Outdoor unit, anti-explosion control method, control device and air conditioner

Abstract

The invention relates to the technical field of air conditioners, and discloses an outdoor unit, an anti-explosion control method, a control device and an air conditioner. The outdoor unit comprises an outdoor unit shell and an exhaust module. A press bin is formed in the outer machine shell. The exhaust module is installed on the outer machine shell and used for exhausting gas in the press bin. The anti-explosion control method comprises the steps that a refrigerant concentration field in a compressor bin is constructed based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector; based on the constructed refrigerant concentration field, the maximum refrigerant concentration value in the compressor bin is determined; and under the condition that the maximum refrigerant concentration value is larger than a first refrigerant concentration threshold value, the exhaust module is controlled to be started so as to exhaust gas in the compressor bin, and the first refrigerant concentration threshold value is smaller than the refrigerant explosion limit concentration. The problem that explosion cannot be fundamentally avoided due to the fact that the flammable and explosive gas prevention and control means in the prior art cannot intervene in the concentration of the flammable and explosive gas in real time is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to an outdoor unit, an explosion-proof control method, a control device and an air conditioner. BACKGROUND

[0002] At present, air conditioners have become essential appliances for adjusting the living and working environment. An air conditioning system is composed of an indoor unit and an outdoor unit, and the two are connected through a refrigerant pipeline to form a refrigerant circulation loop to realize functions such as refrigeration and heating.

[0003] With the increase of the service life of the refrigerant pipeline, the risk of refrigerant leakage gradually increases. If the leaked refrigerant is flammable refrigerant (such as R290), it may cause serious safety hazards. The minimum ignition energy of R290 is extremely low (only 0.28 mJ), and it is extremely easy to be ignited near high-temperature areas such as compressor cabins or electrical equipment, leading to explosion accidents.

[0004] At present, the prevention and control means for flammable and explosive gases mainly rely on monitoring whether the concentration is within the explosion limit range. Once the safety threshold is exceeded, an alarm is triggered, and corresponding measures are taken by the control terminal. However, this method lacks a direct and effective mechanism to reduce the concentration of flammable gas, and cannot keep the gas concentration below the lower explosion limit through real-time intervention, thereby fundamentally avoiding explosion. SUMMARY

[0005] The present application provides an outdoor unit, an explosion-proof control method, a control device and an air conditioner to solve the problem that the existing prevention and control means for flammable and explosive gases cannot intervene in the concentration of flammable gas in real time, resulting in the inability to fundamentally avoid explosion.

[0006] The present application provides an outdoor unit, an explosion-proof control method, a control device and an air conditioner to solve the problem that the existing prevention and control means for flammable and explosive gases cannot intervene in the concentration of flammable gas in real time, resulting in the inability to fundamentally avoid explosion. The outdoor unit comprises: An exhaust module is installed in the compressor chamber for exhausting the gas in the compressor chamber.

[0007] According to the outdoor unit provided by the present application, the exhaust module comprises an exhaust fan and a support frame; the exhaust fan is installed in the compressor chamber through the support frame.

[0008] According to the outdoor unit provided by the present application, the outdoor unit further comprises a refrigerant concentration detection module, which comprises: A plurality of refrigerant concentration detectors are installed in the compressor chamber; the plurality of refrigerant concentration detectors are arranged on the outer periphery of the compressor; at least two refrigerant concentration detectors are arranged in the axial direction of the compressor, and / or at least two refrigerant concentration detectors are arranged in the radial direction of the compressor.

[0009] The outdoor unit provided by the application further comprises: An inert gas discharging module is installed in the compressor chamber and used for discharging inert gas into the compressor chamber.

[0010] The second aspect of the application provides an explosion-proof control method for an outdoor unit, which is used for any of the above-mentioned outdoor units, and the explosion-proof control method comprises the following steps: Based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector, a refrigerant concentration field in the compressor chamber is constructed; Based on the constructed refrigerant concentration field, a maximum refrigerant concentration value in the compressor chamber is determined; In the case where the maximum refrigerant concentration value is greater than a first refrigerant concentration threshold value, the exhaust module is controlled to start to discharge the gas in the compressor chamber, and the first refrigerant concentration threshold value is less than the refrigerant explosion limit concentration.

