Pipe fixing mechanism and heat recovery device

Abstract

The present invention relates to the technical field of heat recovery devices, and disclosed are a pipe fixing mechanism and a heat recovery device. The pipe fixing mechanism comprises: fixing plates (505), one side of each fixing plate being a pressing portion (5051), and the other side thereof being a limiting portion (5052), the limiting portion (5052) being provided with a limiting slot, and the fixing plate having a first position, a second position, and a third position; screw rod assemblies, vertically arranged and threadedly fitted with the corresponding fixing plates (505); and limiting assemblies, having a locked position where each limiting assembly slides to the corresponding limiting slot (5053) and an unlocked position where each limiting assembly slides out of the corresponding limiting slot (5053).

Description

A pipe fixing mechanism and a heat recovery device Technical Field

[0001] This invention relates to the field of heat recovery device technology, specifically to a pipe fixing mechanism and a heat recovery device. Background Technology

[0002] Steam turbine operation is a crucial part of power plants, affecting the operation of generators, boilers, and turbine units. Heat recovery units are extremely common auxiliary equipment in the operation of power plant steam turbines; also known as waste heat recovery units, their main function is to recover heat, improve energy utilization efficiency, and they are characterized by their compact structure.

[0003] To recover heat and save energy, a heat recovery unit is needed as an auxiliary device. First, water is introduced into the unit through an inlet pipe. Then, flue gas is passed through the unit through an inlet pipe. The heat in the flue gas is absorbed by the water inside the unit, raising its temperature and recovering the heat. The hot water is then discharged from the unit through an outlet pipe for use. However, the heat recovery unit requires connecting pipes for water inlet and outlet. Workers typically use bolts for connection, but this method is cumbersome, requiring repeated turning of multiple bolts and nuts to secure the pipes to the unit. It also necessitates preparing bolts and nuts beforehand, making it inconvenient and affecting the unit's usability. Summary of the Invention

[0004] In view of this, the present invention provides a pipe fixing mechanism and a heat recovery device to solve the problem of cumbersome pipe connection methods in the present invention.

[0005] In a first aspect, the present invention provides a pipe fixing mechanism, comprising: a fixing plate, one side of which is a pressing part, and the other side of which is a limiting part, wherein a limiting groove is formed on the limiting part; the fixing plate having a first position, a second position, and a third position; when the fixing plate is in the first position, the orthographic projection of the pressing part of the fixing plate does not fall on the inlet pipe flange; when the fixing plate is in the second position, the pressing part of the fixing plate is located directly above the connecting pipe flange and the inlet pipe flange, and there is a gap between the pressing part and the connecting pipe flange; when the fixing plate is in the third position, the fixing plate abuts against the connecting pipe flange; and a screw assembly, wherein the screw assembly is vertically arranged. The screw assembly is threadedly fitted to the fixed plate, and its bottom end is rotatably mounted on the top wall of the heat recovery unit. A limiting assembly is also included, capable of sliding, having a locked position when sliding into a limiting groove and an unlocked position when sliding out of the limiting groove. Before the connecting pipe connects to the inlet pipe, when the limiting assembly moves to the unlocked position, the rotation of the screw assembly directly drives the fixed plate to rotate, moving the fixed plate to the first position to provide clearance for the installation of the connecting pipe. After the connecting pipe connects to the inlet pipe, the fixed plate moves to the second position, and when the limiting assembly moves to the locked position, the rotation of the screw assembly drives the fixed plate to descend, moving the fixed plate to the third position.

