Spiral plate heat exchanger capable of preventing gas blockage

Abstract

The present application belongs to the technical field of heat exchange equipment, and particularly relates to a spiral plate heat exchanger capable of preventing gas blockage. The spiral plate heat exchanger comprises a pressure sleeve, an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are arranged at the upper end and the lower end of the pressure sleeve respectively, a spiral body is arranged in the pressure sleeve in a vertical manner, the spiral body comprises first spiral channels and second spiral channels arranged alternately, the inner spiral end and the outer spiral end of the first spiral channels are communicated with a refrigerant outlet and a refrigerant inlet respectively, the inner spiral end and the outer spiral end of the second spiral channels are communicated with a heat medium inlet and a heat medium outlet respectively, and the upper end surface of each channel of the first spiral channels is communicated with the refrigerant outlet in part so that the gas in each channel of the first spiral channels is discharged from the upper end surface thereof. The spiral plate heat exchanger can avoid vibration impact cyclic stress caused by gas blockage of the upper part of the spiral channel, and prevent equipment damage and safety accidents.

Description

Technical Field

[0001] This invention belongs to the technical field of heat exchange equipment, and specifically relates to a spiral plate heat exchanger that prevents gas blockage. Background Technology

[0002] Spiral plate heat exchangers are a new type of heat exchanger with high heat transfer efficiency and stable operation. The equipment consists of two relatively long thin metal plates, welded with spacer columns, spirally rolled around a separate axis to form a pair of spaced-apart spiral channels. A cover plate and pressure sleeve are installed on the outside of the spiral bodies. The fluids on the hot and cold sides flow within the two spiral channels for heat exchange. Spiral plate heat exchangers offer advantages such as high turbulence self-cleaning, high heat transfer efficiency, and no dead zones.

[0003] When a spiral plate heat exchanger is used as an evaporator, in some special cases, the liquid on the evaporation side will adopt a vertical spiral flow. For example, if the heat required for the evaporation of the liquid on the evaporation side comes from the condensation of the gas, i.e., a phase change process occurs on the condensation side, the condensation side usually adopts a vertical through-flow. However, due to the structural limitations of the heat exchanger itself, it is not possible for both sides of the medium to adopt through-flow, so the evaporation side can only adopt a vertical spiral flow. Alternatively, if the heat required for the evaporation of the liquid on the evaporation side comes from liquid cooling, and the liquid flow rate on the evaporation side is very small, in order to avoid requiring a large heat exchange area to meet the operating requirements, the evaporation side must also adopt a spiral flow to enhance heat exchange.

[0004] When a spiral plate heat exchanger is used as an evaporator, and the evaporation side adopts a vertical spiral flow design, the evaporated gas often encounters a problem: because it needs to flow spirally in multiple turns, it cannot flow smoothly within the equipment, and the gas becomes blocked in the channels and cannot be discharged in time. Due to its low density, the gas will accumulate in large quantities at the top of the spiral channel, thereby causing vibration, impact, and cyclic stress, resulting in equipment damage or even safety accidents. Summary of the Invention

[0005] This invention provides a spiral plate heat exchanger to prevent gas blockage, which solves the technical problem that when a spiral plate heat exchanger is used as an evaporator, the gas generated on the evaporation side can block the upper part of the spiral channel, causing equipment damage or even safety accidents.

[0006] The spiral plate heat exchanger for preventing gas blockage of the present invention includes: a pressure sleeve, an upper cover plate, and a lower cover plate.

[0007] The upper cover plate and the lower cover plate are respectively disposed at the upper and lower ends of the pressure sleeve. The pressure sleeve is provided with a refrigerant inlet and a heat transfer medium outlet. The upper cover plate is provided with a refrigerant outlet, and the lower cover plate is provided with a heat transfer medium inlet.

[0008] The pressure sleeve contains a vertically placed spiral body, which includes alternating first and second spiral channels.

[0009] The inner and outer spiral ends of the first spiral channel are connected to the refrigerant outlet and the refrigerant inlet, respectively; the inner and outer spiral ends of the second spiral channel are connected to the heat medium inlet and the heat medium outlet, respectively.

[0010] In this embodiment, a portion of the upper end face of each coil of the first spiral channel is connected to the refrigerant outlet, so that the gas in each coil of the first spiral channel can be discharged from its upper end face.

[0011] In one embodiment, the upper end face of the first spiral channel is open, and the upper end face of the second spiral channel is closed.

[0012] A connecting pad is provided between the upper cover plate and the upper end face of the spiral body, and the connecting pad is provided with a connecting hole extending vertically.

[0013] In this configuration, a portion of the upper end face of each coil of the first spiral channel is connected to the refrigerant outlet through the connecting hole, while the other portion is sealed through the bottom surface of the connecting gasket.

