Tubular heat exchanger

Abstract

The invention relates to the technical field of steam heat exchangers, in particular to a tubular heat exchanger which comprises a steam heat exchanger shell, two tube plates and a plurality of heat exchange pipelines, one side of the steam heat exchanger shell is defined as an end A, the other side of the steam heat exchanger shell is defined as an end B, and the two tube plates are symmetrically fixed in the steam heat exchanger shell. The two tube plates are jointly provided with a plurality of tube rows annularly distributed around the axis of the steam heat exchanger shell, each tube row is formed by distributing a plurality of heat exchange pipelines in the radial direction of the steam heat exchanger shell, a shaft rod penetrating through the two tube plates is rotationally installed in the steam heat exchanger shell, and the two sides of the shaft rod are sleeved with movable discs respectively. The pipe columns on the two pipe plates are composed of the straight heat exchange pipelines distributed in the radial direction of the shell of the steam heat exchanger, the communicating flow guide system on the movable disc can be accurately aligned with the pipe columns through rotation of the shaft rod, the problem that traditional equipment is only suitable for U-shaped pipelines is solved, the self-cleaning device is effectively matched with the straight heat exchange pipelines, the self-cleaning effect is good, and the service life of the steam heat exchanger is prolonged. The functions are more comprehensive.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam heat exchangers, in particular to a shell-and-tube heat exchanger. BACKGROUND

[0002] The shell-and-tube heat exchanger for steam systems is a heat exchange device composed of a shell, a tube bundle, a tube sheet, etc. Its working principle is to make steam flow in the shell side or the tube side, and exchange heat with the heated fluid on the other side through the tube wall. The steam condenses and releases latent heat, and the heated fluid absorbs heat and warms up. Due to its compact structure, high heat transfer efficiency, and ability to adapt to the pressure and temperature range of steam, it is widely used in large-scale heat transfer scenarios in steam systems, such as heating and industrial heating.

[0003] The inner diameter of the tube bundle in the shell-and-tube heat exchanger for steam systems is usually small, and long-term use of accumulated dirt can easily cause blockage, so it needs to be cleaned regularly. Referring to the granted patent for invention with publication number CN119245013B, a heat exchanger device for steam systems is disclosed. The heat exchanger device can clean several pipes individually by setting alignment components and protection components inside the tube box, making the internal flushing of the pipes more uniform and cleaner, and not causing secondary pollution to other pipes. By connecting the alignment components to the communication components, rotating mechanisms, and moving mechanisms, the wear between the alignment components and the mounting plate can be reduced when the alignment components change the cleaning pipes, prolonging the service life.

[0004] However, the tube box inside the above-mentioned heat exchanger device is divided into two sides by a partition, and the two communication components installed on both sides of the partition are synchronously and reversely rotated by a transmission assembly to drive the symmetrically arranged alignment components to precisely butt joint the two end inlets of the same pipe, resulting in that the heat exchanger device is only suitable for U-shaped pipe structure, and cannot be adapted to straight pipes. In addition, the existing cleaning mechanism for straight pipes can only flush one pipe at a time, which has low cleaning efficiency and single function, and cannot meet the actual use needs. SUMMARY

[0005] The purpose of the present application is to provide a shell-and-tube heat exchanger to solve the technical problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0007] A shell and tube heat exchanger includes a steam heat exchanger shell, a tube sheet and several heat exchange pipes, and the steam heat exchanger shell is defined as having one side as end A and the other side as end B. The two tube sheets are symmetrically fixed in the steam heat exchanger shell, and the two tube sheets are commonly provided with several tube rows distributed in a ring around the axis of the steam heat exchanger shell, each tube row is composed of several heat exchange pipes distributed radially along the steam heat exchanger shell, and a shaft rod penetrating the two tube sheets is rotatably installed in the steam heat exchanger shell, and movable disks are respectively provided on both sides of the shaft rod, and a pair of second driving mechanisms for driving the axial translation of the movable disks on the same side are symmetrically provided in the shaft rod, and a connecting guide system is provided on the two movable disks. When the two movable disks are respectively in contact and pressed with the tube sheets on the corresponding sides, a water inlet channel is formed at the A end and a water outlet channel is formed at the B end, and the positions of the two correspond. In one rotation cycle of the shaft rod, the water inlet channel and the water outlet channel can be simultaneously aligned and connected with each tube row in sequence.

