Movement positioning structure of a volumetric water meter

Abstract

The present invention provides a movement positioning structure of a volumetric water meter, which belongs to the technical field of water meters. It solves the problem of how to improve the service life of a water meter. In the movement positioning structure of the volumetric water meter, the volumetric water meter includes a shell with a counter fixed inside, the movement is detachably connected in the shell and one side is against the counter, the shell has two side-facing limit plates radially, the positioning structure includes two limit blocks detachably connected in the shell and an elastic member, one side of the two limit blocks is against the other side of the movement, the other side of the two limit blocks has a limit inclined surface against the two limit plates, the elastic member elastically acts between the two limit blocks, and under the elastic action of the elastic member, the two limit blocks can move back to back and make the limit inclined surface press against the limit plate. The movement positioning structure of the volumetric water meter can improve the service life of the water meter.

Description

Technical Field

[0001] The invention belongs to the technical field of water meters and relates to a movement positioning structure of a volumetric water meter. Background Art

[0002] Volumetric water meter, also known as piston water meter, is a fixed displacement water meter. It calculates water consumption by driving the piston through the fluid that fills the shell and discharges it outward from the shell.

[0003] From the piston volumetric water meter metering box disclosed in the Chinese patent (authorization announcement number: CN202158881U), it can be known that it includes an upper shell, a lower shell, a metering mechanism, a sealing counter, and a clamp assembly; the key point is that a gap is provided between the outer diameter of the metering mechanism and the inner diameter of the lower shell, and a check valve assembly is provided at the water inlet of the inner diameter of the lower shell, and the check valve assembly is connected to the metering chamber insert of the metering mechanism; the upper shell is provided with a water outlet. The bottom of the lower shell is provided with a raised bottleneck, the bottleneck at the bottom of the lower shell is the water inlet, and the bottleneck at the top of the lower shell is provided with a check valve assembly. The bottom of the metering mechanism is provided with a water inlet hole and a water filter, and the top is provided with a water outlet hole that communicates with the upper shell.

[0004] Combining the text contents recorded in paragraphs 0013 and 0014 of the specification of Chinese patent CN202158881U and the accompanying drawings, it can be seen that the metering mechanism transfers kinetic energy to the gear system through the fork lever, and is connected through the worm in the gear system and the cross gear of the sealed counter, thereby driving the sealed counter to work and ensuring that the user can check the actual water consumption through the sealed counter.

[0005] It should be explained first that the gear train, also known as the movement, is formed by assembling and detachably connecting a number of transmission gears with two plywood. The two plywood are arranged opposite to each other to form an installation space between them. A number of transmission gears are installed between the two plywood in a planned layout and mesh for transmission. The input gear is connected to the metering mechanism through a fork rod, and the output gear is connected to the cross gear, so as to ensure the stable installation of the gear train while realizing power transmission.

[0006] In actual use, although the connection between the input gear and the output gear has a certain positioning effect on the gear system, the impact of the fluid will cause the movement to shake. If things go on like this for a long time, it is very likely to cause increased wear on the input gear and the output gear, or cause the overall position of the gear system to shift, making it impossible to effectively transmit power between the metering mechanism and the sealed counter, seriously affecting the service life of the water meter. Summary of the invention

[0007] The purpose of the present invention is to solve the above problems in the prior art and to propose a movement positioning structure for a volumetric water meter. The technical problem to be solved by the present invention is: how to increase the service life of the water meter.

[0008] The objectives of the present invention can be achieved through the following technical solutions: a movement positioning structure of a volumetric water meter, the volumetric water meter includes a shell with a counter fixed inside, the movement is detachably connected to the shell and one side is abutted against the counter, the shell has two limit plates with opposite sides in the radial direction, the positioning structure includes two limit blocks detachably connected to the shell and an elastic member, one side of the two limit blocks is abutted against the other side of the movement, the other side of the two limit blocks has a limit inclined surface abutted against the two limit plates, the elastic member elastically acts between the two limit blocks, and under the elastic action of the elastic member, the two limit blocks can move away from each other and make the limit inclined surface abut against the limit plate.

