Large-caliber ultrasonic water meter

Abstract

Seamless pipes are welded between two stainless steel flange pipe sections, seamless insertion rod pipes are welded on the seamless pipes, insertion rods are embedded in each seamless insertion rod pipe, a group of insertion rods are oppositely arranged in a pairwise inclined mode, and the insertion rods are fixedly connected with a box body assembly through matching of external screws and threaded holes. An inserting rod adapter plate is arranged in the top cavity groove of the inserting rod, and a water meter assembly is arranged on the top of the box body assembly. According to the utility model, a group of transducer ultrasonic measurement components are adopted in the large-diameter pipe section to carry out large-flow measurement, the measurement precision of the large-diameter water meter is improved, and meanwhile, the transducer adopts a plastic insertion rod form, so that on one hand, the installation is convenient, on the other hand, the cost is reduced, and on the whole, the transducer ultrasonic measurement device is reasonable in structural arrangement and easy to popularize. All installation points take the overall arrangement of parts into account, the structure is compact and durable, and the service life under the large-diameter flow is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ultrasonic water meter, especially a large diameter ultrasonic water meter. BACKGROUND

[0002] With the rapid development of social economy, people's demand for water resources is growing, therefore, water meter as an important water conservancy metering instrument, plays an important role in water resources management. However, the traditional water meter has some problems, such as low precision, easy to be affected by water quality, difficult to maintain, especially large diameter water meter, due to its complex internal structure, more prone to failure.

[0003] In order to solve the above problems, ultrasonic water meter emerges as the times require. Ultrasonic water meter has the advantages of high precision, not affected by water quality, simple maintenance, especially suitable for large diameter water meter application scene. However, the existing ultrasonic water meter still has some problems in practical application, such as limited precision in large flow measurement, complex structure installation and high cost. Therefore, it is necessary to study a new type of ultrasonic water meter to meet the growing market demand. SUMMARY

[0004] The purpose of this part is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract of the specification and the utility model name to avoid obscuring the purpose of this part, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems existing in the prior art large diameter ultrasonic water meter, the utility model is proposed.

[0006] Therefore, the utility model aims to provide a large diameter ultrasonic water meter, solve the problem of limited precision in large flow measurement, complex structure installation and high cost of existing large diameter ultrasonic water meter.

[0007] To solve the above technical problems, the utility model provides technical scheme as follows: A kind of large-diameter ultrasonic water meter, including a group of stainless steel flange pipe sections being symmetrically arranged, seamless pipe is welded between 2 the stainless steel flange pipe sections, a group of symmetric openings are opened in the side wall of the seamless pipe, a group of measuring holes are opened in the top wall of the seamless pipe, a group of the openings are all welded with seamless insertion rod pipe, insertion rod is embedded in each seamless insertion rod pipe, a group of the insertion rod are oppositely arranged in diagonal, a group of threaded holes are arranged in the top of the insertion rod, the insertion rod and box body assembly are fixed by the cooperation of external screw and threaded hole, insertion rod adapter plate is arranged in the top cavity groove of the insertion rod, temperature measurement component and pressure measurement component are arranged in the measuring hole, cover plate is arranged on the top of the box body assembly, water meter assembly is fixedly arranged on the cover plate, the water meter assembly includes shell, wiring box for installing adapter plate and battery for power supply are arranged in the shell inner cavity, electrical box for installing circuit board is arranged on the top of the shell, wide-screen transparent support is arranged on the top of the electrical box, shell cover is arranged on the wide-screen transparent support, the insertion rod adapter plate is connected with the adapter plate signal, the adapter plate is connected with the circuit board signal.

[0008] As a preferred scheme of the large-diameter ultrasonic water meter, wherein: a group of the insertion rod all include insertion rod main body, a group of transducer holes are arranged on the side wall of the insertion rod main body, a group of transducer assemblies are fixedly arranged in a group of the transducer holes, the transducer assembly specifically includes ceramic wafer and plastic plug, rubber gasket is arranged between the ceramic wafer and the plastic plug, one end of the plastic plug is connected with the rubber gasket, and the other end is attached to the side wall of the insertion rod, the insertion rod adapter plate is connected with the transducer assembly signal, the transducer assemblies are oppositely arranged in diagonal, and the distance of ultrasonic signal diagonally penetrating the inner diameter of the seamless pipe is consistent, and the circuit board is connected with the transducer assembly signal.

