Anti-high pressure backflow target flow switch

Abstract

This utility model relates to the field of flow switches and discloses a high-pressure backflow-resistant target-type flow switch, including a valve seat assembly. A fixing plate is provided on the top of the valve seat assembly, and a second screw is provided on the fixing plate. The bottom of the fixing plate is fixedly connected to the top of the valve seat assembly by the second screw. Through holes are provided on the front and rear sides of the fixing plate. A first limiting edge is provided on the left side of the inner wall of the through hole, and a second limiting edge is provided on the top of the inner wall of the through hole. A flow rod is provided at the bottom of the valve seat assembly, and a movable plate is provided on the top of the flow rod. In this utility model, by providing the first and second limiting edges within the through holes of the fixing plate, and cooperating with the rotating shafts on both sides of the movable plate, a bidirectional limiting structure is formed, effectively limiting the swing amplitude of the movable plate, avoiding structural deformation and microswitch damage caused by high-pressure water flow impact, and significantly improving the stability and service life of the device under complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of flow switches, and in particular to a target-type flow switch with high-pressure backlash protection. Background Technology

[0002] A target-type flow switch is a flow monitoring device widely used in pipeline systems. Its core function is to convert the mechanical motion of fluid into an electrical signal output. It typically consists of a valve body, a flow rod, and a microswitch. The flow rod senses fluid impact and generates displacement, which in turn triggers the microswitch to actuate, thereby enabling the monitoring and control of the flow state within the pipeline.

[0003] In operation, the device is mounted on a pipe using hollow bolts, with the flow rod extending into the pipe. As fluid flows through, its impact causes the flow rod to oscillate. This mechanical displacement is transmitted via an internal transmission structure to a microswitch, causing its contacts to close or open, thus outputting a corresponding switching signal for subsequent operations such as alarms and pump / valve control. However, existing technologies still have shortcomings under complex operating conditions involving high pressure and high flow rates. Most products lack a complete limiting mechanism or only limit movement in one direction, which can easily lead to excessive displacement of moving parts, structural deformation, or even damage to microswitches, causing signal malfunction or failure. In addition, the regulating components may shift during long-term operation, affecting detection accuracy and the overall reliability of the equipment. To address these issues, a high-pressure backlash-resistant target flow switch is proposed. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a target-type flow switch with anti-high pressure backflow, which aims to solve the problem of the lack of effective limit switches in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-pressure backflow-proof target flow switch, including a valve seat assembly, a fixing plate is provided on the top of the valve seat assembly, a second screw is provided on the fixing plate, the bottom of the fixing plate is fixedly connected to the top of the valve seat assembly by the second screw, and through holes are provided on the front and rear sides of the fixing plate, a first limiting edge is provided on the left side of the inner wall of the through hole, and a second limiting edge is provided on the top of the inner wall of the through hole; The valve seat assembly has a flow rod at its bottom and a movable plate at its top. A third screw is located at the top of the movable plate, which is then fixed to the top of the flow rod. Rotating shafts are fixedly connected to both sides of the movable plate, and these shafts pass through a perforation and contact the inner wall of the perforation.

[0006] As a further description of the above technical solution: a first pad is movably connected to the top of the fixed plate, a micro switch is movably connected to the top of the first pad, a second pad is provided on the top of the micro switch, and a fixing screw is provided on the top of the second pad. The fixing screw passes through the second pad, the micro switch and the first pad in sequence and is threadedly connected to the top of the fixed plate.

[0007] As a further description of the above technical solution: a fourth screw is provided on the top of the movable plate, and the fourth screw penetrates the movable plate and abuts against the contact of the micro switch, and a first nut is threaded on the outer wall of the fourth screw.

[0008] As a further description of the above technical solution: a limiting groove is provided at the top of the movable plate, and an adjusting screw is provided at the bottom of the movable plate. The top of the adjusting screw passes through the limiting groove and the fixed plate and is threaded with a second nut. A spring is sleeved on the outer wall of the adjusting screw, and the spring is located at the bottom of the movable plate.

[0009] As a further description of the above technical solution: the valve seat assembly includes a base plate, the bottom of which is fixedly connected with a hollow bolt, the flow rod passes through the hollow bolt, and the outer wall of the flow rod is fitted with a bellows, which contacts the inner wall of the hollow bolt.

[0010] As a further description of the above technical solution: an installation groove is provided at the connection between the corrugated pipe and the hollow bolt, and a sealing ring is provided on the inner wall of the installation groove.

[0011] As a further description of the above technical solution: the outer wall of the flow rod is provided with mounting screws, and the mounting bolts are threaded through the outer wall of the flow rod.

[0012] As a further description of the above technical solution: the top of the valve seat assembly is provided with a housing, the bottom of the housing is provided with a mounting groove, and the side of the valve seat assembly is provided with a first screw, which passes through the mounting groove and is threadedly connected to the side of the valve seat assembly.

