CN210000325U - Safety protection circuit of air conditioning system of rail transit vehicle - Google Patents
Safety protection circuit of air conditioning system of rail transit vehicle Download PDFInfo
- Publication number
- CN210000325U CN210000325U CN201920735144.XU CN201920735144U CN210000325U CN 210000325 U CN210000325 U CN 210000325U CN 201920735144 U CN201920735144 U CN 201920735144U CN 210000325 U CN210000325 U CN 210000325U
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- electric heater
- temperature
- air conditioning
- conditioning system
- protector
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Abstract
The utility model discloses an track transportation vehicles air conditioning system's safety protection circuit, including the direct current control return circuit, it has wind pressure switch, temperature protector, forced draught blower contactor normally open contact and electric heater contactor coil to establish ties in proper order on the direct current control return circuit, the wind pressure switch reaches at the wind pressure of forced draught blower the wind pressure switch is closed when setting value, and forced draught blower contactor normally open contact is closed when the forced draught blower normally operates, AC power supply main loop is including circuit breaker, electric heater contactor contact, second temperature protector and the electric heater that establish ties in proper order and set up, its probability that can effectively reduce track transportation vehicles air conditioning system inefficacy.
Description
Technical Field
The utility model relates to an kind of protection circuit, it is kind of rail transit vehicle air conditioning system's safety protection circuit specifically.
Background
At present, an air supply wind pressure switch is not arranged in a heating control loop of an air conditioning system of a rail transit vehicle or is not connected in series in a control coil loop of an electric heating contactor, and an air conditioning system controller controls the attraction of a contact coil of an electric heater according to an electric heating -grade temperature protector and a normally open contact of an air feeder contactor.
When the filth in the air supply cavity of the air conditioning system is seriously blocked, the air supply quantity is gradually reduced, and when the air supply quantity is not enough to take away the heat emitted by the electric heater, the temperature of the air supply cavity is increased, so that -specified potential safety hazard exists, and even the risk of fire hazard exists.
Disclosure of Invention
In order to overcome the defect among the prior art, the embodiment of the utility model provides an kinds of rail transit vehicle air conditioning system's safety protection circuit, its probability that can effectively reduce rail transit vehicle air conditioning system inefficacy.
In order to achieve the purpose, the embodiment of the application discloses a safety protection circuit of rail transit vehicle air conditioning systems, which comprises a direct current control loop, wherein a wind pressure switch, a temperature protector, a normally open contact of a blower contactor and an electric heater contactor coil are sequentially connected in series on the direct current control loop, the wind pressure switch is closed when the wind pressure of a blower reaches a wind pressure switch setting value, and the normally open contact of the blower contactor is closed when the blower normally operates;
the alternating current power supply main loop comprises a circuit breaker, an electric heater contactor contact, a second temperature protector and an electric heater which are sequentially connected in series.
Preferably, the dc control circuit is configured to control the ac main circuit.
Preferably, the th temperature protector is a self-resetting protector, the th temperature protector is closed when the temperature of the electric heater is lower than the set value of the th temperature protector, and is opened when the temperature of the electric heater is higher than the set value of the th temperature protector.
Preferably, the circuit breaker is an alternating current circuit breaker with overload and short circuit protection functions.
Preferably, the electric heater contactor contact is closed when the electric heater contactor coil is electrified.
Preferably, the second temperature protector is a non-automatic resetting protector, the second temperature protector is disconnected when the temperature around the electric heater is higher than the temperature set by the second temperature protector, and the second temperature protector cannot be automatically reset after being disconnected.
