CN110542172B - Two-stage low-voltage protection device of ultra-high temperature air conditioner - Google Patents
Two-stage low-voltage protection device of ultra-high temperature air conditioner Download PDFInfo
- Publication number
- CN110542172B CN110542172B CN201910902519.1A CN201910902519A CN110542172B CN 110542172 B CN110542172 B CN 110542172B CN 201910902519 A CN201910902519 A CN 201910902519A CN 110542172 B CN110542172 B CN 110542172B
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- Prior art keywords
- pressure
- low
- air conditioner
- protector
- pressure controller
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- 230000001012 protector Effects 0.000 claims abstract description 73
- 235000014676 Phragmites communis Nutrition 0.000 claims description 15
- 239000003507 refrigerant Substances 0.000 abstract description 18
- 238000005057 refrigeration Methods 0.000 description 10
- 230000003068 static effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a secondary low-pressure protection device of an ultra-high temperature air conditioner, which comprises a pressure controller and a low-pressure protector, wherein the low-pressure protector and the pressure controller are respectively welded on a pipeline of an air conditioner refrigerating system, which is close to a steam return port of a compressor, the low-pressure protector and the pressure controller respectively sense the pipeline pressure of a return air end of the compressor, the low-pressure protector and the pressure controller are integrally connected in series to form a series branch, and two ends of the series branch are respectively connected in an air conditioner start-stop control circuit. The invention can truly protect the air conditioner, the air conditioner compressor cannot be burnt out due to lack of refrigerant, and the temperature application range of the air conditioner is widened.
Description
Technical Field
The invention relates to the field of air conditioner protection devices, in particular to a secondary low-voltage protection device of an ultra-high temperature air conditioner.
Background
The working principle of the air conditioner refrigerating system is shown in figure 1, low-temperature low-pressure gaseous refrigerant in the air conditioner refrigerating system is sucked and compressed into high-temperature high-pressure gas by a compressor, the high-pressure gas is cooled into high-pressure liquid in an outdoor unit heat exchanger, the high-pressure liquid refrigerant is throttled and depressurized by an expansion valve and flows into an indoor unit heat exchanger, the low-pressure liquid refrigerant is evaporated and absorbs heat, the indoor temperature is reduced, the evaporated refrigerant gas is sucked by the compressor again, and the repeated circulation is performed, so that the aim of reducing the room temperature is achieved.
The core component of the air conditioner refrigerating system is a compressor, the compressor can suck low-pressure vaporous refrigerant of the air conditioner refrigerating system and discharge high-temperature high-pressure gas refrigerant, when the air conditioner refrigerating system leaks, the refrigerating effect of the air conditioner can be affected, the air conditioner compressor can idle for a long time to burn out the compressor, in order to avoid the situation, a low-pressure protector is usually arranged on a pipeline of the air conditioner refrigerating system, which is close to a steam return port of the compressor, when the internal pressure of the air conditioner refrigerating system due to the leakage of the refrigerant is lower than a set value of the low-pressure protector, the low-pressure protector is disconnected, and because a control line of the low-pressure protector is connected into a starting control circuit of the air conditioner in series, the air conditioner stops working, and the compressor stops running to avoid the burning phenomenon.
At present, an ultra-high temperature air conditioner works in an external environment with the temperature of 40-80 ℃ for a long time, a low pressure switch of an air conditioner refrigerating system is not turned off, the air conditioner can work normally, but sometimes the air conditioner can also perform refrigeration work in an outdoor environment with the temperature of below 40 ℃, the refrigerating system pressure of the air conditioner often becomes very low due to the fact that the condensing capacity of an outdoor unit is very good at the low ambient temperature, particularly the air conditioner filled with low pressure refrigeration (such as R142b refrigerant), the low pressure (R142 b refrigerant) is filled into the ultra-high temperature air conditioner, the switch of the low pressure protector is turned off due to the fact that the internal pressure of the air conditioner refrigerating system is lower than the set value of the low pressure protector at the lower outdoor ambient temperature, the air conditioner stops working, the actual air conditioner refrigerating system does not leak, the air conditioner does not lack the refrigerant, the air conditioner should continue refrigeration work in the environment, and the turn-off of the low pressure protector belongs to misoperation. Although the low-pressure protector is disconnected to avoid the burning phenomenon of the compressor, the low-pressure protector belongs to misjudgment of the low-pressure fault of the air conditioner refrigerating system, and the actual air conditioner does not lack the refrigerant, so that the normal operation of the air conditioner is influenced.
