Patent Description:
A heat exchanger is a device that enables two fluids at different temperatures to exchange heat. Heat is transferred from a fluid with a high temperature to a fluid with a low temperature, thereby heating or cooling the fluid. For example, both the condenser and the evaporator in the heat pump system are types of heat exchangers. The condenser of the heat pump system generally adopts a double-tube heat exchanger. However, the average heat exchange area in the tube of the traditional double-tube heat exchanger is too small, and the residence time of the fluid per unit length is too short, resulting in the overall heat exchanger being excessively long and occupying too much volume. <CIT> relates generally to a HX tube insert for a thermal transfer device, such as a heat exchanger within an HVAC, boiler, or a water heater. <CIT> relates generally to an apparatus for condensing and cooling.

The invention is set out in the claims. In the following, each of the described methods, apparatuses, embodiments, examples, and aspects, which do not fully correspond to the invention as defined in the claims is thus not according to the invention and is, as well as the whole following description, present for illustration purposes only or to highlight specific aspects or features of the claims. Embodiments not falling under the scope of the claims should be interpreted as examples useful for understanding the invention. The main purpose of the present application is to provide a heat exchanger, aiming at solving the problems that the traditional heat exchanger requires an overall length that is too long and occupies too much volume.

In order to achieve the above purpose, the present application provides a heat exchanger, including: an outer sleeve provided with two open ends; and at least one diversion unit group provided in the outer sleeve.

A first tortuous flow channel is formed between the outer sleeve and the diversion unit group for a first fluid to flow from one end to the other end of the outer sleeve.

The diversion unit group includes a first hollow vane, a connecting channel, and a second hollow vane sequentially provided along an axial direction of the outer sleeve.

The first hollow vane, the connecting channel and the second hollow vane are sequentially connected to form a second tortuous flow channel for a second fluid to flow from one end to the other end of the outer sleeve.

In an embodiment, the first hollow vane, the connecting channel, and the second hollow vane are twisted and inclined relative to an axis of the outer sleeve.

In an embodiment, a twist and incline direction of the first hollow vane and the second hollow vane are the same, and a twist and incline direction of the connecting channel and the first hollow vane are opposite.

In an embodiment, the connecting channel is attached to an inner wall surface of the outer sleeve.

In an embodiment, the diversion unit group further includes a first central tube and a second central tube.

The first hollow vane is fixed on an outer periphery of the first central tube, one end of the first central tube away from the connecting channel is provided with a fluid inlet, the other end of the first central tube is closed, and a peripheral wall of the first central tube is provided with a first through hole communicated with the first hollow vane.

The second hollow vane is fixed on an outer periphery of the second central tube, one end of the second central tube away from the connecting channel is provided with a fluid outlet, the other end of the second central tube is closed, and a peripheral wall of the second central tube is provided with a second through hole communicated with the second hollow vane.

In an embodiment, in one diversion unit group, a plurality of the first hollow vanes, the connecting channels and the second hollow vanes are provided in a one-to-one correspondence.

Each of the first hollow vanes is spaced apart along a circumferential direction of the first central tube, the peripheral wall of the first central tube is provided with a plurality of the first through holes along the circumferential direction, and the first through holes and the first hollow vanes are communicated in a one-to-one correspondence.

Each of the second hollow vanes is spaced apart along a circumferential direction of the second central tube, and the peripheral wall of the second central tube is provided with a plurality of the second through holes along the circumferential direction, and the second through holes and the second hollow vanes are communicated in a one-to-one correspondence.

Each of the connecting channels is connected between the first hollow vane and the second hollow vane in a one-to-one correspondence.

In an embodiment, both the first central tube and the second central tube are straight tubes extending coaxially with the outer sleeve, a plurality of the first hollow vanes are evenly spaced apart along the circumferential direction of the first central tube, and the plurality of second hollow vanes are evenly spaced apart along the circumferential direction of the second central tube.

In an embodiment, at least two diversion unit groups are provided, and each group of the diversion unit groups is provided along the axial direction of the outer sleeve and communicated sequentially.

