Flow-adjustable plate heat exchanger

Abstract

The utility model relates to a flow regulation type plate heat exchanger which comprises a front end plate, a rear end plate, a plurality of first heat exchange plates and a plurality of second heat exchange plates, and the first heat exchange plates and the second heat exchange plates are stacked between the front end plate and the rear end plate at intervals to form heat exchange runners which are arranged at intervals and respectively belong to two heat exchange media. The corner holes of the first heat exchange plates and the corner holes of the second heat exchange plates form distribution channels from the front end plate to the rear end plate, the fluid inlet is an inlet channel, the fluid outlet is an outlet channel, the distribution channels belonging to the same heat exchange medium are communicated with the heat exchange flow channel, at least the inlet channel is provided with a plurality of throttling elements, and the throttling elements are arranged in the outlet channel. The flow aperture of the inlet channel is gradually reduced from the front end plate to the rear end plate. The integral flow control of the inlet channel is facilitated, and the uniform distribution of the medium in each heat exchange flow channel is realized.

Description

Technical Field

[0001] The utility model relates to a plate heat exchanger, belonging to the technical field of heat exchangers. Background Art

[0002] Currently, in plate heat exchanger products, when the medium enters the plate heat exchanger (plate heater), when the number of heat exchange plates in the same plate heat exchanger is greater, that is, the plate heat exchanger height is higher, and the flow rate is large and the flow velocity is high, the impact flows into the tail end of the plate heat exchanger corner hole, resulting in a small flow rate in the front section of the plate heat exchanger and a large flow rate in the tail section, which leads to poor heat exchange effect. In order to solve this problem, existing factories have invented distribution holes, liquid distribution pipes, distribution rings, etc., which can only adjust the flow rate of local fluid entering the flow channel, and cannot control the overall flow rate from the corner hole from top to tail. Especially for the cold side of the plate heat exchanger, due to the high pressure, the medium entering the distributor of each flow channel layer is not uniform, which reduces the performance of the heat exchanger, resulting in a decrease in the heat exchange efficiency of the heat exchanger, thereby reducing work efficiency. Utility Model Content

[0003] The utility model aims to design a plate heat exchanger structure, which can adjust the flow rate of the flow channel layer according to the layer height of the flow channel in the stacking direction of the heat exchange plates.

[0004] The technical solution adopted by the present invention to solve the above problems is: a flow-regulating plate heat exchanger, comprising a front end plate, a rear end plate, a plurality of first heat exchange plates, and a plurality of second heat exchange plates. The plurality of first heat exchange plates and the plurality of second heat exchange plates are stacked at intervals between the front and rear end plates to form heat exchange flow channels belonging to the two heat exchange media respectively. The corner holes of the plurality of first heat exchange plates and the corner holes of the plurality of second heat exchange plates form a distribution channel from the front end plate to the rear end plate. The fluid inlet is the inlet channel, and the fluid outlet is the outlet channel. The distribution channel belonging to the same heat exchange medium is connected to the heat exchange flow channel. At least a plurality of throttling parts are arranged in the inlet channel, so that the flow diameter of the inlet channel gradually decreases from the front end plate to the rear end plate.

[0005] Preferably, the throttling element is an annular structure, which is arranged in the corner hole flow channel of two adjacent heat exchange plates, and the thickness of the throttling element is smaller than the depth of the corner hole flow channel.

[0006] Preferably, a plurality of the throttling members are welded close to the corner holes on the same side of the corner hole flow channel.

[0007] Preferably, the center of the throttling member coincides with the center of the corner hole, so as to maintain smooth flow of the medium in the inlet channel.

[0008] Preferably, a distribution hole is provided at the edge of the corner hole of the inlet channel, the throttling element is provided with a notch, and the distribution hole is located within the notch, so that the throttling element and the distribution hole are kept away from each other. The throttling element changes the flow rate of the corner hole flow channel, but does not affect the distribution of liquid from the corner hole flow channel to the heat exchange flow channel.

[0009] Preferably, a plane distribution hole is provided at the edge of the corner hole of the inlet channel, and the plane distribution holes are located outside the throttling member so as to avoid each other.

[0010] Preferably, the cross-sectional area of the through hole of the throttling member is 40% to 60% of the cross-sectional area of the flow channel of the corner hole.

[0011] Compared to existing technologies, the present invention offers advantages in that it incorporates throttling elements in the corner holes of the inlet channel to alter the flow rate within the corner holes, thereby regulating the flow rate of the media within that layer of heat exchange channels. The inlet channel flow rate is regulated by gradually decreasing flow from the front plate to the rear plate, facilitating overall flow control within the inlet channel. This improves the uniformity of the media within each heat exchange channel and enhances the heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a simplified structural diagram of a plate heat exchanger in an embodiment of the present utility model;

[0013] Figure 2 A cross-sectional view of an inlet passage with a planar distribution hole and a throttle plate provided in an embodiment of the present utility model;

[0014] Figure 3 This is a cross-sectional view of an inlet passage with a side distribution hole and a throttle plate in an embodiment of the present invention (a cross-sectional view along the centerline of the side distribution hole);

[0015] Figure 4 This is a cross-sectional view of an inlet passage with a side distribution hole and a throttle plate in an embodiment of the present invention (a cross-sectional view taken along a direction perpendicular to the centerline of the side distribution hole);

[0016] In the figure, 1 is the front end plate, 2 is the rear end plate, 3 is the first heat exchange plate, 4 is the second heat exchange plate, 5 is the throttling plate, 6 is the corner hole flow channel, 7 is the heat exchange flow channel, 8 is the side distribution hole, 9 is the interface, and 10 is the plane distribution hole. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings. The embodiments described are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention. The textual descriptions in the embodiments correspond to the accompanying drawings, and the descriptions of the directions are also based on the descriptions of the accompanying drawings, and should not be construed as limiting the scope of protection of the present invention.

