Parallel tube type heat exchanger
Through the parallel flow and temperature-controlled valve intelligent control of the parallel tube heat exchanger, the problem that traditional radiators are difficult to meet the heat dissipation needs of the lubricant system under severe flight conditions is solved, and the intelligent thermal management and operation of the lubricant system is realized. Improved economy.
Patent Information
- Application Number
- CN202411550593.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-01-07
AI Technical Summary
Traditional tube-type fuel oil radiators are difficult to meet the heat dissipation needs of the oil system under severe flight conditions, resulting in an increase in the volume and weight of the equipment or the structure of the oil system, an increase in flow resistance, affecting the economics of the engine operation.
A parallel tube heat exchanger is designed to adjust the operating status and flow resistance of the lubricant system in real time through the parallel flow of the thermal edge medium cavity A and B and the intelligent control of the temperature-controlled shutter, so as to realize intelligent thermal management.
It greatly improves the economical operation of the system, reduces the flow resistance and volume of the heat exchanger, and improves the engine's work-to-weight ratio and structure efficiency.
Smart Images
Figure CN119268406A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of heat exchangers for lubrication systems of aircraft engines, and in particular relates to a parallel shell-and-tube heat exchanger. Background Art
[0002] Since helicopters have fewer fuel heat sinks available, they are insufficient to meet the heat dissipation requirements of the lubricating oil system under some harsh flight conditions. At the same time, as the engine power increases, the power extracted by accessories such as the engine increases, resulting in increased engine heat generation and increased heat dissipation requirements for the lubricating oil system. Under most flight conditions, traditional tube-type fuel and lubricating oil radiators can meet the heat dissipation requirements of the lubricating oil system. However, under certain flight conditions where the engine heat generation is relatively high, traditional tube-type radiators will find it difficult to meet the heat dissipation requirements of the lubricating oil system.
[0003] In order to meet the heat dissipation requirements under harsh flight conditions, the existing technology enlarges the fuel and lubricating oil radiator, which will lead to a sharp increase in the volume and weight of the fuel and lubricating oil radiator and reduce the power-to-weight ratio of the engine; or directly connect an air and lubricating oil radiator in series downstream of the fuel and lubricating oil radiator, which will lead to an increase in the lubricating oil system pipelines, a bloated structure, a longer lubricating oil flow path, a sharp increase in system flow resistance, and poor engine operation economy. Summary of the invention
[0004] The purpose of the present invention is to provide a parallel shell-and-tube heat exchanger that can adjust the operating state and flow resistance of the lubricating oil system in real time according to the heat dissipation requirements of the engine lubricating oil system, and perform intelligent thermal management on the lubricating oil system.
[0005] The technical scheme of the present invention is: a parallel shell-and-tube heat exchanger, comprising a shell (1), wherein a hot side medium cavity A and a hot side medium cavity B are arranged side by side in the shell (1), a core assembly A and a core assembly B are arranged in the hot side medium cavities A and B respectively, a hot side medium channel is arranged in the shell between the hot side medium cavities A and B, one end of the hot side medium channel is a hot side medium inlet, and the other end is respectively connected to the hot side medium cavities A and B; a cover is arranged at the end of the shell, and the cavity formed by the shell and the cover is separated into a cold side medium cavity A, a cold side medium cavity B and a cold side medium cavity C along the arrangement direction of the hot side medium cavities A and B through a partition A and a partition B, and the cold side medium cavities A and C are respectively connected to the cold side medium inlet and outlet; the hot side medium cavities A and B outlets are both connected to the hot side medium mixing cavity, and the hot side medium mixing cavity is connected to the hot side medium outlet; the cold side medium flows through the cold side medium cavity A, the core assembly A, the cold side medium cavity B, the core assembly B and the cold side medium cavity C in sequence and then flows out from the cold side medium outlet.
[0006] In the aforementioned parallel shell-and-tube heat exchanger, the hot side medium outlet includes hot side medium outlet A and hot side medium outlet B. The on-off of hot side medium outlets A and B is controlled by a temperature control valve. When the hot side medium outlets A / B are in a connected state, the hot side medium outlets B / A are in a closed state.
