CN219367921U

CN219367921U - Safety device of heating and ventilation system

Info

Publication number: CN219367921U
Application number: CN202223187801.2U
Authority: CN
Inventors: 段玉立
Original assignee: Shijiazhuang Xianchu Nuclear Equipment Co Ltd
Current assignee: Shijiazhuang Xianchu Nuclear Equipment Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-07-18
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a safety device of a heating and ventilation system, which comprises a pneumatic device, wherein the output end of the pneumatic device is fixedly connected with the input end of a filtering and pressure reducing valve; the filtering pressure reducing valve is sequentially connected with an electromagnetic valve and a chain safety valve through a gas circuit pipeline; the interlocking safety valve is fixedly connected with the fan through a connecting flange; the fan is fixedly connected with the motor through a transmission mechanism; the motor is connected in parallel to the main circuit of the control box through wires, and the electromagnetic valve is connected in parallel to the interlocking control circuit of the control box. The utility model solves the problems that the check valve in the existing heating and ventilation system cannot be fully opened or closed in a low-flow state, and the valve needs to rely on reverse air pressure.

Description

Safety device of heating and ventilation system

Technical Field

The utility model belongs to the technical field of fluid control, and relates to a safety device of a heating and ventilation system.

Background

In the existing heating and ventilation system, check valves are adopted as safety valves at the outlets of a fan and an air conditioner, so that backflow of system fluid is prevented, and main equipment is protected. The problem is that 1, when the check valve is closed, the check valve is closed by gravity, and meanwhile, because a plurality of main equipment are connected in parallel (one is provided with one by one, one is provided with multiple purposes or one is provided with multiple purposes) in the heating and ventilation system and are installed in the same factory building, medium is output through one pipeline, so that when the whole system is safe and reliable, reverse air pressure can be generated at the closing position of the fan, the check valve is closed and accelerated, and the collision noise is large; 2. the check valve opening angle is small when the main equipment is in a low flow state after being started, the flow resistance is large, the starting energy of the fan needs to be adjusted and increased, the operation of the fan is accelerated, and the air quantity in the pipeline is increased to ensure the air quantity required by each equipment in the subsequent pipeline.

Disclosure of Invention

In order to achieve the above purpose, the utility model provides a safety device of a heating and ventilation system, which solves the problems that a check valve in a low flow state cannot be fully opened or closed in the existing heating and ventilation system, reverse air pressure is needed to be relied on, and the like.

In order to solve the technical problems, the utility model adopts the technical scheme that the safety device of the heating and ventilation system comprises a pneumatic device, wherein the output end of the pneumatic device is fixedly connected with the input end of a filtering and pressure reducing valve; the filtering pressure reducing valve is sequentially connected with an electromagnetic valve and a chain safety valve through a gas circuit pipeline; the interlocking safety valve is fixedly connected with the fan through a connecting flange; the fan is fixedly connected with the motor through a transmission mechanism; the motor is connected in parallel to the main circuit of the control box through wires, and the electromagnetic valve is connected in parallel to the interlocking control circuit of the control box.

Further, a main circuit of the control box is connected with an external power line in parallel, and a breaker QF, an alternating current contactor KM and a thermal relay KH are sequentially arranged between the main circuit and a motor access end from the external power line; one end of the interlocking control circuit is connected with a zero line N of an external power line in parallel, and the other end of the interlocking control circuit is connected with any one line between a breaker QF of the main circuit and an alternating current contactor KM in parallel.

Further, the interlocking control circuit comprises a button switch SB2, one end of the button switch SB2 is connected with a zero line N of an external power line in parallel, and the other end of the button switch SB2 is connected with a normally closed contact KH1 of the thermal overload relay, an alternating current contactor coil KM/O and a normally open contact KM2 of the alternating current contactor in series in sequence and then is connected into an electromagnetic valve; one end of the button switch SB1 connected in parallel with the normally open contact KM1 of the alternating current contactor is connected between the coil KM/O of the alternating current contactor and the normally open contact KM2 of the alternating current contactor, and the other end of the button switch SB1 connected in parallel with the normally open contact KM1 of the alternating current contactor is connected in parallel with the fuse FU into an electromagnetic valve; the fuse FU is connected to any one line between the breaker QF of the main circuit and the ac contactor KM.

Further, the safety valve further comprises a manual operating mechanism which is fixedly connected to the interlocking safety valve.

