Anti-freezing heat exchanger
By changing the arrangement of the inlet and outlet water manifolds of the heat exchanger and adding a lower insulation baffle, the problem of the heat exchanger freezing and cracking at extreme low temperatures was solved, achieving an antifreeze effect and ensuring the normal operation of the heat exchanger in frigid environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU NUCLEAR POWER CORP
- Filing Date
- 2025-07-08
- Publication Date
- 2026-07-10
AI Technical Summary
The problem of heat exchangers freezing and cracking in winter, especially in extreme low temperatures or when the water pump stops, causes the liquid temperature inside the heat exchange tubes to drop below the freezing point, resulting in pipe damage.
An antifreeze heat exchanger was designed. By changing the arrangement order of the inlet and outlet water manifolds, the high-temperature fluid exchanges heat with the low-temperature air first. An additional insulation baffle is added below to reduce the contact between the low-temperature air and the temperature difference between the inside and outside of the pipe, thereby improving the antifreeze capability.
It effectively prevents heat exchange tubes from freezing and cracking in extremely cold environments, ensures the normal operation of the heat exchanger, provides maintenance time, and improves the antifreeze performance of the heat exchanger.
Smart Images
Figure CN224479875U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchanger technology, and in particular to an antifreeze heat exchanger. Background Technology
[0002] A heat exchanger is an energy-saving device that enables heat transfer between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified parameters to meet process requirements and improve energy efficiency.
[0003] The heat exchanger in the air conditioning system cools or heats the air flowing outside the tubes through the liquid medium (chilled water or hot water) inside the heat exchange tubes, and then the treated air is delivered to the place of use by the fan.
[0004] Normally, to improve heat exchange, the coil circuits of heat exchangers in air conditioning systems are arranged in a counter-current manner, maintaining a high temperature difference between the fluids inside and outside the heat exchange tubes. However, in winter, because the medium flowing inside the heat exchanger is liquid, in extreme cold weather, when the ambient temperature is far below the freezing point of the medium, the liquid flow rate inside the heat exchanger cannot counteract the freezing rate. Alternatively, in normal cold weather, if the water pump unexpectedly stops, liquid may accumulate in the heat exchange tubes below the heat exchanger, ceasing flow. Both of these situations cause the liquid inside the heat exchange tubes to solidify and expand below the freezing point of the medium, leading to the heat exchange tubes bursting and causing damage to the user. Utility Model Content
[0005] The purpose of this invention is to provide an antifreeze heat exchanger that solves the problem of heat exchange tubes easily freezing and cracking in winter.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] An antifreeze heat exchanger includes a heat exchanger shell and a plurality of coiled flow circuits disposed therein. The inlet of each coiled flow circuit is connected to an inlet manifold, and the outlet is connected to an outlet manifold. The inlet manifold and the outlet manifold are arranged on the side of the heat exchanger shell, with the inlet manifold located in front of the outlet manifold. A lower heat insulation baffle is provided below the air inlet side of the heat exchanger shell, and the heat exchange tube with the inlet is arranged in front of the heat exchange tube with the outlet.
[0008] In some embodiments, a straight inlet pipe is connected above the water inlet manifold, and the straight inlet pipe is connected to the water inlet port.
[0009] In some embodiments, the inlet straight pipe is arranged vertically and forms an L-shape with the inlet manifold.
[0010] In some embodiments, a straight water outlet pipe is connected above the water outlet collection pipe, and the straight water outlet pipe is connected to the water outlet.
[0011] In some embodiments, the straight outlet pipe is arranged vertically and forms an L-shape with the outlet manifold.
[0012] In some embodiments, the lower insulation baffle is a square insulation board filled with insulation material.
[0013] In some embodiments, the height of the lower insulation baffle is 60cm to 80cm.
[0014] In some embodiments, the lower insulation baffle is connected to the heat exchanger housing by bolts.
[0015] In some embodiments, the inlet manifold is located below the side of the heat exchanger housing.
[0016] In some embodiments, the outlet water collection pipe is located above the side of the heat exchanger housing.
[0017] Compared with the prior art, the antifreeze heat exchanger provided by this utility model has the following beneficial effects:
[0018] The antifreeze heat exchanger provided by this utility model can reduce the temperature difference between the fluid inside and outside the tube, provide windproof insulation for the heat exchange tube below, improve the antifreeze capability of the heat exchange tube in case of emergencies, and ensure that the heat exchanger will not be frozen and cracked in severe cold environments.
[0019] Furthermore, this antifreeze heat exchanger changes the contact sequence between the inlet and outlet water manifolds and the low-temperature air (the low-temperature air contacts the inlet and outlet water manifolds first), so that the initial high-temperature fluid in the heat exchange tubes exchanges heat with the initial low-temperature air first, thereby increasing the temperature of the low-temperature air entering the heat exchanger more quickly, reducing the temperature difference between the fluids inside and outside the subsequent heat exchange tubes, and improving the antifreeze capability of the heat exchange tubes.
