Metering instrument

Abstract

The utility model provides a metering instrument, and relates to the technical field of metering equipment, the metering instrument comprises an upper shell, a joint and a lower shell, the forming material of the upper shell comprises an aluminum material, the forming material of the lower shell comprises a steel material with relatively low cost, and the two materials are combined, so that the reliability of the metering instrument is ensured, and the cost of the metering instrument is reduced. And the cost of the metering instrument is reduced. The upper shell and the connector are of an integrated structure, that is, the upper shell and the connector can be integrally formed, the forming procedure and the assembling procedure are simplified, the manufacturing cost is reduced, and the high binding strength is achieved. And the height size of the upper shell is smaller than that of the lower shell, so that forming materials with higher cost are reduced, the material cost is reduced, and the manufacturing cost of the metering instrument is further reduced under the condition of ensuring the performance and the reliability of the metering instrument.

Description

Technical Field

[0001] The present application relates to the technical field of metering equipment, and in particular to a metering instrument. Background Art

[0002] Measuring instruments are a general term for instruments that display numerical values. They are widely used in various fields such as industry, agriculture, and daily life, and play an important role in the operation of various industries. For example, gas meters have gradually become one of the indispensable devices in residential buildings.

[0003] Taking the gas meter as an example, the metering instrument usually includes an upper shell and a lower shell. The upper shell and the lower shell can be aluminum shells. The upper shell and the lower shell can be buckled together to form a receiving cavity for receiving various structural components of the meter. The end of the upper shell facing the lower shell can have a raised first waist seal portion, and the end of the lower shell facing the upper shell can have a raised second waist seal portion. Screw holes can be provided on the first waist seal portion and the second waist seal portion. The screws can be threadedly matched with the screw holes on the first waist seal portion and the second waist seal portion to achieve the fixing of the upper shell and the lower shell. The sealing is achieved by arranging a sealing ring between the screw and the screw hole.

[0004] However, the above-mentioned instrument has a problem of high manufacturing cost. Utility Model Content

[0005] The present application provides a measuring instrument that can reduce molding material costs and assembly processes, thereby lowering manufacturing costs.

[0006] A measuring instrument provided in the present application includes an upper shell, a joint and a lower shell. The molding material of the upper shell includes aluminum. The joint is arranged on the upper shell, and the joint and the upper shell are an integrated structure.

[0007] The molding material of the lower shell includes steel. The lower shell and the upper shell are connected to form an accommodating cavity. The joint is connected to the accommodating cavity, and the height dimension of the upper shell is smaller than the height dimension of the lower shell.

[0008] In a possible implementation, the meter further includes a protective cover, which is buckled on an outer surface of one side of the lower shell, and the protective cover and the outer surface of one side of the lower shell form a containing cavity.

[0009] The metering instrument also includes a control circuit board, which is located in the accommodating cavity.

[0010] In a possible implementation, the outer surface of one side of the lower shell includes a main body surface and a sealing surface, and the sealing surface is raised or recessed on the main body surface.

[0011] A first annular sealing rib is protruded on one surface of the shield facing the lower shell body, and the first sealing rib is arranged around the control circuit board.

[0012] The metering instrument also includes a first annular sealing member, which is arranged on the first sealing rib and abuts against the sealing surface.

[0013] In a possible implementation, the ratio of the height dimension of the upper shell to the height dimension of the lower shell is less than or equal to 1 / 4.

[0014] In a possible implementation, the thickness of the lower shell is smaller than the minimum thickness of the upper shell.

[0015] The ratio of the thickness dimension of the lower shell to the minimum thickness dimension of the upper shell is in the range of 0.5 to 0.125.

[0016] In a possible implementation, the upper shell includes a first shell portion and a first connecting portion, and the first connecting portion is disposed around the outer side of the first shell portion facing one end of the lower shell.

[0017] The lower shell includes a second shell portion and a second connecting portion. The second connecting portion is arranged around the outer side of the second shell portion facing one end of the upper shell. The first connecting portion and the second connecting portion abut against each other.

[0018] The measuring instrument also includes an annular connecting piece, a circumferential inner side wall of the connecting piece is provided with a clamping groove, and the connecting piece is clamped on the first connecting part and the second connecting part through the clamping groove.

[0019] The first connection part and the second connection part are filled in the card slot, and two opposite surfaces of the first connection part and the second connection part are respectively fitted and fixed to two side walls opposite to the card slot.

[0020] In a possible implementation manner, an annular first sealing groove is formed on one of two opposite surfaces of the first connecting portion and the second connecting portion.

[0021] The metering instrument further comprises an annular second sealing member, which is arranged in the first sealing groove, and the other of the two opposite surfaces of the first connecting portion and the second connecting portion is in close contact with the second sealing member.

[0022] In a possible implementation, a first mounting column is disposed on an outer surface of one side of the lower shell, a first mounting hole is formed on the first mounting column, and a second mounting hole is formed on the shield.

[0023] The metering instrument also includes a first fixing member and an annular third sealing member. One end of the first fixing member abuts against the third sealing member. The third sealing member abuts against the side of the second mounting hole facing away from the lower shell. The third sealing member is arranged around the second mounting hole.

[0024] The other end of the first fixing member passes through the third sealing member and the second mounting hole and matches with the first mounting hole.

[0025] In a possible implementation, a surface of the shield facing the lower shell has a protruding second mounting column, and a cavity is formed inside the second mounting column.

[0026] A through hole is provided on a surface of the shield facing away from the lower shell body, and the through hole is communicated with the cavity.

[0027] The second mounting column has a cavity bottom wall on the side facing away from the through hole, and a second mounting hole is opened on the cavity bottom wall. One end of the first fixing member and the third sealing member are located in the cavity, and the third sealing member is fitted and abutted against the cavity bottom wall, and the cavity bottom wall abuts against the first mounting column.

[0028] In a possible implementation, the meter further includes a sealing cap, which is disposed on the through hole and completely covers the through hole.

[0029] In a possible implementation, the shield has a battery compartment on a surface facing away from the lower shell, and the shield also includes a battery cover, which is disposed on the surface facing away from the lower shell and covers at least the battery compartment.

[0030] A second annular sealing rib is protruded on a surface of the battery cover facing the battery compartment.

[0031] A second annular sealing groove is provided on a surface of the shield facing away from the lower shell body, and the second sealing groove is arranged around the battery compartment.

[0032] The metering instrument also includes a fourth sealing component, which is arranged in the second sealing groove and is used for abutting against the second sealing rib.

