Adjustable flow switch based on bistable dry reed

Abstract

The utility model provides adjustable flow switch based on bistable dry reed tube, including the casing, the both ends of casing are provided with inlet end and outlet end respectively, the inside of casing is provided with two ends respectively with inlet end and outlet end intercommunication's flow through cavity, the flow through cavity is from the inlet end to the outlet end and presents the circular truncated cone, the inside of flow through cavity is provided with the guide rod through, the outside of guide rod is provided with the piston column of sliding, and the piston column is provided with the magnet ring of coaxial line. The utility model provides adjustable flow switch based on bistable dry reed tube, improves the operation stability of flow switch through the setting of bistable dry reed tube, makes the regulation threshold range of flow switch bigger through the sliding of support block, and the side of casing is provided with the scale line, and the side of support block is provided with the indication arrow, thereby realizes the accurate regulation of dry reed tube position in support block containing groove, and the position regulation of bistable dry reed tube is accurate and quick, convenient and reliable, improves the adaptability of flow switch under different working conditions.

Description

Technical Field

[0001] This utility model relates to the field of flow switch technology, specifically to an adjustable flow switch based on a bistable reed switch. Background Technology

[0002] Flow switches are key components widely used in industrial automation control systems. They are primarily used to detect the flow state of media (such as liquids or gases) in pipelines and trigger a switching signal when the flow rate reaches or falls below a set threshold to achieve functions such as equipment protection, process control, or safety alarms. Traditional flow switches are mainly divided into two categories: mechanical and electronic. Mechanical flow switches are prone to arc oxidation or adhesion of the mechanical contacts under frequent operation, affecting their service life and signal stability. Electronic flow switches, in particular, require external power supply and signal processing circuitry, increasing system complexity and potential failure points. Therefore, flow switches using magnetic sensing technology have gradually gained application. Among them, reed switches, as a type of magnetically controlled switching device, are used for flow detection due to their good sealing performance, long contact life, and lack of external power supply requirements.

[0003] However, existing reed switch-based flow switches have limited adjustment threshold ranges, making it difficult to flexibly adjust the trigger flow according to actual working conditions. They also have high requirements for installation angles and are not very adaptable to different working conditions. This solution addresses these technical problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an adjustable flow switch based on a bistable reed switch. The bistable reed switch improves the operational stability of the flow switch, and the sliding of the support block allows for a wider adjustment threshold range. The side of the housing is equipped with scale markings, and the side of the support block is equipped with an indicator arrow, thereby enabling precise adjustment of the reed switch position in the support block's receiving groove. The bistable reed switch position adjustment is accurate, quick, convenient, and reliable, improving the flow switch's adaptability under different operating conditions.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an adjustable flow switch based on a bistable reed switch, comprising a housing, an inlet end and an outlet end respectively provided at both ends of the housing, a flow cavity provided inside the housing with both ends communicating with the inlet end and the outlet end respectively, the flow cavity being frustoconical from the inlet end to the outlet end, a guide rod being provided through the flow cavity, a piston rod being slidably provided on the outside of the guide rod, and a magnetic ring being coaxially provided on the piston rod;

[0006] A support block is slidably provided on the outer side of the housing along the direction of medium flow. A bistable reed switch is provided on the support block and is magnetically connected to the magnet ring. The bistable reed switch is electrically connected to an external circuit.

[0007] The inlet end and the outlet end are respectively provided with a support sleeve one and a support sleeve two for fixing the guide rod. Both the support sleeve one and the support sleeve two are provided with a plurality of through holes for the medium to pass through. A spring is sleeved on the outside of the guide rod. One end of the spring is connected to the support sleeve two, and the other end of the spring abuts against one side of the piston column. The other side of the piston column is in separable contact with the support sleeve one.

[0008] The side of the housing is provided with a guide groove parallel to the direction of medium flow, and the side of the support block is provided with a guide platform. The guide platform is slidably disposed in the guide groove, and the side of the guide platform is provided with a receiving groove for accommodating the bistable reed switch.

[0009] The side of the housing is provided with scale markings, and the side of the support block is provided with indicator arrows corresponding to the scale markings.

[0010] The side of the support block is provided with an elongated hole parallel to the guide groove, and a fastening screw slides through the elongated hole. The support block is fastened to the housing by the fastening screw.

[0011] The inner side of the inlet end and the inner side of the outlet end are both provided with internal threads. The outer side of the first support sleeve is provided with an external thread that connects to the inlet end, and the outer side of the second support sleeve is provided with an external thread that connects to the outlet end.

[0012] One end of the guide rod is provided with a large end that abuts against the second support sleeve, and the other end of the guide rod is provided with an external thread. The guide rod passes through the second support sleeve and the piston rod in sequence and is connected to the first support sleeve through a nut.