The present application further provides a heat pump system, including a compressor, a condenser, a throttle valve and an evaporator.

The compressor, the condenser, the throttle valve, and the evaporator are communicated with each other to form a circulation circuit, and the condenser adopts the above heat exchanger.

The present application further provides a dishwasher including the above heat pump system.

In the technical solution of the present application, a diversion unit group includes a first hollow vane, a connecting channel, and a second hollow vane sequentially provided along an axial direction of the outer sleeve. A first tortuous flow channel is formed between the outer sleeve and the diversion unit group for a first fluid to flow from one end to the other end of the outer sleeve. When the heat exchanger is working, the first fluid (such as water) and the second fluid (such as refrigerant) flow in reverse directions in the first tortuous flow channel and the second tortuous flow channel respectively. The first tortuous flow channel and the second tortuous flow channel are both tortuous structures extending from one end to the other end of the outer sleeve, so that the effective length of the flow channel and the effective flow path of the fluid can be extended as much as possible without increasing the length of the outer sleeve. At the same time, the first hollow vane and the second hollow vane are hollow sheet structures, which can effectively increase the contact area between the first fluid and the second fluid, and increase the residence time of the first fluid and the second fluid in the corresponding flow channel, thereby effectively improving the heat exchange efficiency. Therefore, compared with the traditional double-tube heat exchanger, the technical solution of the present application can effectively shorten the overall length of the heat exchanger, reduce the overall occupied volume of the heat exchanger, and improve the heat exchange efficiency.

In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the related art, drawings used in the embodiments or in the related art will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present application. It will be apparent to those skilled in the art that other figures can be obtained according to the structures shown in the drawings without creative work.

The realization of the objective, functional characteristics, and advantages of the present application are further described with reference to the accompanying drawings.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiment of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments perceived by those ordinary skills in the art without creative effort should be fallen within the protection scope of the present application.

It should be noted that all of the directional instructions in the embodiments of the present application (such as, up, down, left, right, front, rear. ) are only used to explain the relative position relationship and movement of each component under a specific attitude (as shown in the drawings), if the specific attitude changes, the directional instructions will change correspondingly.

Besides, the descriptions in the present application that refer to "first," "second," etc. are only for descriptive purposes and are not to be interpreted as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and/or" appearing in the whole text includes three parallel solutions. For example, "A and/or B" includes only A, or only B, or both A and B. Furthermore, technical solutions among the embodiments can be combined with each other, but must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, the technical solutions should be considered that the combination does not exist, and the technical solutions are not fallen within the protection scope claimed in the present application.

The present application provides a heat exchanger <NUM>.

As shown in <FIG> and <FIG>, in an embodiment of the present application, the heat exchanger <NUM> includes an outer sleeve <NUM> and at least one set of diversion unit groups <NUM>. The outer sleeve <NUM> is provided with two open ends; the diversion unit group <NUM> is provided in the outer sleeve <NUM>, a first tortuous flow channel <NUM> is formed between the outer sleeve <NUM> and the diversion unit group <NUM> for a first fluid to flow from one end to the other end of the outer sleeve <NUM>. The diversion unit group <NUM> includes a first hollow vane <NUM>, a connecting channel <NUM> and a second hollow vane <NUM> provided in sequence along an axial direction of the outer sleeve <NUM>. The first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM> are sequentially connected to form a second tortuous flow channel <NUM> for the second fluid to flow from one end to the other end of the outer sleeve <NUM>.

