Ventilation structure of heat exchanger

Abstract

The ventilation structure comprises ventilation pipes, a collecting pipe, an internal heat exchanger and an external heat exchanger, the collecting pipe comprises a collecting inlet pipe and a collecting outlet pipe, the internal heat exchanger, the collecting outlet pipe, the external heat exchanger and the collecting inlet pipe are sequentially connected to form a circulation pipeline, and the ventilation pipes are arranged outside the collecting inlet pipe and the collecting outlet pipe respectively and form ventilation gaps. According to the heat exchanger, a heat exchange medium possibly leaked in the heat exchanger can be discharged into the external environment through the ventilation pipe, the heat exchanger is simple in structure, easy to set and low in cost, and the risk of explosion generated in a closed space due to leakage of the heat exchange medium can be avoided.

Description

Technical Field

[0001] The present application relates to a ventilation structure of a heat exchanger, which is used for safety and explosion prevention. Background Art

[0002] Heat exchangers are widely used in industrial and household refrigeration and heat exchange equipment. For example, household refrigerators or air conditioners use a reverse Carnot cycle to achieve refrigeration or heat exchange through a heat exchanger in a closed space, and the heat exchange medium exchanges heat with the environment in the closed space. In order to protect the ozone layer and reduce the impact of greenhouse gas effects, the use of environmentally friendly heat exchange media is currently the main trend in refrigeration and heat exchange equipment. As the main product of environmentally friendly heat exchange media, hydrocarbon organic matter is used in more and more occasions and in more and more quantities. However, hydrocarbon organic environmentally friendly heat exchange media are often flammable and explosive. Therefore, how to add a ventilation structure to the heat exchanger to reduce the concentration of hydrocarbon organic environmentally friendly heat exchange media in the closed space so that its concentration in the closed space cannot reach the lower limit of the explosion limit is the key to reducing the risk of explosion in the closed space due to leakage of the heat exchange medium. Utility Model Content

[0003] The present application provides a ventilation structure for a heat exchanger, which can discharge heat exchange medium that may leak in the heat exchanger into the external environment through a ventilation pipe. The structure is simple and easy to set up, and the cost is low, and the risk of explosion in a closed space due to leakage of heat exchange medium can be avoided.

[0004] According to the present application, a ventilation structure of a heat exchanger includes a ventilation pipe, a collecting pipe, an internal heat exchanger and an external heat exchanger, the collecting pipe includes an inlet collecting pipe and an outlet collecting pipe, the internal heat exchanger, the outlet collecting pipe, the external heat exchanger and the inlet collecting pipe are connected in sequence to form a circulation pipeline, and the ventilation pipes are respectively arranged outside the inlet collecting pipe and the outlet collecting pipe to form a ventilation gap.

[0005] Among them, the internal heat exchanger may include at least one heat exchange pipeline; the internal heat exchanger may have multiple parallel pipelines, and the two ends of the parallel pipelines can be connected to the collecting pipe and the collecting pipe respectively; the internal heat exchanger can be placed horizontally or vertically; it can also include an isolation layer, and the internal heat exchanger and the external heat exchanger can be isolated by the isolation layer, the ventilation pipe can be arranged inside or outside the isolation layer, the collecting pipe can be arranged at the upper part or lower part of the internal space of the ventilation pipe, the ventilation pipe can be arranged at an angle, the external open end of the ventilation pipe can be provided with an exhaust fan, and the inside of the ventilation pipe can be installed with a flow sensor.

[0006] The present application adds a ventilation structure to the leakage-prone parts of the heat exchanger, such as the welding parts on the heat exchanger, so that when the heat exchange medium in the heat exchanger leaks, the heat exchange medium can be discharged to the external environment in time to prevent accumulation in the closed space to reach the explosion limit, thereby preventing the risk of explosion during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram showing the ventilation structure of a heat exchanger.

[0008] Figure 2 A schematic diagram showing the arrangement relationship between headers and ventilation pipes.

[0009] Figure 3 A schematic diagram showing another arrangement relationship between the header and the ventilation pipe.

[0010] Figure 4 A schematic diagram showing one arrangement of ventilation ducts.

[0011] Figure 5 A schematic diagram showing an alternative arrangement of ventilation ducts. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0013] A ventilation structure of a heat exchanger according to the present application is suitable for the case where the heat exchange medium inside the heat exchanger is a flammable and explosive medium, for example, a hydrocarbon organic heat exchange medium. Figure 1 As shown, it includes a ventilation pipe 1, a header 2, an internal heat exchanger 3 and an external heat exchanger 4. The internal heat exchanger 3 can be formed by at least one pipeline, and the two ends of the internal heat exchanger 3 are respectively connected to the header 2, and the header includes an inlet pipe and an outlet pipe, preferably welded. The pipeline of the internal heat exchanger 3 can be connected in a manner of multiple parallel pipelines to reduce flow resistance and improve heat exchange efficiency. According to different uses, the internal heat exchanger 3 can be placed horizontally, such as used as a floor heating heat exchanger for heating in the room; the internal heat exchanger 3 can also be placed vertically, such as used as a heat exchanger for refrigerator cooling. Furthermore, the heat exchanger can also form a forced convection cycle through a fan motor to improve heat exchange efficiency. The header 2 is the main channel for the heat exchange medium to flow into and out of the internal heat exchanger 3, and distributes the heat exchange medium to at least one heat exchange pipeline of the internal heat exchanger through the header.