[0006] Secondly, the present invention provides a heat recovery device, comprising: a recovery device body, the interior of which is a water storage cavity; an inlet pipe communicating with the water storage cavity is provided at the top of the recovery device body; an outlet pipe communicating with the water storage cavity is provided on the side of the recovery device body; an air inlet pipe is also provided on the recovery device body, the air inlet pipe passing through the water storage cavity and not communicating with the water storage cavity; at least two pipe fixing mechanisms, each of which is circumferentially spaced around the inlet pipe, the pipe fixing mechanism being used to position the connecting pipe onto the inlet pipe. Attached Figure Description

[0007] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1 is a three-dimensional structural schematic diagram of one or more embodiments of the present invention;

[0009] Figure 2 is a top-view three-dimensional structural diagram of one or more embodiments of the present invention;

[0010] Figure 3 is a schematic diagram of the front view structure in one or more embodiments of the present invention;

[0011] Figure 4 is a schematic diagram of the front view cross-section structure in one or more embodiments of the present invention;

[0012] Figure 5 is a front sectional view of a pipe fixing mechanism according to one or more embodiments of the present invention;

[0013] Figure 6 is a schematic diagram of the three-dimensional structure of the slide rail in one or more embodiments of the present invention;

[0014] Figure 7 is a front sectional view of a cleaning mechanism in one or more embodiments of the present invention.

[0015] Explanation of reference numerals in the attached drawings: 1. Main body of the recycler; 2. Air inlet pipe; 3. Water inlet pipe; 301. Water inlet pipe flange; 4. Water outlet pipe; 5. Pipe fixing mechanism; 501. Sealing ring; 502. Connecting pipe; 5021. Connecting pipe flange; 503. Limiting pin; 504. Fixing pin; 505. Fixing plate; 5051. Extrusion part; 5052. Limiting part; 5053. Limiting groove; 506. Threaded rod; 507. Limiting component; 5071. Sliding plate; 5072. L-shaped limiting plate; 508. Slide rail; 5081. Slide groove; 509. Bearing seat; 6. Cleaning mechanism; 602. Fixing seat; 603. Guide rod; 604. Guide plate; 605. Magnet; 606. Cleaning sponge; 7. Transparent observation window. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] During the use of a heat recovery unit, pipes need to be connected to allow water to flow in and out. However, when workers connect the pipes, they usually use bolts to connect them. This method of connecting pipes is cumbersome. It requires repeatedly turning multiple sets of bolts and nuts to fix the pipes to the heat recovery unit. In addition, bolts and nuts need to be prepared in advance, which is not convenient and affects the use of the heat recovery unit.

[0018] Based on this, the present invention provides a heat recovery device that uses a pipe fixing mechanism to fix the connecting pipe, preventing the connecting pipe from moving at will, and thus completing the installation of the connecting pipe without repeatedly turning multiple sets of bolts, saving time and effort.

[0019] Example 1

[0020] According to an embodiment of the present invention, in a first aspect, a pipe fixing mechanism is provided, as shown in Figures 1, 2, 3, 4, 5, 6 and 7, comprising a fixing plate 505, a screw assembly and a limiting assembly.

[0021] One side of the fixing plate 505 is a pressing part 5051, and the other side is a limiting part 5052. A limiting groove 5053 is provided on the limiting part 5052. The fixing plate 505 has a first position, a second position, and a third position. When the fixing plate 505 is in the first position, the orthographic projection of the pressing part 5051 of the fixing plate 505 does not fall on the inlet pipe flange, meaning that the connecting pipe 502 can be connected to the inlet pipe 3 at this time. When the fixing plate 505 is in the second position, the pressing part 5051 of the fixing plate 505 is located directly above the connecting pipe flange 5021 and the inlet pipe flange 301, and there is a gap between the pressing part 5051 and the connecting pipe flange 5021. When the fixing plate 505 is in the third position, the fixing plate 505 abuts against the connecting pipe flange 5021, meaning that the connecting pipe flange 5021 and the inlet pipe flange 301 are locked and positioned by the fixing plate 505. The screw assembly is vertically positioned and threaded onto the fixing plate 505. The bottom end of the screw assembly is rotatably mounted on the top wall of the heat recovery unit. The limiting assembly is slidable, having a locking position when sliding into the limiting groove 5053 and an unlocking position when sliding out of the limiting groove 5053. Before the connecting pipe is connected to the inlet pipe, when the limiting assembly moves to the unlocking position, the rotation of the screw assembly directly drives the fixing plate 505 to rotate, moving the fixing plate 505 to the first position to provide clearance for the installation of the connecting pipe.

