Outdoor heat exchanger and HVAC system

Abstract

An embodiment of the present application provides an outdoor heat exchanger and a HVAC system, which relate to the field of HVAC technology. A second refrigerant pipe is connected between the second port of the filter and the throttling assembly. The second refrigerant pipe includes a first pipe section connected to the second port. The first pipe section extends in a horizontal direction, or the tangent direction of any point on the first pipe section is inclined relative to the horizontal line. In this way, the horizontal cross-sectional area of ​​the first pipe section is significantly increased, thereby reducing the possibility of the oil column blocking the first pipe section, thereby reducing the probability of system vacuuming and failure shutdown.

Description

Technical Field

[0001] The present application relates to the field of HVAC technology, and in particular to an outdoor heat exchanger and a HVAC system. Background Art

[0002] To avoid clogging of the throttle valve, a heat pump system generally adds filters at the inlet and outlet of the throttle valve. When the heat pump system heats at low temperature for a certain period of time, there is a lot of frost on the outdoor condenser, which needs to be defrosted. Refrigeration is needed to defrost. Due to the presence of lubricating oil in the pipeline, during the process of the heat pump system switching from low-temperature heating to cooling, oil seals and oil blockages are easily formed between the throttle valve and the filter, which in turn causes the system to be vacuumed and shut down due to failure. Summary of the invention

[0003] The present application provides an outdoor heat exchanger and a HVAC system, which can improve the problem in the related art that lubricating oil forms an oil seal and oil blockage between a throttle valve and a filter, thereby causing system vacuuming and fault shutdown.

[0004] In a first aspect, an embodiment of the present application provides a heat exchanger, the heat exchanger being used to communicate with a throttling component in a HVAC system, the heat exchanger comprising:

[0005] Heat exchanger body;

[0006] A filter having a first port and a second port;

[0007] a first refrigerant pipe connected between the heat exchanger body and the first port of the filter;

[0008] The second refrigerant pipe is connected between the second port of the filter and the throttling assembly. The second refrigerant pipe includes a first pipe section connected to the second port. The first pipe section extends in a horizontal direction, or the tangent direction of any point on the first pipe section is inclined relative to the horizontal line.

[0009] In some embodiments, the angle between the tangent direction of any point on the first pipe segment and the horizontal line is less than or equal to 30°.

[0010] In some embodiments, the first pipe segment comprises:

[0011] A straight pipe segment extends along a straight direction.

[0012] In some embodiments, when the first pipe segment extends in a horizontal direction, the straight pipe segment includes a horizontal pipe segment, and the horizontal pipe segment extends in a horizontal direction; or,

[0013] When the tangent direction of any point on the first pipe segment is inclined relative to the horizontal line, the straight pipe segment includes an inclined pipe segment, and the inclined pipe segment includes a first inclined pipe segment, and the first inclined pipe segment extends obliquely downward along the refrigerant transmission direction from the second refrigerant pipe to the filter; or,

[0014] When the tangent direction of any point on the first pipe segment is inclined relative to the horizontal line, the straight pipe segment includes an inclined pipe segment, and the inclined pipe segment includes a second inclined pipe segment, and the second inclined pipe segment extends upward along the refrigerant transmission direction from the second refrigerant pipe to the filter.

[0015] In some embodiments, the first pipe segment comprises:

[0016] The curved pipe segment includes at least one of a first curved pipe segment and a second curved pipe segment. Along the refrigerant transmission direction from the second refrigerant pipe to the filter, the first curved pipe segment bends downward and the second curved pipe segment bends upward.

[0017] In some embodiments, the second refrigerant pipe further includes:

[0018] The second pipe section is used to connect the throttling assembly, the second pipe section is connected to the first pipe section, and the second pipe section extends vertically from top to bottom along the refrigerant transmission direction from the second refrigerant pipe to the filter.

[0019] In some embodiments, along the refrigerant transmission direction from the second refrigerant pipe to the filter, the length of the first pipe section is greater than the length of the first refrigerant pipe.

[0020] In some embodiments, the first refrigerant pipe extends in a horizontal direction.

[0021] In some embodiments, the extending direction of the portion of the first refrigerant pipe connected to the first port is the same as the direction of the opening of the first port;

[0022] And / or, the extending direction of the portion of the pipeline of the first pipe section connected to the second port is the same as the opening direction of the second port.