The beneficial effects of the utility model are as follows:

the utility model adopts the electric interlocking control of the opening and closing of the heating and ventilation main equipment and the opening and closing of the valve at the outlet, so as to realize the full opening of the valve in the low flow state of the main equipment, the flow resistance generated in the pipeline is smaller, and when the main equipment is powered off and closed, the valve automatically closes and cuts off the pipeline, thereby realizing the safety function of preventing the backflow of the system medium.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of an embodiment of the present utility model.

Fig. 2 is a schematic diagram of the gas circuit for controlling the interlock safety valve according to an embodiment of the present utility model.

FIG. 3 is a schematic diagram of a safety device of a heating ventilation system according to an embodiment of the present utility model.

In the figure, a pneumatic device, a filtering and reducing valve, a solenoid valve, a manual operating mechanism, a linkage safety valve, a connecting flange, a fan, a transmission mechanism, a motor and a control box are respectively arranged in sequence, wherein the pneumatic device, the filtering and reducing valve, the solenoid valve, the manual operating mechanism, the linkage safety valve, the connecting flange, the fan, the transmission mechanism, the motor and the control box are respectively arranged in sequence.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides a safety device of a heating and ventilation system, which is shown in fig. 3, and comprises a pneumatic device 1, wherein the output end of the pneumatic device 1 is fixedly connected with the input end of a filtering and pressure reducing valve 2; the filtering pressure reducing valve 2 is sequentially connected with the electromagnetic valve 3 and the interlocking safety valve 5 through gas circuit pipelines; the interlocking safety valve 5 is fixedly connected with the fan 7 through a connecting flange 6; the fan 7 is fixedly connected with the motor 9 through a transmission mechanism 8; the motor 9 is connected in parallel to the main circuit of the control box 10 through wires, and the electromagnetic valve 3 is connected in parallel to the interlocking control circuit of the control box 10; the manual operation mechanism 4 is fixedly connected with the interlocking safety valve 5 and is used for manually closing the interlocking safety valve 5.

Mechanical part name and corresponding function in fig. 3:

part 1 (pneumatic device) -ventilation rotation, automatic return of gas interruption, providing input torque for the interlocked safety valve;

part 2 (filter pressure reducing valve) -filtering impurities in the air source and adjusting the air source pressure at the same time;

a piece 3, an electromagnetic valve, and a switching control gas circuit;

the part 4 and a manual operation mechanism are used for manually closing the interlocking safety valve 5 in the power failure or gas failure state to play a safety function;

the piece 5, the interlocking safety valve-on and off control heating and ventilation system, realize the safety function;

the piece 6, the connecting flange, the connecting safety valve 5 and the heating ventilation main equipment (fan 7) form a heating ventilation source output end;

the piece 7, the fan-impeller rotate to provide output air quantity;

a piece 8 transmission mechanism, which provides the kinetic energy of the motor to the impeller of the fan 7 to drive the impeller of the fan 7 to rotate;

part 9, motor-providing the power source of fan 7;

the part 10, the control box, the power input end, controls the mechanical mechanism of fig. 3 to act according to the electrical principle of fig. 1 and 2;

in some embodiments, the electromagnetic valve 3 is connected in parallel to a control loop of the start-stop self-locking of the motor 9 by the interlocking control according to the circuit shown in fig. 1, and the electric safety is achieved by adopting a strong current power supply and weak current control power supply mode; the motor 9 is controlled by the control box 10 (in practical application, the motor can be controlled by a control circuit, a PLC program and other control modes), the electromagnetic valve 3 is powered on, and the interlocking safety valve 5 is fully opened; when the motor 9 is powered off, the electromagnetic valve 3 is powered off, and the interlocking safety valve 5 is automatically reset and closed, so that interlocking control is realized.

The names and functions of the electrical components in fig. 1:

QF (circuit breaker) -controlling the on-off of the main circuit;

KM (alternating current contactor) -switching on and sectioning the load;

KH (thermal relay) -performing an overheat protection function for the main motor;

SB1, SB2 (push button switch) -executing the on-off function of the control circuit;

KH1 (thermal overload relay normally closed contact) -the control circuit performs the overheat breaking function when the main motor is overheated;

KM/O (alternating current contactor coil) -the on-off of the electrified control contact performs a circuit replacement function;

KM1, KM2 (normally open contacts of ac contactor) -KM contacts;

FU (fuse) -a circuit safety device;

MX (motor 9) -control the ventilation of the main equipment;

YV (solenoid valve 3) -controlling the switching of the gas path of the interlocking safety valve at the outlet of the main equipment;

the names and functions of the electrical components in fig. 2:

f (filter pressure reducing valve 2) -filtering the gas impurities entering the pneumatic control circuit, adjusting the pressure entering the pneumatic circuit;

thick line-gas path pipeline.

