Explosion-proof type explosion-proof electromagnetic valve

Abstract

An explosion-proof type explosion-proof electromagnetic valve comprises a magnetic conductive shell, an electromagnetic valve body, an electromagnetic valve body and a control device, an installation cavity is formed in the magnetic conductive shell, and the magnetic conductive shell is an electric conductor with magnetism; the driving assembly comprises a coil main body which is arranged in the mounting cavity; the explosion-proof coil is characterized in that the coil main body is wrapped and filled with an explosion-proof layer formed by an insulating heat-resistant material; the coil main body is electrically connected with the magnetic conductive shell, and the magnetic conductive shell is grounded; and the magnetic conductive shell is matched with the height of the coil main body and wraps the coil main body. According to the flame-proof type explosion-proof electromagnetic valve, the coil main body can take the magnetic conductive shell as a dielectric medium to realize grounding, so that the space for arranging a flame-proof shell and a wire holder is saved, and the volume miniaturization arrangement of the flame-proof type explosion-proof electromagnetic valve is facilitated; and meanwhile, the explosion-proof layer in the magnetic conductive shell also enables the explosion-proof capability of the magnetic conductive shell to be stronger, so that the magnetic conductive shell has the functions of explosion suppression and magnetic conduction at the same time, and has the advantage of dual purposes.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to a flameproof and explosion-proof solenoid valve. Background Art

[0002] Flameproof solenoid valve is the most widely used explosion-proof product. It mainly includes a flameproof shell and a coil assembly arranged in the flameproof shell. The explosion-proof body mainly refers to the flameproof shell, and the coil assembly includes a magnetic shell and a magnetic plate, a coil body, etc. Figure 1 In conventional flameproof solenoid valves, the flameproof casing 1' and the magnetic shell 2' are usually designed in a split structure, and the coil assembly 3' is installed inside the flameproof casing 1'. Since the wiring of the coil assembly 3' needs to be introduced from outside the flameproof casing 1' into the shell, and the minimum distance between the magnetic shell 2' and the flameproof casing 1' does not meet the requirements of the GB / T3836.2-2021 document for the creepage distance of flameproof solenoid valves, this type of flameproof solenoid valve generally has a terminal block 4' between the flameproof casing and the magnetic shell, and the magnetic shell 2' is electrically connected to the terminal block 4' in the flameproof casing 1' to achieve internal and external grounding.

[0003] The above-mentioned conventional explosion-proof solenoid valves are generally used indoors; however, with the expansion of the application scope of explosion-proof solenoid valves, the installation environment they face is becoming more complex and harsh, especially when used in relatively harsh installation environments such as outdoors and dust, conventional explosion-proof solenoid valves are not applicable. The reason is: based on the fact that conventional explosion-proof solenoid valves need to be installed with both explosion-proof outer shells and magnetic shells, considering the cost, explosion-proof layer thickness requirements, and the overall volume as small as possible, the magnetic shell of the above-mentioned explosion-proof solenoid valve is a separate internal accessory and its thickness is generally controlled within a range of less than or equal to 2 mm. This range can meet the requirements for coil temperature rise parameters during indoor installation, but cannot meet the installation requirements in outdoor and dusty environments. Due to the thickness limit of the magnetic shell, the magnetic induction intensity in the magnetic shell is small, and the power converted into coil heat generation is high, resulting in a large coil temperature rise when the solenoid valve is working. When used in relatively harsh installation environments such as outdoors and dust, there is a risk of igniting surrounding debris or dust explosion.

[0004] In addition, the terminal block of the conventional flameproof solenoid valve needs to connect two power lines from the outside of the flameproof shell to the inside of the conductive shell in addition to the ground wire. Therefore, the terminal block has three ports and is relatively large in size. In addition, the terminal block is located between the flameproof shell and the magnetic shell, which will result in a larger volume of the flameproof shell, generally around 100cm 3 As a result, the overall size of the solenoid valve is relatively large, which makes it inconvenient for users to install the solenoid valve. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a flameproof solenoid valve with higher explosion-proof capability, applicable in harsh environments and with a wider range of applications, in view of the above-mentioned existing technical status.

