Directly-adjusted explosion-proof pressure switch

Abstract

The utility model relates to fire fighting equipment technical field especially a kind of direct-regulation type explosion-proof pressure switch, including box body, microswitch and wiring terminal row being arranged in box body, and transmission mechanism being arranged on box body and being matched with microswitch, the transmission mechanism is mainly by connecting base, diaphragm, top rod and adjusting component constitute, by directly rotating gland can linearly change the pre-compression amount of spring, to realize the accurate, stepless regulation of action pressure, by the utility model can realize stepless regulation to pressure switch action pressure, not only greatly simplify the adjusting operation steps, also make debugging and maintenance more convenient and efficient.

Description

Technical Field

[0001] This utility model relates to the field of fire protection equipment technology, specifically to a direct-adjustable explosion-proof pressure switch. Background Technology

[0002] In the field of fire control, pressure switches are a key component used to monitor pressure changes in automatic sprinkler systems, water mist systems, or foam spray systems, converting pressure signals into electrical signals to trigger alarms, linkage controls, or start equipment such as water pumps. Traditional pressure switches have several limitations. For example, single microswitch designs only support single-loop output, failing to simultaneously meet the dual requirements of alarm and linkage control; they lack local signal display functionality, making it difficult for on-site operators to intuitively judge the switch status; their fixed and non-adjustable operating pressure limits their application in high-pressure scenarios such as alarm valves for large storage tanks; furthermore, most traditional pressure switches do not employ explosion-proof designs, failing to meet the safety requirements of hazardous environments such as petrochemical, shipbuilding, metallurgy, and nuclear power plants. To address the aforementioned issues, existing technologies, such as the patent with publication number CN206451652U, disclose an explosion-proof pressure switch. This switch employs a dual microswitch structure with adjustable push rod displacement. A pressure source overcomes the spring force to push the push rod to close the microswitch. It has a cylindrical shape and its main components include an indicator light, a cap, a housing, dual microswitches, a push rod, a large-head bolt, an adjusting screw, a spring, an intermediate body, a transmission head, a diaphragm, and a water inlet connector. However, the applicant's analysis reveals that this existing technology still has some shortcomings. For example, its pressure adjustment structure is complex, with numerous components such as the large-head bolt, adjusting screw, and intermediate body. This not only makes assembly and debugging cumbersome and increases maintenance costs, but also requires the push rod displacement adjustment to be coordinated by the adjusting screw and the large-head bolt, demanding high precision control. Furthermore, it is prone to loosening or wear after long-term use. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a direct-adjustment explosion-proof pressure switch, which can realize stepless adjustment of the pressure switch action pressure, which not only greatly simplifies the adjustment operation steps, but also makes debugging and maintenance more convenient and efficient.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a direct-adjustment explosion-proof pressure switch, comprising a box-shaped body, a micro switch and a terminal block disposed within the box-shaped body, and a transmission mechanism disposed on the box-shaped body and cooperating with the micro switch. The transmission mechanism includes: a connecting base, the first end of which is fixedly connected to the box-shaped body and partially extends into the box-shaped body, and the connecting base has a flow channel inside; a diaphragm disposed within the flow channel of the connecting base; a push rod movably disposed between the diaphragm and the micro switch, the push rod including a limiting head and a fixing rod; and an adjusting assembly including a connecting cover, a spring, and a pressure cover. One end of the connecting cover is fixedly connected to the first end of the connecting base, and the other end is threadedly connected to the pressure cover. Both the connecting cover and the limiting head abut against the diaphragm, thus closing the flow channel. The fixing rod passes sequentially through the connecting cover and the pressure cover, and the spring is sleeved on the fixing rod and pressed between the limiting head and the pressure cover. The fixing rod partially extends to the pressure cover and abuts against the micro switch.

[0005] Preferably, the adjustment assembly further includes a pressure plate, which is detachably installed in the box-shaped body and presses against the outer end face of the pressure cover.

[0006] Preferably, the center of the connecting cover has a through hole for the fixing rod to pass through, and a limiting ring is provided in the through hole to block the limiting head.