The utility model has the advantages as follows:
1. the wind pressure switch is closed when the wind pressure of the air feeder reaches a set value, so that the potential safety hazard easily caused by the fact that the air feeding quantity of the air feeder is reduced and the air feeding quantity of the air feeder is not enough to take away heat emitted by the electric heater when the air feeding cavity of the air conditioning system is blocked can be effectively prevented, and -level protection is provided for the air conditioning system of the rail transit vehicle;
2. the th temperature protector is closed when the temperature of the electric heater is lower than the set value of the th temperature protector, and is opened when the temperature of the electric heater is higher than the set value of the th temperature protector, so that the electric heater can be effectively prevented from working under the condition of overheating, the overload operation of the electric heater is prevented, and the secondary protection is provided for the air conditioning system of the rail transit vehicle;
3. the normally open contact of the air feeder contactor is closed when the air feeder normally operates, so that the electric heater is prevented from continuously working to generate potential safety hazards when the air feeder breaks down, and third-level protection is provided for an air conditioning system of a rail transit vehicle;
4. the circuit breaker cuts off the power supply of the electric heater when the main loop is short-circuited or overloaded, and provides fourth-level protection for the rail transit vehicle air conditioning system;
5. and the second temperature protector is disconnected when the ambient temperature of the electric heater is higher than the set temperature of the second temperature protector, so that fifth-level protection is provided for the air conditioning system of the rail transit vehicle.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a safety protection circuit of an air conditioning system of a rail transit vehicle according to an embodiment of the present invention;
reference numerals of the above figures:
1. a direct current control loop, 11, a wind pressure switch, 12, th temperature protectors, 13, a normally open contact of a blower contactor, 14, an electric heater contactor coil;
2. an AC power supply main loop; 21. a circuit breaker; 22. an electric heater contactor contact; 23. a second temperature protector; 24. an electric heater.
Detailed Description
The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of , but not all embodiments.
In the description of the present invention, it should be noted that the terms "on" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus should not be construed as limiting the present invention, furthermore, the terms "", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, thus, the features defined as "", "second", and the like may explicitly or implicitly include or more of the features.
In order to achieve the purpose, the utility model provides a safety protection circuit of rail transit vehicle air conditioning system, including direct current control loop 1, it has wind pressure switch 11, temperature protector 12, forced draught blower contactor normally open contact 13 and electric heater contactor coil 14 to establish ties in proper order on direct current control loop 1, wind pressure switch 11 is closed when the wind pressure of forced draught blower reaches the wind pressure switch 11 setting value, forced draught blower contactor normally open contact 13 is closed when the forced draught blower normally operates;
the alternating current power supply main loop 2 comprises a circuit breaker 21, an electric heater contactor contact 22, a second temperature protector 23 and an electric heater 24 which are sequentially connected in series.
In this embodiment, please refer to fig. 1, the dc control circuit 1 is used for controlling the electric heater contactor contact 22, the upper end of the dc control circuit 1 is a positive pole, and the dc control circuit is sequentially connected in series with a wind pressure switch 11, an th temperature protector 12, a blower contactor normally open contact 13 and an electric heater contactor coil 14.
In the present embodiment, referring to fig. 1, the ac main power supply circuit 2 includes a three-phase ac main power supply, and a circuit breaker 21, an electric heater contactor contact 22, a second temperature protector 23, and an electric heater 24 which are sequentially and serially connected to the three-phase ac main power supply.
, the DC control loop 1 is used to control the AC main loop 2.
, the thermal protector 12 is closed when the temperature of the electric heater is below the set point of the thermal protector 12 and is opened when the temperature of the electric heater is above the set point of the thermal protector 12.
, the breaker 21 is an ac breaker with overload and short circuit protection.
Further , the electric heater contactor contact 22 engages when the electric heater contactor coil 14 is energized.
, the second temperature protector 23 opens when the temperature around the electric heater is higher than the temperature set by the second temperature protector 23.
By means of the structure, please refer to fig. 1 in this embodiment, the blower and the circuit breaker 21 are started, when the blower operates normally, the normally open contact 13 of the blower contactor is closed, when the wind pressure in the blowing cavity reaches the value set by the wind pressure switch 11, the wind pressure switch 11 is closed, the electric heater 24 starts to operate, when the temperature of the electric heater 24 is lower than the set value of the temperature protector 12, the temperature protector 12 is closed, at this time, the electric heater contactor coil 14 is electrified, and steps are carried out, the electric heater contactor contact 22 is attracted under the action of the electric heater contactor coil 14, so as to open the electric heater 24.
When the temperature of the electric heater 24 is higher than the set value of the second temperature protector 23, the second temperature protector 23 is disconnected, so that the electric heater 24 is turned off.
The utility model discloses in adopted wind pressure switch 11, guaranteed that the air supply volume just opens when can taking away the heat that electric heater 24 gived off electric heater 24 prevents that air supply chamber temperature from rising, increases the potential safety hazard to cause the conflagration.
