A flow switch

Abstract

This application relates to the field of switch technology, specifically disclosing a flow switch, which includes a main body with a chamber at its bottom; a fixed frame including a fixed plate fixedly connected to the top wall of a corrugated pipe and a support plate connected to the main body, with a micro switch connected to the top wall of the support plate; a corrugated pipe fixedly connected to the top of the main body, with its inner cavity communicating with the chamber, and a plug-in post fixedly connected to the inner top wall of the corrugated pipe, the plug-in post having a hollow structure; a fixing assembly disposed inside the plug-in post, the fixing assembly including a driving component, a fixing block passing through the side wall of the plug-in post, a first spring abutting against the fixing block, and a support plate for the first spring to abut against, the driving component passing through the top wall of the corrugated pipe for driving the fixing block to slide; and a baffle for contacting the fluid and detachably connected to the plug-in post, the baffle having a plug-in groove at its top for a positioning post to insert into, the plug-in groove having a through hole for the fixing block to pass through. This application has the advantage of low maintenance cost.

Description

Technical Field

[0001] This application relates to the field of switching technology, and in particular to a flow switch. Background Technology

[0002] A flow switch is a switch triggered by the fluid flow rate. When the fluid rushes towards the switch's baffle, the baffle swings and, through the connecting structure, actuates the switch contact on the microswitch inside the flow switch, thereby controlling the opening and closing of the microswitch.

[0003] Flow switches are typically used inside fluid systems. The baffle is the component that directly contacts the fluid and senses the flow rate, making it susceptible to fluid impact, corrosion, wear, scaling, or accidental mechanical damage. When the target plate is damaged, deformed, or needs to be replaced with a different specification to suit different operating conditions, the entire flow switch often needs to be replaced, resulting in high maintenance costs. Utility Model Content

[0004] To reduce maintenance costs, this application provides a flow switch.

[0005] The flow switch provided in this application adopts the following technical solution:

[0006] A flow switch, comprising,

[0007] The main body has a cavity at its bottom;

[0008] A fixed frame, comprising a fixed plate fixedly connected to the top wall of the corrugated pipe and a bearing plate connected to the main body, wherein a micro switch is connected to the top wall of the bearing plate;

[0009] A corrugated pipe is fixedly connected to the top of the main body. The inner cavity of the corrugated pipe is connected to the chamber. A plug-in post is fixedly connected to the inner top wall of the corrugated pipe. The plug-in post has a hollow structure.

[0010] A fixing component is disposed inside the plug-in post. The fixing component includes a driving member, a fixing block passing through the side wall of the plug-in post, a first spring abutting against the fixing block, and a support plate for the first spring to abut against. The driving member passes through the top wall of the bellows to drive the fixing block to slide.

[0011] A baffle, which is used to contact the fluid and is detachably connected to the plug-in post, has a plug-in groove on the top for the positioning post to be inserted, and the plug-in groove has a through hole for the fixing block to pass through.

[0012] By adopting the above technical solution, pressing the driving component causes the fixed block to slide, thereby achieving a detachable connection of the baffle. If the baffle corrodes, only the baffle needs to be replaced, eliminating the need to replace the entire switch, effectively reducing maintenance costs. Furthermore, baffles of different sizes can be replaced to adjust the trigger sensitivity, adapting to low to high flow rate scenarios and avoiding the need to select a new switch.

[0013] Optionally, the driving component includes a pressing plate, connecting plates connected to opposite ends of the bottom of the pressing plate, and driving arms connected to both ends of the connecting plates. The driving arms pass through the top wall of the corrugated pipe, and driving grooves for the ends of the driving arms to move are provided on both sides of the fixing block.

[0014] By adopting the above technical solution, when the drive arm moves downward, it abuts against the inner wall of the drive groove, causing the fixed block to move closer to the baffle, so that the fixed block retracts into the insertion post, at which point the baffle can be removed.

[0015] Optionally, a second spring is provided between the bottom of the pressing plate and the top wall of the corrugated pipe.

[0016] By adopting the above technical solution, the second spring can provide an upward elastic force, so that after the baffle is replaced, the drive arm can automatically lift up under the action of the second spring. At this time, under the influence of the first spring, the fixing block can pass through the through hole, realize the automatic reset of the fixing block, and thus fix the baffle on the plug-in post.

[0017] Optionally, the fixing block has a positioning cavity for placing the first spring on the side near the baffle, and the support plate has a positioning post for the first spring to be sleeved on the side near the fixing block.

[0018] By adopting the above technical solution, the first spring can be stably placed between the fixed block and the baffle, thereby ensuring that the first spring is in the preset position and state, and can effectively buffer and reset the fixed block.