[0011] The explosion-proof control method for the outdoor unit provided by the application further comprises the following steps after the step of "determining the maximum refrigerant concentration value in the compressor chamber": In the case where the maximum refrigerant concentration value is greater than a second refrigerant concentration threshold value, the compressor is controlled to be powered off and the throttle valve is controlled to be closed; The second refrigerant concentration threshold value is greater than the first refrigerant concentration threshold value and less than the refrigerant explosion limit concentration.

[0012] The explosion-proof control method for the outdoor unit provided by the application further comprises the following steps after the step of "determining the maximum refrigerant concentration value in the compressor chamber": In the case where the maximum refrigerant concentration value is greater than a third refrigerant concentration threshold value, the inert gas discharging module is controlled to discharge inert gas into the compressor chamber; The third refrigerant concentration threshold value is less than the refrigerant explosion limit concentration and greater than the second refrigerant concentration threshold value.

[0013] The explosion-proof control method for the outdoor unit provided by the application further comprises the following steps before the step of "constructing the refrigerant concentration field in the compressor chamber based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector": An XYZ coordinate system is established with a reference point as the coordinate origin in the compressor chamber; Based on the XYZ coordinate system, the position coordinates of each refrigerant concentration detector are determined.

[0014] The third aspect of the application provides an explosion-proof control device for an outdoor unit, which comprises: A first determination module is configured to construct a refrigerant concentration field in the compressor chamber based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector. a second determining module, configured to determine a maximum refrigerant concentration value in the pressurizing chamber based on the constructed refrigerant concentration field; a control module, configured to control the exhaust module to start to exhaust the gas in the pressurizing chamber when the maximum refrigerant concentration value is greater than the first refrigerant concentration threshold, and the first refrigerant concentration threshold is less than the refrigerant explosion limit concentration.

[0015] The fourth aspect of the present application provides an air conditioner, which comprises the outdoor unit and the explosion-proof control device.

[0016] The outdoor unit provided by the present application can exhaust the gas in the pressurizing chamber in time through the exhaust module, avoids the accumulation of the leaked refrigerant in the pressurizing chamber, and keeps the concentration of the refrigerant below the refrigerant explosion limit concentration, thereby solving the problem that the explosion-proof means for the flammable and explosive gas in the prior art cannot intervene in the concentration of the flammable gas in real time, and thus cannot fundamentally avoid the explosion.

[0017] The explosion-proof control method of the outdoor unit provided by the present application can construct the refrigerant concentration field in the pressurizing chamber by obtaining the position coordinates and the actual refrigerant concentration of the plurality of refrigerant concentration detectors. Based on the constructed refrigerant concentration field, the control device can accurately locate and calculate the maximum refrigerant concentration value in the current pressurizing chamber. This value represents the actual concentration of the most dangerous and most likely to reach the explosion limit area. The problems of the monitoring hysteresis and inaccuracy of the traditional explosion-proof means can be completely solved, and instead of passively waiting for the concentration of a certain point to exceed the standard, the highest risk point is actively and globally searched, and the most accurate assessment of the overall risk level is made. This is the prerequisite and decision basis for realizing "real-time intervention". Finally, the maximum refrigerant concentration value is compared with the first refrigerant concentration threshold, and when the maximum refrigerant concentration value is greater than the first refrigerant concentration threshold, the control device controls the exhaust module to start to exhaust the gas in the pressurizing chamber, so that the exhaust module can be started decisively before the explosion risk is far from being formed, and the purpose of preventing explosion is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is one of the structural schematic diagrams of the outdoor unit provided by the present application.

[0020] Figure 2 is the second structural schematic diagram of the outdoor unit provided by the present application.

[0021] Figure 3 is Figure 2 is an enlarged structural schematic view of A in the middle.

[0022] Figure 4 is one of flow schematic diagrams of the explosion-proof control method of the outdoor unit provided by the application.

[0023] Figure 5 is another flow schematic diagram of the explosion-proof control method of the outdoor unit provided by the application.

[0024] Figure 6 is a structural schematic diagram of the explosion-proof control device of the outdoor unit provided by the application.

