Communication device special for gas and dust explosion-proof elevator
Through the elevator communication device designed with explosion-proof and intrinsic safety, the problems of traditional elevator communication devices are solved, and normal work under gas and dust explosion conditions is achieved, the help is simplified, the market cost is reduced, and the elevator communication standards is met, and a safe and economical solution is provided.
Patent Information
- Application Number
- CN202422363724.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-27
AI Technical Summary
The existing elevator explosion-proof communication devices are bulky and occupy space, and cannot work normally under gas and dust explosion conditions. There is also a lack of explosion-proof communication devices on the market that do not require modification of the elevator control system.
A communication device dedicated to gas and dust explosion-proof elevators is designed. The circuit board and safety grid are set in the explosion-proof box by using the design method of explosion-proofing combined with intrinsic safety. The horn, mark, call button and microphone are set in the intrinsic safety grid. Current limiting and voltage limiting are performed through the Zener safety grid to realize an intrinsic safety circuit.
It simplifies the operation process of elevator calls, reduces market costs, complies with the requirements of GB7588 standards, improves the convenience of elevator calls, fills the market gap, and provides a safe and economical way to ask for help.
Smart Images
Figure CN223219125U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of safety equipment, in particular to a communication device dedicated to gas and dust explosion-proof elevators. Background Art
[0002] With the accelerating urbanization of today's society, elevators have become a necessity in daily life and work, and elevator safety has always been a focus within the elevator industry. In addition to improvements to elevator suspension technology, the elevator's explosion-proof communication system is a crucial component. In the event of an elevator accident, the ability for trapped personnel to immediately communicate with the outside world through the elevator's explosion-proof communication system undoubtedly greatly increases the timeliness of rescue and the likelihood of survival. However, ensuring that the elevator's explosion-proof communication system can function effectively even under extreme operating conditions is a key concern for those skilled in the field. Traditional intercoms with explosion-proof structures are bulky and space-consuming, failing to meet the regulatory requirements for elevator communication. There is an urgent need to design an explosion-proof communication system that can be installed without modifying the existing elevator control system structure, simplifying the way trapped personnel can call for help, and ensuring that the communication system can function effectively even in gas and dust explosions.
[0003] It is worth noting that in the field of safety technology, devices and equipment are divided into intrinsically safe and flameproof types. Flameproof type definition: (1) An electrical equipment enclosure that can withstand the explosion pressure of an internal explosive gas mixture and prevent the internal explosion from spreading to the explosive mixture around the enclosure (I zone explosion-proof technology). (2) Dangerous gases are allowed to enter the flameproof enclosure, and an explosion may occur inside the enclosure, but the enclosure must have sufficient strength; and each enclosure joint must have a sufficiently long meshing length and a sufficiently small gap to ensure that the internal explosion will not pass through the flameproof joint surface and cause an explosion in the external environment. (3) Gap explosion-proof technology relies on gaps and meshing lengths to achieve the effects of cooling and extinguishing flames. Intrinsically safe type definition: (1) Any electric spark or any thermal effect generated under the conditions specified in the standard (including normal operation and specified fault conditions) cannot ignite the circuit in the specified explosive gas environment (0 / I zone explosion-proof technology). (2) It is a "safe" technology that uses the suppression of ignition source energy as an explosion-proof means. It is required that the sparks or thermal effects that may be generated by the equipment during normal operation or failure are less than the minimum ignition energy and auto-ignition temperature of the explosive gas, respectively. (3) Intrinsically safe technology is actually a low-power design technology. Therefore, it is well suited for industrial automation instruments. Utility Model Content
[0004] The purpose of the present utility model is to overcome the shortcomings of the existing technology and provide a communication device dedicated to gas and dust explosion-proof elevators, so as to realize the replacement and installation of the communication device without changing the structure of the current elevator control system, simplify the way for trapped people to call for help, reduce the market cost of the elevator communication device, and fill the market gap for explosion-proof elevator communication devices.
[0005] In order to achieve the above-mentioned purpose, a communication device dedicated to gas and dust explosion-proof elevators is designed, comprising: a circuit board and a safety barrier arranged in an explosion-proof box; a speaker, a mark, a call button and a microphone arranged in an intrinsically safe box; an emergency power supply is also provided in the explosion-proof box, and the emergency power supply is connected to an external power supply line; the circuit boards include a machine room intercom circuit board, a car intercom circuit board, a car top intercom circuit board and a pit intercom circuit board, each intercom circuit board is connected to the emergency power supply and outputs R and L signals respectively through the signal output terminal; each intercom circuit board is connected to the corresponding Zener safety barrier through a signal line, and the Zener safety barrier outputs a safe intrinsically safe signal after current and voltage limiting processing on the signal, and each Zener safety barrier is connected to the corresponding intercom microphone and receiver through a signal line.
