Valve control device of electromagnetic water meter

Abstract

The utility model relates to the field of valve control, and provides a valve control device of an electromagnetic water meter, which comprises a one-way valve mounted in a flow guide pipe and a locking assembly mounted at the top of the outer wall of the flow guide pipe, the flow guide pipe is provided with a limiting hole, and the one-way valve is provided with a one-way valve core capable of sliding along the length direction of the flow guide pipe; the locking assembly comprises a cover body, a locking cam, a locking rod and a driving piece, the cover body and the outer wall of the flow guide pipe form a locking space, one end of the locking rod is located in the locking space, the other end of the locking rod extends into the limiting hole to be connected with the one-way valve element and swings with a rotating shaft installed on the cover body as the center, and the driving piece drives the locking cam to rotate. The long portion of the locking cam can abut against the locking rod so as to limit the locking rod to be located at the locking position. The rotation angle of the locking cam is changed through the driving piece so as to limit the maximum swing range of the locking rod, then the slidable range of the valve element, pulled by the locking rod, of the one-way valve is changed, and opening control over the one-way valve is achieved.

Description

Technical Field

[0001] The present application relates to the field of valve control, and in particular to a valve control device for an electromagnetic water meter. Background Art

[0002] At present, electromagnetic water meters are widely used in the field of pipeline metering. Common electromagnetic water meters install the one-way valve in the guide pipe, and the corresponding opening detection structure is also set inside the pipe. In this way, the impact of water flow in the pipe will not only affect the use of the one-way valve, but also affect the opening detection. If the opening detection mechanism is directly set outside the guide pipe, the detection mechanism and the one-way valve are separated by the inner wall of the pipe, which makes it easy to detect the one-way valve inaccurately. Utility Model Content

[0003] In order to accurately control the opening of a one-way valve, the present application provides a valve control device for an electromagnetic water meter.

[0004] The present application provides a valve control device for an electromagnetic water meter, which adopts the following technical solution:

[0005] A valve control device for an electromagnetic water meter comprises a one-way valve installed in a guide tube and a locking assembly installed on the top of the outer wall of the guide tube, wherein the guide tube is provided with a limit hole, the one-way valve has a one-way valve core that can slide along the length direction of the guide tube, the locking assembly comprises a cover body, a locking cam, a locking rod, and a driving member, the cover body and the outer wall of the guide tube form a locking space, one end of the locking rod is located in the locking space, the other end of the locking rod extends into the limit hole and is connected to the one-way valve core, the locking rod swings around a rotating shaft installed on the cover body, the driving member drives the locking cam to rotate, and the long portion of the locking cam can be abutted against the locking rod to limit the locking rod to be in a locking position.

[0006] By adopting the above technical solution, the user installs the one-way valve in the water guide pipe. When in use, the one-way valve core is pushed into the water guide pipe. When there is no external force, the one-way valve core will drive the locking rod to swing from the locked position to the unlocked position. When there is water flow in the water guide pipe, the water flow will impact the one-way valve core and the locking rod to provide resistance, withdraw the one-way valve core outward, and prevent the locking rod from swinging. Therefore, the opening of the one-way valve is difficult to detect at this time, and the one-way valve is also easy to be flushed out of the water guide pipe.

[0007] In this case, the driving member drives the locking cam to rotate. When the locking cam rotates to the point where the long part abuts against the locking rod, the locking cam can directly limit the swing of the locking rod so that the locking rod remains in the locked position, thereby ensuring that the locking rod no longer swings, and then the locking rod limits the position of the one-way valve core to maintain the locked state of the one-way valve. The driving member changes the maximum swing range of the locking rod by changing the rotation angle of the locking cam, thereby changing the slidable range of the one-way valve core pulled by the locking rod, and controlling the opening of the one-way valve.

[0008] Optionally, the short portion of the locking cam may abut against the locking rod to limit the locking rod from swinging to the unlocking position.

[0009] By adopting the above technical solution, when the driving member drives the locking cam, the end of the locking cam abuts against the locking rod to limit the swing range of the locking rod to the unlocking position, that is, the locking cam can limit the swing range of the locking rod to between the locking position and the unlocking position.

[0010] Optionally, the driving member includes a driving motor and a rack, the output shaft of the driving motor is fixedly connected to the first gear, the locking cam is fixedly provided with a gear shaft, the gear shaft extends out of the cover body and is fixedly connected to the second gear, and the first gear and the second gear are both engaged with the rack.

