A liquid distribution pipe assembly and air conditioner

Abstract

The present invention provides a distribution and collection pipe assembly and an air conditioner. The distribution and collection pipe assembly includes: a distribution and collection pipe and a resistance pipe. A flow channel is provided inside the distribution and collection pipe along its axial direction. A throttling channel is provided inside the resistance pipe along its axial direction. One end of the resistance pipe is inserted into the distribution and collection pipe and abuts against the inner wall of the distribution and collection pipe. A connecting hole is provided on the portion of the resistance pipe inserted into the distribution and collection pipe. The connecting hole can connect the flow channel of the distribution and collection pipe with the throttling channel of the resistance pipe. According to the present invention, an effective positioning installation can be formed between the free end of the resistance pipe and the distribution and collection pipe, and a connecting hole is provided on the portion of the resistance pipe inserted into the distribution and collection pipe, so that an effective connection can be formed between the distribution and collection pipe and the resistance pipe, and there is no need to provide a positioning convex hump or convex ring on the distribution branch pipe for installation and positioning, thereby effectively improving the production and assembly efficiency of the distribution and collection pipe assembly and solving the problem of complicated production and assembly.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration, and in particular to a liquid distribution pipe assembly and an air conditioner. Background Art

[0002] In the current steam compression refrigeration cycle, capillaries, thermal expansion valves, throttling short tubes, throttling orifice plates or electronic expansion valves are generally used as throttling and pressure-reducing elements. The low-temperature and low-pressure gas-liquid two-phase refrigerant is distributed to each branch of the evaporator in the liquid distributor (or liquid distributor). Since the two-phase flow is usually a bubble flow or a blocked flow, it is easily affected by gravity, local resistance changes, etc., causing vapor-liquid separation, thereby affecting the uniformity of refrigerant distribution between each branch. The uniform distribution mentioned here does not mean that the mass flow distribution is absolutely or relatively uniform, but whether each branch can achieve a better flow distribution according to external heat exchange conditions. The most ideal situation is that the branch with better heat exchange capacity can get more refrigerant, otherwise the refrigerant distribution is reduced. Therefore, this uniform distribution is understood with emphasis on heat exchange uniformity.

[0003] Based on the above actual conditions and requirements, the existing liquid distribution pipe assemblies usually use a multi-branch liquid distribution head to connect liquid distribution branches of different lengths, and then connect the liquid distribution branches to the flow path of the evaporator. The main part of the common liquid distribution branch is usually a soft copper tube with a small diameter, or even a capillary tube connected in series in the middle. The main principle is to increase the resistance of each branch, thereby reducing the resistance imbalance rate between each branch, and then improve the uniformity of refrigerant distribution, that is, using the large resistance distribution principle in fluid mechanics. These liquid distribution branches are usually manually adjusted in their specific directions in actual production. The winding and matching of numerous liquid distribution branches is a time-consuming and labor-intensive task, and a larger unit space is required to avoid pipeline collisions, etc. Sometimes it is even necessary to connect a plastic hose to the outside of each liquid distribution branch to avoid direct metal collisions and frictions between the liquid distribution branches.

[0004] Obviously, the existing commonly used multi-branch liquid distribution pipe / collection pipe assemblies may have the above problems. In order to solve these problems, the utility model patent 201320376410.7 embeds the diverter rod core in each diverter branch pipe, and fixes the position of the diverter rod core by using a limiting convex hull or convex ring or other groove structure on the diverter branch pipe to prevent the diverter rod core from moving inside the diverter branch pipe. Although the utility model can solve the above-mentioned existing problems, there are still some problems that have not been solved: 1) The diverter branch pipe also needs a limiting convex hull or convex ring to prevent the diverter branch pipe from being inserted too much into the flange hole; 2) The diverter rod core needs to be limited in the diverter branch pipe, resulting in the diverter branch pipe being too long, making the processing of the diverter branch pipe more complicated; 3) The diverter rod core needs to be placed in the diverter branch pipe in advance before it can be welded to the flange hole, and the production process is strict and complicated.

[0005] It is necessary to design a simpler manifold / collector assembly to achieve better refrigerant distribution uniformity while simplifying the design and improving production efficiency.

[0006] Due to the technical problems that the liquid distribution branch pipes of the liquid distribution pipe / liquid collection pipe assembly in the prior art are too long and the production and assembly are complicated; the liquid distribution head cannot completely avoid uneven liquid distribution; the liquid distribution branch pipes / liquid collection branch pipes require positioning convex hulls (or convex rings) which leads to complicated production and assembly, low production efficiency, high cost, and poor uniformity of liquid distribution / liquid collection, the present invention studies and designs a liquid distribution and collection pipe assembly and an air conditioner. Summary of the invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the distribution branch pipe of the distribution pipe / collection pipe assembly requires a positioning convex hump or convex ring to position its installation, resulting in complicated production and assembly, thereby providing a distribution and collection pipe assembly and an air conditioner.

