Ventilation mechanism for valve box and configuration method

Abstract

The invention relates to the technical field of air conditioners, in particular to a ventilation mechanism for a valve box and a configuration method, and aims to solve the problems that an existing valve box leaked refrigerant discharging mode has high requirements for the mounting position of the valve box and cannot adapt to different mounting scenes. In order to achieve the purpose, the ventilation mechanism comprises an air pipe and at least one fan, an air inlet is formed in a box body of the valve box, the air inlet end of the air pipe is communicated with the box body, and the air outlet end of the air pipe is communicated with the outdoor environment; the fan is used for discharging air in the box body to the outside through the air pipe, and the rotating speed of the fan or the fan combination can be selectively adjusted according to the length or static pressure of the air pipe. According to the ventilation mechanism, the number of the fans and the rotating speed of the fans can be determined according to the installation position of the valve box, the fans can discharge leaked refrigerants, noise generated in the operation process of the fans can be reduced, the user experience is improved, the valve box can adapt to different installation scenes, and application is wider.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular provides a ventilation mechanism for a valve box and a configuration method thereof. Background Art

[0002] With the global trend toward reducing carbon emissions, air conditioning systems are turning to new refrigerants. Combustible refrigerants, such as R32, R454B, and R290, are becoming the mainstream refrigerants in the air conditioning industry due to their high energy efficiency and low carbon emissions. However, flammable refrigerants are also flammable and explosive, posing safety challenges to air conditioning systems using them.

[0003] Existing air conditioning systems using flammable refrigerants typically incorporate a valve box. This box consists of a housing, valve, and air duct. The valve is installed on the refrigerant duct. In the event of a refrigerant leak, the valve box effectively shuts off the refrigerant, ensuring safety. The housing has an air inlet, and one end of the air duct is fixed to the housing, while the other end is connected to the building's existing exhaust fan. In the event of a refrigerant leak, the valve closes, and the exhaust fan activates to expel the refrigerant.

[0004] However, discharging the refrigerant in the box through the air duct and the building's existing exhaust fan places high demands on the installation position of the valve box and cannot adapt to different installation scenarios. For example, if the valve box is far away from the exhaust fan, the fan's air supply distance is not enough to discharge the leaked refrigerant; or if the valve box is close to the exhaust fan, the refrigerant can be discharged but the fan noise is loud, affecting the user experience.

[0005] Accordingly, the art requires a new ventilation mechanism and configuration method structure for a valve box to solve the above problems. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned technical problems, that is, to solve the problem that the existing valve box discharge method has high requirements on the installation position of the valve box and cannot adapt to different installation scenarios. For example, the valve box is far away from the exhaust fan, and the air supply distance of the fan is not enough to discharge the leaked refrigerant, or the valve box is close to the exhaust fan, and the refrigerant can be discharged but the fan noise is loud, affecting the user experience.

[0007] In a first aspect, the present invention provides a ventilation mechanism for a valve box; the ventilation mechanism includes an air duct and at least one fan, the valve box body is provided with an air inlet, the air inlet end of the air duct is connected to the box body, and the air outlet end of the air duct is connected to the outdoor environment;

[0008] The fan is used to discharge the gas in the box body to the outside through the air duct, and the speed of the fan or the fan combination can be adjusted according to the length of the air duct or the static pressure.

[0009] In a preferred technical solution of the above ventilation mechanism, an air valve is provided in the air inlet and / or on the air duct, and the air valve is used to control the opening or closing of the air inlet and / or the air duct.

[0010] In the preferred technical solution of the above ventilation mechanism, the fan is provided with a plurality of gears, each gear corresponds to a rotational speed, and the rotational speeds of the plurality of gears are different. Changing the gear of the fan can adjust the air supply distance of the fan.

[0011] In the preferred technical solution of the above ventilation mechanism, when there is one fan, the fan is arranged on the box body, inside the air duct or on the outdoor wall; or

[0012] When there are multiple fans, the multiple fans are arranged in parallel on the box body, in the air duct or on the outdoor wall; or

[0013] A plurality of the fans are arranged in series, and the plurality of fans are all arranged on the valve box, in the air duct, or on the outdoor wall; or a part of the fans are arranged on the box body, and another part of the fans are arranged in the air duct or on the outdoor wall; or

[0014] Some of the fans are arranged in parallel or in series, and the part arranged in parallel is arranged in series with another part, and the fans in the other part are arranged in series or in parallel; or

[0015] Part of the fans are arranged in parallel or in series, and the part arranged in parallel is arranged in parallel with another part, and the fans of another part are arranged in series or in parallel.

[0016] In a second aspect, the present invention provides a method for configuring a ventilation mechanism for a valve box; the ventilation mechanism includes an air duct and at least one fan, the air inlet end of the air duct is connected to the box body of the valve box, and the air outlet end of the air duct is connected to the outdoor environment;

[0017] The fan is of a type with adjustable speed or non-adjustable speed. When the fan speed is adjustable, the fan is provided with a plurality of gears, each gear corresponding to a speed;

[0018] The configuration method comprises the following steps: determining the required air supply distance or the air duct static pressure that the fan needs to support based on the length or static pressure of the box body, the length or static pressure of the air duct, and the type of the air duct;

[0019] The type, quantity or gear of the fan is determined according to the required air supply distance or the air duct static pressure that the fan needs to support.

[0020] In the preferred technical solution of the above configuration method, "determining the required air supply distance or the air duct static pressure that the fan needs to support based on the length or static pressure of the box body, the length or static pressure of the air duct, and the type of the air duct" specifically includes: required air supply distance = a * length of the valve box + length of the air duct; where a is a constant greater than 1;

[0021] The fan needs to support the air duct static pressure = box static pressure + duct static pressure;

[0022] Wherein, when the air duct is a curved pipe, the length of the air duct = the length of the straight section of the air duct + k1 * the length of the first curved section + k2 * the length of the second curved section + ...k n *The length of the nth elbow section; where k is a constant greater than 1.

[0023] In the preferred technical solution of the above configuration method, “determining the type, quantity or gear of the fan according to the required air supply distance or the air duct static pressure that the fan needs to support” specifically includes:

[0024] When there is one fan, the type or gear of the fan is determined according to the required air supply distance or the air duct static pressure that the fan needs to support;

[0025] Preferably, “when the number of the fan is one, determining the type or gear of the fan according to the required air supply distance or the air duct static pressure that the fan needs to support” includes:

[0026] Select a fan with a maximum delivery distance greater than or equal to the required air delivery distance; or

[0027] Select a fan whose maximum duct static pressure supported by the fan is greater than or equal to the duct static pressure that the fan needs to support; or

[0028] When the speed of the fan is adjustable, the speed is adjusted to a speed at which the conveying distance is greater than or equal to the required air supply distance or a speed at which the conveying distance is greater than or equal to the static pressure of the air duct.

[0029] In the preferred technical solution of the above configuration method, “determining the type, quantity or gear of the fan according to the required air supply distance or the air duct static pressure that the fan needs to support” specifically includes:

[0030] When the number of the fans is N, where N is greater than 1; determining the type of the fan according to the required air supply distance or the air duct static pressure that the fan needs to support;

[0031] Preferably, the maximum air supply distance of the fan or the maximum air duct static pressure supported by the fan is determined according to the required air supply distance or the air duct static pressure that the fan needs to support, and the number N of fans;

[0032] The type of the fan is determined according to the maximum air supply distance of the fan or the maximum air duct static pressure supported by the fan.

[0033] In the preferred technical solution of the above configuration method, “determining the type, quantity or gear of the fan according to the required air supply distance or the air duct static pressure that the fan needs to support” includes:

[0034] The type of the fan is a preset type, and the number of the fans is determined according to the required air supply distance or the air duct static pressure that the fan needs to support.

[0035] In the preferred technical solution of the above configuration method, “determining the number of the fans according to the required air supply distance or the air duct static pressure that the fans need to support” includes:

[0036] The number of fans is greater than or equal to the required air supply distance / the maximum air supply distance of the fans, and the number of fans is rounded up; or

[0037] The number of fans is greater than or equal to the air duct static pressure that the fans need to support / the maximum air duct static pressure supported by the fans, and the number of fans is rounded up.

