Ventilation system suitable for explosion danger shady and cool warehouse

Abstract

The utility model discloses a ventilation system suitable for the inside of an explosion-danger shady and cool warehouse, which comprises a power supply, a combustible gas alarm controller, a combustible gas detection system, a main ventilation pipeline and an air-conditioning air feeder which are arranged in the explosion-proof shady and cool warehouse, and further comprises a double-speed main fan and a single-speed standby fan, the main ventilation pipeline is connected with a standby ventilation pipeline through a tee joint, the double-speed main fan is arranged on the main ventilation pipeline, the single-speed standby fan is arranged on the standby ventilation pipeline, the main ventilation pipeline is provided with a first electric valve, and the standby ventilation pipeline is provided with a second electric valve. The combustible gas alarm controller is electrically connected with the double-speed main fan and the standby accident fan through a secondary loop, the power supply is respectively connected with the air conditioner blower, the double-speed main fan and the single-speed standby fan through a main loop, and accident operation buttons of the double-speed main fan are arranged inside and outside the anti-explosion shady and cool storage. According to the utility model, the energy consumption is reduced, and the accident linkage performance of the main exhaust fan and the standby exhaust fan is improved.

Description

Technical Field

[0001] The present application relates to the technical field of fan control in pharmaceutical factories, and in particular to a ventilation system suitable for use in explosion-hazardous cool warehouses. Background Art

[0002] According to the requirements of the "Design Code for Heating, Ventilation and Air Conditioning of Industrial Buildings" GB50019-2015 and the "Design Code for Heating, Ventilation and Air Conditioning of Chemical Industry" HG / T 20698-2009, for places where a large amount of toxic gas, dangerous gas or dust may be suddenly released, an emergency ventilation system should be set up according to the process design requirements. When the normal ventilation volume has met the accident ventilation volume, there is no need to set up an additional accident ventilation system. However, for explosion-hazardous cool storage, air-conditioning fans need to be configured for temperature control. If the normal ventilation is considered according to the full air volume to meet the accident, it will greatly increase energy consumption. Therefore, the existing technology has the following defects:

[0003] 1. The existing single-speed fan has high energy consumption.

[0004] 2. The existing exhaust system has control buttons for the active and standby fans respectively, which fails to truly realize the switching control of the main and standby fans.

[0005] 3. Explosion-proof cool storage is usually as airtight as possible to facilitate rapid ventilation. Summary of the invention

[0006] The utility model aims to provide a ventilation system suitable for explosion-hazardous cool warehouses, which has a simple structure, improves the accident linkage performance of the main fan and the standby fan, reduces energy consumption, and makes the clean area of ​​the pharmaceutical factory run safer.

[0007] The purpose of the utility model adopts the following technical solutions:

[0008] A ventilation system suitable for explosion-hazardous cool storage, comprising a power supply, a combustible gas alarm controller, a combustible gas detection system, a main ventilation duct and an air-conditioning blower arranged in the explosion-proof cool storage, and also comprising a two-speed main blower and a single-speed standby blower. The main ventilation duct is connected to the standby ventilation duct through a tee, the two-speed main blower is arranged on the main ventilation duct, the single-speed standby blower is arranged on the standby ventilation duct, the main ventilation duct is provided with a first electric valve, and the standby ventilation duct is provided with a second electric valve. The combustible gas alarm controller is electrically connected to the two-speed main blower and the standby emergency blower through a secondary circuit, the power supply is electrically connected to the air-conditioning blower, the two-speed main blower and the single-speed standby blower respectively through the main circuit, and an emergency operation button for the two-speed main blower is provided inside and outside the explosion-proof cool storage.

[0009] Furthermore, the power supply includes a working power supply and a backup power supply, and a dual power supply switch is provided between the working power supply and the backup power supply.

[0010] Furthermore, the dual-speed main fan is electrically connected to the first electric valve, and the single-speed standby fan is electrically connected to the second electric valve.

[0011] Furthermore, the main circuit includes a power bus, a first circuit breaker QF1, a low-speed operation contactor KM1, a low-speed operation thermal relay KH1, a high-speed operation thermal relay KH2, a high-speed operation contactor KM2 arranged outside the explosion-proof area, a high-speed operation contactor KM3 arranged in the explosion-proof area, a second circuit breaker QF2, a third circuit breaker QF3, a standby fan contactor KM4 and a standby fan thermal relay KH3,

[0012] The input ends of the first circuit breaker QF1, the second circuit breaker QF2 and the third circuit breaker QF3 are all electrically connected to the power bus. The output end of the first circuit breaker QF1 is electrically connected to the dual-speed main fan through the main contact of the low-speed operation contactor KM1 and the coil winding of the low-speed operation thermal relay KH1. The coil winding of the low-speed operation thermal relay KH1 is also electrically connected to the main contact of the high-speed operation contactor KM3 arranged in the explosion-proof area. The output end of the first circuit breaker QF1 is electrically connected to the dual-speed main fan through the main contact of the high-speed operation contactor KM2 arranged outside the explosion-proof area and the coil winding of the high-speed operation thermal relay KH2; the output end of the third circuit breaker QF3 is electrically connected to the single-speed standby fan through the main contact of the standby fan contactor KM4 and the coil winding of the standby fan thermal relay KH3; the output end of the second circuit breaker QF2 is electrically connected to the air-conditioning blower.

[0013] Furthermore, the secondary circuit includes a first linkage control unit and a second linkage control unit, the input end of the first linkage control unit is connected to the output end of the first overcurrent protection unit FU1, and the input end of the first overcurrent protection unit FU1 is connected to the phase line L of the power supply, and is used to generate a control signal according to the control instructions issued by the combustible gas alarm controller and the on-site button box, and perform local or linkage control on the dual-speed main fan;

[0014] The input end of the second linkage control unit is connected to the output end of the second overcurrent protection unit FU2, and the input end of the second overcurrent protection unit FU2 is electrically connected to the third circuit breaker QF3, and is used to generate a control signal according to the control instruction issued by the combustible gas alarm controller to perform linkage control on the single-speed standby fan.