[0014] In one embodiment, the connecting hole includes: a central hole and a strip hole that are interconnected.

[0015] The central hole is located in the center of the connecting pad, and the strip-shaped hole extends radially from the central hole to the outer peripheral edge of the connecting pad.

[0016] The central hole is vertically opposite to the refrigerant outlet, and the strip hole is vertically opposite to the upper end face of the first spiral channel.

[0017] In one embodiment, the number of the strip holes is set to 2 to 8, and the strip holes are evenly spaced along the circumference of the connecting pad.

[0018] In one embodiment, the outer diameter of the connecting pad is less than or equal to the outer diameter of the helix.

[0019] In one embodiment, the diameter of the central hole is less than or equal to the diameter of the innermost ring of the first helical channel.

[0020] In one embodiment, the thickness of the connecting pad is set to 1 mm to 4 mm.

[0021] In one embodiment, the connecting pad is made of a metallic material.

[0022] In one embodiment, the upper end face of the second spiral channel is sealed by a welded structure.

[0023] In one embodiment, the helical body further includes a central cylinder extending in a vertical direction, the central cylinder being disposed at the center of the helical body.

[0024] The central cylinder is equipped with a baffle plate, which divides the inner cavity of the central cylinder into a first flow channel communicating with the refrigerant outlet and a second flow channel communicating with the heat medium inlet.

[0025] The inner spiral end of the first spiral channel is connected to the refrigerant outlet through the first flow channel, and the inner spiral end of the second spiral channel is connected to the heat medium inlet through the second flow channel.

[0026] Compared with the prior art, the advantages of the present invention are as follows: In the present invention, a portion of the upper end face of each loop of the first spiral channel is directly connected to the refrigerant outlet, so that the gas generated by the evaporation of the refrigerant in the first spiral channel does not need to flow through loop after loop before being discharged, but can directly flow into the refrigerant outlet from its upper end face and be discharged. This avoids the vibration and impact cyclic stress caused by some gas not being discharged in time and blocking the upper part of the first spiral channel, thus preventing equipment damage and safety accidents. Attached Figure Description

[0027] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the spiral plate heat exchanger in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the connecting pad in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram showing the positions of the connecting pad and the spiral channel in an embodiment of the present invention.

[0031] Figure label:

[0032] 1. Pressure sleeve; 2. Upper cover plate; 3. Lower cover plate; 4. First spiral channel;

[0033] 5. Second spiral channel; 6. Connecting pad; 7. Central cylinder; 8. Partition plate;

[0034] 101. Refrigerant import; 102. Refrigerant export; 103. Heat transfer fluid import; 104. Heat transfer fluid export;

[0035] 21. Connecting groove; 61. Center hole; 62. Strip hole; 701. Connecting hole. Detailed Implementation

[0036] The invention will now be further described with reference to the accompanying drawings.

[0037] like Figure 1-3 As shown, the spiral plate heat exchanger for preventing gas blockage of the present invention includes: a pressure sleeve 1, an upper cover plate 2, and a lower cover plate 3. The upper cover plate 2 and the lower cover plate 3 are respectively disposed at the upper and lower ends of the pressure sleeve 1. The pressure sleeve 1 is provided with a refrigerant inlet 101 and a heat medium outlet 104, the upper cover plate 2 is provided with a refrigerant outlet 102, and the lower cover plate 3 is provided with a heat medium inlet 103. A vertically placed spiral body is disposed inside the pressure sleeve 1. The spiral body includes alternating first spiral channels 4 and second spiral channels 5. The inner spiral end and the outer spiral end of the first spiral channel 4 are respectively connected to the refrigerant outlet 102 and the refrigerant inlet 101, and the inner spiral end and the outer spiral end of the second spiral channel 5 are respectively connected to the heat medium inlet 103 and the heat medium outlet 104. A portion of the upper end face of each coil of the first spiral channel 4 is connected to the refrigerant outlet 102, so that the gas in each coil of the first spiral channel 4 can be discharged from its upper end face.

[0038] In this invention, a portion of the upper end face of each loop of the first spiral channel 4 is directly connected to the refrigerant outlet 102, so that the gas generated by the evaporation of the refrigerant in the first spiral channel 4 does not need to flow through loop after loop before being discharged, but can directly flow into the refrigerant outlet 102 from its upper end face and be discharged, thereby avoiding the vibration and impact cyclic stress caused by gas blockage in the spiral channel, preventing equipment damage and safety accidents.