[0013] This utility model has the following beneficial effects: 1. In this utility model, by setting the first and second limiting edges in the through holes of the fixed plate and cooperating with the rotating shafts on both sides of the movable plate, a bidirectional limiting structure is formed, which effectively limits the swing amplitude of the movable plate, avoids structural deformation and micro switch damage caused by high-pressure water flow impact, and significantly improves the stability and service life of the device under complex working conditions.

[0014] 2. In this invention, a limiting groove is provided on the movable plate to guide the movement trajectory of the adjusting screw, preventing it from shifting left or right and ensuring the accuracy and repeatability of sensitivity adjustment. Simultaneously, the combination design of the bellows and sealing ring enhances the sealing performance of the device, effectively preventing fluid leakage and corrosion of internal components, further improving the reliability and safety of the product. Attached Figure Description

[0015] Figure 1 This is a front view of the anti-high pressure backlash target flow switch proposed in this utility model; Figure 2 This is a diagram showing the internal structure of the anti-high-pressure backlash target flow switch proposed in this utility model. Figure 3 This is a side view of the internal structure of the anti-high pressure backflow target flow switch proposed in this utility model; Figure 4 An exploded view of the anti-high-pressure backlash target flow switch proposed in this utility model; Figure 5 This is an exploded side view of the anti-high pressure backlash target flow switch proposed in this utility model; Figure 6 A schematic diagram of the fixing plate for the anti-high pressure backflow target flow switch proposed in this utility model; Figure 7 This is a schematic diagram of the movable plate of the anti-high pressure backlash target flow switch proposed in this utility model; Figure 8 This is a schematic diagram of the fixed plate and movable plate of the anti-high pressure backflow target flow switch proposed in this utility model.

[0016] Legend: 1. Valve seat assembly; 2. Housing; 3. First screw; 4. Flow rod; 5. Fixing plate; 6. Second screw; 7. Movable plate; 8. Third screw; 9. Fourth screw; 10. First nut; 11. Adjusting screw; 12. Second nut; 13. Spring; 14. First pad; 15. Micro switch; 16. Second pad; 17. Fixing screw; 18. Through hole; 181. First limiting edge; 182. Second limiting edge; 19. Rotating shaft; 20. Limiting groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figure 1 This utility model provides an embodiment of a high-pressure backflow-resistant target-type flow switch, including a valve seat assembly 1. A housing 2 is provided on the top of the valve seat assembly 1 to protect a micro switch 15. A mounting groove is provided on the bottom of the housing 2. A first screw 3 is provided on the side of the valve seat assembly 1, passing through the mounting groove and threadedly connected to the side of the valve seat assembly 1. The mounting groove and the first screw 3 are used to fix the housing 2 onto the valve seat assembly 1. A flow rod 4 is provided at the bottom of the valve seat assembly 1 for sensing flow. The valve seat assembly 1 encloses... The system includes a base plate, with a hollow bolt fixedly connected to the bottom of the base plate. The flow rod 4 passes through the hollow bolt, and a bellows is fitted on the outer wall of the flow rod 4, with the bellows contacting the inner wall of the hollow bolt. An installation groove is provided at the connection between the bellows and the hollow bolt, and a sealing ring is provided on the inner wall of the installation groove. The sealing ring is used to seal and prevent liquid from entering the interior and causing damage to the micro switch 15. An installation screw is provided on the outer wall of the flow rod 4, and the thread of the installation screw passes through the outer wall of the flow rod 4. The target plate is installed on the flow rod 4 by installing the installation screw.

[0019] Reference Figure 2 , Figure 3 , Figure 8 A fixing plate 5 is provided on the top of the valve seat assembly 1. A second screw 6 is provided on the fixing plate 5. The bottom of the fixing plate 5 is fixedly connected to the top of the valve seat assembly 1 by the second screw 6. Through holes 18 are provided on the front and rear sides of the fixing plate 5. A first limiting edge 181 is provided on the left side of the inner wall of the through hole 18, and a second limiting edge 182 is provided on the top of the inner wall of the through hole 18, which are used to cooperate with the rotating shaft 19 to limit the movement of the movable plate 7.

[0020] Reference Figure 6 - Figure 8 A movable plate 7 is provided on the top of the flow rod 4, and a third screw 8 is provided on the top of the movable plate 7. The movable plate 7 is fixed to the top of the flow rod 4 by the third screw 8, so that the swing of the flow rod 4 can drive the movable plate 7 to swing. Rotating shafts 19 are fixedly connected to both sides of the movable plate 7. The rotating shafts 19 pass through the through hole 18 and contact the inner wall of the through hole 18.

[0021] Reference Figure 4 - Figure 5A first pad 14 is movably connected to the top of the fixed plate 5. A micro switch 15 is movably connected to the top of the first pad 14. A second pad 16 is provided on the top of the micro switch 15. A fixing screw 17 is provided on the top of the second pad 16. The fixing screw 17 passes through the second pad 16, the micro switch 15, and the first pad 14 in sequence and is threadedly connected to the top of the fixed plate 5. The first pad 14 and the second pad 16 are used to protect the bottom and top of the micro switch 15. A fourth screw 9 is provided on the top of the movable plate 7 and passes through the movable plate. 7 and abut against the contact of the micro switch 15, so that the movable plate 7 can swing to trigger the micro switch 15, thereby converting the mechanical motion of the flow into an electrical signal. The outer wall of the fourth screw 9 is threaded with the first nut 10. The top of the movable plate 7 is provided with a limit groove 20. The bottom of the movable plate 7 is provided with an adjusting screw 11. The top of the adjusting screw 11 passes through the limit groove 20 and the fixed plate 5 and is threaded with the second nut 12. The outer wall of the adjusting screw 11 is fitted with a spring 13, and the spring 13 is located at the bottom of the movable plate 7. The adjusting screw 11 is limited by the limit groove 20.

