Plate-shaped heat exchanger

Abstract

Provided is a plate-shaped heat exchanger. The plate-shaped heat exchanger includes: a heat transfer plate assembly including a plurality of heat transfer plates stacked on each other; a first cover coupled to one surface of the heat transfer plate assembly and capable of allowing the first fluid and the second fluid to flow in and out from the outside; and a second cover coupled to the other surface of the heat transfer plate assembly. The plurality of heat transfer plates includes: a first heat transfer plate having a first heat transfer region in which a first flow path through which a first fluid flows is formed; and second heat transfer plates alternately stacked and joined with the first heat transfer plates, the second heat transfer plates having a second heat transfer region in which a second flow path for the flow of a second fluid is formed, each of the first heat-conducting plate and the second heat-conducting plate is provided with a dead zone in which the inflow of the first fluid and the inflow of the second fluid are blocked; the second cover is provided with a cover hole into which gas can be injected from the outside, the dead zone is provided with at least one dead zone hole, and the gas injected into the cover hole flows into the dead zone hole.

Description

Technical Field

[0001] This invention relates to a plate heat exchanger. Background Technology

[0002] An air conditioner is a device that cools or heats an indoor space through the compression, condensation, expansion, and evaporation of refrigerant.

[0003] When heating indoors, the indoor heat exchanger in the indoor unit acts as a condenser through which high-temperature, high-pressure refrigerant passes. Conversely, when heating indoors, the outdoor heat exchanger in the outdoor unit acts as an evaporator through which low-temperature, low-pressure refrigerant passes.

[0004] Conversely, during indoor cooling, the indoor heat exchanger functions as an evaporator. Furthermore, during indoor cooling, the outdoor heat exchanger functions as a condenser.

[0005] Such heat exchangers are constructed in the form of plate heat exchangers.

[0006] Plate heat exchangers have the advantage of excellent heat transfer efficiency between fluids with different temperatures, such as a high-temperature first fluid (e.g., water) and a low-temperature second fluid (e.g., refrigerant).

[0007] However, such plate heat exchangers have the following problems.

[0008] During the evaporation process where a low-temperature second fluid (e.g., a refrigerant) takes away heat from a high-temperature first fluid (e.g., water), the first fluid may freeze near the inlet and outlet of the second fluid flow, potentially causing the plate heat exchanger to crack. This results in potential damage to the plate heat exchanger.

[0009] In particular, this problem often occurs in the non-flow area, in the area surrounding the inflow and outflow of the second fluid at low temperatures where the first fluid stagnates and does not flow.

[0010] For example, a dead zone, where no fluid flows, is formed in the non-flow area of ​​a plate heat exchanger. The dead zone is mainly formed around the second fluid inlet and the second fluid outlet, and is designed to improve pressure resistance, performance, and efficiency. Furthermore, the periphery of the dead zone can be brazed.

[0011] However, if poor brazing occurs around the dead zone, gaps may form between the dead zone and the first flow path of the first fluid (i.e., water). Therefore, when the first fluid flows into the dead zone where there is no fluid flow, it may freeze and crack in the dead zone due to the low temperature of the second fluid flowing towards the periphery of the dead zone. As a result, the plate heat exchanger may suffer serious problems such as breakage, leading to a significant reduction in reliability.

[0012] Therefore, in order to reduce the possibility of plate heat exchangers freezing and cracking and improve their quality reliability, a technical solution that can check the airtightness of dead zones is needed.

[0013] As a prior art document related to this invention, WO 2020-188690 A1 (hereinafter, prior art 1) discloses a plate heat exchanger and a heat pump device having the plate heat exchanger.

[0014] The plate heat exchanger disclosed in existing document 1 relates to a technique that can detect in advance the inflow of water into the cavity (i.e., the dead zone) and its retention, where the water in the cavity freezes and the heat-conducting plate breaks.

[0015] However, while existing literature 1 can confirm whether water has penetrated into the cavity (i.e., the dead zone) due to poor brazing, it has the drawback that such confirmation cannot prevent the inflow of external air. In other words, after inspection, moisture contained in the outside air may penetrate into the interior, thus posing a possibility of icing or freezing cracking.

[0016] Furthermore, in existing literature 1, a communication port is formed on the flange of a thin heat-conducting plate during brazing. This communication port, being a location where external air can directly contact the plate, presents a serious problem: when the thin, weak heat-conducting plate corrodes, fluid may flow directly to the outside.

[0017] As a prior art document related to this invention, KR 10-1314906B1 (hereinafter, prior art 2) discloses a plate heat exchanger and a method for manufacturing the same.

[0018] The plate heat exchanger disclosed in existing literature 2 only proposes a solution to improve the flow path to increase heat exchange efficiency, but does not address the issue of preventing water (i.e., the first fluid) from freezing and cracking around the refrigerant (i.e., the second fluid).

[0019] Furthermore, existing literature 2 makes no mention of checking the airtightness of the dead zone in order to prevent water (i.e., the first fluid) from flowing into the dead zone due to poor brazing and causing freezing and cracking.

[0020] As a prior art document related to this invention, KR 10-2443308B1 (hereinafter, prior art document 3) discloses an antifreeze plate heat exchanger.

[0021] In the antifreeze plate heat exchanger disclosed in existing document 3, the joint strength is improved by welding the corner areas of the stacked heat-conducting plates with joint reinforcements, and a structure that can improve the flowability of fluid or refrigerant is provided in the corner areas of each heat-conducting plate, thereby preventing freezing cracks caused by icing.

[0022] However, in existing document 3, there is no mention of injecting gas into the dead zone holes located in the corner area after welding the heat-conducting plate to check for poor welding joints before leaving the factory.

[0023] Existing technical documents

[0024] Patent documents

[0025] WO 2020-188690 A1

[0026] KR 10-1314906B1

[0027] KR 10-2443308B1 Summary of the Invention

[0028] The purpose of this invention is to provide a plate-shaped heat exchanger that forms a cover hole on the cover side to receive the injection of external gas, and forms a dead zone hole in the dead zone on the heat-conducting plate side that communicates with the cover hole, allowing gas to flow into the interior of the dead zone, thereby confirming whether the gas flows between the dead zone and the flow path of the first fluid (i.e., water), thus enabling safe and rapid inspection of the airtightness of the dead zone after brazing.

[0029] Another object of the present invention is to provide a plate heat exchanger that prevents moisture contained in the outside air from flowing into the heat-conducting plate or the interior of the dead zone by sealing the cover hole after the airtightness check of the dead zone, thereby preventing icing and freezing cracking caused by external moisture.

[0030] Another object of the present invention is to provide a plate heat exchanger that does not form a hole for injecting external gas in a thin and low-strength heat-conducting plate, but injects external gas by providing a cover hole in a thick and high-strength cover. This results in excellent machinability of the gas injection hole, allows the use of various sealing methods, and prevents fluid leakage to the outside caused by corrosion of the heat-conducting plate in advance.

[0031] The objectives of this invention are not limited to those mentioned above. Other objectives and advantages of this invention not mentioned can be understood through the following description and can be further clearly understood through embodiments of this invention. Furthermore, it will be readily apparent that the objectives and advantages of this invention can be achieved through the means and combinations thereof given in the claims.

[0032] One aspect of the plate heat exchanger of the present invention includes a heat-conducting plate joint, a first cover and a second cover, wherein a cover hole is formed in the second cover.

[0033] In one embodiment, the plate heat exchanger can receive gas injection from the outside through a cover hole provided in the second cover.

[0034] The heat-conducting plates can be stacked inside the first and second covers.

[0035] Dead zone holes can be formed by penetrating the dead zone of the heat-conducting plate.

[0036] Inspection gas can be injected from the outside through the cap hole. The injected gas can flow into the interior through a dead zone hole that communicates with the cap hole. Thus, after brazing, the airtightness between the dead zone and the flow path of water (i.e., the first fluid) can be checked, and brazing defects can be easily checked before the product leaves the factory.

[0037] The plate heat exchanger includes a heat-conducting plate joint, a first cover, and a second cover.

[0038] The heat-conducting plate assembly may include a plurality of heat-conducting plates stacked on top of each other, which cause a first fluid and a second fluid with a temperature lower than the first fluid to flow to their respective heat-conducting regions, so as to exchange heat between the first fluid and the second fluid.

[0039] The first cover can be attached to one side of the heat-conducting plate assembly. The first cover can be configured to allow a first fluid to flow in and out from the outside. Additionally, the first cover can be configured to allow a second fluid to flow in and out from the outside.

[0040] The second cover can be attached to the other side of the heat-conducting plate assembly.

[0041] According to one embodiment, the heat-conducting plate assembly may include a first heat-conducting plate and a second heat-conducting plate.

[0042] The first heat-conducting plate may have a first heat-conducting region having a first flow path for the flow of the first fluid.

[0043] The second heat-conducting plate may be stacked and joined alternately with the first heat-conducting plate. The second heat-conducting plate may have a second heat-conducting region forming a second flow path for the flow of the second fluid.

[0044] Each of the first and second heat-conducting plates may be provided with a non-flow path region formed outside the first and second heat-conducting regions, and a dead zone in which the inflow of the first and second fluids is blocked.

[0045] The second cover may be provided with a cover hole that allows gas to be injected from the outside.

[0046] A dead zone hole communicating with the cover hole can be provided in the dead zone. The dead zone hole formed in the dead zone of the heat-conducting plate allows inspection gas injected through the cover hole to flow inward. Thus, according to the present invention, the airtightness of the dead zone can be checked using the cover hole and the dead zone hole.

[0047] According to one embodiment, the first cover allows the first fluid to flow in from the outside and allows the first fluid, after heat exchange, to flow out to the outside.

[0048] In addition, the first cover can use a different path than the first fluid to allow the second fluid to flow in from the outside and to allow the second fluid, after heat exchange, to flow out to the outside.

[0049] According to one embodiment, the cover hole can be formed through the thickness direction of the second cover.

[0050] According to one embodiment, the cover hole and the dead zone hole can be formed facing each other at the same location. Therefore, gas injected through the cover hole can quickly flow into the interior of the dead zone through the dead zone hole, thereby shortening the inspection time.

[0051] According to one embodiment, the cover hole and the dead zone hole can have a circular shape with the same diameter as each other.

[0052] According to one embodiment, the centers of the cover hole and the dead zone hole can be aligned. Therefore, gas injected through the cover hole can rapidly flow into the interior of the dead zone through the dead zone hole.