[0038] When employing the above technical solution, the ventilation mechanism of the present invention can determine the number of fans and their speed based on the installation location of the valve box, enabling the fans to exhaust leaked refrigerant while also reducing operating noise and improving the user experience. Compared to the prior art, which utilizes the building's existing exhaust fans to exhaust gas within the box, the ventilation mechanism of the present invention allows the valve box to adapt to different installation scenarios, offering a wider range of applications.

[0039] In addition, the fan type can be either adjustable or non-adjustable in speed. The length and type of the air duct are determined based on the installation location of the valve box at the construction site and the distance from the outdoors. The type of air duct, such as straight or curved, is determined based on the length of the box body and the length of the air duct to determine the required air supply distance. The air duct static pressure can be determined based on the length and type of the air duct, and the air duct static pressure that the fan needs to support can be determined based on the static pressure of the box body and the air duct static pressure. Based on the required air supply distance or the air duct static pressure that the fan needs to support, the type, quantity, or gear of the fan can be determined, so that the fan can discharge leaked refrigerant to the outdoor environment, reduce the number of fans, or reduce the operating power of the fans to reduce costs. The type, quantity, or gear of the fan can be flexibly selected and set according to the construction site, so that the ventilation mechanism can adapt to different installation scenarios and be more widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0041] Figure 1Schematic diagram of a case where the air-conditioning system in the first embodiment of the present invention is a two-pipeline air-conditioning system;

[0042] Figure 2 1 is a schematic diagram of a case where the air-conditioning system in the first embodiment of the present invention is a two-pipeline multi-split air-conditioning system;

[0043] Figure 3 2 is a schematic diagram of a second implementation mode when the air-conditioning system in Example 1 of the present invention is a two-pipeline multi-split air-conditioning system;

[0044] Figure 4 2 is a schematic diagram of a third implementation mode when the air-conditioning system in Example 1 of the present invention is a two-pipeline multi-split air-conditioning system;

[0045] Figure 5 2 is a schematic diagram of a fourth embodiment of the present invention in which the air-conditioning system is a two-pipeline multi-split air-conditioning system;

[0046] Figure 6 Schematic diagram of a three-pipeline air-conditioning system in the first embodiment of the present invention;

[0047] Figure 7 Schematic diagram of a case where the air-conditioning system in the first embodiment of the present invention is a three-pipe multi-split air-conditioning system;

[0048] Figure 8 2 is a schematic diagram of a second implementation method when the air-conditioning system in Example 1 of the present invention is a three-pipe multi-split air-conditioning system;

[0049] Figure 9 2 is a schematic diagram of a third implementation mode when the air-conditioning system in Example 1 of the present invention is a three-pipe multi-split air-conditioning system;

[0050] Figure 10 2 is a schematic diagram of a fourth embodiment of the present invention in which the air-conditioning system is a three-pipe multi-split air-conditioning system;

[0051] Figure 11 is a schematic diagram of the valve box in the first embodiment of the present invention;

[0052] Figure 12 is a schematic diagram of a second embodiment of the valve box in Example 1 of the present invention;

[0053] Figure 13 is a schematic diagram of a third implementation of the valve box in Example 1 of the present invention;

[0054] Figure 14 1 is a schematic diagram of a fourth embodiment of the valve box in Example 1 of the present invention;

[0055] Figure 15Schematic diagram of a fifth embodiment of the valve box in Example 1 of the present invention;

[0056] Figure 16 1 is a schematic diagram of a sixth embodiment of the valve box in Example 1 of the present invention;

[0057] Figure 17 This is a roadmap of the main steps of the ventilation mechanism configuration method in the second embodiment of the present invention;

[0058] Figure 18 This is a specific step diagram of the ventilation mechanism configuration method in the second embodiment of the present invention;

[0059] Figure 19 This is a specific step diagram of the method for controlling refrigerant leakage in the valve box in the third embodiment of the present invention;

[0060] Reference numerals:

[0061] 1. Box body; 101. Air inlet; 102. Mounting hole; 21. Liquid pipe connecting pipe; 22. First shut-off valve; 31. First air pipe connecting pipe; 32. Second air pipe connecting pipe; 33. Third air pipe connecting pipe; 34. Second shut-off valve; 35. Three-way valve; 41. Air valve; 42. Air duct; 43. Fan; 5. Indoor unit; 51. Liquid pipe on the indoor unit side; 52. Air pipe on the indoor unit side; 6. Outdoor unit; 61. Liquid pipe on the outdoor unit side; 62. Air pipe on the outdoor unit side; 63. High-pressure air pipe; 64. Low-pressure air pipe; 7. Refrigerant leak detector. DETAILED DESCRIPTION

[0062] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications.

[0063] It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," and "right" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0064] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "communicated" should be understood in a broad sense. For example, they may refer to fixed or detachable connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0065] Example 1

[0066] In order to solve the problem that the existing method of discharging refrigerant due to leakage of the valve box has high requirements on the installation position of the valve box and cannot adapt to different installation scenarios.

[0067] like Figures 1 to 10 As shown, this embodiment discloses an air conditioning system. The air conditioning system can be a two-pipe air conditioning system, a two-pipe multi-split air conditioning system, a three-pipe air conditioning system, or a three-pipe multi-split air conditioning system. The air conditioning system includes an outdoor unit 6, an indoor unit 5, and at least one valve box. The valve box is installed on the liquid pipe and gas pipe between the outdoor unit 6 and the indoor unit 5 to connect or disconnect the outdoor unit 6 and the indoor unit 5.

[0068] like Figures 1 to 10 As shown, specifically, the valve box includes a box body 1, a refrigerant leakage detector 7, a ventilation mechanism, and at least one liquid pipe assembly and an air pipe assembly fixed to the box body 1. The liquid pipe assembly is connected to the liquid pipe of the air conditioning system, and the air pipe assembly is connected to the air pipe of the air conditioning system. The liquid pipe assembly and the air pipe assembly can connect the outdoor unit 6 and each indoor unit 5 to allow refrigerant to circulate. When a refrigerant leak occurs in the air conditioning system, the refrigerant circulation can be cut off to stop the air conditioning system from leaking refrigerant. Since the liquid pipe assembly and the air pipe assembly are fixed to the box body 1, when the valve box is installed in the air conditioning system, the air pipe assembly and the liquid pipe assembly can be connected to the air pipe and liquid pipe of the air conditioning system. Compared with first installing the valve on the liquid pipe and the air pipe and then fixing the valve box, the installation process is more convenient, thereby improving the installation efficiency of the entire air conditioning system.

[0069] A refrigerant leak detector 7 is installed within the housing 1 and is in communication with the air conditioning system's control system. It detects the refrigerant concentration and rate of change within the housing 1 and transmits this information to the control system in real time. If a refrigerant leak is detected within the housing 1, the control system controls the liquid and gas pipe assemblies to cut off the refrigerant circulation and activates the ventilation mechanism to exhaust the leaked refrigerant to the outside environment, thereby promptly reducing the refrigerant concentration within the housing 1. This reduces the possibility of combustion or explosion in the valve box due to excessive refrigerant concentration, thereby improving the safety of the entire air conditioning system.

[0070] like Figures 1 to 10As shown, the liquid pipe assembly includes a liquid pipe connecting pipe 21 and a first shut-off valve 22 installed on the liquid pipe connecting pipe 21. The liquid pipe connecting pipe 21 is arranged through the box body 1 and fixed on the box body 1, and both ends of the liquid pipe connecting pipe 21 are connected to the liquid pipe, so that the outdoor unit 6 and the indoor unit 5 are connected. By opening or closing the first shut-off valve 22, whether the refrigerant can flow through the liquid pipe connecting pipe 21 can be controlled.