[0022] Working principle: The device is installed on the flow pipeline by hollow bolts. When there is liquid flowing inside, it will drive the flow rod 4 to swing, which in turn drives the movable plate 7 to swing through the third screw 8. This in turn drives the fourth screw 9 on the movable plate 7 to swing. The fourth screw 9 will abut the contact of the micro switch 15, thereby realizing the monitoring of the flow in the pipeline. The fixed plate 5 has through holes 18 on both sides. The position of the through holes 18 is adapted to the first limit edge 181 and the second limit edge 182 of the rotating shaft 19 on both sides of the movable plate 7 to limit the movement. When one side of the rotating shaft 19 on both sides of the movable plate 7 is in contact with the groove on both sides of the fixed plate 5, the movable plate 7 rotates back and forth and is limited by the first limit edge 181 and the second limit edge 182. The adjusting screw 11 passes through the movable plate 7 and is screwed onto the fixed plate 5 with a threaded fit. A limit groove 20 is made on the movable plate 7. The adjusting screw 11 passes through the limit groove 20, so that the adjusting screw 11 is limited in front, behind and to the left and right during the back and forth movement, stabilizing the running trajectory of the adjusting screw 11.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-pressure backflush-resistant target-type flow switch, comprising a valve seat assembly (1), characterized in that: The valve seat assembly (1) is provided with a fixing plate (5) on the top, and a second screw (6) is provided on the fixing plate (5). The bottom of the fixing plate (5) is fixedly connected to the top of the valve seat assembly (1) by the second screw (6). The fixing plate (5) is provided with through holes (18) on the front and rear sides. The inner wall of the through hole (18) is provided with a first limiting edge (181) on the left side, and a second limiting edge (182) is provided on the top of the inner wall of the through hole (18). The valve seat assembly (1) is provided with a flow rod (4) at the bottom and a movable plate (7) at the top of the flow rod (4). A third screw (8) is provided at the top of the movable plate (7). The movable plate (7) is fixed to the top of the flow rod (4) by the third screw (8). Rotating shafts (19) are fixedly connected to both sides of the movable plate (7). The rotating shafts (19) pass through the through hole (18) and contact the inner wall of the through hole (18).

2. The anti-high-pressure backlash target flow switch according to claim 1, characterized in that: The top of the fixed plate (5) is movably connected to a first pad (14), the top of the first pad (14) is movably connected to a micro switch (15), the top of the micro switch (15) is provided with a second pad (16), the top of the second pad (16) is provided with a fixing screw (17), the fixing screw (17) passes through the second pad (16), the micro switch (15) and the first pad (14) in sequence and is threadedly connected to the top of the fixed plate (5).

3. The anti-high-pressure backlash target flow switch according to claim 2, characterized in that: The top of the movable plate (7) is provided with a fourth screw (9), and the fourth screw (9) penetrates the movable plate (7) and abuts against the contact of the micro switch (15). The outer wall of the fourth screw (9) is threaded with a first nut (10).

4. The anti-high-pressure backlash target flow switch according to claim 1, characterized in that: The top of the movable plate (7) has a limiting groove (20), and the bottom of the movable plate (7) is provided with an adjusting screw (11). The top of the adjusting screw (11) passes through the limiting groove (20) and the fixing plate (5) and is threaded with a second nut (12). The outer wall of the adjusting screw (11) is fitted with a spring (13), and the spring (13) is located at the bottom of the movable plate (7).

5. The anti-high-pressure backlash target flow switch according to claim 1, characterized in that: The valve seat assembly (1) includes a base plate, the bottom of which is fixedly connected with a hollow bolt. The flow rod (4) passes through the hollow bolt, and the outer wall of the flow rod (4) is fitted with a bellows, which contacts the inner wall of the hollow bolt.

6. The anti-high-pressure backlash target flow switch according to claim 5, characterized in that: An installation groove is provided at the connection between the corrugated pipe and the hollow bolt, and a sealing ring is provided on the inner wall of the installation groove.

7. The anti-high-pressure backlash target flow switch according to claim 1, characterized in that: The outer wall of the flow rod (4) is provided with mounting screws, and the mounting bolts are threaded through the outer wall of the flow rod (4).

8. The anti-high-pressure backlash target flow switch according to claim 1, characterized in that: The valve seat assembly (1) has a housing (2) on its top and a mounting groove at its bottom. A first screw (3) is provided on the side of the valve seat assembly (1), and the first screw (3) passes through the mounting groove and is threaded to the side of the valve seat assembly (1).

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