[0009] As a preferred scheme of the large-diameter ultrasonic water meter, wherein: a group of tin soldering fixing points are arranged on the edge of the insertion rod side wall and connected with the plastic plug.

[0010] As a preferred scheme of the large-diameter ultrasonic water meter, wherein: the material of the insertion rod main body is plastic.

[0011] As a preferred scheme of the large-diameter ultrasonic water meter, wherein: each insertion rod main body is fixed in the corresponding position of the inner cavity of the box body assembly through a group of threaded holes arranged on the top and cooperating with external screws, the box body assembly and the insertion rod main body are connected with elastic retainer, the elastic retainer and the box body assembly are connected with box body rubber pad, the insertion rod main body and the screw fixing position of the box body assembly are inserted with box body pad, and the box body pad is fixed in the inner cavity of the box body assembly.

[0012] As a preferred scheme of the large-diameter ultrasonic water meter, the temperature measuring assembly comprises a temperature measuring column fixedly embedded in the measuring hole, an adapter is arranged on the upper portion of the temperature measuring column, and a 2-way ball valve is arranged on the top of the adapter.

[0013] As a preferred scheme of the large-diameter ultrasonic water meter, the pressure measuring assembly comprises a pressure measuring column fixedly embedded in the measuring hole, the pressure measuring column is fixedly connected to the inner cavity of the box assembly through a pressure plate, and a pressure sensor is embedded in the upper portion of the pressure measuring column.

[0014] As a preferred scheme of the large-diameter ultrasonic water meter, a wire smoothing groove, a middle hole and a limiting rib are arranged in the inner cavity of the box assembly, the pressure measuring column is arranged in the middle hole, a convex groove is arranged in the cavity of the box assembly and at the connection position of the plug rod main body, and the top screw groove of the plug rod main body is embedded in the convex groove.

[0015] As a preferred scheme of the large-diameter ultrasonic water meter, an opening with the same diameter as the seamless pipe is arranged in the stainless steel flange pipe segment, a ring-shaped depression is arranged on the inner wall of the opening, the depth of the depression is consistent with the wall thickness of the seamless pipe, and the seamless pipe is welded to the wall of the ring-shaped depression.

[0016] As a preferred scheme of the large-diameter ultrasonic water meter, the bottom of each of the stainless steel flange pipe segments is arranged in a transverse flat shape, a group of symmetric protrusions are arranged on each of the openings, corresponding recesses are arranged on the seamless plug rod pipe, the protrusions are embedded in the recesses and then welded and fixed, a group of sealing O-rings are arranged on the top of the plug rod main body, a sealing ring is arranged at the connection position of the cover plate and the box assembly, a shell screw gasket is arranged between the water meter assembly and the cover plate, a junction box is fixedly connected to the shell screw gasket through a screw, a screw gasket is arranged at the fixed connection position, a pressure sealing sleeve is arranged between the pressure plate and the pressure measuring column, a decorative sheet and a decorative flange gasket are arranged on the upper portion of the cover plate, and a plug rod pipe cover is welded to the bottom of each seamless plug rod pipe.

[0017] The utility model discloses a large -diameter ultrasonic water meter adopts a group of transducer ultrasonic measuring assembly to carry out the measurement of large flow in large -diameter pipe section, improves the measurement precision of large -diameter water meter, and the transducer of the utility model adopts the plastic plug stick form, on the one hand, convenient to install, on the other hand, reduced cost, from the whole, the utility model discloses structure setting is reasonable, and each installation point gives consideration to the setting of component whole, and the compact structure is durable, guarantees the service life under the large -diameter flow, solves the precision of the existing large -diameter ultrasonic water meter when the large flow measurement is limited, and the structure installation complex and the problem of high cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings. Wherein:

[0019] Figure 1 It is the overall structure schematic diagram of the utility model.