[0015] Furthermore, the first linkage control unit includes a first emergency stop button SB-1JS, a low-speed manual start button 1SB, a low-speed manual stop button 1SS, an in-area high-speed stop button 3SS, an in-area high-speed start button 3SB, an out-of-area high-speed start button 2SB, an out-of-area high-speed stop button 2SS, a low-speed operation contactor KM1, a low-speed operation thermal relay KH1, a combustible gas detection linkage intermediate relay COC-KA, a high-speed operation contactor KM2 arranged outside the explosion-proof area, a high-speed operation contactor KM3 arranged within the explosion-proof area, and a high-speed operation thermal relay KH2; the input end of the first emergency stop button SB-1JS is electrically connected to the output end of the first overcurrent protection unit FU1, and the output end of the first emergency stop button SB-1JS is connected in series with a normally closed switch of the low-speed manual stop button 1SS, a normally closed switch of the low-speed manual start button 1SB The first circuit is connected in series with the normally closed switch of the high-speed start button 2SB outside the area, the normally closed switch of the high-speed start button 3SB inside the area, and then connected to the neutral line N of the power supply through the normally closed auxiliary contact of the high-speed operation contactor KM2 arranged outside the explosion-proof area, the normally closed auxiliary contact of the high-speed operation contactor KM3 arranged in the explosion-proof area, the normally closed contact of the combustible gas detection linkage intermediate relay COC-KA, the normally closed contact of the low-speed operation thermal relay KH1 and the coil winding of the low-speed operation contactor KM1; the second circuit is connected in series with the normally closed switch of the high-speed stop button 2SS outside the area, the normally open switch of the high-speed start button 2SB outside the area, the normally closed switch of the high-speed stop button 3SS inside the area, and then connected to the neutral line N of the power supply through the normally closed auxiliary contact of the low-speed operation contactor KM1, the normally closed contact of the high-speed operation thermal relay KH2 and the coil winding of the high-speed operation contactor KM2 arranged in the explosion-proof area;The normally open auxiliary contact of the low-speed operation contactor KM1 is connected in parallel to the low-speed manual start button 1SB, the normally open switch of the high-speed start button 3SB in the area and the normally open auxiliary contact of the high-speed operation contactor KM2 arranged in the explosion-proof area are connected in parallel to the normally open switch of the high-speed start button 2SB outside the area, the normally open auxiliary contact input end of the low-speed operation contactor KM1 is electrically connected to the first emergency stop button SB-1JS, the normally open auxiliary contact output end of the low-speed operation contactor KM1 is connected to the neutral line N of the power supply, and the combustible gas detection linkage intermediate relay COC -KA's normally open contact input end is electrically connected to the first emergency stop button SB-1JS, and its output end is electrically connected to the normally closed auxiliary contact output end of the low-speed operation contactor KM1, the normally closed auxiliary contact input end of the low-speed operation contactor KM1 is electrically connected to the normally open contact output end of the combustible gas detection linkage intermediate relay COC-KA, and the normally closed auxiliary contact output end of the low-speed operation contactor KM1 is connected to the neutral line N of the power supply via the normally open auxiliary contact of the high-speed operation contactor KM2 arranged in the explosion-proof area and the coil winding of the high-speed operation contactor KM3 arranged in the explosion-proof area. ;

[0016] Furthermore, the first linkage control unit also includes a first low-speed operation indicator light 1RD1 and a second low-speed operation indicator light 1RD2, a first high-speed operation indicator light 2RD1, a second high-speed operation indicator light 2RD2 and a third high-speed operation indicator light 2RD3, the first low-speed operation indicator light 1RD1 and the second low-speed operation indicator light 1RD2 are both arranged in the explosion-proof area, the first high-speed operation indicator light 2RD1 is arranged outside the explosion-proof area, and the second high-speed operation indicator light 2RD2 is arranged in the explosion-proof area.

[0017] Further, the second linkage control unit includes a second emergency stop button SB-2JS, a standby fan start button SB-1SB, a standby fan stop button SB-1SS, a standby fan contactor KM4 and a standby fan thermal relay KH3;

[0018] The input end of the second emergency stop button SB-2JS is electrically connected to the output end of the third overcurrent protection unit FU3, and the output end of the second emergency stop button SB-2JS is connected in series with the normally closed auxiliary contact of the low-speed operation contactor KM1 and the normally closed auxiliary contact of the high-speed operation contactor KM2 set in the explosion-proof area. The output end of the high-speed operation contactor KM2 set in the explosion-proof area is electrically connected to the neutral line N of the power supply after passing through the combustible gas detection linkage intermediate relay COC-KA contact and the coil winding of the standby fan contactor KM4, and the other way is connected to the neutral line N of the power supply through the combustible gas detection linkage intermediate relay COC-KA contact and the coil winding of the standby fan contactor KM4. The normally closed switch of the standby fan stop button SB-1SS, the normally open switch of the standby fan start button SB-1SB, and the coil winding of the standby fan contactor KM4 are electrically connected to the neutral line N of the power supply, the normally open auxiliary contact of the standby fan contactor KM4 is connected in parallel to the standby fan start button SB-1SB, the normally open contact input end of the standby fan thermal relay KH3 is electrically connected to the output end of the high-speed running contactor KM2 arranged in the explosion-proof area, and the output end of the normally open contact of the standby fan thermal relay KH3 is connected to the neutral line N of the power supply.

[0019] Furthermore, the second linkage control unit also includes an overload alarm intermediate relay KA1, an alarm release button JC-SB, an overload alarm release intermediate relay KA2, a standby operation indicator light 1RD, an overload alarm indicator light YD and an overload sound alarm HA.

