Water meter shell convenient to install

By designing a water meter case that is easy to install, using the connection mechanism, installation mechanism and extrusion mechanism, the problem of cumbersome installation operation of existing water meter is solved, and the rapid connection between the water pipe and the communication pipe is achieved and the rapid installation of the watch case is improved, and the convenience and stability of installation are improved.

CN222993791UActive Publication Date: 2025-06-17NINGBO HUASHUN MOLDING TECH CO LTD
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Patent Information

Application Number
CN202422231068.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-12
Publication Date
2025-06-17
Estimated Expiration
2034-09-12

AI Technical Summary

Technical Problem

When installing and connecting existing water meters with water pipes, they are cumbersome to operate and are not convenient to install when space is limited.

Method used

A water meter case that is conveniently installed is designed. By setting up a connecting mechanism, installation mechanism and extrusion mechanism, the rapid communication between the water pipe and the communication pipe and the rapid installation of the case are achieved.

Benefits of technology

The installation process of water meter is simplified and the convenience and stability of installation is improved, especially when space is limited.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a water meter shell convenient to install, and belongs to the technical field of water meters. The water meter shell convenient to install comprises a meter shell body, the meter shell body comprises a bottom shell, communicating pipes communicate with the two sides of the outer portion of the bottom shell, connecting mechanisms are arranged at the opposite ends of the communicating pipes, each connecting mechanism comprises a fixing sleeve, a hollow ring is connected to one side of the interior of each fixing sleeve, and an inserting groove is formed between the outer wall of each hollow ring and the interior of the corresponding fixing sleeve; the front face and the back face of the fixing sleeve are each provided with a long groove, an installation mechanism is arranged in each long groove and comprises a U-shaped base, square grooves are formed in the top face and the bottom face of each U-shaped base, an installation block is arranged in each U-shaped base, and the side, away from the inner wall of each U-shaped base, of each installation block is connected with the outer wall of the corresponding insertion sleeve. A pair of cavities is formed in the mounting block, square blocks are slidably connected into the pair of cavities, and the opposite ends of the pair of square blocks extend into the square groove.
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Description

Technical Field

[0001] The utility model relates to the technical field of water meters, in particular to a water meter shell convenient for installation. Background Technique

[0002] A water meter is an instrument for measuring water flow, mostly for measuring the cumulative water flow. The working principle of a water meter is mainly to drive the internal mechanical structure to rotate by measuring the power of water flow, so as to cumulatively calculate the water volume flowing through. The power generated when water flow passes through the water meter will drive the impeller or rotor inside the water meter to rotate. Specifically, when water flow passes through the water meter, it will push an impeller (or rotor) to rotate, and the rotation speed of the impeller is proportional to the speed of water flow. This rotation action is converted into a readable digital display through a series of mechanical transmission devices, usually by connecting a counting mechanism through gear transmission to accumulate the rotation times of the impeller to calculate the water volume flowing through.

[0003] Based on the above, the inventor found the following problems: When the existing water meter is installed and connected to a water pipe, it is mostly connected by a flange. Installing the water meter and the water pipe through a flange requires turning multiple bolts, resulting in a cumbersome operation. At the same time, a special installation tool is needed to turn the bolts during the installation process of the water meter. When the space at the installation location of the water meter is small, it is not convenient to turn the installation tool to tighten the bolts, thus causing inconvenience during installation.

[0004] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies, and a water meter shell convenient for installation is provided, in order to achieve the purpose of having more practical value. Content of the Utility Model

[0005] The purpose of the utility model is to provide a water meter shell convenient for installation to solve the problems put forward in the above background technique.

