Abstract: Disclosed are a flocculant for treating fracturing flowback fluid and a preparation method therefor, which relate to oilfield sewage treatment. The method includes: in parts by weight, dissolving gelatinized starch in water, adding unsaturated polyethylene glycol, unsaturated short-chain carboxylic acid, hydroxyethyl methacrylate phosphate and an initiator under a nitrogen atmosphere for reaction for 3-8 h, and after the reaction is completed, separating and purifying to obtain a product. The flocculant for treating fracturing flowback fluid is prepared by a one-pot method, and the solvent is water, so that the preparation method is simple and has better environmental protection performance; meanwhile, the flocculant not only can reduce turbidity, color and suspended matters of the flowback fluid, but also can effectively reduce COD and total iron of the flowback fluid, and also can reduce the mineralization to a certain degree. The flocculant has good biodegradability and has less impact on the environment.

Abstract: Disclosed are a flocculant for treating fracturing flowback fluid and a preparation method therefor, which relate to oilfield sewage treatment. The method includes: in parts by weight, dissolving gelatinized starch in water, adding unsaturated polyethylene glycol, unsaturated short-chain carboxylic acid, hydroxyethyl methacrylate phosphate and an initiator under a nitrogen atmosphere for reaction for 3-8 h, and after the reaction is completed, separating and purifying to obtain a product. The flocculant for treating fracturing flowback fluid is prepared by a one-pot method, and the solvent is water, so that the preparation method is simple and has better environmental protection performance; meanwhile, the flocculant not only can reduce turbidity, color and suspended matters of the flowback fluid, but also can effectively reduce COD and total iron of the flowback fluid, and also can reduce the mineralization to a certain degree. The flocculant has good biodegradability and has less impact on the environment.

Abstract: A heat exchanger is provided. A heat exchanger includes at least two heat exchange assemblies and a connecting assembly disposed between the at least two heat exchange assemblies. Each heat exchange assembly includes a plurality of heat exchange tube units and a plurality of fin units. The plurality of fin units are separated from each other and disposed in parallel. Two ends of the heat exchange tube unit penetrate through the plurality of fin units along an axis of the heat exchange tube unit, respectively. The heat exchange tube units are distributed at intervals along a length direction of the fin unit, and adjacent two heat exchange tube units are connected and in communication with each other end to end.

Abstract: A heat exchanger (100) includes a plurality of fin units (10), a first pipeline unit (2), and a second pipeline unit (3); the plurality of fin units (10) is spaced apart from each other and arranged side by side; the first pipeline unit (2) penetrates through the fin units (10), and includes a plurality of first pipelines (201) distributed at intervals in the length direction of the fin units (10); the second pipeline unit (3) penetrates through the fin units (10); the second pipeline unit (3) and the first pipeline unit (2) are arranged at intervals in the width direction of the fin units (10); the second pipeline unit (3) includes a plurality of second pipelines (301) distributed at intervals in the length direction of the fin units (10); and the pipeline structures of the second pipelines (301) and the first pipelines (201) are different.

Abstract: A heat exchanger and an air conditioning device are provided. The heat exchanger includes a plurality of fins and a plurality of flat pipes arranged in parallel. Each of the plurality of flat pipes includes a first finned region, a second finned region, and a finless region. An end of the finless region connected to the first finned region is twisted and defined as a first torsion section, the other end of the finless region connected to the second finned region is twisted and defined as a second torsion section, and a portion of the finless region between the first torsion section and the second torsion section is defined as a connecting section.

Abstract: A fin structure applied to a microchannel heat exchanger is provided. The fin structure is configured for allowing a flat tube to penetrate. The fin structure includes a plurality of inclined sections, wherein each of the plurality of inclined sections extends from one end of the fin structure to the other end thereof. The plurality of inclined sections are sequentially connected end to end to form a wave shape, and two opposite sides of each of the inclined sections are both provided with an inclined surface.