[0033] In a possible implementation, the shield further has a plurality of positioning members on a surface facing the lower shell, and the plurality of positioning members are arranged around the outer side of the control circuit board.

[0034] The present application provides a metering instrument, which includes an upper shell, a joint and a lower shell, and the molding material of the upper shell includes aluminum, and the molding material of the lower shell includes relatively low-cost steel. By combining the two materials, the cost of the metering instrument is reduced on the basis of ensuring the reliability of the metering instrument. The upper shell and the joint are an integrated structure, that is, the upper shell and the joint can be integrally formed, which simplifies the molding process and the assembly process, and is also conducive to reducing the manufacturing cost. It has a strong bonding strength, which is further conducive to ensuring the reliability of the metering instrument. In addition, the height dimension of the upper shell is smaller than the height dimension of the lower shell, which reduces the molding materials with higher costs, reduces the molding material cost of the metering instrument, and further reduces the manufacturing cost of the metering instrument under the condition of ensuring the performance and reliability of the metering instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic diagram of the structure of a measuring instrument provided in an embodiment of the present application;

[0037] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the measuring instrument along the AA plane;

[0038] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the measuring instrument;

[0039] Figure 4 for Figure 2 A schematic diagram of the enlarged local structure of part A;

[0040] Figure 5 for Figure 1 Schematic diagram of the assembly of the upper shell and the lower shell in the measuring instrument;

[0041] Figure 6 for Figure 1 Schematic diagram of the inner structure of the protective cover in the measuring instrument;

[0042] Figure 7 for Figure 2 A magnified schematic diagram of the local structure of part B;

[0043] Figure 8 for Figure 1 Schematic diagram of the cross-sectional structure of the measuring instrument along the BB plane;

[0044] Figure 8a for Figure 8 A magnified schematic diagram of the local structure of part C in the middle;

[0045] Figure 8b for Figure 8 A schematic diagram of the enlarged local structure of part D in the middle;

[0046] Fig. 9 for Figure 1 Schematic diagram of the outer structure of the protective cover in the measuring instrument;

[0047] Fig.10 for Figure 1 A schematic diagram of the inner structure of a battery cover in a meter;

[0048] Fig.11 for Figure 8 A magnified view of the local structure of part E.

[0049] Description of reference numerals:

[0050] 100-Measuring instruments;

[0051] 10-upper housing; 11-joint; 12-first housing portion; 13-first connecting portion;

[0052] 20-lower housing; 20a-main body surface; 20b-sealing surface; 201-accommodating cavity; 21-second housing portion; 22-second connecting portion; 23-first mounting column; 231-first mounting hole;

[0053] 30-shield; 301-accommodating cavity; 31-first sealing rib; 32-second mounting column; 32a-cavity; 321-cavity bottom wall; 322-second mounting hole; 33-through hole; 34-battery compartment; 35-second sealing groove; 36-third mounting column; 361-third mounting hole; 37-positioning member; 38-support member; 381-support plane; 39-axial hole; 310-second clamping member; 311-first assembly hole; 312-second assembly hole;

[0054] 40-connecting member; 41-slot; 40a, 40b-side walls; 40c-main wall;

[0055] 50-control circuit board; 51-fourth mounting hole; 52-display module;

[0056] 60-first fixing member; 70-sealing cap;

[0057] 80 - battery cover; 81 - second sealing rib; 82 - rotating shaft; 83 - first clamping member;

[0058] 90-button; 110-first sealing member; 120-second sealing member; 130-third sealing member; 140-fourth sealing member; 150-display window;

[0059] 200-Battery. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] The embodiment of the present application provides a metering instrument for realizing the metering detection and numerical display of the flow of gas, electricity, etc. The metering instrument may include but is not limited to a gas meter, an electricity meter, etc.

[0062] In the embodiment of the present application, a gas meter is taken as an example for description.

[0063] Common measuring instruments include a case, which usually includes an upper shell and a lower shell, which are buckled together to form a accommodating cavity. For example, in the background technology described above, the first waist seal of the upper shell and the second waist seal of the lower shell can be fixed together by threaded fitting.

[0064] The metering instrument may also include structural components such as a metering module, a rectifier module, and a gas transmission module for realizing the functions of the meter. Such structural components may be located in the accommodating cavity.

[0065] An air inlet connector and an air outlet connector are provided on the upper shell, and the air inlet connector and the air outlet connector can be respectively connected to the accommodating cavity, so that the gas can enter the accommodating cavity through the air inlet connector, and the gas can be discharged from the air outlet connector after the metering is realized.

[0066] The material of the upper shell and the lower shell is usually the same, and the height of the upper shell and the lower shell is also consistent. For example, the material of the upper shell and the lower shell is usually aluminum. However, the material cost of aluminum is relatively high, which makes the manufacturing cost of the instrument higher.

[0067] In addition, in common gas meters, the upper shell and the joint are usually formed independently and then fixed and assembled by welding, riveting, etc. The assembly process is relatively complicated and also leads to high manufacturing costs.

[0068] Based on this, the embodiment of the present application provides a metering instrument, which includes an upper shell, a joint and a lower shell, and the molding material of the upper shell includes aluminum, and the molding material of the lower shell includes relatively low-cost steel. By combining the two materials, the cost of the metering instrument is reduced on the basis of ensuring the reliability of the metering instrument. The upper shell and the joint are an integrated structure, that is, the upper shell and the joint can be integrally formed, which simplifies the molding process and the assembly process, and is also conducive to reducing the manufacturing cost. It has a strong bonding strength, which is conducive to further ensuring the reliability of the metering instrument. In addition, the height dimension of the upper shell is smaller than the height dimension of the lower shell, which reduces the molding materials with higher costs, reduces the molding material cost of the metering instrument, and further reduces the manufacturing cost of the metering instrument while ensuring the performance and reliability of the metering instrument.

[0069] Figure 1 A schematic diagram of the structure of a measuring instrument provided in an embodiment of the present application.

[0070] See also Figure 1As shown, the meter 100 includes an upper shell 10 and a lower shell 20, and the upper shell 10 and the lower shell 20 are connected to form a receiving chamber 201 (refer to Figure 2 As shown in FIG. 1 , the accommodating cavity 201 can be used as the main accommodating space of the meter 100 to accommodate various structural components required for the meter 100 to realize its functions. For example, the metering module, the rectifier module and other components of the meter 100 are all located in the accommodating cavity 201 .