[0071] The air pipe assembly includes a valve component and a first air pipe connecting pipe 31 disposed through the housing 1. The first air pipe connecting pipe 31 connects the air pipe on the outdoor unit side and the air pipe on the indoor unit side. The valve component includes a second shutoff valve 34, which is mounted on the first air pipe connecting pipe 31 and is used to control the opening and closing of the first air pipe connecting pipe 31. Alternatively, the air pipe assembly includes two second air pipe connecting pipes 32, a valve component, and a third air pipe connecting pipe 33. The first ends of the two second air pipe connecting pipes 32 are respectively connected to the high-pressure air pipe 63 and the low-pressure air pipe 64 on the outdoor unit side, and the second ends are both connected to the first end of the third air pipe connecting pipe 33. The second end of the third air pipe connecting pipe 33 is connected to the air pipe on the indoor unit side. The valve component is used to control the selection of one of the second air pipe connecting pipes 32 to connect to the third air pipe connecting pipe, and to cut off the connection between the second air pipe connecting pipe 32 and the third air pipe connecting pipe 33.

[0072] By flexibly adjusting the number of liquid and gas pipe assemblies within the valve box, as well as the specific configuration of the gas pipe assemblies, the valve box can be adapted to various air conditioning systems, such as two-pipe systems, two-pipe multi-split systems, three-pipe systems, and three-pipe multi-split systems, broadening its applicability. Furthermore, the number and installation locations of the valve boxes can be flexibly adjusted based on actual system requirements, enabling the valve box to more effectively cut off the refrigerant in the air conditioning system.

[0073] Alternatively, the air pipe assembly includes a valve component and two second air pipe connecting pipes 32, the second air pipe connecting pipes 32 being disposed through the box body 1. The valve component includes two second shut-off valves 34, both of which are mounted on the second air pipe connecting pipes 32. This type of valve box can be used when a three-pipe air conditioner or a three-pipe multi-split air conditioner using non-flammable refrigerant needs to be converted to one using flammable refrigerant. The first ends of the two second air pipe connecting pipes 32 are respectively connected to the high-pressure air pipe 63 and the low-pressure air pipe 64 on the outdoor unit side, and the second ends are respectively connected to the high-pressure air pipe 63 and the low-pressure air pipe 64 on the indoor unit side.

[0074] like Figures 1 to 5As shown, when the valve box is suitable for a two-pipe air conditioning system or a two-pipe multi-split air conditioning system, the air pipe assembly includes a valve component and a first air pipe connecting pipe 31. The valve component includes a second shutoff valve 34. The second shutoff valve 34 is mounted on the first air pipe connecting pipe 31. The first air pipe connecting pipe 31 connects the air pipe on the outdoor unit side and the air pipe on the indoor unit side. By opening or closing the second shutoff valve 34, the flow of refrigerant through the first air pipe connecting pipe 31 can be controlled.

[0075] like Figures 6 to 10 As shown, when the valve box is suitable for a three-pipe air conditioning system or a three-pipe multi-split air conditioning system, the air pipe assembly includes two second air pipe connecting pipes 32, a valve component, and a third air pipe connecting pipe 33. The first ends of the two second air pipe connecting pipes 32 are respectively connected to the high-pressure air pipe 63 and the low-pressure air pipe 64 on the outdoor unit side, and the second ends are both connected to the first end of the third air pipe connecting pipe 33. The second end of the third air pipe connecting pipe 33 is connected to the air pipe on the indoor unit side. The valve component includes two second shut-off valves 34, which are installed one-to-one on the second air pipe connecting pipes 32 to control the flow of air between the second air pipe connecting pipes 32 and the third air pipe connecting pipe 33.

[0076] When the three-pipe multi-split air conditioning system is in operation, one of the second shutoff valves 34 is opened to connect the corresponding second air pipe connecting pipe 32 with the third air pipe connecting pipe 33. The other second shutoff valve 34 is closed to disconnect the corresponding second air pipe connecting pipe 32 and the third air pipe connecting pipe 33, allowing the indoor unit 5 to operate in cooling or heating mode. If a leak occurs in the box body 1, the first shutoff valve 22 and the two second shutoff valves 34 are closed to stop the refrigerant leakage from the valve box, and the ventilation mechanism is activated to discharge the leaked refrigerant.

[0077] Regarding the valve member, it should be noted that although the valve member includes two second shut-off valves 34 in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, such as Figure 12 As shown, the valve component includes a three-way valve 35, two second air pipe connecting pipes 32 are respectively connected to the first and second interfaces of the three-way valve 35, and the third air pipe connecting pipe 33 is connected to the third interface of the three-way valve 35. When the three-pipe multi-connection air conditioning system is in operation, the first interface or the second interface of the three-way valve 35 is controlled to communicate with the third interface, so that only one of the second air pipe connecting pipes 32 is connected to the third air pipe connecting pipe 33, allowing the indoor unit 5 to perform cooling or heating. When a leak occurs in the box body 1, the first shut-off valve 22 is closed, and the first and second interfaces of the three-way valve 35 are controlled to be disconnected from the third interface, thereby cutting off the second and third air pipe connecting pipes 32 and 33, and the ventilation mechanism is activated to discharge the leaked refrigerant.

[0078] like Figures 11 to 17As shown, the ventilation mechanism includes a damper 41, an air duct 42, and at least one fan 43. An air inlet 101 is provided on one side of the housing 1, and a mounting hole 102 is provided on the other side of the housing 1. The damper 41 is mounted within the air inlet 101, the air inlet end of the air duct 42 is fixed within the mounting hole 102, and the air outlet end of the air duct 42 extends to the outdoor environment. Of course, the damper 41 can also be mounted within the air duct 42. Both the damper 41 and the fan 43 are communicatively connected to a control system. When a refrigerant leak is detected within the housing 1, the control system controls the damper 41 to open and activates the fan 43. Air outside the housing 1 enters the housing 1 through the damper 41 and, under the action of the fan 43, carries the refrigerant within the housing 1 through the air duct 42 to the outdoor environment. On the one hand, this can reduce the refrigerant concentration within the housing 1, reducing the possibility of combustion or explosion of the valve box due to excessive refrigerant concentration. On the other hand, the leaked refrigerant is directly discharged to the outdoor environment through the air duct 42, which can reduce the possibility of harm to people indoors caused by the refrigerant.

[0079] The fan 43 can have a fixed speed, or can adjust its speed according to the required air supply distance, or can adjust its speed according to the static pressure of the air duct. The speed of the fan 43 can be changed to adjust the air supply distance of the fan 43 and the static pressure of the air duct supported by the fan 43. When the speed of the fan 43 is adjustable, the fan 43 is provided with multiple gears, each gear corresponding to a speed, and the speeds of the multiple gears are different, each gear corresponding to an air supply distance range of the fan 43 or an air duct static pressure range supported by the fan 43. According to the measured length of the box body 1 and the length of the air duct 42, or the static pressure of the box body and the static pressure of the air duct, the fan 43 is adjusted to the corresponding gear, so that the fan 43 can discharge the leaked refrigerant to the outside and reduce the operating noise.

[0080] The required air supply distance is determined based on the length of the box body 1 and the length and type of the air duct 42, which can be straight or curved. Required air supply distance = a * length of the box body 1 + length of the air duct 42, where a is a constant greater than 1 to compensate for the resistance of the structure within the box body 1. When the air duct 42 is a straight pipe, the length of the air duct 42 is the actual measured length of the straight pipe. When the air duct 42 is a curved pipe, the length of the air duct 42 = the length of the straight section of the air duct 42 + k1 * length of the first curved section + k2 * length of the second curved section + ...k n * The length of the nth curved pipe section; k is greater than 1, specifically determined through actual experiments or simulation experiments; the smaller the turning radius of the curved pipe section, the larger k. The type and number of fans 43 are determined based on the required air supply distance.

[0081] like Figure 11As shown, specifically, when the number of fans 43 is one, select the fan 43 with the maximum delivery distance ≥ the required air supply distance. When the speed of the fan 43 is not adjustable, start the fan 43 and run it at a fixed speed to discharge the refrigerant to the outside. When the speed of the fan 43 is adjustable, the fan 43 is provided with a plurality of gears, each gear corresponding to a speed, and each gear corresponding to a range of required air supply distances. After manually determining the length of the pipeline and the required air supply distance according to the installation position of the valve box, adjust the fan 43 to the corresponding gear by dialing the code, so that after the fan 43 is started, the leaked refrigerant can be discharged to the outside and the operating noise can be reduced. The fan 43 can be an axial fan 43 or a centrifugal fan 43, and can be installed in the air inlet 101, in the mounting hole 102, in the air duct 42 or on the outdoor wall. The specific user or designer can make the choice at his own discretion.

