Patent Description:
The plate-fin type heat exchanger is generally composed of plates and fins. A fluid passage is formed after the fin is placed between two adjacent plates. Multiple plates are stacked in different ways according to the actual needs, and are brazed into a whole to form a plate bundle. The plate-fin type heat exchanger is formed by assembling the plate bundle with corresponding sealing plugs, connecting pipes, support members and other parts.

Compared with the conventional heat exchanger, the plate-fin type heat exchanger has a secondary surface and a very compact structure. The turbulence of the fins to fluid causes the boundary layer of fluid to break continuously. Moreover, due to the high thermal conductivity of the plates and the fins, the plate-fin type heat exchanger has high efficiency.

The fins can improve the flow turbulence of fluid, but also have the disadvantages of high flow resistance and low pressure resistance. Therefore, the plate-fin type heat exchanger is hardly suitable for heat exchange between low-pressure fluid and high-pressure fluid. Document <CIT> discloses a heat exchanger including a plurality of cup plates that are formed such that a first layered space into which a first heat carrier is introduced and a second layered space into which a second heat carrier is introduced are formed alternately between the plurality of cup plates when the plurality of plates are stacked. Peripheral end portions of the plurality of cup plates are fixed together in a liquid-tight manner. A distance in a stacking direction from a first cup plate that forms the first layered space to a second cup plate that forms the second layered space and a distance in the stacking direction from the second cup plate to the first cup plate are set to different distances, and end portions of outer wall portions of the cup plates are bent back so as to be apart from each other when the cup plates are stacked. Document <CIT> discloses a heat exchanger including: a core including a plurality of core plates, first and second passages, and a vertical passage; a base plate including a passage port; and a distance plate; wherein the first vertical passage and the passage port are arranged apart from each other in a direction orthogonal to a stacking direction of the core plates, and wherein the distance plate includes a bottom wall part and a swelling part, the bottom wall part being a thin plate-shaped and being joined to an upper surface of the base plate, the swelling part swelling up in the stacking direction from the bottom wall part so as to surround a circumference of a communication passage which communicates the first vertical passage with the passage port and being joined to a lowermost surface of the core in a flange part of a tip of the swelling part. Document <CIT> discloses a heat exchanger, wherein a pair of projections is juxtaposed on a first plate, and the projection heights thereof are aligned to the height of the first flow path. At positions away from the projections many dimples are distributed and protruded on a second plate, and the heights thereof are equalized to the height of the first flow path. The projections and respective depressed fitting parts on a back side of the dimples are on the second flow path side, and an inner fin is interposed in the second flow path. Document <CIT> discloses a plate heat exchanger comprising a plurality of heat exchanger plates stacked one above the other. The plates each have a peripheral edge projecting from its plate plane. The heat exchanger plates succeeding one another in each case are sealingly connected at their edges, so that flow ducts for at least two heat exchange media form between the plates. Each of these flow ducts is connected via openings in the heat exchanger plates to at least one other flow duct, so that a first heat exchange medium can flow through a first group of ducts loaded in parallel and a second heat exchange medium can flow through another group. So that a heat exchanger constructed in this way offers a satisfactory heat transmission capacity even in the case of widely varying volume flows of the media involved, the openings for the first heat exchange medium have a substantially larger cross section than the openings for the second heat exchange medium.

In order to solve the above technical problem, a heat exchanger is provided according to the present application, which includes a heat exchange core. The heat exchange core includes multiple first plates, multiple second plates and fins. The first plate includes a first plate surface, multiple protrusions protruding from the first plate surface, and a second plate surface opposite to the first plate surface. The second plate includes a first plate surface and a second plate surface opposite to the first plate surface. A first fluid passage and a second fluid passage isolated from each other are formed in the heat exchange core. The fin is arranged between the second plate surface of the first plate and the first plate surface of the second plate, and the protrusions are located between the first plate surface of the first plate and the second plate surface of the adjacent second plate. A first passage is formed between the second plate surface of the first plate and the first plate surface of the second plate, and the first passage is part of the first fluid passage. A second passage is formed between the first plate surface of the first plate and the second plate surface of the second plate, and the second passage is part of the second fluid passage. The first plate further comprises a first corner hole portion and a second corner hole portion recessed into the first plate surface, a third corner hole portion and a fourth corner hole portion protruding from the first plate surface, and a first recess and a second recess recessed into the first plate surface. Protruding structures corresponding to the first recess and the second recess of the first plate are provided on a second plate surface side of the first plate, the first recess of the first plate is connected with the second recess. Two end portions of the first recess of the first plate are wider than a middle portion of the first recess, and the two end portions of the first recess of the first plate are wider than the second recess.