[0008] Preferably, an annular groove is provided on the side of the two tube sheets away from each other, and an inlet pipe connected to the annular groove on the same side is fixed on the tube sheet at the A end, and the inlet pipe extends vertically upward through the outside of the steam heat exchanger shell, and an outlet pipe connected to the annular groove on the same side is fixed on the tube sheet at the B end, and the outlet pipe extends vertically downward through the outside of the steam heat exchanger shell, and the connecting flow guide system includes a flow channel, a flow port A and a flow port B, and radially extending flow channels are provided at corresponding positions in the two movable disks, and a flow port A and a plurality of flow ports are provided on the side of the two movable disks close to each other. B, and both flow port A and flow port B are connected to the flow channel on the same side, flow port A corresponds to the position of the annular groove on the same side, and the number and spacing of flow port B are consistent with the heat exchange pipes in the tube array. When the movable disk at the A end is pressed against the tube sheet, a water inlet cavity is formed between the annular groove and the end face of the movable disk, which is used to continuously supply the flushing water supplied by the water inlet pipe into the flow channel on a circular path. When the movable disk at the B end is pressed against the tube sheet, a water collecting cavity is formed between the annular groove and the end face of the movable disk, which is used to continuously transport the flushing wastewater to the outlet pipe for discharge on a circumferential path.

[0009] Preferably, a solenoid valve is installed in each of the flow ports A and B.

[0010] Preferably, the second driving mechanism includes an electric push cylinder and a slide seat, a pair of inner cavities and slide grooves are provided in the shaft rod, and horizontally extending electric push cylinders are respectively installed in the two inner cavities, and the two electric push cylinders are arranged in opposite directions. Slide seats are slidably installed in the two slide grooves, and the telescopic ends of the two electric push cylinders respectively extend into the slide grooves and are fixed to the slide seats on the same side. The perforated wall of the movable disk is fixed to the slide seat on the corresponding side, and the perforated wall of the movable disk is tightly slidably fitted to the outer wall of the shaft rod, and the outer surface of the slide seat is tightly slidably fitted to the inner wall of the slide groove.

[0011] Preferably, both ends of the shaft extend through and to the outside of the steam heat exchanger casing. A first driving mechanism for driving the shaft to rotate is provided at the A end of the steam heat exchanger casing. The first driving mechanism includes a reduction motor. A bracket is fixed on the end wall of the steam heat exchanger casing. The reduction motor is fixed on the bracket, and the output shaft is fixedly connected to the end of the shaft through a coupling.

[0012] Preferably, the two movable disks are provided with a plurality of through flow holes B in a circular array, and a sealing disk is rotatably installed on the side of the two movable disks away from each other, and the sealing disk is provided with a plurality of flow holes A in a circular array, and the flow holes A correspond one to one with the flow holes B on the same side. A retaining ring is fixed near both ends on the inner wall of the steam heat exchanger shell, and the retaining ring is squeezed and sealed with the movable disk on the same side. When the two movable disks are respectively pressed against the retaining ring on the same side, an air inlet cavity is formed between the movable disk at the A end and the end wall of the steam heat exchanger shell. An air inlet pipe for supplying air flow to the air inlet cavity is connected to the A end of the steam heat exchanger shell, and the air inlet pipe is connected to the air outlet port of the centrifugal fan. A third driving mechanism is also provided on the side of the two movable disks away from each other, and the third driving mechanism is used to drive the sealing disk to rotate and adjust. When the sealing disk is rotated and adjusted to overlap the flow holes A and the flow holes B, the air flow in the air inlet cavity can pass into each heat exchange pipe from the A end.

[0013] Preferably, a heating tank is connected in series to the air inlet pipe, and a plurality of electric heating elements are installed in the heating tank.

[0014] Preferably, when the two movable disks are respectively pressed against the retaining rings on the same side, an air collecting chamber is formed between the movable disk at the B end and the end wall of the steam heat exchanger shell, and an exhaust chamber is provided inside the end of the shaft away from the air inlet pipe. A number of through air inlets are evenly distributed on the outer wall of the shaft and located in the air collecting chamber, which are used to guide the airflow in the air collecting chamber into the exhaust chamber. A rotating sleeve is provided on the end of the shaft away from the air inlet pipe, which is used to rotatably connect with the interface of the exhaust gas treatment equipment.

[0015] Preferably, the two movable disks are coaxially rotatably mounted on one side of each other with a sleeve seat, the sealing disk is limitedly slidably sleeved on the sleeve seat on the same side, the third driving mechanism includes a worm, a drive motor and a worm wheel, two mounting frames are fixed on the movable disk, the worm is rotatably mounted on the two mounting frames, the drive motor is fixed on one of the mounting frames, and the output shaft is fixedly connected to one end of the worm, and the worm wheel is correspondingly fixedly sleeved on the sleeve seat and correspondingly engaged with the worm on the same side.

[0016] Preferably, a clearance groove is provided on the side where the two sealing disks are close to each other, and an elastic gasket is provided on the sleeve seat between the sealing disk and the movable disk and corresponding to the position of the clearance groove. One end of the elastic gasket abuts the movable disk, and the other end abuts the inner end wall of the clearance groove. Two cams are fixedly sleeved on the worm gear, both of which abut against the sealing disk.

[0017] Compared with the prior art, the present invention has the following beneficial effects.

