A flameproof transposition device

Abstract

The invention discloses a flameproof transposition device, characterized in that it comprises a flameproof housing (1), a transposition component, and a contact switch (3), wherein the contact switch (3) is located in the flameproof housing (1), the transposition component is arranged to penetrate the flameproof housing (1), and comprises a knob portion (206) located outside the flameproof housing (1), and a paddle portion (205) located inside the flameproof housing (1), wherein the knob portion (206) and the paddle portion (205) are connected via a rotating shaft (203), so that the paddle portion (205) can rotate with the rotation of the knob portion (206), wherein when the knob portion (206) rotates to a first position, the paddle portion (205) contacts the contact switch (3), and switches the contact switch (3) from a first state to a second state. The invention is used on a flameproof housing and has a simple structure, convenient installation, and reliable operation.

Description

Technical Field

[0001] The invention relates to a flameproof transposition device, in particular to a flameproof shell internal switch transposition device. Background Art

[0002] Explosion-proof electrical appliances are divided into Class I, Class II, and Class III according to the requirements of GB3836 "Explosive Atmospheres". Class I electrical equipment is used in coal mine gas environments. According to the explosion-proof type, different explosion-proof types or combinations of types such as explosion-proof type, increased safety type, intrinsic safety type, and encapsulation type are separated. According to the national standard, Class I flameproof enclosures, except for conductors that comply with the intrinsically safe circuits in GB3836 and conductors used for equipotential bonding or grounding, all accessible conductors should be separated from the power supply before the flameproof enclosure is opened. The separation device requires that the flameproof enclosure has an external control mechanism, which must meet the requirements of the electrical clearance between phases and to the ground, the creepage distance, and the power frequency withstand voltage MT / T661-2011 while meeting the flameproof requirements.

[0003] Electromechanical equipment used in coal mines with explosive hazards such as gas and coal dust includes flameproof and flameproof intrinsically safe equipment. Relevant standards stipulate that these equipment must be powered off before opening the cover (opening the shell) during use and maintenance.

[0004] When the above equipment with a flameproof enclosure needs to be opened for maintenance, but the front-stage power supply cannot be directly cut off, a flameproof transposition operating device is required to control the electrical switch inside the flameproof enclosure so that the front-stage power supply can be cut off before opening the cover. Specifically, in order to open the cover with power off, the electrical switch inside the flameproof enclosure must be cut off. In this way, an external operating device is required to achieve the requirement of controlling the components inside the flameproof enclosure.

[0005] Existing transposition operating devices include magnetic switches and button operating mechanisms. For magnetic switches, since the magnetism of magnets is greatly affected by the external environment, such as heat, shock, etc., which will weaken the magnetism and affect its working performance, there are safety hazards. Therefore, in the coal mine gas environment, magnetic switches are gradually replaced. The button operating mechanism includes a direct button operating mechanism and an indirect button operating mechanism. The direct button operating mechanism requires that the operating mechanism (switch) itself must be flameproof. This type of operating mechanism is relatively large in size, generally non-disassembly and repairable, with a complex structure and occupying a large space inside the flameproof cavity; the indirect button operating mechanism is affected by the button stroke, and the electrical clearance and creepage distance between the mechanism and the contact do not meet the flameproof requirements. The on and off positions are unclear, and it is easy to cause repeated misoperation. In an explosive gas environment, the danger cannot be ignored and must be avoided.

[0006] Most of the existing operating devices are button operated. For the light touch switch without self-locking function, the existing button operating mechanism has potential safety hazards and is relatively complicated to implement. Summary of the invention

[0007] In view of the above, the object of the present invention is to provide a flameproof transposition operating device for controlling a power-off switch (power switch) inside the device so that the front-stage power supply can be cut off before opening the door cover (housing) of the device.

[0008] The present invention can fill the gap in the market, so that the touch switch without self-locking function can also be well used in the flameproof housing, realizing the requirement of opening the cover when power is off for flameproof products, making it more practical and bringing value to safe production operation.

[0009] According to an embodiment of the present invention, a flameproof displacement device is provided, characterized in that it comprises a flameproof casing (1), a displacement component, and a contact switch (3), wherein the contact switch (3) is located in the flameproof casing (1), the displacement component is arranged to penetrate the flameproof casing (1), and comprises a knob portion (206) located outside the flameproof casing (1), and a paddle portion (205) located inside the flameproof casing (1), wherein the knob portion (206) and the paddle portion (205) are connected via a rotating shaft (203), so that the paddle portion (205) can rotate with the rotation of the knob portion (206), wherein when the knob portion (206) rotates to a first position, the paddle portion (205) contacts the contact switch (3), and causes the contact switch (3) to switch from a first state to a second state.