[0007] In the aforementioned parallel shell-and-tube heat exchanger, the temperature control valve comprises a valve seat, a valve and a temperature sensing rod, and the valve seat is provided with a valve outlet cavity A, a valve inlet cavity and a valve outlet cavity B in sequence along the axial direction; a valve port A is provided between the valve outlet cavity A and the valve inlet cavity, a valve port B is provided between the valve inlet cavity and the valve outlet cavity B, and the valve ports A and B are coaxially arranged; the valve is provided with a valve core A and a valve core B in sequence along the axial direction, and the valve cores A and B are correspondingly slidably connected to the valve ports A and B; one end of the temperature sensing rod is connected to the valve core A, and the other end passes through the valve core B and is connected to one end of the valve seat; the valve core A is also connected to the other end of the valve seat via a reset spring; the valve outlet cavity A is connected to the hot side medium outlet A, the valve inlet cavity is connected to the hot side medium mixing chamber, and the valve outlet cavity B is connected to the hot side medium outlet B.
[0008] In the aforementioned parallel shell-and-tube heat exchanger, the core assembly A comprises an end plate A, on which a heat dissipation shell-and-tube assembly A is mounted, more than one baffle period is arranged along the axial direction of the heat dissipation shell-and-tube assembly A, and a baffle assembly is arranged for each baffle period, the baffle assembly comprises a pair of baffles AⅠ, a baffle AⅡ is arranged between the two baffles AⅠ, and a baffle AⅢ is arranged on the outer side of the baffle AⅠ away from the end plate A; the baffle AⅠ is connected to the shell via a connecting rib I protruding from its outer edge, and a flow hole I is arranged in the middle of the baffle AⅠ; the outer edge of the baffle AⅡ is connected to the shell, and a flow hole II is arranged in the middle of the baffle AⅡ; the baffle AⅢ is connected to the shell via a connecting rib II protruding from its outer edge; the heat dissipation shell-and-tube assembly A passes through the baffles AⅠ, AⅡ, and AⅢ.
[0009] In the aforementioned parallel shell-and-tube heat exchanger, the baffle components in the core assembly A and the core assembly B have the same structure.
[0010] In the aforementioned parallel shell-and-tube heat exchanger, the heat dissipation shell-and-tube assembly A in the core assembly A has 4 flows, and the heat dissipation shell-and-tube assembly B in the core assembly B has 2 flows.
[0011] In the aforementioned parallel shell-and-tube heat exchanger, a safety valve is provided on the hot side medium channel.
[0012] In the aforementioned parallel shell-and-tube heat exchanger, an exhaust valve is provided on the cold side medium chamber A.
[0013] In the aforementioned parallel shell-and-tube heat exchanger, the mating surfaces between the shell and the cover are in an "8"-shaped structure.
[0014] The advantages of the present invention are as follows: the present invention proposes a fuel and lubricating oil radiator which can adjust the operating state and flow resistance of the lubricating oil system in real time according to the heat dissipation requirements of the engine lubricating oil system, and perform intelligent thermal management of the lubricating oil system. The radiator has the advantages of integration and high efficiency, and greatly improves the economy of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the present invention;
[0016] Figure 2 It is a schematic diagram of the internal structure of the present invention;
[0017] Figure 3 for Figure 1 Right side view after removing the cover;
[0018] Figure 4 It is a schematic diagram of the core component A;
[0019] Figure 5 Schematic diagram of the temperature control valve. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0021] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.