[0008] In order to solve the above problems, the present invention provides a liquid collecting pipe assembly, which comprises:

[0009] A collecting liquid pipe and a resistance tube, wherein a flow channel is provided inside the collecting liquid pipe along its axial direction, and a throttling channel is provided inside the resistance tube along its axial direction, one end of the resistance tube is inserted into the collecting liquid pipe and abuts against the inner wall of the collecting liquid pipe, and a connecting hole is provided on the part of the resistance tube inserted into the collecting liquid pipe, and the connecting hole can connect the flow channel of the collecting liquid pipe with the throttling channel of the resistance tube.

[0010] In some embodiments, the axial direction of the connecting hole is parallel to the axial direction of the distribution and collection pipe, and the connecting hole passes through from one circumferential side of the resistance tube to the other opposite side, and the throttling channel inside the resistance tube extends along the axis of the resistance tube to connect with the connecting hole.

[0011] In some embodiments, the axis of the connecting hole coincides with the axis of the collecting pipe, so that the connecting hole is located at the central axis of the collecting pipe; and / or the axial direction of the resistance tube forms an angle α with the axial direction of the collecting pipe, and 0<α≤90°.

[0012] In some embodiments, the resistance tube can have its length or the inner diameter of the throttling channel changed according to the heat exchange capacity at different positions.

[0013] In some embodiments, there are multiple resistance tubes, and the multiple resistance tubes are spaced apart along the length direction of the distribution and collection tube. The multiple resistance tubes include a first resistance tube and a second resistance tube. The first resistance tube can be connected to the first heat exchange tube, and the second resistance tube can be connected to the second heat exchange tube. The heat exchange demand of the first heat exchange tube is greater than the heat exchange demand of the second heat exchange tube, and the throttling degree of the first resistance tube is less than the throttling degree of the second resistance tube.

[0014] In some embodiments, the length of the first resistance tube is smaller than the length of the second resistance tube, and / or the diameter of the throttling channel of the first resistance tube is larger than the diameter of the throttling channel of the second resistance tube.

[0015] In some embodiments, the resistance tube includes a first tube segment and a second tube segment, the first tube segment is connected to the second tube segment, at least a portion of the first tube segment is inserted into the interior of the distribution and collection tube, the free end of the first tube segment abuts against the inner wall of the distribution and collection tube, at least a portion of the second tube segment extends out of the distribution and collection tube, and the outer diameter of the first tube segment is greater than the outer diameter of the second tube segment, so as to form a step at the connection position between the first tube segment and the second tube segment.

[0016] In some embodiments, the length of the first pipe segment is L1, the total length of the resistance tube is L2, and the length of the second pipe segment is L2-L1. The diameter of the throttling channel is d, the outer diameter of the first pipe segment is M, and the outer diameter of the second pipe segment is D.

[0017] In some embodiments, a liquid collecting branch pipe is further included, which is sleeved on the outer circumference of at least a portion of the second pipe segment, and one end of the liquid collecting branch pipe is abutted against the step, and the first pipe segment is entirely located inside the liquid collecting pipe, and at least a portion of the liquid collecting branch pipe is also located inside the liquid collecting pipe.

[0018] In some embodiments, the outer diameter of the liquid distribution branch pipe is equal to the outer diameter of the first pipe segment; and / or, when the length of the first pipe segment is L1 and the total length of the resistance tube is L2, the axial length of the liquid distribution branch pipe is H, and L2-L1≤H.

[0019] In some embodiments, the resistance tube is an integrated resistance tube, the end of the first tube segment connected to the second tube segment extends to the outside of the distribution and collection pipe, and the second tube segment is entirely located outside the distribution and collection pipe.

[0020] In some embodiments, the inner diameter of the liquid collecting pipe is N, the length of the portion of the liquid collecting branch pipe located inside the liquid collecting pipe is h,

[0021] The present invention also provides an air conditioner, which comprises the liquid collecting pipe assembly as described in any of the preceding items.