[0025] Figure 7 is a structural schematic diagram of the electronic device provided by the application.

[0026] Reference signs: 110, outdoor machine shell; 101, press machine bin; 120, exhaust module; 121, exhaust fan; 122, support frame. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the specification, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] In the present specification, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0031] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present specification. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification and the features of different embodiments or examples without contradiction.

[0032] In the embodiments of the present specification, "at least one" means one or more, and "multiple" means two or more. The association relationship of the associated objects is described, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B, and the existence of B alone.

[0033] The following will be described in combination with Figures 1 to 7The application discloses an outdoor unit, an explosion-proof control method, a control device and an air conditioner. Before the embodiment of the application is described in detail, the whole application scenario is described. The explosion-proof control method of the outdoor unit can be applied to the air conditioner, the cloud platform in the Internet field, or the cloud platform in other kinds of Internet fields, or a third-party device. The third-party device can include a mobile phone, a tablet computer, a notebook computer, a vehicle-mounted computer and other smart terminals.

[0034] The execution subject of the explosion-proof control method of the outdoor unit in the embodiment of the application can be the air conditioner or the control device of the embodiment of the application. The execution subject is taken as the control device for example and described below.

[0035] As shown in Figures 1 to 3 The first aspect of the embodiment of the application provides an outdoor unit. The outdoor unit comprises an outdoor shell 110 and an exhaust module.

[0036] The outdoor shell 110 is formed with a compressor chamber 101. The exhaust module is installed on the outdoor shell 110 and is used for exhausting the gas in the compressor chamber 101.

[0037] In the embodiment, the gas in the compressor chamber 101 can be exhausted in time through the exhaust module, the leaked refrigerant is prevented from gathering in the compressor chamber 101, the concentration of the refrigerant is always below the explosive limit concentration of the refrigerant, the problem that the explosion cannot be fundamentally avoided because the concentration of the combustible gas cannot be intervened in real time by the explosion-proof means for the flammable and explosive gas in the prior art is solved.

[0038] The application changes the safety strategy from passive and lagging concentration monitoring and alarm to active and real-time concentration control and elimination through the simple mechanical structure of the exhaust module. The combustible refrigerant is actively exhausted from the dangerous area by continuously generating negative pressure and air flow, so that the accumulation process of the concentration of the combustible gas is interrupted in time and space, and the combustible gas has no opportunity to reach the explosion limit, the source treatment and essential safety of the explosion risk are realized.

[0039] Optionally, the exhaust module is an air outlet formed in the outdoor shell 110, the air outlet is communicated with the compressor chamber 101, and the gas in the compressor chamber 101 is diffused to the outdoor.

[0040] Optionally, the exhaust module comprises an exhaust fan 121 and a support frame 122; the exhaust fan 121 is installed on the compressor cabin 101 through the support frame 122. In this embodiment, the exhaust fan 121 can generate a strong directional airflow. Compared with a simple opening, opening or air duct, the fan can actively and forcibly extract the cabin gas and discharge it to the outdoor, ensuring sufficient air change rate (ACH). This is crucial for quickly diluting and discharging R290 refrigerant (which is usually accumulated at the bottom) that is heavier than air. The exhaust fan 121 is a mature, standardized and miniaturized component. It can be easily integrated into the existing outdoor unit structure design without making major changes to the overall layout of the compressor cabin. There is generally no ready-made position or structure on the existing outdoor unit shell 110 that is suitable for directly installing the fan. The support frame 122 serves as an adapter structure to solve the interface mismatch problem. By designing support frames 122 of different shapes, the exhaust fan 121 can be flexibly fixed at the most effective exhaust position.

[0041] Illustratively, an exhaust port is formed on the outdoor unit shell 110; the support frame 122 is installed at the bottom of the outdoor unit shell 110, and the air outlet side of the exhaust fan 121 faces the exhaust port. After the exhaust fan 121 is started, the gas in the compressor cabin 101 can be discharged out of the compressor cabin 101.

[0042] Optionally, a filter screen is installed in the exhaust port.