[0082] When there are multiple fans 43, such as N, and the sum of the air supply distances of the multiple fans 43 is ≥ the required air supply distance, providing multiple fans 43 can increase the air supply distance of the ventilation mechanism to transport the refrigerant in the box body 1 to the outdoors. When the speed of the fans 43 is not adjustable, start each fan 43 to run at a fixed speed to discharge the refrigerant to the outdoors. When the speed of the fans 43 is adjustable, the gear position of each fan 43 can be flexibly adjusted so that the sum of the air supply distances of each fan 43 is ≥ the required air supply distance. The fans 43 can all be axial flow fans 43 or centrifugal fans 43, or some can be centrifugal fans 43 and the other part can be axial flow fans 43.

[0083] like Figure 12 As shown, multiple fans 43 are arranged in series, and multiple fans 43 are installed in the air inlet 101, the mounting hole 102, the air duct 42 or on the outdoor wall; or some fans 43 are installed at any position among the air inlet 101, the mounting hole 102, the air duct 42 or the outdoor wall, and the other part of the fans 43 are installed in the air inlet 101, the mounting hole 102, the air duct 42 and / or the outdoor wall.

[0084] like Figure 13 As shown, multiple fans 43 can be arranged in parallel in the air inlet 101, the mounting hole 102, the air duct 42 or on the outdoor wall.

[0085] like Figure 14 As shown, a part of the fans 43 can also be installed in parallel in the air inlet 101, the mounting hole 102, the air duct 42 or at any position on the outdoor wall, and another part of the fans 43 can be installed in parallel in the air inlet 101, the mounting hole 102, the air duct 42 and / or the outdoor wall.

[0086] like Figure 15As shown, some of the fans 43 can be set in parallel, and the parallel-set part can be set in series with another part, and another part of the fans 43 can be set in series or in parallel; some of the fans 43 can be set in series, and the series-set part can be set in series with another part, and another part of the fans 43 can be set in series or in parallel.

[0087] like Figure 16 As shown, some fans 43 may be arranged in parallel, with the parallel-arranged portion arranged in parallel with another portion, while another portion of fans 43 is arranged in series or in parallel. Alternatively, some fans 43 may be arranged in series, with the series-arranged portion arranged in parallel with another portion, while another portion of fans 43 is arranged in series or in parallel. Designers can flexibly arrange the installation positions of fans 43 according to actual needs, making the valve box suitable for different installation scenarios.

[0088] Preferably, when there are multiple fans 43, the speed of each fan 43 is not adjustable. Multiple fans 43 are all axial flow fans 43, and the fans 43 are connected in series, and each fan 43 is installed in the air inlet 101, or some fans 43 are installed in the air inlet 101, and the other fans 43 are installed in the air duct 42. The fans 43 in the air duct 42 can continue to discharge the refrigerant transmitted by the fans 43 in the air inlet 101 to the outside. Multiple fans 43 are all axial flow fans 43, and the fans 43 are connected in parallel, and each fan 43 is installed in the mounting hole 102. Multiple fans 43 are all centrifugal fans 43, and are arranged in parallel, and the fans 43 are installed in the mounting hole 102. These preferred installation methods are more convenient for the fan 43 to install, and the refrigerant can be better discharged to the outside.

[0089] The number of fans 43 or the number and gear of fans 43 can also be determined based on the type of fan 43. When the speed of fan 43 is not adjustable and the air supply distance of fan 43 is determined, the number of fans 43 ≥ the required air supply distance / the air supply distance of fan 43, and the number of fans is rounded up to an integer. When the speed of fan 43 is adjustable and the maximum air supply distance of fan 43 is determined, the number of fans 43 ≥ the required air supply distance / the maximum air supply distance of fan 43, and the number of fans is rounded up to an integer. The gear of each fan 43 can be flexibly adjusted to ensure that the fan 43 meets the relationship while reducing operating noise.

[0090] In parallel, the duct static pressure can also be determined based on the length and type of duct 42. Based on the duct static pressure and the box static pressure, the required duct static pressure for fan 43 can be determined. Duct static pressure is the pressure of the fluid in duct 42 when it is not flowing, and is primarily related to the resistance, diameter, and curvature of duct 42. Box static pressure is the pressure of the fluid in box body 1 when it is not flowing, and is primarily related to the resistance, inner diameter, and internal structure of box body 1. The methods for measuring box static pressure and duct static pressure are conventional, and the specific methods will not be repeated here.

[0091] The duct static pressure that fan 43 needs to support = box static pressure + duct static pressure. The type and quantity of fan 43 are determined based on the duct static pressure that fan 43 needs to support. Specifically, when there is only one fan 43, select the duct static pressure supported by fan 43 ≥ the duct static pressure that fan 43 needs to support. When the speed of fan 43 is not adjustable, start fan 43 and run it at a fixed speed. When the speed of fan 43 is adjustable, fan 43 is provided with multiple gears, each gear corresponding to a speed, and each gear corresponding to a range of duct static pressure that fan 43 needs to support. After manually determining the duct static pressure that fan 43 needs to support, adjust fan 43 to the corresponding gear by dialing the code, so that after starting fan 43, it can discharge the leaked refrigerant to the outside and reduce the operating noise.

[0092] When there are multiple fans 43, such as N fans, the sum of the static pressures in the air duct supported by the multiple fans 43 is greater than or equal to the static pressure in the air duct that the fans 43 need to support. Providing multiple fans 43 can increase the wind speed in the air duct 42 and increase the static pressure in the air duct supported by the fans 43, so as to transport the refrigerant in the box body 1 to the outdoors. When the speed of the fans 43 is not adjustable, each fan 43 is started to run at a fixed speed to discharge the refrigerant to the outdoors. When the speed of the fans 43 is adjustable, the gear position of each fan 43 can be flexibly adjusted so that the sum of the static pressures in the air duct supported by each fan is greater than or equal to the static pressure in the air duct that the fans need to support.

[0093] According to the duct static pressure that the fan 43 needs to support, the type of the fan 43 is determined, and according to the type of the fan 43, the number of the fans 43 is determined. When the type of the fan 43 is a non-adjustable speed, and the duct static pressure supported by the fan 43 is determined, the number of fans ≥ the duct static pressure that the fan needs to support / the duct static pressure supported by the fan, and the number of fans 43 is rounded up to an integer value. When the type of the fan 43 is an adjustable speed, and the maximum duct static pressure supported by the fan 43 is determined, the number of fans ≥ the duct static pressure that the fan needs to support / the maximum duct static pressure supported by the fan, and the number of fans is rounded up to an integer value. The gears of each fan 43 can be flexibly adjusted so that the fan 43 meets the relationship while reducing the operating noise. The installation position of the fan 43 is the same as when the number and type of the fan 43 are determined according to the required air supply distance, and the details will not be repeated.

[0094] The valve box can be configured according to the installation position of the valve box at the construction site, and the type and number of fans 43 can be flexibly selected and set according to the construction site, so that the ventilation mechanism can adapt to different installation scenarios and be more widely used.

[0095] Furthermore, the valve box also includes an audible and visual alarm device, which is communicated with the control system. When refrigerant leakage occurs in the box body 1, the audible and visual alarm device sounds an alarm to remind indoor personnel to leave the room as soon as possible and contact maintenance personnel to inspect the valve box.

[0096] like Figure 1 As shown, when the air conditioning system is a two-pipe system, a liquid pipe and a gas pipe connect the outdoor unit 6 and the indoor unit 5. A valve box is installed on the liquid pipe and the gas pipe. In this case, the valve box contains one liquid pipe assembly and one gas pipe assembly. The gas pipe assembly includes a valve component and a first gas pipe connecting pipe 31. The valve component includes a second shutoff valve 34. The liquid pipe connecting pipe 21 has one end connected to the liquid pipe on the outdoor unit side and the other end connected to the liquid pipe on the indoor unit side. The first gas pipe connecting pipe 31 has one end connected to the gas pipe on the outdoor unit side and the other end connected to the gas pipe on the indoor unit side. Opening the first shutoff valve 22 and the second shutoff valve 34 enables communication between the outdoor unit 6 and the indoor unit 5, allowing the indoor unit 5 to cool or heat. In the event of a refrigerant leak, the first shutoff valve 22 and the second shutoff valve 34 are closed to stop the refrigerant leakage, and the ventilation mechanism is activated to reduce the refrigerant concentration within the housing 1.