[0022] The present invention provides a liquid distribution pipe assembly and an air conditioner having the following beneficial effects:

[0023] 1. The present invention provides a liquid collecting pipe and a resistance pipe. The liquid collecting pipe is a main pipe of the liquid collecting pipe or a main pipe of the liquid collecting pipe, which can branch and connect multiple branch pipes. The resistance pipes of the present invention are respectively connected with their branch connecting ports to guide the liquid collecting pipe to multiple resistance pipes or guide multiple resistance pipes back to the liquid collecting pipe for merging. A throttling channel is provided inside the resistance pipe, which can make the fluid play a throttling role in the resistance pipe and increase the resistance of the fluid. One end of the resistance pipe of the present invention is inserted into the liquid collecting pipe and abuts against the inner wall of the liquid collecting pipe, so that an effective positioning installation can be formed between the free end of the resistance pipe and the liquid collecting pipe, and the insertion of the resistance pipe A connecting hole is provided in the part entering the liquid collecting pipe, so that an effective connection can be formed between the liquid collecting pipe and the resistance pipe. There is no need to provide a positioning convex hump or convex ring on the liquid collecting branch pipe for installation and positioning, thereby effectively improving the production and assembly efficiency of the liquid collecting pipe assembly and solving the problem of complicated production and assembly. Preferably, the resistance tube of the present invention is provided with at least a two-section structure, which can form an effective positioning effect on the liquid collecting branch pipe through the step position between the two sections. The liquid collecting branch pipe only needs to be provided as a straight pipe, further avoiding the provision of a positioning convex hump or convex ring structure. The liquid collecting branch pipe is sleeved onto the resistance tube, and then integrally plugged into the flange hole, and then welded at the flange hole.

[0024] 2. The present invention can also change the length or the inner diameter of the throttling channel of the resistance tube according to the size of the heat exchange capacity at different positions, and can adjust its length and / or inner diameter as needed (resistance tubes of different lengths and / or inner diameters are set for heat exchange tubes at different positions), thereby adjusting the resistance imbalance rate between each branch and improving the liquid separation uniformity of the pipeline. Resistance tubes of different lengths can penetrate into the heat exchange tubes of the heat exchanger, thereby improving the liquid separation / liquid collection uniformity of the refrigeration system (the uniformity here is relative uniformity, that is, the length and / or inner diameter of the resistance tube with a matching throttling degree can be provided according to different heat exchange requirements or heat exchange conditions), without affecting the assembly of the liquid separation tube / liquid collection tube assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front structural schematic diagram of the liquid collecting pipe assembly of the present invention;

[0026] Figure 2 It is a partial cross-sectional view of the connection position between the liquid collecting pipe and the resistance pipe of Example 1 of the present invention;

[0027] Figure 3 for Figure 2 Left side cross-sectional view;

[0028] Figure 4 for Figure 3 Dimensional structure diagram of the resistance tube;

[0029] Figure 5 for Figure 2 The structural diagram of the branch pipe of the distribution liquid;

[0030] Figure 6 It is a cross-sectional view of the resistance tube of Example 2 of the present invention.

[0031] The reference numerals are:

[0032] 1. Liquid distribution pipe; 11. Circulation channel; 2. Resistance tube; 21. Throttling channel; 22. Connecting hole; 23. First pipe section; 24. Second pipe section; 25. Step; 3. Liquid distribution branch pipe; 4. Pipe mouth sealing cap. DETAILED DESCRIPTION

[0033] like Figure 1-6 The present invention provides a liquid collecting pipe assembly, which comprises:

[0034] A collecting liquid pipe 1 and a resistance tube 2, wherein the collecting liquid pipe 1 is provided with a flow channel 11 inside along its axial direction, and the resistance tube 2 is provided with a throttling channel 21 inside along its axial direction, one end of the resistance tube 2 is inserted into the collecting liquid pipe 1 and abuts against the inner wall of the collecting liquid pipe 1, and the part of the resistance tube 2 inserted into the collecting liquid pipe is provided with a connecting hole 22, and the connecting hole 22 can connect the flow channel 11 of the collecting liquid pipe 1 with the throttling channel 21 of the resistance tube.

[0035] The present invention provides a distribution and collection pipe and a resistance pipe. The distribution and collection pipe is the main pipe of the distribution pipe or the main pipe of the collection pipe, which can branch and connect multiple branch pipes. The resistance pipe of the present invention is respectively connected with its branch connecting port to guide the distribution and collection pipe into multiple resistance pipes or guide the multiple resistance pipes back to the collection pipe for convergence. A throttling channel is provided inside the resistance pipe, which can make the fluid play a throttling role in the resistance pipe and increase the resistance of the fluid. One end of the resistance pipe of the present invention is inserted into the distribution and collection pipe and abuts against the inner wall of the distribution and collection pipe, and an effective positioning installation can be formed between the free end of the resistance pipe and the distribution and collection pipe. A connecting hole is provided through the part of the resistance pipe inserted into the distribution and collection pipe, so that an effective connection can be formed between the distribution and collection pipe and the resistance pipe, and there is no need to provide a positioning convex hump or convex ring on the distribution branch pipe for installation and positioning, thereby effectively improving the production and assembly efficiency of the distribution and collection pipe assembly and solving the problem of complicated production and assembly.