[0011] By adopting the above technical solution, the output shaft of the driving motor rotates to drive the first gear to rotate, the rotating first gear drives the rack to move, the movement of the rack drives the second gear to rotate, and the rotating second gear drives the locking cam to rotate through the gear shaft, thereby changing the position where the locking cam can connect with the locking rod, for example, the long part of the locking cam is against the locking rod.

[0012] Optionally, the valve control device also includes a limit assembly, the limit assembly includes a first limit block and a second limit block, the rack has a limit boss, the limit boss is located in the gap between the first limit block and the second limit block, and the limit boss can contact either the first limit block or the second limit block.

[0013] By adopting the above technical solution, the limit assembly is installed outside the guide tube, and the rack moves under the drive of the driving motor, and the limit boss of the rack will also move accordingly. The first limit block and the second limit block limit the moving space of the limit boss, thereby limiting the movement range of the rack, and further limiting the rotation angle of the locking cam driven by the driving motor.

[0014] Optionally, the limiting boss is provided with a metal piece, and the guide tube is provided with a non-magnetic detection sensor, and the non-magnetic detection sensor generates an induction signal according to the position of the metal piece.

[0015] By adopting the above technical solution, the driving motor drives the rack to move through the first gear, and then the second gear drives the locking cam to rotate. Therefore, the movement distance of the rack corresponds to the rotation angle of the locking cam, and the rotation angle of the locking cam corresponds to the swing amplitude limit of the locking rod. Therefore, the position of the metal part detected by the non-magnetic detection sensor represents the position of the rack. The user can understand the degree of limitation of the current locking cam on the swing amplitude of the locking rod through the induction signal, and then determine the opening limit range of the one-way valve.

[0016] Optionally, the drive motor drives the rack to reciprocate, and the drive motor is a planetary gear reduction motor.

[0017] Optionally, a fixing column is provided on the outer wall of the flow guide tube, and the cover body is connected to the fixing column via a fixing pin.

[0018] By adopting the above technical solution, the cover body is restricted to be connected with the flow guide pipe through the fixing pin, thereby ensuring the airtightness of the locking space in the cover body.

[0019] Optionally, the one-way valve includes a one-way valve housing and a fixing seat, wherein the fixing seat is fixedly connected to an inner wall of the one-way valve housing, and the one-way valve core passes through the fixing seat and is connected to the locking rod.

[0020] By adopting the above technical solution, the one-way valve is installed in the guide tube, the one-way valve shell is abutted against the inner wall of the guide tube, and the fixing seat fixedly connected to the one-way valve shell is relatively fixed relative to the guide tube. The fixing seat has the function of regulating the sliding direction of the one-way valve core, thereby preventing the one-way valve core from tilting in the guide tube.

[0021] Optionally, a plug hole is formed at the small end of the one-way valve core, and the lower end of the locking rod serves as a locking rod insert to be inserted into the plug hole and swing.

[0022] By adopting the above technical solution, the lower end of the locking rod is inserted into the socket, and as the one-way valve core moves, the lower end of the locking rod moves, the lower end of the locking rod slides in the socket, and the locking rod swings around the rotating shaft.

[0023] Optionally, the cover body is further provided with a clamping block located on both sides of the rotating shaft in the locking space; the inner wall of the socket has a first contact surface and a second contact surface relative to each other, and the first contact surface and the second contact surface are respectively in contact with two end surfaces of the locking rod, and the first contact surface and the second contact surface are both set to be convex arc surfaces.

[0024] By adopting the above technical solution, clamping blocks are arranged on both sides of the rotating shaft to limit the position of the rotating shaft, thereby ensuring the stability of the rotating shaft; the first contact surface and the second contact surface are both arranged as arc surfaces, which can ensure that no matter how the locking rod swings, the lower end of the locking rod can always contact the first contact surface and the second contact surface at the same time, and the socket can always clamp the locking rod when the lower end of the locking rod slides, thereby avoiding the situation where the locking rod shakes and trembles in the socket due to the impact of the water flow of the guide pipe, and ensuring that the locking rod can accurately reflect the position of the valve core of the one-way valve.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The driving member changes the maximum swing range of the locking rod by changing the rotation angle of the locking cam, thereby changing the sliding range of the one-way valve core pulled by the locking rod, thereby realizing the opening control of the one-way valve;