[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0023] Example 1. A parallel shell-and-tube heat exchanger, see Figure 1-5, comprising a shell 1, wherein a hot side medium cavity A2 and a hot side medium cavity B3 are arranged side by side in the shell 1, a core assembly A4 and a core assembly B5 are arranged in the hot side medium cavities A and B respectively, a hot side medium channel 6 is arranged in the shell between the hot side medium cavities A and B, one end of the hot side medium channel 6 is a hot side medium inlet, and the other end is connected to the hot side medium cavities A and B respectively; a cover 7 is arranged at the end of the shell 1, and the cavity formed by the shell 1 and the cover 7 is connected along the arrangement direction of the hot side medium cavities A and B through the partition A 8. The partition B9 is separated into the cold side medium cavity A10, the cold side medium cavity B11 and the cold side medium cavity C12. The cold side medium cavities A and C are connected with the cold side medium inlet and outlet respectively; the hot side medium cavities A and B outlets are connected with the hot side medium mixing cavity 13, and the hot side medium mixing cavity 13 is connected with the hot side medium outlet; the cold side medium flows through the cold side medium cavity A10, the core assembly A4, the cold side medium cavity B11, the core assembly B5 and the cold side medium cavity C12 in sequence and then flows out from the cold side medium outlet.
[0024] The hot side medium enters the hot side medium channel 6 from the hot side medium inlet, enters the hot side medium cavity A2 and the hot side medium cavity B3 respectively, flows outside the tubes of the core assembly A4 and the core assembly B5, enters the hot side medium mixing cavity 13 after heat exchange with the cold side medium in the tube, and flows out from the hot side medium outlet after mixing; the cold side medium enters the cold side medium cavity A10 from the cold side medium inlet, and then flows through the core assembly A4, the cold side medium cavity B11 and the core assembly B5 in turn, exchanges heat with the hot side medium flowing outside the tubes of the core assembly A4 and the core assembly B5 in turn, enters the cold side medium cavity C12, and flows out from the cold side medium outlet.
[0025] The hot side medium flows in the hot side medium cavity A2 and the hot side medium cavity B3 in parallel, which can reduce the flow resistance of the hot side medium flowing in the shell 1 by more than 50%, thereby improving the economic efficiency of the heat exchanger operation. The parallel flow form of the shell 1 can be expanded to multiple hot side medium cavities, and multiple cavities can be arranged in a complex space to effectively improve space utilization.
[0026] The aforementioned hot side medium outlets include hot side medium outlet A14 and hot side medium outlet B15. The on and off of hot side medium outlets A and B are controlled by a temperature control valve 16. When the hot side medium outlets A / B are in a connected state, the hot side medium outlets B / A are in a closed state.
[0027] When the temperature of the hot side medium is higher than a certain set value, the temperature control valve 16 controls the hot side medium to flow out from the hot side medium outlet A14 and enter the downstream air radiator to continue cooling the hot side medium and control the hot side medium temperature within an appropriate range; when the temperature of the hot side medium is lower than a certain set value, the temperature control valve 16 controls the hot side medium to flow out from the hot side medium outlet B15. At this time, the hot side medium flows back to the hot side medium box and no longer flows into the downstream air radiator, shortening the hot side medium flow and reducing the hot side flow resistance of the system by about 40%. The temperature control valve 16 intelligently controls the operating status of the system in real time according to the hot side medium temperature, realizes the intelligent thermal management of the system, has the advantages of integration and high efficiency, and greatly improves the economy of system operation.
[0028] The aforementioned temperature control valve 16 comprises a valve seat 16.1, a valve 16.2 and a temperature sensing rod 16.3. The valve seat 16.1 is provided with a valve outlet cavity A16.4, a valve inlet cavity 16.5 and a valve outlet cavity B16.6 in sequence along the axial direction; a valve port A16.7 is provided between the valve outlet cavity A16.4 and the valve inlet cavity 16.5, a valve port B16.8 is provided between the valve inlet cavity 16.5 and the valve outlet cavity B16.6, and the valve ports A and B are coaxially arranged; the valve 16.2 is provided with a valve core A16.9 in sequence along the axial direction And valve core B16.10, valve cores A and B are correspondingly slidably connected to valve ports A and B; one end of temperature sensing rod 16.3 is connected to valve core A16.9, and the other end passes through valve core B16.10 and is connected to one end of valve seat 16.1; valve core A16.9 is also connected to the other end of valve seat 16.1 through reset spring 16.11; valve outlet cavity A16.4 is connected to hot side medium outlet A14, valve inlet cavity 16.5 is connected to hot side medium mixing cavity 13, and valve outlet cavity B16.6 is connected to hot side medium outlet B15.
