Water meter shell and dry-type water meter and wet-type water meter using same

Abstract

The invention relates to a meter shell of a water meter, a dry type water meter and a wet type water meter, wherein the meter shell effectively reduces material cost, facilitates enterprise material preparation management and is suitable for being compatible with various types of water meters. The meter shell of the water meter comprises a cavity used for installing an impeller bin, and internal threads used for being connected with a pressing ring in a middle body assembly of the dry type water meter in a screwed mode are arranged on the inner side of the cavity wall at the opening position of the cavity. And an external thread which is compatible with a lock cylinder outer cover of the dry type water meter and a middle cover of the wet type water meter is arranged on the outer side wall of the cavity wall opposite to the internal thread. The meter shell is suitable for a dry-type water meter and a wet-type water meter, and compared with a meter shell of a wet-type water meter in the prior art, the material cost can be greatly reduced. After the watchcase is adopted, unexpected remarkable effects are brought to purchasing, burdening, storage and standardized management of the watchcase.

Description

Technical Field

[0001] This invention relates to a water meter housing, and more particularly to a housing compatible with both rotary dry and wet water meters, as well as dry and wet water meters incorporating the housing. Background Technology

[0002] like Figure 1 , Figure 2 As shown, the existing rotary dry water meter 2 consists of a casing 1, an impeller assembly 5, a middle body assembly, a counter assembly 4, a clamp, and a dust cover.

[0003] The watch case 1 has a cavity 11 for accommodating the impeller assembly 5. The water inlet pipe and water outlet pipe on both sides of the watch case 1 are respectively connected to the cavity 11. The watch case wall corresponding to the cavity 11 extends upward to a set height to form a cylindrical cavity wall 12. The upper port of the cavity wall 12 is open. An internal thread 13 is provided on the inner peripheral wall of the cavity wall 12. A groove 24 for assembling the shell ring is provided on the outer peripheral wall of the cavity wall 12 opposite to the internal thread 13.

[0004] Impeller assembly 5 consists of an impeller, an impeller chamber, and a filter screen.

[0005] The middle body assembly consists of a pressure ring 21 and a middle body cover plate with a waterproof structure and a magnetic coupling mounting position. The middle body cover plate covers the top cover of the impeller compartment. The outer periphery of the pressure ring 21 is provided with an external thread 14 that is adapted to be screwed into the internal thread 13. The pressure ring 21 is placed on the middle body cover plate and the water seal ring and screwed into the opening of the cavity wall 12. Thus, the counter assembly 4 located on the middle body cover plate is isolated from the impeller compartment water seal.

[0006] The counter assembly 4 includes a support plate 28 and a gear set, a digit wheel assembly, and a dial encapsulated in a lock cylinder inner cover 23 made of transparent material. The support plate 28 is fastened to the middle cover plate. The lock cylinder inner cover 23, carrying the gear set, digit wheel assembly, and dial, is placed on the support plate 28. The bottom outer edge of the lock cylinder inner cover 23 is fastened to the support plate 28 by screws or pins. The lock cylinder inner cover 23, the support plate 28, and the watch case 1 are fixed together by a housing ring.

[0007] The dust cover is located on the housing ring (or it can be designed as an integral structure with the housing ring), and it is fitted on the inner cover 23 of the lock cylinder. The upper surface of the dust cover is slightly lower than the plane of the surface panel of the inner cover 23 of the lock cylinder.

[0008] like Figure 3 , Figure 4 As shown, the wet water meter 3 in the prior art consists of a casing 1, an impeller assembly 5, a counter assembly 4, a cover cup (hereinafter referred to as the movement cup 31) for accommodating the counter assembly 4, an apparent transparent cover plate 32, and a middle cover 35.

[0009] The watch case 1 has a cavity 11 for accommodating the impeller assembly 5. The water inlet pipe and water outlet pipe on both sides of the watch case 1 are connected to the cavity 11. The wall of the watch case 1 corresponding to the cavity 11 extends upward to a set height to form a cylindrical cavity wall 12. The upper end of the cavity wall 12 is open. The outer peripheral wall of the cavity wall 12 is provided with an external thread 14 for assembling the middle cover 35. The inner peripheral wall of the cavity wall 12 opposite to the external thread 14 is a smooth surface.