[0027] 2. The non-magnetic sensor detects the position of the metal part to understand the position of the limit boss of the rack, the angle of the locking cam pushed by the gear shaft that meshes with the rack through the second gear, and which part of the locking cam (such as the long part, short part or transition part of the locking cam) can contact the locking rod, and then the swing amplitude limit of the locking rod is obtained, and then the most allowable one-way valve spool movement amplitude, that is, the opening range of the one-way valve, is understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the valve control device 100 of the electromagnetic water meter provided by the utility model when the one-way valve is fully closed;

[0029] Figure 2 yes Figure 1 A cross-sectional view of the valve control device when the middle check valve is fully open;

[0030] Figure 3 yes Figure 1 A schematic diagram of the structure of the driving part in the valve control device;

[0031] Figure 4 yes Figure 1 The structural diagram of the valve control device;

[0032] Figure 5 yes Figure 1 The structural diagram of the valve control device;

[0033] Figure 6 yes Figure 1 A cross-sectional view of the middle cover body;

[0034] Figure 7 yes Figure 1 A schematic diagram of the structure of the middle cover body;

[0035] Figure 8 yes Figure 1 Schematic diagram of the structure of the one-way valve.

[0036] Description of reference numerals:

[0037] 100, valve control device; 11, one-way valve; 12, locking assembly; 200, flow guide tube; 201, limit hole; 111, one-way valve housing; 112, one-way valve core; 113, fixed seat; 114, return spring; 1121, jack; 1122, first contact surface; 1123, second contact surface; 121, cover; 202, fixing column; 122, fixing pin; 123, rotating shaft; 124, pressing block; 125, lock Stop rod; 126, locking cam; 1261, long part; 1262, short part; 1263, transition part; 127, driving member; 1271, driving motor; 1272, first gear; 1273, rack; 1274, second gear; 1275, gear shaft; 1276, limiting boss; 1277, metal part; 128, locking space; 203, non-magnetic detection sensor; 204, first limiting block; 205, second limiting block. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of the utility model concept. As part of this specification, some of the drawings of the present disclosure represent structures and devices in the form of block diagrams to avoid making the disclosed principles complicated and difficult to understand. For the sake of clarity, not all features of the actual implementation are necessarily described.

[0040] Unless expressly limited, the terms "a", "an", and "the" are not intended to refer to a singular entity, but rather to include general categories of which specific examples may be used for illustration. Thus, the use of the terms "a" or "an" may mean any number of at least one, including "one", "one or more", "at least one", and "one or more than one". The term "or" means any of the alternatives and any combination of the alternatives, including all alternatives, unless the alternatives are expressly indicated to be mutually exclusive. The phrase "at least one of" when combined with a list of items refers to a single item in the list or any combination of the items in the list. The phrase does not require all of the listed items unless expressly limited to that.

[0041] The present application embodiment discloses a valve control device 100 for an electromagnetic water meter, Figure 1 and Figure 2, including a one-way valve 11 installed in the guide tube 200 and a locking assembly 12 installed on the top of the outer wall of the guide tube 200.

[0042] The flow guide tube 200 is provided with a limit hole 201, the one-way valve 11 has a one-way valve core 112 that can slide left and right along the length direction of the flow guide tube 200, the locking assembly 12 includes a cover 121, a locking cam 126, a locking rod 125 and a driving member 127, and the cover 121 and the outer wall of the flow guide tube 200 form a locking space 128. A rotating shaft 123 is arranged in the cover 121, the upper end of the locking rod 125 is located in the locking space 128, the lower end of the locking rod 125 extends into the limit hole 201 and enters the cavity of the flow guide tube 200 and is movably connected with the right end of the one-way valve core 112, and a rotating hole is arranged in the middle of the locking rod 125, and the locking rod 125 is sleeved with the rotating shaft 123 through the rotating hole, so that the locking rod 125 swings around the rotating shaft 123 installed on the cover 121. The rotation hole of the locking rod 125 and the rotating shaft 123 may be clearance-fitted or may be other fitting methods that ensure swinging (e.g., bearing fitting). A driving member 127 is also installed in the locking space 128. The driving member 127 drives the locking cam 126 to rotate. The long portion 1261 of the locking cam 126 can abut against the locking rod 125 to limit the locking rod 125 to the locking position. The driving member 127 changes the maximum swinging range of the locking rod 125 by changing the rotation angle of the locking cam 126, thereby changing the slidable range of the one-way valve spool 112 pulled by the locking rod 125, thereby realizing the opening control of the one-way valve 11.

