Membrane switch

Abstract

The utility model relates to the field of air pressure detection device discloses membrane pressure switch, including the shell, the shell is from left to right and is sequentially equipped with the sheet component and the skin membrane, the sheet component includes from left to right and is sequentially spaced left sheet component, middle sheet component and right sheet component, left sheet component, middle sheet component and the same side end of right sheet component are fixedly connected with the shell, the free end of left sheet component, middle sheet component and right sheet component all are equipped with the contact of round, and the axis of each contact coincides with each other, the skin membrane is connected with the support rod for pushing middle sheet component, the support rod is connected with middle sheet component slidingly, the skin membrane divides the shell inner chamber into left air chamber and right air chamber, left air chamber is equipped with the circuit channel of communication with outside, right air chamber is equipped with the air pipe. The utility model intends to realize the detection of air pressure multi-interval, and has long-term stability.

Description

Technical Field

[0001] This utility model relates to the field of air pressure detection devices, specifically to a diaphragm pressure switch. Background Technology

[0002] In gas self-closing valves, pressure regulators, flow meters, and various smart pipeline terminals, it is necessary to monitor the gas pressure in the pipeline in real time and convert it into an electrical signal. Typically, a diaphragm pressure switch is installed in the gas circuit to ensure the safe and stable operation of the system. The diaphragm pressure switch uses an elastic diaphragm as a pressure-sensitive element. The deformation of the diaphragm triggers a micro-motion mechanism, which in turn changes the on / off state of the internal contacts, thus realizing the detection of gas pressure. Therefore, the reliability, size, and assembly efficiency of the diaphragm pressure switch directly determine the performance and cost of the entire gas safety control device.

[0003] Currently, common diaphragm switches typically consist of a housing, a diaphragm, and an electrical contact mechanism. The housing is internally divided into two chambers by the diaphragm, one of which is connected to the monitoring gas path. When the gas pressure changes, the diaphragm deforms, directly or via a simple push rod, driving an elastic plate to open or close the electrical contacts, thus outputting a switching signal. This structure usually only achieves a single "on" or "off" state, meaning it can only monitor whether the pressure exceeds a preset threshold, making its function relatively simple.

[0004] The existing diaphragm switch technology has significant drawbacks: First, it typically only allows for a single actuation point, failing to differentiate between multiple pressure ranges such as low-pressure standby, medium-pressure normal operation, and overpressure alarm, thus making it difficult to meet the demands of modern equipment for precise pressure monitoring. Second, its sensitivity and accuracy are determined by the inherent deformation characteristics of the spring itself. Multiple components are manufactured separately, and during assembly, on-site calibration or fine-tuning is impossible. The cumulative errors from machining and assembly result in high precision requirements for component manufacturing and make it difficult to guarantee a high yield rate. Utility Model Content

[0005] The present invention aims to provide a diaphragm pressure switch to achieve multi-range air pressure detection and to have long-term stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A diaphragm switch includes a housing. Inside the housing, a spring assembly and a diaphragm are arranged sequentially from left to right. The spring assembly includes a left spring, a middle spring, and a right spring, arranged at intervals from left to right. The ends of the left, middle, and right springs on the same side are fixedly connected to the housing. The free ends of the left, middle, and right springs are all provided with circular contacts, and the axes of the contacts coincide with each other. A support member for pushing the middle spring is connected to the diaphragm. The support member is slidably connected to the middle spring. The diaphragm divides the inner cavity of the housing into a left air chamber and a right air chamber. The left air chamber has a wiring channel communicating with the outside, and the right air chamber has an air inlet pipe.

[0007] The principles and advantages of this scheme are: 1. This diaphragm pressure switch is mainly installed in products such as gas self-closing valves, pressure regulators, and flow meters to monitor gas pressure in real time. When gas is introduced into the right gas chamber, changes in gas pressure cause the diaphragm to expand or contract. The support component moves left and right with the expansion or contraction of the diaphragm, pushing the deformation of the intermediate spring, changing the contact conditions of the intermediate spring contacts, the left spring contacts, and the right spring contacts, thus indicating the gas pressure range. It can detect gas pressure in real time and output signals via signal lines. When used with products such as gas self-closing valves, pressure regulators, and flow meters, it can achieve the effects of low-pressure warning and high-pressure cut-off.

