Sealing structure of rotary heat exchanger

Abstract

The utility model provides a rotary heat exchanger sealing structure, and belongs to the technical field of heat exchanger sealing. The device comprises a movable plate, a contact piece and a balancing weight, a hinge shaft is arranged in the middle of the movable plate, and the movable plate is rotationally installed on the radial partition plate through the hinge shaft. The contact piece and the balancing weight are located on the two sides of the hinge shaft respectively. The balancing weight is located on the high-voltage side so that the end, located on the high-voltage side, of the movable plate can fall down, and the contact piece can make contact with the fixed plate. According to the utility model, the movable plate is pressed down through the balancing weight, so that sealing is formed between the contact piece 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 sealing structure, belonging to the technical field of heat exchanger sealing component manufacturing. Background Art

[0002] A rotary heat exchanger is a device that performs heat exchange through a continuously rotating rotor and a heat storage element. There is a certain gap between the rotating rotor and the static sealing plate (sector plate and axial sealing plate, etc.).

[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 rotary heat exchanger sealing structure, which presses down one end of a movable plate by gravity, so as to form a seal between the other end of the movable plate and a fixed plate, so as to solve the technical problem that the sealing device in the prior art cannot achieve good sealing stably for a long time.

[0007] The rotary heat exchanger sealing structure 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 sealing structure of the utility model embodiment comprises: a movable plate, a contact piece and a counterweight block; a hinge shaft is provided in the middle of the movable plate, and the movable plate is rotatably mounted on the radial partition through the hinge shaft; the contact piece and the counterweight block are respectively located on both sides of the hinge shaft;

[0008] The counterweight block is located on the high-pressure side, so that the end of the movable plate located on the high-pressure side falls down and the contact piece contacts the fixed plate.

[0009] In the rotary heat exchanger sealing structure as described above, 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 makes the contact piece of the movable plate abut against the fixed plate.

[0010] As described above, in the rotary heat exchanger sealing structure, there is a pressure difference between the high-pressure side and the low-pressure side, and the deflection force of the pressure difference on the movable plate is F; the deflection force of the counterweight block on the movable plate is G, then G≥F, and the two are in opposite directions.

[0011] The rotary heat exchanger sealing structure as described above, wherein there is a maximum pressure difference and a minimum pressure difference between the high-pressure side and the low-pressure side, the deflection force of the maximum pressure difference on the movable plate is F1, and the deflection force of the minimum pressure difference on the movable plate is F2;

[0012] The deflection force of the return spring on the movable plate is F3, then F2 <F3+G≤0.8F1。

[0013] In the rotary heat exchanger sealing structure as described above, when the counterweight block is not installed, the center of gravity of the movable plate is located on the vertical plane where the hinge shaft is located.

[0014] The rotary heat exchanger sealing structure as described above, wherein the radial partition is in contact with the fixed plate through the contact piece on the movable plate to isolate the high-pressure side and the low-pressure side; a limit baffle is also provided on the movable plate; one side of the contact plate of the movable plate falls down to allow the limit baffle to abut against the radial partition.

[0015] In the rotary heat exchanger sealing structure as described above, the counterweight block is detachably mounted on the movable plate.

[0016] The rotary heat exchanger sealing structure as described above, wherein a base plate is mounted on the radial partition plate; and the hinge shaft is mounted on the base plate.

[0017] As described above, the rotary heat exchanger sealing structure, wherein 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.

[0018] In the rotary heat exchanger sealing structure as described above, the contact piece is a bent structure; a wear-resistant layer is provided on the contact piece, and the contact piece contacts the fixed plate through the wear-resistant layer.

[0019] In the embodiment of the utility model, the movable plate is pressed down by the counterweight block and the other end of the movable end is lifted, so that a seal is formed between the contact piece 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

[0020] Figure 1 It is a side structural diagram of the sealing structure of the rotary heat exchanger according to the embodiment of the utility model;

[0021] Figure 2 It is a side structural diagram of the rotary heat exchanger sealing structure in a high-pressure leakage state according to an embodiment of the utility model;

[0022] Figure 3 This is a side structural diagram of the rotary heat exchanger sealing structure in an uninstalled state according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The rotary heat exchanger sealing structure described in the present invention 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.

[0024] like Figure 1 The figure shows the side structure diagram of the rotary heat exchanger sealing structure of the utility model embodiment; Figure 2 and Figure 3 .