[0071] For example, the end surface of the upper shell 10 facing away from the lower shell 20 may be a plane, and the end surface of the lower shell 20 facing away from the upper shell 10 may also be a plane, and the direction perpendicular to these two planes is the height direction of the measuring instrument 100, such as Figure 1 The width direction and the length direction of the meter 100 may be perpendicular to the height direction, such as Figure 1 The x and y directions in .

[0072] The upper shell 10 has a connector 11, which can be located on an end surface of the upper shell 10 facing away from the lower shell 20. The connector 11 is connected to the accommodating cavity surrounded by the upper shell 10 and the lower shell 20, so that the gas to be measured object enters the accommodating cavity, so as to realize metering and detection functions through a metering module.

[0073] The number of the connectors 11 can be multiple, such as two connectors 11. Taking the meter 100 as a gas meter as an example, the two connectors 11 can be an inlet connector and an outlet connector, respectively. Of course, in some examples, when the meter 100 is another type of meter, the connector 11 can be one or more than two.

[0074] Among them, the molding material of the upper shell 10 is different from the molding material of the lower shell 20. The molding material of the upper shell 10 may include aluminum. For example, the upper shell 10 may be an aluminum die-cast plate structure formed by die-casting using an aluminum plate as a molding substrate.

[0075] The upper shell 10 and the connector 11 are an integrated structure, that is, the upper shell 10 and the connector 11 can be integrally formed, and the molding material of the connector 11 can be consistent with the molding material of the upper shell 10. The connector 11 is formed simultaneously in the process of forming the upper shell 10, so that the upper shell 10 and the connector 11 are an integrated structure. Compared with the upper shell 10 and the connector 11 being assembled after being independently molded, the molding process can be simplified, the assembly process can be omitted, the assembly process of the entire meter 100 can be reduced, and the manufacturing cost can be reduced. In addition, it can ensure that the connector 11 and the upper shell 10 have a strong bonding strength, which is conducive to improving the reliability of the meter 100.

[0076] For example, the joint 11 and the upper shell 10 may both be made of aluminum. For example, an aluminum plate is used as a molding substrate to integrally form the upper shell 10 and the joint 11 through die-casting.

[0077] The molding material of the lower shell 20 may include steel, so that the molding material of the lower shell 20 is different from that of the upper shell 10, and the molding material of the lower shell 20 is relatively low-cost steel, which ensures the reliability of the measuring instrument 100 and helps to reduce the cost of the entire measuring instrument 100.

[0078] For example, the molding material of the lower shell 20 may include galvanized steel, etc., so the lower shell 20 may be a shell structure formed by using a galvanized steel plate as a molding base material through mold processing and other methods.

[0079] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the measuring instrument along the AA plane.

[0080] See also Figure 2 As shown, the interior of the upper shell 10 can be surrounded by a chamber, and the interior of the lower shell 20 can also be surrounded by a chamber. The upper shell 10 and the lower shell 20 are fixed together, and the chamber of the upper shell 10 and the chamber of the lower shell 20 together constitute a accommodating chamber 201.

[0081] The height dimension of the upper shell 10 may be smaller than the height dimension of the lower shell 20, wherein the height dimension refers to the dimension in the height direction. The height dimension of the upper shell 10 may be the distance in the height direction between the end surface of the upper shell 10 facing away from the lower shell 20 and the end surface of the upper shell 10 and the lower shell 20 (such as the side of the first connecting portion 13 facing the second connecting portion 22), such as Figure 2 The height dimension of the lower shell 20 can be the distance in the height direction between the end surface of the lower shell 20 connected to the upper shell 10 (such as the side of the second connecting portion 22 facing the first connecting portion 13) and the end surface of the lower shell 20 facing away from the upper shell 10, such as Figure 2 In the embodiment of the present invention, the height dimension h1 of the upper shell 10 is smaller than the height dimension h2 of the lower shell 20. That is, the ratio range h1 / h2 of the height dimension h1 of the upper shell 10 and the height dimension h2 of the lower shell 20 may be smaller than 1.

[0082] That is, the material size required for molding the upper shell 10 (such as the required molding substrate area size, etc.) is smaller, and the material size required for molding the lower shell 20 is larger, and the cost of aluminum is higher than that of steel, that is, the high-cost materials are reduced, and the molding material cost of the meter 100 is reduced. Under the condition of ensuring the performance and reliability of the meter 100, the manufacturing cost of the meter 100 is further reduced.

[0083] For example, under the condition of satisfying the performance and reliability of the meter 100, the ratio of the size of the upper shell 10 to the size of the lower shell 20 can be made smaller. For example, the range of the ratio h1 / h2 of the height dimension h1 of the upper shell 10 and the height dimension h2 of the lower shell 20 can be less than or equal to 1 / 4, or the range of the ratio of the height dimensions can be less than 1 / 6. This allows the meter to have a lower manufacturing cost.

[0084] It should be noted that the height dimension of the upper shell 10 is smaller than the height dimension of the lower shell 20, and the depth dimension (dimension along the height direction) of the chamber enclosed inside the upper shell 10 may also be smaller than the depth dimension of the chamber enclosed inside the lower shell 20.

[0085] For example, the thickness of the lower shell 20 may be smaller than the minimum thickness of the upper shell 10. It should be noted that in the embodiment of the present application, the thickness of the lower shell 20 or the upper shell 10 refers to the shell wall thickness of the lower shell 20 or the upper shell 10. Figure 2 As shown in , taking the lower shell 20 as an example, the thickness dimension of the lower shell 20 can be as shown by L2 in the figure.

[0086] For example, the thickness of the lower housing 20 as a whole may be approximately uniform. The thickness of the upper housing 10 may be non-uniform. For example, the upper housing 10 may include a first housing portion 12 and a first connecting portion 13 (see Figure 4 As shown), the first connecting portion is used to achieve the connection and sealing between the upper shell 10 and the lower shell 20. The thickness of the first connecting portion can be greater than the thickness of the first shell portion to ensure the connection firmness and sealing. At this time, the minimum thickness of the upper shell 10 can be the thickness of the first shell portion 12. Figure 2 As shown, the minimum thickness dimension of the upper shell 10 can be as shown by L1 in the figure.

[0087] The thickness of the lower shell 20 is made smaller than the minimum thickness of the upper shell 10, such as L2<L1, which is beneficial to further reduce the material cost while ensuring the strength required by the measuring instrument.