[0020] Figure 2 It is the overall structure explosion schematic diagram of the utility model.

[0021] Figure 3 It is the connection structure schematic diagram of the utility model stainless steel flange pipe section and seamless pipe.

[0022] Figure 4 It is the connection structure schematic diagram of the utility model seamless plug stick pipe and seamless pipe.

[0023] Figure 5 It is the overall structure schematic diagram of the utility model plug stick.

[0024] Figure 6 It is the explosion structure schematic diagram of the utility model plug stick.

[0025] Figure 7 It is the overall structure schematic diagram of the utility model box body subassembly.

[0026] Figure 8 It is the overall structure schematic diagram of the utility model box body subassembly.

[0027] Figure 9 It is the explosion structure schematic diagram of the utility model water meter subassembly. DETAILED DESCRIPTION

[0028] In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, the following detailed description of the specific embodiment of the utility model is combined with the drawing of the specification.

[0029] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present application.

[0030] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures, or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0031] Thirdly, the present application is described in detail in conjunction with the schematic diagram. In the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without the general proportion for the convenience of illustration, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions including length, width and depth should be included in the actual manufacture. Embodiments

[0032] The existing ultrasonic water meter still has some problems in practical application, such as limited precision in large flow measurement, complex structure and installation, high cost, etc. Therefore, it is necessary to study a new type of ultrasonic water meter to meet the growing market demand.

[0033] Therefore, please refer to Figure 1 , Figure 2 , Figure 7 , Figure 8 and Figure 9The utility model provides a kind of large aperture ultrasonic water meter, including a group of symmetrical stainless steel flange pipe sections 1, 2 stainless steel flange pipe sections 1 between welding have seamless pipe 2, a group of symmetrical openings are set up on the lateral wall of seamless pipe 2, a group of measuring holes are set up on the top wall of seamless pipe 2, a group of openings are welded with seamless inserting rod pipe 3, each seamless inserting rod pipe 3 is embedded with inserting rod 4, a group of inserting rod 4 are obliquely arranged oppositely, inserting rod 4 top is provided with a group of screw holes, and the cooperation of external screw and screw hole realizes the fixed connection of inserting rod 4 and box body assembly 5, inserting rod 4 top cavity groove is provided with inserting rod adapter plate 6, temperature measurement component 7 and pressure measurement component 8 are provided in measuring hole, box body assembly 5 top is provided with cover plate 9, water meter component 10 is fixedly provided on cover plate 9, water meter component 10 includes shell 10a, wiring box 10b for installing adapter plate and battery 10c for power supply are provided in the cavity of shell 10a, shell 10a top is provided with electric appliance box 10d for installing circuit board, electric appliance box 10d top is provided with wide-screen transparent support 10e, shell cover 10f is provided on wide-screen transparent support 10e, inserting rod adapter plate 6 is connected with adapter plate signal, adapter plate is connected with circuit board signal.

[0034] Need to be explained, the utility model discloses that opening is provided with 4, and 4 are correspondingly provided to seamless inserting rod pipe 3, and 4 are synchronously provided to the inserting rod 4 embedded in it, and inserting rod 4 is obliquely arranged oppositely, and the emission and return of ultrasonic signal measure flow. In the ultrasonic signal measurement process, a total of 4 groups of measurement information are generated, specifically: first horizontal height is provided with 4 ultrasonic transducer groups;That is, left lower transducer emits ultrasonic signal, and right upper transducer receives ultrasonic signal, generates a group of flow measurement information;Left upper transducer emits ultrasonic signal, and right lower transducer receives ultrasonic signal, generates a group of flow measurement information;Second horizontal height is provided with 4 ultrasonic transducer groups;That is, left lower transducer emits ultrasonic signal, and right upper transducer receives ultrasonic signal, generates a group of flow measurement information;Left upper transducer emits ultrasonic signal, and right lower transducer receives ultrasonic signal, generates a group of flow measurement information;Two horizontal heights correspond to generate 4 groups of flow measurement information.