[0006] The second technical problem to be solved by the present invention is to provide a small-sized explosion-proof solenoid valve that is convenient for users to install in view of the above-mentioned existing technical status.

[0007] The technical solution adopted by the present invention to solve the first technical problem is: the flameproof and explosion-proof solenoid valve comprises: A magnetic conductive shell having an installation cavity formed therein, wherein the magnetic conductive shell is a magnetic electrical conductor; A driving assembly, including a coil body, is disposed in the installation cavity; The characteristics are as follows: the coil body is wrapped with an explosion-proof layer formed by insulating and heat-resistant materials; the coil body is electrically connected to the magnetic shell, and the magnetic shell is grounded; the magnetic shell matches the height of the coil body and is wrapped outside the coil body.

[0008] In order to facilitate the user to ground the magnetic shell, further, an internal grounding conductor is provided in the installation cavity, and the coil body is electrically connected to the magnetic shell through the internal grounding conductor; an external grounding conductor for grounding is conductively provided on the outer wall of the magnetic shell.

[0009] In order to facilitate the subsequent maintenance of the internal grounding conductor, a gap is further formed between the flameproof layer and the magnetic shell, and the internal grounding conductor is arranged in the gap. The internal grounding conductor is arranged in the gap so that the flameproof layer and the internal grounding conductor are isolated from each other. Compared with the existing flameproof solenoid valve in which a grounding seat is arranged in the flameproof layer between the flameproof outer shell and the magnetic shell, it is more convenient for users to check and replace the internal grounding conductor.

[0010] The technical solution adopted by the present invention to solve the second technical problem is: the magnetic shell matches the height of the coil body and is wrapped outside the coil body. This technical solution allows the volume of the magnetic shell to be further reduced to a size close to that of the coil body. In practical applications, the volume of the magnetic shell can be less than 100 cm 3 , reducing the volume of the magnetic shell and making it easier for users to install the solenoid valve.

[0011] The voltage of the coil body can be either AC voltage or DC voltage. In order to increase the electromagnetic force when the solenoid valve is opened, preferably, the coil body is connected to the power supply module, and the tracking voltage of the power supply module is a DC voltage. In practical applications, when the tracking voltage is an AC voltage, the power is increased by 20% compared with a conventional flameproof solenoid valve, and when the tracking voltage is a DC voltage, the electromagnetic force is increased by 25% compared with a conventional flameproof solenoid valve.

[0012] Furthermore, an installation channel is provided through the opposite surface of the magnetic shell, and the driving assembly also includes an iron core assembly. The iron core assembly is provided in the installation channel, and the coil body is provided on the periphery of the iron core assembly.

[0013] In order to reduce the volume of the magnetic shell, further, the width L2 of the explosion-proof joint surface between the inner wall of the installation channel and the core assembly is in the range of [6mm, 9.5mm]. The range of the explosion-proof joint surface width L2 is smaller than the conventional volume greater than 100cm 3 The explosion-proof joint surface width of the explosion-proof solenoid valve is smaller after assembly, which is convenient for users to install.

[0014] In order to enhance the waterproof performance of the magnetic shell, the magnetic shell further comprises a cover body and a bottom plate sealed with the cover body, and a seal is provided at the joint between the bottom plate and the cover body. The provision of the seal enables the magnetic shell to be soaked for a long time without leaking, which helps to improve the protection level.

[0015] In order to reduce the volume of the magnetic shell, the cover body and the bottom plate are further interference fit, and the range of the explosion-proof joint surface width L1 between the cover body and the bottom plate is [5mm, 9.5mm]. The interference fit assembly method can further reduce the minimum requirement for the width of the explosion-proof joint surface.

[0016] In order to further enhance the magnetic flux of the coil body and the waterproof ability of the magnetic shell, the thickness of the magnetic shell is greater than or equal to 4 mm. The thicker the magnetic shell, the greater the magnetic flux density of the electromagnetic field generated by the coil body, the stronger the magnetic flux of the coil body, and the thicker the magnetic shell, the stronger the anti-splashing ability of the solenoid valve, and the protection level is increased to IP68.