Abstract: A heat exchanger is provided. The heat exchanger includes a connection tube, a plurality of heat exchange tubes and a plurality of connection joints, and the heat exchanger tubes and the connection joints correspond to each other one by one. Each of the plurality of the heat exchange tubes is in communication with the connection tube via a corresponding connection joint, each of the plurality of connection joints is provided with a connection port, and each of the plurality of connection joints is in communication with the connection tube via the connection port. The connection tube is provided with a distribution tube along an arrangement direction of the heat exchange tubes, the distribution tube is provided with a distribution holes matching the connection port, and the distribution hole is arranged right opposite to the connection port. An air conditioning device having the heat exchanger is further provided.

Abstract: A heat exchanger and an air conditioner are provided. The heat exchanger includes fins and flat pipes arranged in parallel. Each of the flat pipes includes a first finned region, a second finned region, and a finless region. The first finned region is the second finned region via the finless region. The fins are provided both between adjacent two first finned regions and adjacent two second finned regions. An end of the finless region connected to the first finned region is twisted and defined as a first torsion section, the other end of the finless region connected to the second finned region is twisted and defined as a second torsion section.

Abstract: A combined heat exchanger is provided. The combined heat exchanger includes at least two heat exchanger cores, a first communicating member and a second communicating member. Each of the at least two heat exchanger cores includes at least a first collecting pipe, a second collecting pipe and multiple flat pipes. The flat pipes are vertically disposed between the first collecting pipe and the second collecting pipe. Both ends of the first communicating member are in communication with the first collecting pipes of two adjacent heat exchanger cores, respectively; both ends of the second communicating member are in communication with the second collecting pipes of the two adjacent heat exchanger cores, respectively; and the two adjacent heat exchanger cores are disposed on different planes.

Abstract: A liquid distributor and a heat exchanger are provided. The liquid distributor includes a sleeve, a distribution structure, and a turbulence plate. The sleeve is in communication with heat exchange tubes. The distribution structure is located inside the sleeve and connected to the sleeve, and the distribution structure can divide the interior of the sleeve into at least a first chamber and a second chamber which are in communication with each other. The first chamber is located at a side of the distribution structure away from the heat exchange tubes, and the second chamber is located at a side of the distribution structure proximal to the heat exchange tubes. The turbulence plate is located in the second chamber, connected to the sleeve, and spaced apart from the distribution structure. The heat exchange tubes are partly inserted into the turbulence plate and are in communication with the second chamber.

Abstract: A microchannel heat exchanger group and an air conditioning system having the same are provided. The microchannel heat exchanger group includes a plurality of fins and a plurality of rows of first flat tubes and a plurality of rows of second flat tubes; the microchannel heat exchanger group includes at least a first heat exchanger and a second heat exchanger; the first heat exchanger and the second heat exchanger are independent of each other; the first heat exchanger includes the first flat tubes; the second heat exchanger includes the second flat tubes; insertion slots include first insertion slots and second insertion slots; the first flat tubes are inserted into the first insertion slots; and the second flat tubes are inserted into the second insertion slots. The air conditioning system includes the microchannel heat exchanger group.

Abstract: A fixing structure and an insertion-plate-type heat exchanger having the fixing structure are provided. The fixing structure is applied to the insertion-plate-type heat exchanger and includes a plurality of heat exchanger tubes and insertion plates, the heat exchanger tubes are inserted into the insertion plates along a direction perpendicular to an extending direction of each of the insertion plates, and the fixing structure is located on a side surface and/or an end surface of the insertion-plate-type heat exchanger. The fixing structure includes a first fixing portion and a second fixing portion connected to each other, the first fixing portion is fixedly connected to the heat exchanger tubes, and the second fixing structure is fixedly connected to an external machine. The insertion-plate-type heat exchanger includes the fixing structure.

Abstract: A heat exchanger, including: a first heat exchange portion, the first heat exchange portion including a plurality of first flat tubes disposed at intervals, each first flat tube including a first heat exchange tube section and a second heat exchange tube section connected with each other, the first heat exchange tube section and the second heat exchange tube section being disposed at a preset angle; a first manifold and a second manifold, the first heat exchange tube sections of the plurality of first flat tubes all being connected with the first manifold, and the second heat exchange tube sections of the plurality of first flat tubes being connected with the second manifold; and a second heat exchange portion, disposed at the end portion of the first heat exchange portion, the first heat exchange portion and the second heat exchange portion enclosing to form an air duct.