[0006] The communication device dedicated to gas and dust explosion-proof elevators provided by the present invention also has other technical features, wherein the SP+ and SP- ports of each intercom circuit board are connected to the input and output of the Zener safety barrier to access the speaker.
[0007] The communication device dedicated to gas and dust explosion-proof elevators provided by the present invention also has other technical features, wherein the MC+ and MC- ports of each intercom circuit board are connected to the input and output of the Zener safety barrier to access the speaking microphone.
[0008] The communication device dedicated to gas and dust explosion-proof elevators provided by the present invention also has other technical features, wherein the K1+ and COM1- ports of each intercom circuit board are connected to the input and output of the Zener safety barrier to access the answer key.
[0009] The communication device dedicated to gas and dust explosion-proof elevators provided by the present invention also has other technical features, wherein the K2+ and COM2- ports of each intercom circuit board are connected to the input and output of the Zener safety barrier to access the call key.
[0010] Compared with the prior art, the utility model has the following advantages:
[0011] By combining explosion-proof and intrinsically safe design, this innovative improvement to the traditional explosion-proof elevator five-party intercom system has been made. This simplifies the operational process for elevator intercoms, improves their ease of use, and further complies with the GB7588 standard for elevator communications. It also overcomes the bulky and space-consuming issues inherent in traditional explosion-proof intercoms. This new design eliminates the need for structural modifications to existing elevator control systems, reducing market costs and simplifying the process of sending distress signals for those trapped in an elevator. Furthermore, this design fills a gap in the market for explosion-proof intercom equipment, providing users with a safe and economical solution. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 , is a composite explosion-proof structure diagram of the utility model explosion-proof intercom;
[0013] Figure 2 ,yes Figure 1 The electrical schematic diagram of the explosion-proof intercom with structure;
[0014] In the figure: 1. Flameproof box, 2. Intrinsically safe box, 3. AC220V power supply, 4. Emergency power supply, 4.1 Input power supply, 4.2 Output power supply, 5. Machine room intercom circuit board, 5.1 Safety barrier one, 5.2 Machine room intercom microphone and handset, 6. Car intercom circuit board, 6.1 Safety barrier two, 6.2 Car intercom microphone and handset, 7. Car top intercom circuit board, 7.1 Safety barrier three, 7.2 Car top intercom microphone and handset, 8. Pit intercom circuit board, 8.1 Safety barrier four, 8.2 Pit intercom microphone and handset, 9. Duty room intercom, 10. Explosion-proof junction box. DETAILED DESCRIPTION
[0015] In order to make the purpose, principle and structure of the present invention more clear, it is further described below with reference to the accompanying drawings and specific embodiments.
[0016] See also Figure 1After the external AC220V power supply 3 enters the emergency power supply 4 in the explosion-proof box 1, the emergency power supply 4 outputs a DC12V power supply after transformation and rectification, and the DC12V power supply is respectively provided to the machine room intercom circuit board 5, the car intercom circuit board 6, the car top intercom circuit board 7, and the pit intercom circuit board 8. Then the R and L signals output by the machine room intercom circuit board 5 enter the Zener safety barrier 1 5.1, and after the current and voltage limiting of the Zener safety barrier 1 5.1, the output signals R and L are provided to the intrinsically safe machine room intercom microphone and earpiece 5.2 respectively; similarly, the DC12V power supply enters the car intercom circuit board 6, and then the signals R and L output by the car intercom circuit board 6 enter the Zener safety barrier 2 6.1, and after the limiting of the Zener safety barrier 2 6.1 After current and voltage limiting, the output signals R and L are intrinsically safe and provided to the microphone and receiver 6.2 of the intrinsically safe car intercom. The 12V DC power supply enters the car top intercom circuit board 7. The output signals R and L enter the Zener barrier 3 7.1. After current and voltage limiting, the output signals R and L are intrinsically safe and provided to the microphone and receiver 7.2 of the intrinsically safe car top intercom. The 12V DC power supply enters the pit intercom circuit board 8. The output signals R and L enter the Zener barrier 4 8.1. After current and voltage limiting, the output signals R and L are intrinsically safe and provided to the microphone and receiver 8.2 of the intrinsically safe pit intercom. The emergency power supply 4, circuit board, and safety barrier are all housed in the explosion-proof enclosure 1. The wiring between the safety barrier and the microphone and receiver passes through the intrinsically safe enclosure 2. The circuit board is also directly connected to the duty room intercom 9. The wiring between the above-mentioned safety barrier 2 6.1 and the microphone and receiver 6.2 of the car intercom, between the safety barrier 3 7.1 and the microphone and receiver 7.2 of the car top intercom, and between the safety barrier 4 8.1 and the microphone and receiver 8.2 of the pit intercom all pass through the explosion-proof junction box 10.