[0043] In some embodiments of the present application, the outdoor unit further comprises a refrigerant concentration detection module, the refrigerant concentration detection module comprises a plurality of refrigerant concentration detectors, and a compressor is installed in the compressor cabin 101; the plurality of refrigerant concentration detectors are arranged around the compressor; at least two refrigerant concentration detectors are arranged in the axial direction of the compressor, and / or at least two refrigerant concentration detectors are arranged in the radial direction of the compressor.

[0044] The existing outdoor unit generally installs one or more refrigerant concentration sensors in the compressor cabin 101. Once a single sensor fails (such as poisoning, drift, damage), the entire monitoring system of the outdoor unit will completely malfunction, causing great safety hazards. In this embodiment, the plurality of refrigerant concentration detectors constitute a redundant system. Even if one of them fails, the other refrigerant concentration detectors can still work normally, and the overall reliability of the system is improved by orders of magnitude. In addition, the arrangement of at least two refrigerant concentration detectors in the axial direction of the compressor and / or the arrangement of at least two refrigerant concentration detectors in the radial direction of the compressor can realize the detection of the refrigerant concentration at different positions in the compressor cabin 101 with the compressor as the reference point, thereby improving the accuracy of the refrigerant concentration.

[0045] Optionally, a refrigerant concentration detector is installed at the bottom of the compressor compartment 101. Considering that some flammable refrigerants, such as R290, have a density greater than air and will sink after leaking into the compressor compartment 101, installing a refrigerant concentration detector at the bottom of the compressor compartment 101 can detect the refrigerant concentration at the bottom of the compartment in real time.

[0046] Optionally, the refrigerant concentration detection module includes four refrigerant concentration detectors; the four detectors are tetrahedral, with the center of gravity of each tetrahedron located on the central axis of the compressor. This arrangement allows for the detection of refrigerant concentration around the compressor.

[0047] For example, the center of the tetrahedron coincides with the center of gravity of the compressor. An XYZ spatial coordinate system is established with the compressor's center of gravity as the origin, which facilitates labeling the position coordinates of the four refrigerant concentration detectors.

[0048] For example, the refrigerant concentration detector is a non-dispersive infrared sensor (NDIR). An NDIR sensor is an optical sensor used to detect the concentration of a specific gas. It works based on the principle of selective absorption of infrared light by gas molecules and is commercially available; therefore, it will not be described in detail in the embodiments of this invention.

[0049] In some embodiments, the outdoor unit further includes an inert gas emission module. The inert gas emission module is installed in the compressor compartment 101 and is used to discharge inert gas into the compressor compartment 101.

[0050] In this embodiment, by releasing inert gases (such as nitrogen, carbon dioxide, etc.) into the compressor compartment, the oxygen concentration inside the compartment can be directly reduced. Even if a serious leak of R290 refrigerant occurs, and its concentration reaches the explosive range, the combustion reaction cannot occur because the oxygen concentration inside the compartment has been diluted below the lower limit of combustion by the inert gases. This is equivalent to creating a "suffocating" environment for the compressor compartment, completely eliminating the conditions for an explosion from a physicochemical perspective.

[0051] Optionally, the inert gas includes at least one of nitrogen, carbon dioxide, argon and helium.

[0052] Optionally, the inert gas emission module includes a storage tank and a nozzle; the storage tank stores inert gas, and a nozzle is installed at the outlet of the storage tank, which sprays inert gas into the compressor chamber 101 when it is open.

[0053] like Figure 4 As shown, a specific embodiment of the second aspect of the present invention provides an explosion-proof control method for an outdoor unit, used in any of the above embodiments. The explosion-proof control method includes: S100, constructing a refrigerant concentration field in the pressurized cabin based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector.

[0054] Specifically, the control device is electrically connected with each refrigerant concentration detector, and the refrigerant concentration detector is used to detect the actual refrigerant concentration at the position where the refrigerant concentration detector is located. The control device obtains the actual refrigerant concentration at the coordinate position from the refrigerant concentration detector, and then constructs a refrigerant concentration field in the pressurized cabin according to the built-in algorithm (for example, inverse distance weighting method). In this way, the refrigerant concentration is associated with the position, and the actual refrigerant concentration at different positions can be determined.

[0055] S200, determining the maximum refrigerant concentration value in the pressurized cabin based on the constructed refrigerant concentration field.

