An IIC-class explosion-proof setpoint controller

Abstract

This invention discloses an IIC-class explosion-proof setpoint controller, relating to the technical field of explosion-proof controllers. It includes an explosion-proof housing, a control component disposed inside the housing, a wiring harness at the interface of the control component, and multiple openings at the bottom of the housing to accommodate the wiring harness. It also includes an alignment bracket positioned directly below the openings, with a guide tube fixedly connected to the bottom of the alignment bracket. In this invention, the sealing structure descends synchronously with the elastic limiting ring, falling into the space between the wiring harness and the guide tube. This fills any excess gaps inside the guide tube, preventing IIC-class gas from overflowing between the explosion-proof housing and the external environment, thus improving the safety of the control component during operation and enhancing the overall explosion-proof performance of the setpoint controller. This invention allows for simultaneous downward pressure operation on multiple sealing structures, enabling sealing structures at different locations to fall synchronously, quickly, and accurately into the guide tube, improving operational efficiency and portability.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof control instrument technology, and in particular to an IIC type explosion-proof setpoint control instrument. Background Technology

[0002] Explosion-proof setpoint controllers are mostly installed in locations with explosion hazards, such as petroleum and chemical plants. This is because these locations contain flammable gases that can easily form explosive mixtures with air, as well as flammable dust that can form explosive mixtures with air. An explosion of an explosive gas mixture requires two conditions: a certain gas concentration and sufficient spark energy. Safety measures in electrical equipment are essentially designed to prevent these two conditions from occurring simultaneously. Therefore, explosion-proof setpoint controllers are used for real-time monitoring.

[0003] IIC, as a designation for explosion-proof rating, corresponds to typical examples of IIC-class gases that can cause explosions, such as hydrogen and ether nitrate. An explosion requires three necessary conditions: ignition point, oxidizing gas, and combustible material. An explosion will occur if all three conditions are met simultaneously; restricting any one of these necessary conditions limits the occurrence of an explosion.

[0004] Existing explosion-proof setpoint controllers require the internal control component wiring to extend to the outside of the instrument housing for connection to the power supply. A connecting pipe is typically installed through the through-hole, covering the outside of the wiring extension point. During normal use, a gap can easily exist between the connecting pipe and the wiring, allowing gas to pass through and enter the instrument housing, posing a safety hazard. Therefore, this application provides a Class IIC explosion-proof setpoint controller to meet this requirement. Summary of the Invention

[0005] To address the aforementioned issues, this application provides an IIC-class explosion-proof setpoint controller.

[0006] To achieve the above objectives, this application provides the following technical solution: an explosion-proof setpoint controller of type IIC, including an explosion-proof housing, a control component is provided on the inner side of the explosion-proof housing, a wire harness is provided at the interface end of the control component, a plurality of openings are provided at the bottom end of the explosion-proof housing to accommodate the wire harness passing through, and an alignment bracket is provided directly below the openings, with a guide tube fixedly connected to the bottom end of the alignment bracket.

[0007] It also includes an adjustment plate located in the lower part of the explosion-proof housing cavity. The surface of the adjustment plate has multiple through holes parallel to the openings. A mounting ring is detachably connected to the lower part of the through holes. An elastic limiting ring is detachably connected to the inner side of the mounting ring. A sealing structure is fixedly connected to the elastic limiting ring. The sealing structure can descend synchronously with the adjustment plate, the mounting ring, and the elastic limiting ring, falling into the relative space between the wire harness and the guide tube.

[0008] Furthermore, the sealing structure includes an elastic guide ring extending from the inner wall of the elastic limiting ring to its lower end, an airbag fixedly connected to the bottom of the elastic guide ring, and an elastic contraction ring fixedly connected to the bottom end of the airbag.

[0009] Both the elastic guide ring and the elastic contraction ring are hollow frustum structures, with the inner diameter at the bottom being smaller than the inner diameter at the top.