[0036] like Figure 1 As shown, the liquid pipe assembly can be a liquid distribution pipe assembly or a liquid collection pipe assembly. In a heat pump type refrigeration system, the functions of the two often change. For example, when cooling, its function is a liquid distribution pipe assembly, and when heating, its function is converted into a liquid collection pipe assembly. Therefore, the liquid distribution and collection pipe assembly of the present invention can be a liquid distribution pipe or a liquid collection pipe. The subsequent liquid distribution pipe is the liquid distribution and collection pipe of the present invention, and the liquid distribution branch pipe is the liquid distribution and collection branch pipe of the present invention.

[0037] There are multiple outward flanged holes on the distribution liquid pipe with an aperture of M. The directions of these flanged holes are usually consistent and the specifications are also the same. A pipe mouth sealing cap is welded at one end of the distribution liquid pipe, and the other end is an inlet and outlet or is also welded with a pipe mouth sealing cap. When pipe mouth sealing caps are welded at both ends of the distribution liquid pipe, an inlet and outlet are connected to a certain position in the middle of the distribution liquid pipe. Because the specific structure of the distribution liquid pipe is not the focus of the present invention, it will not be described in detail.

[0038] The outer diameter of the liquid collecting branch pipe is M, the inner diameter is D, and the length is H. Usually, a positioning convex hull or convex ring (existing structure) is processed near one end of the liquid collecting branch pipe, which can be positioned when inserted into the flange hole of the liquid collecting pipe to prevent the insertion depth of the liquid collecting branch pipe from being uncontrollable. After the liquid collecting branch pipe is inserted into the liquid collecting pipe and positioned, it is welded to form the currently common gas collecting pipe / gas collecting pipe assembly, which can basically not be used for liquid separation or liquid collection because the liquid separation uniformity of this assembly is very poor.

[0039] In actual matching and use, the required refrigerant distribution amount of each branch of the heat exchanger is obtained according to simulation or experimental test, so as to determine the length L2 of the resistance tube required for each liquid distribution branch. For example, the length of one of the largest resistance tubes is used as the reference L2, and the other resistance tubes with smaller resistance are shortened by cutting the original uniform length L2 as needed to obtain the required resistance characteristics, and then each resistance tube is inserted into the liquid distribution branch. Figure 1 As shown in the partial cross-sectional view, after the tail of the resistance tube is inserted into the distribution liquid branch pipe, the step effect is limited, so the large resistance tube and the distribution liquid branch pipe are combined into a combination with an outer diameter of M, and the head side of the combination (the cylindrical side of the large resistance tube head) is inserted into the flange hole of the distribution liquid pipe. The head reaches the bottom of the inner diameter of the distribution liquid pipe and is automatically limited.

[0040] The present invention uses a large resistance tube with a limiting step to position the liquid distribution and collection branch pipes, and uses a large resistance channel to balance the resistance imbalance rate between each branch, thereby providing liquid distribution / liquid collection uniformity of the refrigeration system, and the beneficial effects are as follows:

[0041] 1) The liquid distribution pipe / liquid collection pipe assembly eliminates the complicated liquid distribution and collection branch pipes and liquid distribution heads, improves production efficiency and reduces costs;

[0042] 2) The step structure of the large resistance tube is used to position the liquid distribution branch pipe. The liquid distribution branch pipe does not need to be positioned with a convex hull (or convex ring), so only a straight tube design is required; the stepped large resistance tube can be adjusted in length as needed, thereby adjusting the resistance imbalance rate between each branch and improving the liquid distribution uniformity of the pipeline. The large resistance tubes of different lengths can penetrate deep into the heat exchange tubes of the heat exchanger without affecting the assembly of the liquid distribution tube / liquid collection tube assembly;

[0043] 3) The stepped large resistance pipe is combined with the distribution and collection branch pipe to achieve self-limiting between each other. The distribution and collection branch pipe only needs to be a straight pipe, without the need to design a positioning convex package (or convex ring). The distribution and collection branch pipe is put on the large resistance pipe, and then inserted into the flange hole as a whole, and then welded at the flange hole;

[0044] 4) The length of the large resistance tube can be adjusted as needed, so as to adjust the resistance imbalance rate between each branch and improve the liquid separation / collection uniformity of the refrigeration system.