[0097] like Figures 2 to 5 As shown, when the air conditioning system is a two-pipe multi-split air conditioning system, at least one valve box is installed on the outdoor unit's liquid pipe and the outdoor unit's gas pipe, and / or the indoor unit's liquid pipe and the indoor unit's gas pipe. The outdoor unit's liquid pipe and gas pipe are connected to the indoor unit 5 via the at least one valve box. In this case, the gas pipe assembly includes a valve component and a first gas pipe connecting pipe 31, and the valve component includes a second shutoff valve 34. Opening the first shutoff valve 22 and the second shutoff valve 34 enables communication between the outdoor unit 6 and the indoor unit 5, allowing the indoor unit 5 to cool or heat. In the event of refrigerant leakage, the first shutoff valve 22 and the second shutoff valve 34 are closed to stop the refrigerant leakage, and the ventilation mechanism is activated to reduce the refrigerant concentration within the housing 1.

[0098] like Figure 2 As shown, specifically, a valve box is installed on the liquid pipe on the outdoor unit side and the gas pipe on the outdoor unit side. The number of liquid pipe assemblies and gas pipe assemblies in the valve box is set to one. Both ends of the liquid pipe connecting pipe 21 are connected to the liquid pipe on the outdoor unit side, and both ends of the first gas pipe connecting pipe 31 are connected to the gas pipe on the outdoor unit side. Opening the first shut-off valve 22 and the second shut-off valve 34 allows refrigerant to circulate between the outdoor unit 6 and each indoor unit 5, controlling the operation of all indoor units 5. In this type of dual-pipe multi-split air conditioning system, there is only one valve box, and the number of liquid pipe assemblies and gas pipe assemblies are set to one, which can save costs, shorten installation time, and reduce the indoor space occupied.

[0099] If a refrigerant leak occurs in one of the indoor units 5, the first shutoff valve 22 and the second shutoff valve 34 are closed to stop the refrigerant from leaking, thereby reducing the possibility of combustion or explosion in the room.

[0100] If leakage occurs in the box body 1, close the first shut-off valve 22 and the second shut-off valve 34 to stop the refrigerant leakage, and at the same time start the ventilation mechanism to discharge the refrigerant in the box body 1 to the outside, so as to timely reduce the refrigerant concentration in the box body 1 and reduce the possibility of combustion or explosion of the valve box.

[0101] like Figure 3 As shown, multiple valve boxes can be installed on the liquid pipe and gas pipe on the outdoor unit side. The valve boxes are spaced apart, so that the refrigerant in the outdoor unit 6 flows through at least one valve box and then into the indoor unit 5 before returning. The number of liquid pipe assemblies and gas pipe assemblies in the valve box is set to one. Both ends of the liquid pipe connecting pipe 21 are connected to the liquid pipe on the outdoor unit side, and both ends of the first gas pipe connecting pipe 31 are connected to the gas pipe on the outdoor unit side. Opening the first shut-off valve 22 and the second shut-off valve 34 of all valve boxes allows the refrigerant to circulate between the outdoor unit 6 and each indoor unit 5, controlling the operation of all indoor units 5. If a leak occurs in a box body 1, closing the first shut-off valve 22 and the second shut-off valve 34 in the corresponding valve box can stop the refrigerant leakage. At the same time, the ventilation mechanism is activated to discharge the refrigerant in the box body 1 to the outside, reducing the possibility of combustion or explosion in the valve box.

[0102] In this type of dual-pipe multi-split air-conditioning system, each valve box can cut off the refrigerant flow path, with the side of the valve box close to the outdoor unit 6 as the upstream of the refrigerant flow path. When a leak occurs in a certain indoor unit 5, the valve box closest to the indoor unit 5 upstream of the indoor unit 5 is controlled to cut off the refrigerant flow path, so that the leaking indoor unit 5 will no longer leak, and at the same time, the number of indoor units 5 that are out of service can be minimized, reducing the impact on users.

[0103] like Figure 4 As shown, valve boxes are provided on the liquid pipe and gas pipe on the indoor unit side, and the number of valve boxes is set to one. In this case, the number of liquid pipe assemblies and gas pipe assemblies is set to multiple, and they are arranged in a one-to-one correspondence with the indoor units 5. The first ends of each liquid pipe connecting pipe 21 merge and connect to the liquid pipe on the outdoor unit side, and the second ends of the liquid pipe connecting pipe 21 connect to the liquid pipe on the corresponding indoor unit side. The first ends of each first gas pipe connecting pipe 31 merge and connect to the gas pipe on the outdoor side, and the second ends connect to the gas pipe on the corresponding indoor unit side. By opening or closing the corresponding first shutoff valve 22 and second shutoff valve 34, refrigerant can circulate between the outdoor unit 6 and the corresponding indoor unit 5, controlling the operation of the corresponding indoor unit 5.

[0104] If a leak occurs within the housing 1, closing all first and second shutoff valves 22 and 34 will stop the refrigerant from leaking. Simultaneously, the ventilation mechanism will be activated to discharge the refrigerant within the housing 1 to the outside, reducing the possibility of combustion or explosion within the valve housing. If a leak occurs within a particular indoor unit 5, closing the corresponding first and second shutoff valves 22 and 34 will prevent further refrigerant leakage from that unit. This type of two-pipeline multi-split air conditioning system allows the leaking indoor unit 5 to be isolated using the corresponding first and second shutoff valves 22 and 34, without affecting the normal operation of other indoor units 5 and minimizing the impact on users.

[0105] like Figure 5 As shown, each indoor unit 5 corresponds to a valve box, which is installed on the liquid pipe and gas pipe on the indoor unit side. In this case, the number of liquid pipe assemblies and gas pipe assemblies is set to one. Both ends of the liquid pipe connecting pipe 21 are connected to the liquid pipe on the indoor unit side, and both ends of the first gas pipe connecting pipe 31 are connected to the gas pipe on the indoor unit side. Opening or closing the first shutoff valve 22 and second shutoff valve 34 of a valve box allows refrigerant to circulate between the outdoor unit 6 and the corresponding indoor unit 5, controlling the operation of the corresponding indoor unit 5.

[0106] If a leak occurs in a certain indoor unit 5, the first shut-off valve 22 and the second shut-off valve 34 in the corresponding valve box are closed to prevent the indoor unit 5 from leaking refrigerant. If a leak occurs in a certain valve box, the first shut-off valve 22 and the second shut-off valve 34 in the valve box are closed to stop the refrigerant from leaking. At the same time, the ventilation mechanism is activated to discharge the refrigerant in the box body 1 to the outside to reduce the possibility of combustion or explosion of the valve box. This type of two-pipeline multi-split air conditioning system can individually shut off the leaking indoor unit 5 through the corresponding valve box. When a leak occurs in the valve box, only the first shut-off valve 22 and the second shut-off valve 34 in the leaking valve box need to be closed to shut down the indoor unit 5 corresponding to the leaking valve box. This will not affect the normal operation of other indoor units 5, thus reducing the impact on users.

[0107] like Figure 6 As shown, when the air conditioning system is a three-pipe system, the outdoor unit's liquid pipe, the outdoor unit's high-pressure gas pipe 63, and the outdoor unit's low-pressure gas pipe 64 are connected to the indoor unit's liquid pipe and gas pipe via a valve box. In this case, there is one liquid pipe assembly and one gas pipe assembly. The gas pipe assembly includes two second gas pipe connecting pipes 32, a valve component, and a third gas pipe connecting pipe 33. The valve component includes two second shutoff valves 34, or the valve component includes a three-way valve 35. In this embodiment, the valve component includes two second shutoff valves 34 as an example. One end of the liquid pipe connecting pipe 21 is connected to the outdoor unit's liquid pipe, and the other end is connected to the indoor unit's liquid pipe. The two second gas pipe connecting pipes 32 are connected to the outdoor unit's high-pressure gas pipe 63 and low-pressure gas pipe 64, respectively. The third gas pipe connecting pipe 33 is connected to the indoor unit's gas pipe.