[0006] In view of the above problems, the technical solution proposed by the utility model is:

[0007] A water meter housing that is convenient for installation, including a housing body. The housing body includes a bottom shell. Both sides of the outside of the bottom shell are communicated with connecting pipes. One end of each of a pair of the connecting pipes facing away from each other is provided with a connecting mechanism. The connecting mechanism includes a fixed sleeve. The fixed sleeve is sleeved on the outside of one end of the connecting pipe away from the bottom shell. And one side inside the fixed sleeve is connected with a hollow ring. The outer wall of the hollow ring and the inside of the fixed sleeve form a plug-in groove. Inside the plug-in groove is provided a plug-in sleeve. One end inside the plug-in sleeve away from the fixed sleeve is connected with a water pipe. Long grooves are opened on the front and back of the fixed sleeve. Inside the long grooves is provided an installation mechanism. The installation mechanism includes a U-shaped seat. Square grooves are opened on the top and bottom of the U-shaped seat. Inside the U-shaped seat is provided an installation block. One side of the installation block away from the inner wall of the U-shaped seat is connected with the outer wall of the plug-in sleeve. And inside the installation block are provided a pair of cavities. Inside each of the pair of cavities is slidably connected with a square block. One end of each of the pair of square blocks facing away from each other penetrates through the installation block and is in clearance fit with the through hole of the installation block. And one end of each of the pair of square blocks facing away from each other extends into the square groove and is in clearance fit with the square groove.

[0008] Further, each of the pair of square blocks is in a "T" shape. And one end of each of the pair of square blocks facing each other is connected with a spring. One end of each of the pair of springs facing each other is connected with the inner wall of the cavity.

[0009] The beneficial effect of adopting the above further scheme is that by setting the springs, under the elastic action of the springs, one end of each of the pair of square blocks facing away from each other extends into the square groove, so that the installation block is fixed inside the U-shaped seat. At the same time, the square blocks are in a T shape, avoiding the square blocks extending completely out of the cavity.

[0010] Further, a pair of first threaded holes are opened on the U-shaped seat. Corresponding to the pair of first threaded holes on the installation block are opened a pair of second threaded holes. A bolt is threadedly connected between the first threaded hole and the second threaded hole. One end of the bolt away from the second threaded hole is installed with a limiting rod. A pair of semi-circular grooves are opened at one end of the limiting rod away from the bolt.

[0011] The beneficial effect of adopting the above further scheme is that by arranging the limiting rod and the bolt between the opposite first threaded hole and the second threaded hole, it is convenient to further fix the installation block and the U-shaped seat, thereby improving the stability of the connection between the installation block and the U-shaped seat. At the same time, by opening a pair of semi-circular grooves at one end of the limiting rod away from the bolt, there is a certain distance between the pair of semi-circular grooves, so that it is convenient for the user to pinch the knob shaft between the pair of semi-circular grooves with fingers, thereby rotating the limiting rod.

[0012] Further, extrusion mechanisms are provided at the top and bottom surfaces of the U-shaped seat at the square groove. Each of the pair of extrusion mechanisms includes a hollow seat. On both sides inside each of the pair of hollow seats, sliding grooves are formed. A pressing block is slidably connected between the pair of sliding grooves. At one end of the pressing block located inside the hollow seat, a resisting block is connected. The end of the resisting block away from the pressing block abuts against the end of the square block away from the spring.

[0013] The beneficial effect of adopting the above further solution is that by providing hollow seats at the top and bottom surfaces of the U-shaped seat at the square groove, the hollow seats, the square groove, and the square block are on the same axis. When the pressing blocks are respectively pushed into the hollow seats, the square block is extruded until the square block is separated from the square groove, so as to facilitate the separation of the mounting block and the U-shaped seat, and the insertion sleeve and the insertion groove are separated.

[0014] Further, the outer wall of the insertion sleeve fits with the inner wall of the fixed sleeve, and the inner wall of the insertion sleeve fits with the outer wall of the hollow ring. The inner circular radius of the hollow ring is the same as the inner circular radius of the water pipe.

[0015] The beneficial effect of adopting the above further solution is that since the inner and outer walls of the insertion sleeve respectively fit with the outer wall of the hollow ring and the inner wall of the fixed sleeve, the tightness between the insertion sleeve and the fixed sleeve and the hollow ring is ensured.

[0016] Further, a sealing ring is connected to one side inside the insertion groove of the fixed sleeve. One side of the sealing ring abuts and fits with the end of the insertion sleeve away from the water pipe.

[0017] The beneficial effect of adopting the above further solution is that by providing the sealing ring, the sealing performance between the insertion sleeve and the fixed sleeve is improved.