[0056] Specifically, the control device can determine the maximum refrigerant concentration value in the pressurized cabin and the position coordinates of the maximum refrigerant concentration value based on the constructed refrigerant concentration field.

[0057] S300, in the case that the maximum refrigerant concentration value is greater than the first refrigerant concentration threshold value, controlling the exhaust module to start to exhaust the gas in the pressurized cabin, so that the first refrigerant concentration threshold value is less than the refrigerant explosion limit concentration.

[0058] The traditional method usually relies on 1 or 2 fixed position concentration sensors, compares the concentration value detected by the concentration sensor with the traditional alarm concentration threshold value, and alarms in the case that the concentration value is greater than the traditional alarm concentration threshold value, to remind the user that there is an explosion danger. Because some refrigerants, such as R290, are heavier than air, they will accumulate in low places and form uneven concentration distribution, and the reading of a single sensor may seriously underestimate the highest concentration (i.e. the most dangerous point) actually existing in the cabin, or respond slowly due to improper installation position.

[0059] In the embodiment, by acquiring the position coordinates and actual refrigerant concentration of the plurality of refrigerant concentration detectors, a refrigerant concentration field in the compressor chamber can be constructed. Based on the constructed refrigerant concentration field, the control device can accurately locate and calculate the "maximum refrigerant concentration value" in the current compressor chamber. This value represents the actual concentration of the current most dangerous and most likely to reach the explosion limit area. The problems of monitoring lag and inaccuracy existing in traditional explosion prevention methods can be completely solved, and instead of passively waiting for the concentration of a certain point to exceed the standard, the highest risk point is actively and globally searched, and the most accurate assessment of the overall risk level is made. This is the prerequisite and decision basis for "real-time intervention". Finally, the maximum refrigerant concentration value is compared with the first refrigerant concentration threshold value, and in the case that the maximum refrigerant concentration value is greater than the first refrigerant concentration threshold value, the control device controls the exhaust module to start to exhaust the gas in the compressor chamber. In this way, the exhaust module can be started decisively before the explosion risk is far from being formed, and the purpose of preventing explosion is achieved.

[0060] Optionally, the control device can use the existing spatial difference method and combine the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector to construct the refrigerant concentration field in the compressor chamber. The spatial difference method belongs to the prior art and will not be described here. In the embodiments of the present application, the specific method for constructing the refrigerant concentration field is not limited.

[0061] Optionally, the first refrigerant concentration threshold value is less than the refrigerant explosion limit concentration and also less than the traditional alarm concentration threshold value.

[0062] Illustratively, the outdoor unit includes four refrigerant concentration detectors arranged around the compressor in a tetrahedral layout. The four refrigerant concentration detectors are located at the four vertices of a regular tetrahedron, the center of gravity of the compressor is the center of the tetrahedron, and the distance between each refrigerant concentration detector and the center of gravity of the compressor is L, for example, 150 mm.

[0063] First, near the compressor, the concentration field of the refrigerant concentration can be approximated as a phenomenon change, as shown in formula (1).

[0064] Formula (1).

[0065] Wherein, is the refrigerant concentration at any point (x, y, z) in the compressor chamber; is the refrigerant concentration of the reference point, i.e. the coordinate origin; , and are the gradients of the refrigerant concentration in the X, Y and Z axis directions, respectively, with a unit of concentration / length, for example, pg / m 3 / mm.

[0066] Then, the XYZ coordinate system is established with the gravity center of the compressor as the coordinate origin.

[0067] The control device can calculate the position coordinates of the four refrigerant concentration detectors in the current coordinate system in combination with the built-in algorithm.

[0068] For example, first, the control device normalizes the four vertices of the regular tetrahedron, wherein the normalized coordinate of the first refrigerant concentration detector is (1, 1, -1), the normalized coordinate of the second refrigerant concentration detector is (1, -1, -1), the normalized coordinate of the third refrigerant concentration detector is (-1, 1, -1), and the normalized coordinate of the fourth refrigerant concentration detector is (-1, -1, -1); then, the control device determines the scaling factor k according to the distance (for example, 150 mm) between the coordinate origin and the refrigerant concentration detector and according to formula (3). Formula (3). In formula (3), ; L is the distance between the coordinate origin and the refrigerant concentration detector, for example, L = 150 mm. Finally, the actual coordinates between each refrigerant concentration detector can be determined. The normalized coordinate of the first refrigerant concentration detector is (86.6, 86.6, -86.6), the normalized coordinate of the second refrigerant concentration detector is (86.6, -86.6, -86.6), the normalized coordinate of the third refrigerant concentration detector is (-86.6, 86.6, -86.6), and the normalized coordinate of the fourth refrigerant concentration detector is (-86.6, -86.6, -86.6).