[0010] Furthermore, the bottom of the elastic shrink ring has multiple notches arranged in a ring structure, and the inner side of the notch is connected to a ball bearing via a rotating shaft. As the elastic shrink ring slides into the inner side of the guide tube along the direction of the wire harness, the ball bearing slides on the outer surface of the wire harness.

[0011] Furthermore, the inner wall of the guide tube extends along its vertical central axis to form an inward protrusion. When the airbag falls into the inner side of the guide tube, the inward protrusion squeezes the airbag to deform until the airbag presses against the surface of the wire harness.

[0012] Furthermore, the elastic limiting ring and the elastic guiding ring form a sandwich space. When the mounting ring and the elastic limiting ring slide downward to the limit position, the top end of the guide tube abuts against the inner surface of the sandwich space.

[0013] Furthermore, the inner surface of the mounting ring is provided with a guide rail, and the outer surface of the elastic limiting ring extends to form an arc-shaped inner block that is adapted to the guide rail.

[0014] Furthermore, both ends of the adjustment plate are connected to movable arms via pivots. The end of the movable arm near the inner wall of the explosion-proof housing is bent upward to form an extension arm. The top of the extension arm is connected to a stop strip via positioning bolts. The stop strip and the support foot of the extension arm form a closed channel.

[0015] Furthermore, a guide frame is detachably connected to the inner wall of the explosion-proof housing. The support leg of the extension arm is located inside the recessed part of the guide frame. A sliding rod is provided through the guide frame. A limiting ball frame is fixedly connected to one end of the sliding rod near the closed channel. The end face of the limiting ball frame is connected to the end face of the recessed part of the guide frame through a pressure spring. When the sliding rod is pulled, the pressure spring is compressed and contracted by the end face of the limiting ball frame until the limiting ball frame disengages from the closed channel.

[0016] Furthermore, the ends of the front and rear sliding rods are detachably connected to the same connecting rod.

[0017] Furthermore, mounting angle plates are detachably connected to both sides and the rear of the explosion-proof housing.

[0018] In summary, the technical effects and advantages of this invention are as follows:

[0019] 1. This invention incorporates a connected elastic limiting ring and a sealing structure. The sealing structure descends synchronously with the elastic limiting ring, falling into the space between the wire harness and the guide tube. This fills any excess gaps inside the guide tube, preventing the leakage of Class IIC gases between the explosion-proof housing and the external environment. This improves the safety of the control components during operation and enhances the explosion-proof performance of the entire setpoint controller.

[0020] 2. In this invention, multiple sealing structures can be pressed down simultaneously, enabling sealing structures at different positions to fall into the guide tube synchronously, quickly and accurately, thus improving operational efficiency and portability.

[0021] 3. In this invention, during the process of the sealing structure sliding into the guide tube in the direction of the wire harness, the ball bearing can slide on the outer surface of the wire harness. The sliding of the ball bearing can reduce the friction between the elastic contraction ring and the wire harness when it descends, improve the smoothness of the movement process, and effectively prevent the surface of the wire harness from being scratched and worn.

[0022] 4. During the process of the sealing structure sliding into the guide tube in the direction of the wire harness, the inward protrusion compresses the airbag, causing deformation until the airbag presses tightly against the surface of the wire harness. The connection between the airbag and the wire harness can eliminate the gap formed between the wire harness and the elastic guide ring when the wire harness swings, improving the sealing performance when the wire harness moves. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0025] Figure 2 This is a schematic diagram of the internal view after the explosion-proof housing of the present invention is opened.

[0026] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0027] Figure 4 For the present invention Figure 2 A schematic diagram of the enlarged middle section.

[0028] Figure 5 This is a three-dimensional structural diagram of the present invention.

[0029] Figure 6 This is a front view structural diagram of the present invention.

[0030] Figure 7 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0031] Figure 8 For the present invention Figure 2 A schematic diagram of the enlarged middle section.

