KR20240028237A - Water Meters - Google Patents

Abstract

The present invention relates to a water meter, and more specifically, includes a water meter case having an inflow channel, an outlet channel, and a backflow prevention hole communicating with the outlet channel, and a backflow prevention device for blocking the backflow of fluid in the water meter case. The backflow prevention device includes a valve cover mounted on the water meter case and forming a check space with the outer shell of the water meter, the check space communicating with the outflow channel through the backflow prevention hole, and fixed to the valve cover. It includes a guide sleeve that divides the check space into a first cavity in the valve cover and a second cavity in communication with the outflow channel, and a valve core that extends slidably within the check space, wherein the guide sleeve has both ends of the guide sleeve. A guide slide penetrating, including at least one pressure relief hole surrounding the guide slide and communicating between a first cavity and a second cavity, wherein the valve core slides relative to the valve cover along the guide slide, and the valve It relates to a water meter capable of immediate backflow prevention and improved durability of the backflow prevention device by having the core seal the backflow prevention hole in the sealed position and separate from the backflow prevention hole in the open position.

Description

Water meters

The present invention relates to a water meter, and more specifically, includes a water meter case having an inflow channel, an outlet channel, and a backflow prevention hole communicating with the outlet channel, and a backflow prevention device for blocking the backflow of fluid in the water meter case. The backflow prevention device includes a valve cover mounted on the water meter case and forming a check space with the outer shell of the water meter, the check space communicating with the outflow channel through the backflow prevention hole, and fixed to the valve cover. It includes a guide sleeve that divides the check space into a first cavity in the valve cover and a second cavity in communication with the outflow channel, and a valve core that extends slidably within the check space, wherein the guide sleeve has both ends of the guide sleeve. A guide slide penetrating, including at least one pressure relief hole surrounding the guide slide and communicating between a first cavity and a second cavity, wherein the valve core slides relative to the valve cover along the guide slide, and the valve It relates to a water meter capable of immediate backflow prevention and improved durability of the backflow prevention device by having the core seal the backflow prevention hole in the sealed position and separate from the backflow prevention hole in the open position.

A water meter is a device used to measure the flow of water and generally consists of a water meter case, a measuring unit, a measuring unit cover, and a reader. The measuring unit is installed in the water meter case, and is a measuring device mainly composed of an impeller chamber, impeller, and other parts. A cover for the measuring unit is installed on the water meter case, and the measuring unit is covered to prevent the water measured in the water meter case from leaking to the outside. do. The leader is fixed to the water meter case, and when water flows through the water meter, water flows in from around the impeller chamber, and after the water flow hits the impeller, the impeller begins to rotate.

If the water supply is stopped while the water meter is in use or, conversely, the water meter is installed, the water accumulated in the outlet channel may flow back into the impeller box, affecting the measurement accuracy of the water meter. Therefore, meters in the prior art are generally installed in the outlet channel. Equipped with a backflow prevention device. The prior art, China Registered Utility Model No. CN213274379U, discloses a backflow prevention horizontal spiral vane water meter provided with a valve core and a connecting shell, and the connecting shell is arranged at an angle. When water flows back, the connection shell can be driven to prevent backflow of water. However, when using an actual water meter, the inside of the case is not in a vacuum state and air exists, so the air interferes with backflow prevention in the process of pushing the valve core out of the water flow. These problems affect the accuracy of water meter measurements.

China Registered Utility Model Gazette CN213274379U (2021.05.25.)

The present invention is intended to solve the problems of the prior art described above,

The object of the present invention is to include a water meter case having an inflow channel, an outlet channel, and a backflow prevention hole communicating with the outlet channel, and a backflow prevention device for blocking the backflow of fluid in the water meter case, wherein the backflow prevention device includes: , a valve cover mounted on the water meter case and forming a check space together with the outer shell of the water meter, the check space communicating with the outflow channel through the backflow prevention hole, and fixed to the valve cover to define the check space as a second part in the valve cover. A guide sleeve divided into one cavity and a second cavity communicating with the outflow channel, a valve core slidingly extending within the check space, the guide sleeve includes a guide slide penetrating both ends of the guide sleeve, and the guide At least one pressure relief hole surrounds the slide and communicates between the first cavity and the second cavity, wherein the valve core slides relative to the valve cover along the guide slide, and wherein the valve core is configured to move the counterflow in the sealing position. The aim is to provide a water meter that can immediately prevent backflow and improve the durability of the backflow prevention device by sealing the prevention hole and separating it from the backflow prevention hole in the open position.

An object of the present invention is that the valve core includes a connecting shaft slidably disposed on the guide slide, a sealing plate connected to one end of the connecting shaft, the sealing plate is located in a second cavity, and the connecting shaft is connected to the guide slide. By sliding along the sealing plate to seal or open the backflow prevention hole, a water meter is provided in which backflow is prevented by the pressure of air within the guide slide.

The purpose of the present invention is to provide a water meter in which the connection shaft has a core groove formed at an end in a direction opposite to the sealing plate, and the core groove is a tapered groove, thereby improving the forward and backward movement of the valve core by air. will be.

The object of the present invention is that the valve cover includes a fixing sleeve coupled to the water meter case, a backflow prevention adjustment member coupled to the fixing sleeve to enable reciprocating movement along the extension direction of the fixing sleeve, and the backflow prevention. The adjusting member is disposed within the fixing sleeve, and the guide sleeve is fixed to the fixing sleeve to provide a water meter capable of adjusting the degree of sealing and opening of the backflow prevention hole.

The purpose of the present invention is to open both ends of the fixing sleeve, one end of the fixing sleeve is coupled to the water meter case, and the other end of the fixing sleeve is coupled with a backflow prevention adjustment member to seal the opening at the other end of the fixing sleeve, The backflow prevention adjustment member includes a mounting head coupled to the inner surface of the fixing sleeve and a check shaft whose end is connected to the mounting head within the check space, providing a water meter that allows the check shaft to move the valve core. It is done.

The object of the present invention is that at least a portion of the free end of the check shaft enters or overlaps the guide slide, and an air passage through which fluid passes is formed between the outer circumferential wall of the check shaft and the inner wall of the guide slide to form a valve. The aim is to provide a water meter capable of transmitting pressure by air in the direction in which the core extends.

The object of the present invention is to have a fixing groove formed at the upper end of the inner wall of the fixing sleeve, and the fixing groove further include a guide ring for restricting the movement of the backflow prevention adjustment member in a direction away from the backflow prevention hole. The purpose is to provide a water meter that prevents the control member from falling off.

The purpose of the present invention is to provide a water meter in which the opening of the first cavity is smaller than the opening of the second cavity so that the force acting on the valve core is maximized when the air in the second cavity flows into the first cavity.

Additionally, an object of the present invention is to provide a water meter that prevents the reader from rotating relative to the metering unit.

Additionally, an object of the present invention is to provide a water meter that prevents measurement from being inaccurate due to external magnetic force.

In order to achieve the above-described object, the present invention is implemented by an embodiment having the following configuration.

According to one embodiment of the present invention, the present invention includes a water meter case having an inflow channel, an outlet channel, and a backflow prevention hole communicating with the outlet channel, and a backflow prevention device for blocking the backflow of fluid in the water meter case. The backflow prevention device includes a valve cover that is mounted on the water meter case and forms a check space together with the water meter outer shell, and a guide sleeve that is fixed to the valve cover and divides the check space into a first cavity and a second cavity. , and a valve core slidingly extending within the check space, wherein the valve core seals the backflow prevention hole in a sealed position and is separated from the backflow prevention hole in an open position.

According to one embodiment of the present invention, the check space is in communication with an outflow channel through the backflow prevention hole, and water flowing into the outflow channel flows into the check space and then flows out of the water meter case. .

According to one embodiment of the present invention, the second cavity is in communication with the outflow channel, and the guide sleeve includes a guide slide that penetrates both ends of the guide sleeve, surrounds the guide slide, and is located between the first cavity and the second cavity. It includes at least one pressure relief hole in communication, and the valve core slides relative to the valve cover along a guide slide.

According to one embodiment of the present invention, the valve core includes a connection shaft slidably disposed on the guide slide, a sealing plate connected to one end of the connection shaft, and the sealing plate is located in a second cavity and connected to the connection shaft. The axis is characterized in that the sealing plate seals or opens the backflow prevention hole by sliding along the guide slide.

According to one embodiment of the present invention, the connecting shaft is characterized in that a core groove is formed at an end in a direction opposite to the sealing plate.

According to one embodiment of the present invention, the core groove is characterized as a tapered groove.

