Spiral plate heat exchanger meeting middle-high pressure sterile requirement

Abstract

The utility model provides a spiral-plate heat exchanger meeting the requirement of middle and high pressure sterility, which comprises a spiral body, a refrigerant channel and a heating medium channel which are not communicated with each other are arranged in the spiral body, and the refrigerant channel and the heating medium channel are formed by rolling two parallel heat transfer substrates. The device further comprises a pressure cylinder and a transition box. The spiral body is coaxially sleeved with the pressure cylinder, and the inner wall of the pressure cylinder is fixedly connected with the two heat transfer substrates through two sealing connecting plates arranged at the ends of the heat transfer substrates correspondingly. The number of the transition boxes is two, each transition box is fixedly arranged on the outer wall of the pressure cylinder, the top end of each transition box is connected with a connecting pipe, the connecting pipe corresponding to the refrigerant channel is a refrigerant discharging pipe, and the connecting pipe corresponding to the heating medium channel is a heating medium feeding pipe. And a refrigerant feeding pipe and a heating medium discharging pipe are arranged at the bottom end of the spiral body. According to the spiral-plate heat exchanger meeting the middle-high pressure sterile requirement, mixed flow and retention dead zones can be prevented from occurring in the cold medium channel and the heating medium channel, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of spiral plate heat exchangers, and in particular relates to a spiral plate heat exchanger that meets medium and high pressure aseptic requirements. Background Art

[0002] The spiral plate heat exchanger is made of two parallel metal plates rolled together to form two independent spiral channels. Two fluids with different temperatures exchange heat through the metal wall.

[0003] In existing technology, heat exchangers feature a heat medium inlet and a refrigerant outlet on their side walls. These two connecting pipes typically come in tangential or spiral styles. Tangentially closed pipes can lead to uneven distribution of the liquid medium entering and exiting the spiral plate heat exchanger, creating mixed flow and dead zones within the spiral plate heat exchanger, and thus fail to meet the clean, sterile operating environment requirements of the pharmaceutical and food industries. In spiral-closed pipes, the top, end, and bottom plates are all flat plates, resulting in weak pressure-bearing capacity and easy deformation. Furthermore, the spiral-shaped welds are long, making them prone to leakage. Utility Model Content

[0004] The embodiment of the utility model provides a spiral plate heat exchanger that meets the requirements of medium and high pressure aseptic conditions, and aims to solve the problem of poor practicality of the connecting pipe openings on the side walls of existing spiral plate heat exchangers.

[0005] To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: providing a spiral plate heat exchanger that meets the requirements of medium and high pressure aseptic conditions, comprising a spiral body, wherein the spiral body has a refrigerant channel and a heat medium channel that are not connected to each other, wherein the refrigerant channel and the heat medium channel are formed by rolling two parallel heat transfer substrates and are arranged in a vertical direction around the winding axis; further comprising a pressure cylinder and a transition box;

[0006] The pressure cylinder is coaxially sleeved on the outside of the spiral body, and the inner wall is fixedly connected to the two heat transfer substrates through two sealing connection plates respectively provided at the ends of the heat transfer substrates; after the pressure cylinder is connected to the spiral body, a refrigerant extension channel communicating with the refrigerant channel and a heat medium extension channel communicating with the heat medium channel are formed in the cylinder cavity;

[0007] There are two transition boxes, each of which is fixed on the outer wall of the pressure cylinder, one of which is connected to the end of the refrigerant extension channel away from the refrigerant channel, and the other is connected to the end of the heat medium extension channel away from the heat medium channel; the top of each transition box is connected to a pipe, the pipe corresponding to the refrigerant channel is a refrigerant discharge pipe, and the pipe corresponding to the heat medium channel is a heat medium feed pipe;

[0008] Wherein, a refrigerant feed pipe communicating with the refrigerant channel and a heat medium discharge pipe communicating with the heat medium channel are provided at the bottom end of the spiral body.

[0009] In a possible implementation, each of the transition boxes is a semi-cylindrical structure with a semi-circular cavity with one end being open.

[0010] In a possible implementation, the axis of each transition box is arranged along the vertical direction, and the length of each transition box in the vertical direction is equal to the length of the heat medium channel or the coolant channel in the vertical direction.

[0011] In a possible implementation, the side wall area of ​​the pressure cylinder covered by each transition box is provided with a plurality of distribution holes connected to the semicircular cavity of the transition box; and the plurality of distribution holes are evenly distributed from top to bottom.

[0012] In a possible implementation, flanges are provided on the refrigerant discharge pipe, the refrigerant feed pipe, the heat medium feed pipe, and the heat medium discharge pipe.

[0013] In a possible implementation, the refrigerant feed pipe and the heat medium discharge pipe are both located at the center of the spiral body.