In an embodiment, the outer sleeve <NUM> is in a hollow tubular shape, and the two ends of the outer sleeve <NUM> are open. The diversion unit group <NUM> is provided in the outer sleeve <NUM>. The first tortuous flow channel <NUM> is formed between the inner peripheral surface of the outer sleeve <NUM> and the outer surface of the diversion unit group <NUM>, so that the first fluid can flow from one end to the other end of the outer sleeve <NUM> along the first tortuous flow channel <NUM>. The second tortuous flow channel <NUM> is formed inside the diversion unit group <NUM>, and the second fluid can flow from one end to the other end of the outer sleeve <NUM> along the second tortuous flow channel <NUM>. For example, in practical applications, the first fluid may be water, and the second fluid may be refrigerant. The water and the refrigerant are provided in reverse flow, that is, water enters the first tortuous flow channel <NUM> from the first open end of the outer sleeve <NUM>, and then flows through the first tortuous flow channel <NUM> to the second open end of the outer sleeve <NUM> for output. The refrigerant enters the second tortuous flow channel <NUM> from the second open end of the outer sleeve <NUM>, and then passes through the second tortuous flow channel <NUM> to the first open end of the outer sleeve <NUM> for output. The flow directions of water and refrigerant are opposite, with the water and refrigerant flow in the first tortuous flow channel <NUM> and the second tortuous flow channel <NUM> respectively, and realize heat exchange during flowing.

It should be noted that, in this embodiment, the specific quantity of diversion unit groups <NUM> in the outer sleeve <NUM> can be provided according to actual needs, for example, one, two or more sets of diversion unit groups <NUM> can be provided. As shown in <FIG>, there are two sets of diversion unit groups <NUM>, which is only an embodiment of the present application, and is not a limitation to the present application. For the convenience of description, only one set of diversion unit groups <NUM> is taken as an example for description below. As shown in <FIG> and <FIG>, the diversion unit group <NUM> includes the first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM> sequentially provided along the axial direction of the outer sleeve <NUM>. The first hollow vane <NUM> and the second hollow vane <NUM> are in a wide sheet structure, and the connecting channel <NUM> is in an elongated tubular structure. One end of the connecting channel <NUM> is connected and communicated with the first hollow vane <NUM>, and the other end of the connecting channel <NUM> is connected and communicated with the second hollow vane <NUM>. The second fluid (such as refrigerant) first enters the first hollow vane <NUM>, then enters the connecting channel <NUM> through the end of the first hollow vane <NUM>, then flows into the second hollow vane <NUM> through the connecting channel <NUM>, and finally flows out from the second hollow vane <NUM>. The entire flow path of the second fluid (that is, the second tortuous flow channel <NUM>) is tortuous rather than straight, so the effective length of the flow channel can be extended, and the flow path of the second fluid can be extended. The first hollow vanes <NUM> and the second hollow vanes <NUM> have a wide sheet structure, which can increase the contact area between the second fluid and the first fluid, thereby improving heat exchange efficiency.

According to the technical solution of the present application, a diversion unit group <NUM> is provided in the outer sleeve <NUM>, and the diversion unit group <NUM> includes a first hollow vane <NUM>, a connecting channel <NUM> and a second hollow vane <NUM> sequentially provided along the axial direction of the outer sleeve <NUM>. The first tortuous flow channel <NUM> is formed between the outer sleeve <NUM> and the diversion unit group <NUM> for the first fluid to flow through. The first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM> are sequentially connected to form the second tortuous flow channel <NUM> for the second fluid to flow through. When the heat exchanger <NUM> is working, the first fluid (such as water) and the second fluid (such as refrigerant) flow in reverse directions in the first tortuous flow channel <NUM> and the second tortuous flow channel <NUM> respectively. The first tortuous flow channel <NUM> and the second tortuous flow channel <NUM> are tortuous structure and are extended from one end to the other end of the outer sleeve <NUM>, so that the effective length of the flow path can be extended as much as possible without increasing the length of the outer sleeve <NUM>, and the effective flow distance of the fluid can be extended. Both the first hollow vane <NUM> and the second hollow vane <NUM> have a hollow sheet structure, which can effectively increase the contact area between the first fluid and the second fluid, and increase the residence time of the first fluid and the second fluid in the corresponding flow channel. Thus, the heat exchange efficiency can be effectively improved. Therefore, compared with the traditional double-tube heat exchanger, the technical solution of the present application can effectively shorten the overall length of the heat exchanger <NUM>, reduce the overall occupied volume of the heat exchanger <NUM>, and improve heat exchange efficiency.