[0019] Optionally, the fixing block is connected to two limiting blocks on both sides for abutting against the inner wall of the insertion post.

[0020] By adopting the above technical solution, when the fixing block passes through the through hole, the limiting on both sides can abut against the inner wall of the plug-in post, thereby preventing the fixing block from completely coming out of the plug-in post and the baffle, and ensuring the stability of the connection.

[0021] Optionally, a fixing seat is provided below the fixing plate, a stud threadedly connected to the fixing seat passes through the fixing plate, and a return spring sleeved on the stud is provided between the fixing seat and the fixing plate.

[0022] By adopting the above technical solution, the fixed seat can effectively abut against the return spring. Since the fixed seat is threadedly connected to the stud, the tension of the return spring can be adjusted by adjusting the height of the fixed seat to achieve different trigger sensitivities.

[0023] Optionally, the fixing plate includes a reset plate and a guide plate for triggering a micro switch. The fixing seat is located below the reset plate. The side of the baffle that contacts the water flow is the push surface. The reset plate is located on the side close to the push surface. The end of the baffle away from the main body is bent towards the side away from the push surface.

[0024] By adopting the above technical solution, when fluid passes through the pipeline, the return spring is ensured to be under pressure. Because the length of the spring is shortened under pressure, compressive stress is generated inside it. This compressive stress will limit the expansion of internal defects in the material to a certain extent. Compared with stretching the return spring, compressing the return spring can effectively improve its service life.

[0025] Optionally, a limiting rod is connected to the side wall of the fixed seat, and a limiting hole is provided on the side wall of the fixed bracket for the limiting rod to pass through.

[0026] By adopting the above technical solution, the limiting rod can abut against the inner wall of the limiting hole during the disassembly and installation of the fixing seat, so that the stud will not drive the fixing seat to rotate during the rotation, thereby ensuring that the fixing seat can be dislodged from the stud and ensuring the stability during the disassembly process.

[0027] Optionally, the corrugated pipe, baffle and main body are all made of 316L stainless steel.

[0028] By adopting the above technical solutions, 316L stainless steel enables the flow switch to withstand greater pressure and impact, ensuring that the flow switch maintains structural integrity and stability under harsh working conditions such as high pressure or fluid impact, and extending its service life.

[0029] In summary, this application has the following beneficial effects:

[0030] 1. By setting fixed components, the baffle can be detachably connected. After the baffle wears out after long-term use, there is no need to replace the entire machine body, which effectively reduces maintenance costs.

[0031] 2. By setting a return spring and a return plate on the side close to the push surface, the return spring is compressed when the fluid passes through. Compared with tension, the return spring under compression has significantly lower wear and tear and improves service life. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the flow switch according to an embodiment of this application;

[0033] Figure 2 This is an exploded view of the driver and the main body according to an embodiment of this application;

[0034] Figure 3 This is a cross-sectional view of the main body of an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the structure of the fixing block according to an embodiment of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Main body; 11. Chamber; 2. Fixed frame; 21. Fixed plate; 211. Reset plate; 212. Guide plate; 22. Bearing plate; 221. Limiting hole; 23. Micro switch; 24. Fixed seat; 241. Limiting rod; 25. Stud; 26. Reset spring; 3. Bellows; 31. Insertion post; 4. Fixed assembly; 41. Driving component; 411. Pressing plate; 412. Connecting plate; 413. Driving arm; 42. Fixed block; 421. Driving groove; 422. Positioning cavity; 423. Limiting block; 43. First spring; 44. Support plate; 441. Positioning post; 45. Second spring; 5. Baffle; 51. Insertion groove; 511. Through hole; 52. Push surface. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0038] This application discloses a flow switch. (Refer to...) Figure 1 , Figure 2 The flow switch includes a main body 1 and a fixed frame 2 fixedly connected to the top of the main body 1. The bottom of the main body 1 has a downward-facing chamber 11. A bellows 3, capable of elastic swinging, is fixedly connected to the top of the main body 1. The inner cavity of the bellows 3 communicates with the chamber 11. A plug post 31 is fixedly connected to the inner top wall of the bellows 3. A baffle 5, detachably connected to the plug post 31, is provided inside the chamber 11. The fixed frame includes a fixed plate 21 fixedly connected to the top of the bellows 3 and a support plate 22 connected to the main body 1. A micro switch 23 for cutting off the circuit is connected to the top of the support plate 22. The fixed plate 21 includes a guide plate 212 and a reset plate 211. The guide plate 212 is used to trigger the micro switch 23. When fluid passes through, the baffle 5 is impacted by the fluid, causing the bellows 3 to swing, which in turn causes the fixed plate 21 to pull or press the guide plate 212, thereby switching the circuit.