[0022] After the connecting pipe is connected to the inlet pipe, the fixed plate 505 moves to the second position. When the limiting component moves to the locked position, it slides into the limiting groove 5053, restricting the swing of the fixed plate 505. When the screw assembly rotates, it drives the fixed plate 505 to descend, moving it to the third position. In the third position, the fixed plate 505 is tightly abutted against the flange, forming a rigid lock and avoiding the risk of loosening caused by thread wear of traditional bolts.

[0023] The aforementioned pipe fixing mechanism can fix the connecting pipe 502, preventing the connecting pipe 502 from moving at will. This eliminates the need to repeatedly rotate multiple sets of bolts. By switching the positions of the fixing plate 505 and the limiting component, the installation of the connecting pipe can be completed quickly, saving time and effort and facilitating pipe connection.

[0024] In this embodiment, the fixing plate 505 is used to press the connecting pipe flange 5021 tightly. Compared with the traditional bolt connection, the contact area between the fixing plate 505 and the connecting pipe flange 5021 is larger, the force on the connecting pipe flange 5021 is more uniform, the sealing performance is better, the risk of leakage is reduced, and the stability in long-term use is better than that of bolt connection, reducing the maintenance frequency.

[0025] This embodiment controls the clamping height of the fixing plate 505 by the number of rotations of the screw assembly, accommodating differences in flange thickness and applicable to various specifications of inlet pipes and connecting pipes, demonstrating strong versatility. It reduces rework issues caused by dimensional mismatches in traditional solutions.

[0026] In this embodiment, the unlocking and locking positions need to be switched manually to prevent the fixing plate 505 from moving accidentally and reduce the risk of human error during installation.

[0027] In some embodiments, the limiting assembly includes a slide rail 508 and a limiting member 507. The slide rail 508 is welded and fixedly mounted on the top wall of the heat recovery unit, and a groove 5081 is provided at the top of the slide rail 508. The limiting member 507 includes a sliding plate 5071 and an L-shaped limiting plate 5072. The sliding plate 5071 is slidably fitted in the groove, and the L-shaped limiting plate 5072 has a horizontal plate and a vertical plate. The horizontal plate is connected to the sliding plate 5071, and the vertical plate is adapted to the limiting groove 5053.

[0028] In addition, the sliding plate 5071 is provided with buckles on both sides extending upward from the slide groove 5081, and the slide rail 508 is provided with two locking positions. When the limiting component moves to the locking position, the buckles are locked into the locking positions to achieve a tight lock between the limiting component 507 and the slide rail 508.

[0029] In some embodiments, the screw assembly includes a threaded rod 506, a bearing housing 509, and an operating handle. The threaded rod 506 is threadedly fitted to a fixed plate 505. The bearing housing 509 is fixedly mounted on the top wall of the heat recovery unit, and the bottom end of the threaded rod 506 is rotatably connected to the bearing housing 509. The operating handle is located at the top end of the threaded rod 506 for easy hand gripping.

[0030] In some embodiments, a fixing pin 504 is provided at the bottom end of the pressing part 5051 of the fixing plate 505. The fixing pin 504 is adapted to the positioning hole opened at the top end of the connecting pipe flange 5021. When the fixing plate 505 is in the third position, the fixing pin 504 is inserted into the positioning hole.