Further, the first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM> are twisted and inclined relative to the axis of the outer sleeve <NUM>. Taking the first hollow vane <NUM> as an example, the first hollow vane <NUM> is twisted and inclined relative to the axis of the outer sleeve <NUM>, that is, the first hollow vane <NUM> has a certain twist angle relative to the axis of the outer sleeve <NUM>. The first hollow vane <NUM> extends along the axial direction of the outer sleeve <NUM> and twists along the circumferential direction of the outer sleeve <NUM>, so that the first hollow vane <NUM> presents a twisted shape rather than a completely planar structure. Similarly, the second hollow vane <NUM> is also twisted and inclined relative to the axis of the outer sleeve <NUM>, so that the second hollow vane <NUM> presents a twisted shape rather than a completely planar structure. The connecting channel <NUM> is twisted and inclined relative to the axis of the outer sleeve <NUM>, so that the connecting channel <NUM> presents a twisted shape rather than a straight-line structure.

In this embodiment, the first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM> are all in a twisted shape, such that a swirl flow can be generated when the first fluid flows along the first tortuous flow channel <NUM> and moves sequentially along the rotation direction of the outer surfaces of the first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM>, which is beneficial to increase the flow length and the residence time of the first fluid, thereby improving the heat exchange efficiency. The flow resistance of the first fluid is also reduced, thereby reducing energy consumption. When the second fluid flows along the second tortuous flow channel <NUM>, the swirl flow can be generated when the second fluid flows along the second tortuous flow channel <NUM> and moves sequentially along the rotation direction of the inner surfaces of the first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM>, which is beneficial to increase the flow length and the residence time of the second fluid, thereby improving the heat exchange efficiency.

Further, the twist and incline direction of the first hollow vane <NUM> and the second hollow vane <NUM> are the same, and the twist and incline direction of the connecting channel <NUM> and the first hollow vane <NUM> are opposite. For example, both the first hollow vane <NUM> and the second hollow vane <NUM> rotate positively relative to the axis of the outer sleeve <NUM>, and the connecting channel <NUM> rotates reversely relative to the axis of the outer sleeve <NUM>. It should be noted that the positive rotation and reverse rotation here are only relatively speaking, it shows the different rotation directions. Taking the flow of the first fluid (such as water) as an example, the first fluid flows along the surface of the first hollow vane <NUM> to generate swirling flow, and after reaching the end of the first hollow vane <NUM>, the flow of the first fluid changes suddenly due to the change of the rotation direction of the connecting channel <NUM>, which is beneficial for the first fluid to scour the outer surface of the connecting channel <NUM>. The second fluid (such as refrigerant) has a longer residence time when passing through the relatively slender connecting channel <NUM>. In this way, the convective heat transfer between the first fluid and the second fluid is improved, and the heat exchange efficiency is further improved.

Further, the connecting channel <NUM> is attached to the inner wall surface of the outer sleeve <NUM>. When the first fluid scours the outer surface of the connecting channel <NUM>, a certain impact force will be generated on the connecting channel <NUM>. The connecting channel <NUM> is a slender strip structure, and the connecting channel <NUM> is attached to the inner wall of the outer sleeve <NUM>, which improves the structural strength of the connecting channel <NUM>, prevents the connecting channel <NUM> from being broken and damaged under long-term washing, and increases the service life of the heat exchanger <NUM>. In addition, the connecting channel <NUM> is attached to the inner wall of the outer sleeve <NUM>, which is also conducive to the integral formation of the connecting channel <NUM> and the outer sleeve <NUM>. For example, the connecting channel <NUM> can be printed on the inner wall of the outer sleeve <NUM> by 3D printing technology, which can simplify the production process of the heat exchanger <NUM> and save costs.

Further, as shown in <FIG> and <FIG>, the diversion unit group <NUM> also includes the first central tube <NUM> and the second central tube <NUM>. The first hollow vane <NUM> is fixed on the outer periphery of the first central tube <NUM>, and one end of the first central tube <NUM> away from the connecting channel <NUM> is provided with a fluid inlet <NUM>. The other end of the first central tube <NUM> is closed, and the peripheral wall of the first central tube <NUM> is provided with the first through hole <NUM> communicated with the first hollow vane <NUM>. The second hollow vane <NUM> is fixed on the outer periphery of the second central tube <NUM>, one end of the second central tube <NUM> away from the connecting channel <NUM> is provided with a fluid outlet <NUM>, the other end of the second central tube <NUM> is closed, and the peripheral wall of the second central tube <NUM> is provided with the second through hole <NUM> communicated with the second hollow vane <NUM>.