The provided heat exchanger includes the first plate and the second plate, multiple protrusions are provided on the first plate surface of the first plate, the fin is provided between the second plate surface of the first plate and the first plate surface of the adjacent second plate, and turbulent flow between a side of the first plate provided with the protrusions and the second plate surface of the adjacent second plate is realized by the multiple protrusions. The heat exchanger improves the flow turbulence in the first fluid passage by the fins, and improves the flow turbulence in the second fluid passage by the multiple protrusion structures, so that low-pressure fluid can flow through the first fluid passage, and high-pressure fluid can flow through the second fluid passage.

Specific embodiments of the present application will be illustrated hereinafter in conjunction with accompanying drawings.

<FIG> is a schematic perspective view of an embodiment of a heat exchanger according to the present application. <FIG> is a schematic exploded view of a bottom plate and part of a heat exchange core of the heat exchanger shown in <FIG>. As shown in the figures, in the present embodiment, the heat exchanger includes a top plate <NUM>, a heat exchange core <NUM> and a bottom plate <NUM>, and the heat exchange core includes multiple first plates <NUM>, multiple second plates <NUM> and multiple fins <NUM>. In the present embodiment, one of the first plates <NUM> is closer to the bottom plate <NUM> than any one of the second plates <NUM>, and one fin <NUM> is arranged between the bottom plate <NUM> and the first plate <NUM>. This fin <NUM> is also part of the heat exchange core <NUM>, and one of the second plates <NUM> is adjacent to the top plate <NUM>.

Multiple first plates <NUM> and multiple second plates <NUM> which are stacked in sequence are assembled with each other to form the heat exchange core <NUM>, and the heat exchange core <NUM> is provided with a first fluid passage and a second fluid passage isolated from each other. The heat exchanger further includes a first connecting pipe <NUM> and a second connecting pipe <NUM>. The first connecting pipe <NUM> includes a first connecting port passage <NUM>, and the second connecting pipe <NUM> includes a second connecting port passage <NUM>. The first connecting port passage <NUM> and the second connecting port passage <NUM> are in communication with the first fluid passage, and the first connecting port passage <NUM> is in communication with the second connecting port passage <NUM> through the first fluid passage.

The heat exchanger further includes an adapter <NUM> which includes a third connecting port passage <NUM> and a fourth connecting port passage <NUM>. The third connecting port passage <NUM> and the fourth connecting port passage <NUM> are in communication with the second fluid passage, and the third connecting port passage <NUM> is in communication with the fourth connecting port passage <NUM> through the second fluid passage. It should be noted herein that the adapter <NUM> may include two portions similar to the first connecting pipe <NUM> and the second connecting pipe <NUM>. The structure of the adapter in the present embodiment is conducive to the installation of an external connection pipeline. Two external connection pipes respectively in communication with the third connecting port passage <NUM> and the fourth connecting port passage <NUM> may be fixedly installed by a pressing block, which is convenient for installation and saves materials.

As shown in <FIG> and <FIG>, the first plate <NUM> includes a first plate surface <NUM>, a first corner hole portion <NUM> and a second corner hole portion <NUM> recessed into the first plate surface <NUM>, a third corner hole portion <NUM> and a fourth corner hole portion <NUM> protruding from the first plate surface <NUM>, multiple protrusions <NUM> protruding from the first plate surface <NUM>, and a first recess <NUM> and a second recess <NUM> recessed into the first plate surface <NUM>.