[0025] The rotary heat exchanger sealing structure of this embodiment is used to isolate the high-pressure side from the low-pressure side and seal the gap between the radial partition 1 and the fixed plate 2; this embodiment includes: a movable plate 3, a contact piece 32 and a counterweight 4; a hinge shaft 30 is provided in the middle of the movable plate 3, and the movable plate 3 can be rotatably mounted on the radial partition 1 through the hinge shaft 30; the contact piece 32 and the counterweight 4 are respectively located on both sides of the hinge shaft 30; the movable plate 3 is located on the top of the radial partition 1.

[0026] The counterweight block 4 is located on the high-pressure side, so that the end of the movable plate 3 located on the high-pressure side falls down and the contact piece 32 contacts the fixed plate 2 .

[0027] Typically, the counterweight 4 is mounted on the surface of the movable plate 3 and is located on a side away from the contact member 32. Typically, the counterweight 4 is detachably mounted on the movable plate 2. In the actual manufacturing process, the counterweight 4 can be integrated into the movable plate 3, and it is sufficient to meet the requirement that the gravity on one side is larger and the movable plate 3 can be automatically deflected.

[0028] In the embodiment of the utility model, the movable plate is pressed down by the counterweight block and the other end of the movable end is lifted, so that a seal is formed between the contact piece and the fixed plate; thereby, gas leakage from the high-pressure side H to the low-pressure side L is avoided; the utility model does not require other mechanical structures, and the gap between the high-pressure side and the low-pressure side can be sealed only by gravity, which not only works reliably but also has good sealing performance and low leakage.

[0029] In special cases, such as Figure 2 As shown; once the gas pressure on the high-pressure side is too high, the downward pressure formed by the movable plate 3 and the counterweight block 4 on the high-pressure side due to gravity is overcome, so that one end of the high-pressure side H of the movable plate 3 is lifted, and the high-pressure gas can leak to the low-pressure side through the gap between the contact piece 32 of the movable plate 3 and the fixed plate 2, thereby reducing the gas pressure on the high-pressure side. In the above whole 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. The counterweight block 4 is generally detachably installed on the movable plate 3. Its weight is adjusted according to the pressure difference between the high-pressure side H and the low-pressure side L in the working state.

[0030] In the rotary heat exchanger sealing structure of this embodiment, a return spring 31 is arranged 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 makes the contact member 32 of the movable plate 3 abut against the fixed plate 2.

[0031] The return spring 31 provides an additional restoring force to the movable plate 3, so that there is a higher contact force between the contact member 32 and the fixed plate 2, thereby enhancing the sealing effect. Even if the return spring 31 fails, the sealing can still be achieved by relying on the downward pressure of the counterweight.

[0032] For the rotary heat exchanger sealing structure of this embodiment, there is a pressure difference between the high-pressure side H and the low-pressure side L, and the deflecting force of this pressure difference on the movable plate is F; the gravitational force of the counterweight 4 on the deflecting force of the movable plate 3 is G, then G≥F, and the acting directions of the two are opposite. Thus, the contact member 32 can achieve the sealing effect with a lower contact force.

[0033] During the actual working process, there is a maximum pressure difference and a minimum pressure difference between the high-pressure side H and the low-pressure side L. The deflecting force of the maximum pressure difference on the movable plate is F1, and the deflecting force of the minimum pressure difference on the movable plate is F2; during the actual working process, the pressure on the high-pressure side is constantly changing, and usually the F1 formed by the maximum pressure difference accounts for a small proportion during the entire working state.

[0034] The deflecting force of the return spring 31 on the movable plate 3 is F3, then usually F2 < F3 + G ≤ 0.8F1. However, during the actual working process, due to the large change in the pressure on the high-pressure side, although the maximum pressure difference is rarely triggered, the pressure at the time of its triggering is four or five times the normal pressure. Therefore, during normal use, F2 < F3 + G ≤ 0.25 - 0.3F1, and the best is F2 < F3 + G ≤ 0.28F1.

[0035] In this way, during its entire working process, the best sealing effect can be ensured with a small contact force; once the gas pressure on the high-pressure side is too high, the movable plate can also automatically deflect, so that the high-pressure gas leaks to the low-pressure side to achieve the rebalance of the gas pressure; then the movable plate automatically resets to continue to achieve the automatic sealing with a low contact force.

[0036] For the rotary heat exchanger sealing structure of this embodiment, when the counterweight 4 is not installed on the movable plate 3, its center of gravity is located on the vertical plane where the hinge shaft 30 is located. In this way, during the actual installation process, for the sealing structures with different pressure differences, only the weight of the counterweight 4 needs to be adjusted to change the sealing effect.