In an embodiment, the first central tube <NUM> is a straight tube extending coaxially with the outer sleeve <NUM>. The first central tube <NUM> is a hollow tubular structure with an open end and a closed end. One side of the first hollow vane <NUM> is attached to the outer peripheral surface of the first central tube <NUM> and is extended along the first central tube <NUM>. The open end of the first central tube <NUM> is provided with a fluid inlet <NUM>, the side wall of the first central tube <NUM> is provided with a first through hole <NUM>, the second fluid can flow from the fluid inlet <NUM> into the first central tube <NUM>, and then flows into the first hollow vane <NUM> through the first through hole <NUM>. The second central tube <NUM> is a straight tube extending coaxially with the outer sleeve <NUM>. The second central tube <NUM> is a hollow tubular structure with an open and a closed end. One side of the second hollow vane <NUM> is attached to the outer periphery of the second central tube <NUM> and is extended along the second central tube <NUM>. The open end of the second central tube <NUM> is provided with a fluid outlet <NUM>, and the side wall of the second central tube <NUM> is provided with a second through hole <NUM>. The second fluid can flow from the first hollow vane <NUM> into the second hollow vane <NUM> through the connecting channel <NUM>, then flows into the second central tube <NUM> through the second through hole <NUM> from the second hollow vane <NUM>, and finally flows out from the fluid outlet <NUM> of the second central tube <NUM>.

Further, in one diversion unit group <NUM>, the plurality of the first hollow vanes <NUM>, the connecting channels <NUM> and the second hollow vanes <NUM> are provided in a one-to-one correspondence. Each of the first hollow vanes <NUM> is spaced apart along the circumferential direction of the first central tube <NUM>, and the peripheral wall of the first central tube <NUM> is provided with the plurality of first through holes <NUM> along the circumferential direction. The first through holes <NUM> and the first hollow vanes <NUM> are communicated in a one-to-one correspondence. Each of the second hollow vanes <NUM> is spaced apart along the circumferential direction of the second central tube <NUM>, and the peripheral wall of the second central tube <NUM> is provided with a plurality of the second through holes <NUM> along the circumferential direction. The second through holes <NUM> and the second hollow vanes <NUM> are communicated in a one-to-one correspondence. Each of the connecting channels <NUM> is connected between the first hollow vane <NUM> and the second hollow vane <NUM> in a one-to-one correspondence.

In an embodiment, a plurality of first hollow vanes <NUM> are spaced apart along the circumferential direction of the first central tube <NUM>, a plurality of second hollow vanes <NUM> are spaced apart along the circumferential direction of the second central tube <NUM>, and a plurality of connecting channels <NUM> are spaced apart along the inner peripheral surface of the outer sleeve <NUM>. One end of each connecting channel <NUM> is connected and communicated with the end of the first hollow vane <NUM> close to the inner wall surface of the outer sleeve <NUM>, and the other end of each connecting channel <NUM> is connected and communicated with the end of the second hollow vane <NUM> close to the inner wall surface of the outer sleeve <NUM>. A first channel is formed between any two adjacent first hollow vanes <NUM>, a second channel is formed between any adjacent two second hollow vanes <NUM>, and an intermediate channel is formed between the plurality of connecting channels <NUM>.

