Divergence box and air conditioning system with same

Abstract

The utility model provides a branch box and an air conditioning system with the same, the branch box is used on an air conditioning unit and comprises a box body, an electronic expansion valve and an electric ball valve; a liquid side flow channel and an air side flow channel are arranged in the box body, and the electronic expansion valve and the electric ball valve are installed on the box body. The electronic expansion valve is provided with a first valve needle, the liquid side flow channel is provided with a first valve port, and the first valve needle is movably arranged relative to the first valve port so as to adjust the flow channel area of the liquid side flow channel; the electric ball valve is provided with a second valve needle, the gas side flow channel is provided with a second valve port, and the second valve needle is movably arranged relative to the second valve port so as to adjust the flow channel area of the gas side flow channel. According to the utility model, the dual-channel branch box is arranged, the internal dual-flow path is arranged, the liquid side flow path is provided with the electronic expansion valve, and the gas side flow path is provided with the electric ball valve, so that the throttling and on-off functions of a liquid side refrigerant can be realized, and the on-off function of the refrigerant can be realized on the gas side.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air conditioning system technical field, concretely relates to a split box and air conditioning system with the split box. BACKGROUND

[0002] Traditional air conditioning system refrigerant is R410A (formed by two quasi-azeotropic mixtures, mainly composed of hydrogen, fluorine and carbon elements), but because its GWP value (the relative radiative influence value of a given material in a certain time integral range compared with carbon dioxide) is as high as 2200, R32 (an organic compound) as the replacement refrigerant of R410a, its GWP value is 675. Only 1 / 3 of R410a refrigerant, more environmentally friendly, so it has been widely used in household air conditioners. But R32 refrigerant has micro-flammability, and the filling amount of the unit refrigerant has the minimum area limit for the use environment, therefore, the traditional multi-split unit has a relatively large filling amount, and cannot be directly replaced by R32 refrigerant, thereby limiting the application of large unit R32 refrigerant. Because the filling amount of the multi-split unit is generally more, when R32 refrigerant leaks, the concentration reaches a certain value, and if it meets an open flame, a fire or other safety problems will occur. Although the traditional multi-split unit system is provided with refrigerant leakage detection, there is no effective way to cut off the refrigerant, and the refrigerant cannot be cut off at the source, so the problem of continuous refrigerant leakage exists. SUMMARY

[0003] The utility model provides a split box and air conditioning system with the split box, which can solve the technical problem of the current traditional multi-split unit system, which has refrigerant leakage detection, but does not have an effective way to cut off the refrigerant, cannot cut off the refrigerant at the source, and has the problem of continuous refrigerant leakage.

[0004] The utility model provides a split box for air conditioning unit, which comprises a box body, an electronic expansion valve and an electric ball valve.

[0005] The box body is provided with a liquid side flow channel and a gas side flow channel, which are isolated from each other. The electronic expansion valve and the electric ball valve are installed on the box body.

[0006] The electronic expansion valve has a first valve needle, the liquid side flow channel is provided with a first valve port, and the first valve needle is movably arranged relative to the first valve port to adjust the flow area of the liquid side flow channel. The electric ball valve has a second valve needle, the gas side flow channel has a second valve port, and the second valve needle is movably arranged relative to the second valve port to adjust the flow area of the gas side flow channel.

[0007] In some embodiments, the first valve needle comprises a first driving section and a first moving section, a first end of the first moving section extends into the liquid-side flow channel, the first end of the first moving section is arranged opposite to the first valve port, the first end of the first moving section is conical, the first valve port is a conical port, and a second end of the first moving section is connected to the first driving section.

[0008] In some embodiments, a first flow channel is formed between an outer edge of the first end of the first moving section and an inner wall of the first valve port, and a cross-sectional area of the first flow channel is constant at different positions.

[0009] In some embodiments, the second valve needle comprises a second driving section and a second moving section, a first end of the second moving section extends into the gas-side flow channel, the first end of the second moving section is arranged opposite to the second valve port, the first end of the second moving section is hemispherical, the second valve port is a spherical port, and a second end of the second moving section is connected to the second driving section.

[0010] In some embodiments, a maximum diameter of the second valve port is smaller than a maximum diameter of the first end of the second moving section, with a cross section of the cartridge as a projection plane.

[0011] In some embodiments, the electronic expansion valve comprises a first electromagnetic coil mounted on the cartridge, the first electromagnetic coil being used to drive the first valve needle to move, and the electric ball valve comprises a second electromagnetic coil mounted on the cartridge, the second electromagnetic coil being used to drive the second valve needle to move.