[0045] In some embodiments, the axial direction of the connecting hole 22 is parallel to the axial direction of the collecting pipe 1, and the connecting hole 22 penetrates from one circumferential side of the resistance pipe 2 to the other opposite side, and the throttling channel 21 inside the resistance pipe 2 extends along the axis of the resistance pipe 2 to communicate with the connecting hole 22. This is a preferred structural form of the connecting hole of the present invention, and its axial direction is parallel to the axis of the collecting pipe. Since the internal flow direction of the collecting pipe is along the axial direction when the collecting pipe is used as a liquid collecting pipe, the liquid can enter the connecting hole from the flow direction of the collecting pipe and enter the throttling channel, thereby reducing the bending resistance of the liquid.

[0046] In some embodiments, the axis of the communication hole 22 coincides with the axis of the collecting and collecting pipe 1, so that the communication hole 22 is located at the central axis of the collecting and collecting pipe 1; and / or,

[0047] The axial direction of the resistance tube 2 forms an angle α with the axial direction of the liquid distribution pipe 1, and 0<α≤90°.

[0048] In the present invention, the axis of the connecting hole 22 coincides with the axis of the collecting pipe 1, so that the connecting hole is located at the central axis of the collecting pipe. Since the flow rate of the fluid at this position is the largest, the flow rate of the liquid entering the connecting hole and the throttling channel can be effectively guaranteed to reach the maximum, thereby improving the heat exchange capacity; the axis direction of the resistance tube forms an angle between 0 and 90 degrees with the axis direction of the collecting pipe, such as Figure 1-2 As shown, it is 90 degrees, so it can bend and guide the airflow and introduce it into multiple different resistance tubes to achieve diversion, or introduce the fluid in multiple resistance tubes into the distribution and collection tube to achieve convergence.

[0049] Try to ensure that the hollow channel with an inner diameter of P is coaxial with the collecting pipe (for example, a line is carved on the end face of the large resistance pipe at the end, which is parallel to the axis of the hollow channel with an inner diameter of P, which can be used as a mark to determine whether the hollow channel with an inner diameter of P is coaxial with the collecting pipe). The hollow channel with an inner diameter of P is mainly used to reduce the resistance of fluid in and out, because the inlet end face of the hollow channel with an inner diameter of d is too close to the wall of the inner diameter of the collecting pipe, and the fluid flow resistance at this end face is uncontrollable. Therefore, the fluid flow rate of the orifice here is minimized, and most of the fluid is allowed to enter and exit through the hollow channel with an inner diameter of P.

[0050] In some embodiments, the resistance tube 2 can change its length or the inner diameter of the throttling channel 21 according to the size of the heat exchange capacity at different positions. The present invention also allows the resistance tube to change its length or the inner diameter of the throttling channel according to the size of the heat exchange capacity at different positions, and can adjust its length and / or inner diameter as needed (resistance tubes of different lengths and / or inner diameters are set for heat exchange tubes at different positions), thereby adjusting the resistance imbalance rate between each branch, improving the liquid separation uniformity of the pipeline, and large resistance tubes of different lengths can penetrate into the heat exchange tubes of the heat exchanger, thereby improving the liquid separation / liquid collection uniformity of the refrigeration system (the uniformity here is relative uniformity, that is, the length and / or inner diameter of the resistance tube with a matching throttling degree can be provided according to different heat exchange requirements or heat exchange conditions), without affecting the assembly of the liquid separation tube / liquid collection tube assembly.

[0051] In some embodiments, there are multiple resistance tubes 2, and the multiple resistance tubes 2 are spaced apart along the length direction of the distribution and collection liquid tube 1. The multiple resistance tubes 2 include a first resistance tube and a second resistance tube. The first resistance tube can be connected to the first heat exchange tube, and the second resistance tube can be connected to the second heat exchange tube. The heat exchange demand of the first heat exchange tube is greater than the heat exchange demand of the second heat exchange tube, and the throttling degree of the first resistance tube is less than the throttling degree of the second resistance tube. This is the preferred configuration of the multiple resistance tubes of the present invention, that is, for heat exchange tubes with large heat exchange demand, resistance tubes with smaller throttling degree should be connected, so as to ensure that the flow rate is larger and the flow rate entering the heat exchange tube for heat exchange is larger to improve the heat exchange capacity. Heat exchange tubes with small heat exchange demand are connected to resistance tubes with larger throttling degree to reduce their flow rate and reduce their heat exchange capacity. It can be achieved to make selections according to different heat exchange demands to improve heat exchange uniformity and improve the efficiency of the refrigeration system.

