Gravity sealing device of rotary heat exchanger

Abstract

The utility model provides a gravity sealing device of a rotary heat exchanger, and belongs to the technical field of heat exchanger sealing. The device comprises a movable plate and a balancing weight, the movable plate is provided with a hinged end and a movable end; a hinge shaft is arranged at the hinge end, and the hinge end is rotatably mounted at the bottom of the radial partition plate through the hinge shaft; the balancing weight is mounted at the movable end; the balancing weight is located on the low-pressure side, and the gravity action of the balancing weight enables the movable end of the movable plate to fall down so that the movable end can make contact with the fixed plate. The movable end of the movable plate is pressed downwards through the balancing weight, so that sealing is formed between the movable end and the fixed plate; other mechanical structures are not needed, the work is reliable, the sealing performance is good, and the leakage rate is low.

Description

Technical Field

[0001] The utility model relates to a sealing device manufacturing technology, in particular to a rotary heat exchanger gravity sealing device, belonging to the heat exchanger sealing component manufacturing technical field. Background Art

[0002] A rotary heat exchanger is a device that exchanges heat through a continuously rotating rotor and a heat storage element, with a certain gap between the rotating rotor and the static sealing plate.

[0003] One of the most important performance indicators of a rotary heat exchanger is the leakage rate, and the key factor that determines the leakage rate is the sealing gap between the moving and static parts, namely the rotor and the sealing plate. When the rotary heat exchanger is in hot operation, each component will expand to varying degrees due to heat, and the gaps between the rotor and static sealing plates such as the top and bottom fan plates and the axial sealing plate will change, and these changes cannot be predicted or controlled. The larger the gap, the greater the leakage rate, the lower the boiler efficiency, the higher the fan power and coal consumption, and the more pollutants are emitted; on the contrary, the gap cannot be too tight, otherwise it will cause safety accidents such as heat exchanger rotor jamming, abnormal increase in drive motor current, and even shutdown. Therefore, the rotary heat exchanger sealing device has a very important impact on the economy, safety, and environmental protection indicators of the heat exchanger and even the entire power plant.

[0004] The most direct and effective means to reduce the leakage of rotary heat exchangers is to keep the sealing gap as small as possible while ensuring the safety of the unit. At present, the sealing types used at home and abroad mainly include adjustable sealing plates, fixed sealing plates, fixed sealing sheets, flexible (elastic) sealing sheets, hinged seals, etc. The adjustable sealing plates have complex structures, poor reliability, and high maintenance requirements; the sealing gap of the fixed sealing plate is calculated and set according to the maximum load of the boiler, and the sealing gap becomes larger and the leakage rate increases at low loads. It has poor adaptability to the boiler load and external environment, and has high requirements for processing, installation and commissioning. When the boiler is started and stopped, the heat exchanger is prone to jamming and other accidents due to rapid temperature changes; the existing flexible (elastic) sealing sheets and hinged seals have very limited gap adjustment compensation, and cannot achieve full contact with the sealing plate under all operating conditions, that is, to achieve the sealing effect of "near zero gap" and "near zero direct leakage", and are prone to failure in high temperature and high ash operating environments, with very high requirements for materials, poor durability and stability, short service life, and high maintenance requirements.

[0005] Therefore, the existing sealing devices of rotary heat exchangers in the prior art have certain limitations in terms of performance indicators, durability, reliability, adaptability, and operation and maintenance materials. At present, there is no ideal sealing device that is safe, reliable, long-term stable, and has a good sealing effect. Utility Model Content

[0006] The utility model provides a new gravity sealing device for a rotary heat exchanger, which realizes automatic downward pressing of a movable plate through the gravity action of a counterweight block, thereby realizing sealing of the movable plate, so as to solve the technical problem that the sealing device in the prior art cannot realize good sealing stably for a long time.

[0007] The rotary heat exchanger gravity sealing device of the utility model embodiment is used to isolate the high-pressure side from the low-pressure side and seal the gap between the radial partition and the fixed plate. The rotary heat exchanger gravity sealing device of the utility model embodiment comprises: a movable plate and a counterweight; the movable plate has a hinge end and a movable end; the hinge end is provided with a hinge shaft, which is rotatably mounted on the bottom of the radial partition through the hinge shaft; the counterweight is mounted on the movable end;

[0008] The counterweight block is located at the low-pressure side, and the gravity of the counterweight block causes the movable end of the movable plate to fall down so that the movable end contacts the fixed plate.

[0009] The gravity sealing device for the rotary heat exchanger as described above, wherein a return spring is arranged on the hinge shaft; one end of the return spring is fixed to the radial partition plate, and the other end abuts against the movable plate, and the movable end abuts against the fixed plate.

