Heat exchange core and plate heat exchanger
By using a throttling device inside the refrigerant supply pipe of the heat exchange core in a plate heat exchanger, the problem of uneven refrigerant distribution is solved, and the heat exchange effect is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG YINLUN MACHINERY
- Filing Date
- 2024-01-31
- Publication Date
- 2026-07-21
AI Technical Summary
In plate heat exchangers, the refrigerant is unevenly distributed in each channel, resulting in poor heat exchange performance.
The heat exchange core includes multiple core plates and refrigerant pipes stacked sequentially along a first direction. Throttling devices, such as throttling plates or throttling rings, are installed inside the refrigerant pipes. Through throttling, the refrigerant is evenly distributed inside the refrigerant pipes and then evenly enters the refrigerant channel.
This achieves uniform distribution of refrigerant in each refrigerant channel, improving heat exchange efficiency.
Smart Images
Figure CN117848117B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of heat exchange technology, and more particularly to a heat exchange core and a plate heat exchanger. Background Technology
[0002] In battery thermal management systems, plate heat exchangers are generally used for heat dissipation. The refrigerant and antifreeze exchange heat in the plate heat exchanger, and the cooled antifreeze passes through a loop to cool the battery module.
[0003] The plate heat exchanger comprises multiple stacked core plates, which form a first channel and a second channel. Refrigerant flows in the first channel, and antifreeze flows in the second channel. The first and second channels are not interconnected. The first channel is located on one side of the middle core plate, and the second channel is on the other side. Heat exchange occurs between the refrigerant and antifreeze through the core plate.
[0004] Plate heat exchangers have refrigerant channels that are connected to multiple first channels. The refrigerant enters the multiple first channels through the refrigerant channels. However, the amount of refrigerant entering the multiple first channels varies greatly, resulting in uneven refrigerant distribution within the plate heat exchanger and affecting the heat exchange effect. Summary of the Invention
[0005] The purpose of this application is to provide a heat exchange core and a plate heat exchanger to make the amount of refrigerant entering multiple refrigerant channels more uniform, thereby improving the heat exchange effect.
[0006] To achieve the above objectives, this application provides the following technical solution:
[0007] A heat exchange core, comprising:
[0008] Multiple core plates are stacked sequentially along a first direction, with a channel formed between adjacent core plates. The core plates located on the outermost sides of the multiple core plates are end plates, and the core plate located between two end plates is an intermediate plate. The channel on the first side of the intermediate plate is a refrigerant channel, and the channel on the second side of the intermediate plate is a medium channel. The refrigerant channel and the medium channel are not connected. The multiple refrigerant channels and the multiple medium channels are arranged at intervals along the first direction.
[0009] A refrigerant supply pipe passes through multiple intermediate plates and at least one end plate. The core plate has through holes for the refrigerant supply pipe to pass through, and the refrigerant supply pipe has multiple refrigerant supply holes, which are respectively connected to multiple refrigerant channels.
[0010] At least one throttling element disposed inside the refrigerant supply pipe.
[0011] In one implementation, the refrigerant pipe is capable of rotating about its own centerline relative to the core plate;
[0012] During the rotation of the refrigerant pipe, the throttling element moves along its length inside the refrigerant pipe; or, the throttling element is threaded to the inner wall of the refrigerant pipe, a sliding rod is fixed inside the refrigerant pipe and the throttling element has an insertion hole for the sliding rod to pass through, the sliding rod is set parallel to the center line of the refrigerant pipe, and the throttling element moves along the sliding rod when the refrigerant pipe rotates.
[0013] In one implementation, the outer wall of the refrigerant pipe has a gap between it and the edge of the through hole in the core plate; the gap between the outer wall of the refrigerant pipe and the edge of the through hole communicates with the refrigerant channel but not with the medium channel; or,
[0014] A medium channel is formed between adjacent core plates. These adjacent core plates are bonded and sealed near the outer wall of the refrigerant pipe to form a sealing joint. There is a gap between the outer wall of the refrigerant pipe and the sealing joint, or the outer wall of the refrigerant pipe is in contact with the sealing joint; or...
[0015] The outer wall of the refrigerant supply pipe is sealed with the edge of the through hole in the core plate.
[0016] In one implementation, the throttling element includes a throttling plate that is perpendicular to the centerline of the refrigerant supply pipe;
[0017] The number of throttling plates is multiple, and the multiple throttling plates are arranged sequentially along the first direction.