[0010] Impeller assembly 5 consists of an impeller, an impeller chamber, and a filter screen.

[0011] The movement cup 31 is a hollow cylindrical shape. The counter assembly 4 is installed inside the movement cup 31. It is placed inside the cavity wall 12 and installed on the top cover of the impeller compartment. The outer wall of the movement cup 31 abuts against the inner wall of the cavity wall 12. The watch case 1 bears the water pressure in the movement cup 31 to prevent the movement cup 31, which is made of plastic, from breaking.

[0012] The counter assembly 4 includes an upper clamping plate, a lower clamping plate, a gear set located between the upper clamping plate and the lower clamping plate, a number wheel assembly, and a dial set on the upper clamping plate. The starting gear in the gear set meshes with the wheel shaft gear of the impeller.

[0013] A transparent cover plate 32 is placed on the top surface of the movement holder cup 31.

[0014] The inner cover 35 is cylindrical, with an inwardly extending annular ring on its upper end face. The lower inner circumferential wall of the inner cover 35 is threaded (hereinafter referred to as the inner cover thread 25). When the inner cover 35 is screwed onto the watch case 1, the annular ring presses against the transparent cover plate 32 (a water-sealing gasket is provided between the annular ring and the transparent cover plate 32). Thus, the inner cover 35 water-seales and locks the transparent cover plate 32, the movement cup 31, and the counter assembly 4 within the space enclosed by the transparent cover plate 32 and the watch case 1.

[0015] Although the dry water meter 2 and wet water meter 3 mentioned above each have their own characteristics, the structure of the casing 1 and the height of the cavity wall 12 used in the two are different, and the casing 1 is incompatible. This brings many management inconveniences to the material ordering in the procurement process, the material allocation in the production process, and the material storage. At the same time, since the material used for the casing 1 of the wet water meter 3 is greater than that of the dry water meter 2, for example, the cavity wall 12 of the casing 1 of the wet water meter 3 is 80%-100% longer than that of the casing 1 of the dry water meter 2. As a result, the material cost of the casing 1 made of metal is higher, especially for copper casing 1, which is particularly prominent given the current high price of copper.

[0016] Therefore, adopting a meter casing that uses low-consumption materials and is compatible with both wet and dry water meters is an urgent problem to be solved in the industry. Summary of the Invention

[0017] The technical problem to be solved by the present invention is to provide a water meter casing that effectively reduces material costs, facilitates enterprise material preparation management, and is compatible with multiple types of water meters, as well as dry and wet water meters using the casing.

[0018] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The water meter casing of the present invention includes a cavity for installing an impeller chamber, characterized in that: an internal thread for screwing a pressure ring in the middle body assembly of a dry water meter is provided on the inner side of the cavity wall at the opening of the cavity, and an external thread for use by the lock core cover of the dry water meter and the middle cover of a wet water meter is provided on the outer side wall of the cavity wall at a position opposite to the internal thread.

[0019] An annular groove for installing a water seal ring is provided on the top surface of the cavity wall between the internal thread and the external thread.

[0020] The case is made of metal or hard non-metallic materials.

[0021] The watch case is made of copper, stainless steel, iron, or hard plastic in one piece.

[0022] The dry water meter of the present invention includes a casing, an impeller chamber, a counter assembly, and a lock cylinder inner cover made of transparent material, characterized in that: the casing is the casing of the water meter of the present invention.

[0023] The dry water meter also includes a lock cylinder cover that is open at both the top and bottom and is cylindrical in shape. The lower peripheral wall of the lock cylinder cover is provided with an internal thread that can be screwed into the external thread on the meter case. At the top of the lock cylinder cover, there is an annular retaining plate extending in the direction of the lock cylinder cover axis. A lock cylinder inner cover made of transparent material is fastened to the counter assembly. The cap of the lock cylinder inner cover is fixed to the support plate by screws or pins. When the lock cylinder cover is screwed onto the meter case, the annular retaining plate presses against the cap and fastens the lock cylinder inner cover, the counter assembly and the support plate to the meter case.

