Explosion-proof electromagnetic pilot head

Abstract

The utility model discloses an explosion-proof electromagnetic pilot head which comprises a pilot base and a shell, a lead interface is arranged on the shell, the pilot base and the shell are arranged in a split mode, at least part of the pilot base is located in the shell and detachably connected with the shell, and the pilot base and the shell are axially limited. A gap is formed between at least part of the outer wall of the pilot base and at least part of the inner wall of the shell, the shell can rotate relative to the pilot base through the gap, the shell adopts the design scheme that the shell can rotate by 360 degrees, and in the installation process, the direction of a lead interface can be adjusted by rotating the shell; therefore, the lead interface can be installed at an angle which is most convenient to install.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof valve technology, and in particular to an explosion-proof electromagnetic pilot head. Background Technology

[0002] In explosive gas environments such as petrochemical, coal mining, and natural gas extraction, the explosion-proof performance of equipment is directly related to operational safety and production stability. Explosion-proof valves play a crucial role in these fields, effectively blocking the propagation of explosions. The explosion-proof electromagnetic pilot head, as a core component of the explosion-proof valve, is particularly important for its stable and reliable performance.

[0003] An explosion-proof electromagnetic pilot head typically consists of an explosion-proof housing and a pilot base. The lead wire interface of the explosion-proof electromagnetic pilot head is located on the explosion-proof housing. In existing technologies, the pilot base is integrated with the explosion-proof housing, or the pilot base is threadedly fixed to the explosion-proof housing. In actual installation scenarios, this design often makes the installation process difficult due to the complexity and diversity of the site environment. For example, since the angle of the lead wire interface cannot be adjusted, space limitations or unsuitable angles may be encountered during installation, thus increasing the installation difficulty. Therefore, it is necessary to improve this design. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing an explosion-proof electromagnetic pilot head. This head has a simple and reasonable structure and is easy to operate. The outer shell adopts a 360-degree rotatable design. During installation, the direction of the lead wire interface can be adjusted by rotating the outer shell, allowing the lead wire interface to be installed at the most convenient angle.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The present invention discloses an explosion-proof electromagnetic pilot head, comprising a pilot base and a housing. The housing is provided with a lead wire interface. The pilot base and the housing are separately disposed. At least a portion of the pilot base is located inside the housing and is detachably connected to the housing. The pilot base and the housing are axially limited. There is a gap between at least a portion of the outer wall of the pilot base and at least a portion of the inner wall of the housing, the gap allowing the housing to rotate relative to the pilot base.

[0007] Furthermore, the explosion-proof electromagnetic pilot head also includes a retaining ring, the housing includes a first stepped portion, and the pilot base is axially confined between the first stepped portion and the retaining ring.

[0008] Furthermore, the pilot base has a second stepped portion, the upper end of the second stepped portion abutting against the retaining spring, and the lower end of the second stepped portion abutting against the first stepped portion.

[0009] Furthermore, the pilot base is made of a magnetically conductive material.

[0010] Furthermore, the explosion-proof electromagnetic pilot head also includes an end cap, at least a portion of the outer peripheral wall of the end cap being fixedly disposed with at least a portion of the inner peripheral wall of the housing, and the inner wall of the end cap and the inner wall of the housing forming an explosion-proof chamber.

[0011] Furthermore, the explosion-proof electromagnetic pilot head also includes a coil assembly located within the explosion-proof chamber. The coil assembly includes a frame, a stationary iron core, and a moving iron core. Both the stationary and moving iron cores are located within the frame. The stationary iron core is fixedly disposed with the frame, and the moving iron core is located below the stationary iron core and can slide relative to the frame.

[0012] Furthermore, the explosion-proof electromagnetic pilot head also includes an exhaust shaft located within the explosion-proof chamber. The end cap has a first hole that extends axially through the end cap. At least a portion of the exhaust shaft passes through the first hole and is fixedly disposed therewith. The exhaust shaft includes an exhaust channel, and the stationary iron core includes a medium channel. One port of the exhaust channel corresponds to and communicates with the outlet end of the medium channel, while the other port of the exhaust channel communicates with the atmosphere.

[0013] Furthermore, the explosion-proof electromagnetic pilot head also includes a metal magnetic plate, and the coil assembly also includes an excitation housing, which is sleeved on the outside of the frame. The upper end face of the metal magnetic plate abuts against the excitation housing, and the lower end face of the metal magnetic plate abuts against the pilot base.