[0012] In some embodiments, the first valve port is convexly arranged in a radial direction of the liquid-side flow channel, and the first valve needle is movably arranged in the radial direction of the liquid-side flow channel; the second valve port is convexly arranged in a radial direction of the gas-side flow channel, and the second valve needle is movably arranged in the radial direction of the gas-side flow channel.

[0013] An air conditioning system comprises a cartridge and an air conditioning unit, the cartridge is the cartridge described above, the air conditioning unit comprises an outdoor unit and a plurality of indoor units, the plurality of indoor units are arranged in parallel, and each indoor unit is provided with the cartridge, one end of the liquid-side flow channel is communicated with a liquid pipe of the indoor unit, and the other end of the liquid-side flow channel is communicated with a liquid pipe of the outdoor unit; one end of the gas-side flow channel is communicated with a gas pipe of the indoor unit, and the other end of the gas-side flow channel is communicated with a gas pipe of the outdoor unit.

[0014] In some embodiments, the gas pipe and the liquid pipe of the indoor unit are respectively provided with a one-way valve; the liquid pipe of the outdoor unit is provided with a liquid pipe stop valve, and the gas pipe of the outdoor unit is provided with a gas pipe stop valve.

[0015] In some embodiments, the indoor unit is provided with a refrigerant sensor.

[0016] The utility model provides a kind of bifurcation box and the schematic diagram of air conditioning system with the bifurcation box, with following

[0017] Beneficial effects:

[0018] The utility model discloses when detecting that there is refrigerant leakage in air conditioning unit, first valve needle and second valve needle will move and gradually respectively close to first valve port and second valve port, until completely close liquid side flow channel and gas side flow channel, prevent the flow of gas refrigerant and liquid refrigerant, to prevent refrigerant from further leaking. By adjusting the distance between the first valve needle of electronic expansion valve and first valve port, the flow channel area of liquid side flow channel can be controlled, and then the flow of liquid refrigerant is controlled, which is crucial for maintaining the optimal performance and efficiency of air conditioning system. When the refrigeration demand of air conditioning unit is not high, by adjusting the opening of electronic expansion valve, the flow of refrigerant can be reduced, which plays the role of throttling, so that energy can be saved and the consumption of refrigerant can be reduced. Through this setting, the flow of refrigerant can be flexibly adjusted according to different refrigeration demands and environmental conditions, which improves the adaptability and energy efficiency of the system. When air conditioning unit needs to be maintained or overhauled, refrigerant can be isolated by closing these valves to ensure safe work.

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of embodiments or prior art. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the schematic diagram of bifurcation box of the utility model embodiment;

[0021] Figure 2 It is the schematic diagram of liquid side flow channel of the utility model embodiment;

[0022] Figure 3 It is the schematic diagram of gas side flow channel of the utility model embodiment;

[0023] Figure 4 It is the schematic diagram when two bifurcation boxes of the utility model embodiment are simultaneously arranged;

[0024] Figure 5 It is the schematic diagram when three bifurcation boxes of the utility model embodiment are simultaneously arranged;

[0025] Figure 6The schematic view of connecting two indoor units and an outdoor unit according to the embodiment of the present application;

[0026] FIG. 1 is a box body; 11 is a liquid side flow channel; 111 is a first valve port; 12 is a gas side flow channel; 121 is a second valve port; 2 is an electronic expansion valve; 201 is a first valve needle; 211 is a first driving section; 212 is a first moving section; 213 is a first flow channel; 202 is a first electromagnetic coil; 3 is an electric ball valve; 301 is a second valve needle; 311 is a second driving section; 312 is a second moving section; 302 is a second electromagnetic coil; 4 is an outdoor unit; 5 is an indoor unit; 6 is a check valve; 7 is a liquid pipe stop valve; 8 is a gas pipe stop valve; 9 is a refrigerant sensor. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is only illustrative in nature and by no means as any limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative labor fall within the scope of protection of the present application.

[0028] In the description of the present application, it should be understood that the orientation words such as “front, back, up, down, left, right”, “horizontal, vertical, perpendicular, horizontal” and “top, bottom” and the like indicate the orientation or position relationship generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation to the scope of protection of the present application; the orientation words “inner, outer” refer to the inner and outer of the contour of each component itself.

[0029] For the convenience of description, spatial relative terms such as “over”, “above”, “upper surface”, “upper” and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as “above” or “over” other devices or structures will be positioned “below” or “under” other devices or structures.