[0008] 2. The diaphragm is installed between the left and right shells, dividing the inner cavity of the shell into a left air chamber and a right air chamber. Both the left and right air chambers are connected to the outside. The diaphragm effectively prevents air leakage between the air chambers, ensuring the accuracy of pressure sensing. The diaphragm is snapped in place by the cooperation of the mounting ring and the mounting groove, which can prevent the edge of the diaphragm from moving. At the same time, the diaphragm is clamped between the left and right shells, which improves the installation firmness of the diaphragm, forms a good seal, and eliminates the need for an additional sealing ring.

[0009] 3. The design employs a support structure with a left spring, a middle spring, and a right spring. Minor deformations of the diaphragm can be precisely transmitted through the support structure and push the middle spring, changing the contact between the middle spring and the left and right springs respectively, thus reflecting changes in air pressure. Utilizing the elasticity of the metal springs and the deformation of the diaphragm, there are no complex mechanical wear parts, resulting in a simple and durable structure that ensures its service life and long-term operational stability.

[0010] 4. Signal lines are provided, which are electrically connected to the left, middle, and right spring contacts respectively. The contact status of the middle spring contact with the left and right spring contacts is indicated by whether the signal lines are connected. When the gas pressure is 0-0.6 kPa, the contact of the middle spring contact is in contact with the contact of the right spring contact; when the gas pressure is 0.6-12 kPa, the contact of the middle spring contact is neither in contact with the contact of the left nor the contact of the right spring contact; when the gas pressure is greater than 12-18 kPa, the contact of the middle spring contact is in contact with the contact of the left spring contact. The result is clearly read.

[0011] 5. When a mechanical structure is used for air pressure monitoring and the air pressure is under normal conditions, the contact of the middle spring is neither in contact with the contact of the left spring nor the contact of the right spring, indicating that the three signal lines are not connected. This means that the diaphragm pressure switch does not consume power at this time. Power is only consumed when the air pressure is under high or low pressure, and the corresponding signal lines are connected. This reduces energy consumption.

[0012] Preferably, as an improvement, the housing includes a left housing and a right housing that are mated together, and the left housing and the right housing are fixed by circumferentially arranged mounting bolts.

[0013] Technical benefits: The above-mentioned configuration and the split shell design facilitate the production of the left shell and the outer shell, and also facilitate the installation and subsequent maintenance of the spring assembly, support components and membrane.

[0014] Preferably, as an improvement, the left housing is provided with a positioning block along the circumferential direction, and the right housing is provided with a positioning groove that cooperates with and connects to the positioning block.

[0015] Technical benefits: The above-mentioned setup facilitates the rapid pre-positioning and alignment of the left and right housings before tightening the mounting bolts, ensuring the installation accuracy of the housings and avoiding problems such as assembly difficulties or poor sealing caused by misalignment.

[0016] Preferably, as an improvement, the left end of the right housing is provided with an annular mounting groove, and the diaphragm is provided with a mounting ring that mates with the mounting groove.

[0017] Technical benefits: With the above-mentioned setup, the diaphragm is engaged through the cooperation of the mounting ring and the mounting groove, which prevents the edge of the diaphragm from moving. At the same time, the diaphragm is clamped between the left and right shells, which improves the installation firmness of the diaphragm, forms a good seal, and eliminates the need for an additional sealing ring. The diaphragm clearly divides the inner cavity of the outer shell into two air chambers, left and right, effectively preventing air leakage between the air chambers and ensuring the accuracy of pressure sensing.

[0018] Preferably, as an improvement, the support member includes a circular support plate and a tapered push rod, the support plate and the push rod are coaxially arranged, the support plate is attached to the diaphragm, and the end of the push rod is slidably connected to a through hole provided on the intermediate spring sheet.