[0009] The movement positioning structure of the volumetric water meter uses the shell as a carrier, and the counter and the movement are both installed in the shell. It should be noted that the shell mentioned in this case is the upper shell in the prior art, and the counter is installed in the shell and positioned through the installation port opened in the shell. The specific structure of the movement has been introduced in the background technology, so it will not be described in detail. The movement is installed in the shell and one side is against the counter. Its input gear is meshed with the metering mechanism installed in the water meter for transmission, and the output gear is meshed with the gear of the counter for transmission. While ensuring normal transmission, it ensures that the movement is firmly positioned in the shell. Under the above premise, the movement positioning structure of the volumetric water meter is achieved by setting two side-facing limit plates on the inner edge of the shell, and installing two limit blocks in the shell at the same time. The two limit plates One side of the limit block is in contact with the side wall of the movement facing away from the counter, and the other side is a limit bevel in the form of an inclined plane. The limit bevels of the two limit blocks and the two limit plates are in contact with one side of the movement. In addition, an elastic member is installed between the two limit blocks so that the elastic member acts between the opposite sides of the two limit blocks. Under the elastic action of the elastic member, the two limit blocks can continuously move away from each other until the limit bevels of the two limit blocks and the side walls of the two limit plates are tightly pressed against each other. In this state, the two limit blocks are firmly limited between the movement and the two limit plates, ensuring that the movement is effectively positioned to prevent it from shaking between the counter and the two limit plates. This allows the movement to always remain in its current position while avoiding the situation where the gears are aggravated by wear, thereby effectively improving the service life of the water meter.

[0010] In the movement positioning structure of the volumetric water meter, each of the limiting inclined surfaces is inclined from the opposite end of the two limiting blocks to the opposite end of the two limiting blocks toward the movement direction, and the two limiting plates are inclined toward the end of the movement and fit with the limiting inclined surfaces of the two limiting blocks. Thus, by means of the matching of the inclined surfaces, the effective limiting of the two limiting blocks by the two limiting plates is ensured, while the contact area between the limiting inclined surfaces and the limiting plates is increased, so that the friction force on the two limiting blocks is greater, and the impact of the fluid on the limiting blocks is reduced.

[0011] In the movement positioning structure of the volumetric water meter, the limiting inclined surfaces of the two limiting blocks are provided with protrusions, and under the elastic action of the elastic member, the two protrusions abut against the opposite sides of the two limiting plates. By setting the protrusions, when the two limiting blocks are pushed outward by the elastic member, the two protrusions can finally abut against the two limiting plates, thereby preventing the limiting inclined surfaces from slipping off the end faces of the limiting plates.

[0012] In the movement positioning structure of the above-mentioned volumetric water meter, the positioning structure also includes a positioning plate, which is detachably connected to the movement by fasteners, and the positioning plate is embedded and limited between the two limit blocks. During the operation of the water meter, the fluid tends to vortex as a whole during the flow process. In addition to the force acting toward the counter or the two limit blocks, the movement will still be subject to components of force in other directions. At this time, one of the two limit blocks will move toward the other limit block. At this time, the moving limit block cannot ensure that the limit bevel and the end face of the limit plate fit. The present application sets the positioning plate so that the two ends of its own structure abut against the opposite side of the two limit blocks, thereby limiting the relative movement of the two limit blocks and ensuring that the limit bevels of the two limit blocks can always abut against the end faces of the two limit plates, so that the movement is firmly limited between the counter and the two limit blocks. Secondly, since the positioning plate is detachably connected to the movement by fasteners, when the movement is subjected to component forces in other directions, the two limit blocks are abutted and limited by the limit plates through the protrusions, so that the two limit plates cannot move away from each other. In other words, after the movement transfers the force received to the two limit blocks through the positioning plate, the two limit plates abut and cooperate with the two limit plates through the two protrusions, so that the two limit plates offset the component forces received in other directions and prevent shaking in other directions, ensuring that the movement can always maintain its current position while avoiding the situation of increased wear of the gears, effectively improving the service life of the water meter and ensuring that the volume of the shell will not be affected by the presence of the filler.

[0013] In the movement positioning structure of the above-mentioned volumetric water meter, the positioning plate includes a rectangular abutment portion embedded between the two limit blocks, and the opposite side of the two limit blocks is a guiding slope, and each of the guiding slopes is inclined inward from one end close to the movement to one end close to the limit plate, and the two ends of the abutment portion are in the shape of slopes and fit and press against the guiding slopes of the two limit blocks. When installing the positioning plate, due to the existence of the guiding slopes, the assembler can insert the abutment portion of the positioning plate from the two limit blocks toward the side of the movement between the two limit blocks to ensure the convenience of installation of the abutment portion. Secondly, during the operation of the water meter, the pressure on the two ends of the abutment portion is more dispersed by cooperating with the slopes, effectively preventing the two ends of the abutment portion from being damaged due to overload.

