Anti-burst water meter

Abstract

The application discloses a kind of anti-burst water meters, including meter shell, metering device and expansion block;Metering device is arranged in meter shell and is used to measure water flow;Expansion block is fixedly arranged in meter shell, can be compressed under the expansion pressure of water freezing and can automatically recover after the expansion pressure is removed.The application can reduce the volume of water remaining in the meter shell by setting expansion block in the meter shell, and when water freezes and expands in volume, the expansion block is compressed and shrunk to reduce the occupation of the volume in the meter shell, and then space is released for water expansion, reducing the extrusion of the metering device and the meter shell when water expands, thereby preventing the anti-burst water meter from bursting.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water meters, in particular to a water meter capable of preventing explosion. BACKGROUND

[0002] A water meter is an instrument for measuring water flow, mostly cumulative water flow measurement; a water meter for recording water consumption of tap water is installed on a water pipe, when a user releases water, water flows into the housing of the water meter, and the metering device in the housing measures the water flow.

[0003] The existing water meter is not protected by any anti-freezing measures, when extreme low temperature weather strikes, the water medium in the water meter becomes ice medium, the pipe at both ends is sealed by ice, the water in the water meter turns into ice and expands, the expansion pressure is rapidly transmitted to the housing and the components of the metering device immersed in water, thereby causing the water meter to explode. This damage to the water meter not only makes the water meter itself unable to work, but also affects the effective management of water resources by the water supply department, and damages the interests of the state; frequently replacing the water meter or configuring additional anti-freezing devices for the water meter not only has high cost, but also wastes a lot of manpower and material resources; therefore, there is an urgent need for an effective anti-freezing water meter on the market. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a water meter capable of preventing explosion caused by water freezing.

[0005] The purpose of the present application is achieved by adopting the following technical solutions:

[0006] A water meter capable of preventing explosion, comprising:

[0007] a housing;

[0008] a metering device arranged in the housing and used for measuring water flow;

[0009] an expansion block fixedly arranged in the housing, capable of being compressed under the expansion pressure of water freezing and automatically restored after the expansion pressure is removed.

[0010] Further, the expansion block is an EVA block.

[0011] Further, the metering device comprises an impeller, an impeller shaft, an impeller box, a box body, a gear transmission mechanism and an indicating element; the impeller is rotatably arranged in the impeller box; the indicating element is arranged in the box body and comprises at least one of an indicating needle and a dial; the impeller is further in transmission connection with the indicating element through the gear transmission mechanism, so as to drive the indicating element to rotate through the gear transmission mechanism when the impeller rotates.

[0012] Further, a filter screen is arranged in the surface shell and covers the impeller box.

[0013] Further, the expansion block is arranged between the bottom surface of the filter screen and the surface shell and is used to provide elastic stress to push the top end of the filter screen against the surface shell.

[0014] Further, the expansion block covers the bottom surface of the filter screen, and the bottom surface of the filter screen is opposite to the bottom surface of the impeller box; the expansion block can prevent water from flowing through it to the bottom surface of the filter screen.

[0015] Further, the bottom surface of the filter screen extends downward to form a ring-shaped surrounding plate, the expansion block is arranged in the ring-shaped surrounding plate and tightly matches with the ring-shaped surrounding plate, and the expansion block extends below the ring-shaped surrounding plate.

[0016] Further, the filter screen has a plurality of water passing holes which communicate the inside of the filter screen with the inside of the surface shell; the inner diameter of the water passing holes gradually increases from one end close to the impeller box to the other end.

[0017] Further, the surface shell comprises a shell body and a shell cover threadedly connected with the shell body; the box body is arranged directly below the shell cover; the metering device further comprises a first mounting plate, a second mounting plate and a support; the first mounting plate and the second mounting plate are arranged in the box body in an up-down spaced manner and are fixedly connected with each other; the gear transmission mechanism is arranged between the first mounting plate and the second mounting plate; the support is close to the center of the first mounting plate, and the two ends of the support are respectively opposite to the faces of the first mounting plate and the second mounting plate which face each other.