[0020] The input end of the standby operation indicator light 1RD is electrically connected to the auxiliary contact of the standby fan contactor KM4, the output end of the standby operation indicator light 1RD is connected to the neutral line N of the power supply, the coil winding of the load alarm intermediate relay KA1 is electrically connected between the normally open contact of the standby fan thermal relay KH3 and the neutral line N of the power supply, the normally open contact input end of the overload alarm intermediate relay KA1 is electrically connected to the output end of the high-speed operation contactor KM2 arranged in the explosion-proof area, the first path of the output end of the overload alarm intermediate relay KA1 is connected to the neutral line N of the power supply through the load alarm indicator light YD, the second path is connected to the neutral line N of the power supply after passing through the normally closed contact of the load alarm release intermediate relay KA2 and the overload sound alarm HA, the third path is connected to the neutral line N of the power supply after passing through the normally open switch of the sound alarm release button JC-SB and the coil winding of the overload alarm release intermediate relay KA2, and the normally open contact of the overload alarm release intermediate relay KA2 is connected in parallel to the sound alarm release button JC-SB.

[0021] Furthermore, a third linkage control unit is provided between the first electric valve and the dual-speed main fan, and a fourth linkage control unit is provided between the second electric valve and the single-speed standby fan.

[0022] Furthermore, the status signals and fault signals of the dual-speed main fan and the standby emergency fan are fed back to the combustible gas alarm controller through the secondary circuit.

[0023] The beneficial effects of the utility model are as follows: the main ventilation duct is connected to a backup ventilation duct, and the main ventilation duct is equipped with a two-speed main fan. In non-accident states, the two-speed main fan is turned on at a low speed, and in an accident state, it is linked to high-speed operation; the backup ventilation duct is equipped with a single-speed backup fan as an emergency backup; under normal circumstances, the two-speed main fan runs at a low speed, which reduces the energy consumption of the ventilation system. The two-speed main fan runs at a high speed in an accident, which meets the accident ventilation needs. After the main fan fails, the single-speed backup fan is started to meet the main-backup switching requirements. At the same time, a combustible gas detection system is set in the explosion-proof cool warehouse. The air-conditioning blower is usually used for the temperature control of the cool warehouse. When an accident occurs, the combustible gas detection system detects the combustible gas signal and also links the air-conditioning blower to run, so that the air-conditioning blower is also used as emergency air supply, which improves the ventilation effect.

[0024] The cool storage needs to be as airtight as possible to reduce energy consumption. The first and second electric valves are installed on the main ventilation duct and the backup ventilation duct. The first electric valve is controlled by the operation signal of the two-speed main fan and opens and closes with the two-speed main fan. The first electric valve is controlled by the low-speed and high-speed operation signals. Regardless of whether the two-speed main fan is running at low or high speed, the first electric valve needs to be opened. The second electric valve is controlled by the single-speed backup fan operation signal and opens and closes with the single-speed backup fan.

[0025] The two-speed main fan is provided with emergency operation buttons inside and outside the dangerous area respectively. The low-speed working condition is not used for accidents and only one button is needed. The single-speed standby fan is started only when it receives a combustible gas alarm signal and the two-speed main fan is not running due to a fault. There is no need to set a control button on site, which minimizes the electrical equipment in the explosion-proof area and improves the safety performance of the ventilation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of this specific embodiment 1;

[0027] Figure 2 This is a circuit diagram of the main circuit in this specific embodiment 1;

[0028] Figure 3 This is a control principle diagram of the dual-speed main fan in this specific embodiment 1;

[0029] Figure 4 The power supply circuit of the dual-speed main fan in the specific embodiment 1;

[0030] Figure 5 This is a control principle diagram of the single-speed standby fan in this specific embodiment 1;

[0031] Figure 6 This is a control principle diagram of the combustible gas detection system linkage start-up in this specific embodiment 1;

[0032] Figure 7 This is a schematic diagram of the linkage control between the first electric valve and the dual-speed main fan in the specific embodiment 1;

[0033] Figure 8 This is a schematic diagram of the linkage control between the second electric valve and the single-speed standby fan in this specific embodiment 1. DETAILED DESCRIPTION

[0034] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0035] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present application in a schematic manner. Therefore, the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] This specific embodiment 1:

[0037] See also Figures 1 to 8As shown, a ventilation system suitable for explosion-hazardous cool storage includes a power supply, a combustible gas alarm controller, a combustible gas detection system, a two-speed main fan 1, a single-speed standby fan 2, a main ventilation duct 3 and an air-conditioning blower arranged in the explosion-proof cool storage, the two-speed main fan 1 and the single-speed standby fan 2 are arranged on the roof of the explosion-proof cool storage, the main ventilation duct 3 is connected with the standby ventilation duct 4 through a tee, the two-speed main fan 1 is arranged on the main ventilation duct 3, the single-speed standby fan 2 is arranged on the standby ventilation duct 4, the main ventilation duct 3 is provided with a first electric valve 5, the standby ventilation duct 4 is provided with a second electric valve 6, the two-speed main fan 1 is electrically connected to the first electric valve 5, the single-speed standby fan 2 is electrically connected to the second electric valve 6, and the main ventilation duct 3 and the standby ventilation duct 4 are both provided with conical hoods. The combustible gas alarm controller is electrically connected to the two-speed main fan 1 and the standby emergency fan 2 through the secondary circuit, and the power supply is electrically connected to the air-conditioning blower, the two-speed main fan 1 and the single-speed standby fan 2 through the main circuit. The accident operation button of the two-speed main fan 1 is provided inside and outside the explosion-proof cool storage. The secondary circuit is used to generate a control signal according to the control instruction issued by the combustible gas alarm controller, and the main circuit realizes the linkage control of the air-conditioning blower, the two-speed main fan 1, the first electric valve 5, the second electric valve 6 and the single-speed standby fan 2 according to the control signal. The state signal and fault signal of the two-speed main fan 1 and the standby emergency fan 2 are fed back to the combustible gas alarm controller through the secondary circuit.