[0014] In a possible implementation, a plurality of supporting legs are fixedly connected to the bottom of the pressure cylinder.

[0015] In this implementation, a pressure cylinder is provided, and the spiral body is sheathed in the cylinder cavity provided by the pressure cylinder, forming a refrigerant extension channel connected to the refrigerant channel and a heat medium extension channel connected to the heat medium channel. At the same time, the refrigerant extension channel and the heat medium extension channel are not connected to each other by being fixed by a sealing connecting plate. The provision of the pressure cylinder can ensure that a pressure-bearing shell is formed outside the spiral body, which can increase the pressure-bearing capacity and thus ensure that it can adapt to medium and high pressure working environments. The transition box connected to the refrigerant extension channel can ensure that the fluid in the refrigerant channel flows out evenly and is led out at the refrigerant discharge pipe at the top, which can avoid mixed flow and dead zone in the refrigerant channel and ensure aseptic requirements. The transition box connected to the heat medium extension channel can ensure that the fluid is evenly introduced into the heat medium channel, and also avoid mixed flow and dead zone in the heat medium channel. In addition, the two transition boxes are provided independently, which can increase their pressure-bearing capacity to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a spiral plate heat exchanger that meets medium and high pressure aseptic requirements provided by an embodiment of the present utility model;

[0017] Figure 2 A schematic top view of the spiral plate heat exchanger provided in an embodiment of the present invention that meets medium and high pressure aseptic requirements;

[0018] Figure 3 A schematic cross-sectional view of a transition box corresponding to a refrigerant channel of a spiral plate heat exchanger meeting medium and high pressure aseptic requirements provided by an embodiment of the present invention;

[0019] 10. Spiral body; 11. Heat transfer substrate; 12. Distribution holes; 13. Heat medium channel; 14. Refrigerant channel; 15. Heat medium extension channel; 16. Refrigerant extension channel; 20. Transition box; 21. Moving seat; 22. Telescopic tube; 23. Threaded rod; 24. Nut; 30. Refrigerant feed pipe; 40. Refrigerant discharge pipe; 50. Heat medium discharge pipe; 60. Heat medium feed pipe; 70. Support legs; 80. Pressure cylinder; 81. Sealing connecting plate. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Please also refer to Figure 1 and Figure 2 The spiral plate heat exchanger provided by the present invention, which meets medium- and high-pressure aseptic requirements, is now described. The spiral plate heat exchanger meeting medium- and high-pressure aseptic requirements includes a spiral body 10 having a refrigerant channel 14 and a heat medium channel 13 within the spiral body 10, which are mutually exclusive. The refrigerant channel 14 and the heat medium channel 13 are formed by rolling two parallel heat transfer substrates 11, with the winding axis arranged in a vertical direction.

[0022] The spiral plate heat exchanger meeting the medium and high pressure aseptic requirements further includes a pressure cylinder 80 and a transition box 20 .

[0023] The pressure cylinder 80 is coaxially sleeved on the outside of the spiral body 10, and the inner wall is fixedly connected to the two heat transfer substrates 11 through two sealing connecting plates 81 respectively arranged at the ends of the heat transfer substrates 11; after the pressure cylinder 80 is connected to the spiral body 10, a refrigerant extension channel 16 connected to the refrigerant channel 14 and a heat medium extension channel 15 connected to the heat medium channel 13 are formed in the cylinder cavity.

[0024] Two transition boxes 20 are provided, each fixed to the outer wall of the pressure cylinder 80. One transition box 20 is connected to the end of the refrigerant extension channel 16 away from the refrigerant channel 14, and the other transition box 20 is connected to the end of the heat medium extension channel 15 away from the heat medium channel 13. The top of each transition box 20 is connected to a pipe. The pipe corresponding to the refrigerant channel 14 is a refrigerant discharge pipe 40, and the pipe corresponding to the heat medium channel 13 is a heat medium feed pipe 60. At the bottom end of the spiral body 10 are provided a refrigerant feed pipe 30 connected to the refrigerant channel 14 and a heat medium discharge pipe 50 connected to the heat medium channel 13.

[0025] The spiral plate heat exchanger provided in this embodiment meets medium- and high-pressure aseptic requirements. Compared to the prior art, a pressure cylinder 80 is provided. The spiral body 10 is nested within the cylinder cavity provided by the pressure cylinder 80, forming a refrigerant extension channel 16 connected to the refrigerant channel 14 and a heat medium extension channel 15 connected to the heat medium channel 13. The refrigerant extension channel 16 and the heat medium extension channel 15 are fixed to each other by a sealing connecting plate 81. The provision of the pressure cylinder 80 ensures that a pressure-bearing shell is formed outside the spiral body 10, which can increase the pressure-bearing capacity and thus ensure adaptability to medium- and high-pressure working environments. The transition box 20 connected to the refrigerant extension channel 16 ensures that the fluid in the refrigerant channel 14 flows out uniformly and is discharged to the refrigerant discharge pipe 40 at the top, thereby avoiding mixed flow and dead zones in the refrigerant channel 14 and ensuring aseptic requirements. The transition box 20 connected to the heat medium extension channel 15 ensures that the fluid is evenly introduced into the heat medium channel 13, similarly avoiding mixed flow and dead zones in the heat medium channel 13. In addition, the two transition boxes 20 are independently provided, which can increase the pressure bearing capacity thereof to a certain extent.