[0018] Further, a sealing ring is arranged between the surface shell and the part of the box body which protrudes from the first mounting plate.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] By arranging the expansion block in the surface shell, the present application can reduce the volume of water stored in the surface shell, and when the water is frozen and expanded, the expansion block is compressed under the expansion pressure to reduce the occupation of the volume in the surface shell, thereby providing space for water expansion, reducing the extrusion of the metering device and the surface shell when the water expands, and preventing the anti-burst water meter from bursting. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 Fig. 1 is a structural schematic diagram of the anti-burst water meter of the present application;

[0022] Fig. 2 A sectional view of the anti-burst water meter of the present application;

[0023] Fig. 3 An assembled view of the first mounting plate, the second mounting plate, the support, the gear transmission mechanism and the indicating element of the present application;

[0024] Fig. 4 A split structure schematic view of the water filter net and the expansion block of the present application.

[0025] In the figure: 10, meter shell; 11, shell body; 12, shell cover; 20, metering device; 21, impeller; 22, impeller box; 23, box body; 24, gear transmission mechanism; 25, indicating element; 251, indicating needle; 252, dial; 26, first mounting plate; 27, second mounting plate; 28, support; 30, expansion block; 40, water filter net; 41, water passage hole; 50, annular fence; 60, sealing ring; 70, flat plate; 80, mounting column; 90, worm gear mechanism. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connection” and “linking” should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] Please refer to Figs. 1 to 4The application discloses a kind of anti-burst water meters, including shell 10, metering device 20 and expansion block 30;Metering device 20 is arranged in shell 10 and is used to measure water flow;Expansion block 30 is fixedly arranged in shell 10, can be compressed under the expansion pressure of water freezing and can automatically recover after the expansion pressure is removed;At this time, expansion block 30 occupies the space in shell 10, reduce the volume of water remaining in shell 10, and when water is frozen and expands in ice, expansion block 30 is compressed and shrinks under the expansion pressure and reduces the occupation of volume in shell 10, in turn, space for water expansion, reduce the extrusion of metering device 20 and shell 10 when water expands, to prevent the anti-burst water meter from bursting;At the same time, after water melting and other situations contact expansion pressure, expansion block 30 automatically recovers and occupies the volume in shell 10 to continuously prevent the anti-burst water meter from bursting.

[0029] The expansion block 30 of the embodiment is an EVA block, which can be directly purchased from the market, saving R&D costs;The EVA block has good resilience and toughness to recover well.

[0030] The metering device 20 of the embodiment includes an impeller 21, an impeller 21 shaft, an impeller box 22, a box body 23, a gear transmission mechanism 24 and an indicating element 25;The impeller 21 is rotatably arranged in the impeller box 22;The indicating element 25 is arranged in the box body 23 and includes at least one of an indicating needle 251 and a dial 252;The impeller 21 is also in transmission connection with the indicating element 25 through the gear transmission mechanism 24, so that it can drive the indicating element 25 to rotate through the gear transmission mechanism 24 when it rotates. In this way, when using, water enters through the shell 10 and impacts the impeller 21, which rotates to drive the indicating element 25 to rotate through the gear transmission mechanism 24, thereby realizing water quantity measurement, and then water flows out through the shell 10.

[0031] It can be understood that when the gear transmission mechanism 24 transmits the rotation of the external impeller 21 to the indicating needle 251 and / or the dial 252, the indicating needle 251 and / or the dial 252 rotate to realize water consumption counting, and the realization principle can be known from the prior art, which will not be described here. Specifically, the shell 10 has a transparent plate, and the indicating element 25 is opposite to the transparent plate, so that the water consumption can be viewed through the transparent plate.

[0032] Specifically, the gear transmission mechanism 24 of the embodiment is in transmission connection with the dial 252 through a worm and gear mechanism 90.

[0033] Since the outside water may have impurities and affect the rotation of the impeller 21, a filter screen 40 is arranged in the watchcase 10 and covers the impeller box 22, so that the water filtered by the filter screen 40 enters the impeller box 22 to impact the impeller 21, avoiding the influence of the impurities in the water on the rotation of the impeller 21, and ensuring the performance stability of the water meter.

[0034] The expansion block 30 of the embodiment is arranged between the bottom surface of the filter screen 40 and the watchcase 10, and is used to provide an elastic stress for urging the top end of the filter screen 40 to abut against the watchcase 10, so that the dual functions of the expansion block 30 are realized to simplify the structure.