Disclosure of Invention
The invention aims to provide a secondary low-pressure protection device for an ultrahigh-temperature air conditioner, which aims to solve the problem that the low-pressure fault of the air conditioner is misreported under the condition of low ambient temperature of the air conditioner in the prior art and the air conditioner cannot work normally, and widens the low ambient temperature use temperature range of the ultrahigh-temperature air conditioner.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides an ultra-high temperature air conditioner second grade low pressure protection device which characterized in that: the low-pressure protector and the pressure controller sense the pressures at different positions of a compressor return air end pipeline through respective pressure sensing ends respectively, the low-pressure protector and the pressure controller are integrally connected in series to form a serial branch, two ends of the serial branch are respectively connected with an air conditioner start-stop control circuit, and the pressure controller controls the low-pressure protector to be connected with or not connected with the air conditioner start-stop control circuit.
The secondary low-pressure protection device of the ultra-high temperature air conditioner is characterized in that: the low-voltage pressure protector is provided with two cables, the pressure controller is provided with three fixed contacts and a movable reed, one end of the movable reed is connected with the first fixed contact, the other end of the movable reed is contacted with the second fixed contact and can move to be separated from the second fixed contact to be contacted with the third fixed contact, one cable of the low-voltage pressure protector is connected with the second fixed contact of the pressure controller, the other cable of the low-voltage pressure protector is connected with the third fixed contact of the pressure controller, thus a serial branch circuit is formed, the first fixed contact of the pressure controller is connected with an air conditioner start-stop control circuit, and a lead is led out between the other cable of the low-voltage pressure protector and the third fixed contact of the pressure controller to be connected with the air conditioner start-stop control circuit, so that the serial branch circuit is connected with the air conditioner start-stop control circuit.
The secondary low-pressure protection device of the ultra-high temperature air conditioner is characterized in that: the pressure sensing ends of the low-pressure protector and the pressure controller are respectively in bypass communication with a return air end pipeline of the compressor.
The secondary low-pressure protection device of the ultra-high temperature air conditioner is characterized in that: the pressure sensing end of the pressure controller is positioned between the pressure sensing end of the low-pressure protector and the air return end of the compressor.
The pressure is sensed by the low-pressure protector, the pressure acts on the spring piece and exceeds a set elastic pressure value, the spring piece is sprung to be contacted with the two electric connection contacts respectively, so that the two cables at the head of the low-pressure protector are connected to form a circuit path, and when no pressure acts on the spring piece or the pressure does not exceed the set elastic pressure value, the two cables at the head of the low-pressure protector are disconnected to form a circuit breaker.
The pressure controller is internally provided with a movable contact spring for sensing pressure, and is provided with three fixed contacts, one end of the movable contact spring is connected with a first fixed contact, the other end of the movable contact spring is kept in electrical contact with a second fixed contact, when the pressure controller does not sense pressure or the pressure does not exceed the set elastic pressure value of the movable contact spring, the movable contact spring is connected with the first fixed contact spring and the second fixed contact spring to form a passage, and when pressure acts on the movable contact spring, one end of the movable contact spring can be in electrical contact with a third fixed contact spring to form a passage.
In the invention, when the pressure of the system in the air conditioner is lower due to the lack of the refrigerant, and the pressure of the air conditioner system is lower than the set values of the pressure controller and the low-pressure protector, the spring piece in the low-pressure protector is kept to reset, and at the moment, the two cables of the low-pressure protector are disconnected. The movable reed in the pressure controller is also reset, and the protector circuit formed by the movable reed and the pressure controller is wholly disconnected, so that the air conditioner can be controlled to stop together at the moment, and the air conditioner is protected.