[0031] In this embodiment, the retaining pin 504, in conjunction with the positioning hole, forms a precise positioning guide, ensuring accurate relative positioning between the fixing plate 505 and the docking pipe flange 5021. The insertable retaining pin effectively prevents the fixing plate 505 from shifting or sliding during the clamping process. After the retaining pin 504 is inserted into the positioning hole, it provides an additional mechanical locking function, preventing the fixing plate 505 from accidentally loosening under vibration or other external forces, improving the safety of equipment operation and reducing the risk of accidents caused by loose connections. The retaining pin 504, in conjunction with the positioning hole, forms a precise positioning guide, ensuring accurate relative positioning between the fixing plate 505 and the docking pipe flange 5021. The insertable retaining pin effectively prevents the fixing plate 505 from shifting or sliding during the clamping process.

[0032] In some embodiments, the pipe fixing mechanism further includes multiple limiting pins 503, which are fixedly disposed at the bottom end of the connecting pipe flange 5021. The top end of the water inlet flange 301 has multiple limiting holes corresponding to the positions of the limiting pins 503, and the limiting pins 503 are adapted to these limiting holes. When connecting the connecting pipe 502 and the water inlet pipe 3, the limiting pins can be used to initially position the connecting pipe flange 5021 and the water inlet flange 301, ensuring that the two flanges can be quickly and accurately aligned before connection. The presence of the limiting pins 503 effectively restricts the relative movement between the two flanges, preventing misalignment during subsequent tightening.

[0033] According to an embodiment of the present invention, in a second aspect, a heat recovery device is provided, comprising a recovery device body 1 and at least two pipe fixing mechanisms. The fixing plates 505 in each pair of pipe fixing mechanisms are symmetrically distributed about the vertical midline of the inlet pipe 3.

[0034] The interior of the main body 1 of the recycler is a water storage chamber. A water inlet pipe 3, communicating with the water storage chamber, is located at the top of the main body 1. A water outlet pipe 4, also communicating with the water storage chamber, is located on the side of the main body 1. An air inlet pipe 2 is also installed on the main body 1, passing through the water storage chamber but not communicating with it. Pipe fixing mechanisms 5 are circumferentially spaced around the water inlet pipe 3, and are used to position the connecting pipe 502 onto the water inlet pipe 3.

[0035] In some embodiments, a sealing ring 501 is connected to the top end of the water inlet pipe 3. The top end of the sealing ring 501 is connected to the connecting pipe 502. The sealing ring 501 can ensure the sealing performance when the water inlet pipe 3 is connected to the connecting pipe 502.

[0036] In some embodiments, a transparent observation window 7 is embedded in the wall of the heat recovery unit 1, allowing observation of the water storage chamber. When impurities adhere to the outer wall of the transparent observation window 7, it will affect the observation effect. Therefore, in this embodiment, a cleaning mechanism 6 is provided outside the transparent observation window 7 to clean the outer wall of the transparent observation window 7. The transparent observation window 7 allows workers to easily observe the internal working conditions of the heat recovery unit from the outside, facilitating timely detection of problems. Then, a guide plate is moved to cause the cleaning sponge to rub against the outer wall of the transparent observation window 7, thereby cleaning the dirt adhering to the outer wall of the transparent observation window 7 and preventing dirt from affecting the worker's observation of the internal condition of the heat recovery unit. This facilitates cleaning during the use of the heat recovery unit.

[0037] The cleaning mechanism 6 includes a fixed base 602, guide rods 603, guide plates 604, and a cleaning sponge 606. A pair of fixed bases 602 are vertically spaced on the outer wall of the collector body 1, located on the left and right sides of the transparent observation window 7. The fixed bases 602 are bolted to the collector body 1. A pair of guide rods 603 are horizontally positioned between the two fixed bases 602, located on the upper and lower sides of the transparent observation window 7. The guide rods 603 are symmetrically distributed about the horizontal midline of the fixed bases 602. The guide plate 604 is slidably mounted on the two guide rods 603, vertically arranged, and spaced from the transparent observation window 7.