[0038] The power supply includes a working power supply and a backup power supply, providing a main and backup power supply. The working power supply is an AC power supply. A dual power supply switching switch is provided between the working power supply and the backup power supply. In this specific embodiment: the power control box incoming line switch adopts a dual power supply switching switch, and the dual power supply switching switch adopts a PC-level AC-33B ATS with a disconnection isolation function.

[0039] The main circuit includes a power bus, a first circuit breaker QF1, a low-speed operation contactor KM1, a low-speed operation thermal relay KH1, a high-speed operation thermal relay KH2, a high-speed operation contactor KM2 arranged outside the explosion-proof area, a high-speed operation contactor KM3 arranged in the explosion-proof area, a second circuit breaker QF2, a third circuit breaker QF3, a standby fan contactor KM4, a fourth circuit breaker QF3 and a standby fan thermal relay KH3.

[0040] The input ends of the first circuit breaker QF1, the second circuit breaker QF2, the third circuit breaker QF3 and the fourth circuit breaker QF4 are all electrically connected to the power bus, and the output end of the first circuit breaker QF1 is electrically connected to the motor F01 of the dual-speed main fan 1 through the main contact of the low-speed operation contactor KM1 and the coil winding of the low-speed operation thermal relay KH1. The low speed of the dual-speed main fan 1 is electrically connected to the on-site button box K-F01 d through a control line, and the coil winding of the low-speed operation thermal relay KH1 is also electrically connected to the main contact of the high-speed operation contactor KM3 arranged in the explosion-proof area. The output end of the first circuit breaker QF1 is electrically connected to the motor F01 of the dual-speed main fan 1 through the main contact of the high-speed operation contactor KM2 arranged outside the explosion-proof area and the coil winding of the high-speed operation thermal relay KH2. The high speed of the dual-speed main fan is respectively connected to the indoor button box K-F01 a and the outdoor button box K-F01 b through a control line. b Electrical connection: A low-speed red operating indicator light and a high-speed red operating indicator light of a dual-speed main fan are provided on the power control box surface. The dual-speed main fan 1 is electrically connected to the first electric valve DDF-F01 through a control line.

[0041] The output end of the third circuit breaker QF3 is electrically connected to the motor F02 of the single-speed standby fan 2 through the main contact of the standby fan contactor KM4 and the coil winding of the standby fan thermal relay KH3. The single-speed standby fan 2 is electrically connected to the second electric valve DDF-F02 through a control line. The power control box is provided with a yellow overload alarm indicator light for the single-speed standby fan 2, a red standby operation indicator light, a standby fan start button, a standby fan stop button and a sound alarm release button.

[0042] The output end of the second circuit breaker QF2 is electrically connected to the motor K01 of the air conditioner blower 7, and the control of the electric valve on the air conditioner duct is connected by the air conditioner equipment. The fourth circuit breaker QF4 is connected as a backup device.

[0043] The secondary circuit includes a first linkage control unit and a second linkage control unit, wherein the input end of the first linkage control unit is connected to the output end of the first overcurrent protection unit FU1, and the input end of the first overcurrent protection unit FU1 is connected to the phase line L of the power supply, and is used to generate a control signal according to the control instructions issued by the combustible gas alarm controller and the on-site button box, and perform local or linkage control on the dual-speed main fan;

[0044] The first linkage control unit includes an on-site button box K-F01 d, an indoor button box K-F01 a, an outdoor button box K-F01 b, a low-speed operation contactor KM1, a low-speed operation thermal relay KH1, a combustible gas detection linkage intermediate relay COC-KA, a high-speed operation contactor KM2 arranged outside the explosion-proof area, a high-speed operation contactor KM3 and a high-speed operation thermal relay KH2 arranged in the explosion-proof area; the on-site button box K-F01 d is provided with a first emergency stop button SB-1JS, a low-speed manual start button 1SB and a low-speed manual stop button 1SS, the indoor button box K-F01 a is provided with an in-area high-speed stop button 3SS and an in-area high-speed start button 3SB, the outdoor button box K-F01 b is provided with an out-of-area high-speed start button 2SB and an out-of-area high-speed stop button 2SS, and the accident operation buttons include an out-of-area high-speed start button 2SB, an out-of-area high-speed stop button 2SS, an in-area high-speed stop button 3SS and an in-area high-speed start button 3SB;

[0045] The input end of the first emergency stop button SB-1JS is electrically connected to the output end of the first overcurrent protection unit FU1, and the output end of the first emergency stop button SB-1JS is connected in series with the normally closed switch of the low-speed manual stop button 1SS, the normally open switch of the low-speed manual start button 1SB, the normally closed switch of the high-speed start button 2SB outside the area, and the normally closed switch of the high-speed start button 3SB within the area, and then sequentially through the normally closed auxiliary contact of the high-speed operation contactor KM2 set outside the explosion-proof area, the normally closed auxiliary contact of the high-speed operation contactor KM3 set within the explosion-proof area, and the combustible gas detection linkage intermediate The normally closed contact of the relay COC-KA, the normally closed contact of the low-speed operation thermal relay KH1 and the coil winding of the low-speed operation contactor KM1 are connected to the neutral line N of the power supply; the normally open auxiliary contact of the low-speed operation contactor KM1 is connected in parallel to the low-speed manual start button 1SB, and the output end of the first emergency stop button SB-1JS is connected in series with the normally closed switch of the high-speed stop button 2SS outside the area, the normally open switch of the high-speed start button 2SB outside the area, and the normally closed switch of the high-speed stop button 3SS within the area, and then sequentially through the normally closed auxiliary contact of the low-speed operation contactor KM1, the high-speed operation thermal relay KH The normally closed contact of 2 and the coil winding of the high-speed operation contactor KM2 arranged in the explosion-proof area are connected to the neutral line N of the power supply; the normally open switch of the high-speed start button 3SB in the area and the normally open auxiliary contact of the high-speed operation contactor KM2 arranged in the explosion-proof area are connected in parallel to the normally open switch of the high-speed start button 2SB outside the area, the normally open auxiliary contact input end of the low-speed operation contactor KM1 is electrically connected to the first emergency stop button SB-1JS, the normally open auxiliary contact output end of the low-speed operation contactor KM1 is connected to the neutral line N of the power supply, and the combustible gas detection linkage intermediate relay C The normally open contact input end of OC-KA is electrically connected to the first emergency stop button SB-1JS, and the output end is electrically connected to the normally closed auxiliary contact output end of the low-speed running contactor KM1. The input end of the normally closed auxiliary contact of the low-speed running contactor KM1 is electrically connected to the output end of the normally open contact of the combustible gas detection linkage intermediate relay COC-KA. The output end of the normally closed auxiliary contact of the low-speed running contactor KM1 is connected to the neutral line N of the power supply via the normally open auxiliary contact of the high-speed running contactor KM2 arranged in the explosion-proof area and the coil winding of the high-speed running contactor KM3 arranged in the explosion-proof area.

