Plate heat exchanger with secondary distribution function

Abstract

The utility model relates to the field of heat exchangers, and in particular to a plate heat exchanger with a secondary distribution function, comprising a plurality of first plates and a second plate alternately stacked, wherein the first plate is constructed with a first annular protrusion and a first annular pressure edge; the second plate is constructed with a second annular protrusion and a second annular pressure edge; when the plurality of first plates and the second plate are alternately stacked, the first annular pressure edge is sealed and fitted with the second annular pressure edge, and a distribution chamber is formed between the second annular protrusion and the first annular protrusion above it; a first distribution channel connecting the refrigerant inlet and the distribution chamber is constructed on the first annular pressure edge and / or the second annular pressure edge; a second distribution channel connecting the distribution chamber and the refrigerant heat exchange chamber is constructed on the first annular protrusion and / or the second annular protrusion. This scheme can greatly improve the uniformity of two-phase fluid distribution through two distributions, thereby improving the plate exchange evaporation performance, and at the same time can make the process more stable, thereby reducing performance fluctuations.

Description

Technical Field

[0001] The utility model relates to the field of heat exchangers, in particular to a plate heat exchanger with a secondary distribution function. Background Art

[0002] In recent years, plate heat exchangers have been widely used in refrigeration industry, air conditioning industry, heat pump system industry, heat treatment industry, petrochemical industry, energy industry, waste heat recovery industry and other industries. The structure and working principle of the plate heat exchanger is to use metal sheets with corrugated patterns and stacked together. Multiple fluid channels are formed between the metal sheets, so that heat can be exchanged between two fluids (such as liquid to liquid or liquid to steam) according to the heat transfer characteristics of the metal sheets to achieve the purpose of heating or cooling. The plate heat exchanger has the advantages of compact structure, high heat transfer efficiency, small size, and easy maintenance and inspection.

[0003] The existing plate heat exchanger can refer to a plate heat exchanger recorded in the Chinese utility model patent with the announcement number "CN2821502Y", including a front outer baffle, a rear outer baffle, and a plurality of corrugated plates arranged between the front outer baffle and the rear outer baffle; the refrigerant heat exchange cavity and the coolant heat exchange cavity are alternately formed between the front outer baffle, the rear outer baffle and the plurality of corrugated plates inside, and the refrigerant and the coolant realize heat exchange on both sides of the corrugated plates. In practical applications, the fluid of the plate heat exchanger is usually a two-phase mixed fluid, and the two-phase flow distribution is crucial to the evaporation performance of the plate exchange.

[0004] The prior art can refer to a plate heat exchanger with distribution holes recorded in the Chinese utility model patent with announcement number "CN220649185U", which includes a plurality of first plates and second plates alternately stacked, and the first plates and second plates are respectively constructed with first annular protrusions and second annular protrusions with opposite protruding directions along the refrigerant inlet; at least one distribution hole is constructed on the first plate outside the first annular protrusion, and the second annular protrusion extends radially outward to form at least one boss connected to it; when the first plate and the second plate are stacked, the distribution hole is within the coverage area of ​​the boss and a distribution cavity is formed above the distribution hole, and the refrigerant inlet communicates with the refrigerant heat exchange cavity through the distribution hole. The above scheme uses the distribution hole to distribute the refrigerant once, which is difficult to distribute evenly, and has high requirements for processing accuracy. For example, the distribution hole is easily deformed during the stamping of the plate, which affects the distribution. Summary of the invention

[0005] In order to solve the above problems, the purpose of the utility model is to provide a plate heat exchanger with a secondary distribution function. This solution can greatly improve the uniformity of two-phase fluid distribution through two distributions, thereby improving the plate evaporation performance, and at the same time make the process more stable, thereby reducing performance fluctuations.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The plate heat exchanger with secondary distribution function comprises a plurality of first plates and second plates alternately stacked, a refrigerant heat exchange cavity and a secondary coolant heat exchange cavity are alternately formed between the first plates and the second plates, and a refrigerant inlet and a refrigerant outlet communicating with the refrigerant heat exchange cavity, and a secondary coolant inlet and a secondary coolant outlet communicating with the secondary coolant heat exchange cavity are arranged on the first plates and the second plates; the characteristics are:

[0008] The first plate is provided with a first annular protrusion around the refrigerant inlet, and a first annular pressing edge flush with the surface of the first plate is formed on the radial inner side of the first annular protrusion; the second plate is provided with a second annular protrusion around the refrigerant inlet, and a second annular pressing edge flush with the surface of the second plate is formed on the radial inner side of the second annular protrusion; the first annular protrusion and the second annular protrusion have opposite protruding directions relative to the axial direction of the refrigerant inlet;

[0009] When multiple first plates and second plates are stacked alternately, the first annular pressure edge is sealed and fitted with the second annular pressure edge, and a distribution chamber is formed between the second annular protrusion and the first annular protrusion above it, and is sealed and fitted with the first annular protrusion below it; a first distribution channel connecting the refrigerant inlet and the distribution chamber is constructed on the first annular pressure edge and / or the second annular pressure edge; a second distribution channel connecting the distribution chamber and the refrigerant heat exchange chamber is constructed on the first annular protrusion and / or the second annular protrusion.

