Plate heat exchanger

Abstract

The utility model discloses a plate heat exchanger which comprises a front end plate, a plurality of plate sheets and a rear end plate which are sequentially and fixedly arranged in parallel, and is characterized in that four corners of each plate sheet are respectively provided with a corner hole I, a corner hole II, a corner hole III and a corner hole IV, the corner holes I and the corner holes II serve as first runner holes, the corner holes I serve as inflow holes, and the corner holes II serve as outflow holes; the third corner hole and the fourth corner hole serve as second runner holes. The hole diameters of the first corner holes of the multiple plates are reduced in a stepped mode from the inflow end. Compared with the prior art, the utility model has the advantages that the rear aperture is reduced in a stepped manner, which is equivalent to that the circulation channel is gradually reduced, so that the instantaneous flow rate of the cross section is reduced, and the flow rate is higher than that under the condition of the same aperture, so that the whole flow channel is faster in heat exchange, better in heat exchange effect and ingenious in design; and high practical value and popularization value are realized.

Description

Technical Field

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

[0002] At present, when the flow rate of the plate heat exchanger is low, under the harsh working conditions of high heat load requirements and small end difference, the flow velocity in the corner hole flow channel between the plates will be very low, and the flow velocity will naturally decrease as time goes by, resulting in a small total heat transfer coefficient. If the heat exchange efficiency is improved by increasing the heat exchange area (the number of plates), the increase in the heat exchange area of ​​the plates will further reduce the flow velocity in the flow channel between the plates, thus entering a vicious circle.

[0003] In order to improve the heat exchange effect, various improvement schemes have appeared in the prior art, such as CN217236592U plate heat exchanger plates, CN216482428U double-wall plate heat exchanger, etc. These schemes have changed the main structure of the plate, but have not changed the flow channel corner holes, and have the disadvantages of high design cost and complex production. They are not clever enough. At present, there is a lack of innovative design from the corner hole aspect to achieve a solution to improve the heat exchange effect of the plate. Utility Model Content

[0004] The purpose of the utility model is to provide a plate heat exchanger to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] The utility model discloses a plate heat exchanger, comprising a front end plate, a plurality of plates and a rear end plate which are fixedly arranged in parallel in sequence, and is characterized in that corner holes one, two, three and four are respectively arranged at the four corners of the plates, the corner holes one and two are used as first flow channel holes, the corner hole one is used as an inflow hole, the corner hole two is used as an outflow hole, and the corner holes three and four are used as second flow channel holes; the apertures of the corner holes one of the plurality of plates are reduced in a step-like manner starting from the inflow end.

[0007] As an improvement, the corner hole one and the corner hole two are located at the length end of the plate, and the corner hole three and the corner hole four are located at the other length end of the plate.

[0008] As an improvement, the aperture of the corner hole 1 is smaller than that of the corner hole 2, the apertures of the corner holes 2 of several plates are the same, and the apertures of the corner hole 1 at the inflow end and the corner hole 2 at the outflow end are the same.

[0009] As an improvement, the apertures of the corner holes 1 and 2 are the same, the apertures of the corner holes 2 of some of the plates decrease in a step-like manner starting from the outflow end, and the apertures of the corner holes 1 at the inflow end and 2 at the outflow end are the same.

[0010] As an improvement, the apertures of the corner holes 1 and 2 are the same, the apertures of the corner holes 2 of some of the plates are enlarged in a step-wise manner starting from the outflow end, and the aperture of the corner hole 1 at the inflow end is larger than the aperture of the corner hole 2 at the outflow end.

[0011] As an improvement, the aperture of corner hole one is smaller than that of corner hole two, and corner hole three is larger than corner hole four. Corner hole four serves as an inflow hole and corner hole three serves as an outflow hole. The aperture of corner hole four of some plates decreases in a step-like manner starting from the inflow end hole.

[0012] As an improvement, it comprises 100 plates, and the aperture of the corner hole 1 is reduced in three steps starting from the inlet end hole, namely 200 mm (40 plates), 150 mm (30 plates), and 125 mm (30 plates).