[0007] Preferably, the pressure cap has a cap hole that slides to match the outer diameter of the fixing rod.

[0008] Preferably, the diaphragm is made of silicone rubber.

[0009] Preferably, the flow channel of the connecting base includes a first confluence section, a second confluence section, and a connecting section connected sequentially from the outside to the inside; the inner diameter of the first confluence section is larger than the inner diameter of the second confluence section, the inner diameter of the connecting section is larger than the inner diameter of the second confluence section and is adapted to the outer diameter of the diaphragm; the connecting cover is disposed inside the connecting section.

[0010] Preferably, the box-shaped body is provided with a cable outlet and a mounting port; the connecting base is located at the mounting port and is threadedly connected to the box-shaped body.

[0011] Preferably, the inner side of the box-shaped body is provided with a number of protrusions for mounting microswitches and terminal blocks.

[0012] Preferably, the terminal block is installed in the middle of the box-shaped body, dividing the internal cavity of the box-shaped body into a left chamber and a right chamber, and the micro switch and the transmission mechanism are both arranged corresponding to the left chamber.

[0013] Preferably, the tail end of the connecting base is provided with an external threaded protective cap.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: Compared with the complex mechanism in the prior art that uses the coordinated action of the adjusting screw and the big end bolt to indirectly change the displacement of the top rod to achieve pressure regulation, this application adopts an integrated adjusting component. The pre-compression of the spring can be changed linearly and accurately by directly rotating the pressure cap, thereby realizing stepless adjustment of the pressure switch action pressure. This adjustment mechanism eliminates the intermediate transmission and locking links, significantly reduces the number of parts, and makes the structure more compact. It not only greatly simplifies the adjustment operation steps and makes debugging and maintenance more convenient and efficient, but also fundamentally avoids the backlash, loosening and wear problems that may occur in the linkage of multiple parts, and significantly improves the consistency of adjustment accuracy and the reliability of long-term operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the axial cross-section of the inner side of the explosion-proof pressure switch with connecting base of this utility model; Figure 2 This is a schematic diagram of the explosion-proof pressure switch structure of this utility model; Figure 3 For the present utility model Figure 1 A schematic diagram of the structure at point A in the middle.

[0016] In the diagram: 1. Wiring housing, 2. Connecting base, 3. Diaphragm, 4. Top rod, 5. Connecting cover, 6. Spring, 7. Pressure cover, 8. Pressure plate, 9. Micro switch, 10. Terminal block, 11. Dustproof inner plug, 12. External thread protective cap, 13. Wiring housing cover, 21. First busbar section, 22. Second busbar section, 23. Connecting section, 51. Limiting ring. Detailed Implementation

[0017] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice this utility model. Although this utility model has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of this utility model.

[0018] This application aims to provide an explosion-proof pressure switch that is more convenient and efficient to debug and maintain. It can convert the system's pressure signal into an electrical signal and transmit it to the fire control center to automatically start water pumps or various electrical equipment to achieve purposes such as water spraying and alarm.

[0019] See Figure 1-3In one embodiment of this utility model, a direct-adjustable explosion-proof pressure switch includes: a box-shaped body, a micro switch 9 and a terminal block 10 disposed within the box-shaped body, and a transmission mechanism disposed on the box-shaped body and extending into the box-shaped body to contact the micro switch 9. The micro switch 9 and the terminal block 10 are connected by a connecting wire, and the terminal block 10 is connected to the fire control center by a connecting wire. The box-shaped body is installed on the alarm valve assembly of the automatic sprinkler system through the transmission mechanism. When the alarm valve assembly is in working condition, the transmission mechanism can convert the system pressure signal into an electrical signal and transmit it to the fire control center, thereby automatically starting the water pump or various electrical equipment.