The flow path of the first fluid along the first tortuous flow channel <NUM> is generally as follows. The first fluid enters the first channel from one end of the outer sleeve <NUM>, then enters the middle channel from the first channel, and then enters the third channel from the middle channel. The flow path of the second fluid along the second tortuous flow channel <NUM> is generally as follows. The second fluid enters the first central tube <NUM> from the fluid inlet <NUM> of the first central tube <NUM>, and then passes through the plurality of first through hole <NUM> on the side wall of the first central tube <NUM> to flow into the corresponding first hollow vane <NUM>. Then, the second fluid enters into the corresponding connecting channel <NUM> at the end of each first hollow vane <NUM> close to the inner wall surface of the outer sleeve <NUM>, and then enters the second hollow vane <NUM> through the connecting channel <NUM>. The second fluid finally flows into the second central tube <NUM> through a plurality of second through holes <NUM> on the outer peripheral surface of the second central tube <NUM>, and then flows out from the fluid outlet <NUM> of the second central tube <NUM>. When entering the plurality of first hollow vanes <NUM> through the first central tube <NUM>, the second fluid undergoes divergent movement in a centrifugal direction. When entering the second central tube <NUM> from the plurality of second hollow vanes <NUM>, the second fluid undergoes convergent movement in a centripetal direction. The above design can further increase the contact area between the first fluid and the second fluid, prolong the flow and residence time of the first fluid and the second fluid in the corresponding flow channel, and improve the heat exchange efficiency.

Further, both the first central tube <NUM> and the second central tube <NUM> are straight tubes extending coaxially with the outer sleeve <NUM>, and a plurality of the first hollow vanes <NUM> are evenly distributed at intervals along the circumferential direction of the first central tube <NUM>. The plurality of second hollow vanes <NUM> are evenly distributed at intervals along the circumferential direction of the second central tube <NUM>. In this way, on the same circumferential section, the spacing between any two adjacent first hollow vanes <NUM> is equal, and the spacing between any adjacent two second hollow vanes <NUM> is equal, so that the flow distribution of the first fluid and the second fluid is more uniform and the heat exchange between the first fluid and the second fluid is more uniform.

Further, on the basis of the above embodiments, at least two diversion unit groups <NUM> are provided, and each diversion unit group <NUM> is provided in an array along the axial direction of the outer sleeve <NUM> and communicates with each other in sequence. In this way, after the second fluid flows through the second tortuous flow channel <NUM> of the first group of diversion unit groups <NUM>, it can immediately enter the second tortuous flow channel <NUM> of the next group of diversion unit groups <NUM>, so that the flow path of the second fluid can be further improved, and thus a better heat transfer effect can be achieved.

As shown in <FIG> and <FIG>, in an embodiment, the heat exchanger <NUM> includes an outer sleeve <NUM> and at least two diversion unit groups <NUM> provided in the outer sleeve <NUM>, and each diversion unit group <NUM> includes a first central tube <NUM>, a plurality of first hollow vanes <NUM>, a plurality of connecting channels <NUM>, a plurality of second hollow vanes <NUM>, and a second central tube <NUM>. A plurality of the first hollow vanes <NUM> are spaced and evenly distributed along the circumferential direction of the first central tube <NUM>, a plurality of second hollow vanes <NUM> are spaced and evenly distributed along the circumferential direction of the second central tube <NUM>, and a plurality of connecting channels <NUM> are attached to each other. The inner peripheral surface of the outer sleeve <NUM> is spaced and uniformly provided, and one end of each connecting channel <NUM> is connected and communicated with the first hollow vane <NUM>, and the other end of each connecting channel <NUM> is connected and communicated with the second hollow vane <NUM>. The first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM> are twisted and inclined relative to the axis of the outer sleeve <NUM>. The first hollow vane <NUM> and the second hollow vane <NUM> have the same twist and incline direction, and the connecting channel <NUM> and the first hollow vane <NUM> and the second hollow vane <NUM> have the opposite twist and incline direction.