[0053] According to one embodiment, the centers of the cover hole and the dead zone hole can be aligned, in which case the diameter of the cover hole can be larger than the diameter of the dead zone hole. This allows for smooth gas injection through the larger diameter cover hole. Furthermore, the second cover with the cover hole can be formed to be stronger and thicker than the heat-conducting plate with the dead zone hole. Therefore, the diameter of the cover hole can be larger than the diameter of the dead zone hole.

[0054] According to one embodiment, the first and second heat-conducting plates can be made of a first material. The second cover can be made of a second material. The strength of the second material can be higher than that of the first material. This facilitates the formation of holes for gas injection, and because the holes are formed in the second cover, which has a higher strength than the first and second heat-conducting plates, the risk of fluid flowing internally leaking to the outside can be reduced.

[0055] According to one embodiment, the first heat-conducting plate and the second heat-conducting plate may have a first thickness. The second cover may have a second thickness. The second thickness may be greater than the first thickness.

[0056] According to one embodiment, the first and second heat-conducting plates can be made of SUS316L material. The second cover can be made of SUS304. Because SUS304 has a relatively high chromium and nickel content, it exhibits excellent heat resistance, wear resistance, and weldability. Conversely, compared to SUS304, SUS316L has a higher molybdenum content, resulting in enhanced corrosion resistance, making it suitable for use in environments with high corrosion potential.

[0057] According to a preferred embodiment, the second cover may have a thickness of 5 to 7 times that of the first and second heat-conducting plates. Thus, when an injection hole for directly receiving gas from the outside is formed on the cover, i.e., the second cover, the machining and forming of the hole becomes easier, and it can be sealed by various sealing methods, such as a plug for physical fastening, a seal, or a welding method.

[0058] According to one embodiment, a plurality of cover holes may be provided at different locations. A number of dead zone holes may be provided corresponding to the number of the plurality of cover holes. The plurality of cover holes and dead zone holes may each be formed facing each other at the same location.

[0059] According to one embodiment, the first cover may include a first fluid external inflow portion that allows a first fluid to flow from the outside of the first cover into the heat-conducting plate joint.

[0060] Additionally, the first cover may include a first fluid external outlet portion from which a first fluid, causing the heat exchange to terminate, flows from the heat-conducting plate joint to the outside of the first cover.

[0061] Additionally, the first cover may include a second fluid external inflow portion that allows a second fluid to flow from the outside of the first cover into the heat-conducting plate joint.

[0062] Additionally, the first cover may include a second fluid external outlet portion from which a second fluid, causing the heat exchange to terminate, flows from the heat-conducting plate joint to the outside of the first cover.

[0063] According to one embodiment, the first heat-conducting plate may include one end located along the length of the first heat-conducting region and connected to the first flow path, forming a first fluid inflow portion of the first heat-conducting plate into which the first fluid flows.

[0064] In addition, the first heat-conducting plate may include the other end located in the length direction of the first heat-conducting region and connected to the first flow path, so that the first fluid flows out of the first heat-conducting plate first fluid outflow portion.

[0065] In addition, the first heat-conducting plate may also include a first heat-conducting plate second fluid inflow portion that is spaced apart from the first fluid outflow portion of the first heat-conducting plate in the width direction of the first heat-conducting region and is isolated from the first flow path, allowing the second fluid to flow into the first heat-conducting plate.

[0066] In addition, the first heat-conducting plate may also include a first heat-conducting plate second fluid outflow portion that is spaced apart from the first fluid inflow portion of the first heat-conducting plate in the width direction of the first heat-conducting region and is isolated from the first flow path, so that the second fluid flows out.

[0067] According to one embodiment, the dead zone hole can penetrate along the thickness direction through the dead zone that is disposed close to the second fluid inflow portion and the second fluid outflow portion of the first heat-conducting plate.

[0068] According to one embodiment, the second heat-conducting plate may include the other end located in the length direction of the second heat-conducting region and connected to the second flow path, so that the second fluid flows into the second heat-conducting plate second fluid inflow portion.

[0069] Additionally, the second heat-conducting plate may include one end located along the length of the second heat-conducting region and connected to the second flow path, forming a second fluid outflow portion of the second heat-conducting plate.

[0070] Additionally, the second heat-conducting plate may also include a second heat-conducting plate first fluid inflow portion that is spaced apart from the second fluid outflow portion of the second heat-conducting plate in the width direction of the second heat-conducting region and is isolated from the second flow path, allowing the first fluid to flow into the second heat-conducting plate.

[0071] Additionally, the second heat-conducting plate may also include a second heat-conducting plate first fluid outflow portion that is spaced apart from the second fluid inflow portion of the second heat-conducting plate in the width direction of the second heat-conducting region and is isolated from the second flow path, allowing the first fluid to flow out.

[0072] According to one embodiment, the dead zone hole can penetrate along the thickness direction through the dead zone, which is disposed close to the second fluid inflow portion and the second fluid outflow portion of the second heat-conducting plate.

[0073] According to one embodiment, when stacking the first heat-conducting plate and the second heat-conducting plate, the dead zones respectively disposed on the first heat-conducting plate and the second heat-conducting plate can overlap and combine with each other.

[0074] At this time, the dead zone holes respectively provided in the dead zones of the first heat-conducting plate and the second heat-conducting plate can be formed facing each other at the same position and communicate with each other along the stacking direction.

[0075] According to one embodiment, a first flange may be provided along the edge of the first heat-conducting plate. Additionally, the corners of the first heat-conducting plate may have an arc shape. In this case, the dead zone hole may be configured close to the arc-shaped corner. Furthermore, the dead zone hole may be configured close to the first flange surrounding the arc-shaped corner.

[0076] According to one embodiment, a second flange may be provided along the edge of the second heat-conducting plate. Additionally, the corners of the second heat-conducting plate may have an arc shape. In this case, the dead zone hole may be configured close to the arc-shaped corner. Furthermore, the dead zone hole may be configured close to the second flange surrounding the arc-shaped corner.

[0077] According to one embodiment, during a dead zone airtightness check, if gas is injected into the cover hole, the injected gas flows into the dead zone through the dead zone hole. The airtightness of the dead zone is checked by confirming whether the flowing gas flows between the dead zone and the first flow path. Thus, the airtightness of the dead zone can be checked, and based on the airtightness check results, brazing defects around the dead zone can be detected.

[0078] According to one embodiment, the device may further include a plug that seals the cap hole. After a dead zone airtightness check, the plug is engaged with the cap hole to block it, thereby preventing external moisture from entering the interior of the cap hole.

[0079] According to one embodiment, a welded seal may also be included to seal the cover hole. After the airtightness check of the dead zone, the cover hole is welded with welding material to prevent external moisture from entering the interior of the cover hole.

[0080] According to one embodiment, it may also include a sealing portion that seals the cover hole, and after the airtightness check of the dead zone, a sealing material is injected into the cover hole to prevent external moisture from intruding into the interior of the cover hole.

[0081] Another aspect of the plate heat exchanger of the present invention includes a heat-conducting plate assembly and a cover, wherein a cover hole is formed in the cover.

[0082] One embodiment of the plate heat exchanger can receive gas injection from the outside through a cover hole provided in the cover. The heat-conducting plate assembly may include a first heat-conducting plate and a second heat-conducting plate stacked on top of each other. Dead zone holes may penetrate through dead zones formed in the first heat-conducting plate and the second heat-conducting plate.

[0083] According to one embodiment, the heat-conducting plate assembly may include a plurality of heat-conducting plates stacked on top of each other, the plurality of heat-conducting plates causing a first fluid and a second fluid with a temperature lower than the first fluid to flow to their respective heat-conducting regions, so as to allow the first fluid and the second fluid to exchange heat.

[0084] The cover can seal the heat-conducting plate assembly from the outside. The cover has a thickness greater than that of each heat-conducting plate and can be made of a high-strength material. The cover can have a plate shape corresponding to the shape of each heat-conducting plate.

[0085] According to one embodiment, the heat-conducting plate assembly may include a first heat-conducting plate and a second heat-conducting plate.

[0086] The first heat-conducting plate may have a first heat-conducting region having a first flow path for the flow of the first fluid.

[0087] The second heat-conducting plate can be stacked and joined alternately with the first heat-conducting plate, and has a second heat-conducting region forming a second flow path for the flow of the second fluid.

[0088] According to one embodiment, each of the first heat-conducting plate and the second heat-conducting plate may be provided with a non-flow path region formed outside the first heat-conducting region and the second heat-conducting region, and a dead zone in which the inflow of the first fluid and the second fluid is blocked.

[0089] Additionally, the cover may be provided with a cover hole that allows gas to be injected from the outside.

[0090] In addition, a dead zone hole communicating with the cover hole is provided in the dead zone. By allowing gas injected through the cover hole to flow into the dead zone hole, the airtightness of the dead zone can be checked.

[0091] According to one embodiment, the cover may include a plurality of covers that seal both sides of the heat-conducting plate joint.

[0092] At this time, one of the plurality of covers may have the following structure: combined with and covering one side of the heat-conducting plate joint, enabling the first fluid to flow in and out from the outside, and enabling the second fluid to flow in and out from the outside.

[0093] Additionally, another of the plurality of covers may have the following structure: it is provided with the cover hole, which connects to and covers the other side of the heat-conducting plate assembly, and seals the heat-conducting plate assembly from the outside except for the cover hole.

[0094] According to one embodiment, the cover hole and the dead zone hole can be formed facing each other at the same location.

[0095] According to one embodiment, the cover hole and the dead zone hole can have a circular shape with the same diameter as each other.

[0096] According to one embodiment, the center of the cover hole and the dead zone hole can be aligned.

[0097] According to one embodiment, the first heat-conducting plate and the second heat-conducting plate may be made of a first material. The cover may be made of a second material. The second material may be made of a material with higher strength than the first material.

[0098] According to one embodiment, the first heat-conducting plate and the second heat-conducting plate may have a first thickness. The second cover may have a second thickness. The second thickness may be thicker than the first thickness.

[0099] According to one embodiment, during the airtightness check of the dead zone, when gas is injected through the cover hole located on the cover, the injected gas can flow inward through the dead zone hole formed by penetrating the dead zones of the first and second heat-conducting plates. The gas flowing into the dead zone may flow between the dead zone and the water flow path, i.e., the first flow path, and the airtightness of the dead zone can be checked by confirming this gas flow. Furthermore, based on the airtightness check results of the dead zone, poor brazing at the periphery of the dead zone can be detected.