[0017] Compared with the prior art, the advantages of the present invention are: 1. In the flameproof and explosion-proof solenoid valve of the present invention, the coil body can use the magnetic shell as a dielectric to achieve grounding, eliminating the space for setting the flameproof housing and the terminal block, which is conducive to the miniaturization of the flameproof and explosion-proof solenoid valve and the thickening of the magnetic shell, thereby enabling the flameproof and explosion-proof solenoid valve to be used in a smaller installation space environment. At the same time, the flameproof layer in the magnetic shell also makes the explosion-proof ability of the magnetic shell stronger, so the magnetic shell has both flameproof and magnetic functions, and has the advantage of "one thing for two uses".

[0018] 2. The flameproof and explosion-proof solenoid valve in the present invention has the functions of both magnetic conductivity and flameproof. When the installation space is fixed, compared with the conventional flameproof solenoid valve, it is beneficial to thicken the thickness of the magnetic shell so that its thickness can be greater than the thickness of the magnetic shell in the conventional flameproof solenoid valve. Based on the high magnetic permeability of the magnetic shell itself, the increase in the thickness of the magnetic shell can increase the magnetic induction intensity of the coil. Therefore, under the same working conditions of other configurations and parameters, the effective power converted into the electromagnetic force part increases and the reactive power of the heat-generating part decreases. At the same time, the magnetic shell can also exchange heat with the external environment, thereby reducing the temperature rise of the coil and correspondingly reducing the power loss of the coil. On the other hand, the increase in the thickness of the magnetic shell will also reduce the magnetic leakage phenomenon of the solenoid valve, and the effective power of the coil will also be improved. In this way, the electromagnetic force required for the flameproof and explosion-proof solenoid valve can also be improved, thereby improving the valve opening capacity. At the same time, based on the characteristic of greatly reduced temperature rise of the coil, the temperature group level, one of the key indicators of the explosion-proof performance of the explosion-proof solenoid valve, has also been improved, optimizing the performance parameters of the explosion-proof solenoid valve; in addition, the increase in the thickness of the magnetic shell also increases the water pressure it can withstand, which brings about an improvement in the protection level and further expands the applicable explosion-proof environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A longitudinal cross-sectional view of a conventional flameproof and explosion-proof solenoid valve of the background technology; Figure 2 is a cross-sectional view of an embodiment of the present invention; Figure 3 4 is a cross-sectional view of a magnetic conductive shell according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings.

[0021] like Figure 2~3 The figure shows the best embodiment of the present invention. The flameproof solenoid valve of the present invention is mainly used in indoor environments with high explosion-proof requirements such as chemical industry, metallurgy, and pharmaceutical industry. When the flameproof solenoid valve is used in outdoor environments, dusty environments, and other environments with higher explosion-proof requirements, it needs to pass the IP66 or higher protection level and temperature group level test. The existing flameproof solenoid valve has poor waterproof ability, and the highest protection level is only IP65. The coil temperature rise is high, which does not meet the installation requirements in such environments. Therefore, it is beneficial to provide a flameproof solenoid valve with higher explosion-proof ability and can be used in harsh environments. The structure of the flameproof solenoid valve of this embodiment will be described in detail below: See also Figure 2The flameproof and explosion-proof solenoid valve includes a magnetic shell 1, a driving component 2 and a flameproof layer 3, wherein an installation cavity 11 is formed inside the magnetic shell 1, the magnetic shell 1 is a magnetic conductor, the driving component 2 is arranged in the installation cavity 11, and includes a coil body 21, and the coil body 21 is wrapped with a flameproof layer 3 formed by insulating and heat-resistant materials. The coil body 21 is electrically connected to the magnetic shell 1, and the magnetic shell 1 is grounded.

[0022] An internal grounding conductor 4 is provided in the installation cavity 11, and the coil body 21 is electrically connected to the magnetic shell 1 through the internal grounding conductor 4; an external grounding conductor 5 for grounding is conductively provided on the outer wall of the magnetic shell 1, which facilitates the user to ground the magnetic shell 1.

