Water lock structure of water meter

Abstract

The utility model provides a kind of water lock structure of water meter, belong to water meter technical field.It solves how to ensure the problem of the measurement accuracy of water meter.The water lock structure of this water meter, water meter includes the shell with cavity inside and impeller, the shell is fixed with cover plate, and the plate face center of the cover plate is equipped with through shaft hole, the cover plate separates the cavity into water delivery cavity and the installation cavity for installing counter and gear set, and the installation cavity is located above the water delivery cavity, the impeller is rotatably connected in water delivery cavity, water lock structure includes the connecting shaft fixed in the top of the impeller and the upper protruding part shaped on the upper side plate face of the cover plate, the through shaft hole is set through the upper protruding part, the connecting shaft is inserted into the installation cavity by through shaft hole, and the connecting shaft outer wall and the through shaft hole inner wall are close to each other.The water lock structure of this water meter can ensure the measurement accuracy of water meter.

Description

Technical Field

[0001] This utility model belongs to the field of water meter technology and relates to a water-locking structure for a water meter. Background Technology

[0002] Water meters are very common water metering devices in modern life. Mechanical water meters, as one type of water meter, mainly use water in the pipes as power. The flow of water drives an impeller to rotate, which is then transmitted through a shaft and gear assembly. The gear assembly drives a counter to count water consumption. It's worth noting that to ensure stable installation of the gear assembly and counter, a cover plate is usually installed inside the water meter casing. This cover plate divides the cavity inside the casing into an upper and lower distributed installation cavity and a water delivery cavity. A specific cover plate structure is disclosed in Chinese Patent (Authorization Announcement No.: CN 220437490 U), which includes a plate-shaped body with several snap-fit ​​parts on its outer circumferential surface, each protruding from the outer circumferential surface of the body. A plug-in part is provided circumferentially on the bottom surface of the body, and the circumferential edge of the bottom surface of the body forms an abutment edge with the plug-in part.

[0003] It is worth mentioning that, in order to ensure the accuracy of the measurement, the housing cavity of the water meter (i.e., the installation cavity and the water delivery cavity) must be filled with water to prevent measurement errors caused by different resistance. In addition, when connecting and assembling the impeller and gear assembly, the shaft is arranged by passing through the through hole in the center of the cover plate through the fixed shaft on the impeller.

[0004] However, in reality, the water flowing in the pipes often contains a certain amount of air. This means that after the water enters the water delivery chamber, some air will remain inside. Since the water delivery chamber and the installation chamber are connected through the through holes on the cover, water in the installation chamber will enter the water delivery chamber under the influence of gravity, preventing the installation chamber from being fully filled. In this state, the air in the installation chamber will create air resistance on the internal gear assembly, leading to a deviation in the water meter's measurement. Summary of the Invention

[0005] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a water-locking structure for water meters. The technical problem this utility model aims to solve is: how to ensure the metering accuracy of water meters.

[0006] The objective of this utility model can be achieved through the following technical solution: a water-locking structure for a water meter, the water meter including a housing with an internal cavity and an impeller, a cover plate fixed inside the housing, and a through-shaft hole provided at the center of the cover plate surface, the cover plate dividing the cavity into a water delivery cavity and an installation cavity for installing a counter and a gear set, and the installation cavity being located above the water delivery cavity, the impeller being rotatably connected in the water delivery cavity, characterized in that the water-locking structure includes a connecting shaft fixed to the top of the impeller and an upper protrusion formed on the upper side surface of the cover plate, the through-shaft hole being provided through the upper protrusion, the connecting shaft extending into the installation cavity through the through-shaft hole, and the outer peripheral wall of the connecting shaft and the inner peripheral wall of the through-shaft hole being close to each other.

[0007] In the water-locking structure of this water meter, a cover plate is installed inside the housing, which divides the cavity inside the housing into an upper and lower distributed installation cavity and a water delivery cavity. The installation cavity is used to assemble the gear set and counter. The water delivery cavity is connected to the water inlet and outlet on the housing, and an impeller is rotatably connected in the water delivery cavity. Based on this structure, the difference between this application and the prior art is that an upper protrusion is formed on the upper side plate of the cover plate, and the through-shaft hole is set through the upper protrusion. Under the premise that the rotation speed of the connecting shaft is not affected after installation, the outer peripheral wall of the connecting shaft itself and the inner peripheral wall of the through-shaft hole are set close together. Through this setting, the gap between the connecting shaft and the hole wall of the through-shaft hole is smaller, and the presence of the upper protrusion increases the depth of the gap. The surface tension of water in the installation cavity remains unchanged, thereby isolating the water in the installation cavity from the water in the water delivery cavity, preventing water in the installation cavity from leaking into the water delivery cavity through the through-shaft hole, avoiding air resistance caused by air in the installation cavity, and thus ensuring the metering accuracy of the water meter.

[0008] In the aforementioned water-locking structure of the water meter, the lower side of the cover plate has an annular dividing groove at its center, the top of the impeller extends into the dividing groove, and the upper side of the cover plate has a raised portion at its center, with the upper protrusion formed on the raised portion. The through-shaft hole extends from the bottom wall of the dividing groove to the upper end of the upper protrusion. The dividing groove effectively blocks the water flow acting on the outer wall of the connecting shaft in the radial direction. Since the water in the water delivery chamber flows in a vortex state, this effectively prevents water in the installation cavity from leaking into the water delivery chamber. Furthermore, the raised portion ensures that the through-shaft hole can be opened normally while making the gap formed by the through-shaft hole, the upper protrusion, and the connecting shaft narrower. Combined with the surface tension of water, this prevents water in the installation cavity from leaking into the water delivery chamber, thus ensuring the metering accuracy of the water meter.