[0088] Exemplarily, the ratio of the thickness of the lower shell 20 to the minimum thickness of the upper shell 10 may be in the range of 0.5 to 0.125. Alternatively, the ratio of the thickness of the lower shell 20 to the minimum thickness of the upper shell 10 may be in the range of 0.4 to 0.1, for example, the ratio of the thickness of the lower shell 20 to the minimum thickness of the upper shell 10 may be 0.4, so that the meter has a lower manufacturing cost.

[0089] Continue to see Figure 2As shown, the meter 100 may further include a shield 30, which is buckled on the outer surface of one side of the lower housing 20 (the chamber facing away from the lower housing 20). The shield 30 and the outer surface of one side of the lower housing 20 may enclose a receiving cavity 301. The receiving cavity 301 may be used to accommodate the control circuit board 50.

[0090] That is to say, the shield 30 is directly buckled and fixed on the outer surface of one side of the lower shell 20, that is, the shield 30 is directly connected and fixed to the lower shell 20, and forms a receiving cavity 301 with the outer surface of the lower shell 20. There is no need to set a protruding mounting seat on the outer surface of the lower shell 20 or the upper shell 10, so that a space for accommodating the control circuit board 50 is formed by the mounting seat and the shield 30, which further reduces the materials and molding and installation processes, and reduces the manufacturing cost.

[0091] The control circuit board 50 may be used to control the numerical display, etc. For example, a display module 52 (see Figure 3 As shown), the control circuit board 50 can be connected to the metering module, etc. The control circuit board 50 can control the display module 52 to display numerical values, etc. according to the detection result information transmitted by the metering module, etc.

[0092] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the measuring instrument.

[0093] See also Figure 3 As shown, the meter 100 may further include a display window 150, which may be disposed on the shield 30 (see Figure 1 ), for example, see Figure 3 As shown, the shield 30 may be provided with a first assembly hole 311 , and the display window 150 may be fixed on the first assembly hole 311 .

[0094] Illustratively, in the width direction, the display window 150 may at least partially overlap with the display module 52 , so that the user can conveniently observe information such as values ​​displayed by the display module 52 through the display window 150 .

[0095] The meter 100 may also include a button 90 (see Figure 1 As shown), the button 90 may also be disposed on the shield 30, for example, see Figure 3 As shown, the shield 30 may also be provided with a second assembly hole 312, and the button 90 may be assembled on the second assembly hole 312. For example, the button 90 may be inserted into the second assembly hole 312 and may be movable along the width direction to meet the user's needs of pressing and the like.

[0096] The button 90 may be connected to the control circuit board 50 . For example, the control circuit board 50 may identify operations such as pressing of the button 90 by the user to control the display module 52 to display numerical values ​​and the like.

[0097] A battery compartment 34 may be provided on a surface of the shield 30 facing away from the lower shell 20 . The battery compartment 34 is used to accommodate a battery 200 . The battery 200 may be connected to the control panel to provide power for the control panel and electronic components on the control panel.

[0098] The meter 100 may further include a battery cover 80 , which is mounted on a side of the shield 30 facing away from the lower shell 20 . The battery cover 80 may at least cover the battery compartment 34 , thereby protecting the battery 200 and electronic components such as connecting circuits in the battery compartment 34 .

[0099] See also Figure 3 As shown, the metering instrument 100 may also include a first seal 110, which may be a closed ring. The first seal 110 is used to achieve sealing of the connection between the protective cover 30 and the lower shell 20 to protect electronic components such as the control circuit board 50 and the display module 52 located in the accommodating cavity 301.

[0100] The metering instrument 100 may further include a second seal 120 , which may also be a closed ring. The second seal 120 is used to achieve sealing of the connection between the upper shell 10 and the lower shell 20 to protect electronic devices such as the metering module located in the accommodating cavity 201 .

[0101] The meter 100 may further include a third sealing member 130 . The third sealing member 130 may also be in a closed ring shape. The third sealing member 130 is also used to achieve sealing between the protective cover 30 and the lower shell 20 .

[0102] The meter 100 may further include a fourth seal 140 , which may also be a closed ring. The fourth seal 140 is used to seal the connection between the battery cover 80 and the protective cover 30 to protect electronic devices in the battery compartment 34 .

[0103] The materials of the first seal 110, the second seal 120, the third seal 130 and the fourth seal 140 may be the same, for example, the seals may be sealing rubber rings, sealing colloids, etc. Alternatively, the materials of the first seal 110, the second seal 120, the third seal 130 and the fourth seal 140 may not be completely the same.

[0104] The following example illustrates the assembly and sealing connection between the upper shell 10 and the lower shell 20 .

[0105] For example, see Figure 3As shown, the upper shell 10 may include a first shell portion 12 and a first connecting portion 13, wherein the cavity inside the upper shell 10 may be mainly surrounded by the first shell portion 12, and the first connecting portion 13 is located on the outer side of one end of the first shell portion 12 facing the lower shell 20 (the side facing away from the cavity of the upper shell 10), and surrounds the first shell portion 12 (refer to Figure 4 That is, the first connection portion 13 may be an annular structure protruding from the outer side of one end of the upper shell 10 facing the lower shell 20.

[0106] The lower shell 20 may include a second shell portion 21 and a second connecting portion 22. The cavity inside the lower shell 20 may also be mainly surrounded by the second shell portion 21. The second connecting portion 22 is located on the outer side of one end of the second shell portion 21 facing the upper shell 10 (the side facing away from the cavity of the lower shell 20) and surrounds the first shell portion 12 (refer to Figure 4 That is, the second connection portion 22 may be an annular structure protrudingly disposed on the outer side of one end of the lower shell 20 facing the upper shell 10 .

[0107] Continue to see Figure 3 As shown, the meter 100 may further include an annular connecting member 40 , and a slot 41 may be provided on the inner circumferential side wall of the connecting member 40 .

[0108] Figure 4 for Figure 2 A schematic diagram of the enlarged local structure of part A.

[0109] Combination Figure 4 As shown, for example, the connector 40 may include two opposite side walls, such as a side wall 40a and a side wall 40b, and the side wall 40a and the side wall 40b may be opposite in the height direction. The connector 40 may also include an annular main wall 40c, and the side wall 40a and the side wall 40b may also be annular structural members, and the side wall 40a and the side wall 40b may be located at both ends of the main wall 40c to form an annular connector 40 together, and a gap between the side wall 40a and the side wall 40b may form a slot 41.

