Suspension sealing liquid seal water meter

Abstract

The invention relates to a suspension sealing liquid seal water meter which comprises a water meter shell and a driving impeller, the water meter shell comprises a gear box base, a lower clamping plate and an upper clamping plate, a liquid seal cavity is formed between the upper clamping plate and the lower clamping plate, and the driving impeller is provided with an impeller shaft; the gear box base is provided with a first through hole for arranging the impeller shaft, and a first fit clearance is formed between the outer wall of the impeller shaft and the inner wall of the first through hole; the lower clamping plate is provided with a second through hole for arranging the impeller shaft, and a second fit clearance is formed between the outer wall of the impeller shaft and the inner wall of the second through hole; a sealing gap is formed between the gear box base and the lower clamping plate, and the outer side of the impeller shaft is sleeved with a suspension type sealing piece arranged at the sealing gap. A suspension fit clearance is formed between the impeller shaft and the suspension type sealing piece, and the suspension fit clearance is smaller than the first fit clearance and the second fit clearance. The liquid seal structure has the effects of prolonging the water retention time of the liquid seal cavity and maintaining the ideal rotation flexibility of the impeller at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of water-sealed water meters, and in particular to a suspended sealing liquid-sealed water meter. Background Art

[0002] Liquid-sealed water meters are water meters whose counting wheels or the entire counter used for meter reading are sealed with a liquid prepared with a certain concentration of glycerin.

[0003] A liquid-seal water meter consists of a meter housing and an impeller rotatably mounted therein. The meter housing includes a gear box base, a lower clamping plate positioned inside the gear box base, and an upper clamping plate that locks with the lower clamping plate and seals the upper opening of the gear box base. A liquid-seal chamber for the gear mechanism is formed between the lower and upper clamping plates. The gear box base has a first rotation hole for the impeller's rotation axis, and the lower clamping plate has a second rotation hole corresponding to the first rotation hole and for the impeller's rotation axis.

[0004] In conventional designs, the diameter of the second rotating hole is smaller than that of the first rotating hole, allowing the impeller's rotating shaft and the wall of the second rotating hole in the lower plate to cooperate to form a seal on the lower side of the liquid-seal chamber. The smaller the gap between the impeller's rotating shaft and the wall of the second rotating hole, the lower the probability of liquid leakage from the liquid-seal chamber and the greater the liquid-seal chamber's water-retention capacity. However, this also increases the probability of friction and adhesion between the impeller's rotating shaft and the wall of the second rotating hole. This creates a contradiction between how to reduce the gap between the impeller's rotating shaft and the wall of the second rotating hole and how to maintain the impeller's rotational flexibility. In other words, there is a contradiction between the long water retention period of the liquid-seal chamber of a liquid-seal water meter and the ideal rotational flexibility of the impeller.

[0005] In view of the above-mentioned related technologies, the inventor believes that it is necessary to provide a suspended sealing liquid water seal meter with a long water retention time and ideal impeller rotation flexibility. Summary of the Invention

[0006] In order to extend the water retention time of the liquid seal chamber while maintaining ideal rotation flexibility of the impeller, the present application provides a suspended seal liquid seal water meter.

[0007] The present application provides a suspended seal liquid seal water meter adopting the following technical solution: A suspended seal liquid-sealed water meter comprises a water meter housing and a driving impeller rotatably mounted on the water meter housing. The water meter housing comprises a gear box base, a lower clamping plate arranged inside the gear box base, and an upper clamping plate locked with the lower clamping plate and sealingly covering an upper end opening of the gear box base. A liquid-sealed chamber is formed between the upper and lower clamping plates. The driving impeller has an impeller shaft. The gear box base has a first through hole for rotatably arranging the impeller shaft. A first fitting gap is formed between an outer wall of the impeller shaft and an inner wall of the first through hole. The lower clamping plate has a second through hole for rotatably arranging the impeller shaft. A second fitting gap is formed between an outer wall of the impeller shaft and an inner wall of the second through hole. A sealing gap is formed between the gear box base and the lower clamping plate. A suspended sealing sheet is sleeved on the outer side of the impeller shaft and movably arranged up and down in the sealing gap. A suspended fitting gap is formed between the impeller shaft and the suspended sealing sheet. The suspended fitting gap is smaller than the first fitting gap, and the suspended fitting gap is smaller than the second fitting gap.