[0046] Possibly, the first linkage control unit further includes a first low-speed operation indicator light 1RD1 and a second low-speed operation indicator light 1RD2, a first high-speed operation indicator light 2RD1, a second high-speed operation indicator light 2RD2 and a third high-speed operation indicator light 2RD3, wherein the first low-speed operation indicator light 1RD1 and the second low-speed operation indicator light 1RD2 are both arranged in the explosion-proof area, the first high-speed operation indicator light 2RD1 is arranged outside the explosion-proof area, and the second high-speed operation indicator light 2RD2 is arranged in the explosion-proof area. The first low-speed operation indicator light 1RD1 is connected in series to the output end of the normally open auxiliary contact of the low-speed operation contactor KM1, the second low-speed operation indicator light 1RD1 is connected in parallel to the first low-speed operation indicator light 1RD1, and the first high-speed operation indicator light 2RD1, the second high-speed operation indicator light 2RD2 and the third high-speed operation indicator light 2RD3 are all connected in parallel to the coil winding of the high-speed operation contactor KM3 arranged in the explosion-proof area.

[0047] The input end of the second linkage control unit is connected to the output end of the second overcurrent protection unit FU2, and the input end of the second overcurrent protection unit FU2 is electrically connected to the third circuit breaker QF3, which is used to generate a control signal according to the control instruction issued by the combustible gas alarm controller to perform linkage control on the single-speed standby fan.

[0048] The second linkage control unit includes a second emergency stop button SB-2JS, a standby fan start button SB-1SB, a standby fan stop button SB-1SS, a standby fan contactor KM4, a standby fan thermal relay KH3, an overload alarm intermediate relay KA1, an alarm release button JC-SB, an overload alarm release intermediate relay KA2, a standby operation indicator light 1RD, an overload alarm indicator light YD and an overload sound alarm HA;

[0049] The input end of the second emergency stop button SB-2JS is electrically connected to the output end of the third overcurrent protection unit FU3, and the output end of the second emergency stop button SB-2JS is connected in series with the normally closed auxiliary contact of the low-speed operation contactor KM1 and the normally closed auxiliary contact of the high-speed operation contactor KM2 arranged in the explosion-proof area. The output end of the high-speed operation contactor KM2 arranged in the explosion-proof area is connected in series through the combustible gas detection linkage intermediate relay COC-KA contacts and then electrically connected to the neutral line N of the power supply after passing through the coil winding of the standby fan contactor KM4. The output end of the high-speed operation contactor KM2 arranged in the explosion-proof area is connected in series through the normally closed switch of the standby fan stop button SB-1SS and the standby fan start button S The normally open switch of B-1SB and the coil winding of the standby fan contactor KM4 are electrically connected to the neutral line N of the power supply, the normally open auxiliary contact of the standby fan contactor KM4 is connected in parallel to the standby fan start button SB-1SB, the input end of the standby operation indicator light 1RD is electrically connected to the auxiliary contact of the standby fan contactor KM4, the output end of the standby operation indicator light 1RD is connected to the neutral line N of the power supply, the normally open contact input end of the standby fan thermal relay KH3 is electrically connected to the output end of the high-speed operation contactor KM2 arranged in the explosion-proof area, and the output end of the normally open contact of the standby fan thermal relay KH3 is connected to the neutral line N of the power supply through the coil winding of the load alarm intermediate relay KA1.

[0050] The normally open contact input end of the overload alarm intermediate relay KA1 is electrically connected to the output end of the high-speed running contactor KM2 arranged in the explosion-proof area. The first path of the output end of the overload alarm intermediate relay KA1 is connected to the neutral line N of the power supply through the load alarm indicator light YD, the second path is connected to the neutral line N of the power supply after passing through the normally closed contact of the load alarm release intermediate relay KA2 and the overload sound alarm HA, and the third path is connected to the neutral line N of the power supply after passing through the normally open switch of the sound alarm release button JC-SB and the coil winding of the overload alarm release intermediate relay KA2. The normally open contact of the overload alarm release intermediate relay KA2 is connected in parallel to the sound alarm release button JC-SB.

[0051] The combustible gas detection system includes a combustible gas alarm controller outputting a gas alarm signal COC, a fifth overcurrent protection unit, a transformer TC and a combustible gas detection linkage intermediate relay COC-KA, and the transformer TC adopts AC220 / AC24V.