[0039] Example 1

[0040] In the spiral plate heat exchanger of this embodiment, the upper end face of the first spiral channel 4 is open, and the upper end face of the second spiral channel 5 is closed. A connecting gasket 6 is provided between the upper cover plate 2 and the upper end face of the spiral body, and a connecting hole 701 is provided on the connecting gasket 6 that runs vertically through it. Among them, a portion of the upper end face of each coil of the first spiral channel 4 is connected to the refrigerant outlet 102 through the connecting hole 701, and the other portion is sealed through the bottom surface of the connecting gasket 6.

[0041] In this embodiment, by providing a connecting pad 6 with a connecting hole 701, a portion of the upper end face of each loop of the first spiral channel 4 is directly connected to the refrigerant outlet 102, so that the gas generated by the evaporation of the refrigerant in the first spiral channel 4 does not need to flow through loop after loop before being discharged, but can directly flow into the refrigerant outlet 102 through the connecting hole 701 on the connecting pad 6 and be discharged.

[0042] In other words, in this embodiment, by setting a connecting pad 6 between the upper cover plate 2 and the upper end of the spiral body, a gas channel is formed between the corresponding position of the upper end face of each turn of the first spiral channel 4 and the refrigerant outlet 102.

[0043] It should be noted that the first spiral channel 4 is used for the flow of refrigerant, and the upper end of the second spiral channel 5 is closed to prevent the heat medium and refrigerant from mixing.

[0044] Furthermore, the lower end face of the first spiral channel 4 is closed, while the lower end face of the second spiral channel 5 is open, and the lower end face of the second spiral channel 5 is sealed by the lower cover plate 3. In this way, the fluids between the two spiral channels will not mix, and both have an open end, thus enabling the spiral channels to be cleaned. Specifically, the upper end face of the second spiral channel 5 and the lower end face of the first spiral channel 4 are both sealed by a welded structure.

[0045] Preferably, the connecting hole 701 includes a central hole 61 and a strip-shaped hole 62 that communicate with each other. The central hole 61 is located in the center of the connecting pad 6, and the strip-shaped hole 62 extends radially from the central hole 61 to the outer peripheral edge of the connecting pad 6. The central hole 61 is vertically opposite to the refrigerant outlet 102, and the strip-shaped hole 62 is vertically opposite to the upper end face of the first spiral channel 4. Thus, the gas in the upper part of the first spiral channel 4 passes sequentially through the strip-shaped hole 62 and the central hole 61 before entering the refrigerant outlet 102.

[0046] Specifically, the number of strip holes 62 is set to 2 to 8, and the strip holes 62 are evenly spaced along the circumference of the connecting pad 6. Preferably, the number of strip holes 62 is set to 4, such as... Figure 2 As shown in the image.

[0047] The connecting pad 6 has multiple evenly arranged strip holes 62, which allow the gas accumulated on the upper part of each spiral channel 4 to be discharged from multiple points on the upper end face of each spiral channel. As the evaporated gas spirals and flows in the heat exchanger, some gas cannot be discharged in time and gets stuck in the channel. Due to the low gas density, this part of the gas gets stuck at the top of the spiral channel. At this time, the gas can be discharged directly to the outlet through the strip holes of the connecting pad at the top of the equipment.

[0048] Specifically, the outer diameter of the connecting pad 6 is less than or equal to the outer diameter of the spiral body, and the diameter of the central hole 61 is less than or equal to the diameter of the innermost ring of the first spiral channel.

[0049] Specifically, the thickness of the connecting gasket 6 is set to 1mm to 4mm, for example, 1mm, 2mm, 3mm or 4mm. The thickness of the connecting gasket 6 is also the depth of the connecting hole 701. If the thickness of the connecting gasket 6 is too small, the depth of the connecting hole 701 will be too small, resulting in insufficient gas flow space and poor ventilation. If the thickness of the connecting gasket 6 is too large, its rigidity will be too high, which will affect the seal between the upper cover plate 2 and the pressure sleeve 1.

[0050] Specifically, the connecting pad 6 is made of a metal material, such as stainless steel.

[0051] It should be noted that by connecting the upper end face of each loop of the first spiral channel 4 through the connecting plate 6 to the gas channel of the refrigerant outlet 102, it is easy to implement and can directly modify the existing detachable spiral plate heat exchanger, which is beneficial to saving costs.

[0052] Example 2

[0053] This embodiment is used to describe the differences from the previous embodiment; the similarities will not be repeated.

[0054] In this embodiment, the spiral body further includes a central cylinder 7 extending vertically. The central cylinder 7 is disposed in the center of the spiral body, and a partition 8 is provided inside the central cylinder 7. The partition 8 divides the inner cavity of the central cylinder 7 into a first flow channel communicating with the refrigerant outlet 102 and a second flow channel communicating with the heat medium inlet 103. The inner spiral end of the first spiral channel 4 is connected to the refrigerant outlet 102 through the first flow channel, and the inner spiral end of the second spiral channel 5 is connected to the heat medium inlet 103 through the second flow channel.