[0023] In a second aspect, an embodiment of the present application provides a HVAC system, including:

[0024] The outdoor heat exchanger mentioned above;

[0025] compressor;

[0026] Indoor heat exchangers; and

[0027] The throttling component, the compressor, the outdoor heat exchanger, the throttling component and the indoor heat exchanger are connected in sequence.

[0028] The outdoor heat exchanger and HVAC system provided in the embodiments of the present application have a second refrigerant pipe connected between the second port of the filter and the throttling assembly, and the second refrigerant pipe includes a first pipe section connected to the second port, and the first pipe section extends in a horizontal direction, or the tangent direction of any point on the first pipe section is inclined relative to the horizontal line. In this way, the horizontal cross-sectional area of ​​the first pipe section is significantly increased, thereby reducing the possibility of the oil column blocking the first pipe section, thereby reducing the probability of system vacuuming and fault shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a structural schematic diagram of the refrigerant flow direction of a HVAC system in a heating mode in an embodiment of the present application;

[0031] Figure 2 This is a structural schematic diagram of the refrigerant flow direction of a HVAC system in a cooling mode in an embodiment of the present application;

[0032] Figure 3 It is a schematic diagram of the structure of the lubricating oil forming an oil column in the HVAC system in the prior art;

[0033] Figure 4 A schematic diagram of the structure of the lubricating oil forming an oil column in the first pipe section provided in the first embodiment of the present application;

[0034] Figure 5 A schematic diagram of the structure of the lubricating oil forming an oil column in the first pipe section provided in the second embodiment of the present application;

[0035] Figure 6 A schematic diagram of the structure of the first pipe section provided in the first embodiment of the present application;

[0036] Figure 7 A schematic diagram of the structure in which lubricating oil in a first pipe section is attached to the inner side wall of the first pipe section provided in the first embodiment of the present application;

[0037] Figure 8 A schematic structural diagram of a first pipe section provided for a second embodiment of the present application;

[0038] Fig. 9 A schematic diagram of the structure in which lubricating oil in a first pipe section is attached to the inner side wall of the first pipe section provided in the second embodiment of the present application;

[0039] Fig.10A schematic diagram of the structure of the first pipe section in the second refrigerant pipe provided in the third embodiment of the present application;

[0040] Fig.11 A schematic diagram of the structure in which lubricating oil in a first pipe section is attached to the inner wall of the first pipe section provided in the third embodiment of the present application.

[0041] Description of reference numerals:

[0042] 1. HVAC system; 2. Lubricating oil;

[0043] 10. Outdoor heat exchanger;

[0044] 11. heat exchanger body; 12. filter; 12a. first port; 12b. second port; 13. first refrigerant pipe; 14. second refrigerant pipe; 141. first pipe section; 1411. straight pipe section; 1411a. first inclined pipe section; 1411b. second inclined pipe section; 1412. curved pipe section; 1412a. first curved pipe section; 1413. top line section; 1414. bottom line section; 142. second pipe section;

[0045] 20. Compressor;

[0046] 30. Throttle assembly;

[0047] 40. Indoor heat exchanger;

[0048] 50. Four-way valve. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] See also Figure 1 and Figure 2 The embodiment of the present application provides a HVAC system, and the HVAC system 1 includes air conditioners, multi-split units, heat pumps and other systems for heating and cooling, which are not limited in the embodiment of the present application.

[0051] The HVAC system 1 includes an outdoor heat exchanger 10, an indoor heat exchanger 40, a compressor 20 and a throttling assembly 30, wherein the compressor 20, the outdoor heat exchanger 10, the throttling assembly 30 and the indoor heat exchanger 40 are sequentially connected. The compressor 20 is used to compress the refrigerant, the outdoor heat exchanger 10 and the indoor heat exchanger 40 are used to realize heat exchange between the refrigerant and the outside, and the throttling assembly 30 is used to play the role of throttling and reducing pressure.

[0052] The throttling component 30 may be any throttling component in the related art. For example, the throttling component 30 may be an electronic expansion valve, a throttling valve, etc., which is not limited. In the embodiment of the present application, the throttling component 30 includes an electronic expansion valve. The electronic expansion valve is driven by a controller, and the time taken to switch from a fully closed state to a fully open state is short, the reaction and action speed are fast, there is no static superheat phenomenon, and the opening and closing characteristics and speed can be manually set, which is more flexible to use.