[0100] According to one embodiment, a sealing portion may also be included, which, after an airtightness check of the dead zone, blocks the cover hole to seal the cover hole and prevent external moisture from entering the interior of the cover hole.

[0101] According to various embodiments, a cover hole is formed on the cover side surrounding the heat-conducting plate to receive gas injection from the outside. Additionally, a dead zone hole communicating with the cover hole can be formed in the dead zone of the non-flow path area on the side of the heat-conducting plate surrounded by the cover. After brazing the periphery of the dead zone, if a test gas (e.g., air, helium, etc.) is injected into the cover hole from the outside, the injected gas can flow into the interior of the dead zone through the dead zone hole. Then, it can be checked whether the gas flows between the dead zone and the flow path of the first fluid (i.e., water) to check whether the dead zone remains airtight. Based on the inspection results, poor brazing at the periphery of the dead zone can be easily and quickly inspected before the product leaves the factory.

[0102] Furthermore, according to various embodiments, after the airtightness test of the dead zone, the cover hole on the cover side surrounding the heat-conducting plate can be sealed to plug the cover hole. This prevents moisture contained in the outside air from flowing into the heat-conducting plate or the interior of the dead zone after the airtightness test. As a result, unlike existing technologies where outside air can flow in after the airtightness test, problems such as icing and freezing cracking caused by moisture penetration can be prevented by preventing external moisture penetration in advance. In particular, the cover hole can be formed on the cover side, which is stronger and thicker than the heat-conducting plate. Therefore, it has the advantage of being able to use a wider variety of sealing methods (e.g., plugs, silicone, welding, etc.) to seal the cover hole formed on the stronger and thicker cover.

[0103] Furthermore, according to various embodiments, the holes for injecting gas can be formed on the cover side, which is relatively thicker and stronger than the heat-conducting plate, instead of forming holes for directly injecting external gas on the relatively thin heat-conducting plate side. Therefore, when forming holes for injecting external gas, the holes have excellent machinability, and the shape and number of holes can be varied.

[0104] In addition to the effects described above, the specific effects of the present invention will be described together with the following description of specific matters for carrying out the invention. Attached Figure Description

[0105] Figure 1 This is a perspective view schematically illustrating one embodiment of a plate heat exchanger.

[0106] Figure 2 This is a schematic diagram illustrating the first heat-conducting plate of a plate-shaped heat exchanger according to one embodiment.

[0107] Figure 3 and Figure 4 This is an exemplary diagram showing the location of dead zone holes formed in the dead zone of a first heat-conducting plate of a plate heat exchanger according to one embodiment.

[0108] Figure 5 This is a schematic diagram illustrating the second heat-conducting plate of a plate-shaped heat exchanger according to one embodiment.

[0109] Figure 6 and Figure 7 This is an exemplary diagram showing the location of dead zone holes formed in the dead zone of a second heat-conducting plate of a plate heat exchanger according to one embodiment.

[0110] Figure 8 This is an exploded perspective view of the second cover, second heat-conducting plate, and first heat-conducting plate in a plate heat exchanger according to an embodiment, separated along the stacking direction.

[0111] Figure 9 This is a schematic diagram illustrating the second cover of a plate-shaped heat exchanger according to one embodiment.

[0112] Figure 10 and Figure 11 This is an exemplary diagram showing the location of the cover hole formed in the second cover of a plate heat exchanger according to one embodiment.

[0113] Figure 12 and Figure 13 This is a diagram illustrating the operation of injecting inspection gas through the cover hole of the second cover in one embodiment.

[0114] Figure 14 and Figure 15 This diagram illustrates an embodiment of a structure in which, after performing an airtightness check on the dead zone, a sealing portion is used to seal the cover hole to prevent the intrusion of external moisture.

[0115] Explanation of reference numerals in the attached figures

[0116] W: Primary fluid (e.g., water) R: Secondary fluid (e.g., refrigerant)

[0117] 1: Plate heat exchanger; 10: Heat-conducting plate joint.

[0118] 20: First heat-conducting plate; 201: First fluid inflow section of the first heat-conducting plate.

[0119] 202: First fluid outlet of the first heat-conducting plate; 203: Second fluid inlet of the first heat-conducting plate.

[0120] 204: First heat-conducting plate, second fluid outlet; 21: First heat-conducting area.

[0121] 211: Peak 212: Valley

[0122] 22: Dead Zone 23: Dead Zone Hole

[0123] 25: Flat part 26: Protrusion

[0124] 27: First flange portion; 30: Second heat-conducting plate

[0125] 301: First fluid inlet of the second heat-conducting plate; 302: First fluid outlet of the second heat-conducting plate.

[0126] 303: Second fluid inlet of the second heat-conducting plate; 304: Second fluid outlet of the second heat-conducting plate.

[0127] 31: Second thermally conductive region; 311: Peak.

[0128] 312: Tanibe 32: Dead Zone

[0129] 33: Dead zone hole; 35: Flat section

[0130] 36: Protrusion 37: Second flange

[0131] 40: First cover; 401: First fluid external inflow section

[0132] 402: First fluid external outlet; 403: Second fluid external inlet.

[0133] 404: Second fluid external outlet; 60: Second cover

[0134] 63: Cover hole; 90: Sealing part

[0135] 91: Plug 92: Welded sealing part

[0136] 93: Sealed section Detailed Implementation

[0137] The above-described objects, features, and advantages will now be described in detail with reference to the accompanying drawings. Therefore, those skilled in the art can readily implement the technical concept of this invention. In the description of this invention, if a detailed description of publicly known technology related to this invention is deemed likely to obscure the main points, such detailed description will be omitted. Preferred embodiments of the invention will now be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals refer to the same or similar constituent elements.

[0138] Throughout this specification, unless otherwise stated, each constituent element may be singular or plural.

[0139] In the following text, the phrase "arbitrary configuration is arranged on the upper (or lower) part" of a constituent element or on the upper (or lower) part of a constituent element" can indicate not only that the arbitrary configuration is connected to the top (or bottom) surface of the constituent element, but also that other configurations may be provided between the constituent element and the arbitrary configuration arranged on (or below) the constituent element.

[0140] In addition, it should be understood that if a constituent element is described as being "connected", "combined", or "linked" with another constituent element, then the constituent elements may be directly connected or linked, or other constituent elements may be "interspersed" between each constituent element, or the constituent elements may be "connected", "combined", or "linked" through other constituent elements.

[0141] Hereinafter, various embodiments of plate heat exchangers will be described in detail with reference to the accompanying drawings.

[0142] [Overall structure of plate heat exchanger]

[0143] Describe the overall structure of the plate heat exchanger.

[0144] Figure 1 This is a diagram illustrating one embodiment of a plate heat exchanger. Figures 2 to 4 This is a schematic diagram illustrating the first heat-conducting plate of one embodiment. Figures 5 to 7 This is a schematic diagram illustrating a second heat-conducting plate according to one embodiment.

[0145] One embodiment of the plate heat exchanger 1 may include a heat-conducting plate joint 10 consisting of a first heat-conducting plate 20 and a second heat-conducting plate 30 alternately stacked and joined together, as well as a cover, namely a first cover 40 and a second cover 60.

[0146] Reference Figure 1 The first heat-conducting plate 20 and the second heat-conducting plate 30, which constitute the heat-conducting plate joint 10, are alternately stacked and bonded together. At this time, the stacking direction can be the front-to-back direction (FR direction, see reference). Figure 1Additionally, the length direction of the first heat-conducting plate 20 and the second heat-conducting plate 30 can be vertical (UD direction, reference). Figure 1 Additionally, the width direction of the first heat-conducting plate 20 and the second heat-conducting plate 30 can be in the left-right direction (LeRi direction, see reference). Figure 1 ).

[0147] It should be noted that, referring to Figure 1 The plate heat exchanger 1 shown in the figure is longer than its width, but the invention is not limited thereto.

[0148] Therefore, although not shown separately, there are various embodiments in which the length and width of the plate heat exchanger 1 are the same, or the length of the plate heat exchanger 1 is shorter than the width.

[0149] Furthermore, referring to Figure 1 The diagram shows a heat-conducting plate assembly 10 comprising a first heat-conducting plate 20 and two second heat-conducting plates 30 stacked on the front and back sides of the first heat-conducting plate 20, but the invention is not limited thereto.

[0150] Therefore, although not shown separately, the heat-conducting plate assembly 10 can have various embodiments in which the first heat-conducting plate 20 and the second heat-conducting plate 30 are stacked and joined together alternately in various quantities.

[0151] Reference Figures 1 to 7 One embodiment of the plate heat exchanger 1 includes a heat-conducting plate joint 10, a first cover 40, and a second cover 60.

[0152] The heat-conducting plate assembly 10 may include a plurality of heat-conducting plates 20, 30.

[0153] According to one embodiment, the heat-conducting plate assembly 10 may include a plurality of heat-conducting plates 20, 30.

[0154] The heat-conducting plate assembly 10 may have a structure in which a plurality of heat-conducting plates 20, 30 are stacked and joined together alternately.

[0155] Multiple heat-conducting plates 20 and 30 are stacked alternately to allow a relatively high-temperature first fluid (e.g., water) W and a relatively low-temperature second fluid (e.g., refrigerant) R to flow to their respective heat-conducting areas for heat exchange.

[0156] According to a preferred embodiment, the heat-conducting plate assembly 10 may include a first heat-conducting plate 20.

[0157] The first heat-conducting plate 20 may have a first heat-conducting region 21, which forms a first flow path for a first fluid (e.g., water) W to flow through.

[0158] According to a preferred embodiment, the heat-conducting plate assembly 10 may further include a second heat-conducting plate 30.

[0159] The second heat-conducting plate 30 and the first heat-conducting plate 20 are stacked alternately to form a heat-conducting plate assembly 10. The second heat-conducting plate 30 may have a second heat-conducting region 31, which forms a second flow path for the flow of a second fluid (e.g., refrigerant, etc.) R.

[0160] According to one embodiment, the first heat-conducting plate 20 may have a dead zone 22 formed outside the first heat-conducting region 21, which is a non-flow path region (i.e., a region where no fluid flows). Here, the dead zone 22 is a region referred to in another term as a cavity, which means a region where there is no fluid flow and no fluid exists.

[0161] The dead zone 22 of the first heat-conducting plate 20 is structurally isolated from the area where the first fluid W flows, so that the first fluid W will not flow in.

[0162] According to one embodiment, the second heat-conducting plate 30 may have a dead zone 32 formed outside the second heat-conducting region 31, which is a non-flow path region (i.e., a region where no fluid flows). Here, the dead zone 32 is a region referred to in another term as a cavity, which means a region where there is no fluid flow and no fluid exists.