[0018] In one implementation, the projections of the plurality of throttling plates on the cross-section of the refrigerant supply pipe are staggered; and / or,
[0019] The area of the throttling plate is no greater than half the flow area of the refrigerant pipe; and / or,
[0020] The number of throttling plates is N, where N≥2. The refrigerant supply pipe is divided into N+1 segments along its length, with the junction of two adjacent segments serving as the dividing point. There is a one-to-one correspondence between the N throttling plates and the N dividing points, and the number of spacer plates between each throttling plate and its corresponding dividing point is less than or equal to 2; and / or,
[0021] The throttling plate includes a semi-circular plate and / or a sector shape.
[0022] In one implementation, there are two throttling plates, which are located in the upper and lower halves of the refrigerant supply pipe, respectively.
[0023] The throttling plate near the inlet end of the refrigerant pipe is located in the upper half of the refrigerant pipe, and the throttling plate away from the inlet end of the refrigerant pipe is located in the lower half of the refrigerant pipe.
[0024] In one implementation, the throttling element includes at least one throttling ring, the centerline of which coincides with the centerline of the refrigerant supply pipe.
[0025] In one implementation, the refrigerant supply pipe has an inlet end and a bottom end, respectively; the ratio of the distance from the center of the throttling ring to the bottom end of the refrigerant supply pipe to the length of the refrigerant supply pipe is X, where 10% ≤ X ≤ 70%; and the ratio of the inner diameter of the throttling ring to the inner diameter of the refrigerant supply pipe is Y.
[0026] And / or, the inner hole of the throttling ring is a round hole, an elliptical hole, or a square hole.
[0027] In one implementation, the refrigerant supply hole is an arc-shaped hole extending circumferentially along the refrigerant supply pipe, and the central angle subtended by the arc-shaped hole along the circumferential direction of the refrigerant supply pipe is greater than or equal to 180°; and / or,
[0028] The refrigerant supply port is located in the upper half of the refrigerant supply pipe; and / or,
[0029] The heat exchange core also includes a refrigerant pipe fixedly connected to the end plate, and the refrigerant pipe is connected to the inlet end of the refrigerant supply pipe.
[0030] When the heat exchange core provided by this invention is applied, the gas-liquid mixed refrigerant enters the refrigerant supply pipe and then enters multiple refrigerant channels through the refrigerant supply pipe and multiple refrigerant supply holes. Since the refrigerant supply pipe is equipped with a throttling device, the throttling device can block part of the refrigerant and slow down the speed of the refrigerant flowing to the rear area of the refrigerant supply pipe. This makes the refrigerant distribution in the front and rear areas of the refrigerant supply pipe more uniform, and thus makes the amount of refrigerant entering the multiple refrigerant channels more uniform, resulting in a better heat exchange effect.
[0031] A plate heat exchanger, with a heat exchange core as described in any of the above-mentioned embodiments. Compared with the prior art, the beneficial effects of the plate heat exchanger provided in this application are the same as the beneficial effects of the heat exchange core described above, and will not be repeated here. Attached Figure Description
[0032] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0033] Figure 1 This is an overall schematic diagram of the heat exchange core provided in the embodiments of this application;
[0034] Figure 2 A partial cross-sectional view of a heat exchange core with a throttling plate provided in an embodiment of this application;
[0035] Figure 3 A partial cross-sectional view of the heat exchange core with a throttling plate provided for an embodiment of this application;
[0036] Figure 4 A partial cross-sectional view of a heat exchanger core with a throttling ring provided in an embodiment of this application;
[0037] Figure 5 A partial cross-sectional view of the heat exchange core with a throttling ring provided for an embodiment of this application;
[0038] Figure 6 for Figure 5 Enlarged view of region A in the middle.
[0039] Figure label:
[0040] 1-End plate, 2-Intermediate plate, 2a-Sealing and fitting part, 3-Refrigerant connection pipe, 4-Refrigerant supply pipe, 4a-Refrigerant supply hole, 5-Throttle plate, 6-Throttle ring. Detailed Implementation
[0041] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0042] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise expressly specified. "Several" means one or more, unless otherwise expressly specified.