[0014] After the heat exchange medium flows in from the collecting pipe, it is distributed on the heat exchange pipeline of the internal heat exchanger, and then flows out from another collecting pipe to the external heat exchanger 4. After exchanging heat with the surrounding environment through the external heat exchanger 4, it flows back to the collecting pipe, thereby completing the flow cycle of the heat exchange medium. In order to avoid direct heat dissipation between the internal and external environments, it is necessary to form an isolation layer 5 between the internal heat exchanger 3 and the external heat exchanger 4. The isolation layer 5 forms a closed space, such as a refrigerator for storing food, or a building for people or objects. Driven by the compressor and controlled by the throttle valve, the heat exchange medium realizes heat exchange between the internal heat exchanger 3 and the external heat exchanger 4, forming a reverse Carnot cycle.

[0015] The risk point of heat exchange medium leakage is the welding position of the header and the internal heat exchanger. In order to avoid leakage of heat exchange medium, the present application arranges a ventilation pipe 1 outside the header 2 to create a ventilation gap between the ventilation pipe 1 and the header 2. The ventilation pipe 1 can be pre-buried in the isolation layer 5 or arranged outside the isolation layer 5, but the end of the ventilation pipe must remain unobstructed with the external environment so that the heat exchange medium can be discharged into the external environment when it leaks.

[0016] like Figure 2-3 As shown, if the density of the heat exchange medium is greater than that of air, the header 2 is preferably arranged at the upper part of the ventilation pipe 1; if the density of the heat exchange medium is less than that of air, the header 2 is preferably arranged at the lower part of the ventilation pipe 1, so that the heat exchange medium can be collected and discharged through the ventilation pipe in a larger space and prevented from leaking into the closed space through the connection between the ventilation pipe and the header. Figure 4-5 As shown, the arrangement of the ventilation pipe 1 can also be inclined according to the size of the heat exchange medium and the air density. When the heat exchange medium is denser than the air, the ventilation pipe 1 is inclined downward, that is, its open end A connected to the external environment is lower; when the heat exchange medium is less dense than the air, the ventilation pipe 1 is inclined upward, that is, its open end A connected to the external environment is higher. Preferably, an exhaust fan can also be installed at the open end A of the ventilation pipe 1 to discharge the heat exchange medium in the ventilation pipe into the environment as soon as possible to achieve mandatory explosion protection; a sensor can also be installed in the ventilation pipe 1 to sense the amount of leaked heat exchange medium, and the exhaust fan installed in the ventilation pipe 1 can be controlled to start and stop through the controller.

[0017] Although the implementation methods disclosed in this application are as above, the contents described are only implementation methods adopted for facilitating the understanding of this application, and are not intended to limit this application. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. A ventilation structure of a heat exchanger, characterized in that: It includes a ventilation pipe, a collecting pipe, an internal heat exchanger and an external heat exchanger. The collecting pipe includes an inlet pipe and an outlet pipe. The internal heat exchanger, the outlet pipe, the external heat exchanger and the inlet pipe are connected in sequence to form a circulation pipeline. The ventilation pipes are respectively arranged outside the inlet pipe and the outlet pipe to form a ventilation gap.

2. The ventilation structure according to claim 1, characterized in that: The internal heat exchanger includes at least one heat exchange pipeline.

3. The ventilation structure according to claim 2, characterized in that: The internal heat exchanger has a plurality of parallel pipelines, and both ends of the parallel pipelines are respectively connected to the inlet header and the outlet header.

4. The ventilation structure according to any one of claims 1 to 3, characterized in that: The internal heat exchanger is placed horizontally or vertically.

5. The ventilation structure according to claim 4, characterized in that: An isolation layer is also included, and the internal heat exchanger and the external heat exchanger are isolated from each other by the isolation layer.

6. The ventilation structure according to claim 5, characterized in that: The ventilation pipe is arranged inside or outside the isolation layer.

7. The ventilation structure according to any one of claims 1-3, 5-6, characterized in that: The header is arranged at the upper part or the lower part of the inner space of the ventilation pipe.

8. The ventilation structure according to any one of claims 1-3, 5-6, characterized in that: The ventilation pipe is arranged obliquely.

9. The ventilation structure according to any one of claims 1-3, 5-6, characterized in that: An exhaust fan is arranged at the external open end of the ventilation pipe.

10. The ventilation structure according to any one of claims 1-3, 5-6, characterized in that: A flow sensor is installed inside the ventilation pipe.

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