When the air conditioner works at a lower outdoor environment temperature, the pressure value of the air conditioner system is lower than the set value of the pressure controller, the movable reed of the pressure controller can be kept reset, at the moment, the pressure of the air conditioner system where the low-pressure protector is located is higher than that of the air conditioner system where the pressure controller is located, the spring piece of the low-pressure protector is in an elastic state, so that two cables of the low-pressure protector are in a connection state, the air conditioner cannot stop working due to the fact that the pressure of the system where the low-pressure protector is located is low, and the low-pressure protector independently protects an air conditioner refrigerating system. When the air conditioner truly leaks refrigerant, the low pressure (the pressure of the position where the low pressure protector is located) of the refrigerating system is lower than the set pressure value of the low pressure protector, the two cables of the low pressure protector are disconnected, and the air conditioner stops working, so that the air conditioner can be truly protected, the air conditioner cannot be burnt due to the lack of the refrigerant, and the use of the air conditioner at a low environment temperature cannot be influenced.
The invention has the beneficial effects that:
1) The risk of using and stopping the super air conditioner in a low-temperature external environment is avoided, and the temperature range of using the air conditioner in a low-environment temperature is widened.
2) The risk of long-term idle running of the air conditioner compressor is avoided, and the service life of the air conditioner compressor is prolonged.
Drawings
Fig. 1 is a schematic diagram of the operation of a prior art air conditioner refrigeration system.
Fig. 2 is a schematic diagram of the structure of the low pressure protector.
Fig. 3 is a schematic structural diagram of the pressure controller.
Fig. 4 is a schematic view of the structural principle of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 2-4, the two-stage low-pressure protection device of the ultra-high temperature air conditioner comprises a low-pressure protector 1 and a pressure controller 2, wherein the low-pressure protector 1 and the pressure controller 2 sense the pressures at different positions of a return air end pipeline 4 of a compressor 3 through respective pressure sensing ends respectively, the low-pressure protector 1 and the pressure controller 2 are integrally connected in series to form a series branch, two ends of the series branch are respectively connected with an air conditioner start-stop control circuit, and the pressure controller 2 controls the low-pressure protector 1 to be connected into or not connected into the air conditioner start-stop control circuit.
As shown in fig. 2, a spring piece 5 for sensing pressure is arranged in the low pressure protector 1, two cable lines A, B are arranged at the head, one end of each of the two cable lines A, B extends into the low pressure protector 1 and is respectively connected with an electric connection contact, when the low pressure protector 1 senses the pressure, the pressure acts on the spring piece 5 and exceeds a set elastic pressure value, the spring piece 5 is sprung to be respectively contacted with the two electric connection contacts, so that the two cable lines A, B at the head of the low pressure protector 1 are connected to form a circuit path, and when no pressure acts on the spring piece 5 or the pressure does not exceed the set elastic pressure value, the two cable lines A, B at the head of the low pressure protector 1 are disconnected to form a circuit breaking.
As shown in fig. 3, the pressure controller 2 has a movable contact spring 6 for sensing pressure inside, and has three fixed contacts a, b, c, wherein one end of the movable contact spring 6 is connected with the first fixed contact a, the other end of the movable contact spring 6 is kept in electrical contact with the second fixed contact b, when the pressure controller 2 does not sense pressure or the pressure does not exceed the set elastic pressure value of the movable contact spring 6, the movable contact spring 6 is connected with the first fixed contact a and the second fixed contact b to form a passage, and when pressure acts on the movable contact spring 6, one end of the movable contact spring 6 can be electrically contacted with the third fixed contact c to form a passage.
In the invention, one cable A of a low-pressure protector 1 is connected with a second static contact B of a pressure controller 2, the other cable B of the low-pressure protector 1 is connected with a third static contact c of the pressure controller 2, thus forming a serial branch, the first static contact a of the pressure controller 2 is connected with an air conditioner start-stop control circuit through a line E, and a line F is led out between the other cable B of the low-pressure protector 1 and the third static contact c of the pressure controller 2 and is connected with the air conditioner start-stop control circuit, thus realizing the connection of the serial branch and the air conditioner start-stop control circuit.
The pressure sensing ends of the low-pressure protector 1 and the pressure controller 2 are respectively in bypass communication with a pipeline at the air return end 4 of the compressor 3. And the pressure sensing end of the pressure controller 2 is positioned between the pressure sensing end of the low-pressure protector 1 and the air return end of the compressor 3.