[0018] In the present invention, the tube rows on the two tube sheets are composed of a plurality of straight heat exchange pipes distributed radially along the shell of the steam heat exchanger. The connecting and guiding system on the movable plate can be precisely aligned with each tube row by rotating the shaft, without relying on the return structure of the U-shaped pipe. This solves the problem that traditional equipment is only suitable for U-shaped pipes and effectively adapts to straight heat exchange pipes. Each tube row contains several heat exchange pipes, and the number and spacing of the flow ports B on the movable disk are consistent with the heat exchange pipes in the tube row. When the connecting diversion system is aligned with a certain tube row, the flushing water supplied by the water inlet chamber can be used to flush all the heat exchange pipes in the tube row at the same time, rather than cleaning each one individually. This greatly reduces the total cleaning time and significantly improves the maintenance efficiency of the tube heat exchanger.

[0019] The water inlet cavity formed by the annular groove at the A end and the movable disk can continuously supply the flushing water of the water inlet pipe to the flow channel on a circular path. The water collecting cavity formed by the annular groove at the B end and the movable disk can continuously collect and discharge the waste water through the outlet pipe. Combined with the connecting structure of the connecting diversion system, it ensures that the flushing water flows stably through the heat exchange pipe during the rotation of the shaft, avoids water supply interruption caused by rotation, and ensures the uniformity of the cleaning effect.

[0020] Solenoid valves are installed in flow ports A and B. When opened during flushing, batch cleaning of the heat exchange pipes can be achieved. By closing other solenoid valves and only opening the solenoid valve corresponding to the target heat exchange pipe, water is injected to maintain pressure and observe whether there is any leakage. The sealing of a single heat exchange pipe can be tested without the need for additional testing equipment, realizing multi-functional integration and reducing maintenance costs.

[0021] The air flow heated by the electric heating element in the heating tank is introduced through the air inlet pipe. When the sealing disk is adjusted to make the flow hole A coincide with the flow hole B, the hot air flows into the heat exchange pipe through the air inlet cavity and the flow hole B. This can not only dry the residual moisture on the inner wall of the heat exchange pipe after flushing, but also discharge the dried dirt with the air flow through the gas collecting cavity, the air inlet and the exhaust cavity, thus preventing the secondary adhesion of dirt or corrosion of the pipe caused by the residual moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the partial structure of the outer surface of the steam heat exchanger shell in the present invention; Figure 3 for Figure 2 Schematic diagram of the cross section of the structure shown; Figure 4 This is a schematic diagram of the local structure of the steam heat exchanger shell at end A; Figure 5 for Figure 2The structure shown omits the schematic diagram of the steam heat exchanger shell; Figure 6 for Figure 5 The structure shown omits the schematic diagram of the movable disk; Figure 7 for Figure 6 A schematic diagram of the structure at center A; Figure 8 for Figure 5 A schematic diagram of a partial cross section of the structure shown; Figure 9 A schematic structural diagram of one side surface of the movable disk in the present invention; Figure 10 A schematic structural diagram of the other side surface of the movable disk in the present invention; Figure 11 for Figure 9 Schematic diagram of the cross section of the structure shown; Figure 12 for Figure 11 A magnified schematic diagram of the structure at point B in the middle; Figure 13 This is a schematic diagram of flushing water flow; Figure 14 Schematic diagram of the drying gas flow.

[0023] In the figure: 01, end A; 02, end B; 03, blocking disk; 031, flow hole A; 032, clearance groove; 04, retaining ring; 05, water inlet chamber; 06, water collecting chamber; 07, air inlet chamber; 08, air collecting chamber; 1, steam heat exchanger housing; 11, water inlet pipe; 12, water outlet pipe; 13, air inlet pipe; 131, heating tank; 132, electric heating element; 2, shaft; 21, exhaust chamber; 22, air inlet; 23, rotating sleeve; 24, first driving mechanism; 241, bracket; 242, reduction motor Machine; 3. Tube sheet; 31. Annular groove; 4. Heat exchange pipe; 5. Movable disk; 501. Sleeve seat; 502. Long groove; 503. Slider; 51. Flow hole B; 6. Second drive mechanism; 601. Inner cavity; 602. Slide groove; 61. Electric push cylinder; 62. Slide seat; 7. Connecting flow guide system; 71. Flow channel; 72. Flow port A; 73. Flow port B; 8. Third drive mechanism; 81. Mounting bracket; 82. Worm; 83. Drive motor; 84. Worm gear; 9. Cam; 91. Elastic washer. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0026] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0027] In the embodiments of the present invention, "and / or" is simply a description of the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0028] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present invention. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0029] Example 1

[0030] See also Figures 1-14The application provides a shell-and-tube heat exchanger, which comprises a steam heat exchanger shell 1, tube plates 3 and a plurality of heat exchange pipes 4, the steam heat exchanger shell 1 is composed of a middle cylindrical shell and two side tube boxes which are fixed and sealed through flanges, one side of the steam heat exchanger shell 1 is defined as an A end 01, the other side is defined as a B end 02, two tube plates 3 are symmetrically fixed in the steam heat exchanger shell 1, and a plurality of tube rows which are distributed in a ring shape around the axis of the steam heat exchanger shell 1 are arranged on the two tube plates 3, each tube row is composed of a plurality of heat exchange pipes 4 which are distributed in a radial direction of the steam heat exchanger shell 1, that is, the heat exchange pipes 4 are regularly arranged along a ring path in the steam heat exchanger shell 1.