[0008] By adopting the above technical solution, a suspended sealing disc is sleeved on the outer side of the impeller shaft and movably arranged in the sealing gap between the gear box base and the lower clamping plate. When the driving impeller is not rotating, the suspended sealing disc sinks under the gravity of the liquid in the liquid seal chamber and adheres to the upper end surface of the gear box base, forming a seal. Because the suspended fit clearance formed between the suspended sealing disc and the impeller shaft is smaller than both the first fit clearance and the second fit clearance, the sealing performance is enhanced. Due to the tension of water molecules, the liquid seal chamber of the liquid-seal water meter retains water for a longer period of time. When the driving impeller rotates, it stirs the liquid in the sealing gap and moves the suspended sealing disc with it. At this time, the suspended sealing disc is suspended in the liquid. Due to its small size, its mass and inertia are negligible, and it has little impact on the rotational flexibility of the driving impeller. This extends the water retention time of the liquid seal chamber while maintaining the ideal rotational flexibility of the driving impeller.

[0009] Optionally, the lower clamping plate has a first protrusion, the gear box base is provided with an arrangement groove for the side wall of the first protrusion to abut against, the outer diameter of the suspended sealing sheet is smaller than the aperture of the arrangement groove, the sealing gap is the gap between the outer wall of the first protrusion and the arrangement groove, and the first protrusion is provided with a connecting structure connected to the second fitting gap.

[0010] By adopting the above technical solution, the first protrusion of the lower clamping plate cooperates with the arrangement groove of the gear box base, so that the suspended sealing piece can move up and down in the sealing gap. When the operator pours liquid into the liquid seal chamber, the suspended sealing piece will rise and abut the lower end face of the first protrusion. Since the outer diameter of the suspended sealing piece is smaller than the aperture of the arrangement groove, the first protrusion is provided with a connecting structure connected to the second fitting gap, so that the liquid can enter the second fitting gap through the connecting structure, which helps to ensure the efficiency of pouring liquid.

[0011] Optionally, the communication structure is a plurality of abutment protrusions provided circumferentially on the lower end surface of the first convex portion for the suspension sealing sheet to abut against.

[0012] By adopting the above technical solution, a connecting structure is disclosed in which the first protrusion is connected to the second fitting gap. The lower end surface of the first protrusion is circumferentially provided with a plurality of abutment protrusions. When the suspended sealing piece rises, it abuts against these abutment protrusions. At this time, the first protrusion and the suspended sealing piece are in point-to-surface contact. The liquid poured into the liquid seal chamber by the operator can enter the second fitting gap through the gap between the first protrusion and the suspended sealing piece, effectively realizing the smooth flow of liquid into the liquid seal chamber.

[0013] Optionally, the connecting structure is a plurality of connecting grooves circumferentially provided on the lower end surface of the first protrusion, and two ends of the connecting grooves are respectively connected to the inner wall and the outer wall of the first protrusion.

[0014] By adopting the above technical solution, a connecting structure is disclosed in which the first protrusion is connected to the second fitting gap. A plurality of connecting grooves are provided circumferentially on the lower end surface of the first protrusion. When the suspended sealing piece rises, since the two ends of the connecting grooves are respectively connected to the inner wall and outer wall of the first protrusion, the liquid poured into the liquid seal chamber by the operator can enter the second fitting gap through the connecting grooves, effectively realizing the smooth flow of liquid to the liquid seal chamber.

[0015] Optionally, the lower splint has a second protrusion, the gear box base is provided with a third protrusion arranged opposite to the second protrusion, the sealing gap is the gap between the second protrusion and the third protrusion, and the lower splint is provided with a connecting through hole for injecting liquid into the liquid seal chamber.

[0016] By adopting the above technical solution, the sealing gap of the suspended sealed liquid-sealed water meter is formed by the gap between the second protrusion of the lower splint and the third protrusion of the gear box base. When the operator pours liquid into the liquid seal chamber, the suspended sealing piece will rise and abut the lower end surface of the second protrusion. Since the lower splint is provided with a connecting through hole, the liquid can enter the second fitting gap through the connecting through hole, which helps to ensure the efficiency of pouring liquid.

[0017] Optionally, the first fitting clearance is 0.3-0.4 mm, and the second fitting clearance is 0.4-0.5 mm.