[0043] When in use, the driving member 127 drives the locking cam 126 to rotate. When the locking cam 126 rotates to the point where the long portion 1261 abuts against the locking rod 125, the locking cam 126 can directly limit the swing of the locking rod 125 to keep the locking rod 125 in the locked position, thereby ensuring that the locking rod 125 no longer swings, and then limiting the position of the one-way valve core 112 through the locking rod 125, thereby maintaining the locked state of the one-way valve 11.

[0044] (1) Regarding the internal structure of the locking space 128 in the locking assembly 12, the fixing of the rotating shaft 123, and the structure of the locking rod 125

[0045] refer to Figure 2 and Figure 3 The locking space 128 is provided with a locking cam 126, a locking rod 125 and a driving member 127. Figure 7 The inner contour of the locking space 128 is the envelope area of ​​the locking assembly so that the water storage space is as small as possible to reduce scale accumulation and reduce health risks.

[0046] refer to Figure 5The outer wall of the flow guide tube 200 is provided with a fixing column 202, and the cover body 121 is connected to the fixing column 202 through a fixing pin 122; the fixing pin 122 limits the connection between the cover body 121 and the flow guide tube 200, thereby ensuring the airtightness of the locking space 128 in the cover body 121. Figure 7 In the locking space 128, there are clamping blocks 124 located on both sides of the rotating shaft 123. The two clamping blocks 124 clamp the rotating shaft 123 to ensure the stability of the rotating shaft 123 and prevent the rotating shaft 123 from leaving the original position.

[0047] refer to Figure 8 The short portion 1262 of the locking cam 126 can abut against the locking rod 125 to limit the locking rod 125 from swinging to the unlocking position; the transition portion 1263 of the locking cam 126 can also abut against the locking rod 125 to limit the swinging range of the locking rod 125. A connecting hole for the gear shaft 1275 to be inserted is provided at the center of the locking cam 126. The connecting hole is in the shape of a "cross" to ensure that the gear shaft 1275 can fully drive the locking cam 126 to rotate when rotating. As the locking cam 126 rotates, the outer contour of the long portion 1261 of the locking cam 126 is a maximum circumferential surface. When the long portion 1261 contacts the locking rod 125, the position corresponding to the maximum swing amplitude of the locking rod 125 is limited to the locking position, that is, the locking rod 125 cannot swing; the outer contour of the short portion 1262 of the locking cam 126 is a minimum circumferential surface. When the short portion 1262 contacts the locking rod 125, the position corresponding to the maximum swing amplitude of the locking rod 125 is limited to the unlocking position, that is, the locking rod 125 can swing from the locking position to the unlocking position; the outer contour of the transition portion 1263 of the locking cam 126 is a uniform transition from the minimum circumferential surface to the maximum circumferential surface. When the locking rod 125 is always in contact with the locking cam 126, the rotation of the locking cam 126 can uniformly apply pressure to the locking rod 125 to change the maximum swing amplitude of the locking rod 125.

[0048] After the user pushes the one-way valve core 112 into the guide tube 200, the locking rod 125 abuts against the locking cam 126 (refer to Figure 1 ), and then as the driving member 127 changes the angle of the locking cam 126, the profile of the locking cam 126 that abuts against the locking rod 125 changes from Figure 1 The long part 1261, Figure 8 Transition section 1263, arrival Figure 2 The short portion 1262 shown in the figure realizes the state restriction from fully closed to fully opened of the one-way valve 11. For this reason, in the present case, the locking cam 126 can be controlled by the driving member 127 to change the swing amplitude of the locking rod 125, thereby changing the opening range of the one-way valve core 112.

[0049] (2) The driving member 127 drives the locking cam 126 to rotate to change the swing amplitude of the locking lever 125

[0050] refer to Figure 2 and Figure 3 The driving member 127 includes a driving motor 1271 and a rack 1273, and the output shaft of the driving motor 1271 is provided with a first gear 1272; preferably, reference Figure 3 The output shaft of the driving motor 1271 is integrally formed with the first gear 1272, or the output shaft of the driving motor 1271 has a toothed portion meshing with the rack 1273. Figure 3 and Figure 6 The axis of the locking cam 126 is fixedly connected to one end of the gear shaft 1275, and the other end of the gear shaft 1275 extends out of the locking space 128 and is provided with a second gear 1274 after the cover body 121, and the second gear 1274 is also meshed with the rack 1273; preferably, reference Figure 6 The gear shaft 1275 is integrally formed with the second gear 1274. The second gear 1274 is located outside the fixing column 202, and the rack 1273, the second gear 1274 and the first gear 1272 are located in the same vertical plane.