The first corner hole portion <NUM> is provided with a first corner hole <NUM>, the second corner hole portion <NUM> is provided with a second corner hole <NUM>, the third corner hole portion <NUM> is provided with a third corner hole <NUM>, and the fourth corner hole portion <NUM> is provided with a fourth corner hole <NUM>. The first corner hole <NUM> and the second corner hole <NUM> are round holes, the first corner hole <NUM> is in communication with the fourth connecting port passage <NUM>, and the second corner hole <NUM> is in communication with the third connecting port passage <NUM>. The third corner hole <NUM> and the fourth corner hole <NUM> are oblong holes, the third corner hole <NUM> is in communication with the second connecting port passage <NUM>, and the fourth corner hole <NUM> is in communication with the first connecting port passage <NUM>. It should be noted here that the third corner hole <NUM> and the fourth corner hole <NUM> may be in other shapes such as a circle.

The protrusions <NUM> are distributed in a region where the first plate surface <NUM> is located. In the present embodiment, most of the protrusions <NUM> are distributed between the first corner hole portion <NUM> and the third corner hole portion <NUM>, and between the second corner hole portion <NUM> and the fourth corner hole portion <NUM>. In order to improve the heat exchange performance of the heat exchanger, the protrusions <NUM> are also arranged between the first corner hole portion <NUM> and the second corner hole portion <NUM>. This part of protrusions <NUM> can function to guide the fluid, thereby improving the heat transfer coefficient of the region between the first corner hole portion <NUM> and the second corner hole portion <NUM>. Similarly, corner portions of the first plate <NUM> adjacent to the first corner hole portion <NUM> and the second corner hole portion <NUM> may also be provided with the protrusions <NUM>, and this part of protrusions <NUM> can also function to guide the fluid, thereby improving the heat transfer coefficient of these corner portion regions.

The first recess <NUM> is connected with the second recess <NUM>. The second recess <NUM> is arranged between the third corner hole portion <NUM> and the fourth corner hole portion <NUM>. The first recess <NUM> is arranged in the distribution region of the protrusions <NUM>, and most of the protrusions <NUM> are distributed on two sides of the first recess <NUM>. In the present embodiment, the protrusions <NUM> are evenly distributed on the two sides of the first recess <NUM>, and at least part of the protrusions <NUM> are symmetrically distributed on the two sides of the first recess <NUM>. Such an arrangement can improve the flow turbulence of the fluid and further cause the fluid to be evenly distributed, thereby improving the heat exchange performance of the heat exchanger.

The first recess <NUM> has a dumbbell-shaped structure with two end portions thereof wider than the middle portion thereof (one of the two end portions faces toward the third corner hole <NUM> and the fourth corner hole <NUM>, and the other of the two end portions faces the first corner hole portion <NUM> and the second corner hole portion <NUM>). The first recess <NUM> can function to guide the fluid, and this structure is also conducive to the even distribution of fluid and has low flow resistance, which can improve the heat exchange performance.

In the present embodiment, the two end portions of the first recess <NUM> are wider than the second recess <NUM>. In this arrangement, the heat exchange area of a portion between the first corner hole <NUM> and the second corner hole <NUM> is large, which is conducive to improving the heat exchange performance of the heat exchanger.

It should be noted here that a recessed structure (not shown in the figure) corresponding to the protruding structure and a protruding structure (not shown in the figure) corresponding to the recessed structure are provided on a second plate surface (not shown in the figure) side opposite to the first plate surface <NUM> of the first plate <NUM>.

As shown in <FIG> and <FIG>, the second plate <NUM> includes a first plate surface <NUM>, a first corner hole portion <NUM> and a second corner hole portion <NUM> protruding from the first plate surface <NUM>, and a first recess <NUM> and a second recess <NUM> recessed into the first plate surface <NUM>.

The first corner hole portion <NUM> is provided with a first corner hole <NUM>, the second corner hole portion <NUM> is provided with a second corner hole <NUM>, and the second plate <NUM> is further provided with a third corner hole <NUM> and a fourth corner hole <NUM>. The first corner hole <NUM> and the second corner hole <NUM> are round holes, the first corner hole <NUM> is in communication with the fourth connecting port passage <NUM>, and the second corner hole <NUM> is in communication with the third connecting port passage <NUM>. The third corner hole <NUM> and the fourth corner hole <NUM> are oblong holes, the third corner hole <NUM> is in communication with the second connecting port passage <NUM>, and the fourth corner hole <NUM> is in communication with the first connecting port passage <NUM>. It should be noted here that the third corner hole <NUM> and the fourth corner hole <NUM> may be in other shapes such as a circle.