[0023] A gap 12 is formed between the explosion-proof layer 3 and the magnetic shell 1, and the internal grounding conductor 4 is arranged in the gap 12. The internal grounding conductor 4 is arranged in the gap 12 so that the explosion-proof layer 3 and the internal grounding conductor 4 are isolated from each other. Compared with the existing explosion-proof solenoid valve in which a grounding seat is arranged in the explosion-proof layer between the explosion-proof outer shell and the magnetic shell, it is more convenient for users to check and replace the internal grounding conductor 4, and it is convenient for subsequent maintenance of the internal grounding conductor 4. The applicant needs to emphasize that the above-mentioned gap 12 is not a conventional assembly gap, but is mainly designed for the installation of the internal grounding conductor 4. In actual applications, the plane area of ​​the internal grounding conductor 4 in the gap 12 is slightly larger than the contact area between the internal grounding conductor 4 and the inner wall of the magnetic shell.

[0024] The magnetic shell 1 matches the height of the coil body 21 and is wrapped outside the coil body 21. This technical solution allows the volume of the magnetic shell 1 to be further reduced to be close to the coil body 21. In actual applications, the volume of the magnetic shell 1 can be less than 100 cm 3 , reducing the volume of the magnetic shell 1, making it easier for users to install the solenoid valve.

[0025] The voltage of the coil body 21 can be either AC voltage or DC voltage. In order to increase the electromagnetic force when the solenoid valve is opened, the coil body 21 is connected to the power supply module, and the tracking voltage of the power supply module is a DC voltage. In practical applications, when the tracking voltage is an AC voltage, the power is increased by 20% compared with a conventional flameproof solenoid valve, and when the tracking voltage is a DC voltage, the electromagnetic force is increased by 25% compared with a conventional flameproof solenoid valve.

[0026] See also Figure 2 and 3The opposite side of the magnetic shell 1 is provided with an installation channel 13, and the drive assembly 2 also includes an iron core assembly 22. The iron core assembly 22 is provided in the installation channel 13, and the outer periphery of the iron core assembly 22 is provided with a coil body 21. The width L2 of the explosion-proof joint surface between the inner wall of the installation channel 13 and the iron core assembly 22 is in the range of [6mm, 9.5mm). The width L2 of the explosion-proof joint surface between the inner wall of the installation channel 13 and the iron core assembly 22 in this embodiment is preferably 6mm. The volume of the explosion-proof shell of a conventional explosion-proof solenoid valve is greater than 100cm 3 The width of the flameproof joint surface must be greater than 9.5 mm according to the national standard GB / T3836.2-2021; while the volume of the solenoid valve in this embodiment can be less than 100 cm 3 The range of the explosion-proof joint surface width L2 can be smaller than the explosion-proof joint surface width of the existing explosion-proof solenoid valve, which reduces the volume of the magnetic shell 1, and the volume is smaller after assembly, which is convenient for users to install. The terminology of the explosion-proof joint surface, the concept of the explosion-proof joint surface width, and the parameter requirements mentioned in this embodiment are quoted from the GB / T3836.2-2021 document.

[0027] The magnetic shell 1 includes a cover body 14 and a bottom plate 15 sealed with the cover body 14, and a seal 6 is provided at the joint between the bottom plate 15 and the cover body 14. The provision of the seal 6 enables the magnetic shell 1 to be soaked for a long time without leaking, which helps to improve the protection level and enhance the waterproof performance of the magnetic shell 1.

[0028] The cover body 14 and the bottom plate 15 are interference fit, and the range of the explosion-proof joint surface width L1 of the cover body 14 and the bottom plate 15 is [5mm, 9.5mm). In this embodiment, the explosion-proof joint surface width L1 of the cover body 14 and the bottom plate 15 is preferably 5mm. The interference fit assembly method can further reduce the minimum requirement for the width of the explosion-proof joint surface and further reduce the volume of the magnetic shell 1.