[0069] The control device establishes equation set (2) according to the position coordinates of the four refrigerant concentration detectors and the actual refrigerant concentrations detected by the corresponding refrigerant concentration detectors .

[0070] Equation set (2).

[0071] By solving equation set (2), the following can be obtained , , and .

[0072] The and obtained by solving equation set (2) , , and are brought into formula (1), and the refrigerant distribution in the compressor can be obtained.

[0073] For example,Figure 5 As shown, in some embodiments of the present invention, after "determining the maximum refrigerant concentration value in the compressor compartment", the method further includes: When the maximum refrigerant concentration value is greater than the second refrigerant concentration threshold, the compressor is powered off and the throttle valve is closed; wherein the second refrigerant concentration threshold is greater than the first refrigerant concentration threshold but less than the refrigerant explosion limit concentration.

[0074] In this embodiment, by comparing the maximum refrigerant concentration with the second refrigerant concentration threshold, once the maximum refrigerant concentration exceeds the second refrigerant concentration threshold, it indicates that emergency intervention is required. This step can delay the time when the refrigerant concentration inside the compressor compartment reaches the refrigerant explosion limit concentration.

[0075] like Figure 5 As shown, in some embodiments of the present invention, after "determining the maximum refrigerant concentration value in the compressor compartment", the method further includes: When the maximum refrigerant concentration is greater than the third refrigerant concentration threshold, the inert gas emission module is controlled to emit inert gas into the compressor chamber; the third refrigerant concentration threshold is less than the refrigerant explosion limit concentration and greater than the second refrigerant concentration threshold.

[0076] In this embodiment, when the maximum refrigerant concentration exceeds the first threshold, the control device first attempts to resolve the issue using the venting module. If this is ineffective, the maximum refrigerant concentration continues to rise to the second refrigerant concentration threshold, indicating the need for emergency intervention. This step can delay the time it takes for the refrigerant concentration inside the compressor compartment to reach the refrigerant explosion limit. If this is still ineffective, the maximum refrigerant concentration continues to rise to the third refrigerant concentration threshold, indicating that the situation is worsening. At this point, there is sufficient reason and basis to initiate the highest level of response measures without appearing to be an overreaction or underreaction.

[0077] In some embodiments of the present invention, before "constructing the refrigerant concentration field within the compressor compartment based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector", the method further includes: Establish an XYZ coordinate system within the compressor chamber with the reference point as the origin; Based on the XYZ coordinate system, the position coordinates of each refrigerant concentration detector are determined.

[0078] In this embodiment, concentration information is directly associated with location coordinates, thus providing a basis for the refrigerant concentration distribution within the compressor compartment. Establishing an XYZ coordinate system with a reference point as the origin simplifies the algorithm and reduces computational complexity.

[0079] like Figure 5 As shown, by way of example, this embodiment provides an explosion-proof control method for an outdoor unit. The explosion-proof control method for the outdoor unit includes: S100, constructing a refrigerant concentration field in the compressor chamber based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector .

[0080] S200, determining a maximum refrigerant concentration value Cmax in the compressor chamber based on the constructed refrigerant concentration field.

[0081] S310, determining whether the maximum refrigerant concentration value Cmax is less than a first refrigerant concentration threshold C1; if yes, controlling the outdoor unit to maintain the current operating state; if no, proceeding to S320.

[0082] S320, determining whether the maximum refrigerant concentration value Cmax is less than a second refrigerant concentration threshold C2; if yes, controlling the exhaust module to start to exhaust the gas in the compressor chamber; if no, proceeding to S330.