The implementation mode of the safety function in the utility model is as follows: after the control box 10 cuts off the power supply, the motor 9 is powered off and the electromagnetic valve 3 is powered off, the motor 9 stops the fan 7 through the transmission mechanism 8, and meanwhile, the electromagnetic valve 3 is powered off and the air source is cut off, the pneumatic device 1 automatically resets and closes the interlocking safety valve 5, and the air flow is prevented from flowing backwards and the impeller of the fan 7 is prevented from reversing and damaging the motor 9.

Meanwhile, the process of controlling the valve to be closed by the interlocking safety valve 5 is controllable, referring to fig. 2, the output torque of the pneumatic device 1 can be adjusted by adjusting the air source pressure through the filtering pressure reducing valve 2, and the closing speed of the valve is not controllable in the prior device, which is to forcedly close the valve through the backflow medium, and only the pressure difference at two sides is generated after the medium is blocked, so that the utility model has low noise.

The specific implementation process of the utility model is as follows:

action one: the control box 10 is powered on, the motor 9 is started, the electromagnetic valve 3 is powered on to change the ventilation source, the motor 9 drives the fan 7 to operate through the transmission mechanism 8, the pneumatic device 1 is controlled to act to drive the interlocking safety valve 5 to open by the pressure of the ventilation source after the electromagnetic valve 3 is powered on, the valves which are all opened output the maximum air quantity, the pipeline at the outlet of the fan is smooth, and the effect of low flow resistance is achieved.

Action two: the control box 10 is powered off, the motor 9 stops rotating, the electromagnetic valve 3 is powered off and commutates, the motor 9 stops running through the transmission mechanism 8, the medium flow required by the pipeline stops being supplied, meanwhile, the electromagnetic valve 3 is powered off, the electromagnetic valve 3 commutates, the air source through the electromagnetic valve 3 is cut off, the single-acting pneumatic device of the piece 1 is used for exhausting and rotating, the output torque of the device drives the interlocking safety valve 5 to be closed, the pipeline is cut off, the air is prevented from flowing backwards, the motor 9 is burnt, and the safety function is implemented.

In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims

1. The safety device of the heating and ventilation system is characterized by comprising a pneumatic device (1), wherein the output end of the pneumatic device (1) is fixedly connected with the input end of a filtering and pressure reducing valve (2); the filtering pressure reducing valve (2) is sequentially connected with the electromagnetic valve (3) and the interlocking safety valve (5) through a gas circuit pipeline; the interlocking safety valve (5) is fixedly connected with the fan (7) through a connecting flange (6); the fan (7) is fixedly connected with the motor (9) through a transmission mechanism (8); the motor (9) is connected in parallel to the main circuit of the control box (10) through wires, and the electromagnetic valve (3) is connected in parallel to the interlocking control circuit of the control box (10).

2. The safety device of the heating and ventilation system according to claim 1, wherein a main circuit of the control box (10) is connected with an external power line in parallel, and a breaker QF, an alternating current contactor KM and a thermal relay KH are sequentially arranged between the main circuit and an access end of the motor (9) from the external power line; one end of the interlocking control circuit is connected with a zero line N of an external power line in parallel, and the other end of the interlocking control circuit is connected with any one line between a breaker QF of the main circuit and an alternating current contactor KM in parallel.

3. The safety device of the heating and ventilation system according to claim 2, wherein the interlocking control circuit comprises a button switch SB2, one end of the button switch SB2 is connected with a zero line N of an external power line in parallel, and the other end of the button switch SB2 is connected with a solenoid valve (3) after being connected with a normally closed contact KH1 of a thermal overload relay, an alternating current contactor coil KM/O and a normally open contact KM2 of the alternating current contactor in series in sequence; one end of the button switch SB1 connected in parallel with the normally open contact KM1 of the alternating current contactor is connected between the coil KM/O of the alternating current contactor and the normally open contact KM2 of the alternating current contactor, and the other end of the button switch SB1 connected in parallel with the normally open contact KM1 of the alternating current contactor is connected in parallel with the fuse FU into an electromagnetic valve (3); the fuse FU is connected to any one line between the breaker QF of the main circuit and the ac contactor KM.

4. A safety device of a heating and ventilation system according to claim 1, further comprising a manual operating mechanism (4), wherein the manual operating mechanism (4) is fixedly connected to the interlocked safety valve (5).