[0014] Furthermore, the coil assembly also includes a connecting terminal, a fixing block, and a hanging terminal. The fixing block is fixedly disposed with the frame, the connecting terminal is fixedly disposed with the fixing block, a coil is wound around the outside of the frame, the coil is connected to the hanging terminal, and the connecting terminal and the hanging terminal make contact and cooperate to form an electrical connection.

[0015] Furthermore, the connecting terminal has a threaded portion inside, the two ends of the fixing block extend downward to form a plug-in portion, and the frame includes a slot that mates with the plug-in portion, and the plug-in portion is plugged into the slot.

[0016] The beneficial effects of this utility model are as follows: The explosion-proof electromagnetic pilot head of this utility model has a lead wire interface on the outer shell, and the pilot base and the outer shell are separately set. At least a part of the pilot base is located inside the outer shell and is detachably connected to the outer shell. The pilot base and the outer shell are axially limited, and there is a gap between at least a part of the outer wall of the pilot base and at least a part of the inner wall of the outer shell. The gap allows the outer shell to rotate relative to the pilot base. The outer shell adopts a 360-degree rotatable design. During the installation process, the direction of the lead wire interface can be adjusted by rotating the outer shell, so that the lead wire interface can be installed at the most convenient installation angle. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0019] Figure 3 yes Figure 1 Enlarged structural diagram at point B;

[0020] Figure 4 This is a schematic diagram of the coil assembly;

[0021] Figure 5 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure when the excitation shell, metal magnetic plate and pilot base are connected;

[0023] Figure 7 This is a schematic diagram of the structure when the connecting terminals and fixing blocks are separated from the frame.

[0024] Figures 1-7 In the middle section: 1. Pilot base; 11. Second step; 2. Outer shell; 21. Lead wire interface; 22. First step; 3. Snap ring; 4. End cap; 5. Explosion-proof chamber; 6. Coil assembly; 61. Frame; 611. Slot; 62. Stationary iron core; 621. Medium channel; 63. Moving iron core; 631. First spring; 632. Sleeve; 64. Excitation shell; 65. Connecting terminal; 66. Fixing block; 661. Insertion part; 662. Hanging terminal; 67. Coil plastic shell; 68. Magnetic sleeve; 691. First cover; 692. Second cover; 7. Exhaust shaft; 71. Exhaust channel; 711. Dust cap; 8. Metal magnetic plate; 91. First seal; 92. Second seal; 93. Third seal; 94. Fourth seal; 95. Fifth seal. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figures 1-7 The explosion-proof electromagnetic pilot head shown includes a pilot base 1 and a housing 2. The housing 2 is provided with a lead wire interface 21. The pilot base 1 and the housing 2 are separately configured. At least a portion of the pilot base 1 is located inside the housing 2 and detachably connected to it. The pilot base 1 and the housing 2 are axially limited. A gap exists between at least a portion of the outer wall of the pilot base 1 and at least a portion of the inner wall of the housing 2, allowing the housing 2 to rotate relative to the pilot base 1. The housing 2 adopts a 360-degree rotatable design. During installation, the direction of the lead wire interface 21 can be adjusted by rotating the housing 2. This allows the lead interface 21 to be installed at the most convenient angle. Preferably, in this embodiment, the pilot base 1 is made of a magnetic material, which improves electromagnetic efficiency, enhances the attraction of the moving iron core 63, and reduces the power of the coil accordingly. This makes the explosion-proof electromagnetic pilot head perform well in low-power operation. Compared with the prior art, where the pilot base 1 and the explosion-proof housing 2 are integrated, for example, if the housing 2 is made of aluminum, then the pilot base 1 is also made of aluminum; if the housing 2 is made of stainless steel, then the pilot base 1 is also made of stainless steel. The pilot base 1 is not a magnetic material, and in terms of performance, it cannot achieve ultra-low power.

[0027] Preferably, in this embodiment, refer to Figures 1-2 The explosion-proof electromagnetic pilot head also includes a retaining ring 3. Specifically, the housing 2 also includes a first retaining groove, and the retaining ring 3 is located in the first retaining groove to ensure the secure installation of the retaining ring 3. The housing 2 also includes a first step portion 22, and the pilot base 1 is axially limited between the first step portion 22 and the retaining ring 3 to restrict the axial movement of the pilot base 1 and ensure the stability and reliability of the pilot base 1.

