A back-passage variable-diameter tube boiler convection heat exchange device

Abstract

The utility model relates to a boiler heat exchange technical field especially relates to a one-way stroke reducing pipe boiler convection heat exchange device, and medium flows between the outer tube inner wall and the inner tube outer wall. Temperature detection device real -time monitoring the temperature of this area, when temperature rises, the air pipe is inflated to the inner tube inner chamber, makes the inner tube inner diameter increase. Due to the increase of the inner tube inner diameter, the gap between the inner and outer tube reduces, under the same flow, the medium flow rate increases. The increase of flow rate makes the heat exchange of medium and pipe wall more rapid and sufficient, thereby enhanced the heat exchange effect. When temperature reduces, the gas in the inner tube is sucked out by the bidirectional air pump, the inner tube inner diameter reduces, the gap between the inner and outer tube increases, and the medium flow rate reduces. The reduction of flow rate prolongs the contact time of medium and pipe wall, guarantees the heat exchange efficiency at low temperature. Through this according to temperature real -time and accurate adjustment pipe diameter mode, the heat exchange demand under different working conditions is satisfied. Can be widely used in the boiler heat exchange technical field.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler heat exchange technical field, concretely relates to a one-way stroke variable diameter pipe boiler convection heat exchange device. BACKGROUND

[0002] In the field of heat energy utilization, the efficient operation of heat exchange equipment plays a key role in the effective utilization of energy. As a common heat exchange method for boilers, the convective heat exchange of heat exchange pipes often uses variable pipe diameter design in practical application. This is because the change of pipe diameter can directly affect the flow rate of the medium in the pipe, thereby optimizing the heat exchange effect.

[0003] When the pipe diameter is small, the flow rate of the medium in the pipe will increase significantly, which increases the convective heat transfer coefficient and strengthens the heat transfer process. Therefore, small pipe diameter is suitable for high-temperature and high-heat-load conditions of the boiler, and can achieve rapid and efficient heat exchange.

[0004] On the contrary, when the pipe diameter is large, the flow rate of the medium is relatively slow, the convective heat transfer coefficient is reduced, and the heat transfer effect may be weakened. However, large pipe diameter can effectively reduce flow resistance and pressure loss and reduce energy consumption when the boiler temperature is low and the heat load is small.

[0005] However, in the actual operation of the boiler, its temperature is not constant, but fluctuates constantly with the frequent changes of working conditions and loads. However, at the present stage, the pipe diameter for medium flow is often difficult to change flexibly and timely with the change of boiler temperature. This leads to the fact that when the boiler temperature is high, if the pipe diameter is too small, it may not meet the demand of rapid heat exchange, thereby affecting the overall heat exchange efficiency; and when the boiler temperature is low, if the pipe diameter is too large, it may cause energy waste and unnecessary pressure loss. INVENTION CONTENTS

[0006] In view of the problem in the prior art that the pipe diameter of the heat exchange pipe for the heat exchange medium cannot change timely with the change of the boiler temperature, thereby affecting the overall heat exchange efficiency, the utility model provides a one-way stroke variable diameter pipe boiler convection heat exchange device.

[0007] In order to solve the above technical problem, the utility model solves the problem by the following technical scheme:

[0008] A one-way stroke variable diameter pipe boiler convection heat exchange device, comprising a heat exchange pipe, the heat exchange pipe comprising an outer pipe and an inner pipe, a temperature detection device being arranged between the inner pipe and the outer pipe, the inner pipe being fixed in the inner cavity of the outer pipe, the inner pipe comprising two mounting portions and a connecting portion arranged between the two mounting portions, the connecting portion being made of elastic material; further comprising a gas exchange pipe, one end of the gas exchange pipe penetrating through the side wall of the outer pipe and being connected with the inner cavity of the inner pipe.