[0039] In this embodiment, the bellows 3, baffle 5, and main body 1 are all made of 316L stainless steel. Compared to materials such as copper and iron, 316L stainless steel has better strength and corrosion resistance, enabling the flow switch to withstand greater pressure and impact, ensuring that the flow switch maintains structural integrity and stability under harsh conditions such as high pressure or fluid impact, and extending its service life.

[0040] Reference Figure 1 A fixing seat 24 is provided below the reset plate 211. A stud 25, which is threadedly connected to the fixing seat 24, passes through the reset plate 211. The stud 25 extends downward from the top of the reset plate 211. A reset spring 26, sleeved on the stud 25, is provided between the fixing seat 24 and the reset plate 211. The reset spring 26, together with the fixing seat 24, enables the bellows 3 to automatically return to its original position, ensuring that the micro switch 23 is not triggered when there is no water flow.

[0041] Reference Figure 1 The side of the baffle 5 that contacts the water flow is the push surface 52, and the reset plate 211 is located near the push surface 52. When the fluid impacts the baffle 5, the baffle 5 swings, and the reset plate 211, located near the push surface 52, keeps the reset spring 26 under pressure for a long time. Compared to placing the reset plate 211 away from the push surface 52, which would put the reset spring 26 in tension, the reset spring 26 generates compressive stress during compression. This compressive stress can, to some extent, limit the expansion of internal defects in the material, such as cracks and voids, thereby effectively improving the service life of the reset spring 26 and enhancing the durability of the fluid switch.

[0042] Reference Figure 1 A limiting rod 241 is connected to the side wall of the fixed base 24, and a limiting hole 221 is provided on the side wall of the fixed bracket for the limiting rod 241 to pass through. The limiting rod 241 can abut against the inner wall of the limiting hole 221, so that the fixed base 24 will not rotate around the stud 25 during the rotation of the stud 25, thereby ensuring that the connection between the fixed base 24 and the stud 25 can be effectively established or disengaged. The limiting hole 221 is vertically arranged along the height direction of the fixed bracket. When the compression degree of the return spring 26 is adjusted by adjusting the height of the fixed base 24, the limiting rod 241 can move along the limiting hole 221, so that it can abut against the inner wall of the limiting hole 221 at various heights.

[0043] Reference Figure 2 , Figure 3 The top wall of the baffle 5 has a insertion groove 51 for inserting the insertion post 31. The insertion post 31 is a hollow structure and has a fixing component 4 inside. The fixing component 4 includes a driving member 41 passing through the top wall of the bellows 3, a fixing block 42 passing through the insertion post 31, a support plate 44 fixedly connected to the inner wall of the insertion post 31, and a first spring 43 disposed between the support plate 44 and the fixing block 42. The insertion groove 51 has a through hole 511 for the fixing block 42 to pass through. When the baffle 5 wears down and the sensitivity cannot meet the requirements, pressing the driving member 41 causes the fixing block 42 to retract inward. At this time, the fixing block 42 will not abut against the inner wall of the through hole 511, so that the baffle 5 can be removed from the insertion post 31 for replacement.

[0044] Reference Figure 2 , Figure 3 and Figure 4 The driving component 41 includes a pressing plate 411, connecting plates 412 connected to opposite sides of the bottom of the pressing plate 411, and driving arms 413 connected to both ends of the connecting plates 412. The fixing block 42 has driving grooves 421 on both sides for the ends of the driving arms 413 to move. The bottom wall of the driving grooves 421 is inclined. When the driving component 41 is pressed, the driving arms 413 move downwards, and the ends of the driving arms 413 slide along the bottom wall of the driving grooves 421, thereby generating a pushing force on the fixing block 42. The first spring 43 is compressed, causing the fixing block 42 to retract into the insertion post 31.

[0045] Reference Figure 2 , Figure 3 A second spring 45 is provided at the bottom of the pressing plate 411, with its two ends abutting against the bottom wall of the pressing plate 411 and the top wall of the bellows 3, respectively. When the driving member 41 is pressed, the second spring 45 is compressed. After the new baffle 5 is installed, the driving member 41 is released, and the compressed second spring 45 provides an upward force, causing the driving arm 413 to lift upward. At this time, under the influence of the compressed first spring 43, the fixing block 42 can enter the through hole 511 and abut against the inner wall of the through hole 511, thereby fixing the baffle 5 to the plug post 31.