[0044] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0046] Please see Figure 1-5 The heat exchange core provided in this embodiment includes a refrigerant pipe 4, multiple core plates, and at least one throttling element. The multiple core plates are stacked sequentially along a first direction, forming a channel between adjacent core plates. The outermost core plates are end plates 1, and the core plates between the two end plates 1 are intermediate plates 2. The intermediate plates 2 are arranged sequentially between the two end plates 1, with protrusions and recesses on the intermediate plates 2 to create a channel between adjacent core plates. The channel on the first side of the intermediate plate 2 is a refrigerant channel, which can be either the side of the intermediate plate 2 closest to the inlet end of the refrigerant pipe 4 or the side away from the inlet end of the refrigerant pipe 4. The channel located on the second side of the intermediate plate 2 is a medium channel, and the medium can be antifreeze or water, etc. Specifically, the first side of the intermediate plate 2 is the side of the intermediate plate 2 closest to the inlet end of the refrigerant pipe 4, and the second side is the side of the intermediate plate 2 away from the inlet end of the refrigerant pipe 4; alternatively, the first side of the intermediate plate 2 is the side of the intermediate plate 2 away from the inlet end of the refrigerant pipe 4, and the second side is the side of the intermediate plate 2 closest to the inlet end of the refrigerant pipe 4. The refrigerant channel and the medium channel are not interconnected. Multiple refrigerant channels and multiple medium channels are arranged at intervals along the first direction, that is, multiple refrigerant channels are arranged sequentially along the first direction, and there is a medium channel between adjacent refrigerant channels.
[0047] The refrigerant supply pipe 4 can extend along a first direction. Specifically, the centerline of the refrigerant supply pipe 4 can be set along the first direction, or the centerline of the refrigerant supply pipe 4 can also form an angle with the first direction. The refrigerant supply pipe 4 passes through multiple intermediate plates 2 and at least one end plate 1, that is, the refrigerant supply pipe 4 can pass through all the core plates, or the refrigerant supply pipe 4 can also pass through one end plate 1 and multiple intermediate plates 2. The core plates have through holes for the refrigerant supply pipe 4 to pass through, that is, through holes for the refrigerant supply pipe 4 to pass through, so that the refrigerant supply pipe 4 can pass through the core plate. It should be noted that the core plates through which the refrigerant supply pipe 4 does not pass do not need to have through holes. Furthermore, the refrigerant supply pipe 4 is not connected to the medium channel. The refrigerant supply pipe 4 has multiple refrigerant supply holes 4a, which are respectively connected to multiple refrigerant channels. In this way, the refrigerant entering the refrigerant supply pipe 4 can enter the multiple refrigerant channels through the multiple refrigerant supply holes 4a, and heat exchange occurs between the refrigerant and the medium in the refrigerant channels.
[0048] There are one or more throttling elements, which are installed inside the refrigerant supply pipe 4. The flow area inside the refrigerant supply pipe 4 becomes smaller at the location of the throttling element. That is, the function of the throttling element is to reduce the flow area of the refrigerant supply pipe 4 so that the throttling element blocks part of the refrigerant from passing through.
[0049] If the refrigerant supply pipe 4 is not equipped with a throttling device, the gas-liquid mixed refrigerant will flow rapidly to the rear region of the refrigerant supply pipe 4 far from the inlet end due to pressure after entering the refrigerant supply pipe 4. The amount of refrigerant in the rear region of the refrigerant supply pipe 4 is relatively large, while the amount of refrigerant in the front region of the refrigerant supply pipe 4 near the inlet end is relatively small. This results in a small amount of refrigerant entering the refrigerant channel near the inlet end of the refrigerant supply pipe 4, while a large amount of refrigerant enters the refrigerant channel far from the inlet end of the refrigerant supply pipe 4, leading to uneven distribution of refrigerant inside the heat exchange core.
[0050] Compared with the above solutions, when the heat exchange core provided by the present invention is applied, the gas-liquid mixed refrigerant enters the refrigerant supply pipe 4 and enters multiple refrigerant channels through the refrigerant supply pipe 4 and multiple refrigerant supply holes 4a. Since the refrigerant supply pipe 4 is equipped with a throttling device, the throttling device can block part of the refrigerant and slow down the speed of the refrigerant flowing to the rear region of the refrigerant supply pipe 4, thereby making the refrigerant distribution in the front and rear regions of the refrigerant supply pipe 4 more uniform, and thus making the amount of refrigerant entering the multiple refrigerant channels more uniform, resulting in a better heat exchange effect.