[0035] It is worth mentioning that when the expansion block 30 is an EVA block, the EVA block has shock absorption characteristics, can well buffer and resist the shock of the filter screen, reduce the possibility of water flow oscillation caused by the instability of the internal water pressure of the external pipeline and the air in the external pipeline, and avoid causing the self-rotation of the impeller 21 installed in the filter screen and the self-moving phenomenon of the water meter.

[0036] The bottom surface of the filter screen 40 of the embodiment extends downward to form a ring-shaped surrounding plate 50, and the expansion block 30 is arranged in the ring-shaped surrounding plate 50 and tightly matches with the ring-shaped surrounding plate 50 to realize the fixation of the expansion block 30; specifically, the expansion block 30 extends below the ring-shaped surrounding plate 50 to be able to contact with water and receive the expansion pressure when the water freezes and then be compressed.

[0037] The filter screen 40 of the embodiment has a plurality of water passing holes 41 for connecting the inside of the filter screen 40 with the inside of the watchcase 10; the inner diameter of the water passing hole 41 gradually increases from one end close to the impeller box 22 to the other end; in this way, when the water flows into the watchcase 10, the water flow impacts on the filter screen 40 and then enters the filter screen 40 through the water passing hole 41, at this time, the water passing hole 41 has a good rectification effect on the water flow; specifically, the hole wall of the water passing hole 41 guides the water flow to concentrate the water flow in one direction, so that the water flow is stabilized, the turbulence is avoided, and the stable metering performance of the water meter is ensured.

[0038] It is worth mentioning that the water passing hole 41 can reduce the kinetic energy loss of the water flow, can bring greater driving force, and improve the metering accuracy of the water meter.

[0039] Specifically, the axial section of the water passing hole 41 of the embodiment is trapezoidal.

[0040] The expansion block 30 of the embodiment closes the bottom surface of the filter screen 40, and the bottom surface of the filter screen 40 is opposite to the bottom surface of the impeller box 22. The expansion block 30 can prevent the water flow from flowing to the bottom surface of the filter screen 40. In this way, the water flow cannot enter through the bottom surface of the filter screen 40 without impacting the bottom surface of the impeller box 22, thereby reducing the disturbance caused by the water flow impacting the bottom surface of the impeller box 22, and further reducing the influence on the impeller 21.

[0041] The watch case 10 of the embodiment comprises a case 11 and a case cover 12. The case cover 12 is threadedly connected with the case 11. The meter device 20 further comprises a first mounting plate 26 and a second mounting plate 27. The box body 23 is arranged directly below the case cover 12. The first mounting plate 26 and the second mounting plate 27 are arranged in the box body 23 in a spaced-apart manner and are fixedly connected with each other. The gear transmission mechanism 24 is arranged between the first mounting plate 26 and the second mounting plate 27. At this time, the first mounting plate 26 and the second mounting plate 27 cooperate to protect the gear transmission mechanism 24. However, during the process of screwing the case cover 12 on the case 11, the case cover 12 is easily deformed downward by pressing the middle part of the first mounting plate 26 downward, the space between the first mounting plate 26 and the second mounting plate 27 becomes smaller, and the gear transmission mechanism 24 has too small a play, which causes the performance of the water meter to change. In severe cases, the water meter may even stop running at a small flow rate due to the excessive friction resistance of the gear transmission mechanism 24.

[0042] From the above, the meter device 20 of the embodiment further comprises a support 28. The support 28 is close to the center of the first mounting plate 26, and the two ends of the support 28 are respectively in contact with the surfaces of the first mounting plate 26 and the second mounting plate 27 that face each other. In this way, when the first mounting plate 26 is pressed during the assembly of the water meter, the support 28 supports the middle part of the first mounting plate 26, thereby preventing the first mounting plate 26 from being deformed downward. The space between the first mounting plate 26 and the second mounting plate 27 can be prevented from becoming smaller, the gear transmission mechanism 24 can have sufficient play, and the performance of the water meter can be maintained stable.

[0043] Specifically, the support 28 is fixed on the first mounting plate 26 or the second mounting plate 27 to prevent the support 28 from being lost.

[0044] The cross section of the support column of the embodiment is in the shape of a cross, and the support is more stable.