[0020] The box-shaped body is a structure with a closed cavity, consisting of a wiring housing 1, a wiring housing cover 13, and a sealing ring. The wiring housing cover 13 is fixed to the wiring housing 1 with screws, and the sealing ring is located between the wiring housing 1 and the wiring housing cover 13 to ensure the sealing of the box-shaped body and meet explosion-proof requirements. The wiring housing 1 has a wire outlet and an installation port. At the factory, the wire outlet is equipped with a dustproof inner plug 11 to seal the box-shaped body and prevent dust or foreign objects from entering. The wiring housing 1 has several irregular protrusions inside, which provide installation points for the micro switch 9 and the terminal block 10 to ensure stable fixation of the components. The terminal block 10 is installed in the middle of the wiring housing 1, dividing the internal cavity of the wiring housing 1 into a left chamber and a right chamber. The micro switch 9 and the transmission mechanism are respectively set in the left chamber, while the right chamber is used to accommodate the connecting wire. This layout makes the internal space of the box-shaped body more rationally allocated, which is convenient for installation and maintenance.

[0021] The transmission mechanism includes a connecting base 2, a diaphragm 3, a push rod 4, and an adjustment component; the connecting base 2 is a tubular structure with a flow channel and a hexagonal outer periphery for easy installation with tools; the first end of the connecting base 2 is installed at the mounting port of the wiring housing 1 by means of a threaded connection, and the first end of the connecting base 2 extends into the wiring housing 1.

[0022] The flow channel of the connecting base 2 is composed of a first confluence section 21, a second confluence section 22, and a connecting section 23 arranged sequentially from the outside to the inside. The inner diameter of the connecting section 23 is also larger than the inner diameter of the second confluence section 22, so that a step is formed at the junction of the second confluence section 22 and the connecting section 23. The diaphragm 3 is disposed inside the connecting section 23 and located at the step. At the same time, the outer diameter of the diaphragm 3 is adapted to the inner diameter of the connecting section 23. The arrangement of the diaphragm 3 can completely isolate the second confluence section 22 from the connecting section 23, achieving the purpose of sealing. In practice, the diaphragm 3 is made of silicone rubber, which gives the diaphragm 3 good elasticity and pressure resistance. Furthermore, the inner diameter of the first confluence section 21 is larger than the inner diameter of the second confluence section 22. This design increases the water pressure in the second confluence section 22 under the condition that the water flow remains constant, thereby improving the sensitivity of the pressure switch. The tail end of the connecting base 2 is provided with an external threaded protective cap 12, which provides protection before the pressure switch is used and reduces impact damage.

[0023] The top rod 4 is located inside the connecting section 23 and is movably positioned between the diaphragm 3 and the micro switch 9 via an adjusting component. The top rod 4 is a T-shaped structure composed of a limiting head and a fixing rod. The limiting head abuts against the diaphragm 3, while the fixing rod contacts the micro switch 9. When the water pressure in the automatic sprinkler system reaches the diaphragm 3 inside the connecting base 2, the water pressure pushes the diaphragm 3, which in turn pushes the top rod 4 upward, causing the fixing rod of the top rod 4 to trigger the micro switch 9 to close. After the micro switch 9 closes, the electrical signal is transmitted to the fire control center through the connecting line.

[0024] The adjustment assembly includes a connecting cover 5, a spring 6, a pressure cover 7, and a pressure plate 8. The connecting cover 5 is coaxially fixed to the first end of the connecting base 2 via a threaded connection. One end of the connecting cover 5 extends into the connecting section 23 and presses against the diaphragm 3 to fix the position of the diaphragm 3. Furthermore, the connecting cover 5 has a through hole in its center for the fixed rod to pass through. The through hole has a limiting ring 51 with an inner diameter larger than the limiting head to prevent the top rod 4 from slipping off. The pressure cover 7 has a T-shaped structure with a cover hole in its center whose inner diameter loosely matches the outer diameter of the fixed rod. The fixed rod slides through this cover hole. The spring 6 is located inside the connecting cover 5 and is sleeved on the fixed rod. After assembly, the spring 6 is pressed between the limiting head of the top rod 4 and the pressure cover 7. By screwing the pressure cover 7 in or out, the compression degree of the spring 6 can be adjusted, thereby changing the water pressure required to push the top rod 4 and realizing quick adjustment of the water pressure for the pressure switch to start. The pressure plate 8 is detachably mounted on the protrusion inside the wiring housing 1 by screws. At the same time, the pressure plate 8 and the pressure cover 7 are kept in pressure contact. In this embodiment, the pressure plate 8 is a redundant design. By limiting the pressure cover 7, it is possible to prevent the pressure cover 7 from becoming loose after adjustment.

