Flammable refrigerant rapid discharge device

Abstract

The utility model belongs to the technical field of safe use of flammable refrigerants, and discloses a flammable refrigerant quick discharge device which comprises an elastic mechanism, a piston-like assembly, a heater and a connector, and the connector serves as a channel for discharging the flammable refrigerants or not. The piston-like assembly is contained in the connector, and a gap between the piston-like assembly and the inner wall of the connector is completely filled with a solidified fuse link located outside the piston-like assembly. The heater is used for carrying out controllable active heating on the fuse link; the elastic mechanism is connected with the piston-like assembly, and the piston-like assembly can be brought out of the connector through elastic potential energy of the elastic mechanism after the fuse link is heated and fused by the heater, so that the connector is opened. By improving the composition of each component of the device, the connecting mode of each component and the corresponding matching working mode, the technical problem of safety risk caused by refrigerant leakage of the existing combustible refrigerant air-conditioning system can be solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the combustible refrigerant safe use technical field, more specifically, it relates to a kind of combustible refrigerant quick discharge device, it can be used in the indoor unit and outdoor unit of air conditioning system. BACKGROUND

[0002] With the importance of ozone layer destruction and greenhouse effect intensification, countries around the world gradually eliminated ODP greater than zero containing chlorine refrigerant, and began to limit the use of high global warming potential (GWP) of hydrofluorocarbon (HFC) refrigerant. At present, in the field of household air conditioner, the most concerned alternative refrigerant is hydrocarbon refrigerant. However, hydrocarbon refrigerant is flammable. Various electrical components on air conditioner, as large as motor, compressor, as small as resistance, capacitor, relay on electric control board, etc., will produce discharge, arc and heat phenomenon during use. When refrigerant leaks, once the concentration of flammable refrigerant is within its combustion range, electrical components may become ignition source to ignite refrigerant, causing safety accidents.

[0003] In order to avoid safety accidents caused by refrigerant leakage, relevant personnel proposes to solve the problem by using several methods.

[0004] The first method is to reduce the leakage of refrigerant by reducing the charge of refrigerant. However, the reduction of refrigerant charge is limited by the content of compressor, evaporator, condenser, connecting pipeline and some auxiliary components, and the refrigerant charge of refrigeration system will also directly affect the performance of refrigeration system. The second method is to detect the concentration of indoor flammable refrigerant by using related technology, and when leakage is detected, the refrigerant is blown from the drain to the outdoor by indoor fan. The third method is to detect the concentration of indoor flammable refrigerant by using related technology, and when leakage is detected, the refrigerant is pumped from indoor heat exchanger to outdoor heat exchanger or storage tank by compressor suction. However, the above method has the problems of long exhaust time, low efficiency, cannot quickly solve the safety hazard, and high modification cost. The fourth method is to control by electromagnetic valve, safety valve and other valves. When flammable refrigerant leaks, it is discharged to the outside through the communication channel with the outside. However, due to the large pressure difference between refrigerant in air conditioner and atmosphere, electromagnetic valve cannot realize complete sealing and no leakage under normal working condition of air conditioner. Safety valve is a passive discharge device, which realizes discharge of refrigerant under dangerous condition by using temperature difference or pressure difference as driving force, and cannot realize active control of discharge. UTILITY MODEL CONTENT

[0005] In view of the above defects or improvement needs of the prior art, the purpose of the present application is to provide a combustible refrigerant rapid discharge device, which can solve the technical problem of safety risk caused by refrigerant leakage in the existing combustible refrigerant air conditioning system by improving the composition of each component of the device, the connection mode of each component and the corresponding cooperation working mode.

[0006] To achieve the above-mentioned purpose, the present application provides a combustible refrigerant rapid discharge device, which comprises an elastic mechanism, a piston-like assembly, a heater and a joint, wherein the joint is a channel for discharging or not discharging the combustible refrigerant; the piston-like assembly is contained in the interior of the joint, and the gap between the piston-like assembly and the inner wall of the joint is completely filled with a solid-state fuse body located outside the piston-like assembly, so that the piston-like assembly can seal and block the joint under the cooperation of the fuse body; the heater is arranged on the outer wall of the joint and is used for actively heating the fuse body in a controllable manner; an insulating protective sleeve is further arranged outside the heater; the elastic mechanism is connected with the piston-like assembly and can bring the piston-like assembly out of the joint by using the elastic potential energy of the elastic mechanism after the fuse body is melted by the heater, so as to open the joint.