[0051] Preferably, the refrigerant pipe 4 is rotatable around its own centerline, and rotates relative to the core plate during rotation. This configuration allows the refrigerant pipe 4 to change the position of the refrigerant hole 4a during rotation. For example, during rotation, the refrigerant hole 4a on the refrigerant pipe 4 can rotate to an upward, downward, or sideways position to suit different application scenarios.
[0052] In the above embodiment, during the rotation of the refrigerant supply pipe 4, the throttling element moves along its length inside the refrigerant supply pipe 4. Specifically, when the refrigerant supply pipe 4 is rotated, the throttling element moves relative to the refrigerant supply pipe 4 along its length, thereby changing the position of the throttling element within the refrigerant supply pipe 4. When the refrigerant pressure is different, rotating the refrigerant supply pipe 4 adjusts the position of the throttling element within the refrigerant supply pipe 4, making the amount of refrigerant entering the multiple refrigerant channels more uniform. Specifically, the higher the refrigerant flow rate, the further away the throttling element moves from the inlet end within the refrigerant supply pipe 4; the lower the refrigerant flow rate, the closer the throttling element moves from the inlet end within the refrigerant supply pipe 4.
[0053] The throttling device is threadedly connected to the inner wall of the refrigerant supply pipe 4. A sliding rod is fixedly installed inside the refrigerant supply pipe 4, parallel to the center line of the refrigerant supply pipe 4. The throttling device has an insertion hole through which the sliding rod passes. During the rotation of the refrigerant supply pipe 4, the sliding rod restricts the rotation of the throttling device, but the throttling device can slide along the sliding rod to allow it to move along its length inside the refrigerant supply pipe 4.
[0054] The sliding rod can be fixed relative to the core plate. Specifically, the sliding rod is fixedly connected to the support member, which passes through the refrigerant supply hole 4a and is then fixedly connected to the core plate, so that the sliding rod is fixed inside the refrigerant supply pipe 4 and does not rotate with the refrigerant supply pipe 4 during rotation. Alternatively, the support member can support the sliding rod from the inlet end of the refrigerant supply pipe 4, which is not limited here.
[0055] Furthermore, the outer wall of the refrigerant pipe 4 can have a gap with the edge of the through hole in the core plate. This gap connects the refrigerant channel to the outer wall of the refrigerant pipe 4, but does not connect to the medium channel. In this way, the edge of the through hole in the core plate does not contact the outer wall of the refrigerant pipe 4, preventing friction and allowing the refrigerant pipe 4 to rotate more smoothly. It also allows adjacent refrigerant channels to connect through the gap, enabling refrigerant flow between adjacent channels and resulting in a more uniform refrigerant distribution. Specifically, a sealing element can be installed between the two core plates forming the medium channel near the outer wall of the refrigerant pipe 4. This sealing element blocks the medium channel around the outer wall of the refrigerant pipe 4, ensuring that the gap between the outer wall of the refrigerant pipe 4 and the edge of the through hole does not connect to the medium channel. The sealing component can be an integral part of the core plate, or it can be welded to the core plate.
[0056] like Figure 5 As shown, a medium channel is formed between adjacent core plates. These adjacent core plates are bonded and sealed near the outer wall of the refrigerant pipe 4 to form a sealing joint 2a. A gap exists between the outer wall of the refrigerant pipe 4 and the sealing joint 2a. The bonding and sealing of the two adjacent core plates forming the medium channel near the outer wall of the refrigerant pipe 4 achieves a seal near the refrigerant pipe 4, preventing communication between the medium channel and the gap between the outer wall of the refrigerant pipe 4 and the edge of the through-hole, and also preventing communication between the medium channel and the refrigerant channel. The gap between the sealing joint 2a and the outer wall of the refrigerant pipe 4 allows for smoother rotation of the refrigerant pipe 4.
[0057] Alternatively, the outer wall of the refrigerant pipe 4 can also be in contact with the aforementioned sealing and fitting part 2a, so that there is friction between the refrigerant pipe 4 and the sealing and fitting part 2a when the refrigerant pipe 4 rotates. This solution is also within the protection scope of this application.