[0028] Preferably, in this embodiment, refer to Figures 1-2 The pilot base 1 has a second step portion 11. The upper end of the second step portion 11 abuts against the retaining spring 3, and the lower end of the second step portion 11 abuts against the first step portion 22. The second step portion 11 abuts against the first step portion 22 and the retaining spring 3 respectively and is limited to ensure a stable and reliable connection.

[0029] Preferably, in this embodiment, refer to Figure 1 and Figure 5 The explosion-proof electromagnetic pilot head also includes an end cap 4. At least a portion of the outer peripheral wall of the end cap 4 is fixedly disposed with at least a portion of the inner peripheral wall of the outer shell 2, ensuring the stability of the structure. The inner wall of the end cap 4 and the inner wall of the outer shell 2 cooperate to form an explosion-proof chamber 5. The presence of the explosion-proof chamber 5 effectively improves the safety performance of the explosion-proof electromagnetic pilot head.

[0030] Preferably, in this embodiment, refer to Figure 4 The explosion-proof electromagnetic pilot head also includes a coil assembly 6, which is located inside the explosion-proof chamber 5. The coil assembly 6 includes a frame 61, a stationary iron core 62, and a moving iron core 63. The stationary iron core 62 and the moving iron core 63 are both located inside the frame 61. The stationary iron core 62 is fixedly installed with the frame 61 to ensure the stability of the connection. The moving iron core 63 is located below the stationary iron core 62 and can slide relative to the frame 61. A first spring 631 is provided between the moving iron core 63 and the pilot base 1. The first spring 631 is used to reset the moving iron core 63. When energized, the moving iron core 63 moves upward towards the stationary iron core 62 under the electromagnetic force, overcoming the spring force of the first spring 631. After de-energization, the moving iron core 63 resets under the spring force of the first spring 631.

[0031] Preferably, see Figure 1 The coil assembly 6 further includes a sleeve 632, at least a portion of the moving iron core 63 is located inside the sleeve 632, and the sleeve 632 is made of a magnetically shielding material, which can optimize the magnetic circuit.

[0032] Preferably, in this embodiment, refer to Figure 1 , Figure 3 and Figure 5 The explosion-proof electromagnetic pilot head also includes an exhaust shaft 7, which is located inside the explosion-proof chamber 5. The end cover 4 has a first hole that penetrates the end cover 4 axially. At least a portion of the exhaust shaft 7 passes through the first hole and is fixedly installed therein to ensure a stable connection. The exhaust shaft 7 includes an exhaust channel 71, and the stationary iron core 62 includes a medium channel 621. One port of the exhaust channel 71 corresponds to and is connected to the outlet end of the medium channel 621. The other port of the exhaust channel 71 is connected to the atmosphere. Excess gas is discharged into the atmosphere through the medium channel 621 and the exhaust channel 71. Preferably, a dust cap 711 is also provided at the port of the exhaust channel 71 that is connected to the atmosphere to prevent dust or other impurities from entering the channel.

[0033] Preferably, in this embodiment, refer to Figure 1 and Figure 2The explosion-proof electromagnetic pilot head also includes a metal magnetic plate 8, which is made of a strong magnetic material. The coil assembly 6 also includes an excitation housing 64, which is fitted over the frame 61. The upper end face of the metal magnetic plate 8 abuts against the excitation housing 64, and the lower end face of the metal magnetic plate 8 abuts against the pilot base 1. Specifically, the upper end face of the metal magnetic plate 8 is interference-fitted with the excitation housing 64, and the lower end face of the metal magnetic plate 8 is interference-fitted with the pilot base 1, ensuring a tight fit and eliminating the contact gap between the metal magnetic plate 8 and the two end components. Without the metal magnetic plate 8, a certain gap would inevitably form between the excitation housing 64 and the pilot base 1. In this case, there may be air in the gap, causing a sudden change in magnetic reluctance at the gap, which may prevent the formation of a continuous closed magnetic circuit. This invention, by introducing the metal magnetic plate 8, whose strong magnetic permeability and interference fit structure together achieve efficient closure of the magnetic circuit, thereby improving the performance and reliability of the entire explosion-proof electromagnetic pilot head.