[0009] In the operation of the boiler, the heat exchange pipe is arranged in the inner cavity of the boiler body, and the medium flows between the inner wall of the outer pipe and the outer wall of the inner pipe. The temperature detection device monitors the temperature of this area in real time. When the temperature rises, the bidirectional air pump inflates the inner cavity of the inner pipe through the air exchange pipe, so that the inner diameter of the inner pipe increases. Due to the increase of the inner diameter of the inner pipe, the gap between the inner and outer pipes decreases, and under the same flow, the flow rate of the medium increases. The increase of the flow rate makes the heat exchange between the medium and the pipe wall more rapid and sufficient, thereby enhancing the heat exchange effect.

[0010] On the contrary, when the temperature decreases, the bidirectional air pump sucks out the gas in the inner pipe, the inner diameter of the inner pipe decreases, the gap between the inner and outer pipes increases, and the flow rate of the medium decreases. The decrease of the flow rate prolongs the contact time of the medium with the pipe wall, ensuring the heat exchange efficiency at low temperature. Through this way of real-time and accurate adjustment of the pipe diameter according to the temperature, fine control of the heat exchange process is realized, meeting the heat exchange demand under different working conditions

[0011] As a preferred, the side wall of the mounting portion is provided with a mounting hole for the air exchange pipe to insert, and the other end of the mounting hole is connected with the inner cavity of the inner pipe.

[0012] The mounting hole provides a stable mounting position for the air exchange pipe, ensuring that the air exchange pipe can accurately and effectively communicate with the inner cavity of the inner pipe, realizing the smooth filling or extraction of gas, and thus accurately controlling the change of the inner diameter of the inner pipe.

[0013] As a preferred, the side wall of the mounting portion away from the connecting portion is fixed with a mounting rod, and the end of the mounting rod is fixed on the inner wall of the outer pipe.

[0014] The mounting rod provides reliable support and fixation for the inner pipe, ensuring the stability of the position of the inner pipe in the operation of the boiler, and ensuring the normal progress of the heat exchange process. At the same time, the inner pipe and the outer pipe maintain a certain distance and relative position, which is beneficial to the uniform flow of the medium between the inner wall of the outer pipe and the outer wall of the inner pipe, and improves the heat exchange efficiency.

[0015] As a preferred, a plurality of limiting rings arranged between the two mounting portions are fixed on the inner wall of the outer pipe, a fixing rod is fixed on the outer wall of the limiting ring, the other end of the fixing rod is fixed on the inner wall of the outer pipe, and the connecting portion passes through the limiting ring.

[0016] If the limiting ring is not arranged, the connecting portion will expand under the pressure of the internal gas, the middle part of the connecting portion will expand more obviously, and the two ends of the connecting portion will expand less, which is not conducive to the passage of the medium through the gap between the outer pipe and the inner pipe. The arrangement of the limiting ring ensures the uniformity of the deformation of the inner pipe connecting portion, so that the expansion of the connecting portion under the inflation effect is more uniform, avoiding the situation that the middle part expands obviously while the two ends expand less, so that the heat exchange medium can flow through the heat exchange pipe at a more stable flow rate, making the heat exchange effect more stable and reliable.

[0017] As preferred, the diameter of the inner wall of the limiting ring is the same as the diameter of the outer wall of the mounting part.

[0018] The smooth transition of the inner tube during deformation is ensured, the medium flow resistance and energy loss caused by sudden change of diameter are reduced, and the heat exchange efficiency is improved.

[0019] As preferred, the bidirectional air pump is further included, and one end of the air exchange pipe is connected with the bidirectional air pump.

[0020] The bidirectional air pump is connected with the inner tube through the air exchange pipe, and provides power support for the change of the inner tube diameter, so that the device can adjust the heat exchange performance in time according to actual needs.

[0021] As preferred, the water supplement tank is further included, and the water inlet pipe is connected with one end of the heat exchange pipe and inserted into the water supplement tank.