[0018] Further, a top cover is provided at the upper end of the bottom shell. On one side of the outer wall of the top cover near the upper end, a hinge seat is connected. Inside the hinge seat, a connecting bar is rotatably connected. The connecting bar is in an "L" shape, and one end of the connecting bar is connected with a protective cover. The bottom end of the protective cover fits with the upper surface of the top cover.

[0019] The beneficial effect of adopting the above further solution is that since the top cover and the protective cover are hinged by the hinge seat and the connecting bar, it is convenient to open the protective cover to read the degree display dial installed inside the top cover.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: For the water meter housing that is convenient to install, align the insertion slots between the insertion sleeve, the fixed sleeve, and the hollow ring, and then push the housing body. The installation blocks outside the insertion sleeve enter the inside of the U-shaped seat under the connection effect of the long slots. Under the elastic action of the spring, the opposite ends of a pair of square blocks extend into the inside of the square slots, fixing the installation blocks inside the U-shaped seat, thereby completing the connection between the water pipe and the communicating pipe and enabling the quick installation of the housing body and the water pipe. At the same time, the square blocks are T-shaped to prevent the square blocks from completely extending out of the cavity. By arranging a limiting rod and a bolt between the opposite first threaded holes and second threaded holes, it is convenient to further fix the installation blocks and the U-shaped seat, thereby improving the connection stability between the installation blocks and the U-shaped seat. By arranging hollow seats at the top and bottom of the U-shaped seat at the position of the square slots, the hollow seats, the square slots, and the square blocks are on the same axis. When pushing the pressing blocks into the inside of the hollow seats respectively, the square blocks are extruded until the square blocks are separated from the square slots, which is convenient for the separation of the installation blocks and the U-shaped seat and the separation of the insertion sleeve and the insertion slots. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 6 is a three-dimensional structural schematic diagram of a water meter housing that is convenient to install provided by the present utility model;

[0022] Figure 2 FIG. 10 is a three-dimensional unfolded structural schematic diagram of the fixed sleeve and the insertion sleeve of a water meter housing that is convenient to install provided by the present utility model;

[0023] Figure 3 FIG. 14 is a three-dimensional structural schematic diagram of the fixed sleeve and the U-shaped seat of a water meter housing that is convenient to install provided by the present utility model;

[0024] Figure 4 FIG. 18 is a three-dimensional structural schematic diagram of the insertion sleeve and the installation blocks of a water meter housing that is convenient to install provided by the present utility model;

[0025] Figure 5 FIG. 22 is a front sectional structural schematic diagram of the hollow seat of a water meter housing that is convenient to install provided by the present utility model.