[0026] It should be noted that the pressure cylinder 80 is usually a cylindrical cylinder with end covers provided at the top and bottom ends. The end covers need to be connected to the upper and lower ends of the spiral body 10, and the refrigerant feed pipe 30 and the heat medium discharge pipe 50 need to be fixed on the end covers at the bottom. This technology is existing technology and will not be repeated here.

[0027] In some embodiments, the transition box 20 may be configured as follows: Figure 2 The structure shown. Figure 2 Each transition box 20 has a semi-cylindrical outer structure and has a semi-circular cavity with one end being open.

[0028] The semicircular shape structure can ensure a certain pressure bearing capacity and can meet the needs of medium and high pressure. At the same time, when this structure is fixedly connected to the pressure cylinder 80 by welding, the length of the weld can be reduced and the connection is more convenient.

[0029] In some embodiments, the transition box 20 may be configured as follows: Figure 1 The structure shown. Figure 1 The axis of each transition box 20 is arranged along the vertical direction, and the length of each transition box 20 in the vertical direction is equal to the length of the heat medium channel 13 or the coolant channel 14 in the vertical direction.

[0030] The transition box 20 is arranged along the vertical direction, and the length in the vertical direction is equal to the height of the heat medium channel 13 or the refrigerant channel 14 in the vertical direction, that is, the height of the semicircular cavity can cover the refrigerant channel 14 or the heat medium channel 13, which can ensure that the fluid entering the heat medium channel 13 is evenly distributed in the vertical direction, and the fluid discharged from the refrigerant channel 14 can also be evenly distributed in the vertical direction, thereby effectively avoiding mixed flow and dead zone retention, ensuring the sterility effect, ensuring the heat exchange effect, and strong practicality.

[0031] In some embodiments, the pressure cylinder 80 may be Figure 1 The structure shown. Figure 1 Each transition box 20 covers or corresponds to the side wall area of ​​the pressure cylinder 80 and is provided with a plurality of distribution holes 12 connected to the semicircular cavity of the transition box 20; the plurality of distribution holes 12 are evenly distributed from top to bottom.

[0032] The distribution holes 12 can be easily manufactured, for example, by punching. The distribution holes 12 are evenly distributed from top to bottom on the sidewall of the pressure cylinder 80, that is, evenly arranged in the semicircular cavity. This ensures that the fluid entering the heat medium channel 13 is evenly distributed in the vertical direction, and the fluid discharged from the refrigerant channel 14 is also evenly distributed in the vertical direction, thereby avoiding mixed flow and dead zones, ensuring sterility, and further ensuring heat exchange efficiency.

[0033] In some embodiments, see Figure 1 The refrigerant feed pipe 30, the refrigerant discharge pipe 40, the heat medium feed pipe 60 and the heat medium discharge pipe 50 are all provided with flanges to facilitate the connection of the pipes.

[0034] In some embodiments, the refrigerant feed pipe 30 and the heat medium discharge pipe 50 can be made of the following materials: Figure 1 The structure shown. Figure 1 The refrigerant feed pipe 30 and the heat medium discharge pipe 50 are both located at the center of the spiral body 10 .

[0035] The refrigerant feed pipe 30 and the heat medium discharge pipe 50 are located at the bottom of the spiral body 10. This structure ensures that the refrigerant feed pipe 30 and the refrigerant discharge pipe 40 are respectively located at the two ends of the refrigerant channel 14, and the heat medium feed pipe 60 and the heat medium discharge pipe 50 are respectively located at the two ends of the heat medium channel 13. This structure ensures the counter-flow of the heat medium and the refrigerant, thereby ensuring the heat exchange effect.

[0036] In some embodiments, the pressure cylinder 80 may be formed as follows: Figure 1The structure shown. Figure 1 The bottom of the pressure cylinder 80 is fixedly connected to a plurality of support legs 70. The support legs 70 can be arranged in a ring-shaped manner around the central axis of the pressure cylinder 80 to ensure support for the pressure cylinder 80 while also reserving space for the refrigerant discharge pipe 40 and the heat medium feed pipe 60.