[0034] Preferably, in this embodiment, refer to Figure 4 and Figure 7 The coil assembly 6 further includes a coil plastic casing 67, a magnetic sleeve 68, a first cover 691, a second cover 692, a connecting terminal 65, a fixing block 66, and a hanging terminal 662. The upper end of the excitation shell 64 is fixedly connected to the first cover 691, and the lower end of the excitation shell 64 is fixedly connected to the second cover 692. The magnetic sleeve 68 is located inside the frame 61 to optimize the magnetic circuit. The fixing block 66 is fixedly installed to the frame 61. Specifically, the fixing block 66 is riveted to the frame 61 to ensure the stability of the connection. The connecting terminal 65 is fixedly installed to the fixing block 66. A coil is wound around the outside of the frame 61. The coil is connected to the hanging terminal 662. The connecting terminal 65 and the hanging terminal 662 make contact and cooperate to form an electrical connection.

[0035] Specifically, after the skeleton 61 is injection molded, the connecting terminal 65 and the fixing block 66 are installed on the skeleton 61, and then the coil is wound onto the hanging terminal 662. Finally, the assembled skeleton 61 and coil assembly 6 are placed into the injection mold, and the outer injection molded shell 2 is injection molded.

[0036] Preferably, in this embodiment, the connecting terminal 65 has a threaded portion for engaging with a connecting screw. (See reference...) Figure 7 The two ends of the fixing block 66 extend downward to form insertion parts 661. The frame 61 includes slots 611 that cooperate with the insertion parts 661. The insertion parts 661 and slots 611 are inserted and cooperated to ensure the stability of the connection and restrict the rotational freedom of the fixing block 66.

[0037] In traditional electromagnetic pilot heads, the coil assembly 6 typically uses plug-in terminals to connect the coil to external wires. The coil leads are directly soldered to the mounting portion of the plug-in terminal, and the external wires are connected to the plug-in terminal via crimping or simple plug-in connections. However, during actual assembly or maintenance, when the external wires are tightened to the plug-in terminal with screws, the torque generated by the screw rotation is easily transmitted to the plug-in terminal. This causes the solder joints on the mounting portion to detach due to the pulling force, leading to coil open-circuit or short-circuit faults and affecting the reliability of the electromagnetic pilot head.

[0038] In this invention, the lead wire of the coil is fixed to the front end of the hanging terminal 662 (the side away from the connecting terminal 65) by welding, and the hanging terminal 662 and the fixing block 66 are integrally formed. Since the fixing block 66 is limited to the slot 611 of the frame 61 by the plug part 661 and fixed by riveting, when the threaded part of the connecting terminal 65 generates torque due to the tightening of the screw, the torque is transmitted through the fixing block 66 to the limiting surface of the slot 611 of the frame 61 (rather than the welding point of the hanging terminal 662), thus avoiding the welding point from detaching due to the force of pulling.

[0039] In this invention, at least a portion of the outer peripheral wall of the pilot base 1 and at least a portion of the inner peripheral wall of the outer shell 2 cooperate to form a first explosion-proof surface; at least a portion of the outer peripheral wall of the exhaust shaft 7 and at least a portion of the inner peripheral wall of the end cover 4 cooperate to form a second explosion-proof surface; at least a portion of the outer peripheral wall of the end cover 4 and at least a portion of the inner peripheral wall of the outer shell 2 cooperate to form a third explosion-proof surface. Through the cooperation of these three explosion-proof surfaces, the potential sparks or arcs generated inside the electromagnetic pilot head are effectively prevented from spreading outward, thereby improving the safety performance of the equipment.

[0040] Specifically, see Figures 1-3 The explosion-proof electromagnetic pilot head includes a first sealing element 91 located between the pilot base 1 and the outer casing 2; a second sealing element 92 located between the outer casing 2 and the end cap 4; a third sealing element 93 located between the exhaust shaft 7 and the end cap 4; a fourth sealing element 94 located between the exhaust shaft 7 and the stationary iron core 62; and a fifth sealing element 95 located between the exhaust shaft 7 and the dust cap 711. These sealing elements further enhance the sealing performance of the explosion-proof electromagnetic pilot head, effectively preventing harmful substances such as dust and moisture from the external environment from entering the interior of the electromagnetic pilot head and protecting the internal electrical components from damage. Preferably, the first sealing element 91, the second sealing element 92, the third sealing element 93, the fourth sealing element 94, and the fifth sealing element 95 can all be configured as sealing rings.