[0058] Of course, the outer wall of the refrigerant pipe 4 can also be sealed to the edge of the through hole in the core plate. Specifically, an elastic sealing gasket can be installed between the outer wall of the refrigerant pipe 4 and the edge of the through hole in the core plate. The elastic sealing gasket is fixed to the outer wall of the refrigerant pipe 4 or to the edge of the through hole in the core plate. The elastic sealing gasket has a groove, and the edge of the through hole in the core plate is located in the groove and the elastic sealing gasket is fixed to the outer wall of the refrigerant pipe 4. Alternatively, the outer wall of the refrigerant pipe 4 has a protrusion that fits into the groove and the elastic sealing gasket is fixed to the edge of the through hole in the core plate. This achieves a seal between the outer wall of the refrigerant pipe 4 and the edge of the through hole in the core plate without affecting the rotation of the refrigerant pipe 4 relative to the core plate.
[0059] like Figures 2-3 As shown, in one specific embodiment, the throttling element includes a throttling plate 5. The number of throttling plates 5 can be one or more, depending on the actual situation. The throttling plate 5 has a simple structure and can be snapped, welded, threadedly connected, or integrally formed with the inner wall of the refrigerant supply pipe 4.
[0060] Specifically, the throttling plate 5 can be set perpendicular to the center line of the refrigerant supply pipe 4, which will improve the refrigerant blocking effect. If the throttling plate 5 is set at an angle inside the refrigerant supply pipe 4, the blocking effect may be reduced or the resistance may be increased. Therefore, it is preferable that the throttling plate 5 is perpendicular to the center line of the refrigerant supply pipe 4. Of course, the case where the angle between the throttling plate 5 and the center line of the refrigerant supply pipe 4 is less than 90° is also within the scope of protection of this application.
[0061] Preferably, there are multiple throttling plates 5, arranged sequentially along a first direction, that is, from the inlet end to the bottom end of the refrigerant supply pipe 4. One end of the refrigerant supply pipe 4 is the inlet end, and the other end is the bottom end. By having multiple throttling plates 5 together block the refrigerant, the blocking effect of the throttling plates 5 is further enhanced, slowing down the flow of refrigerant to the rear region of the refrigerant supply pipe 4, ultimately making the amount of refrigerant entering the multiple refrigerant channels more uniform and improving the heat exchange effect.
[0062] In one specific embodiment, the projections of multiple throttling plates 5 onto the cross-section of the refrigerant supply pipe 4 are staggered. The cross-section of the refrigerant supply pipe 4 is perpendicular to its centerline, and the projections of the multiple throttling plates 5 onto the cross-section of the refrigerant supply pipe 4 do not overlap; that is, the projection of any one throttling plate 5 onto the cross-section of the refrigerant supply pipe 4 does not overlap with the projections of the remaining throttling plates 5 onto the cross-section of the refrigerant supply pipe 4. This arrangement allows the refrigerant to flow along a tortuous path inside the refrigerant supply pipe 4, further slowing down the refrigerant flow velocity to the rear region of the refrigerant supply pipe 4, allowing more refrigerant to enter the refrigerant channel near the inlet end of the refrigerant supply pipe 4.
[0063] Of course, depending on the actual situation, the projections of multiple throttling plates 5 on the cross-section of the refrigerant pipe 4 can partially overlap, that is, the projections of some or all of the multiple throttling plates 5 on the cross-section of the refrigerant pipe 4 can partially overlap; or the projections of some or all of the multiple throttling plates 5 on the cross-section of the refrigerant pipe 4 can completely overlap, which is not limited here.
[0064] In a preferred embodiment, there are two throttling plates 5, located in the upper and lower halves of the refrigerant supply pipe 4, respectively. Specifically, when the centerline of the refrigerant supply pipe 4 is horizontal, the horizontal plane passing through the centerline divides the interior of the refrigerant supply pipe 4 into an upper and lower half. One of the two throttling plates 5 is located in the upper half, and the other is located in the lower half. The two throttling plates 5 are staggered and block the refrigerant from different positions, causing the refrigerant to flow along a tortuous path, slowing down the refrigerant flow rate while ensuring the smoothness of the refrigerant flow as much as possible.