[0163] The dead zone 32 of the second heat-conducting plate 30 is structurally isolated from the area where the second fluid R flows, so that the second fluid R will not flow in.

[0164] The first cover 40 can be attached to one side of the heat-conducting plate joint 10.

[0165] According to one embodiment, the first cover 40 can be attached to the front of a heat-conducting plate assembly 10 consisting of a plurality of first and second heat-conducting plates 20, 30 stacked together. Figure 1 (in the F direction) plane (refer to) Figure 1 ).

[0166] The first cover 40 allows a first fluid (e.g., water) W to flow in from the outside, or allows the first fluid (e.g., water) W to flow out from the outside after heat exchange has ended.

[0167] At this time, the first fluid (e.g., water) flowing in from the outside through the first cover 40 flows through the first fluid inflow section 201, 301 of the first and second heat-conducting plates 20 and 30.

[0168] The first fluid (e.g., water) W flows along the first heat-conducting region 21 of the first heat-conducting plate 20 and can be used for heat exchange with the second fluid (e.g., refrigerant) R flowing along the second heat-conducting regions 31 that are stacked opposite each other.

[0169] Additionally, the first cover 40 can allow the second fluid (e.g., refrigerant, etc.) R to flow in from the outside, or allow the second fluid (e.g., refrigerant, etc.) R to flow out from the outside after heat exchange has ended.

[0170] At this time, the second fluid (e.g., refrigerant, etc.) R that flows in from the outside through the first cover 40 flows through the second fluid inflow section 203, 303 of the first and second heat-conducting plates 20, 30.

[0171] The inflowing second fluid (e.g., refrigerant, etc.) R flows along the second heat-conducting region 31 of the second heat-conducting plate 30 and can be used for heat exchange with the first fluid (e.g., water, etc.) W flowing along the first heat-conducting regions 21 stacked opposite to each other.

[0172] As described above, the first cover 40 can allow a first fluid (e.g., water) W to flow from the outside into the first and second heat-conducting plates 20 and 30, or allow the first fluid (e.g., water) W used in heat exchange to flow out through the first and second heat-conducting plates 20 and 30.

[0173] In addition, the first cover 40 can allow the second fluid (e.g., refrigerant, etc.) R to flow into the first and second heat-conducting plates 20 and 30 from the outside, or allow the second fluid (e.g., refrigerant, etc.) R used in heat exchange to flow out to the outside via the first and second heat-conducting plates 20 and 30.

[0174] The second cover 60 can be attached to the other side of the heat-conducting plate assembly 10.

[0175] According to one embodiment, the second cover 60 can be coupled to the rear of a heat-conducting plate assembly 10 composed of a plurality of first and second heat-conducting plates 20, 30 stacked together. Figure 1 (in the R direction) plane (refer to) Figure 1 ).

[0176] The second cover 60 is attached to the other side of the heat-conducting plate joint 10, and can seal the other side of the heat-conducting plate joint 10 from the outside. That is, the second cover 60 can prevent the heat-conducting plate joint 10 from being exposed to the outside to prevent the inflow of external air.

[0177] Furthermore, the second cover 60 may be provided with a cover hole 63 that allows gas to be injected from the outside.

[0178] According to one embodiment, the cover hole 63 may be formed through the thickness direction of the second cover 60. The cover hole 63 can be used to receive gas injected from the outside for dead zone airtightness checks.

[0179] According to one embodiment, a cover hole 63 is provided in the second cover 60, and dead zone holes 23 and 33 may also be provided in the dead zones 22 and 32 of the first and second heat-conducting plates 20 and 30, respectively. Furthermore, these dead zone holes 23 and 33 may have a structure that communicates with the cover hole 63.

[0180] When the first and second heat-conducting plates 20 and 30 are stacked alternately, the periphery of the dead zones 22 and 32 formed in each of the first and second heat-conducting plates 20 and 30 is fixed to each other by brazing.

[0181] After brazing, a dead zone airtightness check can be performed by injecting inspection gas from the outside through the cap hole 63.

[0182] Gas injected into the plate heat exchanger 1 through the cover hole 63 can flow into the dead zone through the dead zone holes 23 and 33 provided in the dead zones 22 and 32 of each of the first and second heat-conducting plates 20 and 30. Furthermore, the airtightness of the dead zone can be checked by confirming whether the inflowing gas flows through the dead zone into the flow path of the first fluid (e.g., water) W. As a result, brazing defects can be pre-checked after the plate heat exchanger is brazed and before shipment, thus improving product reliability.

[0183] Here, the gas used for inspection can be composed of air and helium, etc. It should be noted that it is not necessarily limited to the composition of these gases, and various different implementation methods are possible.

[0184] [Structure of cover hole and dead zone hole]

[0185] According to one embodiment, the cover hole 63 may be formed facing each other at the same location as the dead zone holes 23 and 33.

[0186] Therefore, when the inspection gas G is injected into the interior of the plate heat exchanger 1 through the cover hole 63 located in the second cover 60, the injected gas G can quickly and smoothly flow into the interior of the dead zones 22 and 32 through the dead zone holes 23 and 33. As a result, the time required for airtightness inspection of the dead zones can be shortened, and sufficient gas can flow into the dead zones, thereby enabling accurate airtightness inspection between the dead zones and the flow path of the first fluid (e.g., water).

[0187] According to one embodiment, the cover hole 63 and the dead zone holes 23 and 33 may have a circular shape with the same diameter as each other.

[0188] According to a preferred embodiment, the centers of the cover hole 63 and the dead zone holes 23 and 33 can be aligned. In other words, the center of the cover hole 63 and the center of the dead zone holes 23 and 33 are located at the same center, so that they can be connected to each other facing each other with the stacking direction as a reference.

[0189] Therefore, the gas injected through the cover hole 63 can quickly flow into the interior of the dead zones 22 and 32 through the dead zone holes 23 and 33. With sufficient gas flowing into the dead zones 22 and 32, the airtightness check of the dead zones can be performed more accurately.

[0190] In addition, according to another embodiment, the centers of the cover hole 63 and the dead zone holes 23 and 33 are aligned with each other, but the diameter of the cover hole 63 can be larger than the diameter of the dead zone holes 23 and 33.

[0191] Therefore, it has the advantage of being able to inject inspection gas more quickly from the outside through the relatively large diameter cover hole 63. At this time, the second cover 60 can have a shape with a thickness greater than that of the first and second heat-conducting plates 20 and 30. Therefore, even if the relatively thick second cover 60 forms a large diameter cover hole 63, it will not be detrimental to structural strength. In other words, since the strength of the second cover 60 is higher than that of the first and second heat-conducting plates 20 and 30, the diameter of the cover hole 63 can be larger than the diameter of the dead zone holes 23 and 33.

[0192] According to one embodiment, the cover hole 63 may be provided in a plurality of different positions on the second cover 60.

[0193] According to a preferred embodiment, the cover hole 63 can be located on the second cover 60 in the upper direction (U direction, see reference). Figure 1 One end (i.e., the upper end) of the first cover and the other end (i.e., the lower end) of the second cover 60 in the lower direction (D direction) are respectively formed.

[0194] The dead zone holes 23 and 33 respectively set in the first and second heat-conducting plates 20 and 30 can be provided in a number corresponding to the number of these cover holes 63.

[0195] According to a preferred embodiment, dead zone holes 23 and 33 can be provided at both ends of each of the first and second heat-conducting plates 20 and 30, corresponding to the two cover holes 63 located at both ends of the second cover 60. In addition, the plurality of cover holes 63 and dead zone holes 23 and 33 are respectively arranged facing each other to form the same center, thereby having a structure that is interconnected with each other.

[0196] [Material and thickness of the cover and heat-conducting plate]

[0197] According to one embodiment, the first and second heat-conducting plates 20 and 30 can be made of a first material. In contrast, the first and second covers 40 and 60 can be made of a second material. In this case, the strength of the second material can be higher than that of the first material.

[0198] As described above, the strength of the second material, which is the material of the second cover 60 having a cover hole 63 for injecting inspection gas from the outside, can be higher than that of the first material, which is the material of the first and second heat-conducting plates 20 and 30.

[0199] Furthermore, the first and second heat-conducting plates can have a first thickness. In contrast, the second cover can have a second thickness. In this case, the second thickness can be greater than the first thickness. That is, the second cover can have a thickness greater than that of the first and second heat-conducting plates.

[0200] Therefore, it has the advantage of excellent machinability of the hole with cover hole 63.

[0201] Furthermore, since the cover hole 63 is formed in the second cover 60 that seals the first and second heat-conducting plates 20 and 30, the risk of leakage of fluid flowing through the first and second heat-conducting plates 20 and 30 to the outside of the second cover 60 can be reduced.

[0202] According to a preferred embodiment, the first heat-conducting plate 20 may be made of SUS316L material. Additionally, the second heat-conducting plate 30 may be made of SUS316L material.

[0203] In contrast, the first and second covers 40 and 60 can be made of SUS304 material.

[0204] Here, compared with SUS316L, which is the material of the first and second heat-conducting plates 20 and 30, SUS304, which is the material of the second cover 60, has a relatively high chromium and nickel content, and therefore has excellent heat resistance, wear resistance and weldability.

[0205] In contrast, compared to SUS304, which is used as the material for the second cover 60, SUS316L, which is used as the material for the first and second heat-conducting plates 20 and 30, has a higher molybdenum content and thus enhanced corrosion resistance, making it suitable for use in environments with a high probability of corrosion. Therefore, it is preferable to use it as the material for the heat-conducting plates for the first and second fluid flows.

[0206] Furthermore, since SUS304, the material used for the second cover 60, has excellent heat resistance, wear resistance, and weldability, it is advantageous to seal the cover hole 63 in various ways after checking the airtightness of the dead zone. For example, when the second cover 60 is made of SUS304, it has the advantage of not only facilitating sealing methods such as using mechanical sealing methods like plugs or injecting silicone to close the cover hole, but also facilitating sealing the cover hole by welding.

[0207] According to a preferred embodiment, the second cover 60 may have a thickness of 5 to 7 times that of the first and second heat-conducting plates 20 and 30.

[0208] For example, if the thickness of the first and second heat-conducting plates 20 and 30 is 0.2 mm to 0.4 mm, the thickness of the second cover 60 can be 1.0 mm to 2.8 mm.