[0110] After the upper shell 10 and the lower shell 20 are buckled together, the first connection part 13 of the upper shell 10 and the second connection part 22 of the lower shell 20 can be abutted against each other. The connector 40 can be arranged on the first connection part 13 and the second connection part 22 through the slot 41, so that the first connection part 13 and the second connection part 22 are filled (in the height direction) in the slot 41.

[0111] The side of the first connecting portion 13 facing away from the second connecting portion 22 can be fitted and fixed to the side wall 40a, and the side of the second connecting portion 22 facing away from the first connecting portion 13 can be fitted and fixed to the side wall 40b, so that the connecting member 40 is respectively fixed to the upper shell 10 and the lower shell 20, and the upper shell 10 and the lower shell 20 are fixedly assembled through the connecting member 40.

[0112] For example, during actual assembly, after the slot 41 of the connector 40 is clamped on the first connecting part 13 and the second connecting part 22, the connector 40, the upper shell 10 and the lower shell 20 can be fixed by riveting, such as placing the connector 40, the upper shell 10 and the lower shell 20 in a pressing mold, and using a press to rivet the side wall 40a of the slot 41, the first connecting part 13, the second connecting part 22 and the side wall 40b of the slot 41, so that the side wall 40a of the slot 41 is fixed to the first connecting part 13, and the side wall 40b is fixed to the second connecting part 22, thereby realizing the connection between the upper shell 10 and the lower shell 20.

[0113] An annular first sealing groove (not shown) may be provided on one of the two opposing surfaces of the first connecting portion 13 and the second connecting portion 22. The second sealing member 120 is disposed in the first sealing groove, and the other of the two opposing surfaces of the first connecting portion 13 and the second connecting portion 22 is in contact with the second sealing member 120.

[0114] For example, see Figure 4 As shown, a first sealing groove is provided on a surface of the first connection part 13 facing the second connection part 22, and a second sealing member 120 is disposed in the first sealing groove. When the first connection part 13 and the second connection part 22 are in contact with each other, a surface of the second connection part 22 facing the first connection part 13 is in contact with the first sealing member 110, and when the connection member 40 is clamped on the first connection part 13 and the second connection part 22 and fixed by riveting or the like, the second connection part 22 can be closely in contact with the second sealing member 120, thereby achieving a sealed connection between the upper shell 10 and the lower shell 20, ensuring the sealing of the accommodating cavity formed between the upper shell 10 and the lower shell 20, and ensuring the reliability and sealing of the measuring instrument.

[0115] Of course, in some examples, a first sealing groove can be opened on the surface of the second connecting part 22 facing the first connecting part 13, and the second sealing component 120 is arranged in the first sealing groove. When the first connecting part 13 and the second connecting part 22 are abutted and assembled, the surface of the first connecting part 13 facing the second connecting part 22 is tightly fitted and abutted against the second sealing component 120, so that a sealing effect can also be achieved.

[0116] The following example illustrates the assembly and sealing connection of the lower housing 20 and the protective cover 30 .

[0117] Figure 5 for Figure 1 Schematic diagram of the assembly of the upper shell and the lower shell in the measuring instrument.

[0118] To seal the control circuit board in the accommodating cavity formed by the shield and the lower shell, for example, see Figure 5 As shown, the outer surface of the side where the lower shell 20 is fixed to the shield may include a main body surface 20a and a sealing surface 20b, wherein the main body surface 20a may be arranged around the sealing surface 20b, and the sealing surface 20b may be recessed or raised relative to the main body surface 20a. For example, in the outer surface of the side where the lower shell 20 is fixed to the shield 30, a portion may be recessed or raised to form the sealing surface 20b, and the remaining portion may form the main body surface 20a. In the embodiment of the present application, the sealing surface 20b is recessed relative to the main body surface 20a (combined with the sealing surface 20b). Figure 8 ) as an example for explanation.

[0119] Figure 6 for Figure 1 A schematic diagram of the inner structure of the shield in a metering instrument. The inner side of the shield is the side of the shield facing the lower shell.

[0120] See also Figure 6 As shown, a first sealing rib 31 may be provided on the side of the shield 30 facing the lower shell, and the first sealing rib 31 may be in a closed ring shape. The first sealing rib 31 is convexly provided on the side of the shield 30 facing the lower shell. The first sealing rib 31 is provided around the control circuit board (not shown in the figure), that is, the control circuit board is enclosed in the first sealing rib 31 in the ring shape.

[0121] Figure 7 for Figure 2 A magnified schematic diagram of the local structure of part B.

[0122] See also Figure 7 As shown, the first sealing member 110 is disposed on the first sealing rib 31. When the shield 30 is buckled and fixed on the outer surface of one side of the lower housing 20, the first sealing member 110 on the first sealing rib 31 inside the shield 30 can be closely fitted and abutted against the sealing surface 20b of the lower housing 20. The shield 30 is sealed and connected with the lower housing 20, and the control circuit board 50 and other components enclosed in the first sealing rib 31 are sealed and protected.

[0123] The outer surface of the lower shell 20 is partially concave or convex to form a sealing surface 20b, and the area of ​​the sealing surface 20b in contact with the first seal 110 is reduced, which can help improve the flatness of the sealing surface 20b and further improve the sealing effect between the shield 30 and the lower shell 20.

[0124] Exemplarily, the first seal 110 can be fixed to the first sealing rib 31 by bonding, clamping, interference fit, threaded connection, etc. For example, a groove can be provided on the inner side of the first seal 110, and the groove can be distributed along the circumference of the first seal 110, and the raised first sealing rib 31 can partially extend into the groove of the first seal 110, and the groove and the first sealing rib 31 can be assembled by interference fit, so that the first seal 110 can be clamped on the first sealing rib 31 through the groove.

[0125] The shield 30 and the lower shell 20 can be fixed together by means of threaded fastening.

[0126] For example, a first mounting post 23 may be provided on the outer surface of the side where the lower housing 20 is fixed to the shield (see Figure 5 As shown), the first mounting column 23 may be protrudingly arranged on the side outer surface, and a first mounting hole 231 may be opened on the first mounting column 23.

[0127] The first mounting column 23 can be fixed on the outer surface of the lower shell 20 by welding, riveting or the like.

[0128] The shield 30 may be provided with a second mounting hole 322 (see Figure 6 shown).

[0129] Figure 8 for Figure 1 Schematic diagram of the cross-sectional structure of the measuring instrument along the BB surface.