According to one embodiment of the present invention, the valve cover includes a fixing sleeve coupled to the water meter case, a backflow prevention adjustment member coupled to the fixing sleeve to enable reciprocating movement along the extension direction of the fixing sleeve, The backflow prevention adjusting member is disposed within the fixing sleeve, and the guide sleeve is fixed to the fixing sleeve.

According to one embodiment of the present invention, both ends of the fixing sleeve are open, one end of the fixing sleeve is coupled to the water meter case, and the other end of the fixing sleeve is coupled with a backflow prevention adjustment member to seal the opening of the other end of the fixing sleeve. It is characterized by:

According to one embodiment of the present invention, the backflow prevention adjustment member includes a mounting head coupled to the inner surface of the fixing sleeve, and a check shaft with one end connected to the mounting head within the check space.

According to one embodiment of the present invention, the backflow prevention adjustment member includes a mounting head coupled to the inner surface of the fixing sleeve, and a check shaft whose end is connected to the mounting head within the check space.

According to one embodiment of the present invention, at least a portion of the free end of the check shaft enters or overlaps the guide slide, and an air passage through which fluid passes is formed between the outer circumferential wall of the check shaft and the inner wall of the guide slide. It is characterized by being formed.

According to one embodiment of the present invention, an operating groove is formed at the end of the mounting head opposite to the check shaft.

According to one embodiment of the present invention, a seal is provided between the fixing sleeve and the inner wall of the fixing sleeve and between the fixing sleeve and the water meter case.

According to one embodiment of the present invention, a fixing groove is formed at the upper end of the inner wall of the fixing sleeve, and a guide ring for restricting the movement of the backflow prevention adjustment member in the direction away from the backflow prevention hole is further formed in the fixing groove. It is characterized by including.

According to one embodiment of the present invention, the opening of the first cavity is smaller than the opening of the second cavity.

The present invention has the following effects through the above-described configuration.

The present invention includes a water meter case having an inflow channel, an outlet channel, and a backflow prevention hole communicating with the outlet channel, and a backflow prevention device for blocking the backflow of fluid in the water meter case, wherein the backflow prevention device includes: A valve cover mounted on the water meter case and forming a check space together with the water meter shell, the check space communicating with an outflow channel through the backflow prevention hole, and a first cavity in the valve cover fixed to the valve cover to define the check space. and a guide sleeve divided into a second cavity in communication with the outflow channel, and a valve core slidingly extending within the check space, wherein the guide sleeve includes a guide slide penetrating both ends of the guide sleeve, and the guide slide. At least one pressure relief hole surrounds and communicates between the first cavity and the second cavity, wherein the valve core slides relative to the valve cover along the guide slide, and wherein the valve core is connected to the backflow prevention hole in the sealing position. By sealing and separating from the backflow prevention hole in the open position, immediate backflow prevention and durability of the backflow prevention device can be improved.

In the present invention, the valve core includes a connecting shaft slidably disposed on the guide slide, a sealing plate connected to one end of the connecting shaft, the sealing plate is located in a second cavity, and the connecting shaft is positioned along the guide slide. By sliding, the sealing plate seals or opens the backflow prevention hole, thereby preventing backflow due to air pressure within the guide slide.

The present invention has the effect of providing a water meter in which forward and backward movement of the valve core by air is improved by forming a core groove at the end of the connecting shaft in a direction opposite to that of the sealing plate, and the core groove is a tapered groove. You can get it.

In the present invention, the valve cover includes a fixed sleeve coupled to the water meter case, a backflow prevention adjustment member coupled to the fixed sleeve to enable reciprocating movement along the extension direction of the fixed sleeve, and the backflow prevention adjustment member. is disposed within the fixed sleeve, and the guide sleeve is fixed to the fixed sleeve to adjust the degree of sealing and opening of the backflow prevention hole.

In the present invention, both ends of the fixing sleeve are open, one end of the fixing sleeve is coupled to the water meter case, and the other end of the fixing sleeve is coupled with a backflow prevention adjustment member to seal the opening of the other end of the fixing sleeve, and the backflow is provided. The prevention adjustment member may include a mounting head coupled to the inner surface of the fixing sleeve and a check shaft with one end connected to the mounting head within the check space, so that the check shaft moves the valve core.

In the present invention, at least a portion of the free end of the check shaft enters or overlaps the guide slide, and an air passage through which fluid passes is formed between the outer circumferential wall of the check shaft and the inner wall of the guide slide, so that the valve core This produces the effect of allowing pressure to be transmitted by air in an extended direction.

In the present invention, a fixing groove is formed at the upper end of the inner wall of the fixing sleeve, and the fixing groove further includes a guide ring for restricting the movement of the backflow prevention adjustment member in a direction away from the backflow prevention hole to control backflow prevention. It has the effect of preventing the member from falling off.

The present invention has the effect of providing a water meter in which the force acting on the valve core is maximized when the air in the second cavity flows into the first cavity by making the opening of the first cavity smaller than the opening of the second cavity.

Additionally, the present invention has the effect of providing a water meter that prevents the reader from rotating with respect to the measuring unit.

Additionally, the present invention has the effect of providing a water meter that prevents measurement from being inaccurate due to external magnetic force.

1 is a perspective view of a water meter 100 according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of the water meter 100 according to an embodiment of the present invention.
Figure 3 is a plan view of a water meter 100 according to an embodiment of the present invention.
Figures 4 and 5 are cross-sectional views taken along line AA of Figure 3
Figure 6 is an enlarged view of part B of Figure 5
7 and 8 are diagrams showing the combination of the reader 40 and the measuring instrument cover 30 according to an embodiment of the present invention.
Figure 9 is a perspective view of a magnetic shield assembly according to an embodiment of the present invention.
Figure 10 is an exploded perspective view of a magnetic shield assembly according to an embodiment of the present invention.
Figure 11 is a perspective view of an insulating member 61 according to another embodiment of the present invention.
Figure 12 is a cross-sectional view of AA according to an embodiment of the present invention
Figure 13 is an exploded perspective view of a magnetic shield assembly according to another embodiment of the present invention.
Figure 14 is an exploded perspective view of the backflow prevention device 70 according to an embodiment of the present invention.
15 and 16 are diagrams showing when the valve core 75 moves forward and backward toward the backflow prevention hole 15 according to an embodiment of the present invention.
Figure 17 is a cross-section of the backflow prevention adjustment member 712 with an operating groove 716 according to an embodiment of the present invention.
18 is a plan view of the operating groove 716 according to an embodiment of the present invention.
Figure 19 is a perspective view of the water opening/closing tool 80 accommodated in the operating groove 716 according to an embodiment of the present invention.
Figure 20 is a diagram showing a magnetic shielding cover according to another embodiment of the present invention.
Figure 21 is a cross-sectional view taken along line BB of Figure 20.

Hereinafter, the water meter according to the present invention will be described in detail with reference to the attached drawings. Additionally, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted. It should be noted that like elements in the drawings are represented by like symbols wherever possible. Additionally, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted. Unless otherwise specified, all terms in this specification have the same general meaning as understood by a person skilled in the art to which the present invention pertains, and if there is a conflict with the meaning of the terms used in this specification, this specification Follow the definitions used in the specification. Throughout the specification, when a part "includes" a certain component, this does not mean excluding other components unless specifically stated to the contrary, but also means that other components may also be included. Terms such as “~unit” described mean a unit that processes at least one function or operation. In addition, when certain components are said to be "connected," this is not limited to the components being directly contacted and fastened to each other, but also includes being connected through other components, and even if not connected, a certain amount of force or energy can be transmitted. It may mean that it is arranged so that Terms such as "1st~" and "2nd~" may be used to indicate the same or substantially the same configuration in a different order, and may be used to indicate the same or substantially the same configuration as the configuration without "1st", "2nd", etc. It can be interpreted as a composition. Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings.

Referring to Figures 1 to 3, the water meter 100 according to a preferred embodiment of the present invention is used to measure the flow of water, and during measurement, the leader falls off from the pipe or the leader rotates, making accurate flow measurement impossible. You can prevent a termination situation. In addition, the water meter 100 according to an embodiment of the present invention can prevent electrochemical corrosion of the shield provided for magnetic shielding and quickly prevent backflow when water flows back in a water pipe. The water meter 100 includes a water meter case 10, a measuring unit 20, a measuring unit cover 30, a reader 40, a water meter cover 50, a magnetic shield assembly 60, and a backflow prevention device 70. may include.