[0209] As described above, when the second cover 60 has a thickness of 5 to 7 times that of the first and second heat-conducting plates 20 and 30, it has the advantage of being easy to process or mold into a hole shape and hole size that is conducive to gas injection.

[0210] Moreover, after checking the airtightness of the dead zone, when the cover hole 63 is blocked by various sealing methods, the thickness of the second cover 60 with the cover hole 63 is sufficiently large, which has the advantage of ensuring a stronger sealing force.

[0211] [Structure of the First Cover]

[0212] According to one embodiment, the first cover 40 may include a first external fluid inflow portion 401 (see reference). Figure 1 ).

[0213] The first fluid external inflow section 401 refers to the inlet through which the first fluid (e.g., water) W flows in from the outside of the first cover 40. The first fluid (e.g., water) W can flow into the heat-conducting plate joint 10, i.e., the first and second heat-conducting plates 20 and 30, through the first fluid external inflow section 401.

[0214] According to one embodiment, the first cover 40 may include a first fluid external outlet 402 (see reference). Figure 1 ).

[0215] The first fluid external outlet 402 refers to the outlet through which the first fluid (e.g., water) W flowing out from the first and second heat-conducting plates 20 and 30 flows out to the outside of the first cover 40. The first fluid (e.g., water) W can flow through the first and second heat-conducting plates 20 and 30 stacked on top of each other and along a set first flow path, and can flow out to the outside of the first cover 40 after the heat exchange is completed.

[0216] According to one embodiment, the first cover 40 may include a second external fluid inflow portion 403 (see reference). Figure 1 ).

[0217] The second fluid external inflow section 403 refers to the inlet through which the second fluid (e.g., refrigerant, etc.) R flows in from the outside of the first cover 40. The second fluid (e.g., refrigerant, etc.) R can flow into the heat-conducting plate joint 10, i.e., the first and second heat-conducting plates 20 and 30, through the second fluid external inflow section 403.

[0218] According to one embodiment, the first cover 40 may include a second fluid external outlet 404 (see reference). Figure 1 ).

[0219] The second fluid external outlet 404 refers to an outlet that allows the second fluid (e.g., refrigerant, etc.) R flowing out from the first and second heat-conducting plates 20 and 30 to flow out to the outside of the first cover 40. The second fluid (e.g., refrigerant, etc.) R can flow through the first and second heat-conducting plates 20 and 30 stacked on top of each other and along a set second flow path, and can flow out to the outside of the first cover 40 after the heat exchange is completed.

[0220] As described above, the first cover 40 may include a first fluid external inflow section 401 for allowing a first fluid (e.g., water) W to flow in from the outside and a first fluid external outflow section 402 for discharging the first fluid (e.g., water) W to the outside after heat exchange is completed.

[0221] Additionally, the first cover 40 may include a second fluid external inflow section 403 for allowing a second fluid (e.g., refrigerant, etc.) R to flow in from the outside and a second fluid external outflow section 404 for discharging the second fluid (e.g., refrigerant, etc.) R to the outside after heat exchange is completed.

[0222] The first cover 40 can be formed such that, except for the first external fluid inflow portion 401, the first external fluid outflow portion 402, the second external fluid inflow portion 403, and the second external fluid outflow portion 404, the remaining areas seal the first and second heat-conducting plates 20 and 30 from the outside.

[0223] [Structure of the first heat-conducting plate]

[0224] Figures 2 to 4 This is a schematic diagram illustrating a first heat-conducting plate of one embodiment.

[0225] According to one embodiment, the first heat-conducting plate 20 may have a first heat-conducting region 21. A first flow path for a first fluid (e.g., water) W to flow may be formed in the first heat-conducting region 21.

[0226] The heat-conducting plate assembly 10 includes: a first heat-conducting plate 20 having a first heat-conducting region 21 for flowing a first fluid (e.g., water) W at a high temperature; and a second heat-conducting plate 30 having a second heat-conducting region 31 for flowing a second fluid (e.g., refrigerant) R at a low temperature.

[0227] The first heat-conducting plate 20 and the second heat-conducting plate 30 are stacked alternately so that the first fluid (e.g., water) W flowing in the first heat-conducting region 21 exchanges heat with the second fluid (e.g., refrigerant) R flowing in the second heat-conducting region 31.

[0228] According to one embodiment, the first heat-conducting plate 20 may include a first fluid inflow portion 201.

[0229] The first fluid inflow portion 201 of the first heat-conducting plate can be located at one end (e.g., the lower end) along the length direction (UD direction) of the first heat-conducting plate 20 (see reference). Figure 2 The first heat-conducting plate first fluid inlet 201 can be used as an inlet for the inflow of a first fluid (e.g., water).

[0230] The first fluid inlet portion 201 of the first heat-conducting plate can also be connected to the flow path (i.e., the first flow path) through which the first fluid flows in the first heat-conducting region 21. Thus, a structure can be formed in which the first fluid (e.g., water) W flowing into the first fluid inlet portion 201 of the first heat-conducting plate flows along the first heat-conducting region 21.

[0231] According to one embodiment, the first heat-conducting plate 20 may include a first fluid outflow portion 202.

[0232] The first fluid outlet 202 of the first heat-conducting plate can be located at the other end (e.g., the upper end) of the first heat-conducting plate 20 along its length (UD direction) (see reference). Figure 2 The first fluid outlet 202 of the first heat-conducting plate can be used as an outlet for the first fluid (e.g., water) W to flow out.

[0233] The first fluid outlet 202 of the first heat-conducting plate can also be connected to the flow path (i.e., the first flow path) through which the first fluid flows in the first heat-conducting region 21. Thus, the first fluid (e.g., water) W flowing along the first heat-conducting region 21 can flow out through the first fluid outlet 202 of the first heat-conducting plate.

[0234] According to one embodiment, the first heat-conducting plate 20 may include a second fluid inflow portion 203.

[0235] The second fluid inflow portion 203 of the first heat-conducting plate can be located at the other end (e.g., the upper end) of the first heat-conducting plate 20 along its length (UD direction) (see reference). Figure 2 The second fluid inlet 203 of the first heat-conducting plate can be used as an inlet for the inflow of a second fluid (e.g., refrigerant, etc.) R.

[0236] According to a preferred embodiment, the second fluid inflow portion 203 of the first heat-conducting plate may be located on one side (e.g., the right side) of the first fluid outflow portion 202 of the first heat-conducting plate (see reference). Figure 2 ) and separate it from it.

[0237] The second fluid inflow portion 203 of the first heat-conducting plate may have a structure that isolates it from the first heat-conducting region 21, that is, a structure that isolates it from the flow path of the first fluid (i.e., the first flow path). As a result, the flow of the second fluid (e.g., refrigerant, etc.) R into the first heat-conducting region 21 can be blocked.

[0238] According to one embodiment, the first heat-conducting plate 20 may further include a second fluid outflow portion 204.

[0239] The second fluid outlet 204 of the first heat-conducting plate can be located at one end (e.g., the lower end) along the length direction (UD direction) of the first heat-conducting plate 20 (see reference). Figure 2 The second fluid outlet 204 of the first heat-conducting plate can be used as an outlet for the second fluid (e.g., refrigerant, etc.) R to flow out.

[0240] According to a preferred embodiment, the second fluid outlet 204 of the first heat-conducting plate may be located on one side (e.g., the right side) of the first fluid inlet 201 of the first heat-conducting plate (see reference). Figure 2 ) and separate it from it.

[0241] The second fluid outlet 204 of the first heat-conducting plate may have a structure that isolates it from the first heat-conducting region 21, that is, a structure that isolates it from the flow path of the first fluid (i.e., the first flow path). As a result, the flow of the second fluid (e.g., refrigerant, etc.) R to the first heat-conducting region 21 can be blocked.

[0242] The following is for reference Figures 2 to 4 The structure of the first heat-conducting plate 20 in a preferred embodiment will be described in more detail below.

[0243] The first heat-conducting plate 20 may have a first heat-conducting region 21 through which a first fluid (e.g., water) W flows.

[0244] The first heat-conducting plate 20 may include a first fluid external inflow portion 401 through the first cover 40 (see reference). Figure 1 The first fluid (e.g., water) introduced into the first heat-conducting plate flows into the first fluid inlet section 201.

[0245] The first fluid inflow section 201 of the first heat-conducting plate can be located in the lower left region S1 of the first heat-conducting region 21.

[0246] The first heat-conducting plate 20 may include a first heat-conducting plate first fluid outflow section 202 from which a first fluid (e.g., water) W flows.

[0247] The first fluid outlet 202 of the first heat-conducting plate can be located in the upper left region S1 of the first heat-conducting region 21. The first fluid (e.g., water) W flowing out from the first fluid outlet 202 of the first heat-conducting plate can flow out to the outside of the plate heat exchanger via the first fluid external outlet 402 of the first cover 40.

[0248] The first heat-conducting plate 20 may include a second fluid external inflow section 403 through the first cover 40 (see reference). Figure 1 The second fluid (e.g., refrigerant, etc.) R introduced into the first heat-conducting plate flows into the second fluid inlet section 203.

[0249] The second fluid inflow section 203 of the first heat-conducting plate can be located in the upper right region S2 of the first heat-conducting region 21.

[0250] The first heat-conducting plate 20 may include a second fluid outlet portion 204 from which a second fluid (e.g., refrigerant, etc.) R flows.

[0251] The second fluid outlet 204 of the first heat-conducting plate can be located in the lower right region S2 of the first heat-conducting region 21. The second fluid (e.g., refrigerant) R flowing out from the second fluid outlet 204 of the first heat-conducting plate can flow out to the outside of the plate heat exchanger via the second fluid external outlet 404 of the first cover 40.

[0252] According to one embodiment, the first thermally conductive region 21 may include a ridge 211 and a valley 212.

[0253] Valleys 212 can be located between a plurality of adjacent peaks 211. In addition, valleys 212 can form a stepped shape with peaks 211.

[0254] According to one embodiment, the first heat-conducting region 21 may have a wave shape with peaks 211 and valleys 212 alternately arranged.

[0255] According to a preferred embodiment, the wave shape of the first heat-conducting region 21 can be an inverted-V shape or a V shape. This increases the heat transfer area of ​​the first fluid (e.g., water) W flowing along the first heat-conducting region 21, thereby improving performance and efficiency.

[0256] The peak 211 and valley 212 of the first heat-conducting region 21 can extend in the left-right direction (LeRi direction).

[0257] The peaks 211 and valleys 212 of the first heat-conducting region 21 can have an inverted V shape or a V shape by changing the direction of the boundary between the left region S1 and the right region S2.