[0083] S330, determining whether the maximum refrigerant concentration value Cmax is less than a third refrigerant concentration threshold C3; if yes, controlling the compressor to be powered off and the throttle valve to be closed; if no, proceeding to S340.

[0084] S340, controlling the inert gas discharge module to discharge inert gas into the compressor chamber.

[0085] As Figure 6 shown, the specific embodiment of the third aspect of the present application provides an explosion-proof control device of an outdoor unit. The explosion-proof control device of the outdoor unit comprises a first determination module, a second determination module and a control module.

[0086] The first determination module is configured to construct a refrigerant concentration field in the compressor chamber based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector. The second determination module is configured to determine a maximum refrigerant concentration value in the compressor chamber based on the constructed refrigerant concentration field. The control module is configured to control the exhaust module to start to exhaust the gas in the compressor chamber in the case that the maximum refrigerant concentration value is greater than a first refrigerant concentration threshold, so that the first refrigerant concentration threshold is less than the refrigerant explosion limit concentration.

[0087] In the embodiment, by acquiring the position coordinates and the actual refrigerant concentration of the plurality of refrigerant concentration detectors, the refrigerant concentration field in the pressurized chamber can be constructed. Based on the constructed refrigerant concentration field, the control device can accurately locate and calculate the "maximum refrigerant concentration value" in the current pressurized chamber. This value represents the actual concentration of the current most dangerous and most likely to reach the explosion limit area. The problems of monitoring lag and inaccuracy existing in the traditional explosion prevention means can be completely solved, and instead of passively waiting for the concentration of a certain point to exceed the standard, the highest risk point is actively and globally searched, and the most accurate assessment of the overall risk level is made. This is the prerequisite and decision basis for realizing "real-time intervention". Finally, the maximum refrigerant concentration value is compared with the first refrigerant concentration threshold value, and in the case that the maximum refrigerant concentration value is greater than the first refrigerant concentration threshold value, the control device controls the exhaust module to start to exhaust the gas in the pressurized chamber, so that the exhaust module can be started decisively before the explosion risk is far from being formed, and the purpose of preventing explosion is achieved.

[0088] Specific embodiments of the fourth aspect of the present application provide an air conditioner. The air conditioner comprises the outdoor unit of any of the above embodiments and the explosion-proof control device of any of the above embodiments.

[0089] Because the air conditioner of the embodiment comprises the outdoor unit of any of the above embodiments and further comprises the explosion-proof control device of any of the above embodiments, at least the above advantages are achieved, which will not be described here.

[0090] Figure 7 An example of a schematic diagram of a physical structure of an electronic device is shown in Figure 7 As shown, the electronic device can include a processor 810, a communications interface 820, a memory 830, and a communications bus 840, wherein the processor 810, the communications interface 820, and the memory 830 complete communication with each other through the communications bus 840. The processor 810 can invoke the logic instructions in the memory 830 to execute the explosion-proof control method of the outdoor unit, which includes: based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector, constructing a refrigerant concentration field in the pressurized chamber; based on the constructed refrigerant concentration field, determining the maximum refrigerant concentration value in the pressurized chamber; in the case that the maximum refrigerant concentration value is greater than the first refrigerant concentration threshold value, controlling the exhaust module to start to exhaust the gas in the pressurized chamber, so that the first refrigerant concentration threshold value is less than the refrigerant explosion limit concentration.

[0091] Further, the logic instructions in the memory 830 described above can be implemented in the form of software functional units and sold or used as independent products, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0092] In another aspect, the present application also provides a computer program product, which comprises a computer program, the computer program can be stored on a non-transitory computer readable storage medium, and the computer program is executed by a processor, so that the computer can execute the anti-explosion control method of the outdoor unit provided by the above-mentioned methods. The method comprises the following steps: constructing a refrigerant concentration field in the compressor chamber based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector; determining the maximum refrigerant concentration value in the compressor chamber based on the constructed refrigerant concentration field; and in the case that the maximum refrigerant concentration value is greater than a first refrigerant concentration threshold value, controlling the exhaust module to start to exhaust the gas in the compressor chamber, so that the first refrigerant concentration threshold value is less than the refrigerant explosion limit concentration.