[0037] In some embodiments, the transition box 20 corresponding to the refrigerant channel 14 can be formed as follows: Figure 3 The structure shown. Figure 3 A movable seat 21 is provided in the transition box 20 corresponding to the refrigerant channel 14. The movable seat 21 has a through hole along the vertical direction. The top of the movable seat 21 has an annular surface, and a sealing ring is provided on the annular surface. A limit block is provided on the side wall of the movable seat 21, and the limit block is slidably engaged with the vertical long groove provided in the transition box 20. The bottom end of the movable seat 21 is connected to a telescopic tube 22, and the bottom end of the telescopic tube 22 is fixed to the bottom of the semicircular cavity in the transition box 20, and the bottom of the telescopic tube 22 is provided with a connecting port connected to the semicircular cavity in the transition box 20. A threaded rod 23 is rotatably connected to the transition box 20, and the threaded rod 23 penetrates into the semicircular cavity at the bottom end of the transition box 20, and after passing through the telescopic tube 22, it is spirally connected to the nut part 24 provided in the through hole, and the nut part 24 is fixedly connected to the inner wall of the through hole through a plurality of support rods.

[0038] The telescopic tube 22 can be formed by plugging two straight tubes with different diameters. The straight tube with a smaller diameter is inserted into the straight tube with a larger diameter, and can be sealed by a sealing ring. This technology is existing technology and will not be described in detail here.

[0039] A hand wheel is provided on the protruding end of the threaded rod 23. Rotating the threaded rod 23 ensures that the movable seat 21 can be raised and lowered. During operation, the movable seat 21 is driven downward, disengaging from the inner wall of the transition box 20. When the liquid in the refrigerant channel 14 needs to be drained, the movable seat 21 can be driven upward to abut against the inner wall of the transition box 20. Then, the refrigerant discharge pipe 40 is connected to the telescopic tube 22 through the movable seat 21, ensuring that all the fluid in the refrigerant channel 14 is completely drawn out, facilitating the draining operation.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A spiral plate heat exchanger meeting medium and high pressure aseptic requirements, comprising a spiral body having a refrigerant channel and a heat medium channel inside the spiral body, each of which is independent of the other. The refrigerant channel and the heat medium channel are formed by rolling two parallel heat transfer substrates and arranged in a vertical direction around the winding axis; characterized in that: It also includes a pressure cylinder and a transition box; The pressure cylinder is coaxially sleeved on the outside of the spiral body, and the inner wall is fixedly connected to the two heat transfer substrates through two sealing connection plates respectively provided at the ends of the heat transfer substrates; after the pressure cylinder is connected to the spiral body, a refrigerant extension channel communicating with the refrigerant channel and a heat medium extension channel communicating with the heat medium channel are formed in the cylinder cavity; There are two transition boxes, each of which is fixed on the outer wall of the pressure cylinder, one of which is connected to the end of the refrigerant extension channel away from the refrigerant channel, and the other is connected to the end of the heat medium extension channel away from the heat medium channel; the top of each transition box is connected to a pipe, the pipe corresponding to the refrigerant channel is a refrigerant discharge pipe, and the pipe corresponding to the heat medium channel is a heat medium feed pipe; Wherein, a refrigerant feed pipe communicating with the refrigerant channel and a heat medium discharge pipe communicating with the heat medium channel are provided at the bottom end of the spiral body.

2. The spiral plate heat exchanger meeting the medium and high pressure aseptic requirements according to claim 1, characterized in that: Each of the transition boxes is a semi-cylindrical structure with a semi-circular cavity with one end being open.

3. The spiral plate heat exchanger meeting the medium and high pressure aseptic requirements according to claim 2, characterized in that: The axis of each transition box is arranged along the vertical direction, and the length of each transition box in the vertical direction is equal to the length of the heat medium channel or the coolant channel in the vertical direction.

4. The spiral plate heat exchanger meeting the medium and high pressure aseptic requirements according to claim 2, characterized in that: The side wall area of ​​the pressure cylinder covered by each transition box is provided with a plurality of distribution holes connected with the semicircular cavity of the transition box; the plurality of distribution holes are evenly distributed from top to bottom.

5. The spiral plate heat exchanger meeting the medium and high pressure aseptic requirements according to any one of claims 1 to 4, characterized in that: The refrigerant discharge pipe, the refrigerant feed pipe, the heat medium feed pipe and the heat medium discharge pipe are all provided with flanges.

6. The spiral plate heat exchanger meeting the medium and high pressure aseptic requirements according to claim 5, characterized in that: The refrigerant feed pipe and the heat medium discharge pipe are both located at the center of the spiral body.

7. The spiral plate heat exchanger meeting the medium and high pressure aseptic requirements according to claim 1, characterized in that: A plurality of supporting legs are fixedly connected to the bottom of the pressure cylinder.

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