[0053] During the operation of the HVAC system 1, the outdoor heat exchanger 10 is arranged outdoors, and the indoor heat exchanger 40 is arranged indoors, that is, the indoor heat exchanger 40 is arranged in the indoor unit of the HVAC system 1, and the compressor 20, the outdoor heat exchanger 10 and the throttling component 30 are arranged in the outdoor unit of the HVAC system 1. The HVAC system 1 has a cooling mode and a heating mode.

[0054] See also Figure 1 In the heating mode, the compressor 20 outputs high-temperature and high-pressure gaseous refrigerant, which is transmitted to the indoor heat exchanger 40 and condensed and heat-exchanged to become a high-pressure and normal-temperature liquid refrigerant. The high-pressure and normal-temperature liquid refrigerant is further transmitted to the throttling component 30 and throttled and depressurized to become a low-temperature and low-pressure gas-liquid mixed refrigerant. Then, the low-temperature and low-pressure gas-liquid mixed refrigerant enters the outdoor heat exchanger 10 and evaporates and heat-exchanges to become a low-temperature and low-pressure gaseous refrigerant. Finally, the low-temperature and low-pressure gaseous refrigerant flows back to the compressor 20, completing a complete heating cycle. In this process, the refrigerant in the outdoor heat exchanger 10 is always in a state of absorbing heat from the outside, so it will frost on the surface of the outdoor heat exchanger 10, and the frost will affect the heat exchange of the outdoor heat exchanger 10, and then affect the operation of the entire HVAC system 1.

[0055] See also Figure 2 In the cooling mode, the compressor 20 outputs a high-temperature and high-pressure gaseous refrigerant, which is transmitted to the outdoor heat exchanger 10 and condensed and heat-exchanged to become a high-pressure and normal-temperature liquid refrigerant. The high-pressure and normal-temperature liquid refrigerant is further transmitted to the throttling component 30 and throttled and depressurized to become a low-temperature and low-pressure gas-liquid mixed refrigerant. Then, the low-temperature and low-pressure gas-liquid mixed refrigerant enters the indoor heat exchanger 40 and evaporates and heat-exchanges to become a low-temperature and low-pressure gaseous refrigerant. Finally, the low-temperature and low-pressure gaseous refrigerant flows back to the compressor 20, completing a complete refrigeration cycle. During this process, the refrigerant of the outdoor heat exchanger 10 will release heat to the outside. By switching from the heating process to the cooling process, the frost on the surface of the outdoor heat exchanger 10 can absorb heat and melt, thereby achieving defrosting.

[0056] It should be noted that the HVAC system 1 may further include a four-way valve 50, which is used to switch the forward and reverse flow directions of the refrigerant. Figure 1 as well as Figure 2For example, in the heating mode, the flow path of the refrigerant is: compressor 20--four-way valve 50--indoor heat exchanger 40--throttling component 30--outdoor heat exchanger 10--four-way valve 50--compressor 20; while in the cooling mode, the flow path of the refrigerant is: compressor 20--four-way valve 50--outdoor heat exchanger 10--throttling component 30--indoor heat exchanger 40--four-way valve 50--compressor 20.

[0057] During the installation and maintenance of the pipes and equipment in the HVAC system 1, impurities may be present in the refrigerant system. These impurities have the disadvantages of blocking the flow channel of the refrigerant, increasing the system pressure loss, and reducing the refrigeration efficiency. Therefore, they need to be filtered. Therefore, the outdoor heat exchanger 10 and the indoor heat exchanger 40 both include a filter 12. In the related art, the filter 12 is vertically arranged, and the filter 12 in the indoor heat exchanger 40 is located at the upper end of the throttling assembly 30, and the filter 12 in the outdoor heat exchanger 10 is located at the lower end of the throttling assembly 30.

[0058] In order to increase lubrication and ensure the normal operation of the compressor 20, the compressor 20 is provided with lubricating oil 2, which will be more or less mixed into the refrigerant and transmitted together with the refrigerant. When the HVAC system 1 is heating, it is generally heated at a lower temperature. After a long period of heating, since the refrigerant passing through the outdoor heat exchanger 10 is always in a state of absorbing heat from the outside, frost will form on the surface of the outdoor heat exchanger 10, and the frost will affect the heat exchange of the outdoor heat exchanger 10, and then affect the operation of the entire HVAC system 1. Also under low temperature conditions, the concentration of the lubricating oil 2 will increase, the viscosity will increase, and the fluidity will deteriorate, especially between the throttling component 30 and the filter 12 of the outdoor heat exchanger 10 in the outdoor unit.