[0031] The steam heat exchanger shell 1 is provided with steam inlets and outlets and liquid medium inlets and outlets, a plurality of baffle plates are arranged in the steam heat exchanger shell 1 in a staggered manner, liquid medium flows into one side tube box through the inlet, is then distributed into each heat exchange pipe 4, and finally flows into the other side tube box and is discharged through the liquid medium outlet, so that tube-side flow is realized, steam flows into the steam heat exchanger shell 1 through the steam inlet, passes through the baffle plates along a bending path, and is finally discharged through the steam outlet, so that shell-side flow is realized, and heat exchange between the liquid medium and the steam is realized in the steam heat exchanger shell 1, in addition, the steam heat exchanger shell 1, the tube plates 3, the heat exchange pipes 4, the tube boxes, the baffle plates, the steam inlets and outlets and the liquid medium inlets and outlets are all existing structures in the existing shell-and-tube steam heat exchanger, the connection relationship between the components and the operation principle are all mature technologies, and therefore, no detailed description is given.

[0032] An axle 2 is installed in the steam heat exchanger shell 1 and penetrates the two tube plates 3, movable discs 5 are respectively sleeved on the two sides of the axle 2, the axle 2 can drive the movable discs 5 to rotate in the steam heat exchanger shell 1, a pair of second driving mechanisms 6 are symmetrically arranged in the axle 2, wherein the second driving mechanisms 6 are used for driving the movable discs 5 on the same side to axially translate, in addition, a communication flow guide system 7 is arranged on each movable disc 5, the two movable discs 5 are driven to move close to each other through the two second driving mechanisms 6, finally, the two movable discs 5 can be brought into abutment and compression with the tube plates 3 on the corresponding sides, the two movable discs 5 are driven to move away from each other through the two second driving mechanisms 6, and the movable discs 5 are separated from the tube plates 3 on the same side.

[0033] When the two movable discs 5 are in abutment and compression with the tube plates 3 on the corresponding sides, a water inlet channel is formed at the A end 01 and a water outlet channel is formed at the B end 02, and the positions of the two channels correspond to each other, in one rotation cycle of the axle 2, the water inlet channel and the water outlet channel can be aligned and communicated with each tube row in turn.

[0034] As Figure 5 and Figure 6As shown, an annular groove 31 is provided on the side of the two tube sheets 3 away from each other. A water inlet pipe 11 is fixed to the tube sheet 3 at the A end 01 and is connected to the annular groove 31 on the same side. The water inlet pipe 11 extends vertically upward to the outside of the steam heat exchanger shell 1, and the end of the water inlet pipe 11 is connected to an external clean water supply device (not shown in the figure). A water outlet pipe 12 is fixed to the tube sheet 3 at the B end 02 and is connected to the annular groove 31 on the same side. The water outlet pipe 12 extends vertically downward to the outside of the steam heat exchanger shell 1, and the water outlet pipe 12 is connected to the wastewater treatment equipment (not shown in the figure).

[0035] like Figure 8 and Figure 10 As shown, the connecting flow guide system 7 includes a flow channel 71, a flow port A72 and a flow port B73. A radially extending flow channel 71 is provided at the corresponding position in the two movable disks 5. A flow port A72 and several flow ports B73 are provided on the side where the two movable disks 5 are close to each other, and the flow ports A72 and the flow ports B73 are both connected to the flow channel 71 on the same side. The flow port A72 corresponds to the position of the annular groove 31 on the same side, and the number and spacing of the flow ports B73 are consistent with the heat exchange pipes 4 in the tube array.

[0036] During the process of the shaft 2 driving the movable disk 5 to rotate, when the flow port B73 is aligned with one of the tube rows, the two second driving mechanisms 6 work to drive the two movable disks 5 to move horizontally along the shaft 2 until they contact and press against the tube sheet 3. At the same time, the flow port B73 is pressed and connected with the ends of each heat exchange pipe 4 in the tube row. Figure 13 As shown, a water inlet cavity 05 connected to the water inlet pipe 11 is formed between the annular groove 31 at the A end 01 and the end surface of the movable disk 5. The external cleaning water supply equipment introduces the flushing water into the water inlet cavity 05 through the water inlet pipe 11, and then flows into the flow channel 71 through the flow port A72 in turn, and finally flows into each heat exchange pipe 4 through the flow port B73. The flushing water flows through each heat exchange pipe 4 and can flush the inside of each heat exchange pipe 4 in the pipe array.

[0037] At the same time, if Figure 13 As shown, a water collecting chamber 06 connected to the outlet pipe 12 is formed between the annular groove 31 at the B end 02 and the end surface of the movable disk 5. The flushing waste liquid mixed with dirt in the heat exchange pipe 4 flows into the flow channel 71 through the flow port B73 out of the B end 02, and flows into the water collecting chamber 06 through the flow port A72, and is finally discharged to the wastewater treatment equipment through the outlet pipe 12 for treatment, thereby realizing flushing and cleaning in a single tube column.