[0032] In the diagram: 1. Explosion-proof housing; 11. Alignment bracket; 12. Guide tube; 121. Inward push protrusion; 13. Control component; 14. Wiring harness; 15. Mounting angle plate; 2. Adjusting plate; 21. Movable arm; 22. Extension arm; 23. Stop bar; 24. Positioning bolt; 3. Mounting ring; 31. Guide rail; 4. Elastic limit ring; 41. Arc-shaped inner block; 5. Elastic guide ring; 6. Airbag; 7. Elastic contraction ring; 8. Ball bearing; 9. Guide frame; 91. Sliding rod; 92. Pressure spring; 93. Limiting ball frame; 94. Connecting rod. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: Reference Figure 1 , Figure 2 and Figure 4 The illustrated IIC-class explosion-proof setpoint controller includes an explosion-proof housing 1. A control component 13 is disposed inside the housing 1. A wiring harness 14 is disposed at the interface end of the control component 13. The bottom of the housing 1 has multiple openings for the wiring harness 14 to pass through. It also includes an alignment bracket 11 located directly below the openings, with a guide tube 12 fixedly connected to the bottom of the alignment bracket 11. During actual wiring, the wiring harness 14 can pass through the openings, the alignment bracket 11, and the guide tube 12 to connect with electrical components on the outside of the explosion-proof housing 1.

[0035] It also includes an adjustment plate 2 located inside the lower part of the explosion-proof housing 1. The surface of the adjustment plate 2 has multiple through holes parallel to the openings. A mounting ring 3 is detachably connected to the lower part of each through hole. An elastic limiting ring 4 is detachably connected to the inner side of the mounting ring 3. A sealing structure is fixedly connected to the elastic limiting ring 4. The sealing structure descends synchronously with the adjustment plate 2, mounting ring 3, and elastic limiting ring 4, falling into the relative space between the wiring harness 14 and the guide tube 12. This fills the excess gap inside the guide tube 12, preventing the leakage of Class IIC gases between the explosion-proof housing 1 and the external environment, improving the safety of the control component 13 during operation, and enhancing the explosion-proof performance of the entire setpoint controller.

[0036] like Figure 3 , Figure 5 As shown, the sealing structure includes an elastic guide ring 5 extending from the inner wall of the elastic limiting ring 4 to its lower end. An airbag 6 is fixedly connected to the bottom of the elastic guide ring 5, and an elastic contraction ring 7 is fixedly connected to the bottom end of the airbag 6.

[0037] Both the elastic guide ring 5 and the elastic contraction ring 7 are hollow frustum structures, with the inner diameter at the bottom being smaller than that at the top. The elastic guide ring 5, the airbag 6, and the elastic contraction ring 7 can effectively seal the excess gaps inside the guide tube 12, preventing Class IIC gases from entering the interior of the explosion-proof enclosure 1 through the gaps, thus improving the overall sealing performance of the explosion-proof enclosure 1.

[0038] Meanwhile, the downward pressing operation does not affect the normal wiring of the wire harness 14, reducing obstacles during wiring. After the wiring is completed, during the movement of the sealing structure, the sealing structures at different positions can fall into the interior of the guide tube 12 synchronously, quickly and accurately, improving operating efficiency and portability.

[0039] like Figure 6 , Figure 7 As shown, the bottom of the elastic contraction ring 7 has multiple annularly distributed notches. Ball bearings 8 are connected to the inner side of each notch via a rotating shaft. As the elastic contraction ring 7 slides into the guide tube 12 along the direction of the wire harness 14, the ball bearings 8 slide on the outer surface of the wire harness 14. The sliding of the ball bearings 8 reduces the friction between the elastic contraction ring 7 and the wire harness 14 during descent, improving the smoothness of movement and effectively preventing wear and tear on the surface of the wire harness 14.