In this embodiment, referring to fig. 1, when the electric heater 24 is operated, the air supply cavity is seriously clogged, and direct air pressure cannot reach the set value of the air pressure switch 11, the air pressure switch 11 is turned off, and step causes the electric heater contactor contact 22 to be turned off, so that the electric heater 24 stops working, thereby effectively preventing the temperature of the air supply cavity from rising, and increasing the potential safety hazard to cause a fire.
In this embodiment, the th temperature protector 12 and the second temperature protector 23 are both provided with temperature values that the electric heater 24 cannot exceed, which can effectively prevent the electric heater 24 from overheating, thereby causing the electric heater 24 to be damaged, and can prompt the electric heater 24 to be repaired in time, thereby effectively reducing the failure probability of the air conditioning system.
The utility model discloses in used concrete embodiment to explain the principle and the implementation of the utility model, the description of above embodiment is only used for helping understanding the utility model's method and core thought, simultaneously, to technical staff as ordinary in the field, according to the utility model discloses an idea all has the change part on concrete embodiment and application scope, to sum up, this description content should not be understood as the restriction of the utility model.
Claims (6)
- The safety protection circuit of rail transit vehicle air conditioning systems is characterized by comprising the following components:the direct current control loop is sequentially connected with a wind pressure switch, an th temperature protector, a normally open contact of a blower contactor and an electric heater contactor coil in series, wherein the wind pressure switch is closed when the wind pressure of a blower reaches a setting value of the wind pressure switch, and the normally open contact of the blower contactor is closed when the blower normally operates;the alternating current power supply main loop comprises a circuit breaker, an electric heater contactor contact, a second temperature protector and an electric heater which are sequentially connected in series.
- 2. The safety protection circuit of a rail transit vehicle air conditioning system of claim 1, wherein the direct current control loop is used to control the alternating current main power supply loop.
- 3. The safety circuit of air conditioning system for rail transit vehicles of claim 1, wherein the th temperature protector is a self-resetting protector, the th temperature protector being closed when the temperature of the electric heater is lower than the set point of the th temperature protector and being open when the temperature of the electric heater is higher than the set point of the th temperature protector.
- 4. The safety protection circuit for air conditioning system of rail transit vehicle as claimed in claim 1, wherein the circuit breaker is an ac circuit breaker having overload and short circuit protection functions.
- 5. The track transit vehicle air conditioning system safety protection circuit of claim 1, wherein the electric heater contactor contact engages when the electric heater contactor coil is energized.
- 6. The safety protection circuit for air conditioning system of rail transit vehicle as claimed in claim 1, wherein said second temperature protector is a non-automatic reset type protector, said second temperature protector is disconnected when the temperature around said electric heater is higher than the temperature set by said second temperature protector, and said second temperature protector is not automatically reset after being disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920735144.XU CN210000325U (en) | 2019-05-21 | 2019-05-21 | Safety protection circuit of air conditioning system of rail transit vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920735144.XU CN210000325U (en) | 2019-05-21 | 2019-05-21 | Safety protection circuit of air conditioning system of rail transit vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210000325U true CN210000325U (en) | 2020-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920735144.XU Active CN210000325U (en) | 2019-05-21 | 2019-05-21 | Safety protection circuit of air conditioning system of rail transit vehicle |
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| Country | Link |
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| CN (1) | CN210000325U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112249058A (en) * | 2020-10-30 | 2021-01-22 | 石家庄国祥运输设备有限公司 | Electric heating temperature protection device and protection method for air conditioner of railway vehicle |
| WO2022160555A1 (en) * | 2021-01-29 | 2022-08-04 | 中车大连机车研究所有限公司 | Pressure protection control system for co2 air conditioning system of rail transit vehicle |
-
2019
- 2019-05-21 CN CN201920735144.XU patent/CN210000325U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112249058A (en) * | 2020-10-30 | 2021-01-22 | 石家庄国祥运输设备有限公司 | Electric heating temperature protection device and protection method for air conditioner of railway vehicle |
| WO2022160555A1 (en) * | 2021-01-29 | 2022-08-04 | 中车大连机车研究所有限公司 | Pressure protection control system for co2 air conditioning system of rail transit vehicle |
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