[0020] Furthermore, this antifreeze heat exchanger has an insulation baffle installed below the air inlet side of the heat exchanger shell. When the water pump stops, the lower heat exchange tube, where liquid has settled inside, reduces direct contact with the low-temperature air, thus providing insulation for the lower heat exchange tube and improving its antifreeze capability. Attached Figure Description
[0021] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the technical description will be briefly introduced below.
[0022] Figure 1 A schematic diagram of the antifreeze heat exchanger provided by this utility model;
[0023] Figure 2Another structural schematic diagram of the antifreeze heat exchanger provided by this utility model;
[0024] Figure 3 A schematic diagram of a coiled flow circuit that conceals the inlet and outlet water collection pipes, provided for this utility model;
[0025] Figure 4 A schematic diagram of the coil-flow circuit provided by this utility model.
[0026] Explanation of reference numerals in the attached figures:
[0027] 1. Shell; 2. Inlet water collection pipe; 3. Outlet water collection pipe; 4. Lower insulation baffle; 5. Coil flow circuit. Detailed Implementation
[0028] The following detailed description provides further details on specific implementation methods.
[0029] like Figure 1 and Figure 2 As shown, this application provides an antifreeze heat exchanger, including a heat exchanger shell 1, an inlet water manifold 2, an outlet water manifold 3, a lower insulation baffle 4, and several coil-flow loops 5 (composed of multiple U-shaped corrugated structures). The lower insulation baffle 4 is located below the air inlet side of the heat exchanger shell 1. The coil-flow loops 5 are connected to the inlet water manifold 2 and the outlet water manifold 3, meaning one end of the coil-flow loop 5 is connected to the inlet water manifold 2, and the other end is connected to the outlet water manifold 3. This application defines the position of the lower insulation baffle 4 as the front side / front.
[0030] like Figures 2 to 4 As shown, the structure of the coil-flow loop 5 is composed of multiple U-shaped wave-shaped connections. It is connected to the inlet manifold 2 and the outlet manifold 3 through several coil-flow loops 5 to form a whole.
[0031] The inlet manifold 2 is connected to a vertically arranged straight inlet pipe, which is connected to the inlet of the coil flow circuit 5. For example... Figure 3 As shown, there are 9 water inlet pipes. As shown, the inlet manifold 2 and the inlet straight pipe form an L-shaped pipe structure.
[0032] The outlet manifold 3 is connected to a vertically arranged straight outlet pipe, which is connected to the outlet of the coil-flow loop 5. For example... Figure 3 As shown, there are 9 water outlets, as indicated by ⊙. The water outlet manifold 3 and the straight water outlet pipe form an L-shaped pipe structure.
[0033] The inlet water manifold 2 and the outlet water manifold 3 are arranged on the same side of the heat exchanger shell 1, with the inlet water manifold 2 positioned in front of the outlet water manifold 3, as shown below. Figure 1As shown. The inlet water manifold 2 and the inlet straight pipe are arranged on the side of the heat exchanger shell 1 and close to the air inlet side, while the outlet water manifold 3 and the outlet straight pipe are arranged on the side of the heat exchanger shell 1 and away from the air inlet side, so that the initial high-temperature fluid in the heat exchange tube exchanges heat with the initial low-temperature air first, thereby increasing the temperature of the low-temperature air entering the heat exchanger more quickly.
[0034] The flow direction of the high-temperature fluid is: inlet manifold 2 → inlet straight pipe → inlet port → each coil in the co-current loop 5 → outlet port → outlet straight pipe → outlet manifold 3. It should be noted that this application considers the inflow point of the high-temperature fluid as upstream and the outflow point as downstream. When the high-temperature fluid flows in from the inlet port and enters the heat exchange tubes of the coil in the co-current loop 5, since the heat exchange tubes of the coil in the co-current loop 5 are composed of multiple U-shaped corrugated structures, the upstream heat exchange tubes are preferentially arranged near the air inlet side (e.g., ...). Figure 3 (Positioned on the left side), while the downstream heat exchange tubes are arranged away from the air inlet side, depending on the situation. That is, the higher-temperature heat exchange tubes are preferentially arranged on the air inlet side, so that the initially high-temperature fluid in the heat exchange tubes exchanges heat with the initially low-temperature air first, and then the gradually cooling heat exchange tubes exchange heat with the low-temperature air in turn. As one feasible approach, such as... Figure 3 As shown, the heat exchanger tubes directly connected to the water inlet (or straight water inlet pipe) are arranged closest to the air inlet side, while the heat exchanger tubes directly connected to the water outlet (or straight water outlet pipe) are arranged furthest from the air inlet side. For example... Figure 3 As shown, the water inlet is on the far left and the water outlet is on the far right.