[0030] For the convenience of description, spatial relative terms such as “over”, “above”, “upper surface”, “upper” and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as “above” or “over” other devices or structures will be positioned “below” or “under” other devices or structures. Figure 1As shown, according to the embodiment of the utility model, provide a bifurcation box for air conditioning unit, including box body 1, electronic expansion valve 2 and electric ball valve 3, box body 1 is provided with liquid side flow channel 11 and gas side flow channel 12, liquid side flow channel 11 and gas side flow channel 12 are isolated and set up each other, electronic expansion valve 2 and electric ball valve 3 are installed on box body 1, electronic expansion valve 2 has first valve needle 201, liquid side flow channel 11 is provided with first valve port 111, first valve needle 201 is movably arranged relative to first valve port 111 to adjust the flow area of liquid side flow channel 11, electric ball valve 3 has second valve needle 301, gas side flow channel 12 has second valve port 121, second valve needle 301 is movably arranged relative to second valve port 121 to adjust the flow area of gas side flow channel 12.

[0031] Specifically, liquid side flow channel 11 is used for flowing liquid refrigerant, and gas side flow channel 12 is used for flowing gaseous refrigerant. When liquid refrigerant flows in liquid side flow channel 11, if refrigerant leakage is detected in the air conditioning unit, first valve needle 201 and second valve needle 301 move and gradually approach first valve port 111 and second valve port 121 respectively until first valve needle 201 abuts against first valve port 111 and second valve needle 301 abuts against second valve port 121. At this time, liquid side flow channel 11 and gas side flow channel 12 are both disconnected, and neither gaseous refrigerant nor liquid refrigerant can flow. In this way, after refrigerant leakage is detected, refrigerant no longer circulates in the air conditioning unit. When the refrigeration demand of the air conditioning unit is not high, the distance between first valve needle 201 and first valve port 111 can be adjusted to make electronic expansion valve 2 function as a throttling device.

[0032] In the embodiment, when refrigerant leakage is detected in the air conditioning unit, first valve needle 201 and second valve needle 301 move and gradually approach first valve port 111 and second valve port 121 respectively until liquid side flow channel 11 and gas side flow channel 12 are completely closed, preventing the flow of gaseous refrigerant and liquid refrigerant, thereby preventing further refrigerant leakage. By adjusting the distance between first valve needle 201 of electronic expansion valve 2 and first valve port 111, the flow area of liquid side flow channel 11 can be controlled, and thus the flow rate of liquid refrigerant can be controlled. This is crucial for maintaining the optimal performance and efficiency of the air conditioning system. When the refrigeration demand of the air conditioning unit is not high, the flow rate of refrigerant can be reduced by adjusting the opening of electronic expansion valve 2, thereby functioning as a throttling device. In this way, energy can be saved and the consumption of refrigerant can be reduced. Through this arrangement, the flow rate of refrigerant can be flexibly adjusted according to different refrigeration demands and environmental conditions, improving the adaptability and energy efficiency of the system. When the air conditioning unit needs to be maintained or repaired, the refrigerant can be isolated by closing these valves, ensuring safe work. The bifurcation box of the embodiment has double channels and double flow paths inside. An electronic expansion valve is arranged in the liquid side flow path, and an electric ball valve is arranged in the gas side flow path. The liquid side refrigerant can be throttled and switched on and off, and the gas side refrigerant can be switched on and off.

[0033] As a specific embodiment, the diverging box is installed on the air conditioning unit, and the diverging box can be installed on the indoor unit 5 or the outdoor unit 4. When the indoor unit 5 or the outdoor unit 4 detects refrigerant leakage, the electronic expansion valve 2 and the electric ball valve 3 are adjusted, and then the first valve needle 201 adjusts the opening and closing of the liquid side flow channel 11 and the distance between the first valve port 111, and the second valve needle 301 adjusts the opening and closing of the gas side flow channel 12, so as to cut off the refrigerant between the indoor unit 5 and the outdoor unit 4. Since R32 refrigerant has micro-flammability, when the filling amount of the unit refrigerant is large, there is a safety risk. The diverging box of the embodiment can quickly cut off the liquid side flow channel 11 and the gas side flow channel 12 when refrigerant leakage is detected, prevent further leakage of refrigerant from the source, and reduce the risk of fire and other safety accidents. Although the traditional multi-split system is provided with refrigerant leakage detection, there is no effective way to cut off the refrigerant. The diverging box of the embodiment can quickly move the first valve needle 201 and the second valve needle 301 to approach the first valve port 111 and the second valve port 121 respectively after detecting leakage, until the flow channel is completely closed, effectively cutting off the refrigerant leakage. Moreover, the flow channel and the valve are integrated in the box body 1 according to the flow of the refrigerant, which simplifies the pipeline setting.