[0022] Water is used as the heat exchange medium, the water supplement tank is connected with the heat exchange pipe through the water inlet pipe, and the required water is continuously supplemented for the heat exchange system, so that the normal operation of the system is maintained. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the heat exchange device and the boiler in the embodiment;

[0024] Figure 2 It is a schematic diagram of the overall structure of the heat exchange pipe in the embodiment;

[0025] Figure 3 It is a schematic diagram of the structure of the inner tube and the limiting ring in the embodiment;

[0026] Figure 4 It is a schematic diagram of the structure of the limiting ring in the embodiment.

[0027] The names of the parts referred to by the respective numbers in the drawings are as follows:

[0028] 110, boiler body; 120, outer tube; 130, inner tube; 1301, mounting part; 1302, connecting part; 1303, mounting hole; 140, air exchange pipe; 150, mounting rod; 160, limiting ring; 1601, fixing rod; 170, bidirectional air pump; 180, water supplement tank; 1801, water inlet pipe. DETAILED DESCRIPTION

[0029] In order to further understand the content of the present application, the present application will be described in detail in combination with the drawings and embodiments. It should be understood that the embodiments are only used to explain the present application but not to limit the present application.

[0030] EMBODIMENT

[0031] As Figures 1-4As shown, the embodiment discloses a one-return stroke variable diameter pipe boiler convection heat exchange device. The heat exchange pipe is arranged in the boiler body 110, and both ends of the heat exchange pipe extend out of the boiler body 110. One end of the heat exchange pipe is connected with a water inlet pipe 1801, and the other end of the water inlet pipe 1801 is inserted into a water supplement tank 180. The water in the water supplement tank 180 is heated by the boiler body 110 and discharged from the other end of the heat exchange pipe.

[0032] The heat exchange pipe is composed of an outer pipe 120 and an inner pipe 130. The inner pipe 130 comprises two mounting portions 1301 and a connecting portion 1302 arranged between the two mounting portions 1301, and the connecting portion 1302 is made of a rubber material with good elasticity. A temperature detection device is arranged between the outer pipe 120 and the inner pipe 130.

[0033] In addition, there is also an air exchange pipe 140, and a bidirectional air pump 170 is also provided, which is fixed on the outer wall of the boiler body 110. One end of the air exchange pipe 140 is connected with the bidirectional air pump 170, and the other end penetrates through the side wall of the outer pipe 120 and is connected with the inner cavity of the inner pipe 130 through a mounting hole 1303 in the side wall of the mounting portion 1301. The side wall of the mounting portion 1301 away from the connecting portion 1302 is provided with a mounting rod 150, and the other end of the mounting rod 150 is fixed on the inner wall of the outer pipe 120, so that the inner pipe 130 is fixed in the outer pipe 120 through the mounting rod 150.

[0034] The embodiment is fixed with two limiting rings 160 at equal intervals between the two mounting portions 1301, and the outer wall of the limiting ring 160 is connected with the inner wall of the outer pipe 120 through a fixing rod 1601. The diameter of the inner wall of the limiting ring 160 is the same as that of the outer wall of the mounting portion 1301.

[0035] Principle of use and complete use process

[0036] When the boiler is running, the heat exchange pipe is arranged in the inner cavity of the boiler body 110, and the medium flows between the inner wall of the outer pipe 120 and the outer wall of the inner pipe 130. The temperature detection device monitors the temperature of this area in real time. The higher the flow rate of the medium, the faster the heat exchange speed of the medium, and the shorter the time required for the medium to heat to the specified temperature. According to the temperature data monitored by the temperature detection device, the flow rate of the medium is adjusted in real time to adapt to the temperature.

[0037] When the temperature rises to the set value, the bidirectional air pump 170 starts to work, and the bidirectional air pump 170 provides power for the diameter change of the inner pipe 130, and inflates the inner cavity of the inner pipe 130 through the air exchange pipe 140. Due to the elastic material property of the connecting portion 1302, the inner diameter of the inner pipe 130 increases, and the gap between the inner and outer pipes 120 decreases. Under the same flow rate, the flow rate of the medium increases, the heat exchange between the medium and the pipe wall is accelerated and more sufficient, and the heat exchange effect is significantly enhanced.