[0038] When one of the tube rows is cleaned, the second drive mechanism 6 drives the movable disk 5 to separate from the tube sheet 3. Then, the shaft 2 drives the movable disk 5 to rotate a certain angle so that the connecting guide system 7 is aligned with the tube row at the next position. The above steps are repeated to complete the flushing and cleaning of each heat exchange pipe 4 one by one.

[0039] In addition, electromagnetic valves (not shown in the figure) are installed in each of the flow ports A72 and B73. When cleaning, the electromagnetic valves are controlled to be in an open state to ensure that the flushing water can flow normally. When the heat exchange is working, the electromagnetic valves are controlled to be in a closed state to avoid liquid medium flowing into the water inlet cavity 05 or the water collection cavity 06 to cause leakage.

[0040] Secondly, by controlling only one electromagnetic valve on one side to be in an open state, water is filled into the corresponding heat exchange pipeline 4, and then the two electromagnetic valves at the position are controlled to be closed. After a period of time, it is observed whether water flows out from the steam outlet to determine whether the heat exchange pipeline 4 is damaged or not, thereby realizing leakage detection of a single heat exchange pipeline 4.

[0041] It can be seen that the communication guide system 7 in the heat exchanger can not only realize flushing and cleaning of the heat exchange pipeline 4, but also realize leakage detection of the heat exchange pipeline 4, achieving two goals at once.

[0042] Embodiment 2

[0043] Please refer to Figure 8 The difference between this embodiment and embodiment 1 is that: The second driving mechanism 6 includes electric push cylinders 61 and sliding seats 62. The shaft rod 2 is provided with a pair of inner cavities 601 and sliding grooves 602. The two inner cavities 601 are respectively provided with horizontally extending electric push cylinders 61. The two electric push cylinders 61 are reversely arranged. The two sliding grooves 602 are respectively provided with slidingly installed sliding seats 62. The two electric push cylinders 61 are respectively extended to the sliding grooves 602 and are fixed to the sliding seats 62 on the same side. The perforated wall of the movable disc 5 is fixed to the sliding seat 62 on the corresponding side. The electric push cylinders 61 are extended and retracted to drive the sliding seats 62 to slide in the sliding grooves 602, thereby driving the movable disc 5 to slide left and right along the shaft rod 2, and providing stable driving for the translation adjustment of the shaft rod 2.

[0044] In addition, the electric push cylinders 61 are installed in the inner cavities 601, and the extension rods thereof are mechanically sealed with the sliding holes between the inner cavities 601 and the sliding grooves 602 in the shaft rod 2, so as to avoid liquid from seeping into the inner cavities 601 to affect the electric push cylinders 61. The specific sealing mode adopts the prior art, and will not be described in detail herein.

[0045] In addition, the perforated wall of the movable disc 5 is tightly and slidably attached to the outer wall of the shaft rod 2, and the outer surface of the sliding seat 62 is tightly and slidably attached to the inner wall of the sliding groove 602, so as to ensure the sealing property of the movable disc 5 sliding along the shaft rod 2, and avoid liquid medium from seeping to the other side of the movable disc 5. The specific sealing mechanism adopts the prior art, and will not be described in detail herein.

[0046] Embodiment 3

[0047] Please refer to Figure 4 The difference between this embodiment and embodiment 2 is that: The shaft rod 2 extends through to the outside of the steam heat exchanger shell 1 at both ends, and the A end 01 of the steam heat exchanger shell 1 is provided with a first driving mechanism 24 for driving the rotation of the shaft rod 2, the first driving mechanism 24 comprising a speed reducer motor 242, a bracket 241 is fixed on the end wall of the steam heat exchanger shell 1, the speed reducer motor 242 is fixed on the bracket 241, and the output shaft is fixedly connected with the end of the shaft rod 2 through a shaft coupling, and the speed reducer motor 242 works, and its output end can drive the shaft rod 2 to rotate under the driving action of the shaft coupling, thereby providing stable driving for the rotation of the shaft rod 2 and the movable disc 5.

[0048] Embodiment 4 Please refer to Figure 4 、 Figure 5 、 Figure 8 、 Figure 9 、 Figure 11 and Figure 12 , the difference between this embodiment and embodiment 3 is: The two movable discs 5 are provided with a plurality of through flow holes B51 in annular array on the side away from each other, and the movable disc 5 is rotatably installed with a blocking disc 03 on the side away from each other, the blocking disc 03 is provided with a plurality of flow holes A031 in annular array, the flow holes A031 and the flow holes B51 on the same side are one-to-one corresponding, and the inner wall of the steam heat exchanger shell 1 is fixed with a blocking ring 04 near the two ends, and the blocking ring 04 is in sealing contact with the movable disc 5 on the same side.