The first recess <NUM> is connected with the second recess <NUM>, and the second recess <NUM> is arranged between the third corner hole portion <NUM> and the fourth corner hole portion <NUM>. The first recess <NUM> has a dumbbell-shaped structure with two end portions thereof wider than the middle portion thereof. The first recess <NUM> can function to guide the fluid, which is conducive to the even distribution of fluid and has low flow resistance and can improve the heat exchange performance.

It should be noted here that a recessed structure (not shown in the figure) corresponding to the protruding structure and a protruding structure (not shown in the figure) corresponding to the recessed structure are provided on a second plate surface (not shown in the figure) side opposite to the first plate surface <NUM> of the second plate <NUM>.

As shown in <FIG> and <FIG>, the fin <NUM> is arranged on the first plate surface <NUM> of the second plate <NUM>. The fin <NUM> includes a first port region <NUM> corresponding to the first corner hole portion <NUM>, a second port region <NUM> corresponding to the second corner hole portion <NUM>, a third port region <NUM> corresponding to the third corner hole <NUM>, a fourth port region <NUM> corresponding to the fourth corner hole <NUM>, and a notch region <NUM> corresponding to the first recess <NUM>. Part of the fin <NUM> is located between the first corner hole portion <NUM> and the second corner hole portion <NUM>, which ,on the one hand, can function to guide the fluid, and on the other hand, improve the flow turbulence of the coolant in this region. In this way, in the refrigerant inlet and outlet region, the coolant and refrigerant can fully conduct heat exchange, thereby improving the heat exchange performance. However, no fin is provided between the third corner hole <NUM> and the fourth corner hole <NUM>. That is because less refrigerant exists in the region close to the third corner hole <NUM> and the fourth corner hole <NUM>, and this arrangement can enable the amount of coolant and the amount of refrigerant to match, which is conducive to improving the heat exchange performance.

As shown in <FIG>, in the present embodiment, the fin <NUM> is a window fin, and a center line of a window <NUM> of the window fin <NUM> and a center line of a flow passage <NUM> of the window fin <NUM> are parallel to a width direction of the third corner hole <NUM>, which is conducive to reducing the flow resistance of the coolant, thereby improving the heat exchange performance. Here, the width direction of the third corner hole <NUM> refers to the width direction of the oblong hole. In a case that the third corner hole <NUM> has other structures, the width direction thereof is still the same as that of the oblong hole.

As shown in <FIG>, the first plate surface <NUM> of the first plate <NUM> is opposite to the second plate surface of the second plate <NUM>; the protrusions <NUM>, the third corner hole portion <NUM> and the fourth corner hole portion <NUM> of the first plate <NUM> are in contact with and fixed to the second plate surface of the second plate <NUM> by welding; the protruding structure corresponding to the second recess <NUM> of the second plate <NUM> is in contact with and fixed to the first plate surface <NUM> of the first plate <NUM> by welding; and the protruding structure corresponding to the first recess <NUM> of the second plate <NUM> is in contact with and fixed to the first recess <NUM> of the first plate <NUM> by welding, so that part of the second fluid passage is formed between the first plate surface <NUM> of the first plate <NUM> and the second plate surface of the second plate <NUM>. In addition, the first recess <NUM> of the first plate <NUM> may be deeper than the second recess <NUM> of the first plate <NUM>, and the first recess <NUM> of the second plate <NUM> may be deeper than the second recess <NUM> of the second plate <NUM>. This structure is easy to process and install, and the area of the first plate surface <NUM> is large, which is conducive to improving the heat exchange performance.

Since the protruding structures corresponding to the first recess <NUM> and the second recess <NUM> of the second plate <NUM> function to obstruct, the refrigerant flowing in from the first corner hole <NUM> flows out of the second corner hole <NUM> after successively passing through a region where the protrusions <NUM> on one side of the first recess <NUM> of the first plate <NUM> are located, a region where the second recess <NUM> of the first plate <NUM> is located, and a region where the protrusions <NUM> on the other side of the first recess <NUM> of the first plate <NUM> are located.