[0052] A third linkage control unit is provided between the first electric valve and the dual-speed main blower to realize linkage control. The third linkage control unit includes a third overcurrent protection unit FU3, a third test button SB-3JS, a third intermediate relay KA3 and a first electric valve operation indicator light 2RD. The input end of the third overcurrent protection unit FU3 is electrically connected to the phase line L of the power supply. The input end of the first electric valve is electrically connected to the output end of the third overcurrent protection unit FU3 through the normally open contact and normally closed contact of the third intermediate relay KA3. The output end of the first electric valve is electrically connected to the neutral line N of the power supply. The input end of the third test button SB-3JS is electrically connected to the third overcurrent protection unit FU3. The output end of the element FU3 is electrically connected, the output end of the third test button SB-3JS is connected in series with the first electric valve operation indicator light 2RD and then electrically connected to the neutral line N of the power supply, the auxiliary contacts of the low-speed operation contactor KM1 and the auxiliary contacts of the high-speed operation contactor KM3 arranged in the explosion-proof area are connected in parallel to the third test button SB-3JS, and the auxiliary contacts of the low-speed operation contactor KM1 and the auxiliary contacts of the high-speed operation contactor KM3 arranged in the explosion-proof area are electrically connected to the neutral line N of the power supply via the coil winding of the third intermediate relay KA3.

[0053] A fourth linkage control unit is provided between the second electric valve and the single-speed standby fan linkage to realize linkage control. The fourth linkage control unit includes a fourth overcurrent protection unit FU4, a fourth test button SB-4JS, a fourth intermediate relay KA4 and a second electric valve operation indicator light 3RD. The input end of the fourth overcurrent protection unit FU4 is electrically connected to the phase line L of the power supply. The input end of the first electric valve is electrically connected to the output end of the fourth overcurrent protection unit FU4 through the normally open contact and the normally closed contact of the fourth intermediate relay KA4. The input end of the fourth test button SB-4JS is electrically connected to the output end of the fourth overcurrent protection unit FU4. The output end of the fourth test button SB-4JS is electrically connected to the phase line L of the power supply after being connected in series with the second electric valve operation indicator light 2RD. The auxiliary contact of the standby fan contactor KM4 is connected in parallel to the fourth test button SB-3JS. The auxiliary contact of the standby fan contactor KM4 is electrically connected to the neutral line N of the power supply through the coil winding of the fourth intermediate relay KA4.

[0054] The first overcurrent protection unit FU1 , the second overcurrent protection unit FU2 , the third overcurrent protection unit FU3 , the fourth overcurrent protection unit FU4 , and the fifth overcurrent protection unit FU5 all use fuses.

[0055] Working principle:

[0056] 1. Under normal conditions, by pressing the low-speed manual start button 1SB of the on-site button box K-F01 d in the area, the low-speed operation contactor KM1 coil is connected to energize, and the auxiliary contacts of the low-speed operation contactor are self-retained. Usually, the two-speed main fan runs at a low speed, and the fresh air air conditioner has its own control. The control box of the air conditioner is operated to start the air conditioner, and the explosion-proof cool warehouse is operated normally. When it is necessary to shut down, by pressing the low-speed manual stop button 1SS of the on-site button box K-F01 d in the area, the low-speed operation contactor KM1 is disconnected, and the two-speed main fan is shut down.

[0057] 2. When personnel find an abnormality and need to make the dual-speed main fan run at high speed, they press the high-speed start button 2SB outside the area at the outdoor button box K-F01b outside the area or press the high-speed start button 3SB inside the area at the indoor button box K-F01a inside the area to disconnect the low-speed operation circuit, and at the same time, sequentially connect the high-speed operation contactor KM2 set in the explosion-proof area and the high-speed operation contactor KM3 set in the explosion-proof area, and the high-speed operation contactor KM2 set in the explosion-proof area is self-retained, and the dual-speed main fan enters the high-speed operation state at high speed. The high-speed operation contactor KM3 set in the explosion-proof area cannot be connected at the same time as the low-speed operation contactor KM1, and they are locked with each other;

[0058] 3. Regardless of whether the dual-speed main fan is running at low speed or high speed, if the thermal relay is overloaded, it will stop directly. At this time, if there is no combustible gas detection linkage intermediate relay COC-KA linkage signal, the exhaust fan will stop. If there is a combustible gas detection linkage intermediate relay COC-KA linkage, the single-speed standby fan will be activated.

[0059] 4. The single-speed standby fan does not run normally and is locked by the two-speed main fan. When the two-speed main fan is running, this single-speed standby fan cannot be started. When V is stopped, it can be started through the standby fan start button SB-1SB, or stopped through the standby fan stop button SB-1SS. When receiving the linkage signal of the combustible gas detection linkage intermediate relay COC-KA and the two-speed main fan is shut down due to an accident, the standby fan contactor KM is energized, the single-speed standby fan is enabled and self-maintained through the auxiliary contacts of the standby fan contactor. If the standby fan thermal relay KH has an overload signal again, the two-speed main fan will not be stopped, but will run with overload, and sound and light alarm will be issued through the overload alarm intermediate relay KA1. The sound alarm can be released through the sound alarm release button JC-SB connected to the load alarm release intermediate relay KA2. The light alarm cannot be released before the accident is eliminated;

[0060] 5. The first electric valve and the second electric valve receive the operation signal of the dual-speed main fan and the single-speed standby fan to open or close in linkage.

[0061] When the single-speed standby fan is running, the coil of the fourth intermediate relay KA4 is connected, and the valve opening interface of the second electric valve actuator is connected. When the fan stops, the coil of the fourth intermediate relay KA4 is disconnected, and the valve closing interface of the second electric valve actuator is connected through the normally closed contact output of the fourth intermediate relay KA4. For the first electric valve corresponding to the dual-speed main fan, the first electric valve is opened when operating at low speed or high speed.

[0062] That is, the dual-speed main fan in the utility model:

[0063] Manual operation under normal working conditions. When it needs to be turned on, just press the low-speed operation button in the button box in the explosion-proof cool warehouse;

[0064] When personnel find potential accident risks, they will operate the machine manually. Relevant specifications require that accident fans be equipped with accident operation buttons inside and outside the explosion-proof cool storage area. When potential risks are found, the high-speed operation button can be pressed at the indoor button box inside the area or the outdoor button box outside the area.