[0258] According to a preferred embodiment, the peaks 211 and valleys 212 of the first heat-conducting region 21 can be formed to slope upwards from the left end LE of the first heat-conducting plate 20 closer to the boundaries of the left region S1 and the right region S2. Additionally, the peaks 211 and valleys 212 of the first heat-conducting region 21 can have a shape that slopes downwards from the boundaries of the left region S1 and the right region S2 closer to the right end RE of the first heat-conducting plate 20 (see reference). Figures 2 to 4 ).

[0259] According to one embodiment, the first heat-conducting plate 20 may include a flat portion 25.

[0260] The flat portion 25 refers to a portion that surrounds the first fluid inflow portion 201 of the first heat-conducting plate and the first fluid outflow portion 202 of the first heat-conducting plate into which the first fluid (e.g., water) W flows, and is formed into a flat shape with a predetermined area.

[0261] The following example illustrates the case where a first fluid (e.g., water) W is cooled by a second fluid (e.g., refrigerant) R.

[0262] The first fluid (e.g., water) W flowing through the first fluid inlet 201 of the first heat-conducting plate may be frozen by the second fluid (e.g., refrigerant) R flowing through the second fluid outlet 204 of the first heat-conducting plate. Alternatively, the first fluid (e.g., water) W flowing through the first fluid outlet 302 of the second heat-conducting plate may be frozen by the second fluid (e.g., refrigerant) R flowing through the second fluid inlet 303 of the second heat-conducting plate.

[0263] When a flat portion 25 with an asymmetrical shape is formed with the center of the first fluid inflow portion 201 of the first heat-conducting plate as a reference, the flow of the first fluid (e.g., water) W can be prevented from stagnating in the first fluid inflow portion 201 of the first heat-conducting plate, thereby preventing freezing.

[0264] In other words, the asymmetrical flat portion 25 can prevent freezing and cracking accidents by preventing the flow of the first fluid (e.g., water) W from slowing down or stagnating in the first fluid inflow portion 201 of the first heat-conducting plate. In the same way, the asymmetrical flat portion 25 can also be formed in the first fluid outflow portion 202 of the first heat-conducting plate.

[0265] According to a preferred embodiment, a protrusion 26 may also be provided on the flat portion 25. The protrusion 26 protrudes from a predetermined position on the flat portion 25 to prevent the flow of the first fluid (e.g., water) W from stagnating, thereby preventing eddies and guiding the flow direction of the first fluid (e.g., water) W. The protrusion 26 may have various shapes, including cylindrical or polygonal prism shapes.

[0266] According to one embodiment, the first heat-conducting plate 20 may have a dead zone 22, which is a non-flow path region formed outside the first heat-conducting region 21 where fluid does not flow.

[0267] Reference Figure 3 and Figure 4 The dead zone 22 of the first heat-conducting plate 20 can be located in the right-hand region S2 of each of the upper and lower ends in the length direction outside the first heat-conducting region 21 of the first heat-conducting plate 20. The first fluid W will not flow into the dead zone 22 of the first heat-conducting plate 20.

[0268] The dead zone 22 of the first heat-conducting plate 20 can be formed at the corner position adjacent to the second fluid inflow portion 203 and the second fluid outflow portion 204 of the first heat-conducting plate into which the second fluid (e.g., refrigerant, etc.) R flows.

[0269] According to a preferred embodiment, a first flange 27 may also be provided along the edge of the first heat-conducting plate 20. Furthermore, each corner of the first heat-conducting plate 20 may have an arc shape.

[0270] The dead zone hole 23 of the first heat-conducting plate 20 can be formed by penetrating along the thickness direction and being disposed in the dead zone 22 of the corner adjacent to the second fluid inflow portion 203 of the first heat-conducting plate (see reference). Figure 3 ).

[0271] Furthermore, the dead zone hole 23 of the first heat-conducting plate 20 can be formed by penetrating through the dead zone 22 of the corner adjacent to the second fluid outflow portion 204 of the first heat-conducting plate along the thickness direction (see reference). Figure 4 ).

[0272] According to a preferred embodiment, the dead zone hole 23 can be configured at a predetermined distance HL from the second fluid inflow portion 203 and the second fluid outflow portion 204 of the first heat-conducting plate, respectively. Furthermore, the dead zone hole 23 can be configured close to the first flange portion 27 of the arc-shaped corner surrounding the first heat-conducting plate 20. Therefore, even if a dead zone hole is formed in the relatively thin second heat-conducting plate 30, the necessary rigidity can be maintained.

[0273] [Structure of the Second Heat-Conducting Plate]

[0274] Figures 5 to 7 This is a schematic diagram illustrating a second heat-conducting plate according to one embodiment.

[0275] According to one embodiment, the second heat-conducting plate 30 may have a second heat-conducting region 31. A second flow path for a second fluid (e.g., refrigerant, etc.) R to flow may be formed in the second heat-conducting region 31.

[0276] The heat-conducting plate assembly 10 includes: a first heat-conducting plate 20 having a first heat-conducting region 21 for flowing a first fluid (e.g., water) W at a high temperature; and a second heat-conducting plate 30 having a second heat-conducting region 31 for flowing a second fluid (e.g., refrigerant) R at a low temperature.

[0277] The second heat-conducting plate 30 can be stacked alternately with the aforementioned first heat-conducting plate 20. The second heat-conducting plate 30 enables heat exchange between the second fluid (e.g., refrigerant, etc.) R flowing in the second heat-conducting region 31 and the first fluid (e.g., water, etc.) W flowing in the first heat-conducting region 21.

[0278] According to one embodiment, the second heat-conducting plate 30 may include a second fluid inflow portion 303.

[0279] The second fluid inflow portion 303 of the second heat-conducting plate can be located at the other end (e.g., the upper end) of the second heat-conducting plate 30 along its length (UD direction) (see reference). Figure 5 ).

[0280] The second heat-conducting plate and the second fluid inlet 303 can be used as an inlet for the inflow of a second fluid (e.g., refrigerant, etc.) R.

[0281] The second fluid inlet 303 of the second heat-conducting plate can also be connected to the flow path (i.e., the second flow path) through which the second fluid flows in the second heat-conducting region 31. Thus, a structure can be formed in which the second fluid (e.g., refrigerant, etc.) R flowing into the second fluid inlet 303 of the second heat-conducting plate flows along the second heat-conducting region 31.

[0282] According to one embodiment, the second heat-conducting plate 30 may include a second fluid outflow portion 304.

[0283] The second fluid outlet 304 of the second heat-conducting plate can be located at one end (e.g., the lower end) along the length direction (UD direction) of the second heat-conducting plate 30 (see reference). Figure 5 The second heat-conducting plate, second fluid outlet 304, can be used as an outlet for the second fluid (e.g., refrigerant, etc.) R to flow out.

[0284] The second fluid outlet 304 of the second heat-conducting plate can also be connected to the flow path (i.e., the second flow path) through which the second fluid flows in the second heat-conducting region 31. Thus, the second fluid (e.g., refrigerant, etc.) R flowing along the second heat-conducting region 31 can flow out through the second fluid outlet 304 of the second heat-conducting plate.

[0285] According to one embodiment, the second heat-conducting plate 30 may further include a second heat-conducting plate first fluid inflow portion 301.

[0286] The first fluid inflow portion 301 of the second heat-conducting plate can be located at one end (e.g., the lower end) along the length direction (UD direction) of the second heat-conducting plate 30 (see reference). Figure 5 The first fluid inlet 301 of the second heat-conducting plate can be used as an inlet for the inflow of a first fluid (e.g., water).

[0287] According to a preferred embodiment, the first fluid inflow portion 301 of the second heat-conducting plate may be located on the other side (e.g., the left side) of the second fluid outflow portion 304 of the second heat-conducting plate (see reference). Figure 5 ) and separate it from it.

[0288] The first fluid inflow portion 301 of the second heat-conducting plate may have a structure that isolates it from the second heat-conducting region 31, that is, a structure that isolates it from the flow path of the second fluid (i.e., the second flow path). Thus, the flow of the first fluid (e.g., water) W to the second heat-conducting region 31 can be blocked.

[0289] According to one embodiment, the second heat-conducting plate 30 may further include a second heat-conducting plate first fluid outflow portion 302.

[0290] The first fluid outlet 302 of the second heat-conducting plate can be located at the other end (e.g., the upper end) of the second heat-conducting plate 20 in the length direction (UD direction) (see reference). Figure 5 The first fluid outlet 303 of the second heat-conducting plate can be used as an outlet for the first fluid (e.g., water) W to flow out.

[0291] According to a preferred embodiment, the first fluid outlet 302 of the second heat-conducting plate may be located on the other side (e.g., the left side) of the second fluid inlet 303 of the second heat-conducting plate (see reference). Figure 5 ) and separate it from it.

[0292] The first fluid outlet 302 of the second heat-conducting plate may have a structure that isolates it from the second heat-conducting region 31, that is, a structure that isolates it from the flow path of the second fluid (i.e., the second flow path). Thus, the flow of the first fluid (e.g., water) W to the second heat-conducting region 31 can be blocked.

[0293] The following is for reference Figures 5 to 7 The structure of the second heat-conducting plate 20 in a preferred embodiment will be described in more detail below.

[0294] The second heat-conducting plate 30 may have a second heat-conducting region 31 where a second fluid (e.g., refrigerant, etc.) R flows.

[0295] The second heat-conducting plate 30 may include a second fluid external inflow portion 403 through the first cover 40 (see reference). Figure 1 The second fluid (e.g., refrigerant, etc.) R introduced into the second heat-conducting plate flows into the second fluid inlet section 303.

[0296] The second fluid inflow section 303 of the second heat-conducting plate can be located in the upper right region S2 of the second heat-conducting region 31.

[0297] The second heat-conducting plate 30 may include a second heat-conducting plate second fluid outflow section 304 from which a second fluid (e.g., refrigerant, etc.) flows.

[0298] The second fluid outlet 304 of the second heat-conducting plate can be located in the lower right side region S2 of the second heat-conducting region 31. The second fluid flowing out from the second fluid outlet 304 of the second heat-conducting plate can flow out through the second fluid external outlet 404 of the first cover 40 (see reference). Figure 1 It flows out to the outside of the plate heat exchanger.

[0299] The second heat-conducting plate 30 may include a first fluid external inflow portion 401 through the first cover 40 (see reference). Figure 1 The first fluid (e.g., water) introduced into the second heat-conducting plate flows into the first fluid inlet section 301.