[0041] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. An explosion-proof electromagnetic pilot head, characterized in that: The device includes a pilot base (1) and a housing (2). The housing (2) is provided with a lead wire interface (21). The pilot base (1) and the housing (2) are separately arranged. At least a portion of the pilot base (1) is located inside the housing (2) and is detachably connected to the housing (2). The pilot base (1) and the housing (2) are axially limited. There is a gap between at least a portion of the outer wall of the pilot base (1) and at least a portion of the inner wall of the housing (2). The gap allows the housing (2) to rotate relative to the pilot base (1).

2. The explosion-proof electromagnetic pilot head according to claim 1, characterized in that: The explosion-proof electromagnetic pilot head also includes a retaining ring (3), the outer shell (2) includes a first step portion (22), and the pilot base (1) is axially limited between the first step portion (22) and the retaining ring (3).

3. The explosion-proof electromagnetic pilot head according to claim 2, characterized in that: The pilot base (1) has a second step (11), the upper end of the second step (11) abuts against the snap ring (3), and the lower end of the second step (11) abuts against the first step (22).

4. The explosion-proof electromagnetic pilot head according to claim 1, characterized in that: The pilot base (1) is made of magnetic material.

5. The explosion-proof electromagnetic pilot head according to claim 1, characterized in that: The explosion-proof electromagnetic pilot head also includes an end cap (4), at least a portion of the outer peripheral wall of the end cap (4) is fixedly disposed with at least a portion of the inner peripheral wall of the outer shell (2), and the inner wall of the end cap (4) and the inner wall of the outer shell (2) cooperate to form an explosion-proof chamber (5).

6. The explosion-proof electromagnetic pilot head according to claim 5, characterized in that: The explosion-proof electromagnetic pilot head also includes a coil assembly (6), which is located inside the explosion-proof chamber (5). The coil assembly (6) includes a frame (61), a stationary iron core (62), and a moving iron core (63). The stationary iron core (62) and the moving iron core (63) are both located inside the frame (61). The stationary iron core (62) is fixedly installed with the frame (61). The moving iron core (63) is located below the stationary iron core (62) and can slide relative to the frame (61). A first spring (631) is provided between the moving iron core (63) and the pilot base (1).

7. The explosion-proof electromagnetic pilot head according to claim 6, characterized in that: The explosion-proof electromagnetic pilot head also includes an exhaust shaft (7), which is located inside the explosion-proof chamber (5). The end cover (4) has a first hole that penetrates the end cover (4) axially. At least a portion of the exhaust shaft (7) passes through the first hole and is fixedly disposed therewith. The exhaust shaft (7) includes an exhaust channel (71), and the stationary iron core (62) includes a medium channel (621). One port of the exhaust channel (71) corresponds to and is connected to the outlet end of the medium channel (621), and the other port of the exhaust channel (71) is connected to the atmosphere.

8. The explosion-proof electromagnetic pilot head according to claim 6, characterized in that: The explosion-proof electromagnetic pilot head also includes a metal magnetic plate (8), and the coil assembly (6) also includes an excitation shell (64). The excitation shell (64) is sleeved on the outside of the frame (61). The upper end face of the metal magnetic plate (8) abuts against the excitation shell (64), and the lower end face of the metal magnetic plate (8) abuts against the pilot base (1).

9. An explosion-proof electromagnetic pilot head according to claim 8, characterized in that: The coil assembly (6) further includes a connecting terminal (65), a fixing block (66), and a hanging terminal (662). The fixing block (66) is fixedly disposed with the frame (61), and the connecting terminal (65) is fixedly disposed with the fixing block (66). A coil is wound around the outside of the frame (61), and the coil is connected to the hanging terminal (662). The connecting terminal (65) and the hanging terminal (662) are in contact and cooperate to form an electrical connection.

10. An explosion-proof electromagnetic pilot head according to claim 9, characterized in that: The connecting terminal (65) has a threaded portion inside, and the two ends of the fixing block (66) extend downward to form a plug-in portion (661). The frame (61) includes a slot (611) that mates with the plug-in portion (661). The plug-in portion (661) and the slot (611) are plugged into each other.

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