Heat exchanger and refrigeration range hood applying same

Abstract

The utility model discloses a heat exchanger and a refrigeration range hood applying the heat exchanger, the heat exchanger comprises a heat-conducting main body and a refrigerant channel, the main body is in a hollow pipeline shape, and a space enclosed by the main body forms an airflow channel for airflow to pass through; a gap is formed in the wall part of the main body and forms the refrigerant channel; the refrigerant channel comprises two main flow channels and a branch flow channel, the two main flow channels are formed at the two ends of the main body in the length direction respectively, the main flow channels are in an annular shape matched with the main body, one main flow channel is provided with a refrigerant inlet, the other main flow channel is provided with a refrigerant outlet, and the branch flow channel extends between the two main flow channels. And the two ends of the branch runners are respectively connected with the main runners at the corresponding positions and are in fluid communication.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchange device, especially a heat exchanger and the refrigeration range hood of application have the heat exchanger. BACKGROUND

[0002] With the improvement of material life level, people's requirement to kitchen environment is higher and higher, people need to use the stove during cooking, a large amount of heat will be generated in the kitchen, which leads to the increase of the temperature of the whole space, and the comfort of the environment is reduced. At present, most families solve this problem by temporarily adding a fan, but this method is not only inconvenient, but also occupies the kitchen area.

[0003] Therefore, the existing technology has disclosed a range hood with refrigeration function, which can blow cold air from the shell of the range hood to cool the kitchen. For example, a kind of air conditioner hood disclosed in Chinese patent No. 201810525673.7, the oil fume component of the air conditioner hood includes an oil fume passage; the air conditioner component includes a condenser component, the condenser component includes a condensing air inlet and a condensing air outlet, the condensing air outlet is communicated with the oil fume passage, and the condensing air inlet is independent of the oil fume passage. However, the arrangement of this condenser utilizes the main fan of the range hood for heat dissipation, which reduces the amount of oil smoke sucked and discharged, affecting the effect of sucking oil smoke.

[0004] There is also a kitchen air conditioner disclosed in Chinese patent No. 202110029969.1, which includes an air conditioning component and a hood component, the air conditioning component includes a compressor, a condenser, a throttling element and an evaporator, the hood component includes an exhaust pipe and an exhaust fan in the exhaust pipe, and the condenser is arranged around the outer wall of the exhaust pipe.

[0005] This kitchen air conditioner can utilize oil smoke to dissipate heat for the condenser without additional power, but since the condenser is arranged around the exhaust pipe, the oil smoke needs to pass through the heat-conducting smoke pipe to exchange heat with the pipe wall of the condenser, the heat exchange path is long, and thus the heat exchange efficiency is low.

[0006] Therefore, the applicant's Chinese patent No. 202322672387.2 discloses a refrigeration range hood, the condenser of which includes a main body capable of conducting heat and a refrigerant passage arranged on the main body, the main body is in the form of a pipe, the refrigerant passage is directly formed in the wall of the main body, and the space surrounded by the main body of the condenser constitutes an exhaust passage.

[0007] The condenser has high heat conduction efficiency because oil fume and refrigerant directly contact the heat conduction main body. However, the refrigerant pipeline is arranged in the vertical axial direction and the protruding elliptical wall of the inner wall of the pipeline blocks the airflow streamline in the axial direction. Only the lower half of the protrusion of each pipeline inner wall has airflow passing through the pipeline wall for heat exchange. The airflow in the turbulent zone between the upper and lower protrusions has little airflow for heat exchange with the wall. Thus, the pipeline heat exchange is insufficient.

[0008] Therefore, further improvement is needed. Invention content

[0009] The first technical problem to be solved by the present application is to provide a heat exchanger that reduces air resistance, increases heat exchange area and improves heat exchange efficiency.

[0010] The second technical problem to be solved by the present application is to provide a refrigeration oil fume extractor using the heat exchanger.

[0011] The technical solution adopted by the present application to solve the first technical problem is a heat exchanger comprising a heat-conducting main body and a refrigerant passage. The main body is in the shape of a hollow pipeline. The space enclosed by the main body forms an airflow passage for airflow. The wall portion of the main body has a gap inside. The gap forms the refrigerant passage. The heat exchanger is characterized in that:

[0012] The refrigerant passage comprises a main flow channel and a branch flow channel. The main flow channel has two and is formed at both ends of the main body in the length direction. The main flow channel is in the shape of a ring that matches the main body. One of the main flow channels has a refrigerant inlet, and the other has a refrigerant outlet. The branch flow channel extends between the two main flow channels. The two ends of the branch flow channel are connected to the corresponding main flow channels and are in fluid communication.

