CN212806647U

CN212806647U - Anti-displacement silicon carbide double-tube plate heat exchanger

Info

Publication number: CN212806647U
Application number: CN202021437561.5U
Authority: CN
Inventors: 蒋中宾; 王威
Original assignee: Chongqing Yeguan Machinery Manufacturing Co ltd
Current assignee: Chongqing Yeguan Machinery Manufacturing Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2021-03-26
Anticipated expiration: 2030-07-20

Abstract

The utility model provides an anti-displacement silicon carbide double-tube plate heat exchanger, belonging to the field of heat exchanger equipment, comprising a heat exchange shell and a heat exchange tube, wherein an outer tube plate and an inner tube plate are fixed between a seal head and a material port, and the inner tube plate is arranged between the outer tube plate and the material port; the outer pipe plate and the inner pipe plate are both provided with pipe holes matched with the heat exchange pipes, and the end sockets are provided with connectors communicated with the heat exchange pipes; the two ends of the heat exchange tube are respectively positioned in the two outer tube plates, an expansion cavity for accommodating the displacement of the end part of the heat exchange tube is arranged on the outer tube plate, the opposite surfaces of the inner tube plate and the outer tube plate are mutually attached, a first sealing ring group, a first retaining ring and a first locking nut are sequentially sleeved on the part of the inner tube plate of the heat exchange tube, the end part of the first locking nut is in contact fit with the outer tube plate, and the two ends of the first sealing ring group are respectively in contact fit with the first retaining ring and the inner wall. The utility model provides an among the prior art silicon carbide heat exchanger's lock nut axial displacement lead to the problem of sealed inefficacy.

Description

Anti-displacement silicon carbide double-tube plate heat exchanger

Technical Field

The utility model relates to a indirect heating equipment technical field especially relates to a carborundum double tube sheet heat exchanger.

Background

The heat exchanger is a process device for heat transfer, and the heat exchanger industry relates to nearly 30 industries such as heating ventilation, pressure vessels, water treatment equipment, pharmacy, chemical industry and petroleum, and forms an industrial chain mutually. Under the corrosion condition, the silicon carbide heat exchanger gradually replaces the traditional graphite and glass-lined heat exchanger. However, corrosion of silicon carbide heat exchangers is becoming a non-negligible problem. The sealing performance of the common single-tube plate silicon carbide heat exchanger is poor, and when tube pass leakage occurs, serious corrosion can be caused to equipment, and even production accidents occur. The pipe hole sealing of the double-tube plate heat exchanger generally adopts stuffing box type sealing and V-shaped sealing, and a locking nut is sealed by a sealing ring. The stuffing box sealing mode is adopted, when leakage occurs, the pipe cannot be disassembled, only the methods of pipe blocking and the like can be adopted, and the maintenance is inconvenient; the V-shaped sealing effect is good, but the installation is inconvenient; locking nuts, sealing rings and check rings are mostly adopted for sealing.

Although the sealing effect is good when the locking nut, the sealing ring and the check ring are combined, when thermal expansion occurs, the heat exchange tube is long, and the heat exchange tube can generate large axial displacement to drive the locking nut to slide out, so that sealing failure is caused.

At present, the leakage failure of the silicon carbide heat exchanger generally occurs at the joint of the tube plates, and the leakage failure can not be found in time, so that greater loss is easily caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the not enough in the above-mentioned background art, provide a prevent displacement carborundum double tube sheet heat exchanger to the lock nut axial displacement who solves among the prior art carborundum heat exchanger leads to the problem of sealed inefficacy.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a prevent displacement carborundum double tube sheet heat exchanger, it includes: the heat exchanger comprises a heat exchange shell and a heat exchange tube, wherein two material ports are formed in the heat exchange shell, end sockets are fixedly arranged on the material ports, an outer tube plate and an inner tube plate are fixedly arranged between the end sockets and the material ports, and the inner tube plate is arranged between the outer tube plate and the material ports; the outer pipe plate and the inner pipe plate are both provided with pipe holes matched with the heat exchange pipes, and the end sockets are provided with connectors communicated with the heat exchange pipes; the two ends of the heat exchange tube are respectively positioned in the two outer tube plates, an expansion cavity for accommodating the displacement of the end part of the heat exchange tube is formed in the outer tube plate, the opposite surfaces of the inner tube plate and the outer tube plate are mutually attached, a first sealing ring group, a first retaining ring and a first locking nut are sequentially sleeved outside the part of the inner tube plate of the heat exchange tube, the end part of the first locking nut is in contact fit with the outer tube plate, and the two ends of the first sealing ring group are respectively in contact fit with the first retaining ring and the inner wall of the inner tube plate.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model provides a prevent displacement carborundum double tube sheet heat exchanger adopts double tube sheet seal structure, and the outer tube sheet causes strict restriction to it in compressing tightly first nut inner tube sheet, even if the heat exchange tube is heated when taking place axial displacement, can not drive first lock nut roll-off yet. The outer tube plate is provided with an expansion cavity for accommodating displacement of the heat exchange tube after being heated and expanded, so that the heat exchange tube can be prevented from being damaged or ejecting out due to axial expansion. The whole body can not cause sealing failure due to axial movement of the heat exchange tube.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged view of a point a in fig. 1.