[0108] When the three-pipe air-conditioning system is in operation, the first shut-off valve 22 is opened, and one of the second shut-off valves 34 is opened to connect the corresponding second air pipe connecting pipe 32 with the third air pipe connecting pipe 33. At the same time, the other second shut-off valve 34 is closed to cut off the corresponding second air pipe connecting pipe 32 with the third air pipe connecting pipe 33, so that each indoor unit 5 can be connected with the outdoor unit 6 to cool or heat the room.

[0109] When refrigerant leakage occurs in the box body 1, the first shutoff valve 22 and the two second shutoff valves 34 are closed to prevent further leakage of the refrigerant, and the ventilation mechanism is activated to discharge the refrigerant in the box body 1 to the outside, reducing the refrigerant concentration in the box body 1 and thereby lowering the possibility of combustion or explosion of the box body 1. When refrigerant leakage occurs in the indoor unit 5, the first shutoff valve 22 and the two second shutoff valves 34 are closed to cut off the flow of refrigerant between the outdoor unit 6 and the indoor unit 5, preventing further leakage in the leaking indoor unit 5.

[0110] like Figures 7 to 10 As shown, when the air conditioning system is a three-pipe multi-split air conditioning system, valve boxes are installed on the outdoor unit's liquid pipe, the outdoor unit's high-pressure gas pipe 63, and the low-pressure gas pipe 64; or valve boxes are installed on the indoor unit's liquid pipe and the indoor unit's gas pipe. The indoor unit's liquid pipe communicates with the outdoor unit's liquid pipe via the valve box, and the indoor unit's gas pipe communicates with the outdoor unit's high-pressure gas pipe 63 and the low-pressure gas pipe 64 via the valve box. The gas pipe assembly includes two second gas pipe connecting pipes 32, a valve member, and a third gas pipe connecting pipe 33. The valve member includes two second shutoff valves 34, or the valve member includes a three-way valve 35. In this embodiment, the valve member includes two second shutoff valves 34 as an example.

[0111] like Figure 7 As shown, specifically, a valve box is installed on the outdoor unit's liquid pipe, the outdoor unit's high-pressure gas pipe 63, and the outdoor unit's low-pressure gas pipe 64. In this case, the number of liquid pipe assemblies and gas pipe assemblies is set to one. The first end of the liquid pipe connecting pipe 21 is connected to the outdoor unit's liquid pipe, and the second end is connected to the indoor unit's liquid pipe. The first end of one second gas pipe connecting pipe 32 is connected to the outdoor unit's high-pressure gas pipe 63, and the first end of the other second gas pipe connecting pipe 32 is connected to the outdoor unit's low-pressure gas pipe 64. The second ends of the two second gas pipe connecting pipes 32 are both connected to the first end of the third gas pipe connecting pipe 33. The second end of the third gas pipe connecting pipe 33 extends out of the box body 1 and is connected to the indoor unit's gas pipe.

[0112] When the three-pipe multi-split air-conditioning system is in operation, the first shut-off valve 22 is opened, and one of the second shut-off valves 34 is opened to connect the corresponding second air pipe connecting pipe 32 with the third air pipe connecting pipe 33. At the same time, the other second shut-off valve 34 is closed to cut off the corresponding second air pipe connecting pipe 32 with the third air pipe connecting pipe 33, so that each indoor unit 5 can be connected with the outdoor unit 6 to cool or heat the room.

[0113] When a refrigerant leak occurs in the box body 1, the first shutoff valve 22 and the two second shutoff valves 34 are closed to prevent further leakage of the refrigerant, and the ventilation mechanism is activated to discharge the refrigerant in the box body 1 to the outside, reducing the refrigerant concentration in the box body 1 and thereby lowering the possibility of combustion or explosion of the box body 1. When a refrigerant leak occurs in a certain indoor unit 5, the first shutoff valve 22 and the two second shutoff valves 34 are closed to cut off the flow of refrigerant between the outdoor unit 6 and the indoor unit 5, preventing further leakage in the leaking indoor unit 5. In this type of three-pipe multi-connected air conditioning system, there is only one valve box, and only one air pipe assembly and one liquid pipe assembly, which can reduce the manufacturing cost of the entire system and facilitate installation.

[0114] like Figure 8 As shown, further, on the basis of a valve box installed on the liquid pipe on the outdoor unit side, the high-pressure gas pipe 63 and the low-pressure gas pipe 64 on the outdoor unit side, a two-valve valve box is also installed on the liquid pipe on the indoor unit side and the gas pipe on the indoor unit side corresponding to each indoor unit 5. The two-valve valve box is a valve box suitable for a two-pipe air-conditioning system and a two-pipe multi-split air-conditioning system.

[0115] The two-valve box has one gas pipe assembly and one liquid pipe assembly. Both ends of the liquid pipe connecting pipe 21 of the liquid pipe assembly are connected to the liquid pipe on the indoor unit side, and both ends of the first gas pipe connecting pipe 31 of the gas pipe assembly are connected to the gas pipe on the indoor unit side. When the three-pipe multi-split air conditioning system is in operation, the first shutoff valve 22 and the second shutoff valve 34 of the two-valve box are in the open state, allowing refrigerant passing through the valve box installed on the liquid pipe on the outdoor unit side, the high-pressure gas pipe 63, or the low-pressure gas pipe 64 on the outdoor unit side to flow into or out of the indoor unit 5.

[0116] By adding two-valve valve boxes to the liquid pipe and gas pipe on the indoor unit side, when a leak occurs in a certain indoor unit 5, the first shutoff valve 22 and the second shutoff valve 34 in the corresponding two-valve valve box are closed to shut off the leaking indoor unit 5. This prevents further refrigerant leakage from the indoor unit 5 without affecting the normal operation of other indoor units 5, thereby reducing the impact on users. When a refrigerant leak occurs in a two-valve valve box, only the first shutoff valve 22 and the second shutoff valve 34 in the corresponding two-valve valve box need to be closed and the ventilation mechanism of the two-valve valve box opened to promptly discharge the leaked refrigerant, which also does not affect the normal operation of other indoor units 5.

[0117] like Figure 9 As shown, valve boxes are installed on the liquid pipe and gas pipe on the indoor unit side, and the number of valve boxes is set to one. In this case, the number of liquid pipe assemblies and gas pipe assemblies is set to multiple, and they are arranged one-to-one with the indoor units 5. The first ends of each liquid pipe connecting pipe 21 are connected to the liquid pipe on the outdoor unit side after merging, and the second ends of the liquid pipe connecting pipe 21 are connected to the liquid pipe on the corresponding indoor unit side. The first ends of one second gas pipe connecting pipe 32 of each gas pipe assembly are connected to the high-pressure gas pipe 63 on the outdoor unit side after merging, and the first ends of another second gas pipe connecting pipe 32 of each gas pipe assembly are connected to the low-pressure gas pipe 64 on the outdoor unit side after merging. The second ends of the third gas pipe connecting pipe 33 of each gas pipe assembly are connected to the gas pipe on the corresponding indoor unit side.

[0118] Open the first shut-off valve 22, open one of the second shut-off valves 34 of the corresponding air pipe assembly, so that the corresponding second air pipe connecting pipe 32 is connected to the third air pipe connecting pipe 33, and at the same time close the other second shut-off valve 34, cut off the corresponding second air pipe connecting pipe 32 and the third air pipe connecting pipe 33, so that the outdoor unit 6 can be connected to the corresponding indoor unit 5, so that each indoor unit 5 can perform cooling or heating independently to meet the needs of users in different rooms.