[0029] Finally, the thickness of the magnetic shell 1 is greater than or equal to 4 mm. The thicker the magnetic shell 1 is, the greater the density of the magnetic flux lines of the electromagnetic field generated by the coil body 21 is, and the magnetic flux of the coil body 21 is enhanced; at the same time, the thickening of the magnetic shell 1 makes the anti-splashing ability of the solenoid valve stronger, the waterproof ability of the magnetic shell 1 is improved, and the protection level is increased to IP68.

[0030] The working principle of the explosion-proof solenoid valve of this embodiment is as follows: the user turns on the power module to provide a DC voltage to the coil body 21, and the coil body 21 generates a magnetic field in the magnetic shell 1, driving the core assembly 22 to rise and open the flow path in the valve body; the coil body 21 is grounded inside the magnetic shell 1 and the magnetic shell 1 is designed to match the height of the coil body 21 to reduce the overall volume of the solenoid valve to 100 cm 3The following makes it more convenient to install outdoors; the thickening of the magnetic shell 1 increases the electromagnetic force generated by the coil body 21 by 25%, reduces the coil temperature rise, increases the temperature group from T4 to T5, and increases the protection level to IP68, which can be suitable for installation outdoors and in dusty environments.

Claims

1. A flameproof and explosion-proof solenoid valve, comprising: A magnetic conductive shell (1) is formed with a mounting cavity (11) inside, and the magnetic conductive shell (1) is a magnetic electrical conductor; A driving assembly (2) comprising a coil body (21) disposed in the mounting cavity (11); Features: The coil body (21) is wrapped with a flameproof layer (3) formed by insulating and heat-resistant material; the coil body (21) is electrically connected to the magnetic shell (1), and the magnetic shell (1) is grounded.

2. The flameproof and explosion-proof solenoid valve according to claim 1 is characterized in that: An internal grounding conductor (4) is provided in the installation cavity (11), and the coil body (21) is electrically connected to the magnetic shell (1) via the internal grounding conductor (4); an external grounding conductor (5) for grounding is conductively provided on the outer wall of the magnetic shell (1).

3. The flameproof and explosion-proof solenoid valve according to claim 2 is characterized in that: A gap (12) is formed between the flameproof layer (3) and the magnetic shell (1), and the internal grounding conductor (4) is arranged in the gap (12).

4. The flameproof and explosion-proof solenoid valve according to claim 1 is characterized in that: The magnetic conductive shell (1) matches the height of the coil body (21) and is wrapped outside the coil body (21).

5. The flameproof and explosion-proof solenoid valve according to any one of claims 1 to 4, characterized in that: The coil body (21) is connected to a power supply module for power supply, and the tracking voltage of the power supply module is a direct current voltage.

6. The flameproof and explosion-proof solenoid valve according to any one of claims 1 to 4, characterized in that: The opposite surface of the magnetic shell (1) is provided with a mounting channel (13), and the drive assembly (2) further comprises an iron core assembly (22). The mounting channel (13) is provided with an iron core assembly (22), and the outer periphery of the iron core assembly (22) is provided with the coil body (21).

7. The flameproof and explosion-proof solenoid valve according to claim 6 is characterized in that: The width L2 of the flameproof joint surface between the inner wall of the installation channel (13) and the iron core assembly (22) is in the range of [6 mm, 9.5 mm].

8. The flameproof and explosion-proof solenoid valve according to any one of claims 1 to 4, characterized in that: The magnetically conductive shell (1) comprises a cover body (14) and a bottom plate (15) sealed with the cover body (14); a sealing member (6) is provided at the joint between the bottom plate (15) and the cover body (14).

9. The flameproof and explosion-proof solenoid valve according to claim 8, characterized in that: The cover body (14) and the bottom plate (15) are interference fit, and the width L1 of the flameproof joint surface between the cover body (14) and the bottom plate (15) is in the range of [5 mm, 9.5 mm].

10. The flameproof and explosion-proof solenoid valve according to any one of claims 1 to 4, characterized in that: The thickness of the magnetic conductive shell (1) is greater than or equal to 4 mm.

Images