[0019] Technical Effects: This solution employs the aforementioned configuration. The circular support plate increases the contact area with the diaphragm, ensuring uniform force distribution and responsiveness to diaphragm deformation. It also provides support to the diaphragm, preventing it from rupturing due to excessive gas pressure. Damage to the diaphragm would cause a connection between the left and right chambers, leading to gas leakage and a gas safety accident. The conical push rod facilitates insertion into the through-hole on the intermediate spring plate during installation, serving as a guide and positioning element. Furthermore, the conical push rod effectively converts the lateral displacement of the diaphragm into a vertical thrust on the spring plate. When the diaphragm pushes the conical push rod to the left, the inclined surface of the push rod contacts the edge of the through-hole on the intermediate spring plate, resulting in relative sliding. This allows a smaller horizontal displacement to generate a larger vertical displacement, improving the diaphragm pressure switch's sensitivity to pressure changes.

[0020] Preferably, as an improvement, the support member has a slot that penetrates the support plate, with the bottom of the slot located inside the push rod, and the diaphragm has a block that engages with the slot.

[0021] Technical effect: The above-mentioned configuration in this solution, with the interference fit between the card block and the card slot, ensures a stable connection between the membrane and the support.

[0022] Preferably, as an improvement, the housing is further provided with an adjustment assembly, which includes a first set screw, a conical spring and two second set screws. The first set screw and the second set screws are both threadedly connected to the housing. The end of the first set screw is fixedly connected to one end of the conical spring, and the other end of the conical spring is fixedly connected to the intermediate spring piece. The ends of the two second set screws abut against the left spring piece and the right spring piece, respectively.

[0023] Technical benefits: The above-mentioned settings facilitate calibration and fine-tuning after assembly or during use, compensate for errors caused by manufacturing tolerances and material fatigue, and ensure the consistency and long-term stability of air pressure detection accuracy; the conical spring ensures that the intermediate spring plate always has a rightward rebound force.

[0024] Preferably, as an improvement, the left and right springs are provided with adjustment holes that mate with the end of the second set screw.

[0025] Technical benefits: This solution, employing the above-described configuration, provides a clear and reliable point of application for the second set screw. It prevents the end of the second set screw from slipping on the smooth surface of the spring, making the adjustment process more precise and stable, and reducing the likelihood of the adjusted position changing due to vibration.

[0026] Preferably, as an improvement, the left spring, the middle spring, and the right spring are all electrically connected to signal lines, and the signal lines all pass through the housing from the circuit channel.

[0027] Technical effect: With the above configuration, the signal line is uniformly led out of the outer casing, which can be connected to external products and accurately transmit the air pressure monitoring results through the signal line. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0029] Figure 2 This is a structural schematic diagram from another perspective of an embodiment of the present utility model.

[0030] Figure 3 This is a cross-sectional view of an embodiment of the present utility model.

[0031] Figure 4 This is a schematic diagram of the internal structure of the outer shell of this utility model.

[0032] Figure 5 This is a side view of the internal structure of the outer shell of this utility model.

[0033] Figure 6 This is a schematic diagram of the installation structure of the spring clip assembly of this utility model.

[0034] Figure 7 This is a front view of the mounting structure of the spring clip assembly of this utility model.

[0035] Figure 8 This is a schematic diagram of the installation of the diaphragm and support components of this utility model.

[0036] The reference numerals in the accompanying drawings include: outer shell 1, left shell 11, wiring channel 111, positioning block 112, right shell 12, air inlet pipe 121, positioning groove 122, blind hole 123, mounting bolt 13, diaphragm 2, mounting ring 21, locking block 22, support member 3, support plate 31, push rod 32, slot 321, spring assembly 4, right spring 41, middle spring 42, left spring 43, contact point 44, adjusting hole 45, fixing bolt 46, adjusting assembly 5, first set screw 51, conical spring 52, and second set screw 53. Detailed Implementation

[0037] The following detailed description illustrates the specific implementation method: Example The basics are as follows: Figure 1-8 As shown: A diaphragm switch, including a housing 1, such as Figure 1As shown, the outer casing 1 includes a left casing 11 and a right casing 12 that are connected to each other. The left casing 11 and the right casing 12 are fixed by circumferentially arranged mounting bolts 13. In order to ensure the installation accuracy of the left casing 11 and the right casing 12, a positioning block 112 is provided on the left casing 11 along the circumferential direction, and a positioning groove 122 is provided on the right casing 12 that is connected to the positioning block 112. The connection between the positioning block 112 and the positioning groove 122 plays a role in pre-positioning, which facilitates the installation of the mounting bolts 13.