[0059] In order to remove frost on the surface of the outdoor heat exchanger 10, the HVAC system 1 can be switched from the heating mode to the cooling mode in combination with the above-mentioned HVAC system 1. The refrigerant of the outdoor heat exchanger 10 releases heat to the outside in the cooling mode, so that the frost on the surface of the outdoor heat exchanger 10 absorbs heat and melts, thereby achieving defrosting. However, in the process of switching the HVAC system 1 from the heating mode to the cooling mode, the throttling component 30 needs to be switched from a partially open state to a fully open state to balance the pressure on both sides of the throttling component 30. However, since the throttling component 30 is in a fully open state, the refrigerant on the upper side of the throttling component 30 will flow to the lower side of the throttling component 30 under the action of gravity and pressure difference, and the lubricating oil 2 in the refrigerant is easily deposited in the pipeline between the throttling component 30 and the filter 12 of the outdoor heat exchanger 10, covering the entire cross-section of the pipeline, forming an oil column, such as Figure 3 shown.

[0060] In order to remove frost on the surface of the outdoor heat exchanger 10, after the HVAC system 1 switches from the heating mode to the cooling mode, the refrigerant with a lower temperature inside the outdoor heat exchanger 10 will flow to the throttling component 30, which will cause the oil viscosity of the oil column to be greater, thereby blocking the pipeline between the throttling component 30 and the filter 12 in the outdoor heat exchanger 10, making it difficult for the normally flowing refrigerant to break through the oil column, causing the entire HVAC system 1 to be unbalanced, and further leading to problems such as vacuuming and fault shutdown of the compressor 20. Based on this, the embodiment of the present application provides an outdoor heat exchanger 10 for improving the problem of easy blockage of the pipeline between the throttling component 30 and the filter 12 in the outdoor heat exchanger 10.

[0061] See also Figure 1-2 Specifically, the outdoor heat exchanger 10 of the embodiment of the present application is used to communicate with the throttling component 30 in the HVAC system 1. The outdoor heat exchanger 10 includes a heat exchanger body 11, a filter 12, a first refrigerant pipe 13, and a second refrigerant pipe 14, wherein the filter 12 has a first port 12a and a second port 12b, the first refrigerant pipe 13 is connected between the heat exchanger body 11 and the first port 12a of the filter 12, the second refrigerant pipe 14 is connected between the second port 12b of the filter 12 and the throttling component 30, and the second refrigerant pipe 14 includes a first pipe section 141 connected to the second port 12b, the first pipe section 141 extends in a horizontal direction, or the tangent direction of any point on the first pipe section 141 is inclined relative to the horizontal line. It should be noted that the tangent direction of any point on the first pipe section 141 is inclined relative to the horizontal line, which can also be understood as the tangent of any point on the central axis of the first pipe section 141 is inclined relative to the horizontal line, wherein the central axis of the first pipe section 141 is the line connecting the midpoints of each cross section of the first pipe section 141.

[0062] In the embodiment of the present application, since the first pipe section 141 is connected to the second port 12b of the filter 12, the first pipe section 141 extends in the horizontal direction, or the tangent direction of any point on the first pipe section 141 is inclined relative to the horizontal line. Figure 4-5 The area of ​​the horizontal cross-section of the upper end of the lubricating oil 2 distributed in the first pipe section 141 is larger than the area of ​​the horizontal cross-section of the upper end of the lubricating oil 2 between the throttling assembly 30 and the filter 12 in the related art. In this way, the lubricating oil 2 accumulated in the first pipe section 141 is difficult to form an oil column that blocks the horizontal cross-section of the entire first pipe section 141, that is, a gap will be left between the oil column and the first pipe section 141, and the refrigerant can flow through the gap, thereby establishing a stable pressure difference for the entire HVAC system 1, so that the refrigerant can flush out the oil column and ensure the normal operation of the entire HVAC system 1.