[0007] As a further preferred embodiment of the present application, when the fuse body is melted by the heater, the piston-like assembly is taken out of the joint by using the elastic potential energy of the elastic mechanism at the same time, and the melted fuse body is also taken out together with the piston-like assembly.

[0008] The elastic mechanism is a spring sheet or a spring ring.

[0009] As a further preferred embodiment of the present application, one end of the elastic mechanism is connected with the piston-like assembly, and the other end is connected with the outer wall of the joint.

[0010] As a further preferred embodiment of the present application, the joint has an internal thread, and a spring supporting base with a hollow structure is further arranged in the joint and is threadedly connected with the joint.

[0011] The spring supporting base with a hollow structure can ventilate; one end of the elastic mechanism is connected with the piston-like assembly, and the other end is connected with the spring supporting base with a hollow structure; the relative position of the spring supporting base with a hollow structure in the joint can be adjusted by threadedly connecting, so as to store the elastic potential energy of the elastic mechanism.

[0012] As a further preferred embodiment of the present application, the joint is a direct joint or a three-way joint.

[0013] As a further preferred embodiment of the present application, the heater is an electric resistance heater, an infrared heater or an electromagnetic induction heater.

[0014] As a further preferred embodiment of the present application, the port of the joint is a threaded connection port, an expansion joint connection port or a welded connection port.

[0015] The above technical scheme conceived by the present application, compared with the prior art, can achieve the following beneficial effects:

[0016] 1. The combustible refrigerant rapid discharge device of the present application has simple structure, low cost and fast response, and can effectively solve the safety problem caused by leakage of combustible refrigerant in an air conditioning system.

[0017] 2. The combustible refrigerant rapid discharge device of the present application can quickly open the internal passage of the discharge valve through the spring-piston mechanism under low pressure, and can achieve rapid discharge without relying on the pressure of the refrigerant in the air conditioning system. The driving force for the device to open is from the elastic structure, without the aid of external power.

[0018] 3. The combustible refrigerant rapid discharge device of the present application can be in a sealed and blocked state for a long time as a safety protection device. In the sealed and blocked state, the fuse completely fills the gap between the piston assembly and the inner wall of the joint (when the fuse is heated and melted by the heater, the elastic potential energy of the elastic mechanism is used to bring the piston assembly out of the joint, and the molten fuse is also taken out together with the piston assembly). In this way, taking the low-melting-point alloy (such as common lead-tin alloy and copper alloy) as an example, during the discharge process, the combustible refrigerant rapid discharge device of the present application opens the passage, and the piston device takes out the melted low-melting-point alloy from the pipeline with the help of the elastic force (that is, the low-melting-point alloy is heated and melted, and the piston device is no longer restricted by the low-melting-point alloy, at this time the piston device is quickly pulled out of the joint by the elastic force of the elastic mechanism, and the melted low-melting-point alloy is also taken out together with the piston device), avoiding the low-melting-point alloy being blown into the pipeline to cause other effects on the pipeline.

[0019] Flammable refrigerants are very common in existing refrigeration systems, such as R290, R1270, R600a, R600, R32, R161, R1234yf, etc. Although these refrigerants have good refrigeration application value, due to their flammability, safety needs extra attention. Taking an air conditioning system as an example, the active discharge device obtained by the utility model can ensure the sealing property under normal working of the refrigeration system on the one hand, and can actively open the channel to quickly connect the environment in the air conditioning system with the atmosphere environment, discharge the refrigerant in the outdoor system pipeline and the leaked refrigerant in the indoor unit environment to the outdoor environment, and avoid the safety problems caused by refrigerant leakage when the refrigerant leakage or fire is detected on the other hand.