[0038] like Figure 3 As shown, from left to right, the outer casing 1 contains a spring assembly 4, a support 3, and a diaphragm 2. The left end of the right casing 12 has an annular mounting groove. The diaphragm 2 has a mounting ring 21 that mates with the mounting groove. Before connecting the left casing 11 and the right casing 12, the mounting ring 21 of the diaphragm 2 is engaged in the mounting groove. Then, mounting bolts 13 are used to connect the left casing 11 and the right casing 12. At this point, the diaphragm 2 is held between the left casing 11 and the right casing 12, achieving the installation effect of the diaphragm 2. The diaphragm 2 divides the inner cavity of the outer casing 1 into a left air chamber and a right air chamber. The left air chamber has a wiring channel 111 connecting to the outside, and the right air chamber has an air inlet pipe 121, ensuring that both the left and right air chambers are connected to the outside, eliminating any pressure difference.

[0039] like Figure 4 , 5 As shown, the spring assembly 4 includes a left spring 43, a middle spring 42, and a right spring 41 arranged sequentially from left to right. Each of the left spring 43, middle spring 42, and right spring 41 includes a movable end and a fixed end. The top of each spring 43, middle spring 42, and right spring 41 is the fixed end, while the bottom is the movable end. Figure 6 As shown, the fixed ends of the left spring 43, the middle spring 42 and the right spring 41 are fixedly connected to the inner wall of the outer shell 1 by fixing bolts 46, and the fixed ends of the three are fixed inside the outer shell 1 at intervals.

[0040] The movable ends of the left spring 43, the middle spring 42, and the right spring 41 are all provided with circular contacts 44 protruding to both sides, such as Figure 6 As shown, the movable ends of the left spring 43 and the right spring 41 are both bent towards the movable end of the middle spring 42, so that the axes of the contacts 44 of the left spring 43, the middle spring 42 and the right spring 41 coincide. The left spring 43, the middle spring 42 and the right spring 41 are all electrically connected to signal lines. The signal lines pass through the circuit channel 111 and exit the housing 1. The continuity of the signal between the three signal lines reflects the contact status of the contacts 44 of the left spring 43, the middle spring 42 and the right spring 41.

[0041] like Figure 5As shown, the support member 3 includes a circular support plate 31 on the right and a tapered push rod 32 on the left. The support plate 31 and the push rod 32 are coaxially arranged. The support plate 31 is attached to the diaphragm 2, and the end of the push rod 32 passes through the through hole on the intermediate spring piece 42. The support member 3 has a slot 321 that passes through the support plate 31, and its bottom is located inside the push rod 32. The diaphragm 2 has a locking block 22 that is connected to the slot 321. The locking block 22 and the slot 321 are interference fit.

[0042] The housing 1 is also provided with an adjustment assembly 5, which includes a first set screw 51, a conical spring 52 and two second set screws 53. The first set screw 51 and the second set screws 53 are both threaded to the housing 1. The end of the first set screw 51 is fixedly connected to one end of the conical spring 52, and the other end of the conical spring 52 is fixedly connected to the intermediate spring piece 42. The ends of the two second set screws 53 abut against the left spring piece 43 and the right spring piece 41 respectively. The left spring piece 43 and the right spring piece 41 are provided with adjustment holes 45 that are connected to the ends of the second set screws 53.

[0043] During assembly, ensure that the contact 44 of the middle spring 42 is in contact with the contact 44 of the right spring 41, and that the contact 44 of the middle spring 42 is at a certain distance from the contact 44 of the left spring 43.