[0014] In the movement positioning structure of the volumetric water meter, the upper edge of the plate surface of the abutting part facing the elastic member has a limiting edge in the circumferential direction, and the two ends of the limiting edge are in contact with and tightly abut against the guiding inclined surfaces of the two limiting blocks. This makes the thickness of the abutting part thicker, effectively ensuring the structural strength of the abutting part, and further increases the contact area between the two ends of the abutting part and the two limiting blocks, ensuring that the forces on the two ends of the abutting part are more dispersed.

[0015] In the movement positioning structure of the above-mentioned volumetric water meter, the positioning plate also includes a connecting portion formed on the side of the abutting portion facing the movement, the connecting portion is L-shaped and has a waist-shaped hole near the corner, and the fastener passes through the waist-shaped hole and is screwed with the movement to clamp the connecting portion. The waist-shaped hole design makes the installation and positioning of the positioning plate not restricted by the corresponding conditions of the hole position, ensuring that the abutting portion can be fully limited between the two limit blocks, and the connecting portion is specifically arranged on one side of the abutting portion, so that the connection strength between the connecting portion and the abutting portion is maximized, ensuring the overall structural strength of the positioning plate.

[0016] In the movement positioning structure of the volumetric water meter, one of the limit blocks has a limit rod, and the other limit block has a limit hole, the limit rod is inserted into the limit hole, and the elastic member is a spring, which is sleeved outside the limit rod and the circumferential inner wall of the elastic member is in contact with the circumferential outer wall of the limit rod. Through the plug-in cooperation between the limit rod and the limit hole, one of the limit blocks can be correctly guided when sliding relative to the other limit block, and the elastic force of the elastic member always acts on the two limit blocks along the circumference of the limit rod. When assembling, under the premise that the two limit blocks are limited on both sides, the worker only needs to pinch the two limit blocks, and when the elastic member is compressed, the two protrusions are located between the two limit plates, and the two limit blocks are released when the insertion depth is appropriate, and the two limit blocks are pushed outward under the elastic action of the elastic member, and finally the protrusions of the two limit blocks are against the two limit plates.

[0017] In the movement positioning structure of the volumetric water meter, the outer wall of the limit rod is provided with a limit groove along the circumferential direction, each of the limit grooves is arranged through the outer walls at both ends of the limit rod, and the inner wall of the limit hole is provided with a protruding limit portion along the circumferential direction, each of the limit portions extends to the edges at both ends of the limit hole, and each of the limit portions is embedded and limited in each of the limit grooves. Through this arrangement, the limit block provided with the limit hole is prevented from rotating along the circumferential direction of the limit rod during the sliding process, ensuring labor-saving installation.

[0018] In the movement positioning structure of the volumetric water meter, the guiding inclined surfaces of the two limit blocks are provided with positioning grooves, and the two ends of the elastic member extend into the two positioning grooves and abut against the bottom walls of the two positioning grooves, thereby positioning the two ends of the elastic member and preventing the elastic force direction of the elastic member from deviating during the compression and extension process.

[0019] Compared with the prior art, the movement positioning structure of the volumetric water meter has the following advantages:

[0020] 1. Under the action of the elastic member, the two limit blocks are pushed outward, so that one side of the two limit blocks is against the movement, and the other side is against the limit bevel and the limit plate. Under the elastic force of the elastic member, the limit bevel and the limit plate are against each other, and then the movement is tightened by the limit blocks to prevent shaking in other directions. This allows the movement to always remain in the current position while avoiding the situation of increased wear of the gears, effectively improving the service life of the water meter.

[0021] 2. The positioning plate limits the two limit blocks, and the two limit blocks limit the positioning plate, so as to ensure higher stability of the movement and effectively improve the service life of the water meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the movement positioning structure of the volumetric water meter.

[0023] Figure 2 It is a front view of the movement positioning structure of the volumetric water meter.

[0024] Figure 3 yes Figure 2 The sectional view cut along the AA direction and its local enlarged view.

[0025] Figure 4 It is a side view of the movement positioning structure of the volumetric water meter.