[0038] On the contrary, when the temperature decreases, the bidirectional air pump 170 sucks the gas in the inner tube 130 out, the inner tube 130 inner diameter decreases, the gap between the inner tube 130 and the outer tube 120 increases, the medium flow rate decreases, the contact time of the medium and the tube wall is prolonged, and the heat exchange efficiency at low temperature is ensured.

[0039] The mounting hole 1303 provides a stable mounting position for the air exchange tube 140, ensures that the gas can be accurately filled or extracted from the inner tube 130, and accurately controls the change of the inner tube 130 diameter. The mounting rod 150 makes the inner tube 130 position stable during the boiler operation, ensures the normal heat exchange process, and keeps the inner tube 130 and the outer tube 120 at a proper distance and relative position, which is beneficial to the uniform flow of the medium and improves the heat exchange efficiency.

[0040] The setting of the limiting ring 160 ensures the uniformity of the expansion of the connecting part 1302, makes the medium flow at a stable flow rate, and makes the heat exchange effect more stable and reliable. The inner wall of the limiting ring 160 and the outer wall of the mounting part 1301 have the same diameter, which reduces the medium flow resistance and energy loss, and further improves the heat exchange efficiency. The water supply tank 180 continuously supplies water to the heat exchange tube through the water inlet pipe 1801, and maintains the normal operation of the system.

[0041] In summary, the above is only a preferred embodiment of the present embodiment, and any changes and modifications made within the scope of the patent application of the present embodiment shall be within the scope of the present embodiment patent.

Claims

1. A back-passage variable-diameter tube boiler convection heat exchange device, comprising a heat exchange tube, characterized in that: The heat exchange pipe comprises an outer pipe (120) and an inner pipe (130), the temperature detecting device is arranged between the inner pipe (130) and the outer pipe (120), the inner pipe (130) is fixed in the inner cavity of the outer pipe (120), the inner pipe (130) comprises two mounting portions (1301) and a connecting portion (1302) arranged between the two mounting portions (1301), the connecting portion (1302) is made of elastic material; the heat exchange pipe further comprises a gas exchange pipe (140), one end of the gas exchange pipe (140) penetrates through the side wall of the outer pipe (120) and is connected with the inner cavity of the inner pipe (130).

2. A one-pass variable diameter tube boiler convection heat exchange device according to claim 1, characterized in that: The side wall of the mounting portion (1301) is provided with a mounting hole (1303) for inserting the gas exchange pipe (140), and the other end of the mounting hole (1303) is connected with the inner cavity of the inner pipe (130).

3. A one-pass variable diameter tube boiler convection heat exchange device according to claim 2, characterized in that: The side wall of the mounting portion (1301) away from the connecting portion (1302) is fixed with a mounting rod (150), and the end of the mounting rod (150) is fixed on the inner wall of the outer pipe (120).

4. A one-pass variable diameter tube boiler convection heat exchange device according to claim 1, characterized in that: A plurality of limiting rings (160) are fixed on the inner wall of the outer pipe (120) and arranged between the two mounting portions (1301), the outer wall of the limiting ring (160) is fixed with a fixing rod (1601), the other end of the fixing rod (1601) is fixed on the inner wall of the outer pipe (120), and the connecting portion (1302) penetrates through the limiting ring (160).

5. A one-pass variable diameter tube boiler convection heat exchange device according to claim 4, characterized in that: The diameter of the inner wall of the limiting ring (160) is the same as the diameter of the outer wall of the mounting portion (1301).

6. A one-pass variable diameter tube boiler convection heat exchange device according to claim 1, characterized in that: The heat exchange pipe further comprises a bidirectional air pump (170), one end of the gas exchange pipe (140) is connected with the bidirectional air pump (170).

7. A one-pass variable diameter tube boiler convection heat exchange device according to claim 1, characterized in that: The heat exchange pipe further comprises a water supplement tank (180), one end of the heat exchange pipe is connected with a water inlet pipe (1801), and one end of the water inlet pipe (1801) is inserted into the water supplement tank (180).

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