[0034] For reference Figure 1 and Figure 2 As shown in FIGS. 1 to 3, the first valve needle 201 includes a first driving section 211 and a first moving section 212. The first end of the first moving section 212 extends into the liquid side flow channel 11, and the first end of the first moving section 212 is arranged opposite to the first valve port 111. The first end of the first moving section 212 is tapered, the first valve port 111 is a tapered port, and the second end of the first moving section 212 is connected with the first driving section 211.

[0035] Specifically, when refrigerant leakage is detected, the first driving section 211 drives the first moving section 212 to move, the first end of the first moving section 212 gradually approaches the first valve port 111, until the first valve port 111 is closed, and the first valve needle 201 no longer moves. Since the first end of the first moving section 212 is tapered and the first valve port 111 is a tapered port, the first valve needle 201 can be in maximum contact with the first valve port 111, and the liquid side flow channel 11 is closed by plugging the valve port; when the electronic expansion valve 2 functions as a throttle, a certain distance is left between the first end of the first moving section 212 and the first valve port 111, so that the liquid refrigerant can pass through.

[0036] In this embodiment, the taper of the first valve needle 201 allows the first end of the first moving section 212 to have maximum contact with the first valve port 111, achieving a good sealing effect. When a refrigerant leak is detected, the first driving section 211 drives the first moving section 212 to move, ensuring that the liquid-side flow passage 11 is completely closed, preventing refrigerant leakage and improving system safety. In normal working conditions, the first end of the first moving section 212 is kept at a certain distance from the first valve port 111, allowing liquid refrigerant to pass through. This arrangement allows the electronic expansion valve 2 to flexibly adjust the flow under different refrigeration requirements, achieving throttling effect and improving system energy efficiency and adaptability. Through the control of the driving section, the first moving section 212 can quickly respond to the detection signal of refrigerant leakage and quickly close the liquid-side flow passage 11. This rapid response capability helps to take timely measures when leakage occurs, reducing potential safety risks. In addition, the tapered contact surface helps to reduce wear between the valve needle and the valve port, prolonging the service life of the valve. Due to the smaller contact area, the degree of wear is relatively low, ensuring the reliability of the valve during long-term use.

[0037] For reference Figure 1 and Figure 2 As shown in

[0038] In this embodiment, the cross-sectional area of the flow passage remains consistent at different positions, which helps to ensure uniform flow of liquid refrigerant in the flow passage, avoiding changes in flow rate and pressure loss caused by changes in flow passage cross-section, thereby achieving more uniform flow distribution. Maintaining consistent cross-sectional area can reduce local resistance and pressure drop during fluid flow, improving system energy efficiency. When the electronic expansion valve 2 functions as a throttle, a certain distance is left between the first end of the first moving section 212 and the first valve port 111 to form a stable throttling area, which helps to improve the accuracy of refrigerant flow control. Uniform flow passage helps to maintain system stability under different working conditions, especially when the refrigerant flow changes, reducing system pressure fluctuations caused by improper flow passage arrangement.

[0039] For reference Figure 1 and Figure 3 As shown in

[0040] Specifically, when detecting refrigerant leakage, the second driving section 311 drives the second moving section 312 to move, and the first end of the second moving section 312 gradually approaches the second valve port 121 until the second valve port 121 is closed, and the second valve needle 301 no longer moves. Since the first end of the second moving section 312 is hemispherical, the second valve port 121 is a hemispherical port, and the second valve needle 301 can penetrate into the second valve port 121 and maximally block the valve port to close the gas side flow channel 12 by blocking the valve port.

[0041] In this embodiment, compared to the electronic expansion valve 2 which needs to throttle, the electric ball valve 3 in this embodiment only needs to function as an on-off valve and does not need to throttle. The electric ball valve 3 only needs to function as an on-off valve and does not need complex throttling functions, which simplifies the structure of the valve and reduces manufacturing costs and maintenance difficulty. The hemispherical arrangement of the second valve needle 301 enables the first end of the second moving section 312 to penetrate into the spherical port of the second valve port 121 to achieve rapid and tight sealing. When detecting refrigerant leakage, the second driving section 311 rapidly drives the second moving section 312 to move until the gas side flow channel 12 is completely closed, effectively preventing further leakage of refrigerant. The hemispherical second moving section 312 and the spherical port arrangement provide a larger contact area, which helps to provide better sealing effect when closed, improving the reliability of the system.

[0042] For reference Figure 1 and Figure 3 As shown in the cross-sectional view of the box body 1, the maximum diameter of the second valve port 121 is smaller than the maximum diameter of the first end of the second moving section 312.