[0020] Taking an air conditioning system as an example, the active flammable refrigerant in the utility model is applied to the air conditioning system, and the device can be installed on the outdoor unit and the indoor unit. For example, when the flammable refrigerant rapid discharge device is on the outdoor unit, one end of the flammable refrigerant rapid discharge device connector is connected with the outside, when the sensor detects the flammable refrigerant leakage or fire, the outside heater is started to heat, the joint and the internal fuse (such as low melting point alloy) are heated, the low melting point alloy is heated and rapidly heated, when the temperature is higher than the melting point, the low melting point alloy is heated and melted, at this time, when the pressure difference between the air conditioning system and the external environment is large, the channel can be quickly opened by the pressure difference to assist driving; when the flammable refrigerant rapid discharge device is on the indoor unit, at this time, the pressure difference between the air conditioning system and the external environment is small, or the internal environment pressure of the air conditioning is not large, and the discharge valve cannot be opened by relying on the pressure, the outside heater is started to heat, the joint and the internal fuse are heated, the low melting point alloy is heated and rapidly heated, when the temperature is higher than the melting point, the low melting point alloy is heated and melted, the elastic mechanism is used to quickly pull out the piston-like device from the joint, and the melted low melting point alloy is taken out at the same time. The channel connected with the external environment is quickly opened, so that the high pressure refrigerant in the system is quickly discharged to the atmosphere through the active discharge device. The flammable refrigerant rapid discharge device of the utility model has low cost, the low melting point alloy and the piston-like device fill the inside of the joint under the condition that the air conditioner works normally, and the internal refrigerant of the air conditioning system is reliably sealed and has no leakage.

[0021] In summary, the flammable refrigerant rapid discharge device in the utility model can realize active control of rapid discharge of flammable refrigerant, can be installed on the outdoor unit side or the indoor unit side, greatly improves the safety performance of the flammable refrigerant air conditioning system, and ensures that the pipeline system is completely sealed and has no leakage when the air conditioning system is normally used. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1It is a structure schematic view of a straight-through type combustible refrigerant quick discharge device (at this time, the elastic mechanism is a spring piece).

[0023] Figure 2 It is a structure schematic view of a three-way type combustible refrigerant quick discharge device.

[0024] Figure 3 It is a structure schematic view of a straight-through type combustible refrigerant quick discharge device (at this time, the elastic mechanism is a spring piece).

[0025] Figure 4 It is a structure schematic view of a straight-through type combustible refrigerant quick discharge device in an open channel state.

[0026] Figure 5 It is a structure schematic view of a straight-through type combustible refrigerant quick discharge device (the elastic mechanism is a spring, and compression energy storage).

[0027] Figure 6 It is a structure schematic view of a straight-through type combustible refrigerant quick discharge device in an open channel state.

[0028] Figure 7 It is a structure schematic view of a combustible refrigerant quick discharge device and application in an air conditioning system capable of realizing refrigeration and heat pump heating.

[0029] Figure 8 It is a structure schematic view of a combustible refrigerant quick discharge device and application control method in an air conditioning system capable of realizing only refrigeration.

[0030] The meanings of the reference numerals are as follows: 1 is an elastic mechanism, 2 is an insulation protective sleeve, 3 is a joint, 4 is a fuse body (such as a low-melting-point alloy), 5 is a piston-like assembly, 6 is a heater (such as an electric heater), 7 is a port, 8 is an outdoor heat exchanger, 9 is a compressor, 10 is a throttling valve, 11 is an indoor heat exchanger, 12 is a first active discharge device, 13 is a second active discharge device, 14 is a third active discharge device, 15 is a first combustible refrigerant detector, 16 is a second combustible refrigerant detector, 17 is a third combustible refrigerant detector, 18 is a four-way reversing valve, 19 is a sealing device, 20 is a spring support base with a hollow structure, 21 is an internal thread, 100 is a heating and refrigeration dual-function air conditioning operation system, and 101 is a single refrigeration function air conditioning system. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will make further detailed description to the utility model combined with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] Taking the joint as a metal joint (with a metal shell) and the fuse body as a low-melting-point alloy as an example (the melting point of the metal joint is higher than that of the fuse body):

[0033] Example 1:

[0034] The embodiment provides a straight-through combustible refrigerant rapid discharge device, as shown in Figure 1 , which comprises a joint 3, an electric heater 6, an insulating protective sleeve 2, a port 7, an elastic mechanism 1 (as shown in Figure 1 , a spring piece is used in the embodiment; of course, other elastic mechanisms such as a spring ring shown in Figure 3 may also be used), a piston-like device 5 and a low-melting-point alloy 4.