[0065] The combustible gas detection linkage of the combustible gas detection system is started, and the dual-speed main fan is linked to run at high speed. If the dual-speed main fan is in a low-speed running state at this time, it will be linked to exit the low-speed operation and then switch to high speed.

[0066] The single-speed standby fan in the utility model:

[0067] When the main two-speed main fan is running at low or high speed, this single-speed standby fan is locked and cannot be turned on. If the two-speed main fan is not running, this single-speed standby fan can be debugged or checked by the start and stop buttons on the distribution box; it is not necessary to enable this single-speed standby fan in normal conditions. In the event of an accident, after the combustible gas detection controller of the combustible gas detection system sends a linkage signal, this single-speed standby fan still does not run. At this time, if the two-speed main fan is overloaded or fails to start, this single-speed standby fan will be linked to start.

[0068] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. A ventilation system suitable for explosion-proof cool storage, comprising a power supply, a combustible gas alarm controller, a combustible gas detection system, a main ventilation duct and an air-conditioning blower arranged in the explosion-proof cool storage, characterized in that: It also includes a two-speed main fan and a single-speed standby fan. The main ventilation duct is connected to the standby ventilation duct through a tee. The two-speed main fan is arranged on the main ventilation duct, and the single-speed standby fan is arranged on the standby ventilation duct. The main ventilation duct is provided with a first electric valve, and the standby ventilation duct is provided with a second electric valve. The combustible gas alarm controller is electrically connected to the two-speed main fan and the standby emergency fan through a secondary circuit. The power supply is respectively connected to the air-conditioning blower, the two-speed main fan and the single-speed standby fan through the main circuit. Accident operation buttons of the two-speed main fan are provided inside and outside the explosion-proof cool storage.

2. The ventilation system for explosion-hazardous cool storage according to claim 1 is characterized in that: The power supply includes a working power supply and a backup power supply, and a dual power supply switching switch is provided between the working power supply and the backup power supply.

3. The ventilation system for explosion-hazardous cool storage according to claim 1 is characterized in that: The dual-speed main fan is electrically connected to the first electric valve, and the single-speed standby fan is electrically connected to the second electric valve.

4. The ventilation system for explosion-hazardous cool storage according to claim 1 is characterized in that: The main circuit includes a power bus, a first circuit breaker QF1, a low-speed operation contactor KM1, a low-speed operation thermal relay KH1, a high-speed operation thermal relay KH2, a high-speed operation contactor KM2 arranged outside the explosion-proof area, a high-speed operation contactor KM3 arranged in the explosion-proof area, a second circuit breaker QF2, a third circuit breaker QF3, a standby fan contactor KM4 and a standby fan thermal relay KH3, The input ends of the first circuit breaker QF1, the second circuit breaker QF2 and the third circuit breaker QF3 are all electrically connected to the power bus. The output end of the first circuit breaker QF1 is electrically connected to the dual-speed main fan through the main contact of the low-speed operation contactor KM1 and the coil winding of the low-speed operation thermal relay KH1. The coil winding of the low-speed operation thermal relay KH1 is also electrically connected to the main contact of the high-speed operation contactor KM3 arranged in the explosion-proof area. The output end of the first circuit breaker QF1 is electrically connected to the dual-speed main fan through the main contact of the high-speed operation contactor KM2 arranged outside the explosion-proof area and the coil winding of the high-speed operation thermal relay KH2; the output end of the third circuit breaker QF3 is electrically connected to the single-speed standby fan through the main contact of the standby fan contactor KM4 and the coil winding of the standby fan thermal relay KH3; the output end of the second circuit breaker QF2 is electrically connected to the air-conditioning blower.

5. The ventilation system for explosion-hazardous cool storage according to claim 4 is characterized in that: The secondary circuit includes a first linkage control unit and a second linkage control unit, wherein the input end of the first linkage control unit is connected to the output end of the first overcurrent protection unit FU1, and the input end of the first overcurrent protection unit FU1 is connected to the phase line L of the power supply, and is used to generate a control signal according to the control instructions issued by the combustible gas alarm controller and the on-site button box, and perform local or linkage control on the dual-speed main fan; The input end of the second linkage control unit is connected to the output end of the second overcurrent protection unit FU2, and the input end of the second overcurrent protection unit FU2 is electrically connected to the third circuit breaker QF3, and is used to generate a control signal according to the control instruction issued by the combustible gas alarm controller to perform linkage control on the single-speed standby fan.