[0024] A connecting seat for installing the top cover is provided on the outer wall of the upper part of the lock cylinder cover.

[0025] The wet water meter of the present invention includes a housing, an impeller chamber, a movement holder, a counter assembly, a transparent cover, and a middle cover. The impeller chamber is placed inside the cavity of the housing, the movement holder is placed on top of the impeller chamber, the counter assembly is assembled inside the movement holder, and the starting gear in the gear set of the counter assembly meshes with the axle gear of the impeller in the impeller chamber. The middle cover seals the counter assembly and the movement holder inside the housing. The feature is that the housing is the housing of the water meter of the present invention, and correspondingly, the inner sidewall of the lower end of the middle cover is provided with an inner thread that is adapted to be screwed onto the outer thread of the upper end of the cavity of the housing.

[0026] The gear set in the counter assembly has its corresponding movement cup portion exposed above the opening of the cavity.

[0027] The inner cover is cylindrical, with an annular retaining plate extending towards the axis of the inner cover at its upper end. The apparent transparent cover is a cylindrical inner cover of the lock cylinder that is fastened onto the movement base cup. The lower end of the inner cover of the lock cylinder abuts against the top surface of the cavity wall of the watch case. The top periphery of the inner cover of the lock cylinder is set with a downwardly recessed annular pressing position. When the outer cover of the lock cylinder is fastened onto the inner cover of the lock cylinder and screwed onto the watch case, the annular retaining plate on the outer cover of the lock cylinder abuts against the annular pressing position and secures the inner cover of the lock cylinder, the movement base cup, and the counter assembly to the watch case.

[0028] The inner cover is a stepped cylindrical shape, divided into an upper cylindrical part and a lower cylindrical part. The diameter of the upper cylindrical part is smaller than that of the lower cylindrical part. The inner thread of the cover is provided in the lower cylindrical part. The stepped part formed between the upper and lower cylindrical parts abuts against the top surface of the cavity wall of the watch case. An inwardly extending annular retaining plate is provided at the top of the upper cylindrical part. The movement cup is cylindrical, and the counter assembly is installed in the movement cup. The transparent cover is pressed against the top of the movement cup. When the inner cover is screwed onto the watch case, the inner cover water-seals the movement cup and the counter assembly within the space enclosed by the transparent cover and the watch case.

[0029] The top of the inner cover is provided with an inwardly extending annular retaining plate that presses the bottom outer edge of the inner cover of the lock cylinder, which is attached to the movement cup, against the top surface of the cavity wall of the watch case. The movement cup and the counter assembly are water-tightly sealed within the space enclosed by the inner cover of the lock cylinder and the watch case.

[0030] The water meter casing of this invention has threads on both the inner and outer peripheral walls of the casing cavity, making it suitable for both dry and wet water meters. Compared to existing wet water meter casings, it significantly reduces material costs. Using the casing of this invention brings unexpected and significant benefits to the procurement, material preparation, storage, and standardized management of the casing. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a dry water meter in the prior art.

[0032] Figure 2 for Figure 1 An explosion diagram.

[0033] Figure 3 This is a schematic diagram of a wet water meter in the prior art.

[0034] Figure 4 for Figure 3 An explosion diagram.

[0035] Figure 5 This is a schematic diagram of the water meter casing of the present invention.

[0036] Figure 6 For application Figure 5 A schematic diagram of a dry water meter with its casing assembled.

[0037] Figure 7 for Figure 6 An explosion diagram.

[0038] Figure 8 For application Figure 5 A schematic diagram of Example 1 of a wet water meter with a housing assembly.

[0039] Figure 9 for Figure 8 An explosion diagram.

[0040] Figure 10 for Figure 8 Sectional view along the AA direction.

[0041] Figure 11 For application Figure 5 A longitudinal sectional view of embodiment 2 of a wet water meter with a housing assembly.

[0042] Figure 12 For application Figure 5 A longitudinal sectional view of embodiment 3 of a wet water meter with a housing assembly.