According to the invention, the pressure controller 2 is welded on a return steam pipeline of an air conditioner compressor close to a return steam port, the pressure controller 2 can set a pressure value (0.02 MPa), the low-pressure protector 1 is welded on the return steam pipeline (at the outlet of an evaporator) of the air conditioner refrigerating system, which is far away from the return steam port of the compressor, at a proper distance, and the set pressure value of the low-pressure protector 1 is a fixed value (0.02 MPa).
When the system pressure is higher than the fixed set pressure value of the low pressure protector 1, the cables a and B of the low pressure protector 1 are turned on, and the cables a and B are turned off. The pressure controller 2 is connected by a cable according to fig. 4, a control line is connected in series to a starting control circuit of the air conditioner, when the air conditioner refrigerating system is not lack of refrigerant, and the internal pressure of the air conditioner refrigerating system is larger than the set pressure value (such as 0.02 MPa) of the pressure controller 2, the movable reed 6 of the pressure controller 2 springs up, the movable reed 6 of the pressure controller 2 enables the static contacts a and c to be connected, the cable A and the cable B are short-circuited, the cable A and the cable B are directly connected between the cable E and the cable F connected with the air conditioner starting and stopping control circuit, and the air conditioner can normally refrigerate.
When the temperature of the air conditioning and cooling system is too low due to the fact that the environment temperature is too low, the internal pressure (the sensing position of the pressure controller) of the air conditioning and cooling system is smaller than a set pressure value (such as 0.02 MPa), the movable reed 6 of the pressure controller 2 is disconnected from the fixed contact c, the movable reed 6 of the pressure controller 2 is reset, the fixed contacts a and b are connected through the movable reed 6, and the low-pressure protector 1 is connected in series to a starting control circuit of the air conditioner. When the refrigerant flows in the pipeline of the refrigeration system, due to pressure drop of pipeline resistance, at the moment, the pressure of the refrigeration system at the position of the low-pressure protector 1 is larger than the system pressure at the position of the pressure controller 2 which is close to the vapor return port of the compressor because the pressure of the refrigeration system at the position of the low-pressure protector 1 is far away from the position of the compressor, when the internal pressure (the sensing position of the pressure controller 2) of the air conditioner refrigeration system is smaller than the set pressure value (0.02 MPa) of the pressure controller 2, the static contact a and the static contact B of the pressure controller 2 are connected, and at the moment, if the pressure of the refrigeration system at the position of the low-pressure protector 1 is larger than the system pressure at the position of the pressure controller 2 and is higher than the set pressure value (0.02 MPa), the spring leaf 5 of the low-pressure protector 1 is sprung up, the connection between the cable A and the cable B can enable the circuit E, F of the control circuit to be started and stopped, and the air conditioner can continue normal refrigeration operation under the condition that the pressure of the vapor return port of the compressor is lower, and the air conditioner cannot work normally under the condition that the pressure value of the vapor return port of the air conditioner is lower than the set pressure value (0.02 MPa), and the air conditioner cannot work in the ultra-low temperature environment.
In addition, when the air conditioner refrigerating system lacks refrigerant due to leakage, the pressure in the pipeline of the air conditioner refrigerating system (the position where the low-pressure protector 1 is positioned) is smaller than the set pressure value (0.02 MPa) of the low-pressure protector 1, and is also smaller than the set pressure value (0.02 MPa) of the pressure controller 2, the movable reed 6 of the pressure controller 2 and the spring piece 5 of the low-pressure protector 1 are reset, the circuit E, F of the air conditioner start-stop control circuit is disconnected, the circuit E, F of the air conditioner start-stop control circuit is disconnected, and the air conditioner compressor is stopped.
The application of the secondary low-voltage protection device in the ultra-high temperature air conditioner is only listed in fig. 4, and the invention can be applied to most household air conditioners and military and civil special air conditioners. The above embodiments are not limited to the scope of the present invention, and all modifications or variations based on the basic idea of the present invention are within the scope of the present invention.