[0040] Example 2: As Figure 7 As shown, the inner wall of the guide tube 12 extends along its vertical central axis to form an inward protrusion 121. When the airbag 6 falls into the inner side of the guide tube 12, the inward protrusion 121 squeezes the airbag 6 to deform it until the airbag 6 presses against the surface of the wire harness 14. The connection between the airbag 6 and the wire harness 14 can eliminate the gap formed between the wire harness 14 and the elastic guide ring 5 when the wire harness 14 swings, and improve the sealing performance of the wire harness 14 when it moves.

[0041] like Figure 4 , Figure 7 As shown, the elastic limiting ring 4 and the elastic guiding ring 5 form a sandwich space. When the mounting ring 3 and the elastic limiting ring 4 slide downward to their extreme positions, the top end of the guide tube 12 abuts against the inner surface of the sandwich space. This improves the tightness of the connection between the guide tube 12, the elastic limiting ring 4, and the elastic guiding ring 5, preventing dust from entering the interior of the explosion-proof housing 1 through the gaps in the elastic guiding ring 5.

[0042] like Figure 6 . Figure 7As shown, a guide rail 31 is formed on the inner surface of the mounting ring 3, and an arc-shaped inner block 41 that matches the guide rail 31 extends from the outer surface of the elastic limiting ring 4. The embedded connection between the arc-shaped inner block 41 and the guide rail 31 maintains the stability of the elastic limiting ring 4. Furthermore, as the elastic limiting ring 4 and the sealing structure are used for an extended period, they can be disassembled according to actual needs, offering the advantage of portable operation.

[0043] like Figure 4 As shown, both ends of the adjusting plate 2 are connected to movable arms 21 via pivots. The ends of the movable arms 21 closest to the inner wall of the explosion-proof housing 1 are bent upwards to form extension arms 22. The top of the extension arms 22 is connected to a stop bar 23 via positioning bolts 24, and the stop bar 23 and the support feet of the extension arms 22 form a closed channel. Both the movable arms 21 and the extension arms 22 can move up and down, driving the adjusting plate 2 to move up and down.

[0044] like Figure 5 , Figure 8 As shown, a guide frame 9 is detachably connected to the inner wall of the explosion-proof housing 1. The support leg of the extension arm 22 is located inside the recessed part of the guide frame 9. A sliding rod 91 is provided through the guide frame 9. A limiting ball frame 93 is fixedly connected to one end of the sliding rod 91 near the closed channel. The end face of the limiting ball frame 93 is connected to the end face of the recessed part of the guide frame 9 through a pressure spring 92.

[0045] In its natural state, the pressure spring 92 can drive the limiting ball frame 93 to press against the closed channel, ensuring the linearity of the extension arm 22, the movable arm 21 and the adjusting plate 2 during the lifting and lowering process, so that the sealing structure can be accurately connected to the guide tube 12 and avoid the occurrence of deviation.

[0046] To disassemble the adjusting plate 2, the stop bar 23 needs to be removed. The adjusting plate 2, movable arm 21, and extension arm 22 can be moved upward to their extreme positions. Pulling the sliding rod 91 will cause the pressure spring 92 to be compressed by the end face of the limiting ball frame 93 until the limiting ball frame 93 disengages from the closed channel. Then, the movable arm 21 and extension arm 22 can be bent downward to release the stabilization of the adjusting plate 2, allowing for cleaning and replacement of the adjusting plate 2 and the components below it.

[0047] like Figure 8 As shown, the ends of the front and rear sliding rods 91 are detachably connected to the same link 94. By controlling the movement of the link 94, the movement of the two sliding rods 91 located on one side can be controlled synchronously until the limiting ball frame 93 is removed from the closed channel, and the extension arm 22 and the guide frame 9 are disassembled.