[0013] The reasonable layout design of the pipeline makes the branch flow channel extend along the axial direction (length direction) of the main body, which is consistent with the flow direction when the airflow passes through the main body. This optimizes the air resistance, increases the contact heat exchange area between the airflow and the wall of the main body, and improves the heat exchange efficiency. At the same time, it can avoid the uneven heat exchange caused by the heat dissipation temperature difference between the pipelines due to the temperature difference of the incoming air or the non-heat exchange of the upper pipeline, which causes the system pressure to rise and the energy efficiency to decrease. The vertical pipeline arrangement of the branch flow channel along the axial direction of the main body is more conducive to manufacturing and production, reducing the bending internal stress.

[0014] Preferably, to further increase the heat exchange area, the branch flow channel has at least two, and each branch flow channel is arranged in the circumferential direction of the main body.

[0015] Preferably, the main body is convex at the position corresponding to the refrigerant channel, thereby forming a convex ridge, which can guide the flow and oil.

[0016] Preferably, in the cross section perpendicular to the extension direction of the refrigerant channel, the outer contour of the ridge is consistent with the contour shape of the refrigerant channel.

[0017] Preferably, to further improve the heat exchange efficiency, the main body comprises two layers of heat-conducting plates, and the refrigerant channel is formed between the two layers of heat-conducting plates.

[0018] The technical solution adopted by the utility model to solve the second technical problem is: a refrigeration oil smoke extractor, comprising an oil smoke suction assembly and a refrigeration assembly, characterized in that: the refrigeration assembly comprises the heat exchanger as described above.

[0019] Preferably, the oil smoke suction assembly comprises a fan system, and the heat exchanger is directly or indirectly connected with the air outlet of the fan system as a condenser, so that the oil smoke can be used to dissipate heat for the condenser.

[0020] Preferably, the main body is vertically arranged, and the branch flow channel extends vertically.

[0021] Preferably, the refrigerant inlet is formed in the upper main flow channel, and the refrigerant outlet is formed in the lower main flow channel, so that the oil smoke and the refrigerant flow in opposite directions, thereby increasing the heat exchange time of the oil smoke and the refrigerant.

[0022] Compared with the prior art, the utility model has the advantages that: through reasonable pipeline layout design, the branch flow channel extends along the main body axis (length direction) and is consistent with the flow direction when the airflow passes through the main body, which optimizes the air resistance, increases the contact heat exchange area of the airflow and the main body wall surface, improves the heat exchange efficiency, avoids the heat exchange unevenness caused by the heat dissipation temperature difference between the pipelines due to the temperature difference of the incoming air or the non-heat exchange of the upper pipeline caused by the refrigerant channel arranged in the direction perpendicular to the axis, thereby causing the system pressure rise and energy efficiency reduction; the vertical pipeline arrangement of the branch flow channel along the main body axis is more conducive to manufacturing and production when being curled and formed, and reduces the bending internal stress. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a schematic view of the heat exchanger of the utility model embodiment;

[0024] Figure 2 Fig. 2 is a sectional view of the heat exchanger of the utility model embodiment;

[0025] Figure 3 Fig. 3 is a partial I enlarged schematic view of the heat exchanger of the utility model embodiment; Figure 2

[0026] ​Figure 4 is a development schematic view of the heat exchanger of the embodiment of the present application;

[0027] Figure 5 is a sectional view of the heat exchanger of the prior art;

[0028] Figure 6 is a development schematic view of the heat exchanger of the prior art. DETAILED DESCRIPTION

[0029] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions.

[0030] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and since the embodiments disclosed by the present application can be arranged in different directions, these terms indicating the direction are only as an illustration and should not be regarded as a limitation, such as "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features.