Referring to Figures 1 to 4, the water meter case 10 is configured to supply fluid while flowing therein, and constitutes at least a portion of the external shape of the water meter 100. The water meter case 10 is pressed by a removably connected measuring unit cover 30 to fix the measuring unit cover 30 to the water meter case 10. The water meter case 10 includes a seating cavity 11, an inlet channel 12, an outlet channel 13, a fixing cavity 14, and a backflow prevention hole 15 connected to the outlet channel 13. In addition, the water meter case 10 may further include a communication part 16 and a partition wall 17.

The seating cavity 11 is a cavity formed inside the water meter case 10 so that the measuring unit 20 can be installed or seated, and is formed to allow fluid to flow in or out.

The inlet channel 12 and the outlet channel 13 are respectively disposed at both ends of the seating cavity 11 and communicate with the seating cavity 11. Water flows into the seating cavity (11) through the inlet channel (12) and then flows out of the seating cavity (11) into the outlet channel (13). The water meter case 10 is preferably made of stainless steel to prevent corrosion.

The outflow channel 13 consists of a first outflow passage 131 and a second outflow passage 134, and a backflow prevention hole 15 is formed between them to form a first outflow passage 131 and a second outflow passage 134. (134) can communicate fluidly. While the inside of the water meter case 10 from the inlet channel 12 to the outlet channel 13 is formed relatively horizontally in one direction, the first outflow passage 131 is disposed at an angle, and the second outflow passage 134 is It is placed horizontally and communicates with the outside.

The fixing cavity 14 is configured so that a backflow prevention device 70, which will be described later, can be installed and fixed, and the backflow prevention hole 15 is located between the first outflow path 131 and the second outflow path 134. As described later, the opening formed in the water seal prevents the backflow of water in the water supply by sealing it when the water flows back. One end of the fixed cavity 14 may be in communication with the outflow channel 13 through the backflow prevention hole 15. The water flowing in through the inflow channel 12 passes through the seating cavity 11, and the flow rate is measured by the measuring unit 20 and the leader 40, which will be described later, and the water flows into the fixing cavity 14 through the backflow prevention hole 15. and flows toward the outflow channel (13).

The communication portion 16 is a space provided to allow fluid to communicate between the fixed cavity 14 and the outlet channel 13.

The partition walls 17 extending inside the water meter case 10 are provided to be spaced apart from each other, and the opening between the spaced parts may be defined as a backflow prevention hole 15.

The fluid flowing through the first outflow passage 131 is formed to pass through the backflow prevention hole 15, and the backflow prevention hole 15 is in communication with the fixed cavity 14, and the fixed cavity 14 is a communication part ( It communicates with the second outflow passage 134 through 16). The other end of the fixing cavity 14 penetrates the water meter case 10 to form an opening. The fixed cavity 14 is disposed obliquely, and the included angle between the fixed cavity 14 and the second outflow passage 134 is an acute angle. That is, the fixed cavity 14 and the second outlet 134 extend at an angle less than 90 degrees, and as the second outlet 134 extends approximately horizontally, the fixed cavity 14 extends obliquely. It can be understood that

Referring to FIGS. 5 and 6, the measuring unit 20 is configured to measure the flow rate of water passing through the water meter case 10, and the measuring unit 20 is located in a seating cavity within the water meter case 10. It can be installed at (11). The measuring unit 20 includes an impeller chamber 21 and a rotatable impeller 23 installed in the impeller chamber 21, and may further include a first magnetic coupling shaft 25. It can be understood by those skilled in the art that the measurement unit 20 may include other structures not disclosed in this specification.

The impeller chamber 21 accommodates the impeller 23 therein and provides a space for the impeller to rotate, and the impeller 23 rotates inside the impeller chamber 21. A plurality of guide holes (not shown) are formed in the impeller chamber 21 at intervals along the circumferential direction, so that the internal cavity of the impeller chamber 21 communicates with the inflow passage 12 and the outflow passage 13. The impeller 23 rotates due to water flowing into the impeller chamber 21 through the inflow passage 12 and the seating cavity 11, and the water quantity can be measured through the rotation of the impeller.

The first magnetic coupling shaft 25 is fixedly connected to the center of the impeller 23 and may extend from the impeller 23 to one side, preferably upward. A magnetic coil (not shown) may be provided on the upper part of the first magnetic coupling shaft 25, so that the first magnetic coupling shaft 25 rotates together with the impeller 23 to supply water to the leader 40, which will be described later, through magnetic force. Make it possible to measure.

Referring to Figures 2 and 7 to 8, the measuring unit cover 30 is installed on the water meter case 10 so that the measuring unit 20 is covered by the measuring unit cover 30. The measuring unit cover 30 is Prevents water inside the seating cavity (11) from leaking to the outside of the water meter (100). In this embodiment, the measurement unit cover 30 includes a cover body 31, a cover peripheral wall 32, a seal 35, and a locking portion 36.

The cover body 31 has a substantially disk shape and extends from one side of the measuring unit cover to cover the measuring unit 20. A ridge 310 protruding to one side is formed at or near the center of the cover body 31, and a receiving space 312 for accommodating the upper side of the first magnetic coupling shaft 25 is formed in the ridge. .

The cover peripheral wall 32 is connected to the water meter case 10 and surrounds the upper surface of the cover body 31. In this embodiment, the cover peripheral wall 32 is supported by the water meter case 10. do.

A mounting groove 34 may be formed on the bottom of the cover peripheral wall 32 of the measurement unit cover 30. As shown in FIG. 2, the mounting groove 34 accommodates the leader 40 and may be formed in the direction toward the water meter case 10 rather than in the direction in which it is coupled with the leader. The seal 35 may be seated in the mounting groove 34.

The seal 35 is inserted between the cover peripheral wall 32 of the measuring unit cover 30 and the water meter case 10 to achieve a sealing and leak prevention effect. Accordingly, the cover peripheral wall 32 can simultaneously contact the water meter case 10 and the reader 40 and be connected to the water meter case 10 and the reader 40.

The measuring unit cover 30 is provided with a locking portion 36. Specifically, a groove is formed in the upper part of the cover peripheral wall 32, and the groove constitutes a locking portion 36. In a preferred embodiment of the present invention, there are a plurality of locking portions 36, and the plurality of locking portions 36 may be distributed at intervals along the circumferential direction of the cover peripheral wall 32. As shown in FIG. 7, the locking portions 36 may be formed radially at 90-degree intervals based on the center of the measuring unit cover 30.

Referring to FIGS. 2 and 5 to 8, the reader 40 is configured to read the rotation of the impeller 23 in the measuring unit 20 and display the measured quantity, and is installed on the measuring unit cover 30. It can be. The leader 40 may include a leader housing 41 and a clamping part 42. It can be understood by those skilled in the art that the leader 40 may include other structures not disclosed in this specification.

The leader housing 41 is a component that forms the outer shape of the reader and is generally made of a non-metallic material such as plastic. The leader housing 41 may include a housing 411 surrounding the inside of the leader and a flange 413 protruding outward from the bottom peripheral edge of the housing 411. That is, as shown in FIGS. 7 and 8, the flange 413 may have a larger diameter than the housing 411.

The clamping part 42 is provided on one side of the reader 40 to prevent the reader 40 from rotating with respect to the measuring unit cover 30, and is coupled to the above-mentioned locking part 36 or clamped to rotate. can be prevented. In a preferred embodiment of the present invention, the clamping portion 42 may be formed as a protrusion protruding from the bottom of the flange 413. There are a plurality of clamping parts 42, and the plurality of clamping parts 42 are distributed at intervals along the circumferential direction of the flange 413, and the plurality of clamping parts 42 are each connected to a plurality of locking parts 36. clamped by As in the case of the catching portion 36, the clamping portion 42 may be formed radially at 90-degree intervals based on the center of the flange 413.

The leader 40 is connected to the measuring part 20, and in order to make the clamping of the leader 40 and the measuring part cover 30 more stable, each clamping part 42 and the corresponding locking part 36 are connected to the water meter. Constructs a leader rotation prevention structure. In other words, the clamping part 42 and the locking part 36 are formed in complementary shapes and can be coupled, and when the clamping part 42 protrudes or is recessed from the flange 413, the locking part covers complementary to it. It may be indented or protruded along the perimeter wall. One of the clamping part 42 and the locking part 36 may be a protrusion, and the other may be a recessed groove formed complementary to the protrusion to be coupled with the protrusion.

The clamping part 42 provided on the reader 40 and the locking part 36 provided on the measuring part cover 30 prevent the reader 40 from rotating with respect to the measuring part cover 30. This relatively simple structure can lower the production cost of the water meter 100, and at the same time, the clamping part 42 is fixed to the leader 40 and the clamping part 36 is fixed to the measuring part cover 30 during maintenance. There is no loss and it is more convenient to use.