[0063] See also Figure 6 as well as Figure 8, the angle a between the tangent direction of any point on the first pipe section 141 and the horizontal line is less than or equal to 30°. When the angle a is small (less than or equal to 30°), the first pipe section 141 is almost horizontal or slightly inclined relative to the horizontal line. Since the gravity of the lubricating oil 2 is weakened, the lubricating oil 2 can adhere to the inner wall of the first pipe section 141, so the first pipe section 141 can store a certain amount of lubricating oil 2. Figure 7 as well as Fig. 9 As shown, it is more difficult to form an oil column that completely blocks the cross-section in the first pipe section 141 and the filter 12, and the gap between the lubricating oil 2 and the first pipe section 141 is larger, allowing the refrigerant to pass smoothly, ensuring the stable flow of the refrigerant in the HVAC system and avoiding the problem of unstable system pressure or reduced flow caused by blockage of the lubricating oil 2.

[0064] Furthermore, the first pipe section 141 can be a straight pipe section 1411, a curved pipe section 1412, or a combination of the straight pipe section 1411 and the curved pipe section 1412. Whether it is the straight pipe section 1411 or the curved pipe section 1412, as long as the angle a between their tangent direction and the horizontal line is less than or equal to 30°, the accumulation and accumulation of the lubricating oil 2 in the pipe section can be effectively reduced, and no further restrictions are made here. The combination design of the straight pipe section 1411 and the curved pipe section 1412 allows the outdoor heat exchanger 10 to be flexibly configured according to the actual installation environment and spatial layout of the HVAC system 1. This design makes installation more convenient and reduces installation difficulty and cost.

[0065] In some embodiments, the first pipe segment 141 is a straight pipe segment 1411, and the straight pipe segment 1411 includes at least one of a horizontal pipe segment and an inclined pipe segment, that is, the straight pipe segment 1411 can be a horizontal pipe segment, an inclined pipe segment, or a combination of a horizontal pipe segment and an inclined pipe segment.

[0066] Specifically, see Figure 1-2 , the horizontal pipe section extends in the horizontal direction; see Figure 2-3 The inclined pipe section includes at least one of a first inclined pipe section 1411a and a second inclined pipe section 1411b. Along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the first inclined pipe section 1411a extends obliquely downward, and the second inclined pipe section 1411b extends obliquely upward.

[0067] In this embodiment, the horizontal pipe section and the inclined pipe have a larger horizontal cross-sectional area than the horizontal cross-sectional area of ​​the pipe vertically distributed between the throttling assembly 30 and the filter 12 in the related art, so that the lubricating oil 2 accumulated in the horizontal pipe section and / or the inclined pipe is difficult to form an oil column that blocks the cross-section of the entire horizontal pipe section and / or the inclined pipe. The inclined pipe section may be the first inclined pipe section 1411a, or the second inclined pipe section 1411b, or the first inclined pipe section 1411a and the second inclined pipe section 1411b.

[0068] Among them, horizontal can be understood as: along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the slope of the extension direction of the horizontal pipe section is zero. Inclined can be understood as: along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the slope of the extension direction of the inclined pipe section is a fixed value, and the fixed value is not equal to zero. When the inclined pipeline includes a first inclined pipe section 1411a and a second inclined pipe section 1411b, along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the first inclined pipe section 1411a can be upstream, or the second inclined pipe section 1411b can be upstream, and no further explanation is given here.

[0069] In some other embodiments, see Figure 5 , the first pipe section 141 includes a curved pipe section 1412, wherein the curve can be understood as: along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the slope of the extending direction of the curved pipe section 1412 is a change value. The change value can change from small to large, from large to small, first from small to large and then from large to small, or first from large to small and then from small to large, etc., without limitation. The bend can also be an arc bend, etc., without limitation.

[0070] See also Figure 10-11 Specifically, the curved pipe segment 1412 includes at least one of a first curved pipe segment 1412a and a second curved pipe segment (not shown in the figure). Along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the first curved pipe segment 1412a bends downward, and the second curved pipe segment bends upward, that is, the curved pipe segment 1412 can be the first curved pipe segment 1412a, or the second curved pipe segment, or a combination of the first curved pipe segment 1412a and the second curved pipe segment. Along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the first curved pipe segment 1412a can be upstream, or the second curved pipe segment can be upstream, and no further explanation is given here.

[0071] like Fig.10, along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the first curved pipe segment 1412a extends from bottom to top, and the lowest point m at the top of the first curved pipe segment 1412a is higher than or flush with the highest point n at the bottom of the first curved pipe segment 1412a, which can be understood as: the projection of the first curved pipe segment 1412a in the first reference plane includes a relative top line segment 1413 and a bottom line segment 1414, the lowest point m of the top line segment is higher than the highest point n of the bottom line segment or the lowest point m of the top line segment and the highest point n of the bottom line segment are located on the same horizontal line; wherein the first reference plane is a vertical plane parallel to the central axis of the first curved pipe segment 1412a, which can be understood as Figure 4 The surface parallel to the paper.