The heat exchange device comprises a heat exchange shell 1, a heat exchange tube 2, a seal head 3, an inner tube plate 4, an outer tube plate 5, a fixing flange 6, a connecting flange 7, a connecting port 8, a baffle plate 9, a first locking nut 41, a disc spring 42, a first retainer ring 43, a first seal ring group 44, an expansion cavity 51, a second locking nut 52, a second retainer ring 53 and a second seal ring group 54.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in fig. 1-2, the utility model provides a displacement-preventing silicon carbide double-tube plate heat exchanger, which comprises a heat exchange shell 1 and a heat exchange tube 2, wherein two material openings are arranged on the heat exchange shell 1, a sealing head 3 is fixedly arranged on each material opening, an outer tube plate 5 and an inner tube plate 4 are fixedly arranged between the sealing head 3 and the material openings, and the inner tube plate 4 is arranged between the outer tube plate 5 and the material openings; the outer pipe plate 5 and the inner pipe plate 4 are both provided with pipe holes matched with the heat exchange pipes 2, and the end sockets 3 are provided with connecting ports 8 communicated with the heat exchange pipes 2; the two ends of the heat exchange tube 2 are respectively positioned in the two outer tube plates 5, an expansion cavity 51 for accommodating the end displacement of the heat exchange tube 2 is formed in each outer tube plate 5, the opposite surfaces of the inner tube plate 4 and the outer tube plate 5 are mutually attached, the part of the inner tube plate 4 of the heat exchange tube 2 is sequentially sleeved with a first sealing ring group 44, a first check ring 43 and a first locking nut 41, the end part of the first locking nut 41 is not in contact fit with the outer tube plate 5, and the two ends of the first sealing ring group 44 are respectively in contact fit with the inner walls of the first check ring 43 and the inner tube plate 4.

According to the above technical scheme, the utility model discloses a theory of operation does: the structures of the first sealing ring group 44 and the like are limited by the first locking nut 41, and because the axial force borne by the axial expansion of the heat exchange tube 2 is transmitted to the first locking nut 41 and the heat exchange tube 2 directly drives the first locking nut 41, the first locking nut 41 easily slides out; the first locking nut 41 is axially limited through the outer pipe plate 5, the locking nut can be prevented from sliding out, the outer pipe plate 5 is provided with an expansion cavity 51 for accommodating the expansion displacement of the heat exchange pipe 2, excessive axial force cannot be applied, and the first locking nut is conventionally sealed.

Preferably, the outer tube plate 5 is provided with a second sealing ring group 54, a second retaining ring 53 and a second locking nut 52, the end portion of the heat exchange tube 2 is located in the second retaining ring 53, one end of the second retaining ring 53 is in contact fit with the second sealing ring group 54, the other end of the second retaining ring is in contact fit with the second locking nut 52, the second sealing ring group 54 is sleeved outside the heat exchange tube 2, and the second locking nut 52 is in threaded connection with the outer tube plate 5. The sealing structure on the outer tube plate 5 is similar to that on the inner tube plate 4, except that the heat exchange tube 2 does not completely penetrate through the outer tube plate 5, but in the second retaining ring 53, the remaining axial distance in the second retaining ring 53 forms an expansion cavity 51 which can axially deform, and the second locking nut 52 is not directly driven by the expansion of the heat exchange tube 2, so that the heat exchange tube 2 is not easy to slide out. Set up interior tube sheet 4, outer tube sheet 5, when making things convenient for the installation of sealing member, separately seal respectively the material in 1 and the head 3 of heat transfer casing, even if one of them party takes place to leak, can not cause the material to mix yet and cause great loss.

Preferably, the inner tube plate 4 is made of metal, and the outer tube plate 5 is made of polytetrafluoroethylene. The outer pipe plate 5 is directly contacted with materials in the heat exchange pipe 2, organic materials such as polytetrafluoroethylene have better corrosion resistance, and the inner surface of the seal head 3 is also provided with anticorrosive materials such as polytetrafluoroethylene, so that the corrosion resistance of the seal head 3 is improved. The thermal expansion coefficient of the polytetrafluoroethylene is about 10 times that of common metal materials such as carbon steel, stainless steel and the like, and the inner tube plate 4 in direct contact with materials in the heat exchange shell 1 needs to be close to the thermal expansion coefficient of the heat exchange tube 2, so that insufficient radial sealing caused by over expansion of the inner tube plate 4 is prevented.

Preferably, a leakage groove is arranged outside the inner tube plate 4, and the leakage groove is communicated with the joint of the inner tube plate 4 and the outer tube plate 5. When the material leaks, the material generally flows out from between two tube plates (the leakage condition at the connecting port 8 of the end socket 3 is less, and the large harm of material mixing is not generated), and the leakage groove guides and collects the material, so that the leakage groove is easy to find. In general, the simultaneous failure of the sealing of the outer tube sheet 5 and the inner tube sheet 4 does not occur, and the maintenance can be performed in a timely manner.