[0018] By adopting the above technical solution, since the first fitting clearance is set to 0.3-0.4mm and the second fitting clearance is set to 0.4-0.5mm, the risk of liquid leakage in the liquid seal chamber is reduced while the risk of the driving impeller being stuck due to the time-dependent deformation of surrounding parts is reduced, thereby ensuring the flexibility of the impeller shaft during rotation, thereby achieving a balance between the water retention time of the liquid seal chamber and the rotation flexibility of the driving impeller.

[0019] Optionally, the suspension fit clearance is 0.15-0.25 mm.

[0020] By adopting this technical solution, the suspension fit clearance is set to 0.15-0.25mm, ensuring a tighter fit between the impeller shaft and the suspension seal. This strengthens the sealing performance, effectively reduces the probability of liquid leakage within the liquid seal chamber, and prolongs the water retention period. At the same time, this clearance range ensures that the suspension seal can maintain a good suspension state during impeller shaft rotation, avoiding excessive friction with the impeller shaft, thereby ensuring the flexibility of driving the impeller rotation.

[0021] Optionally, the upper splint is provided with a snap-fitting groove that cooperates with the gear box base, and a sealing ring is provided on the inner wall of the snap-fitting groove.

[0022] By adopting the above technical solution, the sealing performance between the upper clamping plate and the gear box base is significantly improved. Specifically, by providing a sealing ring on the inner wall of the clamping groove of the upper clamping plate, the sealing ring has inherent elasticity, which makes the connection between the upper clamping plate and the gear box base more tightly, thereby reducing the probability of external air entering the liquid seal chamber through the connection between the upper clamping plate and the gear box base, facilitating the liquid seal of the gear box and thus extending the water retention time of the liquid seal chamber.

[0023] Optionally, the upper clamping plate is provided with a sealing ring groove on the inner wall of the clamping groove, and the sealing ring is an O-ring and is arranged in the sealing ring groove.

[0024] By adopting the above technical solution, a sealing ring groove is provided on the inner wall of the clamping groove for the sealing ring. The use of an O-ring provides a more reliable seal, effectively improving the water retention capacity of the liquid seal chamber. Furthermore, the O-ring has excellent elasticity and can automatically adapt to slight deformations and tolerances during the assembly process of the upper clamping plate and the gear box base, thereby ensuring a stable seal and further extending the water retention time of the liquid seal chamber.

[0025] Optionally, the sealing ring is a flat gasket.

[0026] By adopting this technical solution, the sealing ring adopts a flat washer design, which can provide a stable sealing effect and simplify the processing and assembly of the sealing structure. Compared with O-rings, flat washers are more uniform when compressed and deformed, and can form a more reliable sealing contact between the upper clamping plate and the gear box base, thereby further extending the water retention time of the liquid-sealed water meter.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. A suspended seal liquid-sealed water meter, wherein a suspended seal sheet is sleeved on the outer side of the impeller shaft. The suspended seal sheet is movably arranged in the sealing gap between the gear box base and the lower clamping plate. The suspended fit gap formed between the suspended seal sheet and the impeller shaft is smaller than not only the first fit gap but also the second fit gap, thereby extending the water retention time of the liquid seal chamber while maintaining the ideal rotational flexibility of the driving impeller. 2. The sealing performance is enhanced by providing a suspended sealing sheet, which allows the first and second fitting clearances to be appropriately increased to reduce the risk of the driving impeller being stuck due to the time-dependent deformation of surrounding parts; 3. By opening a sealing ring groove and setting a sealing ring on the inner wall of the clamping groove of the upper splint, the connection between the upper splint and the gear box base is made tighter, thereby reducing the probability of external gas entering the liquid seal chamber from the connection between the upper splint and the gear box base, which helps to liquid seal the gear box and thus prolong the water retention time of the liquid seal chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the suspended sealing liquid water seal meter in Example 1.

[0029] Figure 2 It is a cross-sectional schematic diagram of the cooperation between the gear box base and the upper splint in Example 1.

[0030] Figure 3 It is a partial cross-sectional schematic diagram of another form of the sealing ring in the embodiment.

[0031] Figure 4 yes Figure 1 A partial enlarged view of point A in the middle.

[0032] Figure 5 It is a cross-sectional schematic diagram of the connecting structure in Example 2.