[0043] In this embodiment, considering that the electric ball valve 3 only needs to function as an on-off valve for the flow channel, the diameter of the second valve port 121 is smaller than the diameter of the first end of the second moving section 312. When the first end (hemispherical) of the second moving section 312 contacts the second valve port 121 (spherical port), a more tight seal can be achieved. This arrangement helps to provide better sealing effect when closing the gas side flow channel 12, preventing refrigerant leakage. Moreover, the smaller valve port diameter means that the first end of the second moving section 312 can cover the valve port area faster when closed, thereby speeding up the closing speed and improving the response speed of the system. Although the electric ball valve 3 only functions as an on-off valve in this embodiment and does not need to throttle, this arrangement still helps to achieve more precise control when needed, as it can ensure that no additional refrigerant passes through when closed, thereby improving the control accuracy of the system.

[0044] For reference Figures 1 to 3As shown, the first valve port 111 is protrudingly arranged in the radial direction of the liquid-side flow passage 11, and the first valve needle 201 is movably arranged in the radial direction of the liquid-side flow passage 11; the second valve port 121 is protrudingly arranged in the radial direction of the gas-side flow passage 12, and the second valve needle 301 is movably arranged in the radial direction of the gas-side flow passage 12.

[0045] Specifically, when the liquid-side flow passage 11 and the gas-side flow passage 12 are both vertical (as shown in the figure), when the refrigerant leakage is detected, the first driving section 211 drives the first moving section 212 to move left and right, the first end of the first moving section 212 gradually approaches the first valve port 111 until the first valve port 111 is closed, and the first valve needle 201 no longer moves. Since the first end of the first moving section 212 is conical and the first valve port 111 is a conical port, the first valve needle 201 can be in maximum contact with the first valve port 111, thereby closing the liquid-side flow passage 11 by plugging the valve port; when the electronic expansion valve 2 functions as a throttling device, a certain distance is left between the first end of the first moving section 212 and the first valve port 111, so that the liquid refrigerant can pass through; At the same time, the second driving section 311 drives the second moving section 312 to move left and right, the first end of the second moving section 312 gradually approaches the second valve port 121 until the second valve port 121 is closed, and the second valve needle 301 no longer moves. Since the first end of the second moving section 312 is hemispherical and the second valve port 121 is a hemispherical port, the second valve needle 301 can be deeply inserted into the second valve port 121 and can plug the valve port to the maximum, thereby closing the gas-side flow passage 12 by plugging the valve port.

[0046] In this embodiment, the radial movability of the valve needle allows the valve needle to achieve maximum contact with the valve port, whether it is conical or hemispherical, which can provide good sealing performance and effectively prevent refrigerant leakage. The radial protrusion of the valve port helps to achieve compactness of the structure, so that the valve body can be made smaller to save space while maintaining complete functionality. Considering the problem that the valve needle deeply inserted into the flow passage affects the flow of refrigerant, the radial protrusion of the valve port allows the valve needle to quickly move to the valve port position, achieving rapid closing of the liquid-side flow passage 11 and the gas-side flow passage 12, and also expanding the original flow passage cross-sectional area in this way, reducing the influence of the valve needle on the refrigerant flow.

[0047] For reference Figures 1 to 3 As shown, the electronic expansion valve 2 includes a first electromagnetic coil 202 mounted on the box body 1, and the first electromagnetic coil 202 is used to drive the first valve needle 201 to move; the electric ball valve 3 includes a second electromagnetic coil 302 mounted on the box body 1, and the second electromagnetic coil 302 is used to drive the second valve needle 301 to move.

[0048] In the embodiment, the first electromagnetic coil 202 drives the first driving section 211 to move, and the second electromagnetic coil 302 drives the second driving section 311 to move. The electromagnetic coils can accurately drive the valve needle to move according to the instruction of the controller, and realize the accurate control of the liquid-side flow channel 11 and the gas-side flow channel 12. The accurate control helps to adjust the refrigerant flow and optimize the performance of the air conditioning system. The driving mode of the electromagnetic coil is more reliable and durable than the mechanical driving mode, reduces the problems caused by mechanical wear, and prolongs the service life of the valve.

[0049] For reference Figures 1 to 6 As shown in FIG. 6, an air conditioning system includes a distribution box, an outdoor unit 4, and a plurality of indoor units 5. The distribution box is the distribution box described above. The plurality of indoor units 5 are connected in parallel, and each indoor unit 5 is provided with a distribution box. One end of the liquid-side flow channel 11 is connected with a liquid pipe of the indoor unit 5, and the other end of the liquid-side flow channel 11 is connected with a liquid pipe of the outdoor unit 4. One end of the gas-side flow channel 12 is connected with a gas pipe of the indoor unit 5, and the other end of the gas-side flow channel 12 is connected with a gas pipe of the outdoor unit 4.

