阅读说明：本技术 本安防爆型人体静电释放球 (Intrinsic safety explosion-proof human body static electricity releasing ball ) 是由 邵家辉 许诺 吴东辉 于 2020-04-24 设计创作，主要内容包括：本发明涉及人体静电释放消除的技术领域,特别是一种本安防爆型人体静电释放球。其特征是：至少包括触摸球、弹性复位装置、永磁体、常闭磁控开关、地线,所述常闭磁控开关一端连接在所述触摸球上,所述常闭磁控开关另一端连接在所述地线上,所述触摸球可以沿一轴线做行程运动,手按动触摸球前常闭磁控开关处于永磁体的磁场中而处于开路状态,手按动触摸球进行行程运动使常闭磁控开关失去永磁体的磁场而闭合,人体静电通过手触摸的触摸球传导至地线,松手后在所述弹性复位装置的作用下使触摸球复位并使常闭磁控开关获得永磁体的磁场而开路。(The invention relates to the technical field of human body static electricity discharge elimination, in particular to an intrinsic safety explosion-proof human body static electricity discharge ball. The method is characterized in that: the touch ball is pressed by hand to perform stroke motion to enable the normally closed magnetic control switch to lose the magnetic field of the permanent magnet and be closed, the static electricity of a human body is conducted to the ground wire through the touch ball touched by hand, and after the hand is released, the touch ball is reset under the action of the elastic resetting device and enables the normally closed magnetic control switch to obtain the magnetic field of the permanent magnet and be opened.)

1. An intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the touch ball is driven to perform stroke movement when the touch ball is pressed by a hand, the normally closed magnetic control switch is closed when the normally closed magnetic control switch is far away from the permanent magnet, the static electricity of a human body is conducted to the ground wire through the touch ball touched by the hand, and the touch ball is reset under the action of the elastic resetting device and the normally closed magnetic control switch obtains the magnetic field of the permanent magnet to realize open circuit when the hand is released.

2. An intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the touch ball type touch switch at least comprises a touch ball, an elastic resetting device, a permanent magnet, a normally closed magnetic control switch, a resistor, a normally open magnetic control switch and a ground wire, wherein the normally closed magnetic control switch is connected in series with the resistor and bridged between the touch ball and the ground wire, one end of the normally open magnetic control switch is connected to the touch ball, the other end of the normally open magnetic control switch is connected to the ground wire, the permanent magnet is connected to the touch ball and can do stroke motion along an axis, the normally closed magnetic control switch is arranged at an initial position corresponding to the stroke, the normally open magnetic control switch is positioned in the stroke motion of the permanent magnet, the normally closed magnetic control switch is positioned in the magnetic field of the permanent magnet and is in an open circuit state before a moving contact is pressed by a hand, the normally closed magnetic control switch is not positioned in the magnetic field of the permanent magnet and is in an open circuit state when the moving contact, the static electricity of the human body is conducted to the ground wire through the touch ball and the resistor touched by the hand to carry out pre-discharge, the permanent magnet is continuously pressed to be close to the normally-open magnetic control switch to be closed, the static electricity of the human body is conducted to the ground wire through the touch ball touched by the hand to carry out complete discharge, the touch ball is reset under the action of the elastic reset device after the hand is released, the normally-open magnetic control switch loses the magnetic field of the permanent magnet to be opened, and the normally-closed magnetic control switch obtains the magnetic field of the permanent magnet to be opened.

3. An intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the touch ball is driven to perform stroke movement when the touch ball is pressed by a hand, the normally closed magnetic control switch is closed when the permanent magnet is far away from the normally closed magnetic control switch, the static electricity of a human body is conducted to the ground wire through the touch ball touched by the hand, and the touch ball is reset under the action of the elastic resetting device and the normally closed magnetic control switch obtains the magnetic field of the permanent magnet to be opened when the hand is released.