[0013] The advantages of the utility model over the prior art are that the initial flow velocity of the fluid entering from the corner hole at the inlet end is constant. If the flow channel apertures are the same, the flow velocity will naturally decay after entering. However, due to the step-wise reduction of the apertures at the rear (such as Figure 4 ), which is equivalent to the gradual contraction of the flow channel, resulting in a step-wise decrease in the instantaneous flow rate of the flow channel cross section, so the flow rate is greater than the flow rate under the same aperture, thereby making the first flow channel heat exchange faster and having a better heat exchange effect. The design is ingenious, the production is simple, the cost is low, and it has high practical value and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings listed below are only some structural schematic diagrams of the utility model, not all of them.

[0015] Figure 1 This is a schematic diagram of the structure of a plate of a plate heat exchanger of the utility model. Figure 1 .

[0016] Figure 2 This is a schematic diagram of the structure of a plate of a plate heat exchanger of the utility model. Figure 2 .

[0017] Figure 3 This is a schematic diagram of the structure of a plate of a plate heat exchanger of the utility model. Figure 3 .

[0018] Figure 4 This is a side view of the corner hole arrangement of a plate heat exchanger of the utility model. Figure 1 .

[0019] Figure 5 This is a side view of the corner hole arrangement of a plate heat exchanger of the utility model. Figure 2 .

[0020] Figure 6 This is a side view of the corner hole arrangement of a plate heat exchanger of the utility model. Figure 3 .

[0021] Figure 7 This is a side view of the corner hole arrangement of a plate heat exchanger of the utility model. Figure 4 .

[0022] Reference numerals:

[0023] Plate 1; corner hole one 11; corner hole two 12; corner hole three 23; corner hole four 14; DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] This embodiment combines the attached Figures 1 to 7 , a plate heat exchanger is described in detail.

[0026] The present embodiment is a plate heat exchanger, comprising a front end plate, a plurality of plates 1 and a rear end plate which are fixedly arranged in parallel in sequence, characterized in that the four corners of the plate 1 are respectively provided with a corner hole 11, a corner hole 2 12, a corner hole 3 13 and a corner hole 4 14, the corner hole 11 and the corner hole 2 12 are used as first flow channel holes and the corner hole 11 is used as an inflow hole, the corner hole 2 12 is used as an outflow hole, the corner hole 3 13 and the corner hole 4 14 are used as second flow channel holes; the aperture of the corner hole 11 of the plurality of plates 1 is reduced in a step-like manner starting from the inflow end.

[0027] The corner hole 11 and the corner hole 2 12 are located at the length end of the plate 1 , and the corner hole 3 13 and the corner hole 4 14 are located at the other length end of the plate 1 .

[0028] The aperture of the corner hole 11 is smaller than that of the corner hole 2 12 , the apertures of the corner holes 2 12 of several plates 1 are the same, and the apertures of the corner hole 11 at the inflow end and the corner hole 2 12 at the outflow end are the same.

[0029] The corner hole 11 and the corner hole 2 12 have the same aperture, the aperture of the corner hole 2 12 of the plate 1 decreases in a step-like manner from the outflow end, and the corner hole 11 at the inflow end and the corner hole 2 12 at the outflow end have the same aperture.

[0030] The apertures of the corner holes 11 and 12 are the same, and the apertures of the corner holes 12 of the plates 1 are enlarged in a step-wise manner starting from the outflow end, and the aperture of the corner hole 11 at the inflow end is larger than the aperture of the corner hole 12 at the outflow end.

[0031] The aperture of the corner hole 11 is smaller than that of the corner hole 2 12, and the corner hole 3 13 is larger than that of the corner hole 4 14. The corner hole 4 14 serves as an inlet hole, and the corner hole 3 13 serves as an outlet hole. The apertures of the corner holes 4 14 of the plates 1 decrease in a step-like manner starting from the inlet end hole.

[0032] It comprises 100 plates 1, and the aperture of the corner hole 11 is reduced in three steps starting from the inlet end hole, namely 200 mm (40 plates), 150 mm (30 plates), and 125 mm (30 plates).