[0046] Reference Figure 4 The fixing block 42 has a positioning cavity 422 for placing the first spring 43 on the side near the baffle 5, and the support plate 44 has a positioning post 441 for the first spring 43 to be sleeved on the side near the fixing block 42. The positioning cavity 422 and the positioning post 441 cooperate to ensure the stable placement of the first spring 43 and ensure that the first spring 43 plays an effective reset role.

[0047] Reference Figure 4 The fixing block 42 has limiting blocks 423 on both sides for abutting against the inner wall of the insertion post 31. When the fixing block 42 is inserted into the through hole 511, the limiting blocks 423 on both sides can abut against the inner wall of the insertion post 31, thereby preventing the fixing block 42 from completely coming out of the through hole 511 and ensuring the stability of the connection.

[0048] The implementation principle of the flow switch in this embodiment is as follows: When replacing the baffle 5, press the driving member 41, and the end of the driving arm 413 moves along the driving groove 421, thereby pushing the fixing block 42 inward so that the fixing block 42 no longer abuts against the inner wall of the through hole 511. At this time, the baffle 5 can be removed for replacement. After replacement, release the driving member 41. Under the action of the second spring 45, the driving member 41 moves upward, causing the driving arm 413 to rise. The first spring 43 pushes the fixing block 42 to re-insert into the through hole 511, thereby completing the fixing.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flow switch, characterized in that, include: The main body (1) has a cavity (11) at its bottom. The fixed frame (2) includes a fixed plate (21) fixedly connected to the top wall of the corrugated pipe (3) and a bearing plate (22) connected to the main body (1). A micro switch (23) is connected to the top wall of the bearing plate (22). A corrugated pipe (3) is fixedly connected to the top of the main body (1). The inner cavity of the corrugated pipe (3) is connected to the chamber (11). A plug-in post (31) is fixedly connected to the top wall of the corrugated pipe (3). The plug-in post (31) is a hollow structure. The fixing component (4) is disposed inside the plug post (31). The fixing component (4) includes a driving member (41), a fixing block (42) passing through the side wall of the plug post (31), a first spring (43) abutting against the fixing block (42), and a support plate (44) for the first spring (43) to abut against. The driving member (41) passes through the top wall of the bellows (3) to drive the fixing block (42) to slide. A baffle (5) is used to contact the fluid and is detachably connected to the plug post (31). The top of the baffle (5) is provided with a plug groove (51) for the plug post (31) to be inserted. The plug groove (51) is provided with a through hole (511) for the fixing block (42) to pass through.

2. The flow switch according to claim 1, characterized in that: The driving component (41) includes a pressing plate (411), a connecting plate (412) connected to the two opposite ends of the bottom of the pressing plate (411), and a driving arm (413) connected to both ends of the connecting plate (412). The driving arm (413) passes through the top wall of the bellows (3). The fixing block (42) has driving grooves (421) on both sides for the end of the driving arm (413) to move.

3. The flow switch according to claim 2, characterized in that: A second spring (45) is provided between the bottom of the pressing plate (411) and the top wall of the corrugated pipe (3).

4. The flow switch according to claim 1, characterized in that: The fixing block (42) has a positioning cavity (422) for placing the first spring (43) on the side near the baffle (5), and the support plate (44) has a positioning post (441) for the first spring (43) to be sleeved on the side near the fixing block (42).

5. The flow switch according to claim 1, characterized in that: The fixing block (42) has limiting blocks (423) on both sides for abutting against the inner wall of the plug-in post (31).

6. The flow switch according to claim 1, characterized in that: A fixing seat (24) is provided below the fixing plate (21). A stud (25) is threaded through the fixing plate (21) and connected to the fixing seat (24). A return spring (26) sleeved on the stud (25) is provided between the fixing seat (24) and the fixing plate (21).

7. The flow switch according to claim 6, characterized in that: The fixing plate (21) includes a reset plate (211) and a guide plate (212) for triggering the micro switch (23). The fixing seat (24) is located below the reset plate (211). The side of the baffle (5) that is in contact with the water flow is the push surface (52). The reset plate (211) is located on the side close to the push surface (52). The baffle (5) is bent away from the main body at one end towards the side away from the push surface (52).

8. The flow switch according to claim 6, characterized in that: The side wall of the fixed base (24) is connected to a limiting rod (241), and the side wall of the bearing plate (22) is provided with a limiting hole (221) for the limiting rod (241) to pass through.

9. The flow switch according to claim 1, characterized in that: The corrugated pipe (3), baffle (5) and main body (1) are all made of stainless steel 316L.

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