4. The intrinsically safe explosion-proof human body static electricity releasing ball as claimed in claim 3, wherein: the touch control device is characterized by further comprising a second normally closed magnetic control switch and a resistor, wherein one end of the second normally closed magnetic control switch is connected to the touch ball, the other end of the second normally closed magnetic control switch is connected to the ground after being connected in series with the resistor, the second normally closed magnetic control switch is located in a magnetic field of an initial position of the permanent magnet, when the touch ball is pressed by a hand, the permanent magnet is driven to perform stroke movement, the action of the second normally closed magnetic control switch is prior to that of the first normally closed magnetic control switch, and pre-discharging is performed through the resistor.

5. The intrinsically safe explosion-proof human body static electricity releasing ball as claimed in claim 1, 2, 3 or 4, wherein: a resistor is arranged to be connected with the normally closed magnetic control switch in parallel, and the resistance value is as follows: 10 megohm-1000 megohm.

6. The intrinsically safe explosion-proof human body static electricity releasing ball as claimed in claim 1, 2, 3 or 4, wherein: the resistance is 2 kilo-ohm-1000 mega-ohm.

7. The intrinsically safe explosion-proof human body static electricity releasing ball as claimed in claim 6, wherein: the resistance is 50-400 megohms.

8. The intrinsically safe explosion-proof human body static electricity releasing ball as claimed in claim 1, 2, 3 or 4, wherein: and the indicating lamp string is connected in the loop of the normally closed magnetic control switch or the normally open magnetic control switch and is used for indicating the working state of the magnetic control switch.

9. The intrinsically safe explosion-proof human body static electricity releasing ball as claimed in claim 1, 2, 3 or 4, wherein: the magnetic control switch is an explosion-proof magnetic control switch.

10. The intrinsically safe explosion-proof human body static electricity releasing ball as claimed in claim 9, wherein: the magnetic control switch is a reed switch.

Technical Field

The invention relates to the technical field of human body static electricity discharge elimination, in particular to an intrinsic safety explosion-proof human body static electricity discharge ball.

Background

The human body static electricity releasing ball is also called as a human body static electricity eliminating ball, and is a human body static electricity releasing product suitable for inflammable, explosive and static electricity preventing places.

However, the existing human body static electricity releasing ball is made of stainless steel, the ball body (the touch ball) is connected with the ground, and the human body static electricity is quickly introduced into the ground after a hand contacts the ball body.

The static electricity of the human body needs a certain time (relaxation time), and for the traditional fixed static electricity releasing ball, an operator can hardly subjectively judge whether the time needed for eliminating the static electricity is reached.

Disclosure of Invention

The intrinsic safety is derived from the GB 3836.4-201 standard, explosion-proof electrical appliances are classified into explosion-proof type, safety-increasing type, intrinsic safety type and the like, and the intrinsic safety type electrical equipment is characterized in that all circuits are intrinsic safety circuits, namely, the circuits cannot ignite specified explosive mixtures due to electric sparks and thermal effects generated under normal work or specified fault states. That is, the electric appliance is not explosion-proof by the outer shell and the filler, but the energy of electric spark or heat effect generated by the circuit in normal use or failure is less than 0.28mJ, namely the gas concentration is 8.5% (the most explosive concentration) of the minimum ignition energy.

The human body electrostatic discharge requires no spark, no electric shock, and no long discharge time, and the human body capacitance is usually a constant value according to Q (electric quantity) = U (voltage) × C (capacitance), I (current) = U (voltage)/R (resistance), and in order to avoid instantaneous discharge, a discharge resistance is provided, i.e. the discharge power P = U is limited²In the case of a constant resistance, the voltage decreases with the decrease in the quantity of electricity, the discharge current decreases, the discharge time increases, and the discharge power decreases rapidly with the square of the voltage (P = U) (/ R)²/R), if a discharge power is defined, the resistance decreases rapidly for a rapid discharge.

According to the time constant T = RC of the discharge, under the condition that C is constant, the larger the resistance, the longer the required discharge time is, and the smaller the resistance, the larger the discharge power is, and the sparks are easy to generate, so the variable resistance discharge is also solved.

The invention aims to avoid electric sparks (or isolate electric sparks) in the process of releasing the static electricity of the human body, further avoid electric shock feeling to the human body and realize quick static electricity release.