[0017] See also Figure 2 , SPK represents the intercom speaker, MC represents the intercom microphone, K1 represents the intercom answer button, K2 represents the intercom call button, the safety barriers at the speaker and microphone ends are output Zener safety barriers, and the safety barriers at the answer button and call button are input Zener safety barriers.
[0018] See also Figure 2 Each intercom motherboard is wired with the SP+ and SP- terminals connected to the safety barrier input and output for the speaker, while the MC+ and MC- terminals connect to the safety barrier input and output for the speaker microphone. K1+ and COM1- terminals connect to the safety barrier input and output for the answer button, while K2+ and COM2- terminals connect to the safety barrier input and output for the call button. Current and voltage limiting via the Zener barrier ensure intrinsic safety.
[0019] It is worth mentioning that:
[0020] The explosion-proof intercom of the utility model is specially used in elevators. Different from the traditional one-way intercom, when one party is speaking, the other party can also speak at the same time. Conversely, the other party can also listen to the content of the other party's conversation while speaking. Therefore, it also meets the requirements of GB7588 for elevator conversations.
[0021] This new explosion-proof intercom adopts a composite explosion-proof (flameproof + intrinsically safe) structure. By separating the intercom's circuit board, speaker, label, call button, microphone, and other components, they are rationally allocated based on actual conditions. Taking into account factors such as power, capacitance, inductance, voltage, and current, the circuit board and safety barrier are placed in a flameproof box, while the speaker, label, call button, and microphone are placed in an intrinsically safe box.
[0022] This utility model utilizes an intrinsically safe circuit through the combination of a flameproof enclosure, an intrinsically safe enclosure, and a safety barrier, achieving the desired protection. By limiting the parameters of the intercom circuit and implementing protective measures to limit the spark discharge energy and heat generated by the circuit, the sparks and heat generated during normal operation and specified fault conditions cannot ignite explosive mixtures in the surrounding environment. This achieves electrical explosion protection because the circuit itself is explosion-proof and inherently safe. Because the intrinsically safe intercom circuit is inherently safe, the sparks, arcs, and heat generated cannot ignite explosive mixtures in the surrounding environment. Therefore, intrinsically safe electrical equipment does not require a dedicated explosion-proof enclosure, reducing its size and weight and simplifying its structure. Furthermore, transmission lines for intrinsically safe electrical equipment can use rubberized and bare wires, saving significant amounts of cable. Therefore, intrinsically safe electrical equipment offers advantages such as safety and reliability, simple structure, compact size, light weight, low cost, and easy manufacturing and maintenance, making it an ideal explosion-proof electrical equipment. However, the maximum output power of intrinsically safe electrical equipment is limited to approximately 25W, limiting its scope of application. Intrinsically safe electrical equipment is categorized into two types: single-circuit and composite. Single-circuit intrinsically safe electrical equipment refers to equipment where all circuits are intrinsically safe, such as portable instruments, which are mostly single-circuit. Composite intrinsically safe electrical equipment refers to equipment where some circuits are intrinsically safe and others are non-intrinsically safe, such as dispatch telephone systems.
[0023] The above description is only a specific implementation method of this utility model, but the protection scope of this utility model is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by this utility model, can make equivalent substitutions or changes based on the technical solutions and new concepts of this utility model, which should be covered by the protection scope of this utility model.
Claims
1. A communication device for gas and dust explosion-proof elevators, characterized in that include Circuit boards and safety barriers installed in explosion-proof boxes; Speaker, label, call button and microphone installed in the intrinsically safe box; The flameproof box is also provided with an emergency power supply, which is connected to an external power supply circuit; The circuit boards include a machine room intercom circuit board, a car intercom circuit board, a car top intercom circuit board and a pit intercom circuit board. Each intercom circuit board is connected to an emergency power supply and outputs R and L signals through a signal output terminal. Each intercom circuit board is connected to the corresponding Zener safety barrier through a signal line. After the Zener safety barrier limits the current and voltage of the signal, it will output a safe intrinsically safe signal. Each Zener safety barrier is connected to the corresponding intercom microphone and receiver through a signal line.
2. A communication device for gas and dust explosion-proof elevators according to claim 1, characterized in that The SP+ and SP- ports of each intercom circuit board are connected to the input and output of the Zener safety barrier to access the speaker.
3. A communication device for gas and dust explosion-proof elevators according to claim 1, characterized in that The MC+ and MC- ports of each intercom circuit board are connected to the input and output of the Zener safety barrier to access the speaking microphone.
4. A communication device for gas and dust explosion-proof elevators according to claim 1, characterized in that The K1+ and COM1- ports of each intercom circuit board are connected to the input and output of the Zener safety barrier to access the answer key.
5. A communication device for gas and dust explosion-proof elevators according to claim 1, characterized in that The K2+ and COM2- ports of each intercom circuit board are connected to the input and output of the Zener barrier to access the call button.