A compact plate heat exchanger

Abstract

This utility model relates to the field of heat exchanger technology, and in particular to a compact plate heat exchanger. Each fixing screw has a fixing plate fixedly connected to one end, a pressure plate slidably connected to each fixing screw, and a spring fixedly connected to each fixing plate. One end of each spring is fixedly connected to the corresponding pressure plate, and a fixing nut is connected to the other end of each fixing screw. This utility model utilizes the expansion of the metal plates during heat exchange. The expanded metal plates compress the first frame and the gasket, the first frame compresses the pressure plate, and the pressure plate compresses the spring, increasing the spring's compression to maintain constant pressure. During cooling, the spring rebounds to compensate for the contraction. The elastic clamping force provided can maintain a constant value, reducing the risk of gasket failure due to overpressure hardening or stress relaxation, and preventing gasket breakage caused by excessively tight bolts due to thermal deformation, thereby preventing leakage.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a compact plate heat exchanger. Background Technology

[0002] Plate heat exchangers are a type of efficient and compact heat exchange equipment. They form flow channels by stacking multiple layers of metal plates, allowing two fluids to flow alternately between the plates and exchange heat through the plates.

[0003] In existing technology, plate heat exchangers consist of metal plates, rubber gaskets, frames, interfaces, and bolt fasteners. The metal plates are located between two frames, and the rubber gaskets are located between the metal plates. The two frames are fixed together by bolt fasteners, and the two frames clamp the metal plates. The metal plates compress the rubber gaskets, which can easily cause the rubber gaskets to deform due to excessive compression. When hot and cold fluids are introduced into the interface for heat exchange, heat is transferred to the metal plates, and then the metal plates transfer heat to the rubber gaskets. Due to the excessive compression of the rubber gaskets caused by the thermal expansion of the metal plates, their surfaces are prone to cracking and brittleness, resulting in a decrease in compression resilience. This leads to a reduction in the sealing effect, causing liquid to leak from the gap between the two metal plates, ultimately causing the plate heat exchanger to leak. Utility Model Content

[0004] The purpose of this invention is to solve the problem that in the prior art, the rubber gasket is subjected to excessive compression by the metal plate after thermal expansion, which easily causes cracking and brittleness on its surface, reduces the compression rebound rate, and thus reduces the sealing effect, resulting in liquid leakage from the gap between the two metal plates and ultimately causing leakage in the plate heat exchanger. Therefore, a compact plate heat exchanger is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A compact plate heat exchanger is designed, comprising a first frame and a second frame, the second frame being slidably inserted into the first frame, and a plurality of fixing screws being inserted between the first frame and the second frame. One end of each fixing screw is fixedly connected to a fixing plate, and a pressure plate is slidably connected to each fixing screw. Each pressure plate is in contact with the first frame, and a spring is fixedly connected to each fixing plate. One end of each spring is fixedly connected to a corresponding pressure plate, and the other end of each fixing screw is connected to a fixing nut. Each fixing nut is in contact with the second frame.

[0007] Preferably, the spring is a medium carbon alloy spring.

[0008] Preferably, the springs are provided in a plurality of them and are evenly distributed along the axis of the fixed plate.

[0009] Preferably, each of the pressure plates is fixedly connected to a guide post, each of the fixed plates is provided with a through hole, and one end of each guide post passes through the corresponding through hole.

[0010] Preferably, each of the pressure plates is fixedly connected to a travel limit plate, and there is a gap between each travel limit plate and the corresponding fixed plate.

[0011] Preferably, each of the fixing screws is connected to an anti-loosening nut at the other end, and a spring washer is inserted into the other end of each fixing screw, with each spring washer located between the corresponding anti-loosening nut and fixing nut.

[0012] Preferably, each of the pressure plates is connected to an indicating mechanism, the indicating mechanism including a fixed base, the fixed base being fixedly connected to the pressure plate, a measuring scale being inserted into the fixed base, and a fixing screw being connected to the fixed base, the fixing screw passing through the measuring scale.

[0013] Preferably, the fixing seat and the pressure plate are an integral structure.