[0093] In another aspect, the present application also provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the anti-explosion control method of the outdoor unit provided by the above-mentioned methods. The method comprises the following steps: constructing a refrigerant concentration field in the compressor chamber based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector; determining the maximum refrigerant concentration value in the compressor chamber based on the constructed refrigerant concentration field; and in the case that the maximum refrigerant concentration value is greater than a first refrigerant concentration threshold value, controlling the exhaust module to start to exhaust the gas in the compressor chamber, so that the first refrigerant concentration threshold value is less than the refrigerant explosion limit concentration.

[0094] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0095] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0096] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An outdoor unit, characterized in that, include: The outer casing (110) has a compressor chamber (101) formed inside it. An exhaust module (120) is installed in the compressor chamber (101) to exhaust the gas inside the compressor chamber (101).

2. The outdoor unit according to claim 1, characterized in that, The exhaust module (120) includes an exhaust fan (121) and a support frame (122); the exhaust fan (121) is installed in the compressor chamber (101) via the support frame (122).

3. The outdoor unit according to claim 1, characterized in that, It also includes a refrigerant concentration detection module, which includes: Multiple refrigerant concentration detectors are provided, and a compressor is installed in the compressor compartment (101); the multiple refrigerant concentration detectors are arranged around the outer periphery of the compressor; at least two of the refrigerant concentration detectors are arranged at an axial distance from the compressor, and / or at least two of the refrigerant concentration detectors are arranged at a radial distance from the compressor.

4. The outdoor unit according to any one of claims 1 to 3, characterized in that, Also includes: An inert gas emission module is installed in the compressor chamber (101) for emitting inert gas into the compressor chamber (101).

5. An explosion-proof control method for an outdoor unit, characterized in that, For an outdoor unit according to any one of claims 1 to 4, the explosion-proof control method includes: Based on the location coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector, a refrigerant concentration field is constructed within the compressor compartment; Based on the constructed refrigerant concentration field, the maximum refrigerant concentration value in the compressor compartment is determined; If the maximum refrigerant concentration value is greater than the first refrigerant concentration threshold, the exhaust module is activated to discharge the gas in the compressor chamber, so that the first refrigerant concentration threshold is less than the refrigerant explosion limit concentration.

6. The explosion-proof control method for an outdoor unit according to claim 5, characterized in that, Following the step of "determining the maximum refrigerant concentration value within the compressor compartment," the following is also included: If the maximum refrigerant concentration value is greater than the second refrigerant concentration threshold, the compressor is powered off and the throttle valve is closed. Wherein, the second refrigerant concentration threshold is greater than the first refrigerant concentration threshold, but less than the refrigerant explosion limit concentration.

7. The explosion-proof control method for an outdoor unit according to claim 6, characterized in that, Following the step of "determining the maximum refrigerant concentration value within the compressor compartment," the following is also included: When the maximum refrigerant concentration value is greater than the third refrigerant concentration threshold, the inert gas emission module is controlled to emit inert gas into the compressor chamber. Wherein, the third refrigerant concentration threshold is less than the refrigerant explosion limit concentration and greater than the second refrigerant concentration threshold.

8. The explosion-proof control method for an outdoor unit according to any one of claims 5 to 7, characterized in that, Before the statement "constructing the refrigerant concentration field within the compressor compartment based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector", the following is also included: Establish an XYZ coordinate system within the compressor chamber, with the reference point as the origin. Based on the XYZ coordinate system, the position coordinates of each refrigerant concentration detector are determined.

9. An explosion-proof control device for an outdoor unit, characterized in that, include: The first determining module is used to construct a refrigerant concentration field within the compressor compartment based on the position coordinates of each refrigerant concentration detector and the actual refrigerant concentration detected by the corresponding refrigerant concentration detector. The second determining module is used to determine the maximum refrigerant concentration value in the compressor compartment based on the constructed refrigerant concentration field. The control module is used to control the exhaust module to start when the maximum refrigerant concentration value is greater than the first refrigerant concentration threshold, so as to exhaust the gas in the compressor chamber and make the first refrigerant concentration threshold less than the refrigerant explosion limit concentration.

10. An air conditioner, characterized in that, It includes the outdoor unit as described in any one of claims 1 to 4, and the explosion-proof control device as described in claim 9.

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