[0130] See also Figure 8 As shown, the meter 100 may further include a first fixing member 60 (see Figure 3 As shown in the figure, one end of the first fixing member 60 can abut against the second mounting hole 322 of the shield 30, and the other end of the first fixing member 60 can pass through the second mounting hole 322 and cooperate with the first mounting hole 231 on the lower shell 20 to achieve fixed assembly between the shield 30 and the lower shell 20.

[0131] For example, the first mounting hole 231 may be a threaded hole with an internal thread on the inner wall. The outer wall of the other end of the first fixing member 60 may have an external thread that can cooperate with the internal thread, such as the first fixing member 60 may be a screw, a rivet, etc. The other end of the first fixing member 60 may pass through the second mounting hole 322 to achieve threaded cooperation with the first mounting hole 231.

[0132] During actual assembly, the shield 30 is buckled onto the lower shell 20, and the first seal 110 on the shield 30 fits with the sealing surface 20b of the lower shell 20. When the first fixing member 60 is rotated to fasten the first fixing member 60 with the first mounting hole 231, the first seal 110 can fit tightly with the sealing surface 20b under the pressing force of the first fixing member 60 to achieve a sealing effect.

[0133] There may be multiple first mounting columns 23 and first mounting holes 231, and multiple first mounting columns 23 and first mounting holes 231 may be located on the main body surface. Alternatively, multiple first mounting columns 23 and first mounting holes 231 may also be located on the sealing surface 20b. Alternatively, some first mounting columns 23 and first mounting holes 231 may be located on the main body surface, and some first mounting columns 23 and first mounting holes 231 may be located on the sealing surface 20b.

[0134] The number of the second mounting holes 322 and the number of the first mounting columns 23 may correspond to each other one by one, and there may be multiple second mounting holes 322. The multiple second mounting holes 322 may be distributed inside the annular first sealing rib 31, or may be distributed outside the annular first sealing rib 31. Alternatively, some of the second mounting holes 322 may be distributed inside the first sealing rib 31, and some of the second mounting holes 322 may be distributed outside the first sealing rib 31.

[0135] Figure 8a for Figure 8 Schematic diagram of the enlarged local structure of part C in the middle.

[0136] To enhance the sealing between the shield 30 and the lower housing 20, see Figure 8a As shown, the meter may further include a third seal 130 (see Figure 3 As shown in the figure, the third sealing member 130 is used to achieve sealing at the position of the first fixing member 60 and the second mounting hole 322, thereby ensuring the sealing effect between the shield 30 and the lower shell 20, and further improving the sealing performance of components such as the control circuit board. In particular, when part of the first mounting column 23 is located in the sealing surface and the first mounting hole 231 is located in the first sealing rib 31, the sealing performance at the matching position of the first fixing member 60 and the first mounting hole 231 and the second mounting hole 322 is poor, and there will also be a problem of affecting the sealing protection effect of the control circuit board. The third sealing member 130 can avoid this problem.

[0137] The third sealing member 130 may also be a closed ring, for example, a sealing rubber ring. The third sealing member 130 may be located on the side of the second mounting hole 322 facing away from the lower housing 20 , and the third sealing member 130 may be disposed around the second mounting hole 322 .

[0138] When the first fixing member 60 is matched with the first mounting hole 231 and the second mounting hole 322, see Figure 8a As shown, the third sealing member 130 is arranged between the first fixing member 60 and the second mounting hole 322, so that one end of the first fixing member 60 can be attached to the third sealing member 130, and the other end of the first fixing member 60 can pass through the third sealing member 130 and the second mounting hole 322 in sequence, and be threaded with the first mounting hole 231 of the first mounting column 23.

[0139] When the first fixing member 60 is rotated to tighten the first fixing member 60 and the first mounting hole 231, one end of the first fixing member 60 is tightly fitted against the third sealing member 130, and the third sealing member 130 is tightly fitted against the side of the second mounting hole 322 facing away from the lower shell body 20, thereby achieving the sealing performance at the connection position between the first fixing member 60 and the second mounting hole 322, and further improving the sealing effect of the connection between the shield 30 and the lower shell body 20.

[0140] In some examples, the second mounting hole 322 may be a through hole opened on a surface of the shield 30 facing away from the lower shell 20 , such as the second mounting hole 322 may penetrate the shield 30 in the width direction.

[0141] Figure 8b for Figure 8 Schematic diagram of the enlarged local structure of part D.

[0142] Or, in some examples, see Figure 8b As shown, the shield 30 may have a raised second mounting post 32 on the side facing the lower housing 20 (see Figure 6 As shown in FIG. 1 , the second mounting hole 322 may be provided on the second mounting column 32 .

[0143] A through hole 33 (see FIG. 2 ) may be provided on the side of the shield 30 facing away from the lower housing 20. Fig. 9 See Figure 8b As shown, the second mounting post 32 may have a cavity 32 a inside, and the through hole 33 may be in communication with the cavity 32 a inside the second mounting post 32 .

[0144] The second mounting column 32 may have a cavity bottom wall 321 on one side facing away from the through hole 33, and the second mounting hole 322 may be opened on the cavity bottom wall 321. The third sealing member 130 may be placed in the cavity 32a of the second mounting column 32 and abut against the cavity bottom wall 321 (see Figure 8a On the inner surface (the side facing the cavity 32a) of the housing 32 (as shown).

[0145] The first fixing member 60 can enter the cavity 32a of the second mounting column 32 through the through hole 33 on the shield 30, so that one end of the first fixing member 60 is also placed in the cavity 32a of the second mounting column 32, which can play a role in hiding and protecting the first fixing member 60.

[0146] The outer surface of the cavity bottom wall 321 of the second mounting column 32 (the side facing away from the cavity 32a) can abut against the first mounting column 23 on the lower shell 20, thereby ensuring that there is a larger accommodating cavity 201 between the shield 30 and the lower shell 20, and improving the strength of the shield 30.

[0147] Continue to see Figure 8b As shown, the metering instrument may further include a sealing cap 70 , which may be disposed on the through hole 33 of the shield 30 . The sealing cap 70 completely covers the through hole 33 . The sealing cap 70 may further hide the first fixing member 60 , thereby achieving an anti-disassembly function.

[0148] The sealing cap 70 can also play a sealing role, further ensuring the sealing effect at the position of the first fixing member 60.

[0149] It should be noted that when there are multiple second mounting holes 322, the through holes 33 on the shield 30 correspond to the number of the second mounting holes 322, and the number of through holes 33 is also multiple. The multiple through holes 33 may all be provided with sealing caps 70, or some of the through holes 33 may be provided with sealing caps 70, while some of the through holes 33 may not be provided with sealing caps 70. For example, when the through holes 33 are located at the bottom of the battery compartment 34 on the shield 30, the sealing cap 70 may not be provided.