[0052] In some embodiments, the length of the first resistance tube is smaller than the length of the second resistance tube, and / or the diameter of the throttling channel of the first resistance tube is larger than the diameter of the throttling channel of the second resistance tube. The present invention further adjusts different throttling degrees by adjusting the different lengths and diameters of the resistance tubes. The length of the first resistance tube is smaller than that of the second resistance tube, so the throttling degree of the first resistance tube is smaller, and the flow rate flowing through it is larger, which is suitable for heat exchange tubes with greater heat exchange requirements. The diameter of the throttling channel of the first resistance tube is larger than that of the second resistance tube, so the throttling degree of the first resistance tube is smaller, and the flow rate flowing through it is larger, which is suitable for heat exchange tubes with greater heat exchange requirements. It can be selected according to different heat exchange requirements to improve heat exchange uniformity and improve the efficiency of the refrigeration system.

[0053] The present invention provides a high resistance tube structure, similar to a throttling short tube or a diverting capillary tube, such as Figure 1The large resistance tube shown is a stepped hollow cylinder with a total length of L2. The length of the stepped cylinder at the head is L1 and the outer diameter is M. The length of the tail cylinder can be calculated to be L2-L1, and the outer diameter of the tail cylinder is D. The head and tail cylinders are coaxial and the inner diameter of the hollow channel is d. There is another hollow channel with an inner diameter of P at the head cylinder that intersects the hollow channel vertically. In the same liquid pipe assembly, the length L2 of the large resistance tube is a variable part, that is, L2-L1 is a variable part, and other design parameters are usually fixed, so as to adjust the resistance characteristics of the large resistance tube itself, so as to balance the imbalance rate between each liquid distribution branch pipe and enhance the uniformity of liquid separation; of course, changing the size of the inner diameter d of the hollow channel at the same time can also change the resistance characteristics of the large resistance tube itself. The usual practice is to change L2 first, and then change d.

[0054] In some embodiments, the resistance tube 2 includes a first tube section 23 and a second tube section 24, the first tube section 23 is connected to the second tube section 24, at least part of the first tube section 23 is inserted into the interior of the collecting tube 1, the free end of the first tube section 23 abuts against the inner wall of the collecting tube 1, at least part of the second tube section 24 extends out of the collecting tube 1, the outer diameter of the first tube section 23 is greater than the outer diameter of the second tube section 24, so as to form a step 25 at the connection position between the first tube section 23 and the second tube section 24. The resistance tube of the present invention is set to at least a two-section structure, which can effectively position the collecting tube branch through the step position between the two sections. The collecting tube branch only needs to be set to a straight tube, further avoiding the setting of a positioning convex hump or convex ring structure. The collecting tube branch is put on the large resistance tube, and then inserted into the flange hole as a whole, and then welded at the flange hole.

[0055] In some embodiments, the length of the first pipe segment 23 is L1, the total length of the resistance tube 2 is L2, the length of the second pipe segment 24 is L2-L1, the diameter of the throttling channel 21 is d, the outer diameter of the first pipe segment 23 is M, and the outer diameter of the second pipe segment 24 is D. These are the sizes of different pipe segments, as well as the outer diameters of different pipe segments and the inner diameters of the throttling channels of the present invention.

[0056] Embodiment 1, as Figure 1-5In some embodiments, it further includes a liquid collecting branch pipe 3, which is sleeved on the outer circumference of at least part of the second pipe segment 24, and one end of the liquid collecting branch pipe 3 abuts against the step 25, and the first pipe segment 23 is entirely located inside the liquid collecting pipe 1, and at least part of the liquid collecting branch pipe 3 is also located inside the liquid collecting pipe 1. The present invention, through the provision of the liquid collecting branch pipe, can lead out the liquid collecting port of the liquid collecting pipe, introduce the fluid into the heat exchange tube for heat exchange, or guide the heat exchange tube back to the liquid collecting pipe through the liquid collecting branch pipe; and the liquid collecting branch pipe abuts against the step of the segmented resistance tube, which can form an effective positioning effect on the liquid collecting branch pipe, effectively avoid the provision of structures such as convex hulls or convex rings, improve assembly efficiency and reduce production difficulty.

[0057] In some embodiments, the outer diameter of the liquid collecting branch pipe 3 is equal to the outer diameter of the first pipe section 23; and / or, when the length of the first pipe section 23 is L1 and the total length of the resistance tube 2 is L2, the axial length of the liquid collecting branch pipe 3 is H, and L2-L1≤H. After the length of some large resistance tubes is adjusted, the end face of the tail with an outer diameter of D may not necessarily extend out of the end face of the liquid collecting branch pipe, that is, the length L2-L1≤H may exist, and it is even possible that the tail cylindrical length of all large resistance tubes is L2-L1≤H. (That is, L2-L1≤H can also be>H). This can effectively ensure that the fluid in the liquid collecting tube continues to be guided to the heat exchange tube through the liquid collecting branch pipe, or the fluid in the heat exchange tube is guided back to the liquid collecting tube.