[0029] The hot side medium enters the valve inlet chamber 16.5 from the hot side medium mixing chamber 13. When the hot side medium temperature is lower than a certain set value, the temperature sensing rod 16.3 does not move, the valve core A16.9 and the valve port A16.7 are in a closed state, and the hot side medium enters the valve outlet chamber B16.6 and flows out from the hot side medium outlet B15. When the hot side medium temperature is higher than a certain set value, the temperature sensing rod 16.3 pushes the valve core A16.9 to move toward the valve outlet chamber A16.4, the valve core B16.10 and the valve port B16.8 are in a closed state, and the valve The core A16.9 and the valve port A16.7 are open, the hot side medium enters the valve outlet cavity A16.4, and flows out from the hot side medium outlet A14; when the hot side medium temperature drops from high temperature to below a certain set value, the valve core A16.9 moves to the valve outlet cavity B16.6 under the action of the reset spring 16.11. At this time, the valve core A16.9 and the valve port A16.7 are closed, the valve core B16.10 and the valve port B16.8 are opened, the hot side medium enters the valve outlet cavity B16.6, and flows out from the hot side medium outlet B15.
[0030] Under the joint action of the temperature sensing rod 16.3 and the reset spring 16.11, the valve core A16.9 and the valve core B16.10 intelligently switch the opening and closing of the valve port A16.7 and the valve port B16.8, and the valve 16.2 reciprocates in the valve seat 16.1 without getting stuck, and the structural reliability is high.
[0031] The core assembly A4 comprises an end plate A4.1, on which a heat dissipation tube assembly A4.2 is mounted, and one or more baffle periods are arranged along the axial direction of the heat dissipation tube assembly A4.2, and each baffle period is provided with a baffle assembly, and the baffle assembly comprises a pair of baffle plates AⅠ4.3, a baffle plate AⅡ4.4 is arranged between the two baffle plates AⅠ4.3, and a baffle plate AⅢ4.4 is arranged on the outer side of the baffle plate AⅠ4.3 away from the end plate A4.1. .5; the baffle AⅠ4.3 is connected to the shell 1 via a connecting rib Ⅰ4.31 protruding from its outer edge, and a flow hole Ⅰ4.32 is provided in the middle of the baffle AⅠ4.3; the outer edge of the baffle AⅡ4.4 is connected to the shell 1, and a flow hole Ⅱ4.41 is provided in the middle of the baffle AⅡ4.4; the baffle AⅢ4.5 is connected to the shell 1 via a connecting rib Ⅱ4.51 protruding from its outer edge; the heat dissipation tube assembly A4.2 passes through the baffles AⅠ, AⅡ, and AⅢ.
[0032] The hot edge medium enters the core assembly A4 from the hot edge medium channel 6, and respectively enters the two sides of the baffle AⅠ4.3 close to the end plate A4.1, flows radially to the center and converges, and respectively flows through the flow hole Ⅰ4.32 and the flow hole Ⅱ4.41 to the two sides of the baffle AⅠ4.3 far away from the end plate A4.1, flows radially to the gap between the heat dissipation tube assembly A4.2 and the shell 1, completes a baffle cycle, and then flows to the next baffle cycle through the gap between the baffle AⅢ4.5 and the shell 1.
[0033] Connecting ribs I4.31 and II4.51 can enhance the supporting effect of baffles AⅠ4.3 and AⅢ4.5 and the shell 1, greatly improve the rigidity of the core assembly A4, and reduce its failure rate during operation; at the same time, the hot edge medium flows in parallel when flowing in the areas on both sides of the baffle AⅠ4.3, reducing the flow velocity of the hot edge medium in the core assembly A4, and can reduce the flow resistance of the hot edge medium in the core assembly A4 by more than about 75%.
[0034] The deflector assembly structure in the aforementioned core assembly A4 is the same as that in the core assembly B5.