[0026] Figure 5 yes Figure 4 Cross-sectional view taken along direction BB.

[0027] Figure 6 It is a bottom view of the movement positioning structure of the volumetric water meter.

[0028] Figure 7 This is an exploded view of the two limit blocks and the elastic parts.

[0029] Figure 8 It is a structural diagram of one of the limit blocks.

[0030] Fig. 9 It is a schematic diagram of the structure of another limit block.

[0031] Fig.10 It is a structural schematic diagram of the positioning plate.

[0032] Fig.11 It is a structural diagram of the positioning plate from another perspective.

[0033] Fig.12 It is a schematic diagram of the structure of the shell.

[0034] In the figure, 1. housing; 11. counter; 12. movement; 13. limit plate; 2. limit block; 21. protrusion; 22. limit rod; 221. limit groove; 23. limit hole; 231. limit part; 24. positioning groove; 25. limit slope; 26. guide slope; 3. positioning plate; 31. abutment part; 311. limit edge; 32. connecting part; 321. waist-shaped hole; 4. elastic member. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0036] like Figure 1 , Figure 2 , Figure 4 , Figure 6 as well as Fig.12As shown, in the movement positioning structure of the volumetric water meter, the volumetric water meter includes a shell 1. Specifically, the shell 1 includes an upper shell and a lower shell, which are locked and fixed by screw connection. It is installed in a pipeline system, with the opening on the lower shell as a water inlet, and the opening on the upper shell as a water outlet. A metering mechanism is installed in the lower shell, which is a prior art. In simple terms, the metering mechanism can be understood as an impeller. A counter 11 and a movement 12 are installed in the upper shell. The counter 11 and the movement 12 are also prior art. In simple terms, they are both gear trains formed by meshing connection of a number of gears. A strip opening is opened on the side wall of the upper shell, and the character wheel part of the counter 11 is embedded in the strip opening. The gap between the two is later Sealing treatment, the specific structure of the movement 12 has been described in the background technology of this case for the gear system part, and will not be repeated in this embodiment, but it should be noted that the counter 11, the movement 12 and the metering mechanism are transmission connected. This part of the structure has been disclosed in Chinese patent CN202158881U, that is, the input gear of the movement 12 is transmission connected to the metering mechanism through the fork rod, the fork head and other components, and the output gear of the movement 12 is meshed with the input gear of the counter 11. When the fluid flows, the metering mechanism is driven and drives the movement 12 to operate, and the movement 12 transmits mechanical energy to the counter 11, so that the counter 11 feeds back the actual water consumption to the user in the form of numbers on the character wheel.

[0037] One side of the movement 12 is against the counter 11, and the other side of the movement 12 in the housing 1 has two limit plates 13 arranged opposite to each other. Figure 7-10 The positioning structure includes two limit blocks 2, which are located between the two limit plates 13 and the movement 12. The side of each limit block 2 facing the movement 12 is in contact with the outer wall of the movement 12, and the side facing away from the movement 12 is a limit slope 25. Specifically, each limit slope 25 is inclined toward the movement 12 from the opposite end of the two limit blocks 2 to the opposite end of the two limit blocks 2. A protruding portion 21 is protruded on the limit slope 25 of each limit block 2, and the two protruding portions 21 are located between the two limit plates 13. A limit rod 22 is integrally formed on one of the limit blocks 2, and a limit hole 23 is provided on the other limit block 2, and the limit rod 22 is penetrated into the limit hole 23.

[0038] It is worth mentioning that a plurality of limit grooves 221 are arranged at intervals along the circumferential direction on the outer wall of the limit rod 22 and the inner bottom wall is planar, and each limit groove 221 extends along the length direction of the limit rod 22 to the edges of its two ends, and a limit portion 231 is arranged at intervals along the circumferential direction on the inner wall of the limit hole 23 and the outer wall is planar, and each limit portion 231 is embedded in each limit groove 221 one by one, and the outer wall is in contact with the inner bottom wall of the limit groove 221. A positioning groove 24 is provided on the opposite side of the two limit blocks 2, and the positioning structure also includes an elastic member 4, which is specifically a spring. The elastic member 4 is sleeved on the outside of the limit rod 22 and the inner wall is in contact with the outer wall of the limit rod 22. Its two ends extend into the two positioning grooves 24 and are tightly pressed against the bottom walls of the positioning grooves 24. Under the action of the elastic force, the two limit blocks 2 can move away from each other along the length direction of the limit rod 22 until the two protrusions 21 are tightly pressed against the two limit plates 13. In addition, the elastic member 4 can also be an elastic sleeve made of elastic rubber material, but because its elastic effect is not as good as that of a spring, and the deformation direction is not controlled during the elastic deformation process, the use of a spring as the elastic member 4 is currently the mainstream means.