[0072] Among them, when the first curved pipe segment 1412a extends from bottom to top, along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the lowest point m of the top line segment 1413 can be located at the starting point of the top line segment 1413, and the highest point n of the bottom line segment 1414 can be located at the end point of the bottom line segment 1414. In this way, the lowest point m of the top line segment 1413 and the highest point n of the bottom line segment 1414 will roughly determine the extension length of the first curved pipe segment 1412a.

[0073] Along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the second curved pipe section extends from top to bottom (not shown in the figure). Along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the second curved pipe section is similar to the first curved pipe section 1412a, and also has corresponding top line segment and bottom line segment. In this way, the lowest point of the top line segment and the highest point of the bottom line segment in the second curved pipe section will also roughly determine the extension length of the first pipe section 141.

[0074] In order to reduce the difficulty of forming the second refrigerant tube 14, along the refrigerant transmission direction, the second refrigerant tube 14 can be regarded as a pipeline with a roughly unchanged flow surface for refrigerant transmission. It can be further understood that the distance r between the top line segment 1413 and the bottom line segment 1414 in the refrigerant transmission direction remains unchanged. In this way, the difference between the lowest point m of the top line segment 1413 and the highest point n of the bottom line segment 1414 will roughly determine the amplitude of the first tube segment 141 rising from bottom to top. Specifically, if the lowest point m of the top line segment 1413 and the highest point n of the bottom line segment 1414 are located on the same horizontal plane, it can be understood that the amplitude of the first tube segment 141 rising from bottom to top is roughly equal to the spacing r between the top line segment 1413 and the bottom line segment 1414, and the spacing r between the top line segment 1413 and the bottom line segment 1414 can be roughly regarded as the inner diameter of the first tube segment 141; if the lowest point m of the top line segment 1413 is higher than the highest point n of the bottom line segment 1414, it can be understood that the amplitude of the first tube segment 141 rising from bottom to top is smaller than the spacing r between the top line segment 1413 and the bottom line segment 1414, that is, smaller than the inner diameter of the first tube segment 141.

[0075] Based on the above analysis, the tilting amplitude of the first pipe segment 141 in the embodiment of the present application is less than or equal to the inner diameter of the second refrigerant pipe 14, and the area of ​​the horizontal cross-section of the first pipe segment 141 with a smaller tilting amplitude is much larger than the area of ​​the horizontal cross-section of the pipeline vertically distributed between the throttling assembly 30 and the filter 12 in the related technology. Therefore, the lubricating oil 2 is mainly accumulated at the lower end of the first pipe segment 141 here, and it is difficult to block the horizontal cross-section of the first pipe segment 141, that is, there will be a gap between the oil column and the first pipe segment 141, and the refrigerant can flow through the gap, so that the entire HVAC system 1 establishes a stable pressure difference, which can enable the refrigerant to flush out the oil column and ensure the normal operation of the entire HVAC system 1.

[0076] It should be understood that when the first pipe segment 141 is a straight pipe segment 1411, and when the straight pipe segment 1411 is a horizontal pipe segment, it is easy to process and manufacture, which can effectively reduce costs, and the horizontal cross-sectional area of ​​the first pipe segment 141 is the largest. The lubricating oil 2 can be spread flat on the bottom of the first pipe segment 141 and will not be concentrated in a certain place, so as not to form an oil column that completely closes the entire first pipe segment 141. It can also prevent the lubricating oil 2 from clogging the first pipe segment 141 and the filter 12.

[0077] In addition, since the first pipe section 141 is a horizontal pipe section, when the HVAC system 1 switches from the heating mode to the cooling mode, the refrigerant does not need to overcome gravity when breaking open the oil column that has formed in the first pipe section 141 but has not sealed the first pipe section 141. A pressure difference can be quickly established, which helps the HVAC system 1 to enter the cooling mode faster and improve the response speed and efficiency of the HVAC system 1.

[0078] In this embodiment, see Figure 1-2 The second refrigerant pipe 14 also includes a second pipe section 142, which is used to connect the throttling assembly 30. The second pipe section 142 is connected to the first pipe section 141, and extends vertically from top to bottom along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12.