[0033] Figure 6 This is a cross-sectional schematic diagram of the sealing gap structure in Example 3 Explanation of the accompanying drawings: 1. Water meter housing; 2. Driving impeller; 21. Impeller shaft; 3. Gear box base; 31. First through hole; 32. First fitting gap; 33. Arrangement groove; 34. Third convex portion; 4. Lower clamping plate; 41. Second through hole; 42. Second fitting gap; 43. First convex portion; 431. Abutment protrusion; 432. Connecting through groove; 433. Liquid hole; 44. Second convex portion; 45. Connecting through hole; 46. Third through hole; 47. Mounting bolt; 5. Upper clamping plate; 51. Clamping groove; 52. Sealing ring groove; 53. O-ring; 54. Flat washer; 55. Mounting threaded hole; 6. Liquid seal chamber; 7. Sealing gap; 8. Suspended sealing plate; 81. Suspended fitting gap. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-6 This application is described in further detail.

[0035] Example 1: The embodiment of the present application discloses a suspended sealing liquid water seal meter. Figure 1 The suspended seal liquid-sealed water meter includes a water meter housing 1 and a driving impeller 2 rotatably mounted on the water meter housing 1, and the driving impeller 2 has an impeller shaft 21. The water meter housing 1 includes a gear box base 3, a lower clamping plate 4 arranged on the inner side of the gear box base 3, and an upper clamping plate 5 sealingly covering the upper end opening of the gear box base 3, wherein the upper clamping plate 5 is locked with the lower clamping plate 4, and a liquid seal chamber 6 for arranging the gear structure is formed between the upper clamping plate 5 and the lower clamping plate 4. In this embodiment, the lower clamping plate 4 is provided with a third through hole 46 in the circumference and a mounting bolt 47 is installed in the third through hole 46. The bottom of the upper clamping plate 5 has a mounting threaded hole 55 in the circumference that corresponds to the third through hole 46 and cooperates with the mounting bolt 47. The upper clamping plate 5 and the lower clamping plate 4 are fixed by threads, and the connection strength is ideal.

[0036] refer to Figure 2The upper clamping plate 5 is provided with a clamping groove 51 for clamping with the gear box base 3, and a sealing ring groove 52 is formed on the inner wall of the clamping groove 51. A sealing ring is arranged in the sealing ring groove 52, wherein the sealing ring is used to seal against the gear box base 3. In this embodiment, the sealing ring is an O-ring 53. The O-ring 53 has good elasticity. During the assembly process of the upper clamping plate 5 and the gear box base 3, it can automatically adapt to slight deformation and tolerance, thereby enhancing the quality of the joint surface between the upper clamping plate 5 and the gear box base 3 and ensuring the stability of the seal, reducing the probability of external gas entering the liquid seal chamber 6 from the connection between the upper clamping plate 5 and the gear box base 3, and further extending the water retention time of the liquid seal chamber 6. At the same time, since the sealing effect of the conventional structure also depends on the strength of the bonding force between the upper clamping plate 5 and the gear box base 3, if the bonding force is too large, the upper clamping plate 5 or the gear box base 3 will be deformed, thereby affecting various precisions. If the bonding force is too small, the sealing effect will be poor and the liquid will leak quickly. The provision of the sealing ring effectively avoids these scenarios.

[0037] In other embodiments, the upper clamping plate 5 does not have a sealing ring groove 52, and the sealing ring is a flat washer 54. Figure 3 The flat washer 54 is more uniformly compressed and deformed, creating a reliable seal between the upper clamping plate 5 and the gear box base 3, providing a stable sealing effect. Compared to the O-ring 53, the flat washer 54 simplifies the processing and assembly of the sealing structure between the gear box base 3 and the engaging groove 51 while ensuring a good sealing effect.

[0038] refer to Figure 4 The central axis of the gear box base 3 is provided with a first through-hole 31 for the rotational arrangement of the impeller shaft 21. The lower clamping plate 4 is provided with a second through-hole 41 for the rotational arrangement of the impeller shaft 21. The first through-hole 31 and the second through-hole 41 are coaxial. A first fitting clearance 32 is formed between the outer wall of the impeller shaft 21 and the inner wall of the first through-hole 31, and a second fitting clearance 42 is formed between the outer wall of the impeller shaft 21 and the inner wall of the second through-hole 41. In this embodiment, the first fitting clearance 32 is 0.3-0.4 mm, and the second fitting clearance 42 is 0.4-0.5 mm.