In an embodiment, as shown in <FIG> and <FIG>, the first fluid (such as water) enters the first channel between any two adjacent first hollow vanes <NUM> through an opening of the outer sleeve <NUM>, and then passes through a plurality of the first channel to converge to the middle channel defined by the plurality of connecting channels <NUM>, and then diverges to the second channel between any two adjacent second hollow vanes <NUM> through the middle channel, and finally flows out from another opening of the outer sleeve <NUM>. A flow direction of the second fluid is opposite to the flow direction of the first fluid. The second fluid (such as refrigerant) enters the first central tube <NUM> from the fluid inlet <NUM> of the first central tube <NUM>, and then passes through a plurality of the first through holes <NUM> on the side wall of the first central tube <NUM> to diverge into the corresponding first hollow vane <NUM> and undergoes a divergent movement in the centrifugal direction in the first hollow vane <NUM>. Then, the second fluid enters the corresponding connecting channel <NUM> from the end of each first hollow vane <NUM> close to the inner wall surface of the outer sleeve <NUM>, and then enters the second hollow vane <NUM> through the connecting channel <NUM> and undergoes the convergent movement in the centripetal direction in the second hollow vane <NUM>. Finally, the second fluid passes through the plurality of second through holes <NUM> of the outer peripheral surface of the second central tube <NUM> to converge into the second central tube <NUM>, and then flow out from the fluid outlet <NUM> of the second central tube <NUM> into the next diversion unit group <NUM>.

In this embodiment, the first hollow vane <NUM> and the second hollow vane <NUM> have a sheet structure, which can increase the contact area between the first fluid and the second fluid and improve the heat exchange efficiency. The first hollow vane <NUM> and the second hollow vane <NUM> are in a twisted structure, which can induce the first fluid and the second fluid to generate swirling flow. This is beneficial for increasing the flow path of the first fluid and the second fluid, prolonging the residence time, and further enhancing the heat exchange efficiency. Additionally, it also reduces the flow resistance of the first fluid, thereby reducing energy consumption. The first hollow vane <NUM> and the second hollow vane <NUM> rotate in opposite directions to the connecting channel <NUM>, which is beneficial for the first fluid to scour the connecting channel <NUM>, thereby improving convective heat transfer. Generally speaking, compared with the traditional double-tube heat exchanger, under the condition of achieving the same heat exchange effect, the overall length of the heat exchanger <NUM> of the present technical solution is shorter, and the occupied volume is smaller, which is beneficial to the miniaturization of the heat pump system <NUM>.

As shown in <FIG>, the present application further provides a heat pump system <NUM>. In an embodiment, the heat pump system <NUM> includes a compressor <NUM>, a condenser <NUM>, a throttle valve <NUM>, and an evaporator <NUM>. The compressor <NUM>, the condenser <NUM>, the throttle valve <NUM> and the evaporator <NUM> are communicated with each other to form a circulation circuit, and the condenser <NUM> adopts the heat exchanger <NUM> as described above.

The heat pump system <NUM> of this solution adopts the above-mentioned heat exchanger <NUM> as the condenser <NUM>. The heat exchanger <NUM> includes an outer sleeve <NUM> and a diversion unit group <NUM>. The outer sleeve <NUM> is provided with two open ends, the diversion unit group <NUM> is provided in the outer sleeve <NUM>, and a first tortuous flow channel <NUM> is formed between the outer sleeve <NUM> and the diversion unit group <NUM> for the first fluid to flow through from one end to the other end of the outer sleeve <NUM>. The diversion unit group <NUM> includes a first hollow vane <NUM>, a connecting channel <NUM> and a second hollow vane <NUM> sequentially provided along an axial direction of the outer sleeve <NUM>. The first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM> are sequentially connected to form the second tortuous flow channel <NUM> for the second fluid to flow from one end to the other end of the outer sleeve <NUM>. Compared with the traditional double-tube heat exchanger, in the case of achieving the same heat exchange effect, the overall length of the heat exchanger <NUM> of this solution is smaller, and the occupied volume is smaller, thereby making the overall heat pump system <NUM> more compact, smaller in size, and higher in heat exchange efficiency. The specific structure of the heat exchanger <NUM> refers to the above-mentioned embodiments. Since the heat pump system <NUM> adopts all the technical solutions of all the above-mentioned embodiments, it at least possesses all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

Further, the heat pump system <NUM> includes a plurality of the condensers <NUM> (heat exchangers <NUM>), and the plurality of condensers <NUM> are connected to the circulation circuit of the heat pump system <NUM> in parallel. In this way, each condenser <NUM> can be controlled independently, and different quantities of the condensers <NUM> can be controlled to work according to actual heat exchange needs. In addition, the plurality of condensers <NUM> are connected in parallel without increasing the overall length of the heat pump system <NUM>, so that the heat pump system <NUM> can maintain a small length while having an efficient heat exchange function.