[0035] Among them, refer to Figure 5 And Figure 6Each set of insertion rods 4 includes an insertion rod body 41. Each insertion rod body 41 has a set of transducer holes 42 on its side wall. Each set of transducer holes 42 has a transducer assembly 43 fixedly installed in it. The transducer assembly 43 specifically includes a ceramic wafer 43a and a plastic plug 43c. A rubber gasket 43b is provided between the ceramic wafer 43a and the plastic plug 43c. One end of the plastic plug 43c is connected to the rubber gasket 43b, and the other end is attached to the side wall of the insertion rod 4. The insertion rod adapter plate 6 is connected to the transducer assembly 43 for signal connection. The transducer assemblies 43 are arranged diagonally opposite each other in pairs, and the distance by which the ultrasonic signal passes through the inner diameter of the seamless tube 2 is the same. The circuit board is connected to the transducer assembly 43 for signal connection.

[0036] It should be noted that the measuring component of the plug transducer of this utility model uses ultrasonic flow measurement. Ultrasonic flow measurement is a conventional method, and the use of its components will not be described in detail here.

[0037] Among them, a set of solder joints 44 are provided on the side wall of the insertion rod 4 and at the edge of the plastic plug 43c. After the plastic plug 43c is assembled, the protruding points can be ironed flat to fix the plastic plug 43c.

[0038] The main body of the insertion rod 41 is made of plastic, which eliminates the need for processing steps compared to copper, thus reducing costs.

[0039] Each insert rod body 41 is fixed to the corresponding position inside the box assembly 5 through a set of threaded holes on the top and external screws. An elastic retaining ring 510 is connected between the box assembly 5 and the insert rod body 41. A box rubber pad 520 is connected between the elastic retaining ring 510 and the box assembly 5. A box gasket 530 is inserted at the screw connection between the insert rod body 41 and the box assembly 5. The box gasket 530 is fixed to the internal cavity of the box assembly 5.

[0040] Please refer to Figure 7 and Figure 8 The inner cavity of the housing assembly 5, which is equipped with the insertion rod body 41, adopts a waist groove design, which directly restricts the rotation of the insertion rod body 41. The screws on the elastic retaining ring 510 and the housing gasket 530 fix the pipe section, the insertion rod body 41, and the housing assembly 5 together.

[0041] Please refer to Figure 2 The temperature measuring component 7 includes a temperature measuring column 71 fixedly embedded in a measuring hole, an adapter 72 is provided on the upper part of the temperature measuring column 71, and a two-point ball valve 73 is provided on the top of the adapter 72. The temperature measuring column 71 is welded to the current measuring hole.

[0042] Please refer to Figure 2The pressure measuring assembly 8 comprises a pressure measuring column 81 fixedly embedded in a measuring hole, the pressure measuring column 81 is fixedly connected in the inner cavity of the box assembly 5 through a pressure plate 82, and a pressure sensor 83 is embedded on the upper portion of the pressure measuring column 81, wherein the pressure measuring column 81 is welded in the current measuring hole.

[0043] Please refer to Figure 7 and Figure 8 The inner cavity of the box assembly 5 is provided with a wire smoothing groove 51, a middle hole 52 and a limiting rib 53, the pressure measuring column 81 is arranged in the middle hole 52, and a convex groove is arranged at the connecting position of the inner cavity of the box assembly 5 and the connecting rod main body 41, and the top screw groove of the connecting rod main body 41 is embedded in the convex groove. The wire smoothing groove 51 can prevent the screw screwed from the top from pressing the wire; the limiting rib 53 is arranged, the box gasket 53 is put in, and the screw hole position is aligned, so that manual alignment of the hole position is not required.

[0044] Please refer to Figure 3 The stainless steel flange pipe section 1 is provided with an opening with the same caliber as the seamless pipe 2, and an annular depression is arranged on the inner wall of the opening, the depth of the annular depression is consistent with the wall thickness of the seamless pipe 2, and the seamless pipe 2 is welded to the wall of the annular depression. This design enables the seamless pipe 2 to be completely matched in thickness with the stainless steel flange pipe section 1, and after welding, no fault will occur in the inner portion of the pipe section, so that smooth connection of the stainless steel flange pipe section 1 and the seamless pipe 2 can be ensured.