It will be appreciated that in other embodiments, the locking portion 36 may be configured as a protrusion. In this case, the clamping part 42 may be formed as a groove structure that is fitted with the fixing part 36 through a snap fit.

The leader 40 may further include a second magnetic coupling axis 45 arranged coaxially with the first magnetic coupling axis 25. The second magnetic coupling shaft 45 is installed in the housing 411, and a magnetic induction member (not shown) is installed at the bottom of the second magnetic coupling shaft 45, and the magnetic induction member is the first magnetic coupling shaft ( It is arranged to face the magnetic coil provided at the top of 25). The reader can display the flow rate measured by the second magnetic coupling axis 45 and the first magnetic coupling axis 25.

As can be seen in FIGS. 6 and 8, the housing 411 has a recessed portion 411a recessed to a predetermined depth in the bottom surface, and a protrusion 411b protruding downward at a predetermined length in the central portion of the recessed portion 411a. may include.

The protrusion 411b may be formed so that its central portion protrudes downward by a predetermined length compared to the periphery in order to accommodate a portion of the second magnetic coupling shaft 45. Through this, the distance between the second magnetic coupling axis 45 and the first magnetic coupling axis 25 becomes closer, making it possible to smoothly measure the magnetic force according to the rotation of the first magnetic coupling axis 25. The recessed portion 411a may be recessed to a predetermined depth so that at least a portion of the magnetic shield assembly 60, which will be described later, surrounds the protruding portion 411b while the protruding portion 411b protrudes compared to the surrounding area.

Therefore, in one embodiment of the present invention, the water flowing in through the inflow channel 12 flows back into the impeller chamber 21 through the seating cavity 11 and rotates the impeller 23. As the impeller 23 rotates, the first magnetic coupling shaft 25 and the magnetic coil rotate, and magnetic force is transmitted to the second magnetic coupling shaft 45. The reader 40 can measure and display the quantity by reading the magnetic force and/or change in magnetic force transmitted to the second magnetic coupling shaft 45.

Referring again to FIGS. 1 to 2 and 5 , the water meter cover 50 may be provided to block at least one side of the water meter 100 while constituting the external shape of the water meter 100. The water meter cover 50 is preferably screwed to the water meter case 10 and includes an end cover 51 and a connecting wall 52.

In one embodiment, a mounting opening 512 is formed in the end cover 51, and the housing 411 of the leader housing 41 is formed to be visible from the outside through the mounting opening 512 so that the user can use the water meter. It can facilitate observation and reading. Additionally, the end cover 51 may cover the upper surface of the flange 413 of the leader 40 to prevent the leader 40 from being separated from the water meter case. That is, the diameter of the hollow mounting opening 512 in the end cover 51 is formed to be smaller than the diameter of the flange 413, so that the leader 40 does not fall out through the mounting opening 512. In addition, the end cover 51 is in contact with the upper surface of the cover peripheral wall 32 of the measuring unit cover 30 to fix the measuring unit cover 30 to the water meter case 10, thereby connecting the measuring unit cover 30 and the water meter case 10. Airtightness between the meter cases 10 can be improved.

The connecting wall 52 is configured to surround and connect the end cover 51. The connecting wall 52 is connected to the outside of the water meter case 10 by a sleeve and is connected to the water meter case 10 by a screw type. It can be connected to .

When assembling the water meter 100, first install the measuring part 20 in the seating cavity 11 of the water meter case 10, then place the measuring part cover 30 on the top of the non-metering part 20, and place the measuring part cover 30 on the non-metering part 20. The cover peripheral wall 32 of (30) is supported on the water meter case 10. And, the reader 40 is installed on the measuring unit cover 30. Specifically, the flange 413 of the reader 40 is supported on the partition wall 32 of the measuring unit cover 30. And the clamping part 42 on the flange 413 of the leader 40 and the locking part 36 on the peripheral wall 32 of the partition cover are clamped to prevent the reader 40 from rotating with respect to the measuring unit cover 30. Let's do it.

Thereafter, the water meter cover 50 is sleeved to the outside of the leader housing 41 through the mounting opening 512 and is screwed to the water meter case 10. In addition, by rotating the water meter cover 50, the water meter cover 50 is connected to the measuring part cover 30 until the end cover 51 of the water meter cover 50 presses the surrounding wall 32 of the measuring part cover 30. ) and fix it so that the measuring unit cover 30 is in close contact with the water meter case 10. At this time, the end cover 51 supports the upper part of the flange 413 of the leader 40, and the cooperation of the end cover 51 and the flange prevents the leader 40 from being separated from the measurement unit cover 30. there is.

Referring to FIGS. 6, 9, and 10, the magnetic shield assembly 60 consists of the upper part of the first magnetic coupling shaft 25 equipped with a magnetic coil and the second magnetic coupling shaft 45 equipped with a magnetic induction member. By surrounding the lower part, the water meter's resistance to external magnetic fields is improved, allowing the water meter according to the present invention to detect water quantity without being affected by external magnetic fields.

The magnetic shield assembly 60 includes an insulating member 61, a magnetic shield inner ring 62, and a magnetic shield outer ring 64, and the magnetic shield inner ring 62 extends or is disposed opposite to the measurement unit cover 30. It is disposed on the upper surface of the insulating member 61, and the magnetic shielding outer ring 64 is disposed around the outer circumference of the magnetic shielding inner ring 62.

In order to improve the corrosion resistance of the water meter 100 when manufacturing a water meter, the water meter case 10 and the measuring unit cover 30 are generally made of stainless steel. Since stainless steel does not have a magnetic shielding effect, the magnetic shielding inner ring ( 62) and the magnetic shielding outer ring 64 cannot be made of stainless steel and can only be made of metal with a magnetic shielding effect such as pure iron.

Since the measuring unit cover 30, magnetic shielding inner ring 62, and magnetic shielding outer ring 64 are made of different conductive materials, if the magnetic shielding inner ring 62 and magnetic shielding outer ring 64 directly contact the measuring unit cover 30, It is easy to cause electrochemical corrosion and causes corrosion of the measuring unit cover (30), magnetic shield inner ring (62), and magnetic shield outer ring (64). In this embodiment, the measuring unit cover 30 is separated from the magnetic shielding inner ring 62 and the magnetic shielding outer ring 64 using the insulating member 61 to form the measuring unit cover 30, the magnetic shielding inner ring 62, and the magnetic shielding outer ring. By preventing electrochemical corrosion of (64), the durability of the water meter can be improved.

The insulating member 61 is preferably made of plastic. In this embodiment, the insulating member 61 includes a bottom plate 611, a fixing port 612, a limiting groove 613, and an insulating peripheral wall 614.

A fixing port 612 is formed at approximately the center of the bottom plate 611, the first magnet coupling shaft 25 penetrates through the fixture 612, and the insulating member 61 covers the measuring unit. It is detachably mounted at (30). Specifically, the bottom plate 611 is sleeved on the outside of the raised portion 310 of the measuring unit cover 30 through the fixture 612, and one end of the first magnetic coupling shaft 25 equipped with a magnetic coil is a fixed port. It is inserted into the space formed by the insulating peripheral wall 614 along 612. A limiting groove 613 recessed into a ring shape may be formed in the bottom plate 611, and the lower portion of the magnetic shield outer ring 64, which will be described later, can be accommodated and fixed in the limiting groove 613.

The insulating peripheral wall 614 is connected to the upper surface of the bottom plate 611 and is disposed on the outer periphery of the fixing port 612. In this embodiment, the insulating peripheral wall 614 may be provided with a weight reduction groove 615. The weight reduction groove 615 extends along the circumferential direction of the insulating peripheral wall 614 and penetrates the upper surface of the insulating peripheral wall 614, which increases the actual thickness of the insulating peripheral wall 614, thereby increasing the shielding inner ring (described later). 62) and the magnetic coupling shaft can be separated and the separation effect can be improved, and the raw materials required for manufacturing the insulating member 61 can be reduced, thereby improving productivity. In other words, the weight reduction groove 615 can be understood as a space enclosed in a ring shape between the fixing port 612 and the insulating peripheral wall. In this embodiment, the insulating member 61 further includes an outer peripheral wall 616, and the outer peripheral wall 616 is connected to surround the upper surface of the bottom plate 611.

Both the magnetic shielding inner ring 62 and the magnetic shielding outer ring 64 are disposed on the bottom plate 611 and may be located between the insulating peripheral wall 614 and the outer peripheral wall 616. The magnetic shielding inner ring 62 and the magnetic shielding outer ring 64 are made of a conductive material to enable magnetic field shielding, and may be provided in a ring shape with a predetermined thickness and height. The magnetic shield inner ring 62 is sleeved on the outside of the insulating peripheral wall 614, and the magnetic shield outer ring 64 is arranged around the outer circumference of the magnetic shield inner ring 62 and is spaced apart from the magnetic shield inner ring 62. That is, the magnetic shielding inner ring 62 and the magnetic shielding outer ring 64 may be disposed on the insulating member in a direction opposite to the measuring unit cover with respect to the insulating member.