[0035] Effect: The flow resistance of the hot edge medium in the core assembly A4 and the core assembly B5 is the same, ensuring that the flow distribution of the hot edge medium from the hot edge medium channel 6 into the hot edge medium cavity A2 and the hot edge medium cavity B3 is uniform.
[0036] The heat dissipation tube assembly A4.2 in the aforementioned core assembly A4 has 4 passes, and the heat dissipation tube assembly B5.1 of the core assembly B5 has 2 passes.
[0037] Since the temperature of the cold-side medium in the core assembly A4 is lower than that in the core assembly B5, the viscosity of the cold-side medium in the core assembly A4 is greater than that in the core assembly B5. Therefore, the Reynolds number of its flow in the core assembly A4 is smaller. Setting the heat dissipation tube assembly A4.2 in the core assembly A4 to 4 passes can increase the Reynolds number of the cold-side medium in the core assembly A4 and improve the heat transfer quantity of the core assembly A4. The heat dissipation tube assembly B5.1 of the core assembly B5 has 2 passes, which can reduce the flow resistance of the cold-side medium in the core assembly B5. The pass design of the core assemblies A and B can not only effectively enhance the heat exchange effect of the cold-side medium but also effectively control the total flow resistance of the cold-side medium cavity.
[0038] A safety valve 17 is provided on the aforementioned hot-side medium channel 6.
[0039] The inlet end of the safety valve 17 is communicated with the hot-side medium inlet, and the outlet end is communicated with the hot-side medium mixing cavity 13. When both the hot-side medium cavity A2 and the hot-side medium cavity B3 are blocked, or when the temperature of the hot-side medium is lower than a certain value, the resistance of the hot-side medium flowing through the core assembly A4 and the core assembly B5 increases. When the flow resistance is greater than the set value of the safety valve 17, the safety valve 17 opens, and the hot-side medium directly enters the hot-side medium mixing cavity 13 from the hot-side medium inlet and flows out from the hot-side medium outlet A14 or the hot-side medium outlet B15 after passing through the temperature control valve 16, playing an overpressure protection function.
[0040] An exhaust valve 18 is provided on the aforementioned cold-side medium cavity A10.
[0041] The exhaust valve 18 is connected to the cover 7 by threads or bolts. When the engine is debugged and tested, the exhaust function of the cold-side medium cavities A, B, and C can be realized through the exhaust valve 18 to prevent the heat exchange effect from being reduced due to gas mixing in the liquid in the cold-side medium cavity.
[0042] The mating surface between the aforementioned housing 1 and the cover 7 has an "8"-shaped structure.
[0043] Compared with the traditional "square"-shaped mating surface, the "8"-shaped mating surface of the housing 1 and the cover 7 can effectively increase the contact area between the two, and at the same time can reduce the stress area of the cover 7. When welding is used for sealing between the two, the "8"-shaped welding structure can effectively increase the weld length and improve the connection strength between the two. The pressure resistance of the cold-side medium cavity of the product can be increased from 12 MPa to more than 20 MPa.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.
Claims
1. A parallel shell-and-tube heat exchanger, characterized in that: The invention comprises a shell (1), wherein a hot side medium cavity A (2) and a hot side medium cavity B (3) are arranged side by side in the shell (1), a core assembly A (4) and a core assembly B (5) are arranged in the hot side medium cavities A and B respectively, a hot side medium channel (6) is arranged in the shell between the hot side medium cavities A and B, one end of the hot side medium channel (6) is a hot side medium inlet, and the other end is connected to the hot side medium cavities A and B respectively; a cover (7) is arranged at the end of the shell (1), and the cavity formed by the shell (1) and the cover (7) is connected along the arrangement direction of the hot side medium cavities A and B through a partition A (8), partition B (9) is separated into cold side medium chamber A (10), cold side medium chamber B (11) and cold side medium chamber C (12), the cold side medium chambers A and C are respectively connected to the cold side medium inlet and outlet; the outlets of the hot side medium chambers A and B are both connected to the hot side medium mixing chamber (13), and the hot side medium mixing chamber (13) is connected to the hot side medium outlet; the cold side medium flows through the cold side medium chamber A (10), the core assembly A (4), the cold side medium chamber B (11), the core assembly B (5), and the cold side medium chamber C (12) in sequence, and then flows out from the cold side medium outlet.