[0039] When installing the two limit blocks 2, the worker only needs to pinch the two limit blocks 2. When the elastic member 4 is in a compressed state, the spacing between the two protrusions 21 is smaller than the spacing between the two limit plates 13. At this time, the worker inserts the two limit blocks 2 into the shell 1 while ensuring that one side of each limit block 2 is in contact with the movement 12. After properly adjusting the position, the two limit blocks 2 can be released. At this time, the elastic member 4 elastically stretches and resets, which can push the two limit blocks 2 so that the limiting inclined surfaces 25 on the two limit blocks 2 and the two limit plates 13 are in close contact with each other, and the two protrusions 21 are in close contact with the two limit plates 13. It is worth mentioning that in the above-mentioned installation process, due to the snap-fit ​​cooperation between the limit portion 231 and the limit groove 221, the two limit blocks 2 can be effectively prevented from rotating along the circumferential direction of the limit rod 22 during the installation process (before being embedded in the shell 1), thereby reducing the difficulty of installation.

[0040] Combination Fig.11 The positioning structure also includes a positioning plate 3, which is specifically formed by a rectangular abutment portion 31 and an L-shaped connecting portion 32. The abutment portion 31 is embedded between the two limiting plates 13 and is located above the limiting rod 22 and the elastic member 4. A limiting edge 311 is provided on the upper edge of the plate surface on the side facing the limiting rod 22 in the circumferential direction, and its two ends abut against the two limiting blocks 2. Secondly, the connecting portion 32 is specifically formed on the side of the abutment portion 31 facing the movement 12, and a waist-shaped hole 321 is provided on the plate surface near the corner along the length direction of the limiting rod 22, and the connecting portion 32 passes through the waist-shaped hole 321 through a fastener (i.e., a screw) and is screwed and locked with the movement 12.

[0041] The advantage of such a structure is that when the fluid is in a flowing state, the fluid in a vortex flow state will exert a force on the movement 12 and the counter 11. Since the counter 11 is fixedly connected to the housing 1, the thrust will not have too much impact on it. However, the movement 12 is positioned only by the combination of the input gear and the output gear. Although one side of the movement is against the counter 11, the position retention effect that can be achieved is extremely limited. In this case, the positioning plate 3, the two limit blocks 2, the elastic member 4 and the two limit blocks 3 are used to prevent the movement 12 from being locked. With the cooperation of the limit plate 13, the force exerted on the movement 12 is transmitted by the positioning plate 3. The two limit blocks 2 are limited outward by the cooperation of the protrusion 21 and the two limit plates 13, and the two limit blocks 2 are limited inward by the abutment 31 of the positioning plate 3. With the assistance of the elastic force of the elastic member 4, the positioning structure completely unloads the force exerted on the movement 12 in all directions, so that the movement 12 can be stably maintained in this position and the wear on the input gear and the output gear is reduced.

[0042] In addition, it is worth mentioning that Figure 5 As shown, the opposite side of the two limit blocks 2 is a guiding slope 26, and the positioning groove 24 is opened on the guiding slope 26. Each guiding slope 26 is inclined inward from the end close to the movement 12 to the end close to the limit plate 13, and the two ends of the abutment part 31 are also inclined. When installing the positioning plate 3, the guiding slope 26 guides the two ends of the abutment part 31, thereby ensuring the convenience of installation of the positioning plate 3. Secondly, it can also ensure that the contact area between the two ends of the abutment part 31 and the two limit blocks 2 is larger, thereby ensuring the installation stability of the abutment part 31.