In this embodiment, the magnetic shielding inner ring 62 may include a shielding ring 620, a magnetic shielding cover 621 connected to the upper part of the shielding ring 620, and an inner ring port 622.

The shielding ring 620 is sleeved on the outside of the insulating peripheral wall 614, and the lower end of the shielding ring 620 is disposed on the bottom plate 611 so that the magnetic shielding inner ring 62 can be separated from the insulating member 61. You can. Since the magnetic shielding cover 621 is connected at the top of the shielding ring 620, the lower surface of the shielding ring 620 facing the magnetic shielding cover 621 is on the insulating member 61, preferably on the bottom plate 611. can be placed in

By sleeving the shield ring 620 to the insulating peripheral wall 614, the magnetic shield inner ring 62 can be positioned to prevent the magnetic shield inner ring 62 from moving freely relative to the insulating member 61. At the same time, as shown in FIG. 6, the raised portion 310 of the measuring unit cover 30 and the magnetic shielding inner ring 62 are separated by an insulating peripheral wall 614, and the magnetic shielding inner ring 62 is connected to the raised portion. Prevents electrochemical corrosion by preventing contact with (310).

As shown in FIGS. 6 and 9, the magnetic shield cover 621 may be provided with an inner ring port 622 as an opening penetrating it. The inner ring port 622 communicates with the space formed by the insulating peripheral wall 614. Accordingly, the lower end of the second magnetic coupling shaft 45 provided with the magnetic induction member may pass through the inner ring port and extend into the space surrounded by the insulating peripheral wall 614 or the magnetic shielding cover 621.

The magnetic shielding outer ring 64 may be mounted on the bottom plate 611 and spaced apart from the shielding ring 620 so that the magnetic shielding outer ring 64 can be detached from the insulating member. In addition, the outer peripheral surface of the magnetic shielding outer ring 64 is in contact with the inner surface of the outer peripheral wall 616, thereby preventing the magnetic shielding outer ring 64 from moving freely.

In one embodiment, a ring-shaped limiting groove 613 is formed on the upper surface of the bottom plate 611 so that the lower end of the magnetic shield outer ring 64 can be received and fixed in the limiting groove 613.

According to another embodiment of the present invention, the magnetic shielding inner ring 62' and the magnetic shielding cover 621' may be configured to have a shape as shown in FIGS. 20 and 21. That is, the end of the magnetic shielding cover 621' on the inner ring port 622' side is rolled into the inner ring port 622' so that the inner space is surrounded by the magnetic shielding cover 621', so that the inner space is surrounded by the magnetic shielding cover 621'. This makes it possible to obtain the effect of shielding magnetic force.

Referring to another embodiment of the present invention shown in FIG. 11, the other embodiment of the present invention may have substantially the same structure as the water meter 100 of the preferred embodiment, but the difference is that of the insulating member 61. It's in the structure.

In the above embodiment, the insulating member 61 includes a bottom plate 611, an insulating peripheral wall 614, and an outer peripheral wall 616, and a fixing port 612 is provided at approximately the center of the bottom plate 611. The fixing port 612 is for the first magnetic coupling shaft 25 to pass through, and the insulating member 61 is detachably mounted on the measurement unit cover 30. A plurality of protruding ribs 617 are installed on the inner surface of the insulating peripheral wall 614, and a plurality of protruding ribs 617 are arranged at intervals along the circumference of the inner peripheral surface of the insulating peripheral wall 614.

The insulating member 61 according to another embodiment of the present invention is provided with a plurality of protruding ribs 617 on the inner surface of the insulating peripheral wall 614 to increase the strength of the insulating peripheral wall 614 to increase the strength of the measuring unit cover 30. ) can be better fixed.

It can be understood that the connection form of the magnetic shielding outer ring 64, the magnetic shielding inner ring 62, and the insulating member 61 is not limited to the detachable connection in this embodiment.

For example, in another embodiment, the magnetic shielding outer ring 64 and the magnetic shielding inner ring 62 may be fixedly connected to the insulating member 61 through bonding or the like. It can be understood that the insulating member 61 may be set to different shapes depending on actual needs.

Referring to Figures 12 and 13, the water meter 100 according to another embodiment of the present invention includes a ring made of a conductive material for additional magnetic field shielding between the magnetic shielding outer ring 64 and the magnetic shielding inner ring 62. At least one shielding ring 63 and a leader shielding ring 65 having a shape may be added. In another embodiment, the shielding ring 63 may be provided outside the magnetic shielding outer ring 64. The shielding ring 63 may be arranged to be spaced apart from the magnetic shielding outer ring 64 and the magnetic shielding inner ring 62 at a predetermined distance, or may be in contact with the magnetic shielding outer ring 64 and the magnetic shielding inner ring 62 with an insulating material interposed therebetween.

In one embodiment, the shielding ring 63 may be provided with a seating protrusion 631 so that the magnetic shielding inner ring 62 is sleeved and accommodated therein. The seating protrusion 631 may protrude inward by a predetermined length from the inner peripheral surface at the lower side of the shielding ring 63, and the seating protrusion 631 prevents electrochemical corrosion between the magnetic shielding inner ring 62 and the shielding ring 63. To prevent this, it can be made of an insulating material such as plastic or silicone.

Referring again to FIG. 12, the leader shielding ring 65 is provided within the reader 40 and is protected from the magnetic field outside the reader 40 by measuring devices within the reader or the first magnetic coupling axis 25 and the second magnetic coupling axis 45. ) can be provided to protect. The leader shielding ring 65 may be provided in a ring shape made of a conductive material inside the housing 411 and may be manufactured using a molding method. A portion of the lower portion of the leader shielding ring 65 may overlap with a portion of the magnetic shielding inner ring 62 in the vertical direction. In more detail, the lower end of the leader shielding ring 65 may be located below the recessed portion 411a of the housing 411, and the magnetic shielding cover 621 of the magnetic shielding inner ring 62 may be located below the recessed portion 411a. ) and can be arranged to surround the second magnetic coupling axis 45 and the protrusion 411b at a height between the protrusion 411b. Accordingly, the lower end of the leader shielding ring 65 may be located below the upper end of the magnetic shielding inner ring 62, and through this, magnetic force in the horizontal direction can be further blocked.

Although not shown, the leader shielding ring 65 may have a partially cut ring shape with a C-shaped cross-section instead of a ring shape with an O-shaped cross-section. Since the leader shielding ring 65 is made of a conductive material of a predetermined thickness, it can have a certain degree of elasticity. When the leader shielding ring 65 has a C-shaped cross-section, the leader shielding ring 65 is used when manufacturing the water meter 100. After (65) is shrunk and inserted into the housing 411, it can be restored and accommodated within the housing 411 so as to contact the inner surface of the housing 411. Of course, the leader shielding ring 65 having a C-shaped cross-section and a partially cut ring shape may also be provided in the housing 411 by molding.

When assembling the water meter 100 including the magnetic shield assembly 60, first install the measuring part 20 in the seating cavity 11 of the water meter case 10, and then install the measuring part cover 30 on the top of the non-metering part 20. ) is positioned, and the cover peripheral wall 32 of the measuring unit cover 30 is supported on the water meter case 10.

Then, a magnetic shield assembly 60 is installed on the upper surface of the measurement unit cover 30. Specifically, the bottom plate 611 of the magnetic shield assembly 60 is sleeved on the outside of the raised portion 310 of the measurement unit cover 30 through the fixing port 612, and the bottom plate 611 is attached to the cover body 31. ) is supported. The upper part of the first magnetic coupling axis 25 of the measuring unit 20, where the measuring unit cover 30, the raised part 310, and the magnetic coil are located, is located in a space surrounded by the insulating peripheral wall 614, and at this time, the magnetic shielding outer ring ( 64) and the magnetic shield inner ring 62 are magnetic coils that surround the upper end of the first magnetic coupling shaft 25 and the lower end of the second magnetic coupling shaft 45.