[0300] The first fluid inflow section 301 of the second heat-conducting plate can be located in the lower left region S1 of the second heat-conducting region 31.

[0301] The second heat-conducting plate 30 may include a second heat-conducting plate first fluid outflow section 302 from which a first fluid (e.g., water) W flows.

[0302] The first fluid outlet 302 of the second heat-conducting plate can be located in the upper left region S2 of the second heat-conducting region 31. The first fluid flowing out from the first fluid outlet 302 of the second heat-conducting plate can flow out through the first fluid external outlet 402 of the first cover 40 (see reference). Figure 1 It flows out to the outside of the plate heat exchanger.

[0303] According to one embodiment, the second thermally conductive region 31 may include a peak 311 and a valley 312.

[0304] The valley 312 can be located between a plurality of adjacent peaks 311. In addition, the valley 312 can form a stepped shape with the peaks 311.

[0305] According to one embodiment, the second heat-conducting region 31 may have a wave shape in which peaks 311 and valleys 312 are arranged alternately.

[0306] According to a preferred embodiment, the wave shape of the second heat-conducting region 31 can be an inverted V shape or a V shape. This increases the heat transfer area of ​​the second fluid (e.g., refrigerant) R flowing along the second heat-conducting region 31, thereby improving performance and efficiency.

[0307] The peak 311 and valley 312 of the second heat-conducting region 31 can extend in the left-right direction (LeRi direction).

[0308] The peaks 311 and valleys 312 of the second heat-conducting region 31 can have an inverted V shape or a V shape by changing the direction of the boundary between the left region S1 and the right region S2.

[0309] According to a preferred embodiment, the peaks 311 and valleys 312 of the second heat-conducting region 31 can be formed to slope downwards from the left end LE of the second heat-conducting plate 20 closer to the boundaries of the left region S1 and the right region S2. Additionally, the peaks 311 and valleys 312 of the second heat-conducting region 31 can have a shape that slopes upwards from the boundaries of the left region S1 and the right region S2 closer to the right end RE of the second heat-conducting plate 30 (see reference). Figures 5 to 7 ).

[0310] According to one embodiment, the second heat-conducting plate 30 may include a flat portion 35.

[0311] The flat portion 35 refers to a portion that surrounds the first fluid inflow portion 301 of the second heat-conducting plate and the first fluid outflow portion 302 of the second heat-conducting plate into which the first fluid (e.g., water) W flows, and is formed into a flat shape with a specified area.

[0312] The following example illustrates the case where a first fluid (e.g., water) W is cooled by a second fluid (e.g., refrigerant) R.

[0313] The first fluid (e.g., water) W flowing through the first fluid inlet 301 of the second heat-conducting plate may be frozen by the second fluid (e.g., refrigerant) R flowing through the second fluid outlet 304 of the second heat-conducting plate. Alternatively, the first fluid (e.g., water) W flowing through the first fluid outlet 302 of the second heat-conducting plate may be frozen by the second fluid (e.g., refrigerant) R flowing through the second fluid inlet 303 of the second heat-conducting plate.

[0314] When a flat portion 35 with an asymmetrical shape is formed with the center of the first fluid inflow portion 301 of the second heat-conducting plate as a reference, the flow of the first fluid (e.g., water) W can be prevented from stagnating in the first fluid inflow portion 301 of the second heat-conducting plate, thereby preventing freezing.

[0315] In other words, the asymmetrically shaped flat portion 35 can prevent freezing and cracking accidents by preventing the flow of the first fluid (e.g., water) W from slowing down or stagnating in the first fluid inflow portion 301 of the second heat-conducting plate. In the same way, the asymmetrically shaped flat portion 35 can also be formed in the first fluid outflow portion 302 of the second heat-conducting plate.

[0316] According to a preferred embodiment, a protrusion 36 may also be provided on the flat portion 35. The protrusion 36 protrudes from a predetermined position on the flat portion 35 to prevent the flow of the first fluid (e.g., water) W from stagnating, thereby preventing eddies and guiding the flow direction of the first fluid (e.g., water) W. The protrusion 36 may have various shapes, including cylindrical or polygonal prism shapes.

[0317] According to one embodiment, the second heat-conducting plate 30 may have a dead zone 32, which is a non-flow path region formed outside the second heat-conducting region 31 where fluid does not flow.

[0318] Reference Figure 6 and Figure 7 The dead zone 32 of the second heat-conducting plate 30 can be located in the right-hand region S2 of each of the upper and lower ends of the second heat-conducting region 31 of the second heat-conducting plate 30 along its length. The first fluid W will not flow into the dead zone 32 of the second heat-conducting plate 30.

[0319] The dead zone 32 of the second heat-conducting plate 30 can be formed at the corner position adjacent to the second fluid inflow portion 303 and the second fluid outflow portion 304 of the second heat-conducting plate into which the second fluid (e.g., refrigerant, etc.) R flows.

[0320] According to a preferred embodiment, a second flange 37 may also be provided along the edge of the second heat-conducting plate 30. Furthermore, each corner of the second heat-conducting plate 30 may have an arc shape.

[0321] The dead zone hole 33 of the second heat-conducting plate 30 can be formed by penetrating along the thickness direction and being disposed in the dead zone 32 of the corner adjacent to the second fluid inflow portion 303 of the second heat-conducting plate (see reference). Figure 6 ).

[0322] Furthermore, the dead zone hole 33 of the second heat-conducting plate 30 can be formed by penetrating through the dead zone 32 of the corner adjacent to the second fluid outflow portion 304 of the second heat-conducting plate along the thickness direction (see reference). Figure 7 ).

[0323] According to a preferred embodiment, the dead zone hole 33 can be configured to be spaced apart from the second fluid inflow portion 303 and the second fluid outflow portion 304 of the second heat-conducting plate by a predetermined distance HL. Furthermore, the dead zone hole 33 can be configured close to the second flange portion 37 with its arc-shaped angular shape surrounding the second heat-conducting plate 30. Therefore, even if a dead zone hole is formed in the relatively thin second heat-conducting plate 30, the necessary rigidity can be maintained.

[0324] [Stacked structure of second cover, second heat-conducting plate, and first heat-conducting plate]

[0325] Figure 8 This is an exploded perspective view of the first heat-conducting plate, the second heat-conducting plate, and the second cover in a plate heat exchanger according to one embodiment, along the stacking direction. Figures 9 to 11 This is a diagram that roughly shows the location of the second cover and the cover hole.

[0326] Reference Figure 8 The first heat-conducting plate 20, the second heat-conducting plate 30, and the second cover 60 can be stacked together along the stacking direction.

[0327] According to one embodiment, the dead zone 22 of the first heat-conducting plate 20 and the dead zone 32 of the second heat-conducting plate 30 can be stacked and combined to overlap each other.

[0328] The second cover 60 includes a plurality of cover holes 63 (see reference) Figures 9 to 11 ).

[0329] The position of each of the plurality of cover holes 63 can be formed corresponding to the position of the dead zone holes 23 and 33 of the respective first and second heat-conducting plates 20 and 30 (see reference). Figure 8 ).

[0330] Furthermore, in the first and second heat-conducting plates 20 and 30 where the dead zones 22 and 32 overlap and combine with each other, the dead zone holes 23 of the first heat-conducting plate 20 and the dead zone holes 33 of the second heat-conducting plate 30 are formed to face each other at the same position.

[0331] Reference Figure 8 The cover hole 63 formed in the second cover 60, the dead zone hole 23 of the first heat-conducting plate 20, and the dead zone hole 33 of the second heat-conducting plate 30 can be connected in the same position along the stacking direction. As a result, when inspection gas G is injected from the outside through the cover hole 63, the injected inspection gas G flows into the dead zones 22 and 32 through the respective dead zone holes 23 and 33, thereby allowing the airtightness of the dead zones to be checked. Thus, even without forming gas injection holes in the thinner heat-conducting plates, the airtightness of the dead zones of the plate heat exchanger can be checked.

[0332] According to one embodiment, the first and second heat-conducting plates 20 and 30 can be alternately stacked and brazed together along the stacking direction. At this time, the periphery of the dead zones 22 and 32 formed in each of the first and second heat-conducting plates 20 and 30 can be brazed together.

[0333] [Dead Zone Airtightness Inspection]

[0334] After the first and second heat-conducting plates 20 and 30 are brazed together, the airtightness of the dead zones 22 and 32 can be checked before the plate heat exchanger leaves the factory.

[0335] Dead zones 22 and 32 are areas where no fluid flows. However, if poor brazing occurs around the periphery of dead zones 22 and 32, they may not be able to maintain an airtight seal. In this case, gaps may form between dead zones 22 and 32 and the flow path of the high-temperature first fluid (e.g., water), allowing the high-temperature first fluid (e.g., water) to flow into dead zones 22 and 32.

[0336] However, low-temperature channels for the inflow and outflow of the second fluid are arranged near the dead zones 22 and 32 (i.e., the second fluid inflow section of the first heat-conducting plate, the second fluid outflow section of the first heat-conducting plate, the second fluid inflow section of the second heat-conducting plate, and the second fluid outflow section of the second heat-conducting plate).

[0337] Therefore, the first fluid (e.g., water) flowing into and stagnating in dead zones 22 and 32 may freeze and cause cracking due to the influence of the surrounding low-temperature second fluid (e.g., refrigerant). This can lead to serious damage and breakage of the plate heat exchanger. Therefore, after brazing and before the plate heat exchanger leaves the factory, a leak test of dead zones 22 and 32 can be performed to detect any defects.

[0338] Figure 12 and Figure 13 An embodiment is shown showing the operation of injecting inspection gas through the cover hole of the second cover.

[0339] Inspection gas G can be injected from the outside into the interior of the plate heat exchanger through the cover hole 63.

[0340] According to a preferred embodiment, the gas G used for inspection can be air, helium, etc.

[0341] Inspection gas G injected into the interior of the plate heat exchanger 1 through the cover hole 63 can be transmitted through dead zone holes 23 and 33 of the first and second heat-conducting plates 20 and 30, which are connected at the same location as the cover hole 63 (see reference). Figure 8 The gas flows into the dead zone. Afterwards, it can be confirmed whether the inspection gas G flows into the first fluid (e.g., water) through the dead zone. In this way, the airtightness of the dead zone can be checked, and poor brazing at the periphery of the dead zone can be identified in advance.

[0342] As a result, brazing defects can be identified in advance before the plate heat exchanger leaves the factory, thereby improving product reliability.