[0050] In the embodiment, the indoor unit 5 is provided with a refrigerant sensor 9.

[0051] Specifically, Figure 4 FIG. 7 is a schematic view of an air conditioning system provided with two distribution boxes, Figure 5 FIG. 8 is a schematic view of an air conditioning system provided with three distribution boxes, Figure 6For the schematic diagram of setting two diverging boxes and two indoor units 5, since the embodiment is a multi-split air conditioner, multiple indoor units 5 are connected with the same outdoor unit 4, but when two indoor units 5 are set, two sets of double-channel diverging boxes are connected in parallel, and each indoor unit 5 inlet and outlet pipe is connected with a diverging box respectively, and the action of the electromagnetic valve module coil of the diverging box is controlled by the main control board of the diverging box. The electric control board is a component of the air conditioning unit, and the working process of the air conditioning system is as follows: when the first indoor unit 5 is started to run in cooling mode, and the second indoor unit 5 is turned off, at this time, the outdoor unit 4 of the multi-split air conditioner runs in cooling mode; when the refrigerant sensor 9 of the first indoor unit 5 detects that the refrigerant concentration ≤ A%, the safety cutoff diverging box controls as follows: the electric ball valve 3 and the electric ball valve 3 of the diverging box corresponding to the first indoor unit 5 are opened to the maximum, and the electric ball valve 3 and the electric ball valve 3 of the diverging box corresponding to the second indoor unit 5 are closed. The refrigerant circulates as follows: the high-temperature and high-pressure liquid refrigerant from the outdoor unit passes through the electronic expansion valve 2 to become low-temperature and low-pressure refrigerant, enters the first indoor unit 5, absorbs heat after passing through the heat exchanger to become low-temperature and low-pressure gas, passes through the electric ball valve 3 of the gas side flow channel 12, and returns to the gas pipe of the outdoor unit 4, forming a complete refrigerant circulation. Since the electronic expansion valve 2 and the electric ball valve 3 of the second diverging box are not opened, the refrigerant is cut off in front of the electronic expansion valve 2, and there is no refrigerant circulation. When the refrigerant sensor 9 of the first indoor unit 5 detects that the refrigerant concentration > A%, the first indoor unit 5 sends a refrigerant leakage warning, and at the same time, the capacity demand of the indoor unit 5 is set to 0, and the safety cutoff diverging box controls as follows: the valve ports corresponding to the electric ball valve 3 and the electric ball valve 3 of the first diverging box are closed, and the electronic expansion valve 2 and the electronic expansion valve 2 of the second diverging box are also closed. At this time, since there is no demand for indoor unit 5, the outdoor unit 4 is in the shutdown state, there is no refrigerant circulation, and the refrigerant is closed in front of the electric ball valve 3 of the first diverging box and the electric ball valve 3 of the second diverging box, and in front of the electronic expansion valve 2 of the second diverging box and the electronic expansion valve 2 of the first diverging box. Therefore, the safety cutoff diverging box plays a role in cutting off the refrigerant, preventing the refrigerant from continuously leaking in the indoor unit room. At the same time, once the refrigerant leakage warning is sent, it cannot be automatically restored, and the indoor unit 5 can only be normally operated after the warning is removed by the engineer after on-site detection, but other indoor units 5 are not affected.