[0037] For the rotary heat exchanger sealing structure of this embodiment, the radial partition 1 is in contact with the fixed plate 2 through the contact member 32 on the movable plate 3 to isolate the high-pressure side H and the low-pressure side L; a limit baffle 35 is also provided on the movable plate 3; when one side of the contact plate 32 of the movable plate 3 drops, the limit baffle 35 abuts against the radial partition 1. The limit baffle 35 can limit the maximum deflection angle of the movable plate 3 to avoid impact on the movable plate during the leakage of the high-pressure side.

[0038] In the rotary heat exchanger sealing structure 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 .

[0039] 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 .

[0040] During the actual installation process, the installation can be completed by simply installing and fixing the base plate 10; the base plate 10 and other components on it are automatically lifted up, such as Figure 3 As shown; after the upper fixing plate 2 is installed, the normal operation of the sealing structure can be achieved.

[0041] Generally, the contact member 32 is a bent structure; a wear-resistant layer is provided on the contact member 32, and the contact member 32 contacts the fixing plate 2 through the wear-resistant layer. The wear-resistant layer is generally a tungsten carbide material or a ceramic coating.

[0042] The contact member 32 is an elastic metal sheet with a bent structure. When in contact with the fixed plate 2, the elastic metal sheet can be deformed by the torque generated by the counterweight, thereby increasing the contact area with the fixed plate 2 and improving the sealing effect. It should be noted that since the pressure against the fixed plate 2 does not change at this time and the contact area increases, the friction and contact stress between the two will not increase. This improvement in sealing effect is not easy to sacrifice maintainability.

[0043] The advantages of the rotary heat exchanger sealing structure of the utility model embodiment are:

[0044] 1. The utility model has a simple structure, reliable operation and small leakage;

[0045] 2. The utility model has stable performance, basically has no control components, and can complete the sealing only by gravity;

[0046] 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.

[0047] In addition, the rotary heat exchanger sealing structure of the utility model has low manufacturing cost, compact structural design, reliable operation, stable performance, strong adaptability, convenient installation and maintenance, and is suitable for gas sealing of various rotary radiators.

[0048] 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.

[0049] 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 rotary heat exchanger sealing structure, 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: A movable plate, a contact piece and a counterweight; a hinge shaft is arranged in the middle of the movable plate, and the movable plate is rotatably mounted on the radial partition through the hinge shaft; the contact piece and the counterweight are respectively located on both sides of the hinge shaft; The counterweight block is located on the high-pressure side, so that the end of the movable plate located on the high-pressure side falls down and the contact piece contacts the fixed plate.

2. The rotary heat exchanger sealing structure 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 of the return spring abuts against the movable plate and makes the contact piece of the movable plate abut against the fixed plate.

3. The rotary heat exchanger sealing structure according to claim 2, characterized in that: There is a pressure difference between the high-pressure side and the low-pressure side, and the deflection force of the pressure difference on the movable plate is F; the deflection force of the counterweight on the movable plate is G, then G≥F, and the two are in opposite directions.

4. The rotary heat exchanger sealing structure according to claim 3, characterized in that: There is a maximum pressure difference and a minimum pressure difference between the high-pressure side and the low-pressure side, the deflection force of the maximum pressure difference on the movable plate is F1, and the deflection force of the minimum pressure difference on the movable plate is F2; The deflection force of the return spring on the movable plate is F3, then F2 <F3+G≤0.8F1。 5. The rotary heat exchanger sealing structure according to claim 4, characterized in that: When the counterweight block is not installed, the center of gravity of the movable plate is located on the vertical plane where the hinge shaft is located.

6. The rotary heat exchanger sealing structure according to any one of claims 2 to 5, characterized in that: The radial partition is in contact with the fixed plate through the contact piece on the movable plate to isolate the high-pressure side from the low-pressure side; a limit baffle is also provided on the movable plate; one side of the contact plate of the movable plate falls down to make the limit baffle abut against the radial partition.

7. The rotary heat exchanger sealing structure according to any one of claims 1 to 3, characterized in that: The counterweight block is detachably mounted on the movable plate.

8. The rotary heat exchanger sealing structure according to any one of claims 1 to 3, characterized in that: A base plate is mounted on the radial partition plate; and the hinge shaft is mounted on the base plate.

9. The rotary heat exchanger sealing structure according to claim 8, 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.

10. The rotary heat exchanger sealing structure according to any one of claims 1 to 3, characterized in that: The contact piece is a bent structure; a wear-resistant layer is provided on the contact piece, and the contact piece contacts the fixing plate through the wear-resistant layer.

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