[0010] In the gravity sealing device for a rotary heat exchanger as described above, a contact plate is installed at the bottom of the movable plate, and an inclined contact surface is provided on the contact plate; the movable plate contacts the fixed plate through the inclined contact surface.

[0011] In the gravity sealing device for a rotary heat exchanger as described above, the counterweight block is installed on the upper surface of the movable plate and is close to the movable end.

[0012] The gravity sealing device for a rotary heat exchanger as described above, wherein the counterweight block is detachably mounted on the movable plate.

[0013] The gravity sealing device for a rotary heat exchanger as described above, wherein a base plate is mounted on the radial partition plate; and the hinge shaft is mounted on the base plate.

[0014] As described above, in the rotary heat exchanger gravity sealing device, a clamping plate is also provided on the base plate, and fastening bolts are provided on the clamping plate; the clamping plate is connected to the radial partition through the base plate, and the base plate is installed on the radial partition through the fastening bolts.

[0015] In the gravity sealing device for a rotary heat exchanger as described above, a wear-resistant layer is provided on the inclined contact surface, and the inclined contact surface contacts the fixed plate through the wear-resistant layer.

[0016] In the embodiment of the utility model, the movable end of the movable plate is pressed down by the counterweight block, so that a seal is formed between the movable end and the fixed plate; the utility model does not require other mechanical structures, and can seal the gap between the high-pressure side and the low-pressure side only by relying on gravity. It not only works reliably but also has good sealing performance and low leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a side structural diagram of a gravity sealing device for a rotary heat exchanger according to an embodiment of the utility model;

[0018] Figure 2 It is a side structural diagram of a rotary heat exchanger gravity sealing device in a high-pressure leakage state according to an embodiment of the utility model;

[0019] Figure 3 This is a side structural diagram of the rotary heat exchanger gravity sealing device in an uninstalled state according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The rotary heat exchanger gravity sealing device described in the utility model can be made of the following materials and components, but is not limited to the following materials and components, such as: springs, torsion springs, heat insulation plates, counterweights, hinged shafts, etc.

[0021] like Figure 1 The figure shows the side structure diagram of the gravity sealing device of the rotary heat exchanger of the utility model embodiment; Figure 2 and Figure 3 .

[0022] The gravity sealing device of the rotary heat exchanger of this embodiment is used to isolate the high-pressure side from the low-pressure side and seal the gap between the radial partition plate 1 and the fixed plate 2 to prevent the gas on the high-pressure side H from leaking to the low-pressure side L.

[0023] This embodiment includes: a movable plate 3 and a counterweight 4; the movable plate 3 has a hinged end and a movable end; the hinged end is provided with a hinge shaft 30, and is rotatably mounted on the bottom of the radial partition 1 through the hinge shaft 30; the counterweight 4 is mounted on the movable end; the counterweight 4 is generally detachably mounted on the movable plate 3. Its weight can be adjusted according to the maximum pressure difference between the high-pressure side H and the low-pressure side L.

[0024] Typically, the counterweight 4 is mounted on the upper surface of the movable plate 3 and is close to the movable end.

[0025] The counterweight block 4 is located at the low-pressure side L. The gravity of the counterweight block 4 causes the movable end of the movable plate 3 to fall down so that the movable end contacts the fixed plate 2 .

[0026] In the embodiment of the utility model, the movable end of the movable plate 3 is pressed down by the counterweight block 4, so that a seal is formed between the movable end and the fixed plate 2, thereby preventing gas leakage from the high-pressure side H to the low-pressure side L; the utility model does not require other mechanical structures, and can seal the gap between the high-pressure side and the low-pressure side only by gravity, which not only works reliably but also has good sealing performance and low leakage.

[0027] In special cases, once the gas pressure on the high-pressure side is too high, it overcomes the downward pressure formed by the movable plate 3 and the counterweight 4, causing the movable plate 3 to lift up, and the high-pressure gas can leak to the low-pressure side through the gap between the movable end of the movable plate 3 and the fixed plate 2, thereby reducing the gas pressure on the high-pressure side. During the above process, the discharge of high-pressure gas will not damage the entire sealing device, and it can automatically reset after the high-pressure gas leaks.

[0028] Furthermore, a return spring 31 is provided on the hinge shaft 30 ; the return spring 31 is generally a torsion spring. One end of the return spring 31 is fixed to the radial partition plate 1 , and the other end abuts against the movable plate 3 , and the movable end abuts against the fixed plate 2 .