[0058] Embodiment 2, as Figure 6 In some embodiments, the resistance tube 2 is an integrated resistance tube, and the end of the first tube section 23 connected to the second tube section 24 extends to the outside of the collecting liquid tube 1, and the second tube section 24 is entirely located outside the collecting liquid tube 1. This is the structural form of Example 2 of the present invention, that is, no collecting liquid branch pipe is provided, and the effective connection between the collecting liquid tube and the heat exchange tube is achieved only through the resistance tube, and the throttling and pressure reduction effect of the fluid can also be formed.

[0059] An alternative solution is to use an integrated large resistance tube design structure to replace the combined structure of "large resistance tube + distribution branch pipe", such as Figure 1 As shown, most of the design parameters of the integrated large resistance tube are the same as those of the original large resistance tube. What needs to be controlled is the length L2-L1-H of the tail cylinder with a diameter of D, and the length of the head cylinder with an outer diameter of M is L1+H, which is the minimum total length of the large resistance tube. That is, according to design requirements, the length L1+H (without tail cylinder) is used for the minimum resistance characteristic, and the tail cylinder length L2-L1-H required for other larger resistance characteristics is cut according to needs.

[0060] In some embodiments, the inner diameter of the liquid collecting pipe 1 is N, the length of the portion of the liquid collecting branch pipe 3 located inside the liquid collecting pipe 1 is h,

[0061] According to the inner diameter N of the liquid collecting pipe, the inner diameter M of the flange hole (the outer diameter M of the combination), and the length L1 of the head of the large resistance pipe, it can be calculated that the depth of the head step section of the large resistance pipe, that is, the end face of the liquid collecting branch pipe inserted into the inner diameter of the liquid collecting pipe is This size only needs to meet the insertion depth requirement of the welding process of the liquid collecting branch pipe. Therefore, in the design stage, the length L1 of the cylinder at the head of the large resistance pipe can be calculated by the inner diameter N of the liquid collecting pipe, the outer diameter M of the flange hole (i.e., the liquid collecting branch pipe), and the insertion depth h of the welding process.

[0062] It should be noted that the dimensional tolerances between the various matching dimensions of the components, especially the matching between the apertures, require certain processing tolerances. Although not specifically mentioned here, it does not mean that the tolerance range of certain dimensions does not need to be limited according to the production process. For example, the flanging hole usually adopts an upper deviation of 0.10 to 0.20 mm to ensure that the distribution liquid branch pipe with an outer diameter of M can be smoothly inserted into the flanging hole, and at the same time ensure that the molten solder during welding can smoothly penetrate the welding gap, thereby ensuring the welding strength.

[0063] The outer diameter of the distribution branch pipe and the heat exchange tube of the heat exchanger is usually the same, while the inner diameter of the distribution branch pipe is usually smaller than the inner diameter of the heat exchange tube (because the wall thickness of the heat exchange tube is usually smaller, and the wall thickness of the distribution branch pipe as a connecting pipe is larger), that is, the outer diameter D of the tail of the large resistance tube is usually smaller than the inner diameter of the heat exchange tube. The inlet and outlet of the heat exchanger branch are usually flared sections, so the distribution branch pipe can be automatically limited after being inserted into the flared section, and the tail of the large resistance tube can be smoothly inserted into the flared section of the heat exchanger and then enter the interior of the heat exchange tube, which will not affect the insertion depth of the distribution branch pipe. The insertion of the distribution branch pipe into the flared section of the heat exchange tube is a mature design and production process, which will not be described in detail here.

[0064] Figure 1 In the liquid pipe assembly, the length of the large resistance pipe at each location is only a schematic diagram, and the text labels are not all marked. The lack of marking of the distribution liquid branch pipe does not mean that there is no matching large resistance pipe.

[0065] It should be specially noted that the present invention application mainly uses the liquid distribution and collection pipe assembly as an embodiment for description, but is also applicable to pipeline assemblies with similar functions such as liquid collection pipe assemblies, gas distribution pipe assemblies and gas collection pipe assemblies.

[0066] The present invention also provides an air conditioner, which comprises the liquid collecting pipe assembly as described in any of the preceding items.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A liquid distribution pipe assembly, characterized in that: include: A collecting liquid pipe (1) and a resistance tube (2), wherein the collecting liquid pipe (1) is provided with a flow channel (11) inside along its axial direction, and the resistance tube (2) is provided with a throttling channel (21) inside along its axial direction, one end of the resistance tube (2) is inserted into the collecting liquid pipe (1) and abuts against the inner wall of the collecting liquid pipe (1), and the part of the resistance tube (2) inserted into the collecting liquid pipe is provided with a connecting hole (22), and the connecting hole (22) can connect the flow channel (11) of the collecting liquid pipe (1) with the throttling channel (21) of the resistance tube.