[0049] When the second driving mechanism 6 drives the two movable discs 5 to move to the position of pressing the corresponding blocking ring 04, as shown in Figure 14 , the movable disc 5 at the A end 01 forms an air inlet cavity 07 with the end wall of the steam heat exchanger shell 1, and the A end 01 of the steam heat exchanger shell 1 is connected with an air inlet pipe 13 for supplying air flow into the air inlet cavity 07, and the air inlet pipe 13 is further connected with a heating tank 131, and a plurality of electric heating elements 132 are installed in the heating tank 131, and the electric heating elements 132 generate heat when electrified, for heating the air flow entering the heating tank 131, and the electric heating elements 132 can be electric heating pipes or electric heating nets, and the air inlet pipe 13 is in communication with the air outlet port of the centrifugal fan (not shown in the figure).

[0050] A third driving mechanism 8 is also provided on the side where the two movable disks 5 are away from each other. The third driving mechanism 8 is used to drive the sealing disk 03 to rotate and adjust. When the sealing disk 03 is rotated and adjusted to the point where the circulation hole A031 and the circulation hole B51 overlap, the air is sucked into the air inlet pipe 13 by the operation of the centrifugal fan. When the air flows through the heating tank 131, the electric heating element 132 is used to heat the air to form a hot air flow, and the hot air enters the air inlet cavity 07. Subsequently, the hot air flows through the circulation hole A031 and the circulation hole B51 into the other side of the movable disk 5, and finally flows into each heat exchange pipe 4. On the one hand, the moisture remaining on the inner wall of the heat exchange pipe 4 after flushing can be dried, and on the other hand, the dirt adhered to the inner wall of the heat exchange pipe 4 due to moisture can be dried and blown out together.

[0051] Example 5

[0052] See also Figure 14 The difference between this embodiment and embodiment 4 is that: When the movable disk 5 at the B end 02 is pressed against the retaining ring 04 on the same side, a gas collecting cavity 08 is formed between the movable disk 5 and the end wall of the steam heat exchanger shell 1. Figure 7 As shown, an exhaust chamber 21 is provided inside the end of the shaft rod 2 away from the air intake pipe 13, and a number of through-air inlets 22 are evenly distributed on the outer wall of the shaft rod 2 and located in the air collecting chamber 08, which are used to guide the airflow in the air collecting chamber 08 into the exhaust chamber 21. A rotating sleeve 23 is provided on the end of the shaft rod 2 away from the air intake pipe 13, which is used to be rotatably connected to the interface of the exhaust gas treatment equipment (not shown in the figure) to adapt to the rotation of the shaft rod 2.

[0053] The hot air carrying dirt flows through the flow hole B51 and the flow hole A031 at the B end 02 into the collecting chamber 08, and flows into the exhaust chamber 21 through the air inlet 22, and finally discharged into the exhaust gas treatment equipment through the rotating sleeve 23 for further treatment after waste heat recovery.

[0054] In addition, when the two movable disks 5 are pressed against the corresponding retaining rings 04 to form the air inlet chamber 07 and the air collecting chamber 08, the sealing disk 03 is rotated and adjusted to make the flow hole A031 and the flow hole B51 misaligned. The sealing disk 03 is used to block each flow hole B51, thereby forming a closed space on both sides of the steam heat exchanger shell 1. The third driving mechanism 8 is arranged in the closed space to provide effective protection and avoid the intrusion of liquid medium.

[0055] Example 6

[0056] See also Figure 11 and Figure 12 The difference between this embodiment and embodiment 5 is that: The two movable disks 5 are coaxially rotatably installed on the side away from each other, and the sealing disk 03 is slidingly sleeved on the sleeve seat 501 on the same side. Specifically, a number of long grooves 502 are evenly distributed on the peripheral wall of the sleeve seat 501, and a slider 503 is slidably installed in each long groove 502. The sliders 503 are fixed to the inner walls of the holes on the sealing disk 03 to realize the limited sliding installation of the sealing disk 03.

[0057] The third driving mechanism 8 includes a worm 82, a driving motor 83 and a worm gear 84. Two mounting brackets 81 are fixed on the movable disk 5. The worm 82 is rotatably mounted on the two mounting brackets 81. The driving motor 83 is fixed on one side of the mounting bracket 81, and the output shaft is fixedly connected to one end of the worm 82. The worm gear 84 is fixedly sleeved on the sleeve seat 501 and engages with the worm 82 on the same side.

[0058] The worm 82 is driven to rotate by the driving motor 83, and the rotating worm 82 engages and drives the worm wheel 84 and drives the sleeve seat 501 to rotate, thereby driving the sealing disk 03 to rotate, providing effective drive for the sealing disk 03 to rotate and realize the opening and closing of the air flow channel. In addition, the one-way transmission of the worm 82 and the worm wheel 84 has a self-locking effect.

[0059] Specifically, a clearance groove 032 is provided on the side where the two sealing disks 03 are close to each other, and an elastic gasket 91 is provided on the sleeve seat 501 between the sealing disk 03 and the movable disk 5 and corresponding to the position of the clearance groove 032. The clearance groove 032 makes space for the elastic gasket 91, and one end of the elastic gasket 91 abuts against the movable disk 5, and the other end abuts against the inner end wall of the clearance groove 032. Two cams 9 are fixedly mounted on the worm 82, both of which are in contact with the sealing disk 03.