[0035] The piston-like device is installed in the joint 3, the low-melting-point alloy is filled in the gap between the joint 3 and the piston-like device, and the piston-like device is connected with the elastic device; at this time, the piston-like device is fixed by the solidified low-melting-point alloy, the channel is sealed, and the refrigerant and the atmospheric environment are isolated. When the low-melting-point alloy is heated and melted, the internal environment is connected with the atmospheric environment, and the refrigerant is discharged through the pipeline.

[0036] The combustible refrigerant rapid discharge device fills the joint 3 inside with the low-melting-point alloy and the piston-like device in the normal working state of the air conditioner, so that the refrigerant in the air conditioner system is reliably sealed and no leakage occurs. In addition to the electric heater, the heater can also be a resistance heater, an infrared heater, an electromagnetic induction heater and the like. The connection type of the port 7 includes threaded connection, expansion joint, welding and the like.

[0037] The combustible refrigerant rapid discharge device can be applied to an air conditioning system. When a sensor detects a combustible refrigerant leakage or a fire, etc., an electric heater is powered on. The electric heater generates heat rapidly after being powered on. The joint 3 and the low-melting-point alloy inside are heated. The low-melting-point alloy is heated and rapidly heated. When the temperature is higher than the melting point of the low-melting-point alloy, the low-melting-point alloy is heated and melted. When the pressure difference between the air conditioning system and the external environment is small, or the internal environment pressure of the air conditioning is not large, and the discharge valve cannot be opened by relying on the pressure, the external electric heater is started to heat. The joint 3 and the low-melting-point alloy inside are heated. The low-melting-point alloy is heated and rapidly heated. When the temperature is higher than the melting point of the low-melting-point alloy, the low-melting-point alloy is heated and melted. The elastic force mechanism is used to pull out the piston-like device from the joint 3, and the melted low-melting-point alloy is also taken out. When the channel is opened, the device is shown in Figure 4 The channel connected with the external environment is rapidly opened, so that the high-pressure refrigerant in the system is rapidly discharged to the atmosphere through the active discharge device.

[0038] Embodiment 2

[0039] This embodiment provides a three-way combustible refrigerant rapid discharge device, as shown in Figure 2 The device includes a joint 3, an electric heater 6, an insulating protective sleeve 2, a port 7, an elastic force mechanism 1 (a spring sheet is used in this embodiment), a piston-like device 5, and a low-melting-point alloy 4.

[0040] Similar to embodiment 1, the joint 3 is provided with a piston-like device. The low-melting-point alloy is filled in the gap between the joint 3 and the piston-like device. The piston-like device is connected with the elastic force device. At this time, the piston-like device is fixed by the solidified low-melting-point alloy. The channel is sealed, and the refrigerant and the atmospheric environment are isolated. When the low-melting-point alloy is heated and melted, the internal environment is connected with the atmospheric environment, and the refrigerant is discharged through the pipeline. The combustible refrigerant rapid discharge device ensures that the low-melting-point alloy and the piston-like device fill the joint 3 under the normal working state of the air conditioner, so that the refrigerant in the air conditioning system is reliably sealed and has no leakage. In addition to the electric heater, the heater can also be a resistance heater, an infrared heater, an electromagnetic induction heater, etc. The connection type of the port 7 includes threaded connection, expansion joint, welding, etc.

[0041] This rapid flammable refrigerant discharge device can be applied to air conditioning systems. When the sensor detects a flammable refrigerant leak or fire, the electric heater is energized. The heater rapidly heats up, heating the connector 3 and the internal low-melting-point alloy. The low-melting-point alloy heats up quickly, melting when the temperature exceeds its melting point. When the pressure difference between the air conditioning system and the external environment is small, or the internal pressure is too low to open the discharge valve by pressure alone, the external electric heater is activated to heat the connector 3 and the internal low-melting-point alloy. The alloy heats up rapidly, melting when the temperature exceeds its melting point. A spring mechanism then quickly pulls the piston-like device out of connector 3, carrying the molten alloy with it. The connection between the pipeline and the external environment is quickly opened, thus achieving the goal of rapidly discharging the high-pressure refrigerant in the system into the atmosphere via the active discharge device.

[0042] Example 3

[0043] This embodiment provides a direct-flow rapid discharge device for flammable refrigerants, such as... Figure 5 As shown, it includes connector 3, electric heater 6, insulating protective sleeve 2, port 7, spring mechanism 1, piston-like device 5, and low melting point alloy 4.