Abstract: Disclosed is a heat exchanger, including: at least two heat exchange tube groups—wherein each heat exchange tube group includes at least two heat exchange tubes; and a connecting member, wherein the at least two heat exchange tubes are communicated with each other by the connecting member—the at least two heat exchange tube groups are connected by the connecting member, and the at least two heat exchange tube groups are not communicated with each other.

Abstract: A heat exchanger, including: a plurality of flat pipes, wherein, the plurality of flat pipes are arranged at intervals; first sealing cushion blocks, arranged between two adjacent flat pipes, wherein the first sealing cushion blocks are located on end portions of the flat pipes, so as to seal gaps between two adjacent flat pipes by means of the first sealing cushion blocks; and a flow collecting shell, provided with a first opening portion, wherein at least part of the first sealing cushion blocks and the end portions of the flat pipes are all plugged into the first opening portion, so that the flow collecting shell, the flat pipes and the first sealing cushion blocks form a flow collecting channel in an encircling manner.

Abstract: A micro-channel heat exchanger is provided. The micro-channel heat exchanger includes a plurality of fins and a plurality of flat tubes, wherein the plurality of fins are arranged in parallel to form multiple rows, and the fins are provided with insertion slots; and the plurality of flat tubes are arranged in parallel to form multiple layers, and the flat tubes are arranged in the insertion slots in a penetrating manner. The micro-channel heat exchanger further comprises a distributor and adapter tubes, wherein the distributor is provided with a plurality of capillary tubes, one end of the adapter tube is connected to and in communication with the capillary tubes, and the other end of the adapter tube is connected to and in communication with the flat tubes.

Abstract: The present disclosure provides a flat tube and a heat exchanger, in which a bent section is formed in the middle of the flat tube, regions of the flat tube outside the bent section form two straight sections, the bent section includes a bent portion and two twisting portions, two ends of each twisting portion are connected to one end of the bent section and one straight section respectively; wherein the bent portion bends around an axis parallel to the thickness direction of the flat tube, the minimum radius of curvature of the inner side of the bent portion is RNmin, and the thickness of the flat tube is t, t<RNmin<5t.

Abstract: A heat exchanger and a microchannel heat exchanger are provided. The heat exchanger includes a plurality of heat exchange pipes arranged in sequence along a preset direction, each of the plurality of heat exchange pipes is a flat pipe and includes a first pipe segment and a second pipe segment which are connected with each other; the first pipe segments is provided with a preset bending line, and the preset bending line is perpendicular to the preset direction; an included angle is defined between a plane where a flat side of the first pipe segment is located and a plane where a corresponding flat side of the second pipe segment is located, after the plurality of first pipe segments being bent along the preset bending line, the first pipe segments of adjacent two of the heat exchange pipes are capable of being in contact with each other.

Abstract: A heat exchanger and an air conditioning device are provided. The heat exchanger includes a plurality of fins and a plurality of flat pipes arranged in parallel. Each of the plurality of flat pipes includes a first finned region, a second finned region, and a finless region. An end of the finless region connected to the first finned region is twisted and defined as a first torsion section, the other end of the finless region connected to the second finned region is twisted and defined as a second torsion section, and a portion of the finless region between the first torsion section and the second torsion section is defined as a connecting section.

Abstract: A heat exchanger and an air conditioner are provided. The heat exchanger includes fins and flat pipes arranged in parallel. Each of the flat pipes includes a first finned region, a second finned region, and a finless region. The first finned region is the second finned region via the finless region. The fins are provided both between adjacent two first finned regions and adjacent two second finned regions. An end of the finless region connected to the first finned region is twisted and defined as a first torsion section, the other end of the finless region connected to the second finned region is twisted and defined as a second torsion section.