The technical scheme of the invention is as follows:

an intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the touch ball is pressed by hand to perform stroke motion to enable the normally closed magnetic control switch to lose the magnetic field of the permanent magnet and be closed, the static electricity of a human body is conducted to the ground wire through the touch ball touched by hand, and after the hand is released, the touch ball is reset under the action of the elastic resetting device and enables the normally closed magnetic control switch to obtain the magnetic field of the permanent magnet and be opened.

An intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the touch ball is reset under the action of the elastic resetting device after hands are released, and the normally closed magnetic control switch obtains the magnetic field of the permanent magnet to open the circuit;

or: the touch ball is driven to perform stroke movement when the touch ball is pressed by a hand, the normally closed magnetic control switch is closed when the normally closed magnetic control switch is far away from the permanent magnet, the static electricity of a human body is conducted to the ground wire through the touch ball touched by the hand, and the touch ball is reset under the action of the elastic resetting device and the normally closed magnetic control switch obtains the magnetic field of the permanent magnet to realize open circuit when the hand is released.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: a resistor is arranged to be connected with the normally closed magnetic control switch in parallel, and the resistance value is as follows: 10 megohm-1000 megohm.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the touch control device is characterized by further comprising a second normally closed magnetic control switch and a resistor, wherein one end of the second normally closed magnetic control switch is connected to the touch ball, the other end of the second normally closed magnetic control switch is connected to the ground after being connected in series with the resistor, the second normally closed magnetic control switch is located in a magnetic field of an initial position of the permanent magnet, when the touch ball is pressed by a hand, the permanent magnet is driven to perform stroke movement, the action of the second normally closed magnetic control switch is prior to that of the first normally closed magnetic control switch, and pre-discharging is performed through the resistor.

And further, the device also comprises an nth normally closed magnetic control switch and a resistor, wherein n times of pre-discharge are carried out, and n is the number of times of pre-discharge.

An intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the touch ball type touch switch at least comprises a touch ball, an elastic resetting device, a permanent magnet, a normally closed magnetic control switch, a resistor, a normally open magnetic control switch and a ground wire, wherein the normally closed magnetic control switch is connected in series with the resistor and bridged between the touch ball and the ground wire, one end of the normally open magnetic control switch is connected to the touch ball, the other end of the normally open magnetic control switch is connected to the ground wire, the permanent magnet is connected to the touch ball and can do stroke motion along an axis, the normally closed magnetic control switch is arranged at an initial position corresponding to the stroke, the normally open magnetic control switch is positioned in the stroke motion of the permanent magnet, the normally closed magnetic control switch is positioned in the magnetic field of the permanent magnet and is in an open circuit state before a moving contact is pressed by a hand, the normally closed magnetic control switch is not positioned in the magnetic field of the permanent magnet and is in an open circuit state when the moving contact, the static electricity of the human body is conducted to the ground wire through the touch ball and the resistor touched by the hand to carry out pre-discharge, the permanent magnet is continuously pressed to be close to the normally-open magnetic control switch to be closed, the static electricity of the human body is conducted to the ground wire through the touch ball touched by the hand to carry out complete discharge, the touch ball is reset under the action of the elastic reset device after the hand is released, the normally-open magnetic control switch loses the magnetic field of the permanent magnet to be opened, and the normally-closed magnetic control switch obtains the magnetic field of the permanent magnet to be opened.

Further, the resistance is 2 kilo-ohms-1000 mega-ohms.

And optimizing, wherein the resistance is 50-400 megohms.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: and the indicating lamp string is connected in the loop of the normally closed magnetic control switch or the normally open magnetic control switch and is used for indicating the working state of the magnetic control switch.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the magnetic control switch is an explosion-proof magnetic control switch.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the magnetic control switch is a reed switch.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the elastic reset device consists of a spring.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the elastic reset device is made of rubber or conductive rubber.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the device also comprises an electrostatic detection device which is used for detecting the electrostatic discharge effect and prompting by sound or light.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: mechanical ringing is also included, and the ringing prompts after the static electricity of the human body is released.