[0048] like Figure 1As shown, mounting angle plates 15 are detachably connected to both sides and the rear of the explosion-proof enclosure 1, which can install the entire explosion-proof enclosure 1 and its auxiliary components on the wall to ensure its stability during installation.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A Class IIC explosion-proof setpoint controller, comprising an explosion-proof housing (1), wherein a control component (13) is disposed on the inner side of the explosion-proof housing (1), a wire harness (14) is disposed at the interface end of the control component (13), and a plurality of openings for accommodating the wire harness (14) to pass through are provided at the bottom end of the explosion-proof housing (1), characterized in that: It also includes a positioning bracket (11) located directly below the opening, with a guide tube (12) fixedly connected to the bottom end of the positioning bracket (11). It also includes an adjustment plate (2) located in the inner cavity of the explosion-proof housing (1) and at the bottom. The surface of the adjustment plate (2) has multiple through holes parallel to the opening. A mounting ring (3) is detachably connected to the bottom of the through holes. An elastic limiting ring (4) is detachably connected to the inner side of the mounting ring (3). A sealing structure is fixedly connected to the elastic limiting ring (4). The sealing structure can descend synchronously with the adjustment plate (2), the mounting ring (3), and the elastic limiting ring (4) and fall into the relative space between the wire harness (14) and the guide tube (12). The sealing structure includes an elastic guide ring (5) extending from the inner wall of the elastic limiting ring (4) to its lower end. An airbag (6) is fixedly connected to the bottom of the elastic guide ring (5), and an elastic contraction ring (7) is fixedly connected to the bottom end of the airbag (6). The elastic guide ring (5) and the elastic contraction ring (7) are both hollow frustum structures, with the inner diameter of the bottom end being smaller than the inner diameter of the top end. The bottom of the elastic shrink ring (7) has multiple notches arranged in a ring structure. The inner side of the notches is connected to a ball (8) through a rotating shaft. During the process of the elastic shrink ring (7) sliding into the inner side of the guide tube (12) along the direction of the wire harness (14), the ball (8) slides on the outer surface of the wire harness (14). The inner wall of the guide tube (12) extends along its vertical central axis to form an inward push protrusion (121). When the airbag (6) falls into the inner side of the guide tube (12), the inward push protrusion (121) squeezes the airbag (6) to produce deformation until the airbag (6) presses against the surface of the wire harness (14). The elastic limiting ring (4) and the elastic guiding ring (5) form a sandwich space. When the mounting ring (3) and the elastic limiting ring (4) slide down to the limit position, the top end of the guide tube (12) abuts against the inner surface of the sandwich space.

2. The explosion-proof setpoint controller of type IIC according to claim 1, characterized in that: The inner surface of the mounting ring (3) is provided with a guide rail (31), and the outer surface of the elastic limiting ring (4) extends to form an arc-shaped inner block (41) that is adapted to the guide rail (31).

3. The explosion-proof setpoint controller of type IIC according to claim 1, characterized in that: Both ends of the adjustment plate (2) are connected to movable arms (21) via rotating shafts. The movable arms (21) are bent upward at the end near the inner wall of the explosion-proof shell (1) to form an extension arm (22). The top of the extension arm (22) is connected to a stop strip (23) via a positioning bolt (24). The stop strip (23) and the support foot of the extension arm (22) form a closed channel.

4. The explosion-proof setpoint controller of type IIC according to claim 3, characterized in that: The explosion-proof housing (1) is detachably connected to a guide frame (9). The support leg of the extension arm (22) is located inside the recessed part of the guide frame (9). A sliding rod (91) is provided through the guide frame (9). A limiting ball frame (93) is fixedly connected to one end of the sliding rod (91) near the closed channel. The end face of the limiting ball frame (93) is connected to the end face of the recessed part of the guide frame (9) through a pressure spring (92). When the sliding rod (91) is pulled, the pressure spring (92) is squeezed and contracted by the end face of the limiting ball frame (93) until the limiting ball frame (93) is disengaged from the closed channel.

5. The IIC-class explosion-proof setpoint controller according to claim 4, characterized in that: The ends of the front and rear sliding rods (91) are detachably connected to the same link (94).

6. The explosion-proof setpoint controller of type IIC according to claim 1, characterized in that: The explosion-proof housing (1) is detachably connected to mounting angle plates (15) on both sides and at the rear position.

Images