[0010] According to an embodiment of the present invention, the flameproof displacement device further comprises a fixing seat (201) embedded in the flameproof housing (1), and the fixing seat (201) is used to define the position of the knob portion (206).

[0011] According to an embodiment of the present invention, the knob portion (206) is in the shape of a strip, and the outer side of the fixing seat (201) has a first slot, and when the knob portion (206) is rotated to the first position, the knob portion (206) is inserted into the first slot.

[0012] According to an embodiment of the present invention, the outer side of the fixing seat (201) has a second slot, and when the knob portion (206) is rotated to the second position, the paddle portion (205) is not in contact with the contact switch (3), and the knob portion (206) is inserted into the second slot.

[0013] According to an embodiment of the present invention, the second card slot has a different depth from the first card slot.

[0014] According to an embodiment of the present invention, the flameproof transposition device further comprises a spring (204), which is sleeved on the rotating shaft (203) and is used to provide an axially inward elastic force to the knob portion (206), wherein the knob portion (206) can move inward and outward along the axial direction.

[0015] The advantages and beneficial effects of the embodiments of the present invention include:

[0016] 1. The fixing seat adopts special-shaped slots, making the fixing of the target state safer and more reliable;

[0017] 2. It is equipped with an L-shaped rotating handle, a spring, and an asymmetric paddle to achieve rotation angle limit and axial limit through their mutual cooperation, thus realizing the switch transposition state;

[0018] 3. The knob shaft of the explosion-proof joint part is matched with the copper sleeve, and the matching surface is a cylindrical explosion-proof joint surface, which can effectively control the explosion-proof gap to 0.1mm and achieve better explosion-proof performance;

[0019] 4. The paddle adopts an asymmetric structure to limit the rotation angle of the knob shaft in the operating mechanism. Even in the event of an erroneous operation, the switch inside the flameproof shell is in the closed state, which has a better practical effect and makes the operation of the entire product safer. While meeting the flameproof requirements, it increases the electrical clearance and creepage distance and improves the pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figures 1 to 5 2 is a schematic structural diagram of a flameproof transposition device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0023] The purpose of the present invention is to provide a flameproof transposition operating device, which realizes the on-off control of non-safety active contact circuits in flameproof products. The L-shaped knob handle in the operating device drives the rotating shaft to rotate on the cylindrical flameproof surface of the flameproof joint part. At the same time, under the limiting action of the spring, the rotating shaft drives the asymmetric structure of the control part to contact the contact switch in the flameproof cavity to complete the switch transposition state. The L-shaped knob handle, the special-shaped slot fixing seat and the internal asymmetric structure paddle work together. Under the condition of meeting the flameproof requirements, the L-shaped knob handle clarifies the rotation direction, and the special-shaped slot and the internal asymmetric paddle work together to accurately locate the on-off position. At the same time, the gap between the asymmetric paddle and the contact increases the electrical clearance and creepage distance, and improves the power frequency withstand voltage performance. This solution increases the electrical clearance and creepage distance while meeting the relevant marking requirements of explosion-proof electrical appliances, improves the withstand voltage level, and greatly increases the safety index. Bring more beneficial value to safe production operation.

[0024] like Figure 1 As shown, an embodiment of the present invention provides a flameproof transposition device, which includes a flameproof housing 1, a transposition component, a touch switch (contact switch) 3, a switch bracket 4, and a bracket fixing seat 5. The transposition component includes a fixing seat 201, a copper sleeve 202, a knob shaft 203, a knob handle 206, a spring 204 and a paddle 205.

[0025] The fixing seat 201 may be provided with card slots in two directions (horizontal and vertical), and the card slots have different depths in the horizontal and vertical directions, wherein the horizontal card slot is deeper and the vertical card slot is shallower, so that the switch status can be easily distinguished.

[0026] The knob shaft 203 is matched with the copper sleeve 202, and the axial length of the matching surface is the flameproof effective length.

[0027] The rotating handle 206 can drive the rotating shaft 203 to be axially limited by the spring 204, so that the rotating handle 206 connected to the knob shaft 203 can be stretched, rotated, and operated freely.