[0044] Unlike Example 1, the connector has an internal thread, while the hollow spring support has an external thread. The hollow spring support is threaded to the connector (the hollow spring support inside the connector allows for ventilation due to its hollow structure). The spring contacts the top of the hollow spring support, and the spring coil is connected to the piston-like device. A low-melting-point alloy is injected above the piston-like device. During installation, the spring support is screwed into the connector through the threads. Due to the fixing effect of the solid low-melting-point alloy, the piston-like device is fixed. At this time, the hollow spring support compresses the spring to store energy. When the low-melting-point alloy is heated and melted, the internal environment is connected to the atmospheric environment (e.g., Figure 6 As shown), the refrigerant is discharged through the pipeline. In normal operation of the air conditioner, the low-melting-point alloy fills the interior of joint 3 of the flammable refrigerant discharge device, ensuring reliable sealing and no leakage of the refrigerant inside the air conditioning system. The connection types of port 7 include threaded connection, expansion joint, and welding. When the electric heater is energized and heats the low-melting-point metal, the spring pushes the piston-like device outward, pushing the molten low-melting-point metal to the outside of the casing, thus quickly opening the discharge device. The driving force for the device's operation comes from the elastic structure and does not require external power. Besides electric heaters, the heater can also be a resistance heater, infrared heater, electromagnetic induction heater, etc.

[0045] The combustible refrigerant rapid discharge device can be applied to an air conditioning system. When a sensor detects a combustible refrigerant leakage or a fire, etc., the electric heater is powered on. The electric heater rapidly heats up after being powered on, and heats the joint 3 and the low-melting-point alloy inside. When the temperature of the low-melting-point alloy is higher than the melting point of the low-melting-point alloy, the low-melting-point alloy is heated and melted. When the pressure difference between the air conditioning system and the external environment is small, or the internal environment pressure of the air conditioning system is not large, and the discharge valve cannot be opened by relying on the pressure, the external electric heater is started to heat up, the joint 3 and the low-melting-point alloy inside are heated, and the low-melting-point alloy is rapidly heated and warmed up. When the temperature of the low-melting-point alloy is higher than the melting point of the low-melting-point alloy, the low-melting-point alloy is heated and melted. At this time, the spring is no longer limited by the low alloy melting point, and the potential energy is converted into kinetic energy, which rapidly pushes the piston-like device out of the joint. The melted low-melting-point alloy is taken out together with the piston-like device. The device diagram when the channel is opened is shown in Figure 6 . The channel connected with the pipeline and the external environment is rapidly opened, so as to realize the purpose of rapidly discharging the high-pressure refrigerant in the system to the atmosphere through the active discharge device.

[0046] Compared with example 1 and example 2, example 3 is more convenient to install, and the device structure is simpler. The potential energy is converted into kinetic energy by relying on compression energy, so as to realize the purpose of more rapidly pushing the piston-like device out of the joint.

[0047] Taking the application in the air conditioning system as an example, the straight-through combustible refrigerant rapid discharge device obtained by example 1 and the three-way combustible refrigerant rapid discharge device obtained by example 2 can be arranged on the outdoor unit and the indoor unit of the air conditioning system. When arranged on the outdoor unit, if the air conditioning system is a refrigeration-only air conditioning system, the combustible refrigerant rapid discharge device arranged on the outdoor unit can be provided with only one first active discharge device (as shown in Figure 8 , which is installed at the high-pressure end of the throttling valve, and one end of the joint of the combustible refrigerant rapid discharge device is connected with the outdoor unit); if the air conditioning system is a refrigeration and heating dual-function air conditioning system, the combustible refrigerant rapid discharge device arranged on the outdoor unit can be provided with two first active discharge devices and a second active discharge device (as shown in Figure 7 , which are respectively installed at the high-pressure end and the low-pressure end of the throttling valve, and one end of the joint of each combustible refrigerant rapid discharge device is connected with the outdoor unit). When arranged on the indoor unit, the combustible refrigerant rapid discharge device is connected with the indoor heat exchanger pipeline at one end of the joint (as shown in Figure 7 , Figure 8The third active discharge device is shown). Three flammable refrigerant detectors can be provided on the indoor unit (the three flammable refrigerant detectors can be referred to as a first flammable refrigerant detector, a second flammable refrigerant detector, and a third flammable refrigerant detector, two of which are located inside the heat exchange system, and one of which is located inside the indoor unit. The detailed detector working mode can also be referred to in CN118532784A and the like). According to the specific working state of the air conditioner (i.e., shutdown, refrigeration, and heating), the following are specific examples:

[0048] Example 4:

[0049] In the case of the air conditioning system in the shutdown state, as shown in Figure 7 , Figure 8 , the indoor unit air inlet damper and the indoor unit air outlet damper are in the closed state, and the first flammable refrigerant detector and the second flammable refrigerant detector are used to detect whether there is refrigerant leakage on the indoor side. When refrigerant leakage is detected, the compressor is started, and the refrigeration mode is set, i.e., the compressor exhaust port is connected to the outdoor heat exchanger, so that the refrigerant flows to the outdoor unit, and the fan of the outdoor unit is started, the electric heater of the first active discharge device is turned on to heat and melt the low-melting-point alloy, and the flammable refrigerant in the system is quickly discharged to the outdoor atmosphere. The discharge port of the first active discharge device is placed outside the outdoor unit housing to accelerate the diffusion and dilution of the discharged refrigerant.

[0050] Example 5:

[0051] In the case of the air conditioning system in the refrigeration running state, as shown in Figure 7 , Figure 8 , the first flammable refrigerant detector, the second flammable refrigerant detector, and the third flammable refrigerant detector are used to detect whether there is refrigerant leakage on the indoor side. When refrigerant leakage is detected, the indoor unit air inlet damper and the indoor unit air outlet damper are closed to prevent flammable refrigerant from continuing to leak into the indoor air. In the refrigeration running state, the compressor exhaust port is connected to the outdoor heat exchanger to pump the refrigerant in the indoor unit to the outdoor unit. The electric heater of the first active discharge device is turned on to heat and melt the low-melting-point alloy, and the flammable refrigerant in the system is quickly discharged to the outdoor atmosphere. The first active discharge device is connected to the bottom outlet of the outdoor heat exchanger. In the refrigeration running state, the condenser bottom outlet is a refrigerant liquid, and the density of the refrigerant liquid is much greater than that of the gas, so that the flammable refrigerant can be quickly discharged to the outdoor atmosphere. The discharge port of the first active discharge device is placed outside the outdoor unit housing to accelerate the diffusion and dilution of the discharged refrigerant.

[0052] When the pressure in the pipe and the ambient pressure are equal, the channel connected to the suction port of the compressor in the indoor unit is opened in the refrigeration state. At this time, the compressor is equivalent to a pump to pump the indoor side pipe, until the pressure in the indoor side pipe is less than or equal to one atmosphere, the electric heater of the active discharge device installed in the indoor side is turned on to heat and melt the low-melting-point alloy. At this time, the elastic mechanism uses the elastic force to pull out the piston-like device, and the already melted low-melting-point alloy is taken out together. The device diagram when the channel is opened is shown in Figure 4 、 6 The air enters the pipe under the action of the suction of the compressor, and the compressor pumps the air in the environment into the indoor refrigerant pipe and discharges it to the outdoor environment through the already opened channel on the outdoor side, reducing the leaked refrigerant gas in the indoor side.

[0053] Example 6:

[0054] In the case of the air conditioning system in the heating operation state, as shown in Figure 7 , the first combustible refrigerant detector, the second combustible refrigerant detector, and the third combustible refrigerant detector are used to detect whether there is refrigerant leakage in the indoor side. When the refrigerant leakage is detected, the indoor unit inlet and outlet dampers are closed to prevent the combustible refrigerant from continuing to leak into the indoor air. The compressor is switched to the refrigeration mode, that is, the compressor discharge port is connected to the outdoor heat exchanger, and the refrigerant in the indoor unit is pumped to the outdoor unit. At this time, the electric heater of the first active discharge device is turned on to heat and melt the low-melting-point alloy, and the low-melting-point alloy is taken out by the piston-like device under the action of the elastic force. The channel connected to the outside is opened, and the combustible refrigerant in the system is quickly discharged to the outdoor atmosphere. The first active discharge device is connected to the bottom outlet of the evaporator. In the original heating operation state, the refrigerant at the bottom outlet of the evaporator is in a two-phase state, and the discharge speed is limited. Therefore, the electric heater of the second active discharge device is turned on to heat and melt the low-melting-point alloy, and the combustible refrigerant in the indoor unit is quickly discharged to the outdoor atmosphere. In the original heating operation state, the bottom outlet of the condenser is a refrigerant liquid, and the density of the refrigerant liquid is much greater than that of the gas, so that the combustible refrigerant can be quickly discharged to the outdoor atmosphere. The discharge ports of the first active discharge device and the second active discharge device are placed outside the outdoor unit shell to accelerate the diffusion and dilution of the discharged refrigerant.