[0038] The cleaning sponge 606 is placed on the side wall of the guide plate 604 facing the transparent observation window 7, and the outer wall of the cleaning sponge 606 is in contact with the transparent observation window 7.

[0039] In this embodiment, the guide rod 603 and the guide plate 604 work together to allow the cleaning sponge 606 to slide and wipe the outer wall of the transparent observation window 7, removing stains and impurities from the surface of the observation window and keeping it clean. This avoids the risk of misjudgment caused by a blurry observation window and improves the overall operational reliability of the equipment.

[0040] In some embodiments, the fixing base 602 is an iron fixing base; magnets 605 are provided at the top and / or bottom of the guide plate 604. When the guide plate 604 moves to a position in contact with the fixing base 602, the magnets 605 attract the fixing base 602 to lock the guide plate 604 onto the fixing base 602, thereby limiting the guide plate 604 and preventing it from moving arbitrarily.

[0041] As a further improved implementation, an energy storage tank is added at the end of the outlet pipe 4, filled with a high-temperature phase change material (such as paraffin-based composite material) to absorb and store excess heat. When the power plant needs to replenish heat energy, the heat in the storage tank is released to the secondary circulation system (such as heating or steam generation) through an electrically controlled valve. A multi-stage heat exchange structure is designed, with flue gas passing through a high-temperature zone and a medium-temperature zone sequentially, recovering heat energy at different temperature levels. This embodiment improves the overall energy utilization rate to over 85%, solves the problem of waste heat fluctuation, and is suitable for combined heat and power (CHP) scenarios.

[0042] The process of connecting the pipes to the aforementioned heat recovery unit is as follows:

[0043] To recover heat and save energy, a heat recovery device is required, necessitating the connection of pipes for water flow in and out. Before connecting the docking pipe 502 to the inlet pipe 3, manually move the limiting member 507 so that its bottom end moves along the slide rail 508 away from the inlet pipe 3 until the limiting member 507 disengages from the limiting groove 5053 on the fixing plate 505. This releases the limiting effect on the fixing plate 505, allowing the worker to rotate the threaded rod 506 without the fixing plate 505 moving vertically, instead rotating along with it. Rotating the threaded rod 506 causes the fixing plate 505 to rotate until it moves away from above the inlet pipe 3, thus providing clearance for the installation of the docking pipe 502.

[0044] When connecting the connecting pipe 502 to the inlet pipe 3, the connecting pipe 502 and the inlet pipe 3 are brought into contact. Since a sealing ring 501 is connected to the bottom end of the connecting pipe 502, the sealing ring 501 is in contact with the inlet pipe 3, thus preventing water leakage from this point. Furthermore, because the connecting pipe 502 is welded to the limiting pin 503, the limiting pin 503 is aligned with the inlet pipe 3, thereby limiting the connection of the connecting pipe 502.

[0045] Next, rotate the pressing part 5051 of the fixing plate 505 to a position directly above the flange 5021 of the connecting pipe. Then move the limiting member 507 towards the water inlet pipe 3, so that the limiting member 507 is inserted into the limiting groove, preventing the fixing plate 505 from rotating horizontally. Manually rotate the threaded rod 506. Since the threaded rod 506 is threadedly connected to the fixing plate 505, the rotation of the threaded rod 506 causes the fixing plate 505 to move downward along the limiting member 507 until the fixing plate 505 drives the fixing pin 504 to connect with the connecting pipe 502, thus fixing the connecting pipe 502 and preventing it from moving freely. This eliminates the need to repeatedly rotate multiple sets of bolts to complete the installation of the connecting pipe 502, saving time and effort. Therefore, it facilitates pipe connection when the heat recovery unit is in use.