[0035] Optionally, the lower insulation baffle 4 is a square insulation board filled with insulation material and encased in rigid material. The lower insulation baffle 4 is fixed to the lower part of the air inlet side of the shell. The insulation material is a conventional existing insulation material, and the rigid material is a conventional existing rigid material.
[0036] Optionally, the height of the lower insulation baffle 4 can be adjusted according to actual conditions, for example, 60cm to 80cm. The external rigid material can be metal or non-metal, such as stainless steel or PVC plastic.
[0037] Optionally, the lower insulation baffle 4 is detachably fixed to the heat exchanger shell 1 by bolts.
[0038] Optionally, the inlet water manifold 2 is located on the side of the heat exchanger. Figure 1 The lower part of the right side.
[0039] Optionally, the outlet water manifold 3 is located on the side of the heat exchanger. Figure 1 The upper part of the right side.
[0040] like Figure 3 and Figure 4As shown, the air to be heated enters from the inlet manifold 2 and the lower insulation baffle 4 side, exchanges heat with the coil-flow circuit 5, and then exits from the outlet manifold 3 side. High-temperature liquid enters from the inlet manifold 2, exchanges heat with the air to be heated in the coil-flow circuit 5, and then exits from the outlet manifold 3. This ensures that the initial high-temperature fluid in the coil-flow circuit 5 exchanges heat with the initial low-temperature air beforehand, thus rapidly increasing the temperature of the low-temperature air entering the heat exchanger (≥0℃) and preventing the temperature of the high-temperature liquid in the heat exchange tubes from falling below 0℃, thereby improving the antifreeze capability of the heat exchange tubes.
[0041] In the event of an unexpected water pump shutdown but the fan continues to operate, the air to be heated continues to enter, but the liquid in the coil-flow circuit 5 of the antifreeze heat exchanger stops flowing and the liquid level drops. The advantage of this application, by installing a lower insulation baffle 4 below the air inlet side of the heat exchanger shell 1, is that, due to the action of the lower insulation baffle 4, the liquid deposited at the bottom of the coil-flow circuit 5 has reduced heat exchange with the sub-zero air, preventing the temperature of the lower heat exchange tubes in the coil-flow circuit 5 from immediately dropping to sub-zero temperatures. This provides maintenance personnel with sufficient time for repairs and improves the antifreeze capability of the heat exchange tubes.
[0042] The antifreeze heat exchanger provided in this application can reduce the temperature difference between the fluid inside and outside the tube, provide windproof insulation for the heat exchange tube below, improve the antifreeze capability of the heat exchange tube in case of emergencies, and ensure that the heat exchanger will not be frozen and cracked in severe cold environments.
[0043] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.
Claims
1. An antifreeze heat exchanger, characterized in that, The device includes a heat exchanger housing (1) and several coiled flow circuits (5) disposed therein. The inlet of the coiled flow circuit (5) is connected to an inlet manifold (2), and the outlet is connected to an outlet manifold (3). The inlet manifold (2) and the outlet manifold (3) are arranged on the side of the heat exchanger housing (1). The inlet manifold (2) is located in front of the outlet manifold (3). A lower heat insulation baffle (4) is provided below the air inlet side of the heat exchanger housing (1). The heat exchanger tube with the inlet is arranged in front of the heat exchanger tube with the outlet.
2. The antifreeze heat exchanger according to claim 1, characterized in that, A straight water inlet pipe is connected above the water inlet manifold (2), and the straight water inlet pipe is connected to the water inlet.
3. The antifreeze heat exchanger according to claim 2, characterized in that, The water inlet straight pipe is arranged vertically and forms an L-shape with the water inlet manifold (2).
4. The antifreeze heat exchanger according to claim 1, characterized in that, A straight water outlet pipe is connected above the water outlet collection pipe (3), and the straight water outlet pipe is connected to the water outlet.
5. The antifreeze heat exchanger according to claim 4, characterized in that, The straight outlet pipe is arranged vertically and forms an L-shape with the outlet collection pipe (3).
6. The antifreeze heat exchanger according to claim 1, characterized in that, The lower insulation baffle (4) is a square insulation board filled with insulation material.
7. The antifreeze heat exchanger according to claim 1, characterized in that, The height of the lower insulation baffle (4) is 60cm to 80cm.
8. The antifreeze heat exchanger according to claim 1, characterized in that, The lower insulation baffle (4) is connected to the heat exchanger shell (1) by bolts.
9. The antifreeze heat exchanger according to claim 1, characterized in that, The water inlet manifold (2) is located below the side of the heat exchanger shell (1).
10. The antifreeze heat exchanger according to claim 1, characterized in that, The outlet water collection pipe (3) is located above the side of the heat exchanger shell (1).