Referring to FIGS. 14 to 16, the backflow prevention device 70 is installed inside the water meter case 10 and is located on the outflow channel 13 of the water meter case 10, and flows into the water meter 100. It may be provided to prevent backflow of water. The backflow prevention device 70 can open and close the backflow prevention hole 15, so that the water flowing into the water meter case 10 does not go out toward the outlet channel 13, but instead heads back toward the inflow channel 12, or the water flows into the water meter case 10. When the water meter 100 is stopped or installed upside down, the backflow prevention hole 15 is closed to prevent water from flowing back. The backflow prevention device 70 can prevent water from the outflow channel 13 from flowing back into the measuring unit 20 and affecting the measurement accuracy of the water meter 100. The backflow prevention device 70 includes a valve cover 71, a check space 72, a guide sleeve 73, and a valve core 75.

The valve cover 71 constitutes the external appearance of the backflow prevention device 70 as a check valve, and the valve cover 71 is mounted on the water meter case 10 to form the outer shell of the water meter 100 and the check space 72. , is installed in the fixed cavity (14).

The check space 72 may be in communication with the first outflow passage 131 of the outflow channel 13 through the backflow prevention hole 15, and water may flow into the check space to prevent backflow. Water flowing into the outflow channel 13 flows into the check space 72 through the backflow prevention hole 15 and then flows out of the meter case 10.

Both the guide sleeve 73 and the valve core 75 are provided inside the valve cover 71, and the valve core 75 is slidably connected to the guide sleeve 73 to open and close the backflow prevention hole 15.

In one embodiment of the present invention, the valve cover 71 seals the opening of the fixing cavity 14, and the valve cover 71 may be screwed to the water meter case 10. Specifically, the valve cover 71 may include a fixing sleeve 711 and a backflow prevention adjustment member 712.

The fixing sleeve 711 has threads and is screwed to the water meter case 10, and a backflow prevention adjusting member 712 is installed on the fixing sleeve 711, and the fixing sleeve 711 and the backflow prevention adjusting member 712 ) and the water meter case 10 are connected and surround the check space 72.

In one embodiment, the fixing sleeve 711 has openings at both ends so that both ends are open, one end of the fixing sleeve 711 is screwed to the water meter case 10, and a backflow prevention adjustment member is installed at the other end of the fixing sleeve. (712) can be screwed to seal the other end opening of the fixing sleeve (711).

The backflow prevention adjustment member 712 may be coupled to the fixing sleeve 711 and may be provided to reciprocate and be fixed along the extension direction of the fixing sleeve. The backflow prevention adjustment member 712 may include a mounting head 713 and a check shaft 714.

The mounting head 713 is screwed to the inner wall of the fixed sleeve 711 and is movably coupled to the fixed sleeve 711. The check shaft 714 is located in the check space 72 and has one end of the mounting head 713. ) is fixedly connected to The backflow prevention control member 712 is screwed to the fixing sleeve 711 and can control the water output of the water meter 100 by limiting the movement of the valve core 75. By rotating the mounting head 713, the check shaft 714 can reciprocate along the inclined insertion direction of the backflow prevention adjustment member 712 in the check space 72.

In one embodiment, an operating groove 716 may be provided at the end of the mounting head 713 opposite the check shaft 714. The operating groove 716 may preferably be provided to facilitate rotation of the backflow prevention adjustment member 712 with respect to the flow meter case 10 by a special tool used by a meter reader.

In one embodiment, in order to further improve the sealing performance of the water meter 100, a seal ( 76) can be provided.

In one embodiment, a fixing groove 725 may be formed in the upper end of the inner wall of the fixing sleeve 711. The backflow prevention device 70 may further include a guide ring 78 that is received and fixed in the fixing groove 725. The guide ring 78 may function as a stopper to limit the movement of the backflow prevention adjustment member 712 in a direction away from the backflow prevention hole 15. The guide ring 78 is provided in the shape of a ring with a portion cut off, and is inserted into the fixing sleeve 711 while contracted by pressure. After insertion, it returns to its original state within the fixing groove 725 and forms the fixing groove 725. Can be accommodated and fixed within.

The guide sleeve 73 is fixed to the fixing sleeve 711 of the valve cover 71 and divides the check space 72 into a first cavity 721 and a second cavity 723. The second cavity 723 defined by the guide sleeve 73 is formed between the backflow prevention hole 15 and the outflow channel 13 and communicates with the first outflow path 131 through the backflow prevention hole 15. .

In this embodiment, the opening of the first cavity 721 may be smaller than the opening of the second cavity 723, and the guide sleeve 73 and the fixing sleeve 711 may be formed as one piece.

The guide sleeve 73 may include a guide slide 731 and at least one pressure relief hole 732 surrounding the guide slide 731. Both the guide slide 731 and the pressure relief hole 732 communicate with the first cavity 721 and the second cavity 723.

In this embodiment, the guide slide 731 penetrates both ends of the guide sleeve 73 and may be formed parallel to the inclined direction of the check space 72. A check shaft 714 is disposed on one side of the guide slide 731, and at least a portion of the free end of the check shaft 714 may enter or overlap the guide slide 731. An air passage 715 through which fluid passes is formed between the outer circumferential wall of the check shaft 714 and the inner wall of the guide slide 731.

The valve core 75 is located in the check space 72 and is slidably connected to the guide slide 731. That is, the sliding direction of the valve core 75 is parallel to the inclination direction of the check space 72.

The valve core 75 can slide relative to the valve cover 71 along the guide slide 731 in the closed and open positions. When the valve core 75 is in the sealing position as shown in FIG. 15, the valve core 75 seals the backflow prevention hole 15. On the other hand, when the valve core 75 is in the open position as shown in FIG. 14, the valve core 75 is separated from the backflow prevention hole 15 to open the backflow prevention hole 15.

In one embodiment, the valve core 75 may include a connecting shaft 751, a sealing plate 753 connected to one end of the connecting shaft 751, and a core groove 754.

The connecting shaft 751 is slidably disposed on the guide slide 731, and a core groove 754 is recessed at the end of the connecting shaft 751 opposite to the sealing plate 753. In this embodiment, the core Groove 754 may be a tapered groove.

The sealing plate 753 is located in the second cavity 723, and the connecting shaft 751 slides along the guide slide 731 so that the sealing plate 753 seals or opens the check hole 15. Specifically, when the valve core 75 is in the sealing position, the valve core 75 is in a position spaced apart from the adjustment check member 712 and the check shaft 714, and the sealing plate 753 of the valve core 75 ) seals the backflow prevention hole (15). When the valve core 75 is in the open position, the valve core 75 is in a position close to the adjustment check member 712, and the sealing plate 753 of the valve core 75 is separated from the backflow prevention hole 15. This opens the backflow prevention hole (15). The connection shaft 751 of the valve core 75 and the check shaft 714 of the backflow prevention adjustment member 712 may be in contact with each other.

When using the water meter 100, external water flows into the water meter case 10 from the inlet channel 12, then passes through the guide hole in the impeller chamber 21, flows into the measuring unit 20, and flows into the impeller 23. As an impact is applied, the impeller (23) rotates and the quantity can be measured.

Subsequently, the water flowing into the measuring unit 20 flows into the outlet channel 13 through the guide hole of the impeller chamber 21, and when the water flows from the first outlet 131 to the second outlet 134. When the backflow prevention hole 15 is opened, water pushes the valve core 75, and the connecting shaft 751 of the valve core 75 moves along the guide slide 731 until it touches the free end of the check shaft 714. It slides. As shown in FIG. 16, at this time, the backflow prevention hole 15 is in an open state, so the outside of the water meter case 10 is in the order of the backflow prevention hole 15, the check space 72, and the outflow channel 13. Water flows out.

In this process, as the valve core 75 approaches the backflow prevention control member 712, the air in the guide slide 731 is released into a small space between the connecting shaft 751 of the valve core 75 and the inner wall of the valve core 75. Not only can it be discharged through the air passage 715 formed in the gap, but it can also be quickly discharged into the first cavity 721 through the air passage 715 between the check shaft 714 and the inner wall of the guide slide 731. When the air pressure in the first cavity 721 is high, the air inside the first cavity 721 is also discharged into the second cavity 723, which is a larger space, through the pressure relief hole 732. Accordingly, the increased air pressure of the guide slide 731 can be prevented from interfering with the movement of the valve core 75, and the opening speed of the check hole 15 can be increased, thereby improving the measurement accuracy of the water meter 100. It helps to improve.

Meanwhile, since the function of the check shaft 714 is to limit the opening position of the valve core 75 during use, the gap between the check shaft 714 and the inner wall of the guide slide 731 is the connection shaft 751 and the guide slide. It may be larger than the gap between the inner walls of 731, and thus the air channel 715 allows the air guided to the guide slide 731 to be quickly discharged into the first cavity 721.