[0013] The piston rod has an annular positioning groove on its side, and the magnet ring is embedded in the annular positioning groove.

[0014] A transition socket is provided on the side of the support block. One end of the transition socket is electrically connected to the bistable reed switch. A sealing gasket is provided between the transition socket and the support block.

[0015] The other end of the transition socket is detachably provided with a junction box, which is electrically connected to an external line and is connected to the transition socket by a long screw.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) The support block is slidably set in the guide groove of the housing. The bistable reed switch that senses the magnetic ring is set in the receiving groove of the support block. The setting of the bistable reed switch improves the operating stability of the flow switch. The sliding of the support block makes the adjustment threshold range of the flow switch larger. The side of the housing is set with scale marks. The side of the support block is set with indicator arrows corresponding to the scale marks. The support block is fastened to the housing by fastening screws that pass through the elongated hole, thereby realizing the precise adjustment of the position of the reed switch in the receiving groove of the support block. The position adjustment of the bistable reed switch is accurate, quick and convenient, and reliable, improving the adaptability of the flow switch under different working conditions.

[0018] (2) A spring is sleeved on the outside of the guide rod. One end of the spring is connected to the second support sleeve, and the other end of the spring abuts against one side of the piston column. The other side of the piston column is in separable contact with the first support sleeve. By setting the spring and adjusting the support block, the flow switch can achieve the combined force of the medium's thrust on the piston column and gravity to reach the flow alarm value sensed by the bistable reed switch at any angle. This avoids the flow switch's dependence on the installation angle and makes the flow switch more adaptable.

[0019] (3) The housing is made of transparent material, which makes it easy to observe and check the working status of the flow switch, thus facilitating the maintenance and upkeep of the flow switch. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of this utility model;

[0021] Figure 2 This is an exploded view of the structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the support block of this utility model;

[0023] Figure 4 This is a schematic diagram of the guide groove of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the scale markings of this utility model;

[0025] Figure 6 This is a schematic diagram of the connection structure between the support block and the shell of this utility model;

[0026] Figure 7 This is a schematic diagram of the piston rod and guide rod of this utility model.

[0027] In the diagram: 1. Housing; 11. Inlet end; 12. Outlet end; 13. Flow chamber; 14. Guide groove; 15. Scale mark; 2. Guide rod; 21. Support sleeve one; 22. Support sleeve two; 23. Spring; 24. Nut; 3. Piston column; 31. Annular positioning groove; 4. Magnet ring; 5. Support block; 51. Guide platform; 52. Receiving groove; 53. Indicating arrow; 54. Elongated hole; 55. Fastening screw; 6. Bistable reed switch; 7. Transition socket; 71. Sealing gasket; 8. Junction box; 9. Long screw. Detailed Implementation

[0028] 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 scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] In one embodiment, see Figures 1-7An adjustable flow switch based on a bistable reed switch includes a housing 1, with an inlet end 11 and an outlet end 12 at both ends of the housing 1. Inside the housing 1, there is a flow cavity 13 with both ends communicating with the inlet end 11 and the outlet end 12 respectively. The flow cavity 13 is frustoconical from the inlet end 11 to the outlet end 12. A guide rod 2 is provided through the flow cavity 13. A piston rod 3 is slidably provided on the outside of the guide rod 2. A magnetic ring 4 is coaxially provided on the piston rod 3.

[0032] Understandably, the internal cross-section of the shell adopts a frustum-shaped design, which can optimize the flow velocity distribution and improve the uniformity of the flow velocity distribution. The inverted cone design can reduce the risk of local turbulence and cavitation.

[0033] Furthermore, a support block 5 is slidably provided on the outer side of the housing 1 along the direction of medium flow. A bistable reed switch 6 is provided on the support block 5 and is magnetically connected to the magnet ring 4. The bistable reed switch 6 is electrically connected to the external circuit. Furthermore, the housing 1 is made of transparent material, especially transparent acrylic material.

[0034] The inlet end 11 and the outlet end 12 are respectively provided with support sleeve 1 21 and support sleeve 22 for fixing the guide rod 2. Support sleeve 1 21 and support sleeve 22 are each provided with a plurality of through holes for medium to pass through. A spring 23 is sleeved on the outside of the guide rod 2. One end of the spring 23 is connected to support sleeve 22, and the other end of the spring 23 abuts against one side of the piston column 3. The other side of the piston column 3 is in separable contact with support sleeve 1 21.

[0035] It is understood that the side of the housing 1 is provided with a guide groove 14 parallel to the direction of medium flow, and the side of the support block 5 is provided with a guide platform 51. The guide platform 51 is slidably disposed in the guide groove 14. The side of the guide platform 51 is provided with a receiving groove 52 for accommodating the bistable reed switch 6. The setting of the guide groove 14 makes it easier and faster for the support block 5 to slide on the outside of the housing 1.