[0010] The utility model adopts the above technical solution, which relates to a plate heat exchanger with a secondary distribution function, in which the first plate and the second plate are alternately stacked, and the first plate and the second plate are connected to form a refrigerant input channel, a refrigerant output channel, a secondary coolant input channel and a secondary coolant output channel. When the plate heat exchanger is used, the refrigerant flows from the refrigerant input channel to be distributed to each refrigerant heat exchange cavity, and then converges to the refrigerant output channel; the secondary coolant flows from the secondary coolant input channel to be distributed to each secondary coolant heat exchange cavity, and then converges to the secondary coolant output channel. The secondary coolant and the refrigerant perform heat exchange on both sides of the plate heat exchanger.

[0011] On this basis, the present solution further forms a distribution chamber between the first plate and the second plate, and constructs a first distribution channel connecting the refrigerant inlet and the distribution chamber on the first annular pressure edge and / or the second annular pressure edge; and constructs a second distribution channel connecting the distribution chamber and the refrigerant heat exchange chamber on the first annular protrusion and / or the second annular protrusion. When used in this way, the two-phase refrigerant first enters the distribution chamber from the first distribution channel for a distribution, and then flows into the refrigerant heat exchange chamber through the second distribution channel for distribution on both sides.

[0012] The above scheme can greatly improve the uniformity of two-phase fluid distribution through two distributions, thereby improving the plate exchange evaporation performance, and at the same time make the process more stable, thereby reducing performance fluctuations.

[0013] Preferably, the first distribution channel and the second distribution channel are respectively located on both sides of the refrigerant inlet in the radial direction. The first distribution channel and the second distribution channel can maximize the refrigerant travel in the distribution chamber and distribute the refrigerant more evenly.

[0014] In a more preferred solution, a convex rib protruding in the axial direction of the refrigerant inlet is constructed on the first annular pressing edge and / or the second annular pressing edge, and the convex rib radially penetrates the inner and outer sides of the first annular pressing edge or the second annular pressing edge; when the first annular pressing edge is sealed with the second annular pressing edge, the convex rib on the first annular pressing edge and / or the second annular pressing edge forms the first distribution channel. The convex rib in the solution here is a semicircular convex rib, and in this solution, the convex rib can be formed only on the first annular pressing edge or the second annular pressing edge, and then the first distribution channel is formed only by a single semicircular convex rib.

[0015] Alternatively, the first annular pressing edge and the second annular pressing edge are both formed with convex ribs protruding in opposite axial directions of the refrigerant inlet; when the first annular pressing edge is sealed with the second annular pressing edge, the convex ribs on the first annular pressing edge and the second annular pressing edge are butted together to form the first distribution channel. In this solution, convex ribs are formed on both the first annular pressing edge and the second annular pressing edge, and two semicircular convex ribs are butted together to form a circular first distribution channel.

[0016] Preferably, a connecting protrusion is constructed on the radial outer side of the first annular protrusion or the second annular protrusion, and a distribution hole is constructed on the connecting protrusion or on the first plate or the second plate in the axial projection area, and the distribution hole serves as the second distribution channel. The scheme here can be to punch the distribution hole on the connecting protrusion, or to punch the first plate or the second plate opposite to the connecting protrusion as in the Chinese utility model patent with the announcement number "CN220649185U".

[0017] In a further preferred embodiment, a plurality of distribution holes are constructed on the connecting protrusion or on the first plate or the second plate in its axial projection area; or a plurality of connecting protrusions are constructed radially outside the first annular protrusion or the second annular protrusion, and a distribution hole is constructed on each connecting protrusion or on the first plate or the second plate in its projection area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a partial three-dimensional diagram of a plate heat exchanger with secondary distribution function.