[0026] In the figure: 100, the watch case body; 1001, the bottom case; 1002, the top cover; 1003, the protective cover; 1004, the connecting pipe; 1005, the hinge seat; 1006, the connecting bar; 200, the connecting mechanism; 2001, the fixing sleeve; 2002, the hollow ring; 2003, the plugging sleeve; 2004, the water pipe; 2005, the long slot; 300, the installation mechanism; 3001, the U-shaped seat; 3002, the square slot; 3003, the installation block; 3004, the spring; 3005, the square block; 3006, the first threaded hole; 3007, the second threaded hole; 3008, the limiting rod; 3009, the semi-circular slot; 400, the extrusion mechanism; 4001, the hollow seat; 4002, the sliding slot; 4003, the pressing block; 4004, the abutting block. Specific embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1 - 5, the present utility model provides a technical solution: a water meter housing that is convenient for installation, including a housing body 100. The housing body 100 includes a bottom shell 1001. Both sides of the outside of the bottom shell 1001 are communicated with a communicating pipe 1004. A connecting mechanism 200 is provided at one end of a pair of communicating pipes 1004 facing away from each other. The connecting mechanism 200 includes a fixing sleeve 2001. The fixing sleeve 2001 is sleeved on the outside of one end of the communicating pipe 1004 away from the bottom shell 1001. And one side inside the fixing sleeve 2001 is connected with a hollow ring 2002. The outer wall of the hollow ring 2002 and the inside of the fixing sleeve 2001 form a plugging groove. Inside the plugging groove is provided a plugging sleeve 2003. One end inside the plugging sleeve 2003 away from the fixing sleeve 2001 is connected with a water pipe 2004. Long grooves 2005 are opened on the front and back of the fixing sleeve 2001. Inside the long grooves 2005 is provided an installation mechanism 300. The installation mechanism 300 includes a U-shaped seat 3001. Square grooves 3002 are opened on the top and bottom of the U-shaped seat 3001. Inside the U-shaped seat 3001 is provided an installation block 3003. One side of the installation block 3003 away from the inner wall of the U-shaped seat 3001 is connected with the outer wall of the plugging sleeve 2003. And inside the installation block 3003 are provided a pair of cavities. Inside a pair of cavities are slidably connected with square blocks 3005. One end of a pair of square blocks 3005 facing away from each other penetrates through the installation block 3003 and is in clearance fit with the through hole of the installation block 3003. And one end of a pair of square blocks 3005 facing away from each other extends into the square groove 3002 and is in clearance fit with the square groove 3002. A pair of square blocks 3005 are both in a "T" shape. And one end of a pair of square blocks 3005 facing each other is connected with a spring 3004. One end of a pair of springs 3004 facing each other is connected with the inner wall of the cavity. Align the plugging groove between the plugging sleeve 2003 and the fixing sleeve 2001 and the hollow ring 2002. Then push the housing body 100. So that the installation block 3003 outside the plugging sleeve 2003 enters the inside of the U-shaped seat 3001 under the communication action of the long groove 2005. And under the elastic action of the spring 3004, one end of a pair of square blocks 3005 facing away from each other extends into the square groove 3002. So that the installation block 3003 is fixed inside the U-shaped seat 3001. Thus, the connection between the water pipe 2004 and the communicating pipe 1004 is completed. And the quick installation of the housing body 100 and the water pipe 2004 is realized.

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0030] Please refer to Figures 1 - 5, the present utility model provides a technical solution: A pair of first threaded holes 3006 are provided on the U-shaped seat 3001. A pair of second threaded holes 3007 are provided on the mounting block 3003 corresponding to the pair of first threaded holes 3006. A bolt is threadedly connected between the first threaded hole 3006 and the second threaded hole 3007. A limiting rod 3008 is installed at one end of the bolt away from the second threaded hole 3007. A pair of semi-circular grooves 3009 are provided at one end of the limiting rod 3008 away from the bolt. Extrusion mechanisms 400 are provided on both the top surface and the bottom surface of the U-shaped seat 3001 at the square groove 3002. Each of the pair of extrusion mechanisms 400 includes a hollow seat 4001. A pair of sliding grooves 4002 are provided on both sides inside the pair of hollow seats 4001. A pressing block 4003 is slidably connected between the pair of sliding grooves 4002. One end of the pressing block 4003 located inside the hollow seat 4001 is connected with a resisting block 4004. One end of the resisting block 4004 away from the pressing block 4003 abuts against one end of the square block 3005 away from the spring 3004. By providing the limiting rod 3008 and the bolt between the opposite first threaded hole 3006 and the second threaded hole 3007, it is convenient to further fix the mounting block 3003 and the U-shaped seat 3001, thereby improving the connection stability between the mounting block 3003 and the U-shaped seat 3001. At the same time, by providing a pair of semi-circular grooves 3009 at one end of the limiting rod 3008 away from the bolt, there is a certain distance between the pair of semi-circular grooves 3009, enabling the user to easily pinch the knob shaft between the pair of semi-circular grooves 3009 with fingers, thereby rotating the limiting rod 3008. By providing the hollow seat 4001 at the square groove 3002 on the top surface and the bottom surface of the U-shaped seat 3001, the hollow seat 4001, the square groove 3002, and the square block 3005 are on the same axis. When the pressing block 4003 is respectively pushed into the interior of the hollow seat 4001, the square block 3005 is extruded until the square block 3005 is separated from the square groove 3002, thereby facilitating the separation of the mounting block 3003 and the U-shaped seat 3001, and separating the insertion sleeve 2003 from the insertion slot.