[0014] The compact plate heat exchanger proposed in this utility model has the following advantages:

[0015] During the heat exchange process, the metal plates heat up and expand. The expanded metal plates compress the first frame and the gasket. The first frame compresses the pressure plate, and the pressure plate compresses the spring. The compression of the spring increases to maintain a constant pressure. When the temperature drops, the spring rebounds to compensate for the contraction. The elastic clamping force it provides can remain constant, so that the gasket always works in the elastic deformation range. This reduces the risk of gasket failure due to overpressure hardening or stress relaxation, and avoids gasket breakage caused by excessively tight bolts due to thermal deformation, thereby preventing leakage. Attached Figure Description

[0016] Figure 1 This utility model provides a structural schematic diagram of a compact plate heat exchanger. Figure 1 ;

[0017] Figure 2 This utility model provides a structural schematic diagram of a compact plate heat exchanger. Figure 2 ;

[0018] Figure 3 This is a cross-sectional structural schematic diagram of a compact plate heat exchanger proposed in this utility model;

[0019] Figure 4 This is a schematic diagram of the connection between the fixed plate and the pressure plate in a compact plate heat exchanger proposed in this utility model.

[0020] In the diagram: 1. First frame; 2. Second frame; 3. Metal plate; 4. Fixing screw; 5. Fixing plate; 6. Pressure plate; 7. Spring; 8. Fixing nut; 9. Guide post; 10. Through hole; 11. Travel limit plate; 12. Anti-loosening nut; 13. Spring washer; 14. Indicating mechanism; 141. Fixing base; 142. Measuring ruler; 143. Fixing screw. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1: Refer to Figure 1-4 A compact plate heat exchanger includes a first frame 1 and a second frame 2, the second frame 2 being slidably inserted into the first frame 1. A plurality of metal plates 3 are disposed between the first frame 1 and the second frame 2. A plurality of fixing screws 4 are inserted between the first frame 1 and the second frame 2. A fixing plate 5 is fixedly connected to one end of each fixing screw 4. A pressure plate 6 is slidably connected to each fixing screw 4, and each pressure plate 6 is in contact with the first frame 1. A spring 7, which is a medium carbon alloy spring, is fixedly connected to each fixing plate 5. The spring 7 has a plurality of... Furthermore, the springs are evenly distributed along the axis of the fixed plate 5. One end of each spring 7 is fixedly connected to the corresponding pressure plate 6. The other end of each fixed screw 4 is connected to a fixed nut 8. Each fixed nut 8 is in contact with the second frame 2. Each pressure plate 6 is fixedly connected to a guide post 9. Each fixed plate 5 has a through hole 10. One end of each guide post 9 passes through the corresponding through hole 10. Each pressure plate 6 is fixedly connected to a travel limit plate 11. Each travel limit plate 11 is spaced from the corresponding fixed plate 5.

[0023] Work process:

[0024] Rotate the fixing nut 8 to move it along the length of the fixing screw 4. When the fixing screw 4 moves a certain distance with the fixing nut 8 and comes into contact with the second frame 2, continue to rotate the fixing nut 8 to pull the fixing screw 4 through the thread drive. At this time, the fixing screw 4 further pulls the fixing plate 5. The fixing plate 5 drives the pressure plate 6 to move towards the first frame 1 through the spring 7. During this process, the pressure plate 6 synchronously pulls the guide column 9 to move. The guide column 9 is limited by the through hole 10 to ensure that the pressure plate 6 moves smoothly along the set path.

[0025] When the pressure plate 6 comes into contact with the first frame 1, the first frame 1 provides support and limits the pressure plate 6. At this time, the fixing plate 5 compresses the spring 7 during continuous movement, causing the spring 7 to undergo elastic deformation. The elastic force stored in the spring 7 acts in the opposite direction on the pressure plate 6, pushing it to apply a squeezing force to the first frame 1. With the cooperation of the second frame 2 and the spring 7, the metal plate 3 is stably clamped and fixed.

[0026] During the heat exchange process, the metal plate 3 heats up and expands. The expanded metal plate 3 compresses the first frame 1 and the gasket. The first frame 1 compresses the pressure plate 6, and the pressure plate 6 compresses the spring 7. The compression of the spring 7 increases to maintain constant pressure. When cooling down, the spring 7 rebounds to compensate for the shrinkage. The elastic clamping force it provides can remain constant, so that the gasket always works in the elastic deformation range, reducing the risk of gasket failure due to overpressure hardening or stress relaxation, and avoiding gasket breakage caused by excessively tight bolt fixing due to thermal deformation, thereby preventing leakage.