After the backflow prevention hole 15 is opened, the guide slide 731 is in a negative pressure state because most of the air inside it escapes due to the movement of the valve core 75. The air in the first cavity 721 of the check space 72 quickly enters the guide slide 731 through the air passage 715 between the check shaft 714 and the inner wall of the guide slide 731, and The air in the second cavity 723 quickly enters the guide slide 731 through the pressure relief hole 732, the first cavity 721, and the air passage 715 to connect the valve core 75 to the backflow prevention hole 15. ) is pushed towards. As a result, the backflow prevention hole 15 is sealed and the backflow prevention function is achieved.

In addition, the inclined first outflow passage 131 allows sufficient use of potential energy conversion due to the height difference, where forward water pressure pushes up the valve core 75 by the combined force of its own weight and reverse water flow. is guaranteed to be sufficient, so that the backflow prevention device 70 can operate normally.

Since the check space 72 extends obliquely along the fixed cavity 14, when the valve core 75 moves away from the valve cover 71 along the inclination direction of the check space 72, it passes through the obliquely extended check space. The lightweight valve core (75) slides down smoothly to achieve the check effect.

When the water flow flows in the forward direction to open the valve core 75, the air in the guide slide 731 not only passes through the valve core 75, but also quickly flows into the backflow prevention space 72 through the pressure reduction hole 732. can be discharged. In addition, the air inside the guide slide 731 is maintained and prevented from interfering with the opening movement of the valve core 75, so the valve core 75 is immediately opened during metering of the water meter 100, thereby improving the accuracy of water measurement. improve

Due to the discharge of air from the guide slide 731, the guide slide 731 becomes a negative pressure state, and when the water stops flowing, the air in the check space 72 also flows through the second cavity 723 and the pressure relief hole 732. The air flowing into the first cavity 721 can be quickly guided into the guide slide 731 through the air channel 715. Accordingly, the valve core 75 is pushed toward the backflow prevention hole 15 and seals the backflow prevention hole 15, thereby performing an immediate check function.

In the above-described water meter 100, a core groove 754 is recessed at the end of the connecting shaft 751 facing the sealing plate 753, which is located in the connecting shaft 751 facing the sealing plate 753. By increasing the contact area between the end of the valve and the air, the speed at which the valve core 75 returns for the check function can be further increased.

In addition, the core groove 754 is composed of a tapered hole, which can further increase the contact area between the air and the end of the connecting shaft 751 away from the sealing plate 753.

On the contrary, when water flows in the reverse direction, water flows from the second outflow passage 134 to the check space 72 and a force is applied to the valve core 75 to seal the backflow prevention hole 15. At this time, the air remaining in the check space 72 due to the inflow of water may flow into the first cavity 721 from the second cavity 723 through the pressure relief hole 732. The air in the first cavity 721 continuously flows into the guide slide 731 through the air passage 715 formed between the check shaft 714 and the guide slide 731, and the internal pressure of the guide slide 731 increases. Due to this, the valve core 75 is pushed toward the backflow prevention hole 15 so that the sealing plate 753 seals the backflow prevention hole 15. At this time, the force pushing the valve core 75 by air pressure within the guide slide 731 is in a direction parallel to the reciprocating direction of the valve core 75, so an immediate check response to the backflow of water is possible, and the connection shaft 751 ) and the guide slide (731) can be minimized to minimize durability degradation due to use of the check valve. If only hydraulic pressure acting in a direction oblique to the reciprocating direction of the valve core 75 is applied, there is a possibility that the connecting shaft 751 and guide slide 731 may be worn or the backflow prevention hole 15 may not be properly sealed. In the case of the invention, since the fluid in the guide slide 731 applies force in a direction parallel to the reciprocating direction of the valve core 75, immediate check response and improved durability can be achieved.

In this specification, it is explained that the fluid that flows into the guide slide 731 when water flows in the reverse direction and pushes the valve core 75 toward the backflow prevention hole 15 to seal the backflow prevention hole is air, but the check space ( 72) It is not excluded from the scope of rights that the fluid that flows into the guide slide 731 through the second cavity 723 and the first cavity 721 and pushes the connecting shaft 751 toward the backflow prevention hole 15 is water. No.

Referring to FIGS. 17 and 18 , in the water meter 100 according to an embodiment of the present invention, the operating groove 716 may be formed so that it can be operated using a special tool. The operating groove 716 is preferably formed so as not to accommodate ordinary tools such as flat-blade or cross-head screwdrivers, and when turning the tool by accommodating a tool of a special shape, the backflow prevention adjustment member 712 is connected to the fixing sleeve 711. It can be rotated within to move forward or backward.

As can be seen in FIG. 17, the operating groove 716 may be formed so that the recessed side surface is tapered. The recessed portion of the operating groove 716 may be tapered to have a predetermined central angle. Preferably, the central angle of the recessed portion of the operating groove 716 may be 10°. Accordingly, the tool that is inserted into the operating groove 716 and rotates the operating groove 716 and the backflow prevention adjustment member 712 to move forward or backward has a shape complementary to the operating groove 716, and is tapered toward the end. It can have a losing shape.

The operating groove 716 may be formed by radially connecting a plurality of outwardly convex curved convex portions 716a. A concave portion 716b is formed between the convex portions 716a. The concave portion 716b is formed by meeting the outer convex curves of the adjacent convex portions 716a, and may have a shape with a peak on the inside, but may also be chamfered into a gently curved shape.

In one embodiment, an odd number of the convex portions 716a may be radially connected to form an operating groove 716. Accordingly, the line segment drawn from the outermost part (P) of the convex part (716a) within the operating groove (716) to a part of the opposing convex part (716a) deviates from the center (C) of the backflow prevention adjustment member (712). do. Additionally, a line segment drawn from the outermost portion (P) of one convex portion (716a) to the inner portion (Q) of the opposing concave portion (716b) passes through the center of the backflow prevention adjustment member 712. At this time, the center of the line segment drawn from the outermost portion (P) of the convex portion (716a) to the inner portion (Q) of the opposing concave portion (716b) deviates from the center (C) of the backflow prevention adjustment member 712. When attempting to turn the operating groove 716 by inserting a normal tool such as a flat-blade screwdriver into the operating groove 716, the rotation center of the tool and the center of the operating groove 716 may be misaligned, causing the backflow prevention adjustment member 712 to rotate arbitrarily. This does not allow the tool to spin within the operating groove 716.

In particular, the line drawn from the outermost part P of one convex part 716a to the outermost part of the opposing convex part 716a deviates from the center of the backflow prevention adjustment member 712, and the convex part 716a It is preferable that an odd number of convex portions 716a are formed with a predetermined central angle so that the shape is uniform.

More preferably, the operating groove 716 has five convex portions 716a radially so that the convex portions 716a are formed uniformly while a prime number of the convex portions 716a are formed. They are formed to be connected, and the central angle between the center of the operating groove and the neighboring convex portion 716a may be formed to be 72 degrees.

The convex portion 716a may be formed with a certain curvature and have the shape of an arc with a predetermined central angle. In another embodiment, the curvature from the outermost portion P of one convex portion 716a to the concave portion may be formed differently.

When it is desired to lock or cut off the flow of water in the tap, insert the tool into the operating groove 716 and rotate it to advance the backflow prevention control member 712 toward the check space 72. The check shaft 714 located at one end of the check space may move toward the valve core 75 to limit the movement of the valve core 75. As the valve core 75 moves, one end of the check shaft 714 and the connecting shaft 751 of the valve core 75 may come into contact, so the backflow prevention adjustment member 712 advances toward the check space 72. When fixed, the movement range of the valve core 75 is limited to one end of the check shaft, thereby limiting the movement of the valve core 75 within the check space 72. When the backflow prevention adjustment member 712 advances to a position where the sealing plate 753 of the valve core 75 seals the backflow prevention hole 15, the backflow prevention hole 15 is sealed and locking of the flow path can be achieved. there is.

On the contrary, by inserting the tool into the operating groove 716 and rotating it, the backflow prevention adjustment member 712 is inserted into the backflow prevention adjustment member 712 and the sealing plate 753 of the valve core 75 is connected to the backflow prevention hole 15. When retreating from the position to seal, the sealing plate 753 of the valve core 75 may be spaced apart from the backflow prevention hole 15, thereby unlocking the flow path.

Referring to FIG. 19, a tool 80 for water opening and closing may be provided that is inserted into the operating groove 716 to advance or retract the backflow prevention adjustment member 712. In order to control the degree of opening and closing of the water supply, the water opening/closing tool 80 inserts one end of the water supply opening/closing tool 80 into the operating groove 716 and rotates it to move the backflow prevention control member 712 forward or backward. and, through this, the valve core 75 seals or opens the backflow prevention hole 15. Through the water opening/closing tool 80, the function of preventing backflow of tap water can be maintained depending on the situation, and a meter reader can turn off or supply water through a simple operation. The water opening/closing tool 80 may include a handle 81, a rod 83, and an insertion portion 85.