[0079] When placed vertically, the refrigerant liquid inside the throttling assembly 30 can flow naturally to avoid being trapped inside the valve body or in the pipeline. This ensures that the refrigerant circulates more smoothly in the system and improves the operating efficiency of the system.

[0080] In addition, the vertically placed throttling assembly 30 helps to reduce the gas-liquid mixing phenomenon of the refrigerant during the throttling process. The gas-liquid mixing will affect the fluidity and heat exchange efficiency of the refrigerant, and thus affect the refrigeration effect of the system. The vertical placement can reduce the occurrence of this phenomenon and make the refrigerant flow more stably in the system.

[0081] In the HVAC system 1 of this embodiment, two groups of filters 12 are provided, and are respectively located at both ends of the throttling assembly 30. The main function of the filters 12 is to remove impurities in the refrigerant, such as solid particles, moisture, oil, etc. Placing the filters 12 at both ends of the throttling assembly 30 can ensure that the refrigerant is purified by the filters 12 before entering the throttling assembly 30. This can effectively prevent impurities from entering the throttling assembly 30, reduce the blockage and wear of the throttling assembly 30, and extend its service life. Through the purification effect of the filters 12, the refrigerant can maintain a high degree of purity when flowing through the throttling assembly 30. This helps to maintain the flow performance of the throttling assembly 30, reduce the flow resistance caused by impurities, and improve the overall efficiency of the HVAC system 1.

[0082] Among them, along the refrigerant transmission direction from the second refrigerant pipe 14 to the filter 12, the length of the first pipe section 141 is greater than the length of the first refrigerant pipe 13. In this way, in an area where the installation position is limited, it is necessary to ensure that the lengths of the first pipe section 141 and the first refrigerant pipe 13 are within a certain range. When the length of the first pipe section 141 is greater than the length of the first refrigerant pipe 13, when the lubricating oil 2 and the refrigerant flow from the throttling assembly 30 to the filter 12, the longer first pipe section 141 can store more lubricating oil 2, and the lubricating oil 2 can also have a larger area spread out in the first pipe section 141, making it more difficult for the oil column to block the first pipe section 141.

[0083] In this embodiment, in the heating mode, the refrigerant flows in the direction of compressor 20--four-way valve 50--indoor heat exchanger 40--throttling component 30--outdoor heat exchanger 10--four-way valve 50--compressor 20. During this process, the surface of the outdoor heat exchanger 10 will absorb heat and frost. In order to remove the frost on the surface of the outdoor heat exchanger 10, the throttling component 30 needs to be switched from a partially open state to a fully open state during the process of the HVAC system 1 switching from the heating mode to the cooling mode to balance the pressure on both sides of the throttling component 30. However, since the throttling component 30 is in a fully open state, the throttling component 30 will be The refrigerant on the upper side of the flow component 30 flows to the lower side of the throttling component 30 under the action of gravity and pressure difference, and is filtered by the filter 12, so the oil column is mainly formed at the first pipe section 141, and basically no oil column is formed at the first refrigerant pipe 13. Therefore, after the HVAC system 1 switches from the heating mode to the cooling mode, when the compressor 20 is running, the refrigerant can easily flow through the first refrigerant pipe 13. Therefore, the first refrigerant pipe 13 can be a straight pipe extending in the horizontal direction, or an inclined straight pipe, or a curved pipe, wherein the inclination and bending have been explained above and will not be repeated here.

[0084] Furthermore, along the refrigerant transmission direction from the first refrigerant pipe 13 to the heat exchanger body 11, the inclined straight pipe may extend obliquely upward, or may extend obliquely downward, or may first extend obliquely upward and then extend obliquely downward, or may first extend obliquely downward and then extend obliquely upward; along the refrigerant transmission direction from the first refrigerant pipe 13 to the heat exchanger body 11, the curved pipe may bend downward, or may be bent upward, or may first be bent downward and then bend upward, or may first be bent upward and then bend downward, depending on the actual installation situation.

[0085] It is understandable that in some cases where installation conditions are not limited, the first refrigerant pipe 13 extends in the horizontal direction. The horizontally extending pipeline design makes the processing process more intuitive and simple, reduces the need for complex angles and bends, thereby improving production efficiency, not only facilitating the processing and production of the first refrigerant pipe 13, but also reducing the use of special processing equipment and tools, and also reducing processing costs. In addition, the horizontally arranged first refrigerant pipe 13 is conducive to the uniform distribution and flow of the refrigerant, reducing flow resistance and pressure drop, thereby improving the efficiency of the entire system.