[0043] The attached figures are labeled as follows: Case 1; Cavity 11; Cavity wall 12; Internal thread 13; External thread 14; 2. Dry water meter; Pressure ring 21; Lock cylinder outer cover 22; Lock cylinder inner cover 23; Slot 24; Inner thread of cover 25; Annular retaining plate 26; Cap 27; Support plate 28; Top cover 29; 3. Wet water meter; 31. Movement seat cup; 32. Transparent cover plate; 33. Annular pressure plate; 35. Middle cover; 36. Upper cylinder; 37. Lower cylinder; Counter assembly 4; impeller assembly 5. Detailed Implementation

[0044] I. Watch Case 1 like Figure 5 The water meter casing 1 of the present invention is made of metal or hard non-metallic material, preferably copper, stainless steel, iron or hard plastic. The main body of the casing 1 is integrally formed by injection molding, casting or hot stamping process.

[0045] The casing 1 of this invention is mainly used in rotary vane water meters, and its main application feature is that it can be used in both dry water meters 2 and wet water meters 3.

[0046] The improvement is that threaded connection structures are provided on both the inner and outer peripheral walls of the cavity wall 12 of the water meter casing 1.

[0047] The watch case 1 of the present invention is provided with a cavity 11 for accommodating and installing the impeller assembly 5. The water inlet pipe and water outlet pipe provided on both sides of the watch case 1 are respectively connected to the cavity 11. The wall of the watch case 1 corresponding to the cavity 11 extends upward to a set height to form a cylindrical cavity wall 12. The upper port of the cavity wall 12 is open.

[0048] 1. When the housing 1 is applied to the dry water meter 2, the thread provided on the inner peripheral wall of the cavity wall 12 (hereinafter referred to as the internal thread 13) is used to screw the pressure ring 21 in the middle body assembly of the dry water meter 2, and the thread provided on the outer peripheral wall of the cavity wall 12 (hereinafter referred to as the external thread 14) is used to screw the lock core cover 22 of the dry water meter 2.

[0049] 2. When the housing 1 is applied to the wet water meter 3, the internal thread 13 can be left unused, and the external thread 14 is used to screw the middle cover 35 of the wet water meter 3.

[0050] 3. An annular groove is provided on the top surface of the cavity wall 12 between the internal thread 13 and the external thread 14, and a water seal ring is installed in the annular groove.

[0051] II. Dry water meter 2 like Figure 6 , Figure 7 As shown, the dry water meter 2 of the present invention includes a casing 1, an impeller chamber, a counter assembly 4, and a lock cylinder inner cover 23 made of transparent material. It differs from the prior art dry water meters 2 mentioned in the "Background Art" section of this specification in the following main ways: 1. The groove 24 on the outer peripheral wall of the cavity wall 12 of the casing 1 used in the dry water meter 2 in the prior art is changed to the external thread 14.

[0052] 2. The existing shell ring and dust cover are combined into one design, which is a cylindrical lock cylinder cover 22 with open ends on both the upper and lower surfaces.

[0053] The lower peripheral wall inside the lock cylinder cover 22 is provided with a thread that is adapted to be screwed into the external thread 14 on the watch case 1 (hereinafter referred to as the internal thread 25). At the top of the lock cylinder cover 22, there is an annular retaining plate 26 extending in the direction of the axis of the lock cylinder cover 22.

[0054] The inner lock cylinder cover 23 is made of transparent material, preferably nylon or other transparent plastics of suitable strength. The inner lock cylinder cover 23 is shaped like a top hat, and it is installed in the inner space of the hat by the counter assembly 4. The brim 27 is fixed to the support plate 28 by screws. When the outer lock cylinder cover 22 is screwed onto the watch case 1, the annular retaining plate 26 of the outer lock cylinder cover 22 presses against the brim 27 and secures the inner lock cylinder cover 23, the counter assembly 4 and the support plate 28 to the watch case 1.

[0055] A connecting seat for installing a top cover 29 is provided on the outer wall of the upper part of the lock cylinder outer cover 22. The top cover 29 is used to cover the appearance panel of the top surface of the lock cylinder inner cover 23 to prevent dust and dirt from falling on the appearance panel.

[0056] Since the inner cover 23 of the lock cylinder of the dry water meter 2 is exposed to the atmosphere, its outer cover 22 is preferably made of ordinary plastic.