[0027] Example 2: After the fixing screw 4 is locked in place by the fixing nut 8, fluid pulsation or equipment vibration causes the fixing nut 8 to gradually rotate and unscrew, thereby causing the spring 7 to loosen. (Refer to...) Figure 1 As another preferred embodiment of this utility model, the difference from embodiment 1 is that the other end of each fixing screw 4 is connected to an anti-loosening nut 12, and the other end of each fixing screw 4 is inserted with a spring washer 13. Each spring washer 13 is located between the corresponding anti-loosening nut 12 and fixing nut 8. The anti-loosening nut 12 is connected to the fixing screw 4. The anti-loosening nut 12 squeezes the fixing nut 8 through the spring washer 13, thereby preventing the fixing nut 8 from rotating and unscrewing, and thus preventing the spring 7 from loosening.

[0028] Example 3: When the spring 7 presses the pressure plate 6, after the spring 7 is compressed, the distance between the fixed plate 5 and the pressure plate 6 cannot be controlled, thus the degree of compression of the spring 7 cannot be controlled. (Refer to...) Figure 4 As another preferred embodiment of this utility model, the difference from embodiment 1 is that each pressure plate 6 is connected to an indicating mechanism 14. The indicating mechanism 14 includes a fixed seat 141, which is fixedly connected to the pressure plate 6. The fixed seat 141 and the pressure plate 6 are an integral structure. A measuring ruler 142 is inserted into the fixed seat 141, and a fixing screw 143 is connected to the fixed seat 141. The fixing screw 143 passes through the measuring ruler 142. When the fixed plate 5 moves towards the pressure plate 6, the measuring ruler 142 is located outside the fixed plate 5 to measure the distance between the fixed plate 5 and the pressure plate 6, thereby controlling the degree of compression of the spring 7.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A compact plate heat exchanger, comprising a first frame (1) and a second frame (2), wherein the second frame (2) is slidably inserted into the first frame (1), and a plurality of fixing screws (4) are inserted between the first frame (1) and the second frame (2), characterized in that, in: Each of the fixing screws (4) is fixedly connected to a fixing plate (5) at one end, and a pressure plate (6) is slidably connected to each fixing screw (4). Each pressure plate (6) is in contact with the first frame (1). Each fixing plate (5) is fixedly connected to a spring (7). One end of each spring (7) is fixedly connected to the corresponding pressure plate (6). The other end of each fixing screw (4) is connected to a fixing nut (8). Each fixing nut (8) is in contact with the second frame (2).

2. The compact plate heat exchanger according to claim 1, characterized in that, The spring (7) is a medium carbon alloy spring.

3. The compact plate heat exchanger according to claim 2, characterized in that, The springs (7) are provided in several portions and are evenly distributed along the axis of the fixed plate (5).

4. The compact plate heat exchanger according to claim 1, characterized in that, Each of the pressure plates (6) is fixedly connected with a guide post (9), and each of the fixed plates (5) is provided with a through hole (10). One end of each guide post (9) passes through the corresponding through hole (10).

5. The compact plate heat exchanger according to claim 4, characterized in that, Each of the pressure plates (6) is fixedly connected to a travel limit plate (11), and there is a gap between each travel limit plate (11) and the corresponding fixed plate (5).

6. The compact plate heat exchanger according to claim 1, characterized in that, Each of the fixing screws (4) is connected to an anti-loosening nut (12) at the other end, and a spring washer (13) is inserted into the other end of each of the fixing screws (4). Each spring washer (13) is located between the corresponding anti-loosening nut (12) and fixing nut (8).

7. The compact plate heat exchanger according to claim 1, characterized in that, Each of the pressure plates (6) is connected to an indicating mechanism (14), the indicating mechanism (14) includes a fixing seat (141), the fixing seat (141) is fixedly connected to the pressure plate (6), a measuring ruler (142) is inserted into the fixing seat (141), and a fixing screw (143) is connected to the fixing seat (141), the fixing screw (143) passes through the measuring ruler (142).

8. The compact plate heat exchanger according to claim 7, characterized in that, The fixing seat (141) and the pressure plate (6) are an integral structure.

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