[0119] When a refrigerant leak occurs in the valve box, all first shutoff valves 22 and second shutoff valves 34 in the box body 1 are closed to stop the refrigerant leakage, and the ventilation mechanism is activated to discharge the refrigerant in the box body 1 to the outside, thereby reducing the possibility of combustion or explosion of the refrigerant valve box. When a leak occurs in a particular indoor unit 5, the corresponding first shutoff valve 22 and two second shutoff valves 34 are closed to prevent refrigerant leakage from the indoor unit 5. This type of three-pipe multi-split air conditioning system can isolate the leaking indoor unit 5 without affecting the normal operation of other indoor units 5, thus reducing the impact on users.

[0120] like Figure 10 As shown, each indoor unit 5 corresponds to a valve box, which is installed on the liquid pipe and gas pipe on the indoor unit side. In this case, the number of liquid pipe assemblies and gas pipe assemblies is set to one. The first end of the liquid pipe connecting pipe 21 is connected to the liquid pipe on the outdoor unit side, and the second end is connected to the liquid pipe on the corresponding indoor unit side. The first end of one second gas pipe connecting pipe 32 is connected to the high-pressure gas pipe 63 on the outdoor unit side, the first end of another second gas pipe connecting pipe 32 is connected to the low-pressure gas pipe 64 on the outdoor unit side, and the second end of the third gas pipe connecting pipe 33 is connected to the gas pipe on the corresponding indoor unit side.

[0121] Open the first shut-off valve 22 of the corresponding valve box, open one of the second shut-off valves 34 of the corresponding valve box, so that the corresponding second air pipe connecting pipe 32 is connected to the third air pipe connecting pipe 33, and at the same time close the other second shut-off valve 34 to cut off the corresponding second air pipe connecting pipe 32 and the third air pipe connecting pipe 33, so that the outdoor unit 6 can be connected to the corresponding indoor unit 5, so that each indoor unit 5 can perform cooling or heating independently to meet the needs of users in different rooms.

[0122] When a leak occurs in a particular indoor unit 5, the first shutoff valve 22 and two second shutoff valves 34 of the corresponding valve box are closed, preventing further refrigerant leakage from the indoor unit 5. When a refrigerant leak occurs in a particular valve box, the first shutoff valve 22 and two second shutoff valves 34 of the corresponding valve box are closed to stop the refrigerant leakage, and the ventilation mechanism is activated to discharge the refrigerant in the box body 1 to the outside, reducing the possibility of the valve box exploding. This type of three-pipe multi-split air conditioning system can isolate the leaking indoor unit 5 and valve box individually without affecting the normal operation of other valve boxes and indoor units 5, thus minimizing the impact on users.

[0123] By flexibly adjusting the number of valve boxes, their installation locations, the number of gas and liquid pipe assemblies, and the specific configuration of the gas pipe assemblies, the valve box can be adapted to various air conditioning systems, providing a wider range of applicability. Furthermore, compared to first installing the valves on the liquid and gas pipes and then securing the valve box, the installation process is more convenient, thereby improving the overall installation efficiency of the air conditioning system.

[0124] Example 2

[0125] This embodiment discloses a configuration method of a ventilation mechanism, and the ventilation mechanism is the ventilation mechanism in the first embodiment.

[0126] like Figure 17 As shown, the configuration method of the ventilation mechanism mainly includes the following steps:

[0127] Determine the required air supply distance or the air duct static pressure that the fan 43 needs to support based on the length or static pressure of the box body 1, the length or static pressure of the air duct 42, and the type of the air duct 42;

[0128] The type, quantity or gear of the fan 43 is determined according to the required air supply distance or the air duct static pressure that the fan 43 needs to support.

[0129] The valve box is configured according to the installation position of the valve box at the construction site, and the type, quantity and gear position of the fan 43 can be flexibly selected and set according to the construction site, so that the ventilation mechanism can adapt to different installation scenarios and be more widely used.

[0130] like Figure 18 As shown, the configuration method of the ventilation mechanism specifically includes the following steps:

[0131] S1. Determine the type, quantity, or gear of the fan 43 based on the required air supply distance or the air duct static pressure that the fan 43 needs to support.

[0132] S2. When the required air supply distance is used as a condition, the length and type of the air duct 42 are determined based on the distance between the installation location of the valve box at the construction site and the outside of the room. The required air supply distance is determined based on the length of the box body 1 and the length and type of the air duct 42. Specifically, when the air duct 42 is a straight pipe, the required air supply distance = a * the length of the box body 1 + the length of the air duct 42, where a is a constant greater than 1. When the air duct 42 is a curved pipe, the required air supply distance = a * the length of the box body 1 + the length of the straight section of the air duct 42 + k1 * the length of the first curved section + k2 * the length of the second curved section + ...k n *The length of the nth curved pipe section; where a is a constant greater than 1, and k is a constant greater than 1, which are obtained through actual experiments or simulation experiments; the smaller the turning radius of the curved pipe section, the larger k.

[0133] S3. Determine the type, quantity or gear of the fan 43 according to the required air supply distance.

[0134] S31. When the number of the fan 43 is one, the type or gear of the fan 43 is determined according to the required air supply distance.

[0135] S311 , select a fan 43 whose maximum conveying distance is greater than or equal to the required air supply distance.

[0136] S312: The speed of the fan 43 is not adjustable, or the speed of the fan 43 is adjustable, and the fan 43 is adjusted to a corresponding gear according to the required air supply distance.

[0137] S32: When the number of fans 43 is N, where N is greater than 1 and is a preset value, the maximum air supply distance of the fans 43 is determined according to the required air supply distance and the number N of the fans 43: the maximum air supply distance of the fans 43 = the required air supply distance / N.

[0138] S321. Select fan 43 according to the maximum air supply distance of fan 43. The speed of fan 43 is adjustable or non-adjustable.

[0139] S33, the type of fan 43 is a preset type, and the speed of fan 43 is adjustable or not; after the type of fan 43 is determined, whether the fan speed is adjustable and the maximum air supply distance are determined, and the number of fans 43 is determined according to the required air supply distance and the maximum air supply distance of fan 43. The number of fans 43 is ≥ the required air supply distance / the maximum air supply distance of a single fan 43, and the number of fans 43 is rounded up to an integer value.

[0140] S4. Using the required duct static pressure for fan 43 as a condition, the length and type of duct 42 are determined based on the distance between the valve box installation location and the outside of the building, and the duct static pressure is determined. The static pressure of the enclosure is also determined based on the volume and internal structure of enclosure 1. The required duct static pressure for fan 43 is determined based on the enclosure static pressure and the duct static pressure. The required duct static pressure for fan 43 = enclosure static pressure + duct static pressure.

[0141] S5. Determine the type, quantity, or gear of the fan 43 according to the air duct static pressure that the fan 43 needs to support.

[0142] S61 : When the number of the fan 43 is one, determine the type or gear position of the fan 43 according to the air duct static pressure that the fan 43 needs to support.

[0143] S611 . Select a fan 43 whose maximum supported air duct static pressure is greater than or equal to the air duct static pressure that the fan 43 needs to support.

[0144] S612: The speed of the fan 43 is not adjustable, or the speed of the fan 43 is adjustable. According to the static pressure of the air duct that the fan 43 needs to support, the fan 43 is adjusted to a corresponding gear position.

[0145] S62: When the number of fans 43 is N, where N is greater than 1 and is a preset value, the maximum duct static pressure that a single fan 43 needs to support is determined based on the duct static pressure that fan 43 needs to support and the number N of fans 43: the maximum duct static pressure that a single fan 43 needs to support = the maximum duct static pressure that fan 43 needs to support / N.

[0146] S621 . Select a fan 43 based on the maximum air duct static pressure that a single fan 43 needs to support. The speed of the fan 43 is adjustable or non-adjustable.

[0147] S63. The type of fan 43 is a preset type. The speed of fan 43 is adjustable or not. The number of fans 43 is determined based on the duct static pressure that fan 43 needs to support and the maximum duct static pressure that a single fan 43 needs to support. The number of fans 43 ≥ the duct static pressure that fan 43 needs to support / the maximum duct static pressure that a single fan 43 needs to support. The number of fans 43 is rounded up to an integer.