[0055] In this embodiment, when a gas passage between the upper end face of each loop of the first spiral channel 4 and the refrigerant outlet 102 is constructed using a connecting pad 6 with a connecting hole 701, the central hole 61 on the connecting pad 6 should be slightly smaller than the diameter of the inner cavity of the central cylinder 7.

[0056] Specifically, the first spiral channel 4 and the second spiral channel 5 are formed by rolling two spaced-apart heat exchange plates. The lower end face of the first spiral channel 4 and the upper end face of the second spiral channel 5 are sealed by welding. The inner spiral ends of the two heat exchange plates are connected to the outer wall of the central cylinder 7, and the outer spiral ends of the two heat exchange plates are connected to the inner wall of the pressure sleeve 1.

[0057] Furthermore, the central cylinder 7 is provided with evenly arranged flow holes, and the first spiral channel 4 and the second spiral channel 5 are respectively connected to the first flow channel and the second flow channel through the corresponding flow holes.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] The terms "upper" and "lower" used in this invention are defined in their usual sense. For example, referring to the direction of gravity, the direction of gravity is downward, and the opposite direction is upward. Similarly, "upper" is the top, and "lower" is the bottom. "Inner" and "outer" refer to the inner and outer contours of each component itself, and are only used for clarity of description, not to limit the scope of the invention. Changes or adjustments to these relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0060] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A spiral plate heat exchanger for preventing gas blockage, characterized in that, include: Pressure sleeve, upper cover plate and lower cover plate, The upper cover plate and the lower cover plate are respectively disposed at the upper and lower ends of the pressure sleeve. The pressure sleeve is provided with a refrigerant inlet and a heat transfer medium outlet. The upper cover plate is provided with a refrigerant outlet, and the lower cover plate is provided with a heat transfer medium inlet. The pressure sleeve contains a vertically placed spiral body, which includes alternating first and second spiral channels. The inner and outer spiral ends of the first spiral channel are connected to the refrigerant outlet and the refrigerant inlet, respectively; the inner and outer spiral ends of the second spiral channel are connected to the heat medium inlet and the heat medium outlet, respectively. In this embodiment, a portion of the upper end face of each coil of the first spiral channel is connected to the refrigerant outlet, so that the gas in each coil of the first spiral channel is discharged from its upper end face. The upper end face of the first spiral channel is open, and the upper end face of the second spiral channel is closed; A connecting pad is provided between the upper cover plate and the upper end face of the spiral body, and a connecting hole is provided on the connecting pad in the vertical direction. In this configuration, a portion of the upper end face of each coil of the first spiral channel is connected to the refrigerant outlet through the connecting hole, while the other portion is sealed through the bottom surface of the connecting gasket.

2. The spiral plate heat exchanger according to claim 1, characterized in that, The connecting holes include: a central hole and a strip hole that are interconnected. The central hole is located in the center of the connecting pad, and the strip-shaped hole extends radially from the central hole to the outer peripheral edge of the connecting pad. The central hole is vertically opposite to the refrigerant outlet, and the strip hole is vertically opposite to the upper end face of the first spiral channel.

3. The spiral plate heat exchanger according to claim 2, characterized in that, The number of the strip holes is set to 2 to 8, and the strip holes are evenly spaced along the circumference of the connecting pad.

4. The spiral plate heat exchanger according to claim 1, characterized in that, The outer diameter of the connecting pad is less than or equal to the outer diameter of the helix.

5. The spiral plate heat exchanger according to claim 2, characterized in that, The diameter of the central hole is less than or equal to the diameter of the innermost ring of the first spiral channel.

6. The spiral plate heat exchanger according to any one of claims 1-5, characterized in that, The thickness of the connecting pad is set to 1 mm to 4 mm.

7. The spiral plate heat exchanger according to any one of claims 1-5, characterized in that, The connecting pad is made of metal.

8. The spiral plate heat exchanger according to any one of claims 1-5, characterized in that, The upper end face of the second spiral channel is sealed by a welded structure.

9. The spiral plate heat exchanger according to any one of claims 1-5, characterized in that, The helical body also includes a central cylinder extending in a vertical direction. The central cylinder is located at the center of the helical body. The central cylinder is equipped with a baffle plate, which divides the inner cavity of the central cylinder into a first flow channel communicating with the refrigerant outlet and a second flow channel communicating with the heat medium inlet. The inner spiral end of the first spiral channel is connected to the refrigerant outlet through the first flow channel, and the inner spiral end of the second spiral channel is connected to the heat medium inlet through the second flow channel.

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