[0057] 3. Wet water meter like Figures 8-12 As shown, the wet water meter 3 of the present invention includes a casing 1, an impeller chamber, a movement cup 31, a counter assembly 4, a transparent cover 32, and a middle cover 35. The impeller chamber is placed inside the cavity 11 of the casing 1, the movement cup 31 is placed on top of the impeller chamber, the counter assembly 4 is assembled inside the movement cup 31, the starting gear in the gear set of the counter assembly 4 meshes with the axle gear of the impeller in the impeller chamber, and the middle cover 35 seals the counter assembly 4 and the movement cup 31 inside the casing 1. It differs from the prior art wet water meters 3 mentioned in the "Background Art" section of this specification in the following main aspects: 1. The length of the middle cover 35 in the prior art is increased and the smooth surface on the inner peripheral wall of the cavity wall 12 of the meter shell 1 used in the wet water meter 3 is changed to the internal thread 13.

[0058] 2. Reduce the height of the cavity wall 12 of the watch case 1 so that the part of the movement cup 31 corresponding to the gear set in the counter assembly 4 is exposed above the opening at the upper end of the cavity wall 12.

[0059] 3. The combination of the middle cover 35, the apparent transparent cover plate 32, and the movement cup 31 is preferably adopted in the following ways: 1) such as Figures 8-10 As shown in Example 1, the middle cover 35 adopts the lock cylinder outer cover 22 used in the dry water meter 2 of the present invention, and the apparent transparent cover 32 adopts a cover similar to the lock cylinder inner cover 23 made of transparent material of the dry water meter 2 of the present invention. The difference is that the apparent transparent cover 32 is cylindrical and does not have an outwardly extending brim 27 at its lower end. The lock cylinder inner cover 23 is fastened on the movement seat cup 31. Specifically: The lock cylinder outer cover 22 is made of metal. At the top of the lock cylinder outer cover 22, there is an annular retaining plate 26 that extends in the direction of the lock cylinder outer cover 22 axis and can be locked on the periphery of the surface panel at the top of the lock cylinder inner cover 23.

[0060] The inner lock cylinder cover 23 is preferably made of nylon or other transparent plastic of suitable strength. The inner lock cylinder cover 23 is shaped like a top hat. The counter assembly 4 is installed in the space inside the hat. The lower end of the inner lock cylinder cover 23 presses against the top surface of the cavity wall 12 of the watch case 1 to prevent water from leaking out of the movement cup 31. The top periphery of the inner lock cylinder cover 23 is set with a downwardly recessed annular pressure position 33. When the outer lock cylinder cover 22 is fastened onto the inner lock cylinder cover 23 and screwed onto the watch case 1, the annular retaining plate 26 on the outer lock cylinder cover 22 presses against the annular pressure position 33 and fastens the inner lock cylinder cover 23, the movement cup 31 and the counter assembly 4 to the watch case 1.

[0061] Preferably, a plurality of recessed spaces are evenly spaced on the peripheral wall of the lock cylinder inner cover 23 to prevent deformation of the lock cylinder inner cover 23 during injection molding.

[0062] 2) such as Figure 11 As shown in Embodiment 2, the middle cover 35 adopts the lock cylinder outer cover 22 of the dry water meter 2 of the present invention, and the apparent transparent cover plate 32 adopts the lock cylinder inner cover 23 made of the transparent material of the dry water meter 2 of the present invention. The installation method of the lock cylinder outer cover 22 and the lock cylinder inner cover 23 is different from the installation method of the dry water meter 2, as follows: An annular retaining plate 26 is provided at the top of the outer cover 22 of the lock cylinder, extending inward and pressing the bottom outer edge of the inner cover 23 of the lock cylinder, which is attached to the movement base cup 31, against the top surface of the cavity wall 12 of the watch case 1. The movement base cup 31 and the counter assembly 4 are water-tightly sealed in the space enclosed by the inner cover 23 of the lock cylinder and the watch case 1.