[0019] Figure 2 It is a cross-sectional view of a plate heat exchanger with secondary distribution function. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] like Figure 1 and 2 As shown, this embodiment relates to a plate heat exchanger with a secondary distribution function, comprising a plurality of first plates 1 and second plates 2 alternately stacked, a refrigerant heat exchange cavity 3 and a secondary coolant heat exchange cavity alternately formed between the first plates 1 and the second plates 2, and a refrigerant inlet 101 and a refrigerant outlet communicating with the refrigerant heat exchange cavity 3, as well as a secondary coolant inlet and a secondary coolant outlet communicating with the secondary coolant heat exchange cavity are provided on the first plates 1 and the second plates 2. The technical scheme relates to a plate heat exchanger with a secondary distribution function, wherein the first plates and the second plates in the plate heat exchanger are alternately stacked, and the first plates and the second plates are connected to form a refrigerant input channel, a refrigerant output channel, a secondary coolant input channel and a secondary coolant output channel respectively. When the plate heat exchanger is used, the refrigerant flows from the refrigerant input channel to be distributed to each refrigerant heat exchange cavity, and then converges to the refrigerant output channel. The secondary coolant flows from the secondary coolant input channel to be distributed to each secondary coolant heat exchange cavity, and then converges to the secondary coolant output channel. The coolant and refrigerant exchange heat on both sides of the plate heat exchanger.

[0026] On this basis, if Figure 2As shown, the first plate 1 is constructed with a first annular protrusion 11 around the refrigerant inlet 101, and a first annular pressure edge 12 flush with the surface of the first plate 1 is formed on the radial inner side of the first annular protrusion 11. The second plate 2 is constructed with a second annular protrusion 21 around the refrigerant inlet 101, and a second annular pressure edge 22 flush with the surface of the second plate 2 is formed on the radial inner side of the second annular protrusion 21. The first annular protrusion 11 and the second annular protrusion 21 have opposite protruding directions relative to the axial direction of the refrigerant inlet 101. When multiple first plates 1 and second plates 2 are alternately stacked, the first annular pressure edge 12 and the second annular pressure edge 22 are sealed and fitted, and a distribution chamber 103 is formed between the second annular protrusion 21 and the first annular protrusion 11 above it, and is sealed and fitted with the first annular protrusion 11 below it. A first distribution channel 102 connecting the refrigerant inlet 101 and the distribution chamber 103 is constructed on the first annular pressure edge 12 and / or the second annular pressure edge 22. A second distribution channel connecting the distribution chamber 103 and the refrigerant heat exchange chamber 3 is constructed on the first annular protrusion 11 and / or the second annular protrusion 21. In this solution, a distribution chamber 103 is also formed between the first plate and the second plate, and a first distribution channel 102 connecting the refrigerant inlet 101 and the distribution chamber 103 is constructed on the first annular pressure edge 12 and / or the second annular pressure edge 22. A second distribution channel 104 connecting the distribution chamber 103 and the refrigerant heat exchange chamber 3 is constructed on the first annular protrusion 11 and / or the second annular protrusion 21. When used in this way, the two-phase refrigerant first enters the distribution chamber 103 from the first distribution channel 102 for a distribution, and then flows into the refrigerant heat exchange chamber 3 through the second distribution channel 104 for distribution on both sides.

[0027] The above solution can greatly improve the uniformity of two-phase fluid distribution through two distributions, thereby improving the plate exchange evaporation performance, and can also make the process more stable, thereby reducing performance fluctuations. In a further solution, the first distribution channel 102 and the second distribution channel 104 are respectively located on both sides of the radial direction of the refrigerant inlet 101. The first distribution channel 102 and the second distribution channel 104 can maximize the refrigerant travel in the distribution chamber 103, and the refrigerant distribution is more uniform.

[0028] In a more preferred solution, a convex rib 105 protruding in the axial direction of the refrigerant inlet 101 is constructed on the first annular pressing edge 12 and / or the second annular pressing edge 22, and the convex rib 105 penetrates the inner and outer sides of the first annular pressing edge 12 or the second annular pressing edge 22 in the radial direction. When the first annular pressing edge 12 and the second annular pressing edge 22 are sealed and fitted, the first distribution channel 102 is formed in the convex rib 105 on the first annular pressing edge 12 and / or the second annular pressing edge 22. The convex rib 105 in the solution here is a semicircular convex rib 105. In this solution, the convex rib 105 can be formed only on the first annular pressing edge 12 or the second annular pressing edge 22, and then the first distribution channel 102 is formed only by a single semicircular convex rib 105. Alternatively, both the first annular pressing edge 12 and the second annular pressing edge 22 are constructed with convex ribs 105 protruding in the opposite axial directions of the refrigerant inlet 101. When the first annular pressing edge 12 is sealed with the second annular pressing edge 22, the convex ribs 105 on the first annular pressing edge 12 and the second annular pressing edge 22 are connected to form the first distribution channel 102. In this scheme, the convex ribs 105 are formed on both the first annular pressing edge 12 and the second annular pressing edge 22, and the two semicircular convex ribs 105 are connected to form the circular first distribution channel 102.

