. The thickness of the regular hexagonal structure is conducive to maintaining the direction of fluid redistribution after passing through the metering structure inlet 10, allowing the fluid itself to develop for a sufficient distance, which is beneficial to the stability of the fluid; an excessively thin rectifier mesh 13 is not conducive to the stable flow of the redistributed fluid.

[0054] The regular hexagonal structure in the rectifier mesh 13 is arranged in a staggered manner, which makes it easier for the regular hexagonal structure to occupy more space and reduce the dissipation of fluid between the holes.

[0055] The edge of the rectifier mesh 13 is still set as an incomplete regular hexagonal structure to ensure that the variable cross-section fluid after passing through the metering structure inlet 10 is more fully transmitted; the inner wall of the incomplete regular hexagonal channel and the inner wall of the transition structure 8 are coplanar, which further ensures the continuity of fluid transmission, reduces fluid dissipation, and local pressure loss.

[0056] The rectifier plate 11 in the metering channel 6 further redistributes the fluid in the vertical direction, making the fluid velocity in the area containing the transducer emitted sound waves more representative.

[0057] The rectifier 11 features a gradually tapered inclined structure 12 at its front end, with the angle on both sides set to approximately 5 degrees. This minimizes local pressure loss and helps to reduce the non-axial flow velocity generated by the fluid passing through this area, stabilizing the flow field in the metering region while improving metering accuracy. Each layer of rectifiers is designed in this manner. Obviously, the number of rectifiers is not unique.

[0058] The metering channel 6 can be injection molded in one piece, including transducer mounting holes, rectifier plates and fluid channels, reducing development costs and improving product applicability.

[0059] The flat surface of the rectifier 11 has a tilt angle of 0.2 degrees. This is intended to avoid affecting the fluid in the metering area and to facilitate demolding during one-piece injection molding. Example

[0060] Figure 7 This is a schematic diagram of the overall structure of Example 2. The main structures include the metering inlet 10 and the metering flow channel structure 6. The following description is based on the diagram:

[0061] The difference between this embodiment and embodiment 1 is that there is no transition structure 8, that is, no rectifier mesh structure.

[0062] In this embodiment, the redistribution of fluid in the metering area is achieved solely through the multilayer rectifier plate 11, thereby ensuring uniform fluid distribution.

[0063] In this embodiment, the sloped gradient structure 12 at the front end of the rectifier 11 reduces the velocity of the fluid in the non-axial direction in the metering area.

[0064] In this embodiment, the metering flow channel structure 6 can be directly connected to the metering structure inlet 10 as needed, and is bolted together by round head bolts 1 and chain link plates 2.

[0065] This embodiment lacks the transition structure 8 compared to embodiment 1, but still has a certain rectification structure. Obviously, the rectification effect of this scheme is not as obvious as that of embodiment 1.

[0066] This approach can still lead to similar structures, such as Figure 8 This is a schematic diagram of the overall structure of Example 2a.

[0067] This derivative scheme, compared to embodiment 1, also has a transition structure 8, but this scheme does not have a rectifier network structure.

[0068] The transition structure 8 in this scheme is a cavity. This design allows the fluid to stabilize itself; that is, it relies on the mutual shear force between the media to stabilize the fluid, thereby making the fluid in the metering area more stable and improving the metering accuracy.

[0069] Compared with Example 1, Example 2 differs in flow stability, but the local pressure loss of the structure in Example 2 is much less than that in Example 1. Example

[0070] Figure 9 This is a half-sectional view of the structure of Embodiment 3. The following description is based on the content of the figure:

[0071] The main structure of this embodiment includes a metering structure inlet 10, a transition structure 8, and a metering flow channel 6.

[0072] In this embodiment, the three main structures are connected by using round-headed bolts 1 and chain links 2.

[0073] The transition structure 8 presents a different rectification structure in this scheme. This scheme uses a circular orifice rectifier mesh to redistribute the fluid after passing through the metering structure inlet 10, making the fluid distribution within the metering area more uniform.

[0074] The edges of the circular orifice rectifier mesh structure still need to be designed as incomplete circular orifices to ensure that the fluid has a good transition when passing through this area, so as to avoid excessive pressure loss.

[0075] The rectifier mesh in this scheme can be derived into a bar-type rectifier structure, and the view of the derived transition structure is as follows: Figure 10 As shown.