[0046] The process of cleaning the outer wall of the transparent observation window 7 of the aforementioned heat recovery unit is as follows:

[0047] As the heat recovery unit ages, to ensure its stability during operation, a transparent observation window 7 is needed to facilitate external observation of the unit's internal workings, allowing workers to promptly identify any problems. When dirt adheres to the outer wall of the transparent observation window 7 and obstructs viewing, the guide plate 604 can be manually moved, sliding along the guide rod 603. Since the guide plate 604 is connected to the cleaning sponge 606, its movement causes the sponge to move as well. This movement rubs against the outer wall of the transparent observation window 7, cleaning away the dirt and preventing it from obstructing the worker's view of the heat recovery unit's interior.

[0048] After the outer wall of the transparent observation window 7 is cleaned, the magnet 605 is made to fit against the iron fixing seat. At this time, the iron fixing seat and the magnet 605 are magnetically connected, which limits the guide plate 604 and prevents the guide plate 604 from moving at will.

[0049] In summary, when using this heat recovery device that is easy to connect to pipes, water is first introduced into the body 1 of the recovery device through the water inlet pipe 3, and then flue gas is passed through the body 1 of the recovery device through the air inlet pipe 2. At this time, the heat in the flue gas is absorbed by the water in the body 1 of the recovery device, thereby increasing the temperature of the water. Then, the hot water is discharged from the body 1 of the recovery device through the water outlet pipe 4, thus recovering the heat.

[0050] Example 2

[0051] This embodiment provides a heat recovery device. Based on embodiment 1, this embodiment improves the control of the threaded rod 506 to electric control.

[0052] A miniature stepper motor is installed at the top of the threaded rod 506, which can be started with a single button via wireless remote control or control panel. The motor drives the threaded rod to rotate, causing the fixing plate 505 to move up and down, automatically locking or loosening the connecting pipe 502. A pressure sensor is added inside the sealing ring 501 to monitor the sealing status in real time. When the pressure reaches a preset threshold, the motor automatically stops to ensure sealing and prevent over-tightening. This completely eliminates the tediousness of manual operation and improves installation efficiency.

[0053] An electromagnet is installed at the position corresponding to the limiting component and the limiting groove. The sliding of the limiting component is electrically controlled. A displacement sensor is installed in the limiting groove to detect whether the fixing plate has reached the third position. Photoelectric switches are placed at both ends of the slide rail to determine whether the limiting component is in the locked / unlocked position.

[0054] The workflow of this embodiment is as follows:

[0055] Pre-docking stage: The operator presses the "unlock" button on the touch screen → the controller drives the limit component electromagnet to de-energize, and the limit component automatically slides out of the limit groove → the motor starts and drives the fixing plate to rotate to the first position.

[0056] Pipe positioning: After the docking pipe is manually placed, the limit pin automatically inserts into the limit hole, and the touch screen displays the "ready" status.

[0057] Automatic locking: Click the "Lock" button → The limit electromagnet is energized and attracted to the locking position → The motor reverses to drive the screw to press down the fixing plate. The pressure sensor provides real-time feedback data. When the preset threshold (e.g., 20MPa) is reached, the system stops → After the displacement sensor confirms that the third position is in place, the system issues a buzzer prompt.

[0058] This embodiment also integrates fault diagnosis function. If the sensor detects an abnormality in the connection (such as pipe misalignment or seal failure), the system will automatically alarm and suspend operation.

[0059] The implementation method is as follows.

[0060] I. Pipeline Deviation Detection:

[0061] Four sets of laser displacement sensors (model: KeyenceIL-300) are evenly distributed around the circumference of the flange mating surface to monitor the flange spacing in real time (accuracy ±0.05mm). A MEMS gyroscope (MPU-6050) is embedded in the limiting groove of the fixed plate 505 to detect the flange plane tilt angle (range ±15°). The MEMS gyroscope measures the X / Y / Z three-axis tilt angle of the fixed plate 505 in real time (sampling rate 100Hz), and the angle data is synchronized with the displacement sensor data with the timestamp to establish a coordinate system mapping relationship.