[0045] The bottom of each stainless steel flange pipe section 1 is arranged in a transverse flat shape, so that the pipe section can be conveniently placed on the ground.

[0046] Please refer to Figure 4 A group of symmetric protrusions are arranged on each of the openings, and a corresponding recess is arranged on the seamless connecting rod pipe 3, the protrusion is embedded in the recess and then welded and fixed, so that the seamless connecting rod pipe 3 can be completely welded to the seamless pipe 2, and the degree of fixation is strengthened.

[0047] The top of the connecting rod main body 41 is provided with a group of sealing O-rings, the connecting position of the cover plate 9 and the box assembly 5 is provided with a cover plate sealing ring, a shell screw gasket is arranged between the water meter assembly 10 and the cover plate 9, the junction box 10b is fixedly connected to the shell screw gasket through a screw, a screw gasket is arranged at the fixed connection position, and a pressure sealing sleeve is arranged between the pressure plate 82 and the pressure measuring column 81.

[0048] The upper portion of the cover plate 9 is provided with a decorative sheet and a decorative flange gasket.

[0049] The bottom of each seamless connecting rod pipe 3 is welded with a connecting rod pipe cover 31, so as to cooperate with the seamless connecting rod pipe 3 to realize a semi-closed space and accommodate the embedding of the connecting rod 4.

[0050] The utility model provides a kind of large-caliber ultrasonic water meter, in large-caliber pipe section, a group of transducer ultrasonic measuring assembly is used to carry out the measurement of large flow, improve the measurement accuracy of large-caliber water meter, while the transducer of the utility model adopts plastic insertion rod form, on the one hand, it is convenient to install, on the other hand, it reduces cost, as a whole, the utility model structure is reasonably set, each installation point gives consideration to the setting of component whole, compact structure is durable, ensure the service life under large-caliber flow, solve the precision limit of existing large-caliber ultrasonic water meter large flow measurement, structure installation complex and the problem of high cost.

[0051] It should be noted that the above examples are only used to illustrate the technical solutions of the utility model and are not limiting. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and they should be covered in the scope of the claims of the utility model.

Claims

1. A large-diameter ultrasonic water meter, characterized in that: The system includes a set of symmetrically arranged stainless steel flange pipe sections (1), with a seamless pipe (2) welded between the two stainless steel flange pipe sections (1). A set of symmetrical openings is provided on the side wall of the seamless pipe (2), and a set of measuring holes is provided on the top wall of the seamless pipe (2). A seamless insert pipe (3) is welded to each of the openings. An insert rod (4) is embedded in each of the seamless insert pipes (3). The insert rods (4) are arranged diagonally opposite each other in a set. A set of threaded holes is provided on the top of the insert rod (4). The insert rod (4) is fixed to the box assembly (5) by the cooperation of the external screw and the threaded hole. An insert rod adapter plate (6) is provided in the cavity of the top of the insert rod (4). A temperature measuring component is provided in the measuring hole. 7) and pressure measuring component (8), the top of the box assembly (5) is provided with a cover plate (9), the cover plate (9) is fixedly provided with a water meter assembly (10), the water meter assembly (10) includes a housing (10a), the inner cavity of the housing (10a) is provided with a junction box (10b) for installing the adapter plate and a battery (10c) for power supply, the top of the housing (10a) is provided with an electrical box (10d) for installing the circuit board, the top of the electrical box (10d) is provided with a wide screen transparent bracket (10e), the wide screen transparent bracket (10e) is provided with a housing cover (10f), the plug adapter plate (6) is signal connected to the adapter plate, and the adapter plate is signal connected to the circuit board.