The handle 81 is an extended part that allows the user to hold the water opening/closing tool 80. In a preferred embodiment, the handle may extend in an axial direction parallel to the center of the insertion portion 85. Depending on the situation, it may be bent or extended in the form of a curve.

The rod 83 extends from the handle 81 toward the insertion portion 85.

The insertion portion 85 is inserted into the operating groove 716, engages with the operating groove 716, and rotates about the center to move the backflow prevention adjustment member 712 forward or backward within the fixing sleeve 711. The insertion portion 85 may be formed to be complementary to the shape in which the operating groove 716 is recessed.

The insertion portion 85 may be formed to be tapered. The side peripheral portion of the insertion portion 85 may be tapered to have a predetermined central angle, preferably 10° corresponding to the central angle of the recessed portion of the operating groove 716.

The insertion portion 85 may be formed by radially connecting a plurality of outwardly convex curved convex portions 85a. A concave portion 85b is formed between the convex portions 85a. The concave portion 85b is formed by meeting the outer convex curves of the adjacent convex portions 85a, and may have a shape with a point on the inside, but may also be chamfered into a gently curved shape.

In one embodiment, an odd number of the convex portions 85a may be radially connected to form the insertion portion 85. Accordingly, a line segment drawn from the outermost portion of one convex portion 85a within the insertion portion 85 to a portion of the opposing convex portion 85a may be spaced a predetermined distance from the center of the insertion portion 85. Additionally, a line segment drawn from the outermost portion of one convex portion 85a to the inner portion of the opposing concave portion 85b passes through the center of the insertion portion 85, and at this time, the opposing concave portion from the outermost portion of the convex portion 85a It can be understood that the center of the line segment drawn to the inner part of the portion 85b may be spaced a predetermined distance from the center of the insertion portion 85.

In particular, the line segment drawn from the outermost part of one convex part 85a to the outermost part of the opposing convex part 85a is spaced apart from the center of the insertion part 85, and an odd number is drawn so that the shape of the convex part 85a is uniform. It is preferable that the two convex portions 85a are formed with a predetermined central angle.

More preferably, the insertion portion 85 has five convex portions 85a radially so that the convex portions 85a are formed uniformly while forming a prime number of convex portions 85a. They may be formed to be connected, and the central angle between the center of the insertion portion 85 and the adjacent convex portion 85a may be 72 degrees.

The convex portion 85a is formed with a certain curvature and may have the shape of an arc with a predetermined central angle. In another embodiment, the curvature from the outermost part of one convex portion 85a to the concave portion may be formed differently.

The above detailed description is illustrative of the present invention. Additionally, the foregoing is intended to illustrate preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, changes or modifications can be made within the scope of the inventive concept disclosed in this specification, a scope equivalent to the written disclosure, and/or within the scope of technology or knowledge in the art. The above-described embodiments illustrate the best state for implementing the technical idea of the present invention, and various changes required for specific application fields and uses of the present invention are also possible. Accordingly, the detailed description of the invention above is not intended to limit the invention to the disclosed embodiments. Additionally, the appended claims should be construed to include other embodiments as well.

100: Water meter
10: Water meter case 11: Seating cavity 12: Inflow channel
13: Outflow channel 14: Fixed cabinet 15: Backflow prevention hole
16: communication part 17: partition wall
20: Measuring part 21: Impeller chamber 23: Impeller
25: First magnetic coupling axis
30: measurement unit cover 31: cover body 310: ridge
312: Accommodation space
32: Cover peripheral wall 34: Mounting groove 36: Locking portion
40: Leader 41: Leader Housing 411: Housing
413: Flange 42: Clamping part 45: Second magnetic coupling axis
50: Water meter cover 51: End cover 512: Mounting opening
52: connecting wall
60: magnetic shield assembly 61: insulating member 611: bottom plate
612: Fixed port 613: Limiting groove 614: Insulating peripheral wall
615: Weight reduction groove 616: Outer peripheral wall
62: Magnetic shielding inner ring 620: Shielding ring 621: Magnetic shielding cover
622: Inner ring port 64: Magnetically shielded outer ring
70: Backflow prevention device
71: Valve cover 711: Fixed sleeve 712: Backflow prevention adjustment member
713: Mounting head 714: Check shaft 715: Air passage
716: Operation home
72: check space 721: first cavity 723: second cavity
73: Guide sleeve 731: Guide slide 732: Pressure relief hole
75: Valve core 751: Connecting shaft 753: Sealing plate
754: Core Home
76: Ceiling 78: Guide ring

Claims (15)

It includes a water meter case having an inflow channel, an outlet channel, and a backflow prevention hole communicating with the outlet channel, and a backflow prevention device for blocking the backflow of fluid in the water meter case,
The backflow prevention device,
A valve cover mounted on the water meter case and forming a check space together with the water meter shell, a guide sleeve fixed to the valve cover to divide the check space into a first cavity and a second cavity, and capable of sliding within the check space. It includes a valve core that extends,
A water meter, wherein the valve core seals the backflow prevention hole in a sealed position and is separated from the backflow prevention hole in an open position. The water meter according to claim 1, wherein the check space is in communication with an outflow channel through the backflow prevention hole, and water flowing into the outflow channel flows into the check space and then flows out of the water meter case. The method of claim 1, wherein the second cavity communicates with the outflow channel, and the guide sleeve includes at least a guide slide penetrating both ends of the guide sleeve, surrounding the guide slide and communicating between the first cavity and the second cavity. Contains one pressure relief hole,
A water meter, characterized in that the valve core slides relative to the valve cover along a guide slide. The method of claim 3, wherein the valve core includes a connecting shaft slidably disposed on the guide slide, and a sealing plate connected to one end of the connecting shaft,
The sealing plate is located in the second cavity, and the connecting shaft slides along a guide slide so that the sealing plate seals or opens the backflow prevention hole. The water meter according to claim 4, wherein a core groove is formed at an end of the connecting shaft in a direction opposite to that of the sealing plate. The water meter according to claim 5, wherein the core groove is a tapered groove. The method of claim 4, wherein the valve cover includes a fixed sleeve coupled to the water meter case, a backflow prevention adjustment member coupled to the fixed sleeve and capable of reciprocating along the extension direction of the fixed sleeve,
A water meter, characterized in that the backflow prevention adjustment member is disposed in a fixed sleeve, and the guide sleeve is fixed to the fixed sleeve. The method of claim 7, wherein both ends of the fixing sleeve are open, one end of the fixing sleeve is coupled to the water meter case, and a backflow prevention adjustment member is coupled to the other end of the fixing sleeve to seal the opening of the other end of the fixing sleeve. A water meter that uses . The water meter according to claim 8, wherein the backflow prevention adjusting member includes a mounting head coupled to the inner surface of the fixing sleeve, and a check shaft with one end connected to the mounting head within the check space. The method of claim 9, wherein at least a portion of the free end of the check shaft enters or overlaps the guide slide,
A water meter, characterized in that an air passage through which fluid passes is formed between the outer circumferential wall of the check shaft and the inner wall of the guide slide. The water meter according to claim 10, wherein an operating groove is formed at an end of the mounting head opposite to the check shaft. The water meter according to claim 10, wherein a seal is provided between the fixing sleeve and the inner wall of the fixing sleeve and between the fixing sleeve and the water meter case. The method of claim 8, wherein a fixing groove is formed at an upper end of the inner wall of the fixing sleeve, and the fixing groove further includes a guide ring for restricting movement of the backflow prevention adjustment member in a direction away from the backflow prevention hole. Featured water meter. The water meter according to claim 1, wherein the opening of the first cavity is smaller than the opening of the second cavity. A backflow prevention device installed in a water meter case having an inflow channel, an outflow channel, and a backflow prevention hole communicating with the outflow channel,
The backflow prevention device,
A valve cover mounted on the water meter case and forming a check space together with the water meter shell, the check space communicating with an outflow channel through the backflow prevention hole, and fixed to the valve cover to define the check space as the first valve in the valve cover. A guide sleeve divided into a cavity and a second cavity communicating with the outlet channel, and a valve core slidingly extending within the check space,
The guide sleeve includes a guide slide penetrating both ends of the guide sleeve, and at least one pressure relief hole surrounding the guide slide and communicating between the first cavity and the second cavity,
The valve core slides relative to the valve cover along the guide slide,
A backflow prevention device, wherein the valve core seals the backflow prevention hole in a sealed position and is separated from the backflow prevention hole in an open position.

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