[0150] The third sealing member 130 may be disposed between each of the plurality of second mounting holes 322 and the first fixing member 60, or the third sealing member 130 may be disposed between some of the second mounting holes 322 and the first fixing member 60, and the third sealing member 130 may not be disposed between some of the second mounting holes 322 and the first fixing member 60. For example, when the through hole 33 has a sealing cap 70, the sealing cap 70 may play a sealing role, and the third sealing member 130 may not be disposed between the second mounting hole 322 corresponding to the through hole 33 and the first fixing member 60, and the sealing effect can also be ensured.

[0151] There are many ways to assemble the sealing cap 70 and the through hole 33 of the shield 30. For example, the sealing cap 70 can be arranged in the through hole 33 by interference fit. Alternatively, the sealing cap 70 can also be fixedly assembled on the through hole 33 by means of snap connection, adhesive connection, etc.

[0152] The shield 30 and the control circuit board can also be assembled and fixed by screw fastening. For example, a raised third mounting column 36 (see Figure 6 As shown), the third mounting column 36 may be provided with a third mounting hole 361.

[0153] The control circuit board may be provided with a fourth mounting hole 51 (see Figure 3 As shown), the fourth mounting hole 51 can pass through the through hole of the control circuit board.

[0154] The metering instrument may also include a second fixing member (not shown in the figure), one end of which may abut against the control circuit board, and the other end of the second fixing member may pass through the fourth mounting hole and cooperate with the third mounting hole to realize the assembly of the control circuit board and the protective cover.

[0155] For example, the third mounting hole 361 may be a threaded hole with an internal thread on the inner wall, and the outer wall of the other end of the second fixing member may have an external thread that can cooperate with the internal thread, such as the second fixing member may be a screw, a rivet, etc. The other end of the second fixing member can pass through the fourth mounting hole 51 to achieve threaded cooperation with the third mounting hole 361.

[0156] To facilitate the assembly of the control circuit board and the shield 30, continue to refer to Figure 6 As shown, a plurality of positioning members 37 may be provided on the side of the shield 30 facing the lower shell, and the plurality of positioning members 37 may be provided around the outer side of the control circuit board. The positioning members 37 may play an auxiliary positioning role. When installing the control circuit board, the positioning members 37 may be used to pre-position the control circuit board, so as to facilitate accurate alignment of the second fixing member with the third mounting hole and the fourth mounting hole, so as to realize assembly and fixation of the control circuit board and the shield, and thus improve assembly efficiency.

[0157] Exemplarily, the shield 30 may also have a protruding support member 38 on the side facing the lower shell, and the support member 38 may have a support plane 381 on the side facing away from the shield 30. The positioning member 37 may be protrudingly arranged on one side of the support plane 381, so that the positioning member 37 and the support member 38 may form an L-shaped structural member. The support member 38 may support the control circuit board, so that the control circuit board may be arranged on the support plane 381, and the positioning member 37 may be located outside the control circuit board to achieve positioning of the control circuit board.

[0158] The positioning member 37 and the supporting member 38 may be an integrated structural member, or the positioning member 37 and the supporting member 38 may be formed separately and then assembled together.

[0159] The number of positioning members 37 and supporting members 38 may correspond to each other, for example, each positioning member 37 may be disposed on a supporting member 38. Alternatively, in some examples, among the plurality of positioning members 37, some positioning members 37 may be disposed on supporting members 38, and some positioning members 37 may not be disposed on corresponding supporting members 38.

[0160] The following example shows how the shield and battery cover are assembled and sealed.

[0161] The battery cover is assembled on the side of the shield facing away from the lower shell and covers the battery compartment, wherein the battery cover and the shield can be assembled in various ways, for example, the battery cover can be assembled with the shield by threaded connection, snap fit, interference fit, etc.

[0162] For example, to facilitate replacement of batteries in the battery compartment, the battery cover may be mounted on the shield by a hinged connection.

[0163] Fig. 9 for Figure 1 The schematic diagram of the outer structure of the shield in the metering instrument is shown in FIG. The outer side of the shield is the side of the shield facing away from the lower shell.

[0164] See also Fig. 9 As shown, for example, an axial hole 39 can be formed at opposite ends on one side of the shield 30. For example, two axial holes 39 can be opened on one of the opposite sides along the length direction (y direction) of the shield 30, and the two axial holes 39 can be distributed on both ends of the shield 30 along the height direction (z direction).

[0165] Fig.10 for Figure 1 The schematic diagram of the inner structure of the battery cover in the meter of FIG. The inner side of the battery cover 80 is the side of the battery cover 80 facing the shield.

[0166] See also Fig.10 As shown, a rotating shaft 82 capable of cooperating with the shaft hole can be provided at two opposite ends on one side of the battery cover 80. For example, two rotating shafts 82 can be provided on one of the two opposite sides along the length direction of the battery cover 80, and the two rotating shafts 82 can be distributed on both ends of the battery cover 80 along the height direction.

[0167] One side of the battery cover 80 can be set on one side of the shield 30 by the rotation of the rotating shaft 82 and the shaft hole 39, so that the battery cover 80 can rotate relative to the shield 30, thereby realizing the opening and closing of the battery cover 80 and the shield 30. For example, by rotating the other side of the battery cover 80 so that the other side of the battery cover 80 rotates away from the shield 30, the battery cover 80 can be opened relative to the shield 30 to expose the battery compartment 34. By rotating the other side of the battery cover 80 so that the other side of the battery cover 80 rotates toward the shield 30 and finally covers the battery compartment 34, the battery cover 80 can be closed relative to the shield 30.

[0168] A first clip 83 may also be provided at two opposite ends on the other side of the battery cover 80. For example, two first clips 83 may be provided on the other side of the battery cover 80 along the length direction. The two first clips 83 may be distributed at both ends of the battery cover 80 along the height direction.

[0169] The shield 30 may be provided with second clips 310 (see FIG. Fig. 9 As shown), the first clamping member 83 and the second clamping member 310 cooperate to realize the snap-fit ​​fixation of the other side of the battery cover 80 with the protective cover 30, which is convenient for fixing the battery cover 80 when the battery cover 80 is closed, and also helps to improve the operational convenience when opening the battery cover 80.