[0052] Specifically, when the first indoor unit 5 and the second indoor unit 5 are both in refrigeration operation, the multi-connected outdoor unit 4 is in refrigeration operation; when the refrigerant sensors 9 of the first indoor unit 5 and the second indoor unit 5 detect that the refrigerant concentration is all ≤ A%, the safety cut-off diverging box controls as follows: the electric ball valves 3 of the first diverging box and the second diverging box are opened to the maximum, and the electronic expansion valves 2 of the first diverging box and the second diverging box are controlled according to the normal opening degree. The refrigerant circulation branch one: the high-temperature and high-pressure liquid refrigerant from the outdoor unit 4 is throttled into low-temperature and low-pressure refrigerant after passing through the electronic expansion valve 2 of the first diverging box, enters the first indoor unit 5, is heated into low-temperature and low-pressure gas after passing through the heat exchanger, passes through the electric ball valve 3 of the first diverging box, and then returns to the gas pipe of the outdoor unit 4, forming a complete refrigerant circulation. The circulation branch two: the high-temperature and high-pressure liquid refrigerant from the outdoor unit 4 is throttled into low-temperature and low-pressure refrigerant after passing through the electronic expansion valve 2 of the second diverging box, enters the second indoor unit 5, is heated into low-temperature and low-pressure gas after passing through the heat exchanger, passes through the electric ball valve 3 of the second diverging box, and then returns to the gas pipe of the outdoor unit 4, forming a complete refrigerant circulation. Only when the refrigerant sensor 9 of the first indoor unit 5 detects that the refrigerant concentration is > A%, the first indoor unit 5 sends a refrigerant leakage warning, and at the same time, the capacity requirement of the indoor unit 5 is set to 0, and the safety cut-off diverging box controls as follows: the electric ball valve 3 of the first diverging box is closed, the electric ball valve 3 of the second diverging box is opened, the electronic expansion valve 2 of the first diverging box is closed, and the electronic expansion valve 2 of the second diverging box is normally controlled. The refrigerant of the circulation branch one cannot circulate, and the refrigerant of the circulation branch two still circulates according to the normal working state. When the refrigerant sensor 9 of the second indoor unit 5 detects that the refrigerant concentration is > A%, the second indoor unit 5 sends a refrigerant leakage warning, and at the same time, the capacity requirement of the indoor unit is set to 0, and the safety cut-off diverging box controls as follows: the electric ball valve 3 of the first diverging box is opened, the electric ball valve 3 of the second diverging box is closed, the electronic expansion valve 2 of the first diverging box is normally controlled, and the electronic expansion valve 2 of the second diverging box is closed. The refrigerant of the circulation branch two cannot circulate, and the refrigerant of the circulation branch one still circulates according to the normal working state. When the refrigerant sensors 9 of the first indoor unit 5 and the second indoor unit 5 detect that the refrigerant concentration is all > A%, the second indoor unit 5 and the first indoor unit 5 send a refrigerant leakage warning, and at the same time, the capacity requirements of the two indoor units are set to 0, and the safety cut-off diverging box controls as follows: the electric ball valve 3 of the first diverging box is closed, the electric ball valve 3 of the second diverging box is closed, the electronic expansion valve 2 of the first diverging box is closed, and the electronic expansion valve 2 of the second diverging box is closed. The refrigerant in the circulation branch one and the circulation branch two cannot circulate. Since there is no indoor unit 5 requirement, the outdoor unit 4 is in the shutdown state, the refrigerant is closed in front of the electric ball valve 3 of the first diverging box and the electric ball valve 3 of the second diverging box, and in front of the electronic expansion valve 2 of the first diverging box and the electronic expansion valve 2 of the second diverging box.Therefore, the safety cut-off diverging box plays the role of cutting off the refrigerant, preventing the refrigerant from continuously leaking in the indoor unit room. Similarly, once the refrigerant leakage warning is issued, it cannot be automatically restored, and the indoor unit can only be normally operated after the engineer detects and removes the warning, but other indoor units 4 are not affected.

[0053] In this embodiment, the refrigerant sensor 9 provided in the indoor unit 5 can monitor the concentration of the refrigerant in real time, and can quickly issue an alarm and start safety measures once an anomaly such as refrigerant leakage is detected. The diverging box allows the refrigerant to be evenly distributed to each indoor unit 5, ensuring that each indoor unit 5 can receive appropriate refrigerant supply to meet its respective cooling or heating requirements. By reasonably distributing the refrigerant, the diverging box helps maintain stable operation of the entire system and ensures the temperature control accuracy of each room. The multi-split system can start the outdoor module accordingly to meet the indoor cooling and heating load requirements in a timely manner according to the operating load requirements of the indoor unit 5. The double-channel diverging box is internally provided with a double-flow path, the liquid-side flow path is provided with an electronic expansion valve 2, and the gas-side flow path is provided with an electric ball valve 3, which can realize the throttling and on-off functions of the liquid-side refrigerant, and the gas-side realizes the on-off function of the refrigerant. A safety cut-off diverging module device can be formed by connecting multiple double-channel electromagnetic valve modules in parallel, and the outlet is directly connected to multiple indoor units to realize the on-off of the refrigerant of multiple indoor units. The indoor unit 5 is provided with a refrigerant leakage detection sensor, which sends a refrigerant leakage instruction to the diverging box module when detecting refrigerant leakage, and the safety cut-off diverging module automatically closes the electric ball valve 3 and the electronic expansion valve 2 corresponding to the indoor unit to cut off the refrigerant source of the indoor unit.

[0054] For reference Figures 1 to 6 As shown in the figure, the gas pipe and the liquid pipe of the indoor unit 5 are respectively provided with a one-way valve 6; the liquid pipe of the outdoor unit 4 is provided with a liquid pipe stop valve 7, and the gas pipe of the outdoor unit 4 is provided with a gas pipe stop valve 8.