[0060] In the process of the third driving mechanism 8 driving the sealing disk 03 to rotate so that the flow hole A031 is aligned and connected with the flow hole B51, the protrusion on the elastic gasket 91 gradually moves away from the sealing disk 03. Under the elastic force of the elastic gasket 91, the sealing disk 03 is pushed gradually away from the movable disk 5. On the one hand, excessive wear between the sealing disk 03 and the movable disk 5 is avoided to affect the sealing effect during compression. On the other hand, the gap between the sealing disk 03 and the movable disk 5 is increased, which facilitates the air to flow from between the sealing disk 03 and the movable disk 5 into the flow hole B51, thereby realizing air intake replenishment.

[0061] In the process of the third driving mechanism 8 driving the sealing disk 03 to rotate so that the flow hole A031 and the flow hole B51 are misaligned to block the flow hole B51, the protrusion on the elastic gasket 91 gradually approaches the sealing disk 03, and the elastic gasket 91 is used to gradually push the sealing disk 03 toward the side of the movable disk 5. At the same time, the elastic gasket 91 is compressed and accumulates force. Finally, when the sealing disk 03 completely blocks the flow hole B51, the sealing disk 03 and the movable disk 5 are tightly pressed together, effectively improving the sealing performance.

[0062] The control mode of the present application is automatically controlled by a controller, the control circuit of the controller can be realized by simple programming by those skilled in the art, and the power supply also belongs to the common knowledge in the art, so the control mode and the circuit connection of the present application will not be explained in detail.

[0063] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application.

Claims

1. A shell and tube heat exchanger comprising a steam heat exchanger shell (1), a tube sheet (3) and a plurality of heat exchange pipes (4), wherein one side of the steam heat exchanger shell (1) is defined as end A (01) and the other side is defined as end B (02), and wherein: The two tube sheets (3) are symmetrically fixed in the steam heat exchanger shell (1), and the two tube sheets (3) are jointly provided with a plurality of tube rows annularly distributed around the axis of the steam heat exchanger shell (1), and each tube row is composed of a plurality of heat exchange pipes (4) distributed radially along the steam heat exchanger shell (1); A shaft (2) penetrating two tube sheets (3) is rotatably mounted in the steam heat exchanger housing (1), movable disks (5) are respectively mounted on both sides of the shaft (2), and a pair of second drive mechanisms (6) for driving the movable disks (5) on the same side to axially translate are symmetrically arranged in the shaft (2); Both movable discs (5) are provided with a connecting flow guide system (7). When the two movable discs (5) are respectively pressed against the tube sheets (3) on the corresponding sides, a water inlet channel is formed at the A end (01) and a water outlet channel is formed at the B end (02), and the positions of the two channels correspond to each other. In one rotation cycle of the shaft (2), the water inlet channel and the water outlet channel can be aligned and communicated with each tube row in sequence at the same time.

2. The shell and tube heat exchanger according to claim 1, characterized in that: An annular groove (31) is provided on each side of the two tube sheets (3) away from each other; A water inlet pipe (11) is fixed on the tube plate (3) at the A end (01) and is in communication with the annular groove (31) on the same side. The water inlet pipe (11) extends vertically upward to the outside of the steam heat exchanger shell (1); A water outlet pipe (12) is fixed on the tube plate (3) at the B end (02) and is in communication with the annular groove (31) on the same side. The water outlet pipe (12) extends vertically downward to the outside of the steam heat exchanger shell (1); The communication and flow guiding system (7) comprises a flow channel (71), a flow port A (72) and a flow port B (73); The flow channels (71) extending radially are provided at corresponding positions in the two movable discs (5); A flow port A (72) and a plurality of flow ports B (73) are provided on the side of the two movable discs (5) close to each other, and the flow ports A (72) and the flow ports B (73) are both communicated with the flow channel (71) on the same side; The flow port A (72) corresponds to the position of the annular groove (31) on the same side, and the number and spacing of the flow ports B (73) are consistent with those of the heat exchange pipes (4) in the pipe array; When the movable disc (5) at the A end (01) is pressed against the tube plate (3), a water inlet cavity (05) is formed between the annular groove (31) and the end surface of the movable disc (5), for continuously supplying the flushing water supplied by the water inlet pipe (11) to the flow channel (71) along a circumferential path; When the movable disc (5) at the B end (02) is pressed against the tube plate (3), a water collecting chamber (06) is formed between the annular groove (31) and the end surface of the movable disc (5), which is used to continuously transport the flushing wastewater to the outlet pipe (12) for discharge on a circumferential path.

3. The shell and tube heat exchanger according to claim 2, characterized in that: A solenoid valve is installed in each of the flow ports A (72) and the flow port B (73).