[0343] Figure 12 The illustration shows the situation where inspection gas G is injected through a cover hole 63 formed at the upper end of the plate heat exchanger 1 along its length, i.e., at the upper end of the second cover 60. Figure 13 The illustration shows the injection of inspection gas G through a cover hole 63 formed at the lower end of the plate heat exchanger 1 along its length, i.e., at the lower end of the second cover 60.

[0344]

Sealing Structure

[0345] Figure 14 and Figure 15 This diagram illustrates an embodiment of a structure in which, after performing an airtightness check on the dead zone, a sealing portion is used to seal the cover hole to prevent the intrusion of external moisture.

[0346] Figure 14 The diagram shows a structure that uses sealing portions 90 (91, 92, 93) to block the cover hole 63 formed at the upper end of the plate heat exchanger 1 along its length, i.e. the upper end of the second cover 60, to prevent the intrusion of external air.

[0347] Figure 15 The diagram shows a structure that uses sealing portions 90 (91, 92, 93) to block the cover hole 63 formed at the lower end of the second cover 60 along the length of the plate heat exchanger 1 to prevent the intrusion of external air.

[0348] If the results of the airtightness check of the dead zone are confirmed by injecting gas G into the cover hole 63, and the brazing of the dead zone periphery is not defective, the operation of sealing the cover hole 63 with the sealing part 90 can be carried out.

[0349] The sealing part 90 serves to block the cover hole 63 after the airtightness check in the dead zone, thereby preventing external air from entering the interior of the plate heat exchanger. The cover hole 63 is isolated from the outside by the sealing part 90, and external air can no longer enter the interior of the plate heat exchanger through the cover hole 63.

[0350] The outside air may contain a certain amount of moisture. If the outside air flows in through the cover hole 63, the outside moisture contained in the outside air may enter the dead zone through the dead zone hole that communicates with the cover hole 63.

[0351] If external moisture intrudes into the dead zone, it may freeze in the dead zone due to the influence of the low-temperature secondary fluid (e.g., refrigerant), potentially causing a freezing and cracking accident. Therefore, after the airtightness check of the dead zone, it is necessary to plug the cover hole 63 using the sealing part 90.

[0352] The sealing part 90 can be formed using various sealing means (or sealing methods) that can block the cover hole 63 formed in the second cover 60.

[0353] According to a preferred embodiment, the sealing portion 90 may include a plug 91 that physically blocks the cover hole 63 to isolate the cover hole 63 from the outside.

[0354] The plug 91 can be of various shapes and can be inserted into the cover hole 63 to block the cover hole 63 by means of threaded fastening, interference fit, etc. The plug 91 can block the cover hole 63 to completely prevent external air from entering through the cover hole 63 after the airtightness check of the dead zone.

[0355] According to another preferred embodiment, the sealing portion 90 may include a welded sealing portion 92. The welded sealing portion 92 refers to a sealing structure that uses various welding materials to weld the cover hole 63 to plug the cover hole 63.

[0356] The second cover 60 is thicker than the first and second heat-conducting plates 20 and 30, and is made of SUS304 material, thus exhibiting excellent weldability. Therefore, the cover hole 63 formed in the second cover 60 can be directly welded to block the cover hole 63.

[0357] According to another preferred embodiment, the sealing portion 90 includes a sealing portion 93. The sealing portion 93 refers to a sealing structure that blocks the cover hole 63 by injecting various sealing materials (e.g., silicon) into the interior of the cover hole 63.

[0358] After the airtightness check of the dead zone, the sealing part 93 can quickly plug the cover hole 63 by easily injecting sealing material into it.

[0359] By using various sealing parts 90 (91, 92, 93) to block the cover hole 63, it is possible to prevent external air from entering the interior of the plate heat exchanger after the dead zone inspection. As a result, it is possible to prevent icing and freezing cracks that may occur due to external moisture entering the dead zone in advance.

[0360] As described above, the present invention has been described with reference to the exemplary accompanying drawings. However, the present invention is not limited to the embodiments and drawings disclosed in this specification, and those skilled in the art can make various modifications within the scope of the technical concept of the present invention. Furthermore, it should be understood that although the effects of the configuration according to the present invention have not been explicitly described in the above description of the embodiments, it should be acknowledged that the effects can be predicted through the corresponding configuration.

Claims

1. A plate heat exchanger, wherein Comprising: a heat conducting plate joint body including a plurality of heat conducting plates stacked on each other, the plurality of heat conducting plates allowing a first fluid and a second fluid having a lower temperature than the first fluid to flow to respective heat conducting regions, so that the first fluid and the second fluid exchange heat; a first cover coupled to one side of the heat conducting plate joint body, capable of allowing the first fluid to flow in and out from and to the outside, and capable of allowing the second fluid to flow in and out from and to the outside; and a second cover coupled to the other side of the heat conducting plate joint body; the plurality of heat conducting plates including: a first heat conducting plate having a first heat conducting region in which a first flow path for the flow of the first fluid is formed; and a second heat conducting plate alternately stacked and coupled with the first heat conducting plate, having a second heat conducting region in which a second flow path for the flow of the second fluid is formed; the first heat conducting plate and the second heat conducting plate each having a dead zone in which the inflow of the first fluid and the second fluid is blocked; the second cover being provided with a cover hole through which gas can be injected from the outside, and at least one dead zone hole provided in the dead zone, the gas injected into the cover hole flowing into the dead zone hole.

2. The plate heat exchanger according to claim 1, wherein the first cover allows the first fluid to flow in from the outside, and allows the first fluid whose heat exchange is completed to flow out to the outside; the first cover allows the second fluid to flow in from the outside, and allows the second fluid whose heat exchange is completed to flow out to the outside, using a different path from the first fluid; the cover hole is formed through the thickness direction of the second cover; the cover hole is formed to face the dead zone hole at the same position; the diameters of the cover hole and the dead zone hole are the same as each other, or the diameter of the cover hole is larger than the diameter of the dead zone hole.

3. The plate heat exchanger according to claim 1, wherein the first heat conducting plate and the second heat conducting plate are made of a first material; the second cover is made of a second material, the strength of the second material being higher than that of the first material; the first heat conducting plate and the second heat conducting plate have a first thickness; the second cover has a second thickness, and the second thickness is thicker than the first thickness.

4. The plate heat exchanger according to claim 1, wherein the first heat conducting plate and the second heat conducting plate are made of SUS316L, and the second cover is made of SUS304; the second cover has a thickness of 5 to 7 times the thickness of the first heat conducting plate and the second heat conducting plate.

5. The plate heat exchanger according to claim 1, wherein the first cover includes: a first fluid external inflow portion allowing the first fluid to flow from the outside of the first cover to the heat conducting plate joint body; a first fluid external outflow portion allowing the first fluid whose heat exchange is completed to flow from the heat conducting plate joint body to the outside of the first cover; a second fluid external inflow portion allowing the second fluid to flow from the outside of the first cover to the heat conducting plate joint body; and The second fluid external outlet allows the second fluid, after heat exchange is complete, to flow out from the heat-conducting plate joint to the outside of the first cover.

6. The plate heat exchanger according to claim 1, characterized in that, The first heat-conducting plate includes: The first heat-conducting plate has a first fluid inflow section located at one end of the length direction of the first heat-conducting area and connected to the first flow path, so that the first fluid can flow in. The first fluid outlet of the first heat-conducting plate is located at the other end of the length direction of the first heat-conducting area and is connected to the first flow path to allow the first fluid to flow out. The second fluid inlet portion of the first heat-conducting plate is spaced apart from the first fluid outlet portion of the first heat-conducting plate in the width direction of the first heat-conducting region, and is isolated from the first flow path, allowing the second fluid to flow in; and The second fluid outlet of the first heat-conducting plate is arranged separately from the first fluid inlet of the first heat-conducting plate in the width direction of the first heat-conducting area and is isolated from the first flow path, so that the second fluid flows out. The dead zone hole penetrates along the thickness direction and is located close to the second fluid inflow portion and the second fluid outflow portion of the first heat-conducting plate.

7. The plate heat exchanger according to claim 6, characterized in that, The second heat-conducting plate includes: The second heat-conducting plate has a second fluid inflow section located at the other end of the length direction of the second heat-conducting region and connected to the second flow path, allowing the second fluid to flow in. The second heat-conducting plate has a second fluid outlet located at one end of the length direction of the second heat-conducting region and connected to the second flow path, so that the second fluid can flow out. The first fluid inlet portion of the second heat-conducting plate is spaced apart from the second fluid outlet portion of the second heat-conducting plate in the width direction of the second heat-conducting region, and is isolated from the second flow path, allowing the first fluid to flow in; and The first fluid outlet of the second heat-conducting plate is spaced apart from the second fluid inlet of the second heat-conducting plate in the width direction of the second heat-conducting region, and is isolated from the second flow path, so that the first fluid flows out. The dead zone hole penetrates along the thickness direction and is located close to the second fluid inflow portion and the second fluid outflow portion of the second heat-conducting plate.

8. The plate heat exchanger according to claim 7, characterized in that, When stacking the first heat-conducting plate and the second heat-conducting plate, the dead zones respectively disposed on the first heat-conducting plate and the second heat-conducting plate overlap and combine with each other; The dead zone holes respectively disposed in the dead zones of the first heat-conducting plate and the second heat-conducting plate are formed facing each other at the same position and are interconnected with each other along the stacking direction.

9. The plate heat exchanger according to claim 7, characterized in that, A first flange is provided along the edge of the first heat-conducting plate; The first heat-conducting plate has an arc-shaped corner, and the dead zone hole of the first heat-conducting plate is configured close to the arc-shaped corner of the first heat-conducting plate and close to the first flange portion surrounding the arc-shaped corner. A second flange is provided along the edge of the second heat-conducting plate; The second heat-conducting plate has an arc-shaped corner, and the dead zone hole of the second heat-conducting plate is configured close to the arc-shaped corner of the second heat-conducting plate and close to the second flange portion surrounding the arc-shaped corner.

10. The plate heat exchanger according to claim 1, characterized in that, During the airtightness check of the dead zone, If gas is injected into the cover hole, the injected gas flows into the dead zone through the dead zone hole. The airtightness of the dead zone is checked by confirming whether the inflowing gas flows between the dead zone and the first flow path. Based on the airtightness test results of the dead zone, check for poor brazing bonding around the dead zone; The plate heat exchanger also includes a plug that seals the cover hole. After the airtightness check of the dead zone, the plug is engaged with the cover hole to block it, thereby preventing external moisture from entering the interior of the cover hole.

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