2. The large-diameter ultrasonic water meter as described in claim 1, characterized in that: Each set of the insertion rods (4) includes an insertion rod body (41). Each insertion rod body (41) has a set of transducer holes (42) on its side wall. Each set of transducer holes (42) has a transducer assembly (43) fixedly installed in each transducer hole (42). The transducer assembly (43) specifically includes a ceramic wafer (43a) and a plastic plug (43c). A rubber gasket (43b) is provided between the ceramic wafer (43a) and the plastic plug (43c). One end of the plastic plug (43c) is connected to the rubber gasket (43b), and the other end is attached to the side wall of the insertion rod (4). The insertion rod adapter plate (6) is connected to the transducer assembly (43) for signal connection. The transducer assemblies (43) are arranged obliquely opposite each other, and the distance by which the ultrasonic signal obliquely penetrates the inner diameter of the seamless tube (2) is the same. The circuit board is connected to the transducer assembly (43) for signal connection.

3. The large-diameter ultrasonic water meter as described in claim 2, characterized in that: A set of solder joints (44) are provided on the side wall of the insert (4) and at the edge of the plastic plug (43c).

4. The large-diameter ultrasonic water meter as described in claim 3, characterized in that: The main body (41) of the insertion rod is made of plastic.

5. The large-diameter ultrasonic water meter as described in claim 4, characterized in that: Each of the insert rod bodies (41) is fixed to the corresponding position of the inner cavity of the box assembly (5) through a set of threaded holes on the top and an external screw. An elastic retaining ring (510) is connected between the box assembly (5) and the insert rod body (41). A box rubber pad (520) is connected between the elastic retaining ring (510) and the box assembly (5). A box gasket (530) is inserted at the screw connection between the insert rod body (41) and the box assembly (5). The box gasket (530) is fixed to the inner cavity of the box assembly (5).

6. The large-diameter ultrasonic water meter as described in claim 5, characterized in that: The temperature measuring component (7) includes a temperature measuring column (71) fixedly embedded in a measuring hole, an adapter (72) is provided on the upper part of the temperature measuring column (71), and a two-point ball valve (73) is provided on the top of the adapter (72).

7. The large-diameter ultrasonic water meter as described in claim 6, characterized in that: The pressure measuring component (8) includes a pressure measuring column (81) fixedly embedded in a measuring hole. The pressure measuring column (81) is fixed to the inner cavity of the box assembly (5) by a pressure plate (82). A pressure sensor (83) is embedded on the upper part of the pressure measuring column (81).

8. The large-diameter ultrasonic water meter as described in claim 7, characterized in that: The box assembly (5) has a wire-strapping groove (51), a central hole (52) and a limiting rib (53) in its internal cavity. The pressure measuring column (81) passes through the central hole (52). A convex groove is provided in the cavity of the box assembly (5) at the connection with the plug body (41). The top screw groove of the plug body (41) is embedded in the convex groove.

9. The large-diameter ultrasonic water meter as described in claim 8, characterized in that: The stainless steel flange pipe section (1) has an opening with the same diameter as the seamless pipe (2). The inner wall of the opening has an annular depression with a depth consistent with the wall thickness of the seamless pipe (2). The seamless pipe (2) is welded to the annular depression wall.

10. The large-diameter ultrasonic water meter as described in claim 9, characterized in that: The bottom of each set of stainless steel flange pipe sections (1) is set to be horizontally flat; each set of openings is provided with a set of symmetrical protrusions, and the corresponding seamless insert pipe (3) is provided with a recess that is adapted to the protrusion. The protrusion is embedded into the recess and then welded and fixed; the top of the insert body (41) is provided with a set of sealing O-rings, the connection between the cover plate (9) and the box assembly (5) is provided with a cover plate sealing ring, the water meter assembly (10) and the cover plate (9) are provided with a housing screw washer, the junction box (10b) is fixed to the housing screw washer by screws, and a screw washer is inserted at the fixed connection, the pressure plate (82) is provided with a pressure sealing sleeve between the pressure measuring column (81); the upper part of the cover plate (9) is provided with a decorative piece and a decorative flange gasket; each seamless insert pipe (3) is welded with an insert pipe cap (31) at the bottom.

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