6. The ventilation system for explosion-hazardous cool storage according to claim 5 is characterized in that: The first linkage control unit includes a first emergency stop button SB-1JS, a low-speed manual start button 1SB, a low-speed manual stop button 1SS, an in-area high-speed stop button 3SS, an in-area high-speed start button 3SB, an out-of-area high-speed start button 2SB, an out-of-area high-speed stop button 2SS, a low-speed operation contactor KM1, a low-speed operation thermal relay KH1, a combustible gas detection linkage intermediate relay COC-KA, a high-speed operation contactor KM2 arranged outside the explosion-proof area, a high-speed operation contactor KM3 arranged within the explosion-proof area, and a high-speed operation thermal relay KH2; the input end of the first emergency stop button SB-1JS is electrically connected to the output end of the first overcurrent protection unit FU1, and the first emergency stop button S The output end of B-1JS is connected in series with the normally closed switch of the low-speed manual stop button 1SS, the normally open switch of the low-speed manual start button 1SB, the normally closed switch of the high-speed start button 2SB outside the area, and the normally closed switch of the high-speed start button 3SB within the area, and then connected in series with the neutral line N of the power supply through the normally closed auxiliary contact of the high-speed operation contactor KM2 set outside the explosion-proof area, the normally closed auxiliary contact of the high-speed operation contactor KM3 set within the explosion-proof area, the normally closed contact of the combustible gas detection linkage intermediate relay COC-KA, the normally closed contact of the low-speed operation thermal relay KH1 and the coil winding of the low-speed operation contactor KM1; the other output end is connected in series with the normally closed switch of the high-speed stop button 2SS outside the area, the normally open switch of the high-speed start button 2SB outside the area, and the normally closed auxiliary contact of the high-speed operation contactor KM2 set outside the explosion-proof area, and the normally closed auxiliary contact of the high-speed operation contactor KM3 set within the explosion-proof area, and the normally closed contact of the combustible gas detection linkage intermediate relay COC-KA, and the normally closed contact of the low-speed operation thermal relay KH1 and the coil winding of the low-speed operation contactor KM1. The normally closed switch of the high-speed stop button 3SS in the area is connected to the neutral line N of the power supply in turn through the normally closed auxiliary contact of the low-speed operation contactor KM1, the normally closed contact of the high-speed operation thermal relay KH2 and the coil winding of the high-speed operation contactor KM2 arranged in the explosion-proof area; the normally open auxiliary contact of the low-speed operation contactor KM1 is connected in parallel to the low-speed manual start button 1SB, the normally open switch of the high-speed start button 3SB in the area and the normally open auxiliary contact of the high-speed operation contactor KM2 arranged in the explosion-proof area are connected in parallel to the normally open switch of the high-speed start button 2SB outside the area, the normally open auxiliary contact input end of the low-speed operation contactor KM1 is electrically connected to the first emergency stop button SB-1JS, and the low-speed The normally open auxiliary contact output end of the running contactor KM1 is connected to the neutral line N of the power supply, the normally open contact input end of the combustible gas detection interlocking intermediate relay COC-KA is electrically connected to the first emergency stop button SB-1JS, and the output end is electrically connected to the normally closed auxiliary contact output end of the low-speed running contactor KM1, the input end of the normally closed auxiliary contact of the low-speed running contactor KM1 is electrically connected to the output end of the normally open contact of the combustible gas detection interlocking intermediate relay COC-KA, and the output end of the normally closed auxiliary contact of the low-speed running contactor KM1 is connected to the neutral line N of the power supply via the normally open auxiliary contact of the high-speed running contactor KM2 arranged in the explosion-proof area and the coil winding of the high-speed running contactor KM3 arranged in the explosion-proof area.

7. The ventilation system for explosion-hazardous cool storage according to claim 6 is characterized in that: The first linkage control unit also includes a first low-speed operation indicator light 1RD1 and a second low-speed operation indicator light 1RD2, a first high-speed operation indicator light 2RD1, a second high-speed operation indicator light 2RD2 and a third high-speed operation indicator light 2RD3. The first low-speed operation indicator light 1RD1 and the second low-speed operation indicator light 1RD2 are both arranged in the explosion-proof area, the first high-speed operation indicator light 2RD1 is arranged outside the explosion-proof area, and the second high-speed operation indicator light 2RD2 is arranged in the explosion-proof area.

8. The ventilation system for explosion-hazardous cool storage according to claim 5 is characterized in that: The second linkage control unit includes a second emergency stop button SB-2JS, a standby fan start button SB-1SB, a standby fan stop button SB-1SS, a standby fan contactor KM4 and a standby fan thermal relay KH3; The input end of the second emergency stop button SB-2JS is electrically connected to the output end of the third overcurrent protection unit FU3, and the output end of the second emergency stop button SB-2JS is connected in series with the normally closed auxiliary contact of the low-speed operation contactor KM1 and the normally closed auxiliary contact of the high-speed operation contactor KM2 set in the explosion-proof area. The output end of the high-speed operation contactor KM2 set in the explosion-proof area is electrically connected to the neutral line N of the power supply after passing through the combustible gas detection linkage intermediate relay COC-KA contact and the coil winding of the standby fan contactor KM4, and the other way is connected to the neutral line N of the power supply through the combustible gas detection linkage intermediate relay COC-KA contact and the coil winding of the standby fan contactor KM4. The normally closed switch of the standby fan stop button SB-1SS, the normally open switch of the standby fan start button SB-1SB, and the coil winding of the standby fan contactor KM4 are electrically connected to the neutral line N of the power supply, the normally open auxiliary contact of the standby fan contactor KM4 is connected in parallel to the standby fan start button SB-1SB, the normally open contact input end of the standby fan thermal relay KH3 is electrically connected to the output end of the high-speed running contactor KM2 arranged in the explosion-proof area, and the output end of the normally open contact of the standby fan thermal relay KH3 is connected to the neutral line N of the power supply.

9. The ventilation system for explosion-hazardous cool storage according to claim 8, characterized in that: The second linkage control unit also includes an overload alarm intermediate relay KA1, an alarm release button JC-SB, an overload alarm release intermediate relay KA2, a standby operation indicator light 1RD, an overload alarm indicator light YD and an overload sound alarm HA. The input end of the standby operation indicator light 1RD is electrically connected to the auxiliary contact of the standby fan contactor KM4, the output end of the standby operation indicator light 1RD is connected to the neutral line N of the power supply, the coil winding of the load alarm intermediate relay KA1 is electrically connected between the normally open contact of the standby fan thermal relay KH3 and the neutral line N of the power supply, the normally open contact input end of the overload alarm intermediate relay KA1 is electrically connected to the output end of the high-speed operation contactor KM2 arranged in the explosion-proof area, the first path of the output end of the overload alarm intermediate relay KA1 is connected to the neutral line N of the power supply through the load alarm indicator light YD, the second path is connected to the neutral line N of the power supply after passing through the normally closed contact of the load alarm release intermediate relay KA2 and the overload sound alarm HA, the third path is connected to the neutral line N of the power supply after passing through the normally open switch of the sound alarm release button JC-SB and the coil winding of the overload alarm release intermediate relay KA2, and the normally open contact of the overload alarm release intermediate relay KA2 is connected in parallel to the sound alarm release button JC-SB.

10. The ventilation system for explosion-hazardous cool storage according to claim 1 is characterized in that: The status signals and fault signals of the dual-speed main fan and the standby emergency fan are fed back to the combustible gas alarm controller through the secondary circuit.

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