[0063] The inner lock cylinder cover 23 is shaped like a top hat. The counter assembly 4 is installed in the space inside the hat. The brim 27 abuts against the top surface of the cavity wall 12. When the outer lock cylinder cover 22 is screwed onto the watch case 1, the annular retaining plate 26 of the outer lock cylinder cover 22 presses against the brim 27 and fastens the inner lock cylinder cover 23, the movement base cup 31, and the counter assembly 4, which are made of transparent material, to the watch case 1.

[0064] 3) The structure of the apparent transparent cover plate 32 remains unchanged.

[0065] like Figure 12As shown in Example 3, the height of the middle cover 35 is appropriately increased, and its shape is a stepped cylindrical shape, divided into an upper cylindrical part 36 and a lower cylindrical part 37. The diameter of the upper cylindrical part 36 is smaller than that of the lower cylindrical part 37. The inner thread 25 of the cover is provided in the lower cylindrical part 37. The stepped part formed between the upper cylindrical part 36 and the lower cylindrical part 37 abuts against the top surface of the cavity wall 12 of the watch case 1, that is, against the water seal ring. An inwardly extending annular retaining plate 26 is provided at the top of the upper cylindrical part 36.

[0066] The movement cup 31 is cylindrical, and the counter assembly 4 is installed inside the movement cup 31. The outer wall of the movement cup 31 abuts against the inner wall of the upper cylinder 36. The transparent cover 32 is pressed onto the top of the movement cup 31. When the middle cover 35 is screwed onto the watch case 1, the water seal gasket between the transparent cover 32 and the annular retaining plate 26 at the upper end of the middle cover 35 and the water seal ring on the top surface of the cavity wall 12 are pressed, which can effectively prevent water from leaking out of the movement cup 31. At the same time, the pressure of the water in the movement cup 31 on the cup wall of the movement cup 31 can be effectively transmitted to the middle cover 35, which has a certain strength.

[0067] 4) The structures of the inner cover 35 and the apparent transparent cover 32 remain unchanged, but the height of the inner cover 35 is appropriately increased. The movement holder 31 is a stepped barrel shape (not shown in the figure), divided into an upper barrel and a lower barrel. The diameter of the upper barrel is larger than the diameter of the lower barrel. The upper barrel is placed on the watch case 1, and the outer wall of the upper barrel abuts against the inner wall of the inner cover 35. The lower barrel is embedded in the watch case 1. The stepped portion formed between the upper barrel and the lower barrel abuts against the top surface of the cavity wall 12 of the watch case 1, that is, against the... On the water seal ring, the apparent transparent cover plate 32 is pressed against the top of the movement cup 31. When the middle cover 35 is screwed onto the watch case 1, the water seal gasket between the apparent transparent cover plate 32 and the annular retaining plate 26 at the upper end of the middle cover 35 and the water seal ring on the top surface of the cavity wall 12 are pressed against each other, thereby effectively preventing water leakage from the movement cup 31. At the same time, the pressure of the water in the movement cup 31 on the cup wall of the movement cup 31 can be effectively transmitted to the middle cover 35, which has a certain strength.

Claims

1. A water meter casing, comprising a cavity (11) for mounting an impeller chamber, characterized in that: An internal thread (13) for screwing the pressure ring (21) in the middle body assembly of the dry water meter (2) is provided on the inner side of the cavity wall (12) at the opening of the cavity (11). An external thread (14) for the lock core cover (22) of the dry water meter (2) and the middle cover (35) of the wet water meter (3) are provided on the outer wall of the cavity wall (12) opposite to the internal thread (13).

2. The water meter casing according to claim 1, characterized in that: An annular groove for installing a water seal ring is provided on the top surface of the cavity wall (12) between the internal thread (13) and the external thread (14).

3. The water meter casing according to claim 2, characterized in that: The case (1) is made of metal or hard non-metallic material.

4. The water meter casing according to claim 3, characterized in that: The case (1) is made of copper, stainless steel, iron or hard plastic in one piece.

5. A dry water meter, comprising a casing (1), an impeller chamber, a counter assembly (4), and a lock cylinder inner cover (23) made of transparent material, characterized in that: The casing (1) is the casing (1) of the water meter according to any one of claims 1-4.