The intrinsic safety explosion-proof human body static electricity release ball is characterized in that: the installation positions of the normally closed magnetic control switch and the permanent magnet can be interchanged.

The invention has the beneficial effects that: the electric spark is not generated (or isolated) in the process of releasing the static electricity of the human body, so that the human body is further not shocked, and meanwhile, the time required by releasing the static electricity is ensured (unexpected effect) due to the existence of the pressing stroke.

Drawings

FIG. 1 is a schematic diagram of the apparatus of the present invention.

FIG. 2 is a schematic diagram of the device for increasing the pre-discharge by 1 time according to the present invention.

FIG. 3 is a circuit diagram of a serial indicator light according to the present invention.

Fig. 4 is an embodiment of the present invention for adding mechanical ring alert.

Fig. 5 is an embodiment of a secondary discharge in combination with a normally open reed switch (normally open magnetically controlled switch).

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic diagram of the device of the invention, and 301 is a normally closed reed pipe. The touch ball 101 is made of a conductive material, 202 is a stroke rod connected to the touch ball 101, a spring 201 is arranged on the stroke rod 202, the spring 201 is used for enabling the stroke rod 202 to reset after a hand releases the touch ball 101, permanent magnets 302 and 102 are transition sections made of insulating materials and used for enabling the touch ball 101 and a support 103 to be insulated, 104 is a base plate, the support 103 and the base plate 104 are made of conductive materials, one end of a normally closed reed switch 301 is connected to the touch ball 101, and the other end of the normally closed reed switch is connected to the support so as to be connected to the ground. The working principle is as follows:

when a human body carries static electricity, the touch ball 101 is touched by a hand and the touch ball 101 is pressed (when the touch ball 101 is touched by the hand but before the touch ball 101 is pressed, the normally closed reed pipe 301 is in a magnetic field of the permanent magnet 302 and is in an open circuit state, the touch ball 101 is not grounded, so electric sparks cannot be generated when the touch ball 101 is touched by the hand), in the pressing process, the touch ball 101 drives the stroke rod 202 to perform stroke motion on an axis and simultaneously drives the permanent magnet 302 to perform stroke motion, when the permanent magnet is far away from the normally closed reed pipe 301, the normally closed reed pipe 301 is closed, at the moment, the human body static electricity is led into the chassis through the closed reed pipe 301 and is merged into the ground, and after the touch ball 101 is released by the hand, the stroke rod 202 drives the touch ball.

Considering that the permanent magnet and the reed switch form the proximity switch, the installation or arrangement positions of the permanent magnet and the reed switch can be interchanged, and the connecting electric circuit is unchanged.

Because two electric contacts of the reed switch are positioned in the closed space and belong to an explosion-proof device, even if electric sparks are generated by the electric contacts of the reed switch, the electric sparks cannot be transmitted to the outside, so that the reed switch is an intrinsic safety explosion-proof device.

Considering the electrostatic grounding concept, the leakage resistance is 10 mega ohm-1000 mega ohm, and actually, the resistance of several mega ohm is equivalent to direct grounding (zero resistance grounding easily generates electrostatic spark), a resistor can be arranged in parallel with the normally closed reed switch 301, and pre-discharge is performed when touching, and the resistance value is: 10 megohm-1000 megohm. Meanwhile, due to the existence of the pressing stroke (according to an RC discharge curve, 70% of human body voltage can be pre-released within about 3 seconds), the time required by electrostatic pre-release is ensured (unexpected effect).

In view of the variant of embodiment, the essential features of the invention are: the touch ball is provided with a permanent magnet, a normally closed magnetic switch (normally closed reed pipe) is arranged at a proper position corresponding to the permanent magnet, and the normally closed magnetic switch is bridged between the touch ball and the ground. And a resistor of 10-1000 megohms is connected in parallel with the normally closed magnetic control switch. Variant embodiments are as follows: the touch ball is made of conductive rubber, the permanent magnet is arranged on the conductive rubber, the normally closed magnetic control switch is bridged between the conductive rubber and the ground, the resistance value of the conductive rubber is 10-1000 mega ohm (equivalent to the resistance connected in parallel at two ends of the normally closed magnetic control switch), and the permanent magnet is reset by the elasticity of the conductive rubber (equivalent to an elastic resetting device).