[0044] This diaphragm pressure switch is typically not used alone, but rather installed in various products such as self-closing valves, pressure regulators, and flow meters, primarily for monitoring gas pressure. In actual use, gas is introduced into the right gas chamber inside the housing 1 through the inlet pipe 121. The gas pressure acts on the diaphragm 2, and changes in gas pressure cause the diaphragm 2 to expand or contract. The support member 3, which is snapped onto the diaphragm 2, moves left and right as the diaphragm 2 expands or contracts. When the gas pressure is 0-0.6 kPa, the diaphragm 2 remains essentially unchanged, and the support 3 does not move. At this time, the contact point 44 of the intermediate spring 42 is always in contact with the contact point 44 of the right spring 41. When the gas pressure increases to 0.6-12 kPa, the diaphragm 2 expands to the left, causing the support 3 to move to the left. At this time, the contact point 44 of the intermediate spring 42 is neither in contact with the contact point 44 of the left spring 43 nor the contact point 44 of the right spring 41. When the gas pressure increases to greater than 12-18 kPa, the diaphragm 2 continues to expand to the left, causing the support 3 to continue moving to the left. At this time, the contact point 44 of the intermediate spring 42 is in contact with the contact point 44 of the left spring 43. When the gas pressure decreases, the diaphragm 2 contracts, causing the support 3 to move to the right. At this time, the contact situation of the contact points 44 of the left spring 43, the intermediate spring 42, and the right spring 41 changes accordingly.

[0045] The contact status of the left spring 43, the middle spring 42 and the right spring 41 is transmitted through three signal lines. The gas pressure is determined to be in the range of 0-0.6KPa, 0.6-12KPa or greater than 12-18KPa based on the on / off status of the signals between the three signal lines.

[0046] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A diaphragm switch, characterized in that: The device includes an outer shell, within which a spring assembly and a diaphragm are arranged sequentially from left to right. The spring assembly includes a left spring, a middle spring, and a right spring, arranged at intervals from left to right. The ends of the left, middle, and right springs on the same side are fixedly connected to the outer shell. The free ends of the left, middle, and right springs are all provided with circular contacts, and the axes of each contact coincide. A support member for pushing the middle spring is connected to the diaphragm. The support member is slidably connected to the middle spring. The diaphragm divides the inner cavity of the outer shell into a left air chamber and a right air chamber. The left air chamber is provided with a wiring channel communicating with the outside, and the right air chamber is provided with an air inlet pipe.

2. The diaphragm switch according to claim 1, characterized in that: The outer casing includes a left shell and a right shell that are connected to each other, and the left shell and the right shell are fixed by circumferentially arranged mounting bolts.

3. The diaphragm switch according to claim 2, characterized in that: The left housing is provided with a positioning block along the circumferential direction, and the right housing is provided with a positioning groove that cooperates with and connects to the positioning block.

4. The diaphragm switch according to claim 2, characterized in that: The left end of the right housing is provided with an annular mounting groove, and the diaphragm is provided with a mounting ring that mates with the mounting groove.

5. The diaphragm switch according to claim 1, characterized in that: The support member includes a circular support plate and a tapered push rod. The support plate and the push rod are coaxially arranged. The support plate is attached to the diaphragm. The end of the push rod is slidably connected to a through hole provided on the intermediate spring sheet.

6. The diaphragm switch according to claim 5, characterized in that: The support member has a slot that penetrates the support plate and the bottom of the slot is located inside the push rod. The diaphragm has a block that cooperates with the slot.

7. The diaphragm switch according to claim 1, characterized in that: The housing is also equipped with an adjustment assembly, which includes a first set screw, a conical spring and two second set screws. The first set screw and the second set screws are both threaded to the housing. The end of the first set screw is fixedly connected to one end of the conical spring, and the other end of the conical spring is fixedly connected to the middle spring piece. The ends of the two second set screws abut against the left spring piece and the right spring piece, respectively.

8. The diaphragm switch according to claim 7, characterized in that: The left and right springs are provided with adjustment holes that mate with the end of the second set screw.

9. The diaphragm switch according to claim 1, characterized in that: The left, middle, and right springs are all electrically connected to signal lines, and the signal lines all pass through the housing from the circuit channel.

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