[0148] The length and type of the air duct 42 are determined based on the distance between the installation position of the valve box at the construction site and the outdoors. If the air duct 42 is a straight pipe or a curved pipe, the required air supply distance is determined based on the length of the air duct 42 and the length of the box body 1. The air duct static pressure can be determined based on the length and type of the air duct 42, and the air duct static pressure that the fan 43 needs to support can be determined based on the air duct static pressure and the box body static pressure. The type and number of fans 43 can be determined based on the required air supply distance or the air duct static pressure that the fan 43 needs to support, so that the fan 43 can discharge the leaked refrigerant to the outdoor environment, and the number of fans 43 can be reduced or the operating power of the fan 43 can be reduced to reduce costs. The type and number of fans 43 can be flexibly selected and set according to the construction site, so that the ventilation mechanism can adapt to different installation scenarios and be more widely used.

[0149] Example 3

[0150] This embodiment discloses a method for controlling refrigerant leakage in a valve box, wherein the valve box is the valve box in the first embodiment.

[0151] The control method for valve box refrigerant leakage mainly includes the following steps:

[0152] Whether leakage occurs in the box body 1 is determined based on the data detected by the refrigerant leakage detector 7, so as to control the opening and closing of the liquid circuit and the gas circuit of the valve box.

[0153] like Figure 19 As shown, the control method includes the following specific steps:

[0154] S1. Obtain the refrigerant concentration and concentration change rate in the box body 1, and determine whether the refrigerant in the box body 1 is leaking based on the refrigerant concentration and concentration change rate in the box body 1 to control the opening and closing of the liquid and gas paths of the valve box.

[0155] S2. Determine whether the refrigerant concentration in the box body 1 is greater than a preset concentration. The preset concentration can be obtained based on experimental results or by querying existing technologies. If not, execute S4. If yes, determine that the refrigerant in the box body 1 is leaking, and execute S3.

[0156] S3 , close the first shut-off valve 22 and the two second shut-off valves 34 , control the air valve 41 to open the air inlet 101 , and start the fan 43 .

[0157] S4. Determine whether the refrigerant concentration change rate is greater than a preset concentration change rate. The preset concentration change rate can be obtained based on experimental results or by querying existing technologies. If yes, determine that the refrigerant in the box body 1 is leaking, and execute S3. If no, execute S5.

[0158] S5. If it is determined that there is no refrigerant leakage in the box body 1, the states of the first shutoff valve 22 and the two second shutoff valves 34 are controlled according to the operating state of the indoor unit 5, and the fan 43 and the air valve 41 remain closed.

[0159] S6 , the fan 43 stops after running for a set time, and S1 is executed, and all the first shut-off valves 22 and the second shut-off valves 34 in the box body 1 remain closed.

[0160] The refrigerant concentration and concentration change rate in the box body 1 are detected in real time by the refrigerant leakage detector 7. If refrigerant leakage is found, all the first shut-off valves 22 and the second shut-off valves 34 in the box body 1 are immediately closed, and the ventilation mechanism is started, so as to timely reduce the refrigerant concentration in the box body 1 and reduce the possibility of combustion or explosion of the valve box due to excessive refrigerant concentration, thereby improving the safety of the entire air-conditioning system.

[0161] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A ventilation mechanism for a valve box, characterized in that: The ventilation mechanism includes an air duct and at least one fan, the box body of the valve box is provided with an air inlet, the air inlet end of the air duct is connected to the box body, and the air outlet end of the air duct is connected to the outdoor environment; The fan is used to discharge the gas in the box body to the outside through the air duct, and the speed of the fan or the fan combination can be adjusted according to the length of the air duct or the static pressure.

2. The ventilation mechanism for a valve box according to claim 1, characterized in that: An air valve is provided in the air inlet and / or on the air duct, and the air valve is used to control the opening or closing of the air inlet and / or the air duct.

3. The ventilation mechanism for a valve box according to claim 1, characterized in that: The fan is provided with a plurality of gears, each gear corresponds to a rotation speed, and the rotation speeds of the plurality of gears are different. Changing the gear of the fan can adjust the air supply distance of the fan.

4. The ventilation mechanism for a valve box according to claim 1, characterized in that: When there is one fan, the fan is installed on the box body, inside the air duct or on the outdoor wall; or When the number of fans is multiple; A plurality of fans are arranged in parallel on the box body, in the air duct or on an outdoor wall; or A plurality of the fans are arranged in series, and the plurality of fans are all arranged on the valve box, in the air duct, or on the outdoor wall; or a part of the fans are arranged on the box body, and another part of the fans are arranged in the air duct or on the outdoor wall; or Some of the fans are arranged in parallel or in series, and the part arranged in parallel is arranged in series with another part, and the fans in the other part are arranged in series or in parallel; or Part of the fans are arranged in parallel or in series, and the part arranged in parallel is arranged in parallel with another part, and the fans of another part are arranged in series or in parallel.

5. A method for configuring a ventilation mechanism for a valve box, characterized in that: The ventilation mechanism includes an air duct and at least one fan, the air inlet end of the air duct is connected to the box body of the valve box, and the air outlet end of the air duct is connected to the outdoor environment; The fan is of a type with adjustable speed or non-adjustable speed. When the fan speed is adjustable, the fan is provided with a plurality of gears, each gear corresponding to a speed; The configuration method comprises the following steps: Determine the required air supply distance or the air duct static pressure that the fan needs to support based on the length or static pressure of the box body, the length or static pressure of the air duct, and the type of the air duct; The type, quantity or gear of the fan is determined according to the required air supply distance or the air duct static pressure that the fan needs to support.

6. The configuration method according to claim 5, characterized in that: “Determining the required air supply distance or the air duct static pressure that the fan needs to support based on the length or static pressure of the box body, the length or static pressure of the air duct, and the type of the air duct” specifically includes: Required air supply distance = a*valve box length + air duct length; where a is a constant greater than 1; The fan needs to support the air duct static pressure = box static pressure + duct static pressure; Wherein, when the air duct is a curved pipe, the length of the air duct = the length of the straight section of the air duct + k1 * the length of the first curved section + k2 * the length of the second curved section + ...k n *The length of the nth elbow section; where k is a constant greater than 1.

7. The configuration method according to claim 6, characterized in that: “Determining the type, quantity, or gear of the fan based on the required air supply distance or the air duct static pressure that the fan needs to support” specifically includes: When there is one fan, the type or gear of the fan is determined according to the required air supply distance or the air duct static pressure that the fan needs to support; Preferably, "when there is one fan, determining the type or gear of the fan according to the required air supply distance or the air duct static pressure that the fan needs to support" includes: Select a fan with a maximum delivery distance greater than or equal to the required air delivery distance; or Select a fan whose maximum duct static pressure supported by the fan is greater than or equal to the duct static pressure that the fan needs to support; or When the speed of the fan is adjustable, the speed is adjusted to a speed at which the conveying distance is greater than or equal to the required air supply distance or a speed at which the conveying distance is greater than or equal to the static pressure of the air duct.

8. The configuration method according to claim 6, characterized in that: “Determining the type, quantity, or gear of the fan based on the required air supply distance or the air duct static pressure that the fan needs to support” specifically includes: When the number of the fans is N, where N is greater than 1; determining the type of the fan according to the required air supply distance or the air duct static pressure that the fan needs to support; Preferably, the maximum air supply distance of the fan or the maximum air duct static pressure supported by the fan is determined according to the required air supply distance or the air duct static pressure that the fan needs to support, and the number N of fans; The type of the fan is determined according to the maximum air supply distance of the fan or the maximum air duct static pressure supported by the fan.

9. The configuration method according to claim 6, characterized in that: “Determining the type, quantity, or gear of the fan based on the required air supply distance or the air duct static pressure that the fan needs to support” includes: The type of the fan is a preset type, and the number of the fans is determined according to the required air supply distance or the air duct static pressure that the fan needs to support.

10. The configuration method according to claim 9, characterized in that: “Determining the number of fans based on the required air supply distance or the air duct static pressure that the fans need to support” includes: The number of fans is greater than or equal to the required air supply distance / the maximum air supply distance of the fans, and the number of fans is rounded up; or The number of fans is greater than or equal to the air duct static pressure that the fans need to support / the maximum air duct static pressure supported by the fans, and the number of fans is rounded up.

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