[0036] Furthermore, the side of the housing 1 is provided with scale marks 15, and the side of the support block 5 is provided with an indicator arrow 53 corresponding to the scale marks 15. By setting the scale marks 15 and the indicator arrow 53, the sliding of the support block 5 is made more precise, and the accuracy of the flow switch adjustment is improved.

[0037] The side of the support block 5 is provided with an elongated hole 54 parallel to the guide groove 14. A fastening screw 55 slides through the elongated hole 54, and the support block 5 is fastened to the housing 1 by the fastening screw 55.

[0038] The inner side of the inlet end 11 and the inner side of the outlet end 12 are both provided with internal threads. The outer side of the support sleeve 1 21 is provided with external threads that connect to the inlet end 11, and the outer side of the support sleeve 22 is provided with external threads that connect to the outlet end 12.

[0039] In another embodiment, one end of the guide rod 2 is provided with a large end that abuts against the second support sleeve 22, and the other end of the guide rod 2 is provided with an external thread. The guide rod 2 passes through the second support sleeve 22 and the piston rod 3 in sequence and is connected to the first support sleeve 21 through a nut 24.

[0040] Furthermore, the large end is equipped with a slotted screw structure. The guide rod 2 is connected to the support sleeve 1 21 and the support sleeve 22 through the large end and the nut 24 respectively. The support sleeve 1 21 and the support sleeve 22 are connected to the inlet end 11 and the outlet end 12 of the housing 1 respectively through external threads. The guide rod 2 is easy, quick and safe to install.

[0041] The piston rod 3 has an annular positioning groove 31 on its side, and the magnet ring 4 is embedded in the annular positioning groove 31.

[0042] A transition socket 7 is provided on the side of the support block 5. One end of the transition socket 7 is electrically connected to the bistable reed switch 6. A sealing gasket 71 is provided between the transition socket 7 and the support block 5. The sealing gasket 71 improves the sealing between the transition socket 7 and the support block 5.

[0043] The other end of the transition socket 7 is detachably equipped with a junction box 8, which is electrically connected to the external line. The junction box 8 and the transition socket 7 are connected by a long screw 9, making the connection between the transition socket 7 and the junction box 8 convenient and quick.

[0044] The specific working process of this utility model:

[0045] In use, the flow switch is installed in the pipeline according to the direction of medium flow, and the junction box 8 is connected to the external line. When the medium flows, the medium pressure overcomes the elastic force of the spring 23 and pushes the piston column 3 to slide along the guide rod 2. When it slides to the position of the bistable reed switch 6, the flow switch reaches the set alarm value and the bistable reed switch 6 closes. When the piston column 3 drives the magnet ring 4 to continue sliding to exceed the set alarm value, the bistable reed switch 6 still remains closed (ordinary reed switches will open when the piston exceeds the set point). Thus, the problem of ordinary reed switches opening due to the magnet ring 4 exceeding the range is solved by the bistable reed switch 6, making the flow switch more stable and reliable.

[0046] The bistable reed switch 6 is a bistable magnetic switch consisting of two reeds sealed inside a glass tube and a bias magnet fixedly connected to the outside of the glass tube. The two reeds inside the glass tube are overlapped with a small gap between them. A suitable magnetic field will cause the two reeds to contact. The glass tube is usually filled with nitrogen or some equivalent inert gas. Some reed switches are even made into a vacuum state to improve their high-voltage performance. The bias magnet has only a very small amount of magnetism. The magnetism of the bias magnet is not enough to attract the two reeds together, but it can maintain the state of the two reeds, so that the two reeds are always in an open or closed state without the influence of an external magnetic field. This avoids the problem of flow switch disconnection caused by the magnet ring 4 exceeding the range. It should be noted that the bistable reed switch 6 or bistable magnetic switch is a prior art implementation and will not be described in detail here.

[0047] The support block 5 is slidably disposed in the guide groove 14 of the housing 1. A bistable reed switch 6 that senses the magnetic ring 4 is disposed in the receiving groove 52 of the support block 5. The bistable reed switch 6 improves the operational stability of the flow switch. The sliding of the support block 5 allows for a wider adjustment threshold range of the flow switch. The side of the housing 1 is provided with scale marks 15, and the side of the support block 5 is provided with an indicator arrow 53 corresponding to the scale marks 15. The support block 5 is fastened to the housing 1 by fastening screws 55 that pass through the elongated hole 54, thereby achieving precise adjustment of the position of the reed switch in the receiving groove 52 of the support block 5. The position adjustment of the bistable reed switch 6 is accurate, quick, convenient, and reliable, improving the adaptability of the flow switch under different operating conditions.