4. The shell and tube heat exchanger according to claim 1, characterized in that: The second driving mechanism (6) comprises an electric push cylinder (61) and a slide seat (62); A pair of inner cavities (601) and a sliding groove (602) are provided in the shaft (2); The two inner cavities (601) are respectively installed with the horizontally extending electric push cylinders (61), and the two electric push cylinders (61) are arranged in opposite directions; A slide seat (62) is slidably installed in each of the two slide grooves (602), and the telescopic ends of the two electric push cylinders (61) respectively extend through the slide grooves (602) and are fixed to the slide seat (62) on the same side. The perforated wall of the movable disk (5) is fixed to the sliding seat (62) on the corresponding side; The perforated wall of the movable disk (5) and the outer wall of the shaft (2) are tightly slidably fitted; The outer surface of the slide seat (62) and the inner wall of the slide groove (602) are tightly slidably fitted.

5. The shell and tube heat exchanger according to claim 1, characterized in that: Both ends of the shaft (2) extend through the outside of the steam heat exchanger housing (1), and a first driving mechanism (24) for driving the shaft (2) to rotate is provided at the A end (01) of the steam heat exchanger housing (1); The first driving mechanism (24) includes a reduction motor (242); A bracket (241) is fixed to the end wall of the steam heat exchanger shell (1), the reduction motor (242) is fixed to the bracket (241), and the output shaft is fixedly connected to the end of the shaft (2) via a coupling.

6. The shell and tube heat exchanger according to claim 1, characterized in that: Both movable disks (5) are provided with a plurality of through-flow holes B (51) in an annular array; A blocking disk (03) is rotatably mounted on one side of the two movable disks (5) away from each other, and a plurality of flow holes A (031) are provided in a circular array on the blocking disk (03), and the positions of the flow holes A (031) and the flow holes B (51) on the same side correspond one to one; A retaining ring (04) is fixed on the inner wall of the steam heat exchanger shell (1) near both ends, and the retaining ring (04) is squeezed and sealed with the movable disk (5) on the same side; When the two movable disks (5) are respectively pressed against the retaining ring (04) on the same side, an air inlet cavity (07) is formed between the movable disk (5) at the A end (01) and the end wall of the steam heat exchanger shell (1); An air inlet pipe (13) for supplying air flow into the air inlet cavity (07) is connected to the A end (01) of the steam heat exchanger housing (1), and the air inlet pipe (13) is in communication with an air outlet port of a centrifugal fan; A third driving mechanism (8) is further provided on the side of the two movable disks (5) that are away from each other, and the third driving mechanism (8) is used to drive the blocking disk (03) to rotate and adjust; When the blocking disk (03) is rotated and adjusted until the flow hole A (031) and the flow hole B (51) overlap, the air flow in the air inlet cavity (07) can flow into each of the heat exchange pipes (4) from the A end (01).

7. The shell and tube heat exchanger according to claim 6, characterized in that: A heating tank (131) is also connected in series to the air inlet pipe (13), and a plurality of electric heating elements (132) are installed in the heating tank (131).

8. The shell and tube heat exchanger according to claim 6, characterized in that: When the two movable disks (5) are respectively pressed against the retaining ring (04) on the same side, an air collecting cavity (08) is formed between the movable disk (5) at the B end (02) and the end wall of the steam heat exchanger shell (1); An exhaust cavity (21) is provided inside one end of the shaft (2) away from the air inlet pipe (13), and a plurality of through-flowing air inlets (22) are evenly distributed on the outer wall of the shaft (2) and located inside the air collecting cavity (08), for guiding the air flow in the air collecting cavity (08) into the exhaust cavity (21); A rotating socket (23) is provided on the end of the shaft (2) away from the air inlet pipe (13) for rotationally connecting to an interface of the exhaust gas treatment equipment.

9. The shell and tube heat exchanger according to claim 6, characterized in that: The two movable discs (5) are both coaxially rotatably mounted with sleeve seats (501) on the sides away from each other; The blocking disc (03) is limitedly slidably mounted on the sleeve seat (501) on the same side; The third driving mechanism (8) includes a worm (82), a driving motor (83) and a worm wheel (84); Two mounting frames (81) are fixed on the movable disk (5), and the worm (82) is rotatably mounted on the two mounting frames (81); The driving motor (83) is fixed on one side of the mounting frame (81), and the output shaft is fixedly connected to one end of the worm (82); The worm wheel (84) is fixedly sleeved on the sleeve seat (501) and meshes with the worm (82) on the same side.

10. The shell and tube heat exchanger according to claim 9, characterized in that: The two sealing discs (03) are each provided with a clearance groove (032) on one side close to each other; Elastic washers (91) are sleeved on the sleeve seat (501) at positions between the blocking disc (03) and the movable disc (5) and corresponding to the positions of the clearance grooves (032); One end of the elastic washer (91) abuts against the movable disk (5), and the other end abuts against the inner end wall of the clearance groove (032); Two cams (9) are fixedly mounted on the worm (82) and are in contact with the sealing disk (03).

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