[0170] When the other side of the battery cover 80 is rotated to close the battery cover 80 relative to the protective cover 30, the first clamping member 83 on the other side of the battery cover 80 can be snap-fitted with the second clamping member 310 on the protective cover 30, so that the battery cover 80 and the protective cover 30 are snap-fitted and fixed.

[0171] When the battery cover 80 needs to be opened, force can be applied to separate the first clamping member 83 from the second clamping member 310 , and the battery cover 80 can be rotated.

[0172] Among them, the first clamping member 83 and the second clamping member 310 can be a barb and snap-fit ​​structure, or the first clamping member 83 and the second clamping member 310 can also be grooves and protrusions that can achieve interference fit, or the first clamping member 83 and the second clamping member 310 can also be other structural members that can achieve snap fit.

[0173] To achieve the seal between the shield 30 and the battery cover 80, continue to refer to Fig.10 As shown, a raised second sealing rib 81 may be provided on the surface of the battery cover 80 facing the battery compartment 34 (or the protective cover 30 ), and the second sealing rib 81 may be a closed annular structure.

[0174] A second sealing groove 35 is provided on the side of the shield 30 facing away from the lower housing 20 (see Fig. 9 As shown), the second sealing groove 35 can be a closed ring, and the second sealing groove 35 is arranged around the battery compartment 34, that is, the second sealing groove 35 surrounds the battery compartment 34.

[0175] The fourth sealing member (not shown in the figure) is disposed in the second sealing groove 35 , so that the fourth sealing member 140 surrounds the battery compartment 34 .

[0176] Fig.11 for Figure 8 A magnified view of the local structure of part E.

[0177] When the battery cover 80 is fastened to the protective cover 30, see Fig.11 As shown, the second sealing rib 81 on the battery cover 80 can closely fit and abut against the fourth sealing member 140 around the battery compartment 34 to achieve sealing between the battery cover 80 and the protective cover 30 and provide sealing protection for the battery compartment 34 .

[0178] The numerical values ​​and numerical ranges involved in the embodiments of the present application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0179] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A measuring instrument, characterized in that: include: An upper shell, wherein the molding material of the upper shell includes aluminum; A connector, wherein the connector is disposed on the upper shell, and the connector and the upper shell are an integrated structure; The lower shell is formed of a material including steel, the lower shell and the upper shell are connected to form a receiving cavity, the joint is connected to the receiving cavity, and the height dimension of the upper shell is smaller than the height dimension of the lower shell.

2. The measuring instrument according to claim 1, characterized in that: It also includes a shield, which is buckled on the outer surface of one side of the lower shell, and the shield and the outer surface of one side of the lower shell form a receiving cavity; The metering instrument further comprises a control circuit board, and the control circuit board is located in the accommodating cavity.

3. The measuring instrument according to claim 2, characterized in that: The outer surface of one side of the lower shell includes a main body surface and a sealing surface, and the sealing surface is convex or concave on the main body surface; A first annular sealing rib is protruded from a surface of the shield facing the lower shell, and the first sealing rib is arranged around the control circuit board; The metering instrument further comprises a first annular sealing member, which is arranged on the first sealing rib and abuts against the sealing surface.

4. The measuring instrument according to any one of claims 1 to 3, characterized in that: The ratio of the height dimension of the upper shell to the height dimension of the lower shell is less than or equal to 1 / 4.

5. The measuring instrument according to any one of claims 1 to 3, characterized in that: The thickness dimension of the lower shell is smaller than the minimum thickness dimension of the upper shell; The ratio of the thickness of the lower shell to the minimum thickness of the upper shell is in the range of 0.5 to 0.

125.

6. The measuring instrument according to any one of claims 1 to 3, characterized in that: The upper shell comprises a first shell portion and a first connecting portion, wherein the first connecting portion is disposed around the outer side of the first shell portion facing one end of the lower shell; The lower shell comprises a second shell portion and a second connecting portion, the second connecting portion is arranged around the outer side of the second shell portion facing one end of the upper shell, and the first connecting portion and the second connecting portion are in contact with each other; The meter further comprises an annular connecting member, the circumferential inner side wall of the connecting member is provided with a clamping groove, and the connecting member is clamped on the first connecting portion and the second connecting portion through the clamping groove; The first connection portion and the second connection portion are filled in the card slot, and the two opposite surfaces of the first connection portion and the second connection portion are respectively fitted and fixed to the two opposite side walls of the card slot.

7. The measuring instrument according to claim 6, characterized in that: A first annular sealing groove is provided on one of the two opposite surfaces of the first connecting portion and the second connecting portion; The metering instrument further comprises an annular second sealing member, the second sealing member is arranged in the first sealing groove, and the other of the two opposite surfaces of the first connecting portion and the second connecting portion is in close contact with the second sealing member.

8. The measuring instrument according to claim 2 or 3, characterized in that: A first mounting post is provided on an outer surface of one side of the lower shell, a first mounting hole is provided on the first mounting post, and a second mounting hole is provided on the shield; The metering instrument further comprises a first fixing member and an annular third sealing member, one end of the first fixing member is fitted and abutted against the third sealing member, the third sealing member is fitted and abutted against a side of the second mounting hole facing away from the lower shell, and the third sealing member is arranged around the second mounting hole; The other end of the first fixing member passes through the third sealing member and the second mounting hole and matches with the first mounting hole.

9. The measuring instrument according to claim 8, characterized in that: The shield has a protruding second mounting column on one side facing the lower shell, and the second mounting column has a cavity inside; A through hole is formed on a surface of the shield facing away from the lower shell, and the through hole is in communication with the cavity; The second mounting column has a cavity bottom wall on a side facing away from the through hole, the cavity bottom wall is provided with the second mounting hole, one end of the first fixing member and the third sealing member are located in the cavity, the third sealing member is fitted and abutted against the cavity bottom wall, and the cavity bottom wall abuts against the first mounting column; The meter further comprises a sealing cap, which is arranged on the through hole and completely covers the through hole.

10. The measuring instrument according to claim 2 or 3, characterized in that: The shield has a battery compartment on one side facing away from the lower shell, and the shield also includes a battery cover, which is arranged on the side facing away from the lower shell, and the battery cover at least covers the battery compartment; A second annular sealing rib is protruded on a surface of the battery cover facing the battery compartment; The shield has a second annular sealing groove on one side facing away from the lower shell, and the second sealing groove is arranged around the battery compartment; The metering instrument further includes a fourth sealing component, which is disposed in the second sealing groove and is used for abutting against the second sealing rib.

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