The second plate surface of the first plate <NUM> is opposite to the first plate surface <NUM> of the second plate <NUM>, the fin <NUM> is arranged between the second plate surface of the first plate <NUM> and the first plate surface <NUM> of the second plate <NUM>. The first corner hole portion <NUM> and the second corner hole portion <NUM> of the second plate <NUM> are in contact with and fixed to the protruding structures corresponding to the first corner hole portion <NUM> and the second corner hole portion <NUM> of the first plate <NUM> by welding. The protruding structure corresponding to the second recess <NUM> on the second plate surface side of the first plate <NUM> is in contact with and fixed to the first plate surface <NUM> of the second plate <NUM> by welding. The protruding structure corresponding to the first recess <NUM> of the first plate <NUM> is in contact with and fixed to the first recess <NUM> of the second plate <NUM> by welding. In this way, part of the first fluid passage is formed between the first plate surface <NUM> of the second plate <NUM> and the second plate surface of the first plate <NUM>.

Since the protruding structures corresponding to the first recess <NUM> and the second recess <NUM> of the first plate <NUM> function to obstruct, the coolant flowing in from the third corner hole <NUM> flows out of the fourth corner hole <NUM> after successively passing through a fin region on a side of the first recess <NUM> of the second plate <NUM>, a region where the second recess <NUM> of the second plate <NUM> is located, and a fin region on other side of the first recess <NUM> of the second plate <NUM>. By arranging the fin, the flow turbulence of the coolant can be improved, and the performance of the heat exchanger is improved.

In the present embodiment, a passage formed between the second plate surface of the first plate <NUM> and the first plate surface <NUM> of the second plate <NUM> is the first passage (not shown in the figure), and a passage formed between the first plate surface <NUM> of the first plate <NUM> and the second plate surface of the second plate <NUM> is the second passage (not shown in the figure). The number of the first passages is one more than that of the second passages, which causes the refrigerant to fully absorb heat, thereby ensuring the degree of superheat.

Claim 1:
A heat exchanger, comprising a heat exchange core (<NUM>), the heat exchange core (<NUM>) comprising a plurality of first plates (<NUM>), a plurality of second plates (<NUM>) and fins (<NUM>), wherein
the first plate (<NUM>) comprises a first plate surface (<NUM>), a plurality of protrusions (<NUM>) protruding from the first plate surface (<NUM>), and a second plate surface opposite to the first plate surface (<NUM>),
the second plate (<NUM>) comprises a first plate surface (<NUM>) and a second plate surface opposite to the first plate surface (<NUM>),
a first fluid passage and a second fluid passage isolated from each other are formed in the heat exchange core (<NUM>), the fin (<NUM>) is arranged between the second plate surface of the first plate (<NUM>) and the first plate surface (<NUM>) of the second plate (<NUM>), and the protrusions (<NUM>) are located between the first plate surface (<NUM>) of the first plate (<NUM>) and the second plate surface of the adjacent second plate (<NUM>), a first passage is formed between the second plate surface of the first plate (<NUM>) and the first plate surface (<NUM>) of the second plate (<NUM>), the first passage is part of the first fluid passage, a second passage is formed between the first plate surface (<NUM>) of the first plate (<NUM>) and the second plate surface of the second plate (<NUM>), and the second passage is part of the second fluid passage,
the first plate (<NUM>) further comprises a first corner hole portion (<NUM>) and a second corner hole portion (<NUM>) recessed into the first plate surface (<NUM>), a third corner hole portion (<NUM>) and a fourth corner hole portion (<NUM>) protruding from the first plate surface (<NUM>), and a first recess (<NUM>) and a second recess (<NUM>) recessed into the first plate surface (<NUM>),
protruding structures corresponding to the first recess (<NUM>) and the second recess (<NUM>) of the first plate (<NUM>) are provided on a second plate (<NUM>) surface side of the first plate (<NUM>), the first recess (<NUM>) of the first plate (<NUM>) is connected with the second recess (<NUM>),
characterized in that
two end portions of the first recess (<NUM>) of the first plate (<NUM>) are wider than a middle portion of the first recess (<NUM>), and the two end portions of the first recess (<NUM>) of the first plate (<NUM>) are wider than the second recess (<NUM>).