2. The liquid collecting pipe assembly according to claim 1, characterized in that: The axial direction of the connecting hole (22) is parallel to the axial direction of the collecting liquid pipe (1), and the connecting hole (22) penetrates from one circumferential side of the resistance tube (2) to the other opposite side, and the throttling channel (21) inside the resistance tube (2) extends along the axis of the resistance tube (2) until it is connected with the connecting hole (22).

3. The liquid collecting pipe assembly according to claim 2, characterized in that: The axis of the communication hole (22) coincides with the axis of the liquid collecting pipe (1), so that the communication hole (22) is located at the central axis of the liquid collecting pipe (1); and / or, The axial direction of the resistance tube (2) forms an angle α with the axial direction of the liquid collecting tube (1), and 0<α≤90°.

4. The liquid collecting pipe assembly according to any one of claims 1 to 3, characterized in that: The resistance tube (2) can have its length or the inner diameter of the throttling channel (21) changed according to the heat exchange capacity at different positions.

5. The liquid collecting pipe assembly according to claim 4, characterized in that: There are a plurality of resistance tubes (2), and the plurality of resistance tubes (2) are arranged at intervals along the length direction of the distribution and collection liquid tube (1). The plurality of resistance tubes (2) include a first resistance tube and a second resistance tube. The first resistance tube can be connected to a first heat exchange tube, and the second resistance tube can be connected to a second heat exchange tube. The heat exchange demand of the first heat exchange tube is greater than the heat exchange demand of the second heat exchange tube, and the throttling degree of the first resistance tube is less than the throttling degree of the second resistance tube.

6. The liquid collecting pipe assembly according to claim 5, characterized in that: The length of the first resistance tube is shorter than the length of the second resistance tube, and / or the diameter of the throttling passage of the first resistance tube is larger than the diameter of the throttling passage of the second resistance tube.

7. The liquid collecting pipe assembly according to any one of claims 1 to 3, characterized in that: The resistance tube (2) comprises a first tube section (23) and a second tube section (24); the first tube section (23) is connected to the second tube section (24); at least part of the first tube section (23) is inserted into the interior of the liquid collecting tube (1); the free end of the first tube section (23) abuts against the inner wall of the liquid collecting tube (1); at least part of the second tube section (24) extends out of the liquid collecting tube (1); the outer diameter of the first tube section (23) is greater than the outer diameter of the second tube section (24), so as to form a step (25) at the connection position between the first tube section (23) and the second tube section (24).

8. The liquid collecting pipe assembly according to claim 7, characterized in that: The length of the first pipe section (23) is L1, the total length of the resistance tube (2) is L2, the length of the second pipe section (24) is L2-L1, the diameter of the throttling channel (21) is d, the outer diameter of the first pipe section (23) is M, and the outer diameter of the second pipe section (24) is D.

9. The liquid collecting pipe assembly according to claim 7, characterized in that: It also comprises a liquid collecting branch pipe (3), which is sleeved on the outer circumference of at least part of the second pipe section (24), and one end of the liquid collecting branch pipe (3) is in contact with the step (25), and the first pipe section (23) is entirely located inside the liquid collecting pipe (1), and at least part of the liquid collecting branch pipe (3) is also located inside the liquid collecting pipe (1).

10. The liquid collecting pipe assembly according to claim 9, characterized in that: The outer diameter of the liquid distribution branch pipe (3) is equal to the outer diameter of the first pipe section (23); and / or, when the length of the first pipe section (23) is L1 and the total length of the resistance tube (2) is L2, the axial length of the liquid distribution branch pipe (3) is H, and L2-L1≤H.

11. The liquid collecting pipe assembly according to claim 7, characterized in that: The resistance tube (2) is an integrated resistance tube, and the end of the first tube section (23) connected to the second tube section (24) extends to the outside of the liquid collecting tube (1), and the second tube section (24) is entirely located outside the liquid collecting tube (1).

12. The liquid collecting pipe assembly according to claim 9, characterized in that: The inner diameter of the liquid collecting pipe (1) is N, the length of the partial pipe section of the liquid collecting branch pipe (3) located inside the liquid collecting pipe (1) is h, 13. An air conditioner, characterized in that: The invention comprises the liquid collecting pipe assembly according to any one of claims 1 to 12.

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