[0029] In a more preferred solution, a connecting protrusion 106 is constructed on the radial outer side of the first annular protrusion 11 or the second annular protrusion, and a distribution hole is constructed on the connecting protrusion 106 or on the first plate 1 or the second plate 2 in its axial projection area, and the distribution hole serves as the second distribution channel 104. The solution here can be to punch the distribution hole on the connecting protrusion 106, or to punch the first plate 1 or the second plate 2 opposite to the connecting protrusion 106 as in the Chinese utility model patent with the announcement number "CN220649185U". Multiple distribution holes are constructed on the connecting protrusion 106 or on the first plate 1 or the second plate 2 in its axial projection area. Alternatively, multiple connecting protrusions 106 are constructed on the radial outer side of the first annular protrusion 11 or the second annular protrusion, and a distribution hole is constructed on each connecting protrusion 106 or on the first plate 1 or the second plate 2 in its projection area.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A plate heat exchanger with a secondary distribution function, comprising a plurality of first plates (1) and second plates (2) alternately stacked, a refrigerant heat exchange cavity (3) and a secondary coolant heat exchange cavity alternately formed between the first plates (1) and the second plates (2), a refrigerant inlet (101) and a refrigerant outlet communicating with the refrigerant heat exchange cavity (3), and a secondary coolant inlet and a secondary coolant outlet communicating with the secondary coolant heat exchange cavity being provided on the first plates (1) and the second plates (2); characterized in that: The first plate (1) is formed with a first annular protrusion (11) around the refrigerant inlet (101), and a first annular pressing edge (12) is formed on the radial inner side of the first annular protrusion (11) and is flush with the surface of the first plate (1); the second plate (2) is formed with a second annular protrusion (21) around the refrigerant inlet (101), and a second annular pressing edge (22) is formed on the radial inner side of the second annular protrusion (21) and is flush with the surface of the second plate (2); the first annular protrusion (11) and the second annular protrusion (21) have opposite protruding directions relative to the axial direction of the refrigerant inlet (101); a plurality of first plates (1) and second plates (2) are connected to each other. When the plates (2) are alternately stacked, the first annular pressing edge (12) and the second annular pressing edge (22) are sealed together, and a distribution chamber (103) is formed between the second annular protrusion (21) and the first annular protrusion (11) above it, and is sealed together with the first annular protrusion (11) below it; a first distribution channel (102) connecting the refrigerant inlet (101) and the distribution chamber (103) is constructed on the first annular pressing edge (12) and / or the second annular pressing edge (22); and a second distribution channel (104) connecting the distribution chamber (103) and the refrigerant heat exchange chamber (3) is constructed on the first annular protrusion (11) and / or the second annular protrusion (21).

2. The plate heat exchanger with secondary distribution function according to claim 1, characterized in that: The first distribution channel (102) and the second distribution channel (104) are respectively located on two radial sides of the refrigerant inlet (101).

3. The plate heat exchanger with secondary distribution function according to claim 1 or 2, characterized in that: The first annular pressing edge (12) and / or the second annular pressing edge (22) are provided with a convex rib (105) protruding in the axial direction toward the refrigerant inlet (101), and the convex rib (105) radially penetrates the inner and outer sides of the first annular pressing edge (12) or the second annular pressing edge (22); when the first annular pressing edge (12) and the second annular pressing edge (22) are sealed and fitted, the first distribution channel (102) is formed inside the convex rib (105) on the first annular pressing edge (12) and / or the second annular pressing edge (22).

4. The plate heat exchanger with secondary distribution function according to claim 3, characterized in that: The first annular pressing edge (12) and the second annular pressing edge (22) are both provided with convex ribs (105) protruding in axial directions opposite to the refrigerant inlet (101); when the first annular pressing edge (12) and the second annular pressing edge (22) are sealed and fitted together, the convex ribs (105) on the first annular pressing edge (12) and the second annular pressing edge (22) are butted against each other to form a first distribution channel (102).

5. The plate heat exchanger with secondary distribution function according to claim 1 or 2, characterized in that: A connecting protrusion (106) is constructed on the radial outer side of the first annular protrusion (11) or the second annular protrusion, and a distribution hole is constructed on the connecting protrusion (106) or on the first plate (1) or the second plate (2) in its axial projection area, and the distribution hole serves as a second distribution channel (104).

6. The plate heat exchanger with secondary distribution function according to claim 5, characterized in that: A plurality of distribution holes are constructed on the connecting protrusion (106) or on the first plate (1) or the second plate (2) in its axial projection area; or a plurality of connecting protrusions (106) are constructed radially outside the first annular protrusion (11) or the second annular protrusion, and a distribution hole is constructed on each connecting protrusion (106) or on the first plate (1) or the second plate (2) in its projection area.

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