[0076] The rectifier grid-derived rectifier structure in this scheme can be a rectifier grid structure with different density distributions. A view of the derived transition structure is shown below. Figure 11 As shown.

[0077] Similarly, a rectangular rectifier mesh structure can also be used, which will not be illustrated here. Both structures have a rectifying effect on the fluid coming from the metering structure inlet 10, and play a role in redistributing the fluid. Example

[0078] Figure 12 This is a schematic diagram of the overall structure of Example 4. The following description is based on the diagram:

[0079] The main purpose of this scheme is to achieve a combination of dual metering channels to accommodate a wider range of flow rates.

[0080] The two metering channels in this scheme are each equipped with a metering module and a transducer. Ultimately, the flow rate of the fluid in the channel is measured by integrating the two sets of data.

[0081] In this design, the lower surface of the metering channel 6 and the lower surface of the transition structure 8 are designed to be coplanar to ensure a full fit between the two metering channels.

[0082] The metering channel 6 in this design has four combined fixing holes 19 on both sides for the combined connection of two metering channels.

[0083] In this design, the connection and fixation of the two metering channels are achieved through the combination of snap-fit ​​20 during structural assembly.

[0084] Because the metering structure inlet 10 is flared on both sides, the two metering channels will not be affected when they are fitted together.

Claims

1. A flow channel structure for an ultrasonic metering instrument, characterized in that... It includes a metering structure inlet and a metering flow channel connected in sequence. The metering structure inlet is a flared structure. The left and right sides of the inner wall of the flared structure are at a certain angle to the inner wall of the metering flow channel. The upper and lower sides of the inner wall of the flared structure are coplanar with the inner wall of the metering flow channel. Several rectifiers are provided in the metering flow channel. The front end of the rectifier is designed as a sloped gradient structure.

2. The flow channel structure of an ultrasonic metering instrument according to claim 1, characterized in that... A transition structure is provided between the metering structure inlet and the metering flow channel, and a rectifier mesh of a certain thickness is provided inside the transition structure.

3. The flow channel structure of an ultrasonic metering instrument according to claim 1 or 2, characterized in that... The metering channel has transducer mounting structures on both sides of its outer wall, and transducer mounting structures have transducer fixing holes on both sides for connecting and fixing the transducer clips.

4. The flow channel structure of an ultrasonic metering instrument according to claim 1 or 2, characterized in that... The metering channel outlet end is connected to the gas meter tail pipe, and the metering channel is provided with a metering channel fixing hole for bolt connection with the gas meter tail pipe.

5. The flow channel structure of an ultrasonic metering instrument according to claim 1 or 2, characterized in that... The upper or lower surface of the metering channel is provided with metering module fixing bolts and bolt connection holes for fixing the metering module.

6. The flow channel structure of an ultrasonic metering instrument according to claim 1 or 2, characterized in that... The metering channel is integrally injection molded, and the inner wall is designed as an inclined wall surface to facilitate demolding.

7. The flow channel structure of an ultrasonic metering instrument according to claim 1 or 2, characterized in that... The angle between the two sides of the sloped gradient structure is set to 4-6 degrees, and the flat surface of the rectifier is tilted at a 0.2-degree angle.

8. The flow channel structure of an ultrasonic metering instrument according to claim 2, characterized in that... The rectifier mesh adopts a regular hexagonal structure, a circular hole structure, a rectangular structure, or a grid-like structure.

9. The flow channel structure of an ultrasonic metering instrument according to claim 2, characterized in that... The straight section after the variable cross-section of the metering structure inlet is provided with a groove and a boss; the air inlet end of the transition structure is provided with a boss and the air outlet end of the transition structure is provided with a groove; the inlet end of the metering channel is provided with a boss; the groove can be fitted on the outer ring of the boss and the outer ring of the boss, and the groove can be fitted on the outer ring of the boss. The dimensions of the boss and the end face of the transition structure and the end face of the metering channel are consistent, ensuring that the inner walls of the metering structure inlet, the transition structure and the metering channel are coplanar after connection.

10. The flow channel structure of an ultrasonic metering instrument according to claim 9, characterized in that... The metering structure inlet, transition structure, and metering channel are each provided with matching threaded holes. When the metering structure inlet is connected to the transition structure or metering channel, or when the transition structure is connected to the metering channel, the chain links are fixed in the corresponding threaded holes by bolts to achieve a fixed connection between them.

Images