[0025] When the automatic sprinkler system is working, the water pressure of the alarm valve assembly is transmitted to the diaphragm 3 through the flow channel of the connecting base 2. When the water pressure reaches the set value, the diaphragm 3 pushes the push rod 4 to move upward against the resistance of the spring 6. The fixing rod of the push rod 4 triggers the micro switch 9 to close. The electrical signal generated by the micro switch 9 is transmitted to the fire control center through the terminal block 10 and the connecting wire, automatically starting the water pump or electrical equipment. By adjusting the pressure cap 7, the preload of the spring 6 can be changed, thereby adjusting the starting water pressure of the pressure switch to adapt to the needs of different systems. The explosion-proof pressure switch of this embodiment has a compact structure, good sealing performance, and high sensitivity, and is suitable for various explosion-proof environments, ensuring the reliable operation of the automatic sprinkler system.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A direct-adjustable explosion-proof pressure switch, comprising a box-shaped body, a micro switch and a terminal block disposed within the box-shaped body, and a transmission mechanism disposed on the box-shaped body and cooperating with the micro switch, characterized in that, The transmission mechanism includes: The connecting base has its head end fixed to the box-shaped body and extends partially into the box-shaped body. The connecting base has a flow channel inside. A diaphragm is disposed within the flow channel connecting the base; The push rod is movably positioned between the diaphragm and the micro switch, and includes a limit head and a fixing rod. The adjustment assembly includes a connecting cover, a spring, and a pressure cap; one end of the connecting cover is fixedly connected to the first end of the connecting base, and the other end is threadedly connected to the pressure cap, wherein both the connecting cover and the limiting head abut against the diaphragm to close the flow channel; the fixing rod passes through the connecting cover and the pressure cap in sequence, and the spring is sleeved on the fixing rod and pressed between the limiting head and the pressure cap; the fixing rod extends to the pressure cap and abuts against the micro switch.

2. The direct-adjustment explosion-proof pressure switch according to claim 1, characterized in that: The adjustment assembly also includes a pressure plate, which is detachably installed inside the box-shaped body and presses against the outer end face of the pressure cover.

3. The direct-adjustment explosion-proof pressure switch according to claim 1, characterized in that: The center of the connecting cover has a through hole for the fixing rod to pass through, and a limiting ring is provided in the through hole to block the limiting head.

4. The direct-adjustable explosion-proof pressure switch according to claim 1, characterized in that: The pressure cap has a cover hole that slides to fit the outer diameter of the fixing rod.

5. A direct-adjustable explosion-proof pressure switch according to claim 1, characterized in that: The diaphragm is made of silicone rubber.

6. The direct-adjustment explosion-proof pressure switch according to claim 1, characterized in that: The flow channel of the connecting base includes a first confluence section, a second confluence section, and a connecting section connected sequentially from the outside to the inside; the inner diameter of the first confluence section is larger than the inner diameter of the second confluence section, and the inner diameter of the connecting section is larger than the inner diameter of the second confluence section and is adapted to the outer diameter of the diaphragm; the connecting cover is disposed inside the connecting section.

7. A direct-adjustable explosion-proof pressure switch according to claim 1, characterized in that: The box-shaped body is provided with a cable outlet and a mounting port; the connecting base is located at the mounting port and is threadedly connected to the box-shaped body.

8. A direct-adjustable explosion-proof pressure switch according to claim 1, characterized in that: The inner side of the box-shaped body is provided with several protrusions for mounting microswitches and terminal blocks.

9. A direct-adjustable explosion-proof pressure switch according to claim 1, characterized in that: The terminal block is installed in the middle of the box-shaped body, dividing the internal cavity of the box-shaped body into a left chamber and a right chamber. The micro switch and the transmission mechanism are both set corresponding to the left chamber.

10. A direct-adjustment explosion-proof pressure switch according to claim 1, characterized in that: The tail end of the connecting base is provided with an external threaded protective cap.

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