[0043] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0044] Although this article uses more terms such as housing 1, counter 11, movement 12, limit plate 13, limit block 2, protrusion 21, limit rod 22, limit groove 221, limit hole 23, limit part 231, positioning groove 24, limit slope 25, guide slope 26, positioning plate 3, abutment part 31, limit edge 311, connecting part 32, waist hole 321, elastic member 4, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A movement positioning structure for a volumetric water meter, the volumetric water meter comprising a housing (1) in which a counter (11) is fixedly arranged, the movement (12) being detachably connected to the housing (1) and having one side abutting against the counter (11), characterized in that: The housing (1) has two limit plates (13) with opposite sides in the radial direction. The positioning structure comprises two limit blocks (2) and an elastic member (4) which are detachably connected to the housing (1). One side of the two limit blocks (2) abuts against the other side of the movement (12). The other side of the two limit blocks (2) has a limit inclined surface (25) abutting against the two limit plates (13). The elastic member (4) elastically acts between the two limit blocks (2). Under the elastic action of the elastic member (4), the two limit blocks (2) can move away from each other and make the limit inclined surface (25) abut against the limit plate (13).

2. The movement positioning structure of the volumetric water meter according to claim 1, characterized in that: Each of the limiting inclined surfaces (25) is inclined from an opposite end of the two limiting blocks (2) to an opposite end of the two limiting blocks (2) in the direction of the movement (12), and one end of the two limiting plates (13) facing the movement (12) is in an inclined shape and fits with the limiting inclined surfaces (25) of the two limiting blocks (2).

3. The movement positioning structure of the volumetric water meter according to claim 2, characterized in that: The limiting inclined surfaces (25) of the two limiting blocks (2) are each provided with a protrusion (21), and under the elastic action of the elastic member (4), the two protrusions (21) abut against opposite sides of the two limiting plates (13).

4. The movement positioning structure of the volumetric water meter according to claim 1, 2 or 3, characterized in that: The positioning structure also includes a positioning plate (3), the positioning plate (3) being detachably connected to the movement (12) via a fastener, and the positioning plate (3) being embedded in and limited between the two limit blocks (2).

5. The movement positioning structure of the volumetric water meter according to claim 4, characterized in that: The positioning plate (3) comprises a rectangular abutting portion (31) embedded between the two limit blocks (2); the opposite side of the two limit blocks (2) is a guiding inclined surface (26); each guiding inclined surface (26) is inclined inwardly from an end close to the movement (12) to an end close to the limit plate (13); both ends of the abutting portion (31) are inclined and fit and press against the guiding inclined surfaces (26) of the two limit blocks (2).

6. The movement positioning structure of the volumetric water meter according to claim 5, characterized in that: The upper edge of the plate surface of one side of the abutting portion (31) facing the elastic member (4) has a limiting edge (311) in the circumferential direction, and the two ends of the limiting edge (311) are in contact with and tightly abut against the guiding inclined surfaces (26) of the two limiting blocks (2).

7. The movement positioning structure of the volumetric water meter according to claim 5, characterized in that: The positioning plate (3) further comprises a connecting portion (32) formed on a side of the abutting portion (31) facing the movement (12); the connecting portion (32) is L-shaped and has a waist-shaped hole (321) near a corner; the fastener passes through the waist-shaped hole (321) and is screwed to the movement (12) so that the connecting portion (32) is clamped.

8. The movement positioning structure of a volumetric water meter according to claim 1, 2 or 3, characterized in that: One of the limit blocks (2) has a limit rod (22), and the other limit block (2) has a limit hole (23), the limit rod (22) is inserted into the limit hole (23), and the elastic member (4) is a spring, and the elastic member (4) is sleeved outside the limit rod (22) and the circumferential inner wall of the elastic member (4) is in contact with the circumferential outer wall of the limit rod (22).

9. The movement positioning structure of the volumetric water meter according to claim 8, characterized in that: The outer wall of the limiting rod (22) is provided with a limiting groove (221) along the circumferential direction, and each of the limiting grooves (221) is arranged to penetrate the outer walls at both ends of the limiting rod (22). The inner wall of the limiting hole (23) is provided with a protruding limiting portion (231) along the circumferential direction, and each of the limiting portions (231) extends to the edges of both ends of the limiting hole (23), and each of the limiting portions (231) is embedded in and limited in each of the limiting grooves (221).

10. The movement positioning structure of the volumetric water meter according to claim 9, characterized in that: The guiding inclined surfaces (26) of the two limit blocks (2) are provided with positioning grooves (24), and the two ends of the elastic member (4) extend into the two positioning grooves (24) and are tightly pressed against the bottom walls of the two positioning grooves (24).

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