[0065] In the above embodiment, the throttling plate 5 near the inlet end of the refrigerant pipe 4 is located in the upper half of the refrigerant pipe 4, and the throttling plate 5 away from the inlet end of the refrigerant pipe 4 is located in the lower half of the refrigerant pipe 4. Since the refrigerant orifice 4a is generally opened in the upper half of the refrigerant pipe 4, the throttling plate 5 near the inlet end of the refrigerant pipe 4 is located in the upper half of the refrigerant pipe 4, which can better block the refrigerant in the upper half from flowing to the rear region, so that more of the refrigerant in the upper half enters the multiple refrigerant channels near the inlet end of the refrigerant pipe 4, further improving the uniformity of the refrigerant in the heat exchange core.
[0066] Of course, the technical solution in which the interior of the refrigerant pipe 4 is divided into a left half and a right half by a vertical plane passing through the center line of the refrigerant pipe 4, and one of the two throttling plates 5 is located in the left half and the other throttling plate 5 is located in the right half, is also within the scope of protection of this application.
[0067] Alternatively, there can be three throttling plates 5, which are evenly distributed around the circumference of the refrigerant pipe 4 and arranged sequentially along the length of the refrigerant pipe 4.
[0068] The area of the throttling plate 5 is no greater than half of the flow area of the refrigerant pipe 4. That is, the area of any throttling plate 5 is less than or equal to half of the flow area of the refrigerant pipe 4 at the location without a throttling element. In this way, the blocking effect of the throttling plate 5 is moderate, which can keep the refrigerant flowing at a moderate speed, neither too fast nor too slow.
[0069] In one specific embodiment, the number of throttling plates 5 is N, where N≥2. The refrigerant supply pipe 4 is evenly divided into N+1 segments along its length, with the junction of two adjacent segments serving as the dividing point, resulting in N dividing points. These N dividing points divide the refrigerant supply pipe 4 into N+1 segments. Each of the N throttling plates 5 corresponds one-to-one with one of the N dividing points, and the number of spacers between each throttling plate 5 and its corresponding dividing point is less than or equal to 2. This ensures that the multiple throttling plates 5 are approximately evenly distributed within the refrigerant supply pipe 4, resulting in a more uniform distribution of the blocking effect of the multiple throttling plates 5 and better flow stability of the refrigerant within the refrigerant supply pipe 4.
[0070] Specifically, multiple throttling plates 5 are evenly distributed along the length of the refrigerant pipe 4, or there is a gap of 1 or 2 core plates between the throttling plate 5 and its corresponding dividing point.
[0071] The throttling plate 5 includes a semi-circular plate and / or a fan shape. The throttling plate 5 can be of any shape, but is preferably a semi-circular plate and / or a fan shape to facilitate sealing with the inner wall of the refrigerant supply pipe 4. Of course, the throttling plate 5 including square plates and triangular plates is also within the scope of protection of this application.
[0072] like Figure 4 and Figure 5 As shown, in another preferred embodiment, the throttling element includes at least one throttling ring 6. The number of throttling rings 6 can be one or more, depending on the actual situation. The throttling ring 6 can be snapped, welded, threaded, or integrally formed with the inner wall of the refrigerant supply pipe 4. After the refrigerant enters the refrigerant supply pipe 4, it can pass through the inner hole of the throttling ring 6. The throttling ring 6 blocks the refrigerant from the circumferential direction to slow down the refrigerant flow rate.
[0073] The centerline of the throttling ring 6 can coincide with the centerline of the refrigerant supply pipe 4, resulting in smoother refrigerant flow within the refrigerant supply pipe 4. Alternatively, the angle between the centerline of the throttling ring 6 and the centerline of the refrigerant supply pipe 4 can also be an acute angle.
[0074] In the above embodiment, the two ends of the refrigerant supply pipe 4 are the inlet end and the bottom end, respectively. The ratio of the distance from the center of the throttling ring 6 to the bottom end of the refrigerant supply pipe 4 to the length of the refrigerant supply pipe 4 is X, where 10% ≤ X ≤ 70%. If the position of the throttling ring 6 is too close to the inlet end, the amount of refrigerant entering the refrigerant channel near the throttling ring 6 and located behind the throttling ring 6 will be relatively small. If the position of the throttling ring 6 is too far from the inlet end, it will not play a good blocking role, and the amount of refrigerant entering the refrigerant channel near the inlet end will still be relatively small. In view of the above, X is set within a reasonable range of 10%-70%. For example, X can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or 80%, preferably 40%-60%.