As shown in <FIG>, the present application further provides a dishwasher <NUM>. In an embodiment, the dishwasher <NUM> includes a body and a heat pump system <NUM> provided in the body. The heat pump system <NUM> includes a compressor <NUM>, a condenser <NUM>, a throttle valve <NUM> and an evaporator <NUM>. The compressor <NUM>, the condenser <NUM>, the throttle valve <NUM> and the evaporator <NUM> are communicated with each other to form a circulation circuit, and the condenser <NUM> adopts the heat exchanger <NUM> as described above. The heat exchanger <NUM> includes an outer sleeve <NUM> and a diversion unit group <NUM>. The outer sleeve <NUM> is provided with two open ends, the diversion unit group <NUM> is provided in the outer sleeve <NUM>, and a first tortuous flow channel <NUM> is formed between the outer sleeve <NUM> and the diversion unit group <NUM> for the first fluid to flow through from one end to the other end of the outer sleeve <NUM>. The diversion unit group <NUM> includes a first hollow vane <NUM>, a connecting channel <NUM> and a second hollow vane <NUM> sequentially provided along an axial direction of the outer sleeve <NUM>. The first hollow vane <NUM>, the connecting channel <NUM> and the second hollow vane <NUM> are sequentially connected to form the second tortuous flow channel <NUM> for the second fluid to flow from one end to the other end of the outer sleeve <NUM>.

In an embodiment, as shown in <FIG>, the heat pump system <NUM> is concentrated in the chassis of the dishwasher <NUM>. The heat pump system <NUM> includes a compressor <NUM>, a condenser <NUM>, a throttle valve <NUM> and an evaporator <NUM>, and the condenser <NUM> adopts the above-mentioned heat exchanger <NUM>. The refrigerant channel (that is, the second tortuous flow channel <NUM> of the heat exchanger <NUM>) of the condenser <NUM> (that is, the heat exchanger <NUM>) is sequentially connected to the throttle valve <NUM>, the evaporator <NUM> and the compressor <NUM> to form a circulation circuit for the refrigerant to flow. The outlet end of the water channel (that is, the first tortuous flow channel <NUM> of the heat exchanger <NUM>) of the condenser <NUM> (that is, the heat exchanger <NUM>) is connected to the water inlet of the circulating water pump <NUM>, and the inlet end of the water channel is connected to the water return port of the cavity sink <NUM>, and the water outlet of the circulating water pump <NUM> is connected to the spray arm <NUM> in the inner cavity of the dishwasher <NUM> through a pipeline. The quantity of spray arms <NUM> can be one, two or more according to actual needs.

Claim 1:
A heat pump system (<NUM>), comprising:
a compressor (<NUM>);
a condenser (<NUM>);
a throttle valve (<NUM>);
an evaporator (<NUM>); and
a heating exchanger (<NUM>);
the heat exchanger (<NUM>), comprising:
an outer sleeve (<NUM>) provided with two open ends; and
at least one diversion unit group (<NUM>) provided in the outer sleeve (<NUM>),
wherein:
a first tortuous flow channel (<NUM>) is formed between the outer sleeve (<NUM>) and the diversion unit group (<NUM>) for a first fluid to flow from one end to the other end of the outer sleeve (<NUM>),
the diversion unit group (<NUM>) comprises a first hollow vane (<NUM>), a connecting channel (<NUM>), and a second hollow vane (<NUM>) sequentially provided along an axial direction of the outer sleeve (<NUM>), and
the first hollow vane (<NUM>), the connecting channel (<NUM>) and the second hollow vane (<NUM>) are sequentially connected to form a second tortuous flow channel (<NUM>) for a second fluid to flow from one end to the other end of the outer sleeve (<NUM>); and
wherein the compressor (<NUM>), the condenser (<NUM>), the throttle valve (<NUM>), and the evaporator (<NUM>) are communicated with each other to form a circulation circuit, and the condenser (<NUM>) adopts the heat exchanger (<NUM>).