2. The parallel shell-and-tube heat exchanger according to claim 1, characterized in that: The hot side medium outlet comprises a hot side medium outlet A (14) and a hot side medium outlet B (15). The hot side medium outlets A and B are switched on and off by a temperature control valve (16). When the hot side medium outlets A / B are in a connected state, the hot side medium outlets B / A are in a closed state.
3. The parallel shell-and-tube heat exchanger according to claim 2, characterized in that: The temperature control valve (16) comprises a valve seat (16.1), a valve (16.2) and a temperature sensing rod (16.3); the valve seat (16.1) is provided with a valve outlet cavity A (16.4), a valve inlet cavity (16.5) and a valve outlet cavity B (16.6) in sequence along the axial direction; a valve port A (16.7) is provided between the valve outlet cavity A (16.4) and the valve inlet cavity (16.5); a valve port B (16.8) is provided between the valve inlet cavity (16.5) and the valve outlet cavity B (16.6); the valve ports A and B are coaxially arranged; the valve (16.2) is provided with a valve core A (16. 9) and valve core B (16.10), valve cores A and B are slidably connected to valve ports A and B respectively; one end of the temperature sensing rod (16.3) is connected to valve core A (16.9), and the other end passes through valve core B (16.10) and is connected to one end of valve seat (16.1); valve core A (16.9) is also connected to the other end of valve seat (16.1) via a return spring (16.11); valve outlet chamber A (16.4) is connected to hot side medium outlet A (14), valve inlet chamber (16.5) is connected to hot side medium mixing chamber (13), and valve outlet chamber B (16.6) is connected to hot side medium outlet B (15).
4. The parallel shell-and-tube heat exchanger according to claim 1, characterized in that: The core assembly A (4) comprises an end plate A (4.1), a heat dissipation tube assembly A (4.2) is mounted on the end plate A (4.1), one or more baffle periods are arranged along the axial direction of the heat dissipation tube assembly A (4.2), each baffle period is provided with a baffle assembly, the baffle assembly comprises a pair of baffle plates AⅠ (4.3), a baffle plate AⅡ (4.4) is arranged between the two baffle plates AⅠ (4.3), and a baffle plate AⅢ (4.5) is arranged on the outer side of the baffle plate AⅠ (4.3) away from the end plate A (4.1) ; The baffle AⅠ (4.3) is connected to the shell (1) via a connecting rib Ⅰ (4.31) protruding from its outer edge, and a flow hole Ⅰ (4.32) is provided in the middle of the baffle AⅠ (4.3); the outer edge of the baffle AⅡ (4.4) is connected to the shell (1), and a flow hole Ⅱ (4.41) is provided in the middle of the baffle AⅡ (4.4); the baffle AⅢ (4.5) is connected to the shell (1) via a connecting rib Ⅱ (4.51) protruding from its outer edge; the heat dissipation tube assembly A (4.2) passes through the baffles AⅠ, AⅡ, and AⅢ.
5. The parallel shell-and-tube heat exchanger according to claim 4, characterized in that: The deflection assembly structure in the core assembly A (4) is the same as that in the core assembly B (5).
6. The parallel shell-and-tube heat exchanger according to claim 4, characterized in that: The heat dissipation tube assembly A (4.2) in the core assembly A (4) has four flows, and the heat dissipation tube assembly B (5.1) in the core assembly B (5) has two flows.
7. The parallel shell-and-tube heat exchanger according to claim 1, characterized in that: A safety valve (17) is provided on the hot side medium channel (6).
8. The parallel shell-and-tube heat exchanger according to claim 1, characterized in that: An exhaust valve (18) is provided on the cold side medium chamber A (10).
9. The parallel shell-and-tube heat exchanger according to claim 1, characterized in that: The mating surfaces between the shell (1) and the sealing cover (7) are in an "8"-shaped structure.