[0055] In this embodiment, the stop valve can control the amount and direction of refrigerant flow, and the connection and disconnection between devices are completed by the stop valve. The stop valves on the liquid pipe and the gas pipe of the outdoor unit 4 facilitate system detection and maintenance when needed, such as refrigerant charging or pressure detection.

[0056] Those skilled in the art will readily understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0057] The above merely is the preferred embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement and improvement etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is merely the preferred embodiment of the present application, and it should be pointed out that, for the ordinary skilled in the art, without departing from the technical principle of the present application, a number of improvements and modifications can be made, and these improvements and modifications shall be considered as the protection scope of the present application.

Claims

1. A branch box for use on an air conditioning unit, characterized in that: include: Box body (1), electronic expansion valve (2) and electric ball valve (3); The box body (1) is provided with a liquid side flow channel (11) and a gas side flow channel (12), the liquid side flow channel (11) and the gas side flow channel (12) are isolated from each other, and the electronic expansion valve (2) and the electric ball valve (3) are installed on the box body (1); The electronic expansion valve (2) has a first valve needle (201), the liquid side flow channel (11) is provided with a first valve port (111), and the first valve needle (201) is movably arranged relative to the first valve port (111) to adjust the flow area of ​​the liquid side flow channel (11); the electric ball valve (3) has a second valve needle (301), the gas side flow channel (12) has a second valve port (121), and the second valve needle (301) is movably arranged relative to the second valve port (121) to adjust the flow area of ​​the gas side flow channel (12).

2. The branch box according to claim 1, characterized in that: The first valve needle (201) includes a first driving section (211) and a first moving section (212), the first end of the first moving section (212) extends into the liquid side flow channel (11), the first end of the first moving section (212) is arranged opposite to the first valve port (111), the first end of the first moving section (212) is conical, the first valve port (111) is a conical port, and the second end of the first moving section (212) is connected to the first driving section (211).

3. The branch box according to claim 2, characterized in that: A first flow channel (213) is formed between the outer edge of the first end of the first moving section (212) and the inner wall of the first valve port (111), and the cross-sectional areas of the first flow channel (213) at different positions are the same.

4. The branch box according to claim 1, characterized in that: The second valve needle (301) includes a second driving section (311) and a second moving section (312), the first end of the second moving section (312) extends into the gas side flow channel (12), the first end of the second moving section (312) is arranged opposite to the second valve port (121), the first end of the second moving section (312) is hemispherical, the second valve port (121) is a spherical port, and the second end of the second moving section (312) is connected to the second driving section (311).

5. The branch box according to claim 4, characterized in that: Taking the cross section of the box body (1) as a projection surface, the maximum diameter of the second valve port (121) is smaller than the maximum diameter of the first end of the second movable section (312).

6. The branch box according to claim 1, characterized in that: The electronic expansion valve (2) comprises a first electromagnetic coil (202), the first electromagnetic coil (202) is mounted on the box body (1), and the first electromagnetic coil (202) is used to drive the first valve needle (201) to move; the electric ball valve (3) comprises a second electromagnetic coil (302), the second electromagnetic coil (302) is mounted on the box body (1), and the second electromagnetic coil (302) is used to drive the second valve needle (301) to move.

7. The branch box according to any one of claims 1 to 6, characterized in that: The first valve port (111) is protruding in the radial direction of the liquid side flow channel (11), and the first valve needle (201) is movably arranged in the radial direction of the liquid side flow channel (11); the second valve port (121) is protruding in the radial direction of the gas side flow channel (12), and the second valve needle (301) is movably arranged in the radial direction of the gas side flow channel (12).

8. An air conditioning system, comprising a branch box and an air conditioning unit, characterized in that: The branch box is a branch box according to any one of claims 1 to 7, and the air-conditioning unit includes an outdoor unit (4) and multiple indoor units (5), the multiple indoor units (5) are arranged in parallel, and each of the indoor units (5) is provided with the branch box, one end of the liquid side flow channel (11) is connected to the liquid pipe of the indoor unit (5), and the other end of the liquid side flow channel (11) is connected to the liquid pipe of the outdoor unit (4); one end of the gas side flow channel (12) is connected to the gas pipe of the indoor unit (5), and the other end of the gas side flow channel (12) is connected to the gas pipe of the outdoor unit (4).

9. The air conditioning system according to claim 8, characterized in that The gas pipe and liquid pipe of the indoor unit (5) are respectively provided with a one-way valve (6); the liquid pipe of the outdoor unit (4) is provided with a liquid pipe stop valve (7), and the gas pipe of the outdoor unit (4) is provided with a gas pipe stop valve (8).

10. The air conditioning system according to claim 8, characterized in that The indoor unit (5) is provided with a refrigerant sensor (9).

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