[0075] Furthermore, the ratio of the inner diameter of the throttling ring 6 to the inner diameter of the refrigerant supply pipe 4 is Y. Specifically, when the inner hole of the throttling ring 6 is a circular hole, the inner diameter of the throttling ring 6 is the inner diameter of the circular hole. When the inner hole of the throttling ring 6 has other shapes, the inner diameter of the throttling ring 6 may have multiple values, but all of these values conform to the above formula. In this way, the blocking effect of the throttling ring 6 is moderate, allowing the refrigerant to flow at a moderate speed, neither too fast nor too slow. For example, the value of Y can be...
[0076] In one specific embodiment, the inner hole of the throttling ring 6 can be a round hole, an elliptical hole, or a square hole. Of course, the inner hole of the throttling ring 6 can also be any shape, which is not limited here.
[0077] In the above embodiments, the throttling element may include both a throttling plate 5 and a throttling ring 6, that is, both a throttling plate 5 and a throttling ring 6 are provided inside the refrigerant supply pipe 4. Specifically, one throttling plate 5 and one throttling ring 6 may be provided, or two throttling plates 5 and a throttling ring 6 located between the two throttling plates 5 may be provided, or two throttling rings 6 and a throttling plate 5 located between the two throttling rings 6 may be provided; or multiple throttling plates 5 and multiple throttling rings 6 may be provided. When multiple throttling plates 5 and multiple throttling rings 6 are provided, the multiple throttling plates 5 and multiple throttling rings 6 may be distributed sequentially at intervals.
[0078] Of course, the throttling element can also be other components, such as any type of blocking bracket.
[0079] In the above embodiments, the refrigerant supply hole 4a is an arc-shaped hole extending circumferentially along the refrigerant supply pipe 4. Since the interface between the refrigerant channel and the refrigerant supply pipe 4 is a cylindrical surface, the arc-shaped hole can increase the opening area, allowing the refrigerant to enter the refrigerant channel more smoothly. Of course, the refrigerant supply hole 4a can also be any shape, such as a round hole or a square hole. Preferably, the central angle subtended by the arc-shaped hole along the circumference of the refrigerant supply pipe 4 is greater than or equal to 180° to ensure the flow area of the arc-shaped hole. For example, the central angle subtended by the arc-shaped hole along the circumference of the refrigerant supply pipe 4 is 180°, 200°, 220°, 250°, 280°, 300°, 320°, or 360°, etc. Of course, the central angle subtended by the arc-shaped hole along the circumference of the refrigerant supply pipe 4 can also be less than 180°, such as 90° or 120°.
[0080] Furthermore, the refrigerant supply hole 4a can also be located in the upper half of the refrigerant supply pipe 4. In this way, the refrigerant first enters the upper part of the refrigerant channel and then flows to the lower part of the refrigerant channel, extending the flow path of the refrigerant within the refrigerant channel and further improving the heat exchange effect. Of course, the refrigerant supply hole 4a can also be located in the lower half of the refrigerant supply pipe 4, or it can be located in the middle of the refrigerant supply pipe 4; this is not limited here.
[0081] The heat exchange core also includes a refrigerant pipe 3 fixedly connected to the end plate 1. The refrigerant pipe 3 is connected to the inlet end of the refrigerant supply pipe 4, so that the refrigerant outside the heat exchange core enters the refrigerant supply pipe 4 through the refrigerant pipe 3, facilitating the supply of refrigerant. The refrigerant pipe 3 and the end plate 1 can be fixedly connected by welding, interference fit, or snap-fit. The refrigerant pipe 3 and the end plate 1 are sealed to prevent refrigerant leakage. The refrigerant pipe 3 and the refrigerant supply pipe 4 can be an integral structure, or they can be fixedly connected by welding or threaded connections.
[0082] Furthermore, this application also provides a plate heat exchanger, which includes the heat exchange core provided in any of the above embodiments. Compared with the prior art, the beneficial effects of the plate heat exchanger provided in this application are the same as the beneficial effects of the heat exchange core described above, and will not be repeated here.