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] Please refer to Figures 1 - 5, the present utility model provides a technical solution: the outer wall of the insertion sleeve 2003 fits with the inner wall of the fixed sleeve 2001, and the inner wall of the insertion sleeve 2003 fits with the outer wall of the hollow ring 2002. The inner circle radius of the hollow ring 2002 is the same as the inner circle radius of the water pipe 2004. A sealing ring is connected to one side inside the insertion slot of the fixed sleeve 2001. One side of the sealing ring is in pressing fit with the end of the insertion sleeve 2003 away from the water pipe 2004. The upper end of the bottom shell 1001 is provided with a top cover 1002. One side of the outer wall of the top cover 1002 near the upper end is connected with a hinge seat 1005. A connecting bar 1006 is rotatably connected inside the hinge seat 1005. The connecting bar 1006 is in an "L" shape, and one end of the connecting bar 1006 is connected with a protective cover 1003. The bottom end of the protective cover 1003 fits with the upper end surface of the top cover 1002. Since the inner wall and the outer wall of the insertion sleeve 2003 fit with the outer wall of the hollow ring 2002 and the inner wall of the fixed sleeve 2001 respectively, the tightness between the insertion sleeve 2003 and the fixed sleeve 2001 and the hollow ring 2002 is ensured. By setting the sealing ring, the sealing performance between the insertion sleeve 2003 and the fixed sleeve 2001 is improved. Since the top cover 1002 and the protective cover 1003 are hinged through the hinge seat 1005 and the connecting bar 1006, it is convenient to open the protective cover 1003 to read the degree display dial installed inside the top cover 1002.

[0033] Specifically, the working principle of this conveniently installed water meter housing is as follows: When in use, first, align the insertion slot between the insertion sleeve 2003, the fixed sleeve 2001, and the hollow ring 2002. Then, push the housing body 100 so that the installation block 3003 outside the insertion sleeve 2003 enters the interior of the U-shaped seat 3001 under the connection of the long slot 2005. Due to the elastic action of the spring 3004, the opposite ends of a pair of square blocks 3005 extend into the square slot 3002, fixing the installation block 3003 inside the U-shaped seat 3001, thus completing the connection between the water pipe 2004 and the connecting pipe 1004 and enabling the quick installation of the housing body 100 and the water pipe 2004. By arranging a limiting rod 3008 and a bolt between the opposite first threaded hole 3006 and second threaded hole 3007, it is convenient to further fix the installation block 3003 and the U-shaped seat 3001, thereby improving the connection stability between the installation block 3003 and the U-shaped seat 3001. Since the inner wall and outer wall of the insertion sleeve 2003 are respectively in contact with the outer wall of the hollow ring 2002 and the inner wall of the fixed sleeve 2001, the tightness between the insertion sleeve 2003, the fixed sleeve 2001, and the hollow ring 2002 is ensured. By setting a sealing ring, the sealing performance between the insertion sleeve 2003 and the fixed sleeve 2001 is improved. When it is necessary to disassemble the housing body 100, since a pair of semi-circular grooves 3009 are provided at the end of the limiting rod 3008 far from the bolt and there is a certain distance between the pair of semi-circular grooves 3009, it is convenient for the user to pinch the knob shaft between the pair of semi-circular grooves 3009 with fingers, thereby rotating the limiting rod 3008 to separate the bolt from the first threaded hole 3006 and the second threaded hole 3007. Then, push the pressing block 4003 into the interior of the hollow seat 4001 respectively, thereby squeezing the square block 3005 until the square block 3005 is separated from the square slot 3002, thus facilitating the separation of the installation block 3003 and the U-shaped seat 3001 and the separation of the insertion sleeve 2003 from the insertion slot.