[0009] In the water-locking structure of the water meter described above, the height of the upper protrusion is greater than or equal to one-third of the depth of the through-hole.

[0010] In the aforementioned water-locking structure of the water meter, the top of the impeller has a columnar connecting part that extends into the partition groove. A retaining groove is provided on the connecting part, and the connecting shaft is snapped and fixed within the retaining groove. This design ensures that the connecting shaft and the impeller are detachable, resulting in lower maintenance costs. Furthermore, the impeller's extension into the partition groove via the connecting part prevents interference from water flow in the water delivery chamber at the connection point.

[0011] In the water-locking structure of the water meter described above, the height of the lower protrusion is greater than or equal to half the height of the connecting part. This design ensures that the lower protrusion effectively blocks the water flow in the water delivery chamber in the radial direction of the cover plate.

[0012] In the water-locking structure of the water meter described above, the lower side of the cover plate has a downward protrusion at its center, and the dividing groove is formed on the downward protrusion to ensure the stability of the resulting dividing groove structure.

[0013] Compared with existing technologies, the water-locking structure of this water meter has the following advantages:

[0014] By forming an upper protrusion on the upper side of the cover plate, the depth of the through-shaft hole is increased, allowing the connecting shaft to pass through the through-shaft hole and the outer peripheral wall of the connecting shaft to be set close to the inner peripheral wall of the through-shaft hole. The narrow gap formed, combined with the surface tension of the water in the installation cavity, ensures that the water in the installation cavity will not leak into the water delivery cavity, thereby avoiding deviations in the metering accuracy of the gear assembly and counter in the installation cavity due to air resistance. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the water-locking structure of this water meter.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0017] Figure 3 This is a structural diagram of the cover plate.

[0018] Figure 4 This is a structural schematic diagram of the cover plate from another perspective.

[0019] Figure 5 This is a schematic diagram of the impeller structure.

[0020] In the figure, 1 is the shell; 11 is the water delivery chamber; 12 is the mounting chamber; 2 is the cover plate; 21 is the through-shaft hole; 22 is the upper protrusion; 23 is the partition groove; 24 is the raised part; 25 is the lower protrusion; 3 is the impeller; 31 is the connecting shaft; 32 is the connecting part; 321 is the slot. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] like Figure 1 As shown, in the water-locking structure of this water meter, the water meter includes a housing 1, a cover plate 2, and an impeller 3. The housing 1 has a cavity inside, and the cover plate 2 is installed in the housing 1 laterally, so that the cavity inside the housing 1 is divided into an installation cavity 12 and a water delivery cavity 11 arranged vertically. The installation cavity 12 is located above the water delivery cavity 11. The installation cavity 12 is used to install a gear set for measuring the water flow rate and a counter. The housing 1 has an inlet and an outlet, both of which are connected to the water delivery cavity 11. The impeller 3 is rotatably connected in the water delivery cavity 11.

[0023] Combination Figure 2-5 A circular plate-shaped raised portion 24 is formed at the center of the upper side of the cover plate 2. An upper protrusion 22 is formed on the raised portion 24. A lower protrusion 25 is formed at the center of the lower side of the cover plate 2. A partition groove 23 is provided at the bottom of the lower protrusion 25. It is worth mentioning that the upper protrusion 22 and the lower protrusion 25 are coaxially arranged. A through-shaft hole 21 is provided on the raised portion 24. The upper end of the through-shaft hole 21 extends to the top surface of the upper protrusion 22, and the lower end extends to the bottom wall of the partition groove 23. The installation cavity 12 and the water supply cavity 11 are connected through the through-shaft hole 21.

[0024] like Figure 5As shown, the top of the impeller 3 has a columnar connecting part 32, on which a slot 321 is provided. The lower end of the connecting shaft 31 is fixed in the slot 321, and the upper end passes through the partition groove 23 and the shaft hole 21 in sequence and extends into the mounting cavity 12 to connect with the gear set installed in the mounting cavity 12. It is important to emphasize that after the connecting shaft 31 is arranged, the connecting part 32 at the top of the impeller 3 extends into the partition groove 23, and the lower protrusion 25 provides sufficient protection for the connecting shaft 31 that is fixed in the slot 321. On this basis, the outer peripheral wall of the connecting shaft 31 and the inner peripheral wall of the shaft hole 21 are set close together, so that the outer peripheral wall of the connecting shaft 31 and the inner peripheral wall of the shaft hole 21 are closely spaced. A narrow, annular gap is formed, allowing the connecting shaft 31 to be properly positioned. When the impeller 3 rotates and drives the connecting shaft 31 to power the gear set, there is no interference between the outer peripheral wall of the connecting shaft 31 and the inner peripheral wall of the through-shaft hole 21. Under this premise, the mounting cavity 12 itself needs to be filled with water. The close fit between the connecting shaft 31 and the through-shaft hole 21, combined with the surface tension of water, ensures that the water in the mounting cavity 12 remains within the cavity, preventing leakage into the water delivery cavity 11. This avoids air entering the mounting cavity 12 and causing gas resistance that could interfere with the operation of the gear set and counter, thus ensuring the metering accuracy of the water meter. It is worth mentioning that, to fully separate the mounting cavity 12 and the water delivery cavity 11, when installing the cover plate 2, the outer edge of the cover plate 2 and the inner edge of the housing 1 generally need to be leak-proofed. Specifically, in the prior art, a sealing ring is usually installed between the two to seal the gap between the outer edge of the cover plate 2 and the inner peripheral wall of the housing 1.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0026] Although this document frequently uses terms such as shell 1, water delivery cavity 11, mounting cavity 12, cover plate 2, through shaft hole 21, upper protrusion 22, partition groove 23, raised part 24, lower protrusion 25, impeller 3, connecting shaft 31, connecting part 32, and slot 321, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

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