[0039] refer to Figure 4The bottom of the lower clamping plate 4 is provided with a first protrusion 43, and the gear box base 3 is provided with a placement groove 33 for the first protrusion 43. The outer wall of the first protrusion 43 abuts the inner wall of the placement groove 33, forming a sealing gap 7 between the outer wall of the first protrusion 43 and the placement groove 33. A suspended sealing piece 8 is sleeved on the impeller shaft 21 and is movably arranged in the sealing gap 7. At the same time, a suspended fit gap 81 is formed between the outer wall of the impeller shaft 21 and the suspended sealing piece 8. The suspended fit gap 81 is 0.15-0.25mm. Because the suspended fit gap 81 is smaller than not only the first fit gap 32 but also the second fit gap 42, the sealing performance is enhanced. Under the action of the tension of the water molecules, the water retention time of the liquid seal chamber 6 of the liquid-sealed water meter is extended. In this embodiment, the thickness of the suspended sealing sheet 8 is 0.45-0.55 mm. Due to its small geometric size, its mass and inertia are negligible, and it has almost no effect on the flexibility of the driving impeller 2, thereby maintaining the ideal rotation flexibility of the driving impeller 2.

[0040] refer to Figure 4 The outer diameter of the suspended sealing piece 8 is smaller than the aperture of the arrangement groove 33 , and the first protrusion 43 is provided with a communication structure connected to the second fitting gap 42 .

[0041] In this embodiment, the connecting structure is abutment protrusions 431 uniformly spaced circumferentially on the lower end surface of the first protrusion 43. When the operator pours liquid into the liquid seal chamber 6, the suspended sealing piece 8 will rise and abut against the abutment protrusions 431 on the lower end surface of the first protrusion 43. Since there is still a certain gap between the first protrusion 43 and the suspended sealing piece 8 at this time, the liquid poured into the liquid seal chamber 6 by the operator can flow smoothly and enter the second fitting gap 42, thereby ensuring the efficiency of liquid injection.

[0042] The implementation principle of a suspended seal liquid-sealed water meter in the embodiment of the present application is as follows: the suspended sealing piece 8 is sleeved on the outer side of the impeller shaft 21 and arranged in the sealing gap 7 between the gear box base 3 and the lower clamping plate 4. The suspended fitting gap 81 formed between the suspended sealing piece 8 and the impeller shaft 21 is smaller than the first fitting gap 32 and smaller than the second fitting gap 42. When the driving impeller 2 is not rotating, the suspended sealing piece 8 will sink under the action of the gravity of the liquid and stick to the upper end surface of the gear box base 3 to form a seal. Since the suspended fitting gap 81 is smaller than the first fitting gap 32, the sealing effect is enhanced, thereby extending the water retention time of the liquid seal chamber 6; and when the driving impeller 2 rotates, it will stir the liquid in the sealing gap 7 and drive the suspended sealing piece 8 to move together. At this time, the suspended sealing piece 8 is in a suspended state in the liquid. Due to its small geometric size, its mass and inertia can be ignored, which has almost no effect on the flexibility of the driving impeller 2, thereby maintaining the ideal rotation flexibility of the driving impeller 2.

[0043] Example 2: The difference between this embodiment and the first embodiment lies in the different communication structure of the first protrusion 43 , while the rest of the structure remains the same as the first embodiment.

[0044] refer to Figure 5 The connecting structure comprises connecting grooves 432 evenly spaced circumferentially on the lower end surface of the first protrusion 43. The ends of the connecting grooves 432 are connected to the inner and outer walls of the first protrusion 43, respectively. Liquid holes 433 are formed where the connecting grooves communicate with the outer wall of the first protrusion 43. The inner diameter of the liquid hole 433 is larger than the outer diameter of the suspended sealing sheet 8.

[0045] When the operator pours liquid into the liquid seal chamber 6, the suspended sealing piece 8 will rise and abut against the lower end surface of the first protrusion 43. At this time, the liquid can enter the second fitting gap 42 through the connecting groove 432, thereby effectively realizing the smooth flow of liquid into the liquid seal chamber 6 and ensuring the efficiency of liquid filling.

[0046] Example 3: The difference between this embodiment and embodiment 1 lies in the structure of the sealing gap 7 formed between the gear box base 3 and the lower clamping plate 4. The remaining structures are consistent with those of embodiment 1.