[0055] When the pressure in the pipe and the ambient pressure are equal, the channel connected to the suction port of the compressor in the indoor unit is opened in the refrigeration state. At this time, the compressor is equivalent to a pump to pump the indoor side pipe, until the pressure in the indoor side pipe is less than or equal to one atmosphere, the electric heater of the active discharge device installed in the indoor side is turned on to heat and melt the low-melting-point alloy. At this time, the elastic mechanism uses the elastic force to pull out the piston-like device, and the already melted low-melting-point alloy is taken out together. The device diagram when the channel is opened is shown inFigure 4 、 6 Air enters the pipe under the action of the suction of the compressor, the compressor draws the air in the environment into the indoor side refrigerant pipe and discharges it to the outdoor environment through the channel that has been opened on the outdoor side, reducing the refrigerant gas that has leaked on the indoor side.

[0056] Through the above embodiments, it is not difficult to see that the combustible refrigerant rapid discharge device obtained by the utility model can achieve the effect of rapidly discharging the combustible refrigerant to the outdoor atmosphere under different operating states of shutdown, refrigeration and heating when the sensor detects that there is combustible refrigerant leakage or fire on the indoor side.

[0057] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A flammable refrigerant quick drain device characterized by, The device comprises an elastic mechanism (1), a piston-like assembly (5), a heater (6) and a joint (3), wherein the joint (3) is a channel for the discharge of flammable refrigerant; the piston-like assembly (5) is contained in the joint (3), and the gap between the piston-like assembly (5) and the inner wall of the joint (3) is completely filled with a solid-state fuse located outside the piston-like assembly (5), so that the piston-like assembly (5) can seal and block the joint (3) under the cooperation of the fuse; the heater (6) is arranged on the outer wall of the joint (3) and is used for actively heating the fuse in a controllable manner; the heater (6) is further provided with an insulating protective sleeve (2); the elastic mechanism (1) is connected with the piston-like assembly (5) and can drive the piston-like assembly (5) out of the joint (3) by using the elastic potential energy of the elastic mechanism (1) after the fuse is melted by the heater (6), so as to open the joint (3).

2. The combustible refrigerant rapid discharge device of claim 1, wherein, When the fuse is melted by the heater (6), the piston-like assembly (5) is driven out of the joint (3) by using the elastic potential energy of the elastic mechanism (1) at the same time, and the melted fuse is also driven out of the joint (3) together with the piston-like assembly (5). The elastic mechanism (1) is a spring sheet or a spring ring.

3. The combustible refrigerant rapid discharge device of claim 1, wherein, One end of the elastic mechanism (1) is connected with the piston-like assembly (5), and the other end is connected with the outer wall of the joint (3).

4. The combustible refrigerant rapid discharge device of claim 1, wherein, The joint (3) has an internal thread (21), and a hollow spring support base (20) is further arranged in the joint (3), and the spring support base (20) is threadedly connected with the joint (3). The spring support base (20) can ventilate; one end of the elastic mechanism (1) is connected with the piston-like assembly (5), and the other end is connected with the spring support base (20); and the relative position of the spring support base (20) in the joint (3) can be adjusted by thread connection, so that the elastic mechanism (1) can store elastic potential energy.

5. The combustible refrigerant rapid discharge device of claim 1, wherein, The joint (3) is a direct joint or a three-way joint.

6. The combustible refrigerant rapid discharge device of claim 1, wherein, The heater (6) is an electric resistance heater, an infrared heater or an electromagnetic induction heater.

7. The combustible refrigerant rapid discharge device of claim 1, wherein, The port (7) of the joint (3) is a threaded connection port, an expansion connection port or a welded connection port.

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