[0031] Referring to Figures 1-4A heat exchanger comprises a main body 1 and a refrigerant passage 2, the main body 1 is in the shape of a hollow pipe, such as a hollow cylinder as shown in the embodiment, and the refrigerant passage 2 is formed inside the wall of the main body 1. The main body 1 comprises two layers of heat-conducting plates 11, the refrigerant passage 2 is formed between the two layers of heat-conducting plates 11, and the two layers of heat-conducting plates 11 only have a gap at the position where the refrigerant passage 2 is formed, i.e. the gap constitutes the refrigerant passage 2, and the two layers of heat-conducting plates 11 are attached at other positions. Optionally, the heat-conducting plates 11 are metal plates, such as aluminum plates, two aluminum plates are hot-rolled and shaped, the refrigerant passage 2 is formed between the two aluminum plates by blowing or wire cutting, etc. (blowing is used in the embodiment), and then the whole is rolled into the required shape. The refrigerant in the refrigerant passage 2 can withstand a pressure of 2.3 MPa after hot rolling, and the refrigerant is in zero-gap contact with the heat-conducting plates 11, so the heat exchange efficiency is extremely high, and the surface temperature of the condenser is not higher than 50℃ in natural environment. That is, the refrigerant passage 2 is not formed by laying pipes separately, but is directly formed between the two layers of heat-conducting plates 11, and the refrigerant in the refrigerant passage 2 directly contacts the opposite side walls of the two layers of heat-conducting plates 11, and the side wall of the inner layer of heat-conducting plates 11 away from the outer layer of heat-conducting plates 11 directly contacts the oil fume, so the heat transfer medium between the oil fume and the refrigerant is less, and the heat transfer efficiency is high.

[0032] The space surrounded by the main body 1 of the heat exchanger is for the airflow to pass through, and the airflow can exchange heat with the heat exchanger, and the airflow can heat or cool the heat exchanger. In the embodiment, the heat exchanger is used as a condenser and is applied to an oil smoke extractor, as described in the prior patent of the applicant in the background art, the oil smoke extractor comprises an oil smoke suction assembly and a refrigeration assembly, the oil smoke suction assembly comprises a fan system for sucking oil smoke, and the heat exchanger belongs to the refrigeration assembly (the refrigeration assembly also comprises a compressor, an evaporator and other necessary components for refrigeration), the heat exchanger is arranged downstream of the fan system of the oil smoke suction assembly, and the space surrounded by the main body 1 is for the oil smoke to pass through. The heat exchanger can be directly connected to the air outlet of the fan system, or can be connected to the fan system through an air outlet cover, and a smoke exhaust pipe is connected downstream of the heat exchanger. That is, the space surrounded by the inner layer of heat-conducting plates 11 of the main body 1 constitutes an airflow passage 12 for the oil smoke exhausted by the fan system to pass through before reaching the public flue or being exhausted into the room. This arrangement can be referred to the prior patent of the applicant mentioned in the background art.

[0033] The refrigerant passage 2 comprises a main flow channel 21 and a branch flow channel 22, wherein the main flow channel 21 has two, which are formed at the two ends of the main body 1 in the axial direction (length direction), i.e. the direction of the airflow passing through, as shown in the embodiment. Figure 1The main flow channels 21 are annular and are shaped and sized to fit the main body 1. Each main flow channel 21 can not be a closed annular, and thus the upper main flow channel 21 has a refrigerant inlet 211 and the lower main flow channel 21 has a refrigerant outlet 212, and the positions of the refrigerant inlet 211 and the refrigerant outlet 212 can be interchanged. The branch flow channels 22 are N in number, N being a natural number, and extend along the axial direction of the main body 1. When N is greater than or equal to 2, each branch flow channel 22 is spaced apart along the circumferential direction of the main body 1. The upper end of each branch flow channel 22 is connected to the upper main flow channel 21 and is in fluid communication with the upper main flow channel 21, and the lower end of each branch flow channel 22 is connected to the lower main flow channel 21 and is in fluid communication with the lower main flow channel 21. In the installed state, the axial direction of the main body 1 is the vertical direction, i.e., the main body 1 is arranged vertically, and the extension direction of the branch flow channels 22 is also the vertical direction.

[0034] The heat exchanger formed in this way has the refrigerant passage 2 formed inside the wall portion of the main body 1, and the heat-conducting plate 11 of the main body 1 is a plate member with uniform thickness. Therefore, the main body 1 is convex at the positions corresponding to the refrigerant passage 2, thereby forming a convex ridge 13. In a cross section perpendicular to the extension direction of the refrigerant passage 2 (i.e., the plane in which the cross section of the refrigerant passage 2 is located), the outer contour of the ridge 13 is consistent with the contour shape of the refrigerant passage 2.