[0051] The output shaft of the driving motor 1271 rotates to drive the first gear 1272 to rotate clockwise or counterclockwise. The clockwise rotating first gear 1272 drives the rack 1273 to move leftward, thereby causing the second gear 1274 and the gear shaft 1275 to rotate clockwise to rotate the locking cam 126 clockwise. The counterclockwise rotating first gear 1272 drives the rack 1273 to move rightward, thereby causing the second gear 1274 and the gear shaft 1275 to rotate counterclockwise to rotate the locking cam 126 counterclockwise. The rotation of the locking cam 126 changes the position where the locking cam 126 can connect with the locking rod 125, for example, the long portion 1261 of the locking cam 126 abuts against the locking rod 125, and the transition portion 1263 of the locking cam 126 abuts against the locking rod 125.

[0052] refer to Figure 4 and Figure 5 The valve control device 100 also includes a limit assembly, which includes a first limit block 204 and a second limit block 205. The first limit block 204 and the second limit block 205 are both L-shaped blocks. The side walls of the horizontal parts of the first limit block 204 and the second limit block 205 are fixedly connected to the outer wall of the guide tube 200, and the vertical parts of the first limit block 204 and the second limit block 205 are both located on the outside of the second gear 1274.

[0053] The rack 1273 has a limiting boss 1276. The first limiting block 204 and the second limiting block 205 are respectively located on both sides of the limiting boss 1276. The limiting boss 1276 is always located in the gap between the first limiting block 204 and the second limiting block 205. The limiting boss 1276 can contact any one of the first limiting block 204 or the second limiting block 205. Usually, the driving motor 1271 drives the rack 1273 to reciprocate, and the driving motor 1271 is a planetary gear reduction motor.

[0054] In actual application, the rack 1273 moves left and right driven by the driving motor 1271, and the limiting boss 1276 of the rack 1273 will also move accordingly, and the first limiting block 204 and the second limiting block 205 limit the moving space of the limiting boss 1276, thereby limiting the movement range of the rack 1273, and further limiting the rotation angle of the locking cam 126 driven by the driving motor 1271.

[0055] For further reference, Figure 5 and Figure 3 The limiting boss 1276 is provided with a metal part 1277 , and the guide tube 200 is fixedly provided with a non-magnetic detection sensor 203 , which is located below the limiting boss 1276 of the rack 1273 , and the non-magnetic detection sensor 203 generates an induction signal according to the position of the metal part 1277 .

[0056] The driving motor 1271 drives the rack 1273 to move through the first gear 1272, and then the second gear 1274 drives the locking cam 126 to rotate. Therefore, the moving distance of the rack 1273 corresponds to the rotation angle of the locking cam 126, and the rotation angle of the locking cam 126 corresponds to the swing amplitude limit of the locking rod 125. Therefore, the position of the metal part 1277 detected by the non-magnetic detection sensor 203 represents the position of the rack 1273. The user can understand the current locking cam 126 The degree of restriction on the swing amplitude of the locking rod 125 is determined by the sensing signal, and then determine the opening limit range of the one-way valve 11. Usually, the non-magnetic detection sensor 203 uses a position detection sensor to detect the position of the metal part 1277.

[0057] (3) The swing of the locking rod 125 drives the one-way valve core 112 to slide to limit the opening of the one-way valve 11