[0033] In the specific implementation, 100 plates 1 are arranged between the front plate and the rear plate, and the aperture of the corner hole 11 is reduced in three steps from the inlet end hole, namely 200 mm (40 plates), 150 mm (30 plates), and 125 mm (30 plates). Take this as an example:

[0034] The initial flow velocity of the fluid entering from the corner hole 11 at the inlet end is constant. If the flow channel apertures are the same, the flow velocity will naturally decay after entering. However, due to the step-wise reduction of the apertures behind (such as Figure 4 ), which is equivalent to the gradual contraction of the flow channel, resulting in a step-by-step decrease in the instantaneous flow rate of the flow channel cross section. Therefore, the flow velocity is greater than the flow velocity under the same aperture, thereby making the heat exchange in the first flow channel faster and the heat exchange effect better.

[0035] The corner hole 2 12 in the first flow channel that cooperates with the corner hole 1 (11) includes three embodiments, respectively: Figure 1 and Figure 4 , Figure 2 and Figure 5 , Figure 2 and Figure 6 .

[0036] An embodiment of a second flow channel cooperating with the first flow channel is as follows Figure 3 and Figure 7 .

[0037] The above description of the utility model and its implementation methods is not restrictive, and the actual protection scope is not limited to this. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A plate heat exchanger, comprising a front plate, a plurality of plates (1) and a rear plate which are fixedly arranged in parallel in sequence, characterized in that: The four corners of the plate (1) are respectively provided with a corner hole one (11), a corner hole two (12), a corner hole three (13), and a corner hole four (14); the corner hole one (11) and the corner hole two (12) serve as first flow channel holes, the corner hole one (11) serves as an inflow hole, the corner hole two (12) serves as an outflow hole, and the corner hole three (13) and the corner hole four (14) serve as second flow channel holes; the aperture of the corner hole one (11) of the plate (1) is reduced in a step-like manner starting from the inflow end.

2. A plate heat exchanger according to claim 1, characterized in that: The corner hole one (11) and the corner hole two (12) are located at the length end of the plate (1), and the corner hole three (13) and the corner hole four (14) are located at the other length end of the plate (1).

3. A plate heat exchanger according to claim 1, characterized in that: The aperture of the corner hole 1 (11) is smaller than the aperture of the corner hole 2 (12); the apertures of the corner holes 2 (12) of a plurality of the plates (1) are the same; the apertures of the corner hole 1 (11) at the inflow end and the corner hole 2 (12) at the outflow end are the same.

4. A plate heat exchanger according to claim 1, characterized in that: The apertures of the corner holes 1 (11) and 2 (12) are the same, the apertures of the corner holes 2 (12) of the plates (1) decrease in a step-like manner starting from the outflow end, and the apertures of the corner holes 1 (11) at the inflow end and 2 (12) at the outflow end are the same.

5. The plate heat exchanger according to claim 1, characterized in that: The apertures of the corner holes 1 (11) and 2 (12) are the same, and the apertures of the corner holes 2 (12) of the plates (1) are enlarged in a step-wise manner starting from the outflow end, and the aperture of the corner hole 1 (11) at the inflow end is larger than the aperture of the corner hole 2 (12) at the outflow end.

6. A plate heat exchanger according to claim 1, characterized in that: The aperture of the corner hole one (11) is smaller than the aperture of the corner hole two (12), the corner hole three (13) is larger than the corner hole four (14), the corner hole four (14) serves as an inflow hole, and the corner hole three (13) serves as an outflow hole, and the apertures of the corner holes four (14) of the plates (1) decrease in a step-like manner starting from the inflow end hole.

7. A plate heat exchanger according to claim 1, characterized in that: It comprises 100 plates (1), wherein the aperture of the corner hole 1 (11) is reduced in three steps starting from the inlet end hole, namely, 40 plates have an aperture of 200 mm, 30 plates have an aperture of 150 mm, and 30 plates have an aperture of 125 mm.

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