[0048] A spring 23 is fitted on the outside of the guide rod 2. One end of the spring 23 is connected to the second support sleeve 22, and the other end of the spring 23 abuts against one side of the piston rod 3. The other side of the piston rod 3 is in separable contact with the first support sleeve 21. Through the setting of the spring 23 and the adjustment of the support block 5, the flow switch can achieve the flow alarm value sensed by the combined force of the medium's thrust on the piston rod 3 and gravity at any angle. The setting of the spring 23 not only provides the reset force of the piston rod 3, but also balances the combined force of the medium pressure and gravity, avoiding the flow switch's dependence on the installation angle, and making the flow switch more adaptable.

[0049] The housing 1 is made of transparent material, which makes it easy to observe and check the working status of the flow switch, thus facilitating the maintenance and upkeep of the flow switch.

[0050] Technical features not described in detail in this solution are based on conventional operations and general understanding of those skilled in the art, and are therefore not elaborated upon here. Technical features not described in this utility model can be implemented using existing technology, and will not be repeated here. Of course, the above description is not intended to limit this utility model, nor is it limited to the examples given above. Any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model should also fall within the protection scope of this utility model.

[0051] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An adjustable flow switch based on a bistable reed switch, comprising a housing (1), wherein an inlet end (11) and an outlet end (12) are respectively provided at both ends of the housing (1), characterized in that, The housing (1) has a flow cavity (13) with its two ends connected to the inlet end (11) and the outlet end (12) respectively. The flow cavity (13) is frustoconical from the inlet end (11) to the outlet end (12). A guide rod (2) is provided through the flow cavity (13). A piston rod (3) is slidably provided on the outside of the guide rod (2). A magnet ring (4) is coaxially provided on the piston rod (3). A support block (5) is slidably provided on the outer side of the housing (1) along the direction of medium flow. A bistable reed switch (6) is provided on the support block (5) and is magnetically connected to the magnet ring (4). The bistable reed switch (6) is electrically connected to the external circuit.

2. The adjustable flow switch based on a bistable reed switch according to claim 1, characterized in that, The inlet end (11) and the outlet end (12) are respectively provided with a support sleeve one (21) and a support sleeve two (22) for fixing the guide rod (2). Both the support sleeve one (21) and the support sleeve two (22) are provided with a plurality of through holes for medium passage. A spring (23) is sleeved on the outside of the guide rod (2). One end of the spring (23) is connected to the support sleeve two (22), and the other end of the spring (23) abuts against one side of the piston column (3). The other side of the piston column (3) is in separable contact with the support sleeve one (21).

3. The adjustable flow switch based on a bistable reed switch according to claim 1, characterized in that, The side of the housing (1) is provided with a guide groove (14) parallel to the direction of medium flow, and the side of the support block (5) is provided with a guide platform (51). The guide platform (51) is slidably disposed in the guide groove (14), and the side of the guide platform (51) is provided with a receiving groove (52) for accommodating the bistable reed switch (6).

4. The adjustable flow switch based on a bistable reed switch according to claim 3, characterized in that, The side of the housing (1) is provided with scale markings (15), and the side of the support block (5) is provided with an indicator arrow (53) corresponding to the scale markings (15).

5. The adjustable flow switch based on a bistable reed switch according to claim 4, characterized in that, The side of the support block (5) is provided with an elongated hole (54) parallel to the guide groove (14), and a fastening screw (55) is slidably inserted in the elongated hole (54). The support block (5) is fastened to the housing (1) by the fastening screw (55).

6. The adjustable flow switch based on a bistable reed switch according to claim 2, characterized in that, The inner side of the inlet end (11) and the inner side of the outlet end (12) are both provided with internal threads. The outer side of the first support sleeve (21) is provided with an external thread that connects to the inlet end (11). The outer side of the second support sleeve (22) is provided with an external thread that connects to the outlet end (12).

7. The adjustable flow switch based on a bistable reed switch according to claim 6, characterized in that, One end of the guide rod (2) is provided with a large end that abuts against the second support sleeve (22), and the other end of the guide rod (2) is provided with an external thread. The guide rod (2) passes through the second support sleeve (22) and the piston rod (3) in sequence and is connected to the first support sleeve (21) through a nut (24).

8. The adjustable flow switch based on a bistable reed switch according to claim 2, characterized in that, The piston rod (3) has an annular positioning groove (31) on its side, and the magnet ring (4) is embedded in the annular positioning groove (31).

9. The adjustable flow switch based on a bistable reed switch according to claim 1, characterized in that, A transition socket (7) is provided on the side of the support block (5). One end of the transition socket (7) is electrically connected to the bistable reed switch (6). A sealing gasket (71) is provided between the transition socket (7) and the support block (5).

10. The adjustable flow switch based on a bistable reed switch according to claim 9, characterized in that, The other end of the transition socket (7) is detachably provided with a junction box (8), which is electrically connected to an external line. The junction box (8) is connected to the transition socket (7) by a long screw (9).

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