[0028] like Figure 2 As shown, the rotating handle 206 can be L-shaped to increase the operational feel and facilitate the distinction of the rotation direction. After rotation, it can be locked in the corresponding slot in the horizontal or vertical direction of the fixing seat 201, thereby driving the rotation of the paddle 205 through the rotation of the knob shaft 203 to achieve the requirement of changing position.

[0029] The paddle 205 may be an asymmetric structure, that is, the two ends are respectively a long end and a short end, to avoid misoperation. The short end is not long enough to contact the pressing piece of the touch switch 3, and only when the long end is downward will it contact and press the pressing piece of the touch switch 3 to make the touch switch 3 pass.

[0030] When the flameproof transposition device is in the first state (i.e., the off state), that is, see Figure 2 , the knob handle 206 is in a vertical position, at which time, the inner side of the knob handle 206 is stuck in the vertical slot of the fixing seat 201 (for example, the slot is shallow), and the knob shaft 203 is in a stable state. Figure 3 , the paddle 205 is in a horizontal position and is not in contact with the touch switch 3, that is, the touch switch 3 in the flameproof housing is in an off state.

[0031] When the rotary handle 206 is pulled out and rotated in the first state, the knob shaft 203 and the paddle 205 are driven to rotate simultaneously, and after rotating 90 degrees in a specified direction (for example, indicated by the switch indicator located outside), the flameproof transposition device is in the second state (i.e., the conducting state). Figure 4 As shown, the rotating handle 206 is in a horizontal position, the rotating handle 206 is stuck in a horizontal slot of the fixing seat 201 (for example, the slot is deep), and the knob shaft 203 is in a stable state. Figure 5 As shown, the paddle 205 is in a vertical position, and its long end contacts and presses the pressing piece of the touch switch 3. At this time, the touch switch 3 in the flameproof housing is in a conducting state.

[0032] On the other hand, as an example, in the first state, if the rotating handle 206 is not rotated in the prescribed direction, but is rotated 90 degrees in the opposite direction (incorrect direction), the rotating handle 206 is also in a horizontal position at this time, and the rotating handle 206 can also be stuck in the horizontal slot of the fixed base 201, and the knob shaft 203 is in a stable state. However, at this time, the short end of the paddle 205 is at the bottom, and the short end cannot contact and press the pressing piece of the touch switch 3, so the touch switch 3 in the explosion-proof shell is still in the off state.

[0033] Optionally, both ends of the paddle 205 may also be symmetrical structures, that is, both ends are long ends, and in this case, the rotating handle 206 is not limited by the above-mentioned rotation direction.

[0034] Finally, those skilled in the art will appreciate that various modifications, variations, and substitutions may be made to the above-described embodiments of the present invention, all of which fall within the protection scope of the present invention as defined by the appended claims.

Claims

1. A flameproof transposition device, characterized in that It comprises a flameproof housing (1), a transposition component, and a contact switch (3). The contact switch (3) is located in the flameproof enclosure (1). The displacement component is arranged to penetrate the flameproof housing (1), and comprises a knob portion (206) located outside the flameproof housing (1) and a paddle portion (205) located inside the flameproof housing (1); the knob portion (206) and the paddle portion (205) are connected via a rotating shaft (203), so that the paddle portion (205) can rotate along with the rotation of the knob portion (206). Wherein, when the knob portion (206) is rotated to the first position, the paddle portion (205) contacts the contact switch (3) and switches the contact switch (3) from the first state to the second state, and the flameproof displacement device further comprises a fixing seat (201) embedded in the flameproof housing (1), the fixing seat (201) being used to limit the position of the knob portion (206), the knob portion (206) being in the shape of a strip, and the outer side of the fixing seat (201) having a first slot, and when the knob portion (206) is rotated to the first position, the knob portion (206) is inserted into the first slot, The outer side of the fixing seat (201) has a second slot, and when the knob portion (206) is rotated to the second position, the paddle portion (205) is not in contact with the contact switch (3), and the knob portion (206) is inserted into the second slot.

2. The flameproof transposition device according to claim 1, characterized in that: The second card slot has a different depth from the first card slot.

3. The flameproof transposition device according to claim 1 or 2, characterized in that It also includes a spring (204), which is sleeved on the rotating shaft (203) and is used to provide an axial inward elastic force to the knob portion (206), wherein the knob portion (206) can move inward and outward along the axial direction.

Images