[0045] It is worth mentioning that the gear transmission mechanism 24 comprises a gear and a rotating shaft fixed with the gear. The rotating shaft is mounted on the first mounting plate 26 and the second mounting plate 27. The water meter further comprises a flat plate 70 arranged between the second mounting plate 27 and the bottom surface of the box body 23. At this time, since the rotating shaft extends below the second mounting plate 27, the bottom surface of the box body 23 is not a plane. At this time, the flat plate 70 supports the rotating shaft.

[0046] The top end of the box body 23 of the embodiment protrudes upwardly from the top surface of the first mounting plate 26; thus, when the shell cover 12 is screwed, the shell cover 12 abuts against the top surface of the box body 23, which reduces the possibility of the shell cover 12 abutting against the first mounting plate 26, and reduces the pressure of the downward pressing of the first mounting plate 26 during screwing.

[0047] The embodiment also comprises a sealing ring 60, which is arranged between the watch case 10 and the part of the box body 23 protruding from the first mounting plate 26; the sealing ring 60 can prevent the water entering the watch case 10 from flowing into the box body 23; furthermore, the box body 23 separates the sealing ring 60 from the first mounting plate 26, which prevents the sealing ring 60 from deforming the first mounting plate 26 by pressing it; meanwhile, the position of the sealing ring 60 is arranged such that the sealing ring 60 will be pressed during the screwing of the shell cover 12, which improves the sealing performance of the sealing ring 60.

[0048] The embodiment also comprises mounting columns 80, which are connected to the outer sides of the first mounting plate 26 and the second mounting plate 27 respectively, so as to fixedly connect the first mounting plate 26 and the second mounting plate 27; the mounting columns 80 are arranged outside the first mounting plate 26 and the second mounting plate 27, which avoids interrupting the installation space of the gear transmission mechanism 24.

[0049] The above-mentioned embodiments are only the preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application; any non-essential changes and replacements made by the person skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. A blowout-proof water meter, characterized by, The utility model relates to a water meter, comprising: a watch case; a metering device arranged in the watch case and used for measuring water flow; the metering device comprises an impeller, an impeller shaft, an impeller box, a box body, a gear transmission mechanism and an indicating element; an expansion block fixedly arranged in the watch case, capable of being compressed under the expansion pressure of water freezing and automatically restored after the expansion pressure is removed; a water filter screen arranged in the watch case and enclosed outside the impeller box; the expansion block is arranged between the bottom surface of the water filter screen and the watch case and used for providing elastic stress for urging the top end of the water filter screen to abut against the watch case; the expansion block encloses the bottom surface of the water filter screen, and the bottom surface of the water filter screen faces the bottom surface of the impeller box; the expansion block can prevent water flow from passing therethrough to the bottom surface of the water filter screen.

2. The explosion-proof water meter of claim 1, wherein The expansion block is an EVA block.

3. The explosion-proof water meter of claim 1, wherein, The impeller is rotatably arranged in the impeller box; the indicating element is arranged in the box body and comprises at least one of an indicating needle and a dial; the impeller is further drivingly connected with the indicating element through the gear transmission mechanism, so that the indicating element can be rotated by the gear transmission mechanism when the impeller rotates.

4. The explosion-proof water meter of claim 1, wherein The bottom surface of the water filter screen downwardly extends to form a ring-shaped surrounding plate, the expansion block is built in the ring-shaped surrounding plate and tightly matches with the ring-shaped surrounding plate, and the expansion block extends below the ring-shaped surrounding plate.

5. The explosion-proof water meter of claim 1, wherein The water filter screen has a plurality of water passing holes for communicating the inside of the water filter screen with the inside of the watch case; the inner diameter of the water passing holes gradually increases from one end close to the impeller box to the other end.

6. The explosion-proof water meter of claim 3 wherein, The watch case comprises a case body and a case cover threadedly connected with the case body; the box body is arranged directly below the case cover; the metering device further comprises a first mounting plate, a second mounting plate and a support; the first mounting plate and the second mounting plate are arranged in the box body in an up-down spaced manner and are fixedly connected with each other; the gear transmission mechanism is arranged between the first mounting plate and the second mounting plate; the support is close to the center of the first mounting plate, and the two ends of the support respectively correspond to the surfaces of the first mounting plate and the second mounting plate facing each other.

7. The explosion-proof water meter of claim 6 wherein, A sealing ring is further arranged between the watch case and the part of the box body protruding from the first mounting plate.

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