[0086] See also Figure 1-2 In the embodiment of the present application, the extending direction of the portion of the first refrigerant pipe 13 connected to the first port 12a is the same as the direction of the opening of the first port 12a. For example, when the extending direction of the portion of the first refrigerant pipe 13 connected to the first port 12a is horizontal, the opening of the first port 12a is also oriented horizontally. Since the extending direction of the portion of the first refrigerant pipe 13 connected to the first port 12a is the same as the direction of the opening of the first port 12a, a direct and unobstructed connection of the first refrigerant pipe 13 can be achieved, reducing the adjustment and rotation steps during the installation process.

[0087] In some embodiments, the extension direction of the portion of the pipeline connecting the first pipe section 141 to the second port 12b is the same as the opening direction of the second port 12b, and can also be directly docked and installed, reducing the adjustment and rotation steps during the installation process. In addition, since the portion of the pipeline connecting the first pipe section 141 to the second port 12b is directly aligned with the second port 12b, the resistance of the fluid at the connection is reduced, allowing the refrigerant or other fluid to flow more smoothly.

[0088] The same or similar numbers in the drawings of this embodiment correspond to the same or similar items; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, it is based on the orientation or position relationship described in the drawings. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0089] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An outdoor heat exchanger, the outdoor heat exchanger is used to communicate with a throttling component in a HVAC system, characterized in that: include: Heat exchanger body; A filter having a first port and a second port; a first refrigerant pipe connected between the heat exchanger body and the first port of the filter, the first refrigerant pipe extending in a horizontal direction; The second refrigerant pipe is connected between the second port of the filter and the throttling assembly. The second refrigerant pipe includes a first pipe section connected to the second port. The first pipe section extends in a horizontal direction, or the tangent direction of any point on the first pipe section is inclined relative to the horizontal line.

2. The outdoor heat exchanger according to claim 1, characterized in that: The angle between the tangent direction of any point on the first pipe segment and the horizontal line is less than or equal to 30°.

3. The outdoor heat exchanger according to claim 1, characterized in that: The first pipe section comprises: A straight pipe segment extends along a straight direction.

4. The outdoor heat exchanger according to claim 3, characterized in that: When the first pipe segment extends in a horizontal direction, the straight pipe segment includes a horizontal pipe segment, and the horizontal pipe segment extends in a horizontal direction; or, When the tangent direction of any point on the first pipe segment is inclined relative to the horizontal line, the straight pipe segment includes an inclined pipe segment, and the inclined pipe segment includes a first inclined pipe segment, and the first inclined pipe segment extends obliquely downward along the refrigerant transmission direction from the second refrigerant pipe to the filter; or, When the tangent direction of any point on the first pipe segment is inclined relative to the horizontal line, the straight pipe segment includes an inclined pipe segment, and the inclined pipe segment includes a second inclined pipe segment, and the second inclined pipe segment extends upward along the refrigerant transmission direction from the second refrigerant pipe to the filter.

5. The outdoor heat exchanger according to claim 1, characterized in that: The first pipe section comprises: The curved pipe segment includes at least one of a first curved pipe segment and a second curved pipe segment. Along the refrigerant transmission direction from the second refrigerant pipe to the filter, the first curved pipe segment bends downward and the second curved pipe segment bends upward.

6. The outdoor heat exchanger according to claim 1, characterized in that: The second refrigerant pipe further includes: The second pipe section is used to connect the throttling assembly, the second pipe section is connected to the first pipe section, and the second pipe section extends vertically from top to bottom along the refrigerant transmission direction from the second refrigerant pipe to the filter.

7. The outdoor heat exchanger according to claim 1, characterized in that: Along the refrigerant transmission direction from the second refrigerant pipe to the filter, the length of the first pipe section is greater than the length of the first refrigerant pipe.

8. The outdoor heat exchanger according to claim 1, characterized in that: The extending direction of the portion of the first refrigerant pipe connected to the first port is the same as the opening direction of the first port; And / or, the extending direction of the portion of the pipeline of the first pipe section connected to the second port is the same as the opening direction of the second port.

9. A HVAC system, characterized in that: include: The outdoor heat exchanger according to any one of claims 1 to 8; compressor; Indoor heat exchanger; and The throttling component, the compressor, the outdoor heat exchanger, the throttling component and the indoor heat exchanger are connected in sequence.

Images