Claims

1. A water meter case that is easy to install, characterized in that: The watch case body (100) comprises a bottom shell (1001), both sides of the outside of the bottom shell (1001) are connected with connecting pipes (1004), and a pair of connecting pipes (1004) are provided with connecting mechanisms (200) at opposite ends thereof, and the connecting mechanisms (200) comprise a fixing sleeve (2001), the fixing sleeve (2001) is sleeved on the outside of the end of the connecting pipe (1004) away from the bottom shell (1001), and a hollow ring (2002) is connected to the inner side of the fixing sleeve (2001), the outer wall of the hollow ring (2002) and the inside of the fixing sleeve (2001) form a plug-in groove, a plug-in sleeve (2003) is provided inside the plug-in groove, and the end of the plug-in sleeve (2003) away from the fixing sleeve (2001) is connected with a water pipe (2004), and the front and back sides of the fixing sleeve (2001) are provided with long A slot (2005) is provided inside the long slot (2005), wherein a mounting mechanism (300) is provided inside the long slot (2005), wherein the mounting mechanism (300) comprises a U-shaped seat (3001), wherein the top surface and the bottom surface of the U-shaped seat (3001) are both provided with square slots (3002), wherein a mounting block (3003) is provided inside the U-shaped seat (3001), wherein a side of the mounting block (3003) away from the inner wall of the U-shaped seat (3001) is connected to the outer wall of the plug sleeve (2003), wherein a pair of cavities are provided inside the mounting block (3003), wherein square blocks (3005) are slidably connected inside the pair of cavities, wherein opposite ends of the pair of square blocks (3005) penetrate the mounting block (3003) and are gap-matched with the through holes of the mounting block (3003), and opposite ends of the pair of square blocks (3005) extend to the inside of the square slot (3002) and are gap-matched with the square slot (3002).

2. A water meter case that is easy to install according to claim 1, characterized in that: The pair of blocks (3005) are both in a "T" shape, and opposite ends of the pair of blocks (3005) are connected to springs (3004), and opposite ends of the pair of springs (3004) are connected to the inner wall of the cavity.

3. A water meter case that is easy to install according to claim 2, characterized in that: A pair of first threaded holes (3006) are formed on the U-shaped seat (3001), and a pair of second threaded holes (3007) are formed on the mounting block (3003) corresponding to the pair of first threaded holes (3006). Bolts are threadedly connected between the first threaded holes (3006) and the second threaded holes (3007), and a limiting rod (3008) is installed at one end of the bolt away from the second threaded holes (3007). A pair of semicircular grooves (3009) are formed at one end of the limiting rod (3008) away from the bolt.

4. A water meter case that is easy to install according to claim 3, characterized in that: The top and bottom surfaces of the U-shaped seat (3001) are both provided with an extrusion mechanism (400) at the square groove (3002), a pair of the extrusion mechanisms (4000) both comprise a hollow seat (4001), both sides of the interior of the pair of hollow seats (4001) are provided with a slide groove (4002), a pressing block (4003) is slidably connected between the pair of slide grooves (4002), one end of the pressing block (4003) located inside the hollow seat (4001) is connected with a resisting block (4004), and one end of the resisting block (4004) away from the pressing block (4003) resists against one end of the square block (3005) away from the spring (3004).

5. A water meter case that is easy to install according to claim 4, characterized in that: The outer wall of the plug sleeve (2003) fits with the inner wall of the fixed sleeve (2001), and the inner wall of the plug sleeve (2003) fits with the outer wall of the hollow ring (2002), and the inner radius of the hollow ring (2002) is consistent with the inner radius of the water pipe (2004).

6. A water meter case that is easy to install according to claim 5, characterized in that: The fixing sleeve (2001) is connected to a sealing ring on one side inside the plug-in slot, and one side of the sealing ring is pressed and fitted against an end of the plug-in sleeve (2003) away from the water pipe (2004).

7. A water meter case that is easy to install according to claim 6, characterized in that: A top cover (1002) is provided at the upper end of the bottom shell (1001); a hinged seat (1005) is connected to one side of the outer wall of the top cover (1002) close to the upper end; a connecting strip (1006) is rotatably connected to the inside of the hinged seat (1005); the connecting strip (1006) is in an "L" shape; one end of the connecting strip (1006) is connected to a protective cover (1003); the bottom end of the protective cover (1003) is in contact with the upper end surface of the top cover (1002).