[0047] refer to Figure 6 The lower clamping plate 4 has a second protrusion 44, and the gear box base 3 has a third protrusion 34. The second protrusion 44 and the third protrusion 34 are arranged opposite each other, and the sealing gap 7 is the gap between the second protrusion 44 and the third protrusion 34. The lower clamping plate 4 also has a connecting hole 45 for injecting liquid into the liquid seal chamber 6. The connecting hole 45 is located on the side of the lower clamping plate 4 away from the second protrusion 44 and is parallel to the axis of the impeller shaft 21. When the operator injects liquid into the liquid seal chamber 6, the suspended sealing piece 8 rises and abuts the lower end surface of the second protrusion 44. Because the lower clamping plate 4 has the connecting hole 45, the liquid can enter the liquid seal chamber 6 through the connecting hole 45 on the lower clamping plate 4, thereby ensuring the efficiency of liquid injection.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A suspended sealing liquid water seal meter, characterized in that: The invention comprises a water meter housing (1) and a driving impeller (2) rotatably mounted on the water meter housing (1); the water meter housing (1) comprises a gear box base (3), a lower clamping plate (4) arranged on the inner side of the gear box base (3), and an upper clamping plate (5) locked with the lower clamping plate (4) and sealingly covering the upper end opening of the gear box base (3); a liquid seal chamber (6) is formed between the upper clamping plate (5) and the lower clamping plate (4); the driving impeller (2) has an impeller shaft (21); the gear box base (3) has a first through hole (31) for rotatably arranging the impeller shaft (21); a first fitting gap (32) is formed between the outer wall of the impeller shaft (21) and the inner wall of the first through hole (31) The lower clamping plate (4) has a second through hole (41) for rotatably arranging the impeller shaft (21), and a second fitting gap (42) is formed between the outer wall of the impeller shaft (21) and the inner wall of the second through hole (41); a sealing gap (7) is formed between the gear box base (3) and the lower clamping plate (4), and a suspended sealing sheet (8) is sleeved on the outer side of the impeller shaft (21) and is movably arranged at the sealing gap (7); a suspended fitting gap (81) is formed between the impeller shaft (21) and the suspended sealing sheet (8), and the suspended fitting gap (81) is smaller than the first fitting gap (32), and the suspended fitting gap (81) is smaller than the second fitting gap (42).

2. A suspended sealing liquid-sealed water meter according to claim 1, characterized in that: The lower clamping plate (4) has a first convex portion (43), the gear box base (3) is provided with an arrangement groove (33) for the side wall of the first convex portion (43) to abut against and arrange, the outer diameter of the suspended sealing sheet (8) is smaller than the aperture of the arrangement groove (33), the sealing gap (7) is the gap between the outer wall of the first convex portion (43) and the arrangement groove (33), and the first convex portion (43) is provided with a connecting structure connected to the second fitting gap (42).

3. A suspended sealing liquid-sealed water meter according to claim 2, characterized in that: The communication structure is a plurality of abutment convex points (431) provided circumferentially on the lower end surface of the first convex portion (43) for the suspension sealing sheet (8) to abut against.

4. A suspended sealing liquid-sealed water meter according to claim 2, characterized in that: The communication structure is a plurality of connecting grooves (432) provided circumferentially on the lower end surface of the first convex portion (43), and the two ends of the connecting grooves (432) are respectively connected to the inner wall and the outer wall of the first convex portion (43).

5. A suspended seal liquid-sealed water meter according to claim 1, characterized in that: The lower clamping plate (4) has a second protrusion (44), the gear box base (3) is provided with a third protrusion (34) arranged opposite to the second protrusion (44), the sealing gap (7) is the gap between the second protrusion (44) and the third protrusion (34), and the lower clamping plate (4) is provided with a connecting through hole (45) for injecting liquid into the liquid seal chamber (6).

6. A suspended seal liquid-sealed water meter according to claim 1, characterized in that: The first fitting clearance (32) is 0.3-0.4 mm, and the second fitting clearance (42) is 0.4-0.5 mm.

7. A suspended sealing liquid-sealed water meter according to claim 1, characterized in that: The suspension fit gap (81) is 0.15-0.25 mm.

8. The suspended seal liquid-sealed water meter according to claim 1, characterized in that: The upper clamping plate (5) is provided with a clamping groove (51) that cooperates with the gear box base (3), and a sealing ring is provided on the inner wall of the clamping groove (51).

9. A suspended sealing liquid-sealed water meter according to claim 8, characterized in that: The upper clamping plate (5) is provided with a sealing ring groove (52) on the inner wall of the clamping groove (51); the sealing ring is an O-ring (53) and is arranged in the sealing ring groove (52).

10. A suspended sealing liquid-sealed water meter according to claim 8, characterized in that: The sealing ring is a flat washer (54).

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