FIG. 2 is a schematic diagram of the device for increasing the pre-discharge by 1 time according to the present invention. In this embodiment, a second normally closed reed pipe 303 and a resistor 401 are added on the basis of the embodiment of fig. 1, the second normally closed reed pipe 303 and the resistor 401 are connected in series and then connected between the touch ball 101 and the ground, the normally closed reed pipes 301 and 303 are in the magnetic field of the permanent magnet 302 and are in an open circuit state at an initial position, during the stroke of the stroke rod 202, 303 is in a current action, 301 is in a back action, and the process is as follows:

firstly, the touch ball 101 is touched by hand, and the transition section 102 keeps the touch ball 101 insulated from the ground, so that electrostatic sparks cannot be generated during touch;

secondly, the touch ball 101 is pressed by hand to drive the stroke rod 202 to do stroke motion;

thirdly, the permanent magnet 302 on the stroke rod 202 leaves the second normally closed reed pipe 303 to close the second normally closed reed pipe 303, at the moment, the static electricity of the human body is pre-discharged through the resistor 401, and the electric shock feeling of the human body can be eliminated by selecting the resistance value of the resistor 401;

at present, a touch ball body made of a sub-conductor material (the industry standard SY/T7354-2017, the resistance is 10-1000 megohms) is adopted, the instantaneous human body static electricity release energy is reduced, the electric shock feeling is reduced, the human body static electricity release time needs to be prolonged, and static electricity carried by a human body cannot be completely released due to the existence of the resistance.

The human body resistance is generally 2 kilo-ohm-20 mega-ohm, the human body static is generally thousands of volts-tens of thousands of volts, the air breakdown field intensity is about 30kV/cm, the electrostatic shock of the finger tip is just caused by air breakdown, if 3000 volts are needed for breakdown according to 1mm, 9000 volts of the human body electrostatic voltage is taken, according to the ohm law, the voltage distributed by the human body does not exceed 3000 volts, and the resistance is 4 kilo-ohm-600 mega-ohm. According to specific tests, most of the conditions (such as 100 megohms) can be satisfied by taking 50 megohms to 200 megohms. The resistor is the total resistance of electrostatic overcurrent. The capacitance of the human body is generally 200pF, the resistance of the human body is 10 kilo ohm, the resistance of the resistor 401 is 330 mega ohm, the electrostatic pre-release is basically completed after 3 seconds according to the RC curve, and the residual voltage is less than 100 volts.

And fourthly, continuously pressing the touch ball 101 to drive the stroke rod 202 to continuously do stroke motion, enabling the permanent magnet 302 on the stroke rod 202 to leave the normally closed reed pipe 301 to close the normally closed reed pipe 301, and at the moment, directly grounding the human body to completely release the static electricity of the human body (releasing residual voltage, wherein the discharge time is less than 0.08 second).

After the hands are released, the travel rod 202 and the touch ball 101 are driven to reset under the action of the spring 201, and the next operation of eliminating the static electricity of the human body is waited.

Further, an nth reed switch and a resistor can be arranged before the normally closed reed switch 301 in the stroke of the permanent magnet, and n is the number of times of pre-discharge. The pre-discharge is performed to further reduce the shock to the human body when the static electricity is discharged, so the resistance should be set from large to small (according to the specific situation, it can be selected from large to small at 1 mega ohm-1000 mega ohm), for example, 3 times of pre-discharge is set, and the resistance can be set to 100 mega ohm, 50 mega ohm, 1 mega ohm.

FIG. 3 is a circuit diagram of a serial indicator light according to the present invention. The power supply E, the reed switch and the LED loop are used for indicating the successful action of the reed switch through the LED, and the LED is an intrinsic safety explosion-proof indicator lamp.