[0083] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0084] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A heat exchange core, characterized in that, include: Multiple core plates are stacked sequentially along a first direction, with a channel formed between adjacent core plates. The core plates located on the outermost sides of the multiple core plates are end plates, and the core plate located between two end plates is an intermediate plate. The channel on the first side of the intermediate plate is a refrigerant channel, and the channel on the second side of the intermediate plate is a medium channel. The refrigerant channel and the medium channel are not connected. The multiple refrigerant channels and the multiple medium channels are arranged at intervals along the first direction. A refrigerant supply pipe passes through multiple intermediate plates and at least one end plate. The core plate has through holes for the refrigerant supply pipe to pass through, and the refrigerant supply pipe has multiple refrigerant supply holes, which are respectively connected to multiple refrigerant channels. At least one throttling element is disposed inside the refrigerant supply pipe; The refrigerant pipe is capable of rotating relative to the core plate around its own center line; During the rotation of the refrigerant pipe, the throttling element moves along its length inside the refrigerant pipe; the throttling element is threadedly connected to the inner wall of the refrigerant pipe, a sliding rod is fixed inside the refrigerant pipe and the throttling element has an insertion hole for the sliding rod to pass through, the sliding rod is set parallel to the center line of the refrigerant pipe, and the throttling element moves along the sliding rod when the refrigerant pipe rotates.
2. The heat exchange core according to claim 1, characterized in that, The outer wall of the refrigerant pipe has a gap between it and the edge of the through hole in the core plate. This gap connects the refrigerant channel to the refrigerant channel but not to the medium channel; or... A medium channel is formed between adjacent core plates. These adjacent core plates are bonded and sealed near the outer wall of the refrigerant pipe to form a sealing joint. There is a gap between the outer wall of the refrigerant pipe and the sealing joint, or the outer wall of the refrigerant pipe is in contact with the sealing joint; or... The outer wall of the refrigerant supply pipe is sealed with the edge of the through hole in the core plate.
3. The heat exchange core according to claim 1, characterized in that, The throttling element includes a throttling plate, which is perpendicular to the centerline of the refrigerant supply pipe; The number of throttling plates is multiple, and the multiple throttling plates are arranged sequentially along the first direction.
4. The heat exchange core according to claim 3, characterized in that, The projections of the plurality of said throttling plates on the cross-section of the refrigerant supply pipe are staggered; and / or, The area of the throttling plate is no greater than half the flow area of the refrigerant pipe; and / or, The number of throttling plates is N, where N≥2. The refrigerant supply pipe is divided into N+1 segments along its length, with the junction of two adjacent segments serving as the dividing point. There is a one-to-one correspondence between the N throttling plates and the N dividing points, and the number of spacer plates between each throttling plate and its corresponding dividing point is less than or equal to 2; and / or, The throttling plate includes a semi-circular plate and / or a sector shape.
5. The heat exchange core according to claim 3, characterized in that, The number of throttling plates is two, and the two throttling plates are located in the upper half and lower half of the refrigerant supply pipe, respectively; The throttling plate near the inlet end of the refrigerant pipe is located in the upper half of the refrigerant pipe, and the throttling plate away from the inlet end of the refrigerant pipe is located in the lower half of the refrigerant pipe.
6. The heat exchange core according to claim 1, characterized in that, The throttling device includes at least one throttling ring, the centerline of which coincides with the centerline of the refrigerant supply pipe.
7. The heat exchange core according to claim 6, characterized in that, The refrigerant supply pipe has an inlet end and a bottom end at its two ends, respectively. The ratio of the distance from the center of the throttling ring to the bottom end of the refrigerant supply pipe to the length of the refrigerant supply pipe is X, where 10% ≤ X ≤ 70%. The ratio of the inner diameter of the throttling ring to the inner diameter of the refrigerant supply pipe is Y. ; And / or, the inner hole of the throttling ring is a round hole, an elliptical hole, or a square hole.
8. The heat exchange core according to any one of claims 1-7, characterized in that, The refrigerant supply hole is an arc-shaped hole extending circumferentially along the refrigerant supply pipe, and the central angle subtended by the arc-shaped hole along the circumferential direction of the refrigerant supply pipe is greater than or equal to 180°; and / or, The refrigerant supply port is located in the upper half of the refrigerant supply pipe; and / or, The heat exchange core also includes a refrigerant pipe fixedly connected to the end plate, and the refrigerant pipe is connected to the inlet end of the refrigerant supply pipe.
9. A plate heat exchanger, characterized in that, The heat exchange core as described in any one of claims 1-8.