6. The dry-type water meter according to claim 5, characterized in that: The dry water meter (2) also includes a lock cylinder cover (22) with open upper and lower ends and in the shape of a cylinder. The lower peripheral wall of the lock cylinder cover (22) is provided with an inner thread (25) that can be screwed into the external thread (14) on the meter case (1). An annular retaining plate (26) extending towards the axis of the lock cylinder cover (22) is provided at the top of the lock cylinder cover (22). A lock cylinder inner cover (23) made of transparent material is fastened on the counter assembly (4). The cap (27) of the lock cylinder inner cover (23) is fixed to the support plate (28) by screws or pins. When the lock cylinder cover (22) is screwed onto the meter case (1), the annular retaining plate (26) presses against the cap (27) and fastens the lock cylinder inner cover (23), the counter assembly (4) and the support plate (28) to the meter case (1).

7. The dry-type water meter according to claim 6, characterized in that: A connecting seat for installing the top cover (29) is provided on the outer side wall of the upper part of the lock cylinder cover (22).

8. A wet water meter, comprising a casing (1), an impeller chamber, a movement holder (31), a counter assembly (4), a transparent cover (32), and a middle cover (35), wherein the impeller chamber is placed inside the cavity (11) of the casing (1), the movement holder (31) is placed above the impeller chamber, the counter assembly (4) is assembled inside the movement holder (31), the starting gear in the gear set of the counter assembly (4) meshes with the axle gear of the impeller in the impeller chamber, and the middle cover (35) seals the counter assembly (4) and the movement holder (31) inside the casing (1), characterized in that: The housing (1) is the housing (1) of the water meter according to any one of claims 1-4. Correspondingly, the inner side wall of the lower end of the middle cover (35) is provided with an inner thread (25) that is adapted to be screwed onto the outer thread (14) on the upper end of the cavity (11) of the housing (1).

9. The wet water meter according to claim 8, characterized in that: The gear set in the counter assembly (4) has its corresponding movement cup (31) partially exposed above the opening of the cavity (11).

10. The wet water meter according to claim 9, characterized in that: The middle cover (35) is cylindrical, and an annular retaining plate (26) extending towards the axis of the middle cover (35) is provided at its upper end. The apparent transparent cover (32) is a straight cylindrical lock cylinder inner cover (23) that is fastened on the movement base cup (31). The lower end of the lock cylinder inner cover (23) abuts against the top surface of the cavity wall (12) of the watch case (1). The top periphery of the lock cylinder inner cover (23) is set as a downwardly recessed annular pressure position (33). When the lock cylinder outer cover (22) is fastened on the lock cylinder inner cover (23) and screwed onto the watch case (1), the annular retaining plate (26) on the lock cylinder outer cover (22) abuts against the annular pressure position (33) and fastens the lock cylinder inner cover (23), the movement base cup (31) and the counter assembly (4) to the watch case (1).

11. The wet water meter according to claim 9, characterized in that: The inner cover (35) is a stepped cylindrical shape, divided into an upper cylindrical part (36) and a lower cylindrical part (37). The diameter of the upper cylindrical part (36) is smaller than that of the lower cylindrical part (37). The inner thread (25) of the cover is provided in the lower cylindrical part (37). The stepped part formed between the upper cylindrical part (36) and the lower cylindrical part (37) presses against the top surface of the cavity wall (12) of the watch case (1). An inwardly extending annular retaining plate (26) is provided at the top of the upper cylindrical part (36). The movement cup (31) is a straight cylindrical shape. The counter assembly (4) is installed in the movement cup (31). The apparent transparent cover (32) is pressed on the top of the movement cup (31). When the inner cover (35) is screwed onto the watch case (1), the inner cover (35) water-seals the movement cup (31) and the counter assembly (4) in the space enclosed by the apparent transparent cover (32) and the watch case (1).

12. The wet water meter according to claim 9, characterized in that: The top of the middle cover (35) is provided with an inwardly extending lock cylinder inner cover (23) that presses the bottom outer edge of the lock cylinder inner cover (23) that covers the movement cup (31) against the top surface of the cavity wall (12) of the watch case (1). The movement cup (31) and the counter assembly (4) are water-tightly sealed in the space enclosed by the lock cylinder inner cover (23) and the watch case (1).

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