[0029] The return spring 31 provides additional downward pressure on the movable plate 3, so that the movable end has a higher contact force with the fixed plate 2, thereby enhancing the sealing effect. Even if the return spring 31 fails, the downward pressure of the counterweight block can still be relied on to achieve sealing.

[0030] Generally, a contact plate 32 is installed at the bottom of the movable plate 3 , and an inclined contact surface is provided on the contact plate 32 ; the movable plate 3 contacts the fixed plate 2 through the inclined contact surface.

[0031] The inclined contact surface can increase the contact area with the fixing plate 2, thereby enhancing the sealing effect and avoiding leakage.

[0032] Preferably, the inclined contact surface is provided with a wear-resistant layer, through which the inclined contact surface contacts the fixing plate 2. The wear-resistant layer is generally made of tungsten carbide or ceramic coating.

[0033] In the gravity sealing device for a rotary heat exchanger of this embodiment, a base plate 10 is installed on the radial partition plate 1 ; and the hinge shaft 30 is installed on the base plate 10 .

[0034] Specifically, a clamping plate 11 is further provided on the base plate 10 , and a fastening bolt 12 is provided on the clamping plate 11 ; the clamping plate 11 is connected to the radial partition plate 1 through the base plate 10 , and the base plate 10 is installed on the radial partition plate 1 through the fastening bolts 12 .

[0035] During the actual installation process, the installation can be completed by simply fixing the base plate 10; the base plate 10 and the components such as the movable plate 3 thereon automatically fall down, such as Figure 3 As shown; after the fixing plate 2 below is installed, the sealing structure can be realized.

[0036] The advantages of the rotary heat exchanger gravity sealing device of the utility model embodiment are:

[0037] 1. The utility model has a simple structure, reliable operation and small leakage;

[0038] 2. The utility model has stable performance, basically has no control components, and can complete the sealing only by gravity;

[0039] 3. The utility model has strong adaptability, is easy to install, operate and maintain on site, and has little impact on the structure of the heat exchanger rotor and the static sealing plate.

[0040] In addition, the rotary heat exchanger gravity sealing device of the utility model has low manufacturing cost, compact structural design, reliable operation, stable performance, strong adaptability, easy installation and maintenance, and is suitable for gas sealing of various rotary radiators.

[0041] The serial numbers of the above-mentioned embodiments of the utility model are only for description and do not represent the advantages and disadvantages of the embodiments. Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of some deformations plus the necessary general technology superposition; of course, it can also be implemented by simplifying some important technical features. Based on this understanding, the technical solution of the utility model is essentially or the part that contributes to the prior art is: the overall structure and connection method, and the structure described in each embodiment of the utility model.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A gravity sealing device for a rotary heat exchanger, used to isolate the high pressure side from the low pressure side and seal the gap between the radial partition plate and the fixed plate, characterized in that: include: movable plate and counterweight; The movable plate has a hinged end and a movable end; the hinged end is provided with a hinge shaft, and is rotatably mounted on the bottom of the radial partition through the hinge shaft; the movable end is provided with the counterweight block; The counterweight block is located at the low-pressure side, and the gravity of the counterweight block causes the movable end of the movable plate to fall down so that the movable end contacts the fixed plate.

2. The gravity sealing device for a rotary heat exchanger according to claim 1, characterized in that: A return spring is arranged on the hinge shaft; one end of the return spring is fixed on the radial partition plate, and the other end abuts against the movable plate, and the movable end abuts against the fixed plate.

3. The gravity sealing device for a rotary heat exchanger according to claim 2, characterized in that: A contact plate is installed at the bottom of the movable plate, and an inclined contact surface is arranged on the contact plate; the movable plate contacts the fixed plate through the inclined contact surface.

4. The gravity sealing device for a rotary heat exchanger according to claim 3, characterized in that: The counterweight block is installed on the upper surface of the movable plate and is close to the movable end.

5. The gravity sealing device for a rotary heat exchanger according to any one of claims 1 to 4, characterized in that: The counterweight block is detachably mounted on the movable plate.

6. The gravity sealing device for a rotary heat exchanger according to any one of claims 1 to 4, characterized in that: A base plate is mounted on the radial partition plate; and the hinge shaft is mounted on the base plate.

7. The gravity sealing device for a rotary heat exchanger according to claim 6, characterized in that: A clamping plate is also provided on the base plate, and fastening bolts are provided on the clamping plate; the clamping plate is connected to the radial partition through the base plate, and the base plate is mounted on the radial partition through the fastening bolts.

8. The gravity sealing device for a rotary heat exchanger according to claim 3, characterized in that: The inclined contact surface is provided with a wear-resistant layer, and contacts the fixing plate through the wear-resistant layer.

Images