[0018] like Figure 1-4 As shown, the plate heat exchanger in this embodiment comprises a front plate 1, a rear plate 2, multiple first heat exchange plates 3, multiple second heat exchange plates 4, and multiple throttle plates 5. Four interfaces 9 are provided on the front plate 1. These interfaces 9 correspond to the four corner holes of the first and second heat exchange plates 3, 4, forming four distribution channels after brazing and assembly. D1 through D4 in the figure represent the inlet and outlet channels for the two heat exchange media, respectively. The medium enters the plate heat exchanger through the inlet channel, is distributed through the corner hole flow channel 6, then enters the heat exchange flow channel 7, and finally converges into the outlet channel for outflow. The first and second heat exchange plates 3, 4 form planar distribution holes 10 or side distribution holes 8 at the corner holes.

[0019] Figure 2 It is a cross-sectional schematic diagram of an inlet channel with a planar distribution hole 10, a throttling plate 5 is installed in the corner hole flow channel 6, the planar distribution hole 10 is located on the outside of the throttling plate 5, the throttling plate 5 is between the first heat exchange plate 3 and the second heat exchange plate 4, concentric with the corner hole, and welded to the second heat exchange plate 4, the thickness of the throttling plate 5 is less than 2 times the corrugation depth of the corner hole of the heat exchange plate, that is, less than the depth of the corner hole flow channel 6, the inner diameter of the corner hole is a, the inner diameter of the first throttling plate 5 is reduced by b compared with the inner diameter of the corner hole, the inner diameter is ab, the second is reduced by b again, the inner diameter is a-2b, and it gradually decreases until the inner diameter of the nth throttling plate 5 is a-nb.

[0020] Figure 3 、 4 This is a cross-sectional view of an inlet channel with side distribution holes 8. A throttle plate 5 is installed in the corner hole flow channel 6. The throttle plate 5 is located between the first heat exchange plate 3 and the second heat exchange plate 4, concentric with the corner hole, and welded to the second heat exchange plate 4. The thickness of the throttle plate 5 is less than twice the corrugation depth of the corner hole of the heat exchange plate, that is, less than the depth of the corner hole flow channel 6. The inner diameter of the corner hole is a. The inner diameter of the first throttle plate 5 is reduced by b compared to the inner diameter of the corner hole, resulting in an inner diameter of ab. The second throttle plate is further reduced by b, resulting in an inner diameter of a-2b, gradually decreasing until the inner diameter of the nth throttle plate 5 reaches a-nb. The throttle plate 5 has an annular notch, and the side distribution hole 8 is located exactly within this notch. The notch dimension is 2R+C, where R is the radius of the side distribution hole 8 and C is the reserved distance.

[0021] The number of throttle plates installed is determined by the number of heat exchange plates in the plate heat exchanger. If the number of heat exchange plates is small, throttle plates are used in each layer of flow channels. If the number of heat exchange plates is large, throttle plates are used every few flow channels.

[0022] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A flow-regulating plate heat exchanger, comprising a front plate, a rear plate, a plurality of first heat exchange plates, and a plurality of second heat exchange plates. The plurality of first heat exchange plates and the plurality of second heat exchange plates are stacked at intervals between the front and rear plates to form heat exchange flow channels for two heat exchange media. The corner holes of the plurality of first heat exchange plates and the corner holes of the plurality of second heat exchange plates form distribution channels from the front plate to the rear plate. The fluid inlet is the inlet channel, and the fluid outlet is the outlet channel. The distribution channels for the same heat exchange medium are connected to the heat exchange flow channels. The invention is characterized in that: At least a plurality of throttling elements are provided in the inlet channel so that the flow diameter of the inlet channel gradually decreases from the front end plate to the rear end plate.

2. The flow-regulating plate heat exchanger according to claim 1, characterized in that: The throttling member is an annular structure and is arranged in the corner hole flow channels of two adjacent heat exchange plates, and the thickness of the throttling member is smaller than the depth of the corner hole flow channels.

3. The flow-regulating plate heat exchanger according to claim 2, characterized in that: The plurality of throttling members are welded close to the corner holes on the same side of the corner hole flow channel.

4. The flow-regulating plate heat exchanger according to claim 1, characterized in that: The center of the throttling element coincides with the center of the corner hole.

5. The flow-regulating plate heat exchanger according to claim 1, characterized in that: A side distribution hole is provided at the edge of the corner hole of the inlet channel, and the side distribution hole connects the corner hole flow channel and the heat exchange flow channel. The throttling member is provided with a notch groove, and the side distribution hole is located in the notch groove, so that the throttling member and the side distribution hole are avoided.

6. The flow-regulating plate heat exchanger according to claim 1, characterized in that: Plane distribution holes are provided at the edges of the corner holes of the inlet channel, and the planar distribution holes are located outside the throttling member so as to avoid each other.

7. The flow-regulating plate heat exchanger according to claim 1, characterized in that: The cross-sectional area of the through hole of the throttling element is 40% to 60% of the cross-sectional area of the flow channel of the corner hole.

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