[0058] refer to Figure 1 and Figure 8The one-way valve 11 includes a one-way valve housing 111 and a fixed seat 113. The fixed seat 113 is fixedly connected to the inner wall of the one-way valve housing 111. The one-way valve core 112 passes through the fixed seat 113 and is connected to the locking rod 125. The one-way valve 11 is installed in the guide tube 200. The one-way valve housing 111 abuts against the inner wall of the guide tube 200. The fixed seat 113 fixedly connected to the one-way valve housing 111 is relatively fixed relative to the guide tube 200. The fixed seat 113 has the function of regulating the sliding direction of the one-way valve core 112 to prevent the one-way valve core 112 from tilting in the guide tube 200. A first rubber sealing ring is arranged between the one-way valve housing 111 and the inner wall of the guide tube 200. A second rubber sealing ring is also arranged between the one-way valve core 112 and the one-way valve housing 111. The right end of the one-way valve core 112 is provided with an insertion hole 1121, and the lower end of the locking rod 125 is inserted into the insertion hole 1121 as a locking rod insert to swing. The lower end of the locking rod 125 is inserted into the insertion hole 1121, and as the locking rod 125 swings, the locking rod 125 with the lower end in the insertion hole 1121 drives the one-way valve core 112 to slide left and right, thereby changing the opening of the one-way valve 11. Figure 8 The inner wall of the socket 1121 has a first contact surface 1122 and a second contact surface 1123 which are opposite to each other. The first contact surface 1122 and the second contact surface 1123 are respectively in contact with the two end surfaces of the locking rod 125. The first contact surface 1122 and the second contact surface 1123 are both configured as convex arc surfaces. The first contact surface 1122 and the second contact surface 1123 are both configured as arc surfaces, which also reduce the contact area between the locking rod 125 and the inner wall of the socket 1121, and reduce the friction force. It can also ensure that no matter how the locking rod 125 swings, the lower end of the locking rod 125 can always contact the first contact surface 1122 and the second contact surface 1123 at the same time. The socket 1121 can always clamp the locking rod 125 when the lower end of the locking rod 125 slides, so as to avoid the situation where the locking rod 125 shakes or trembles in the socket 1121 due to the impact of the water flow of the guide tube 200, and ensure that the locking rod 125 can accurately reflect the position of the one-way valve core 112. refer to Figure 1 A return spring 114 is provided between the one-way valve core 112 and the fixed seat 113 to facilitate the return of the one-way valve core 112 when there is no external force.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A valve control device for an electromagnetic water meter, characterized in that: The invention comprises a one-way valve installed in a guide tube and a locking assembly installed on the top of the outer wall of the guide tube, wherein the guide tube is provided with a limit hole, the one-way valve has a one-way valve core which can slide along the length direction of the guide tube, the locking assembly comprises a cover body, a locking cam, a locking rod, and a driving member, the cover body and the outer wall of the guide tube form a locking space, one end of the locking rod is located in the locking space, the other end of the locking rod extends into the limit hole and is connected with the one-way valve core, the locking rod swings around a rotating shaft installed on the cover body, the driving member drives the locking cam to rotate, and the long part of the locking cam can be against the locking rod to limit the locking rod to be in a locking position.

2. The valve control device of the electromagnetic water meter according to claim 1, characterized in that: The short portion of the locking cam abuts against the locking lever at the unlocking position.

3. The valve control device of the electromagnetic water meter according to claim 1, characterized in that: The driving member includes a driving motor and a rack, the output shaft of the driving motor is fixedly connected to the first gear, the locking cam is fixedly provided with a gear shaft, the gear shaft extends out of the cover body and is fixedly connected to the second gear, and the first gear and the second gear are both engaged with the rack.

4. The valve control device of the electromagnetic water meter according to claim 3, characterized in that: The valve control device also includes a limit assembly, which includes a first limit block and a second limit block. The rack has a limit boss, which is located in the gap between the first limit block and the second limit block. The limit boss can contact either the first limit block or the second limit block.

5. The valve control device of the electromagnetic water meter according to claim 4, characterized in that: The limiting boss is provided with a metal piece, and the guide tube is fixedly provided with a non-magnetic detection sensor, and the non-magnetic detection sensor generates an induction signal according to the position of the metal piece.

6. The valve control device of the electromagnetic water meter according to claim 3, characterized in that: The drive motor drives the rack to reciprocate, and the drive motor is a planetary gear reduction motor.

7. The valve control device of the electromagnetic water meter according to claim 1, characterized in that: The outer wall of the flow guide pipe is provided with a fixing column, and the cover body is connected to the fixing column through a fixing pin.

8. The valve control device of the electromagnetic water meter according to claim 1, characterized in that: The one-way valve comprises a one-way valve housing and a fixing seat, wherein the fixing seat is fixedly connected to the inner wall of the one-way valve housing, and the one-way valve core passes through the fixing seat and is connected to the locking rod.

9. The valve control device of the electromagnetic water meter according to claim 1, characterized in that: The small end of the one-way valve core is provided with an insertion hole, and the lower end of the locking rod is used as a locking rod insert to be inserted into the insertion hole and swing.

10. The valve control device of the electromagnetic water meter according to claim 9, characterized in that: The cover body is also provided with a clamping block located on both sides of the rotating shaft in the locking space; the inner wall of the socket has a first contact surface and a second contact surface relative to each other, and the first contact surface and the second contact surface are both set to be convex arc surfaces, the first contact surface contacts with one end surface of the lower end of the locking rod, and the second contact surface contacts with the other end surface of the lower end of the locking rod.

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