Preferably, the two material ports of the heat exchange shell 1 are coaxially arranged, wherein one material port is a material inlet, and the other material port is a material outlet. The coaxial arrangement is beneficial to horizontal placement and convenient for connection. During specific installation, a fixing flange 6 is arranged on the material opening, a connecting flange 7 is arranged on the seal head 3, and bolts for connection sequentially penetrate through the fixing flange 6, the inner pipe plate 4, the outer pipe plate 5 and the connecting flange 7. Through the bolt and the flange matching fixation, the temperature change at the flange is relatively low, and the looseness caused by thermal expansion and cooling can not be caused.

Preferably, a disc spring 42 is arranged between the first sealing ring set 44 and the first retainer ring 43, and the end of the second sealing ring set 54 facing the inner tube plate 4 is also provided with the disc spring 42. The axial pressing force on the two sealing ring sets can be ensured at any time. When the heat exchange pipe 2 is cooled and retracted, the sealing performance is prevented from being reduced because the first lock nut 41 is compressed to a reduced degree. The disc spring 42 is separated from the liquid for heat exchange by two sealing ring sets, so that the disc spring 42 can be prevented from being corroded.

Preferably, a plurality of baffle plates 9 are arranged in the heat exchange shell 1, and a plurality of through holes matched with the heat exchange tube 2 are arranged on the heat exchange tube 2. The baffle plate 9 is provided with a plurality of holes for the heat exchange tubes 2 to pass through, so that the effect of enhancing heat exchange by turbulent flow is achieved on one hand, and the effect of supporting the heat exchange tubes 2 is achieved on the other hand.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The anti-displacement silicon carbide double-tube plate heat exchanger is characterized by comprising a heat exchange shell and a heat exchange tube, wherein two material ports are formed in the heat exchange shell, end sockets are fixedly arranged on the material ports, an outer tube plate and an inner tube plate are fixedly arranged between the end sockets and the material ports, and the inner tube plate is arranged between the outer tube plate and the material ports; the outer pipe plate and the inner pipe plate are both provided with pipe holes matched with the heat exchange pipes, and the end sockets are provided with connectors communicated with the heat exchange pipes; the two ends of the heat exchange tube are respectively positioned in the two outer tube plates, an expansion cavity for accommodating the displacement of the end part of the heat exchange tube is formed in the outer tube plate, the opposite surfaces of the inner tube plate and the outer tube plate are mutually attached, a first sealing ring group, a first retaining ring and a first locking nut are sequentially sleeved on the part of the inner tube plate of the heat exchange tube, the end part of the first locking nut is in contact fit with the outer tube plate, and the two ends of the first sealing ring group are respectively in contact fit with the first retaining ring and the inner wall of the inner tube plate.

2. The anti-displacement silicon carbide double-tube plate heat exchanger as claimed in claim 1, wherein a second sealing ring set, a second retaining ring and a second locking nut are arranged on the outer tube plate, the end of the heat exchange tube is located in the second retaining ring, one end of the second retaining ring is in contact fit with the second sealing ring set, the other end of the second retaining ring is in contact fit with the second locking nut, the second sealing ring set is sleeved outside the heat exchange tube, and the second locking nut is in threaded connection with the outer tube plate.

3. The anti-displacement silicon carbide double tube sheet heat exchanger as claimed in claim 2, wherein the inner tube sheet is made of metal and the outer tube sheet is made of teflon.

4. The anti-displacement silicon carbide double tube plate heat exchanger as claimed in claim 1, wherein a leakage groove is formed outside the inner tube plate, and the leakage groove is communicated with a joint of the inner tube plate and the outer tube plate.

5. The anti-displacement silicon carbide double tube sheet heat exchanger of claim 1, wherein the inner surface of the end socket is provided with an anti-corrosion material.

6. The anti-displacement silicon carbide double-tube plate heat exchanger as claimed in any one of claims 1 to 5, wherein two material ports of the heat exchange shell are coaxially arranged, one of the material ports is a material inlet, and the other material port is a material outlet.

7. The anti-displacement silicon carbide double-tube plate heat exchanger as claimed in claim 6, wherein the end socket and the material port are connected by a bolt, the material port is provided with a fixing flange, the end socket is provided with a connecting flange, and the bolt passes through the fixing flange, the inner tube plate, the outer tube plate and the connecting flange in sequence.

8. The anti-displacement silicon carbide double tube plate heat exchanger as claimed in claim 2, wherein a disc spring is arranged between the first sealing ring set and the first retainer ring, and a disc spring is also arranged at one end of the second sealing ring set facing the inner tube plate.

9. The anti-displacement silicon carbide double tube plate heat exchanger as claimed in claim 8, wherein a plurality of baffles are arranged in the heat exchange shell, and a plurality of through holes matched with the heat exchange tubes are arranged on the heat exchange tubes.