[0035] Referring to Figure 2 When air flows (e.g., oil fume flows when applied to an extractor hood) pass from the air flow passage 12 in the main body 1 from bottom to top, as indicated by arrow B, the refrigerant of the heat exchanger passes from top to bottom, as indicated by arrow C. Therefore, the inner side wall surface of the main body 1 (including the ridge 13) is completely covered by the air flows, the heat exchange area is increased, and the heat exchange efficiency is improved.

[0036] Referring to Figure 5 In the prior art heat exchanger, the temperature of the air flow at the bottom is T0, the temperature at the middle is T1, and the temperature at the top is T2, and T2>T1>T0. The initial heat dissipation air flow temperature of each pipe is different as it goes up, the air flow temperature difference is different, the upper pipe heat exchange capacity is poor, and the air flow temperature can be higher than the pipe temperature and thus no heat exchange is performed. Therefore, the non-uniform heat exchange can cause non-uniform pipe pressure and high refrigeration system pressure.

[0037] In the heat exchanger of the present application, the initial temperature of each branch flow channel 22 is T0 from bottom to top, and the top temperature is T3, and T3>T0. The heat dissipation is uniform.

[0038] In addition, referring to Figure 6 In the prior art heat exchanger, the refrigerant passage is arranged transversely, which is equivalent to a convex reinforcing structure in front of and behind the flat plate. When the flat plate is rolled, the bending resistance of the multiple transverse pipes needs to be overcome. Referring to Figure 4In the utility model, the axial arrangement of the distribution channel 22, the edge 13 extending axially during the curling basically does not increase the difficulty of the heat exchanger bending.

[0039] The utility model discloses the "fluid communication" is the spatial position relation between two components or parts (hereinafter collectively referred to as the first part, the second part), namely fluid (gas, liquid or the mixture of both) can flow or / and be transported to the second part from the first part along the flow path, can be the first part, the second part between direct intercommunication, can be the first part, the second part through at least one third indirect intercommunication, and the third party can be such as pipeline, channel, catheter, flow guide piece, hole, groove etc. fluid passage, also can be the chamber or above combination that allows fluid to flow.

Claims

1. A heat exchanger comprising a heat-conducting main body (1) and a refrigerant passage (2), the main body (1) being in the shape of a hollow pipe, a space surrounded by the main body (1) constituting an air flow passage (12) for air flow therethrough; the wall of the main body (1) having a gap inside, the gap constituting the refrigerant passage (2); characterized in that: the refrigerant passage (2) comprises a main flow channel (21) and a branch flow channel (22), the main flow channel (21) having two and being formed at two ends of the main body (1) in the length direction, the main flow channel (21) being in the shape of a ring adapted to the main body (1), one of the main flow channels (21) having a refrigerant inlet (211) and the other of the main flow channels (21) having a refrigerant outlet (212), the branch flow channel (22) extending between the two main flow channels (21) and having two ends connected to the corresponding main flow channels (21) and in fluid communication with the corresponding main flow channels (21). The branch flow channel (22) has at least two, each of the branch flow channels (22) being arranged along the circumference of the main body (1) at intervals.

2. The heat exchanger of claim 1, wherein: The main body (1) is in the shape of a convex at the position corresponding to the refrigerant passage (2), thereby constituting a convex ridge (13).

3. The heat exchanger of claim 1, wherein: In a cross section perpendicular to the extension direction of the refrigerant passage (2), the outer contour of the ridge (13) is consistent with the contour shape of the refrigerant passage (2).

4. The heat exchanger of claim 3, wherein: The main body (1) comprises two layers of heat-conducting plates (11), the refrigerant passage (2) being formed between the two layers of heat-conducting plates (11).

5. The heat exchanger according to any one of claims 1 to 4, characterized in that: The refrigeration assembly comprises the heat exchanger as claimed in any one of claims 1 to 5.

6. A refrigeration hood comprising a fume extraction assembly and a refrigeration assembly, characterized in that: The oil fume extraction assembly comprises a fan system, the heat exchanger serving as a condenser and being directly or indirectly connected to the air outlet of the fan system.

7. The refrigerant oil extraction hood according to claim 6, characterized in that: The main body (1) is arranged vertically, and the branch flow channel (22) extends vertically.

8. The oil-extraction range hood according to claim 7, characterized in that: The refrigerant inlet (211) is formed in the upper main flow channel (21), and the refrigerant outlet (212) is formed in the lower main flow channel (21).

9. The oil-extraction range hood according to claim 8, characterized in that: ​

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