Claims (2)
1. The utility model provides an ultra-high temperature air conditioner second grade low pressure protection device which characterized in that: the low-pressure protector and the pressure controller sense the pressures of different positions of a compressor return air end pipeline through respective pressure sensing ends respectively, the low-pressure protector and the pressure controller are integrally connected in series to form a serial branch, two ends of the serial branch are respectively connected with an air conditioner start-stop control circuit, and the pressure controller controls the low-pressure protector to be connected with or not connected with the air conditioner start-stop control circuit;
the low-voltage pressure protector is provided with two cables, the pressure controller is provided with three fixed contacts and a movable reed, one end of the movable reed is connected with the first fixed contact, the other end of the movable reed is contacted with the second fixed contact and can move to be separated from the second fixed contact to be contacted with the third fixed contact, one cable of the low-voltage pressure protector is connected with the second fixed contact of the pressure controller, the other cable of the low-voltage pressure protector is connected with the third fixed contact of the pressure controller, thus a serial branch circuit is formed, the first fixed contact of the pressure controller is connected with an air conditioner start-stop control circuit, and a lead is led out between the other cable of the low-voltage pressure protector and the third fixed contact of the pressure controller to be connected with the air conditioner start-stop control circuit, so that the serial branch circuit is connected with the air conditioner start-stop control circuit; the pressure sensing ends of the low-pressure protector and the pressure controller are respectively in bypass communication with a return air end pipeline of the compressor.
2. The ultra-high temperature air conditioner secondary low pressure protection device according to claim 1, wherein: the pressure sensing end of the pressure controller is positioned between the pressure sensing end of the low-pressure protector and the air return end of the compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910902519.1A CN110542172B (en) | 2019-09-24 | 2019-09-24 | Two-stage low-voltage protection device of ultra-high temperature air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910902519.1A CN110542172B (en) | 2019-09-24 | 2019-09-24 | Two-stage low-voltage protection device of ultra-high temperature air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN110542172A CN110542172A (en) | 2019-12-06 |
| CN110542172B true CN110542172B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910902519.1A Active CN110542172B (en) | 2019-09-24 | 2019-09-24 | Two-stage low-voltage protection device of ultra-high temperature air conditioner |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5315653A (en) * | 1976-07-28 | 1978-02-13 | Mitsubishi Electric Corp | Control circuit of air conditioner |
| CN102679506A (en) * | 2011-03-11 | 2012-09-19 | 上海日立电器有限公司 | Leakage processing device for flammable refrigerant in air-conditioning system |
| CN205448180U (en) * | 2015-11-24 | 2016-08-10 | 上海海立特种制冷设备有限公司 | Bridge crane air conditioner prevents that compressor starts protection device of low pressure |
| CN205980497U (en) * | 2016-08-24 | 2017-02-22 | 武汉克莱美特环境设备有限公司 | Compressor's shutdown protection system |
| CN107053997A (en) * | 2016-12-22 | 2017-08-18 | 重庆长安汽车股份有限公司 | Automobile air-conditioning evaporator defroster and method |
| CN108344122A (en) * | 2018-04-12 | 2018-07-31 | 合肥天鹅制冷科技有限公司 | High-temperature air conditioner cryogenic refrigeration operating system |
| CN210892055U (en) * | 2019-09-24 | 2020-06-30 | 合肥天鹅制冷科技有限公司 | Secondary low-voltage protection device of ultra-high temperature air conditioner |
-
2019
- 2019-09-24 CN CN201910902519.1A patent/CN110542172B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5315653A (en) * | 1976-07-28 | 1978-02-13 | Mitsubishi Electric Corp | Control circuit of air conditioner |
| CN102679506A (en) * | 2011-03-11 | 2012-09-19 | 上海日立电器有限公司 | Leakage processing device for flammable refrigerant in air-conditioning system |
| CN205448180U (en) * | 2015-11-24 | 2016-08-10 | 上海海立特种制冷设备有限公司 | Bridge crane air conditioner prevents that compressor starts protection device of low pressure |
| CN205980497U (en) * | 2016-08-24 | 2017-02-22 | 武汉克莱美特环境设备有限公司 | Compressor's shutdown protection system |
| CN107053997A (en) * | 2016-12-22 | 2017-08-18 | 重庆长安汽车股份有限公司 | Automobile air-conditioning evaporator defroster and method |
| CN108344122A (en) * | 2018-04-12 | 2018-07-31 | 合肥天鹅制冷科技有限公司 | High-temperature air conditioner cryogenic refrigeration operating system |
| CN210892055U (en) * | 2019-09-24 | 2020-06-30 | 合肥天鹅制冷科技有限公司 | Secondary low-voltage protection device of ultra-high temperature air conditioner |
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| CN110542172A (en) | 2019-12-06 |
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