[0062] 1.1 Synchronous Data Acquisition: The laser sensor group synchronously acquires 4-point spacing data (resolution 0.01mm) every 200ms. The gyroscope continuously outputs X / Y / Z axis tilt angle data at a frequency of 100Hz.

[0063] 1.2 Data Preprocessing: Sliding window mean filtering (window width = 10) was applied to the laser data to eliminate vibration noise; complementary filtering algorithm was used for the gyroscope data, and accelerometer data was fused to correct drift error.

[0064] 1.3 Skew Judgment and Response: Concentricity Detection: Calculate the range ΔL of the four laser ranging values.

[0065] Judgment condition: If ΔL>0.5mm for 3 consecutive sampling cycles → trigger concentricity deviation alarm.

[0066] Tilt angle detection: Calculate the angle θ between the flange plane normal vector and the reference plane. If θ > 3° and lasts for 2 seconds, trigger the tilt alarm.

[0067] II. Seal Failure Detection:

[0068] A thin-film pressure sensor array (FlexiForce A201) is embedded inside the sealing ring 501 to detect the pressure distribution on the sealing surface (range 0-50 N / cm). 2 A capacitive humidity probe (Honeywell HIH-4000) is installed on the outer edge of the flange to monitor leaking water mist (response time < 1s).

[0069] By feeding back the detection information from the thin-film pressure sensor and the capacitive humidity probe to the controller, the controller compares the detection information with the set information to determine whether there is a sealing failure between the inlet pipe flange 301 and the connecting pipe flange 5021.

[0070] Example 3

[0071] This embodiment provides a heat recovery device. Based on Embodiment 1, this embodiment improves the cleaning mechanism 6. An optical sensor is installed on the outer wall of the transparent observation window 7 to detect the dirt coverage area and light transmittance in real time. The original guide plate 604 is replaced with a cleaning arm driven by a miniature linear motor, which incorporates an ultrasonic vibration cleaning sponge. The cleaning program automatically starts when the dirt level exceeds the limit. After cleaning, the magnet 605 is fixed to the iron fixing base by an electromagnetic lock to prevent accidental movement. This embodiment reduces the frequency of manual maintenance, ensures the observation window is always in optimal visibility condition, and is suitable for harsh environments with high dust or high humidity.

[0072] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A pipe fixing mechanism, characterized in that, include: A fixing plate (505) has a pressing part (5051) on one side and a limiting part (5052) on the other side. A limiting groove (5053) is provided on the limiting part (5052). The fixing plate (505) has a first position, a second position, and a third position. When the fixing plate (505) is in the first position, the orthographic projection of the pressing part (5051) of the fixing plate (505) does not fall on the water inlet pipe flange. When the fixing plate (505) is in the second position, the pressing part (5051) of the fixing plate (505) is located directly above the docking pipe flange (5021) and the water inlet pipe flange (301), and there is a gap between the pressing part (5051) and the docking pipe flange (5021). When the fixing plate (505) is in the third position, the fixing plate (505) abuts against the docking pipe flange (5021). A screw assembly, wherein the screw assembly is vertically arranged and threadedly fitted to a fixing plate (505), and the bottom end of the screw assembly is rotatably mounted on the top wall of the heat recovery unit; A limiting component, the limiting component being slidable, the limiting component having a locking position that slides into a limiting groove (5053) and an unlocking position that slides out of the limiting groove (5053); Before the docking pipe is connected to the water inlet pipe, when the limiting component moves to the unlocked position, the screw component rotates and directly drives the fixing plate (505) to rotate, so that the fixing plate (505) moves to the first position to provide clearance space for the installation of the docking pipe; After the connecting pipe is connected to the water inlet pipe, the fixing plate (505) moves to the second position. When the limiting component moves to the locking position, the screw assembly rotates and drives the fixing plate (505) to descend, so that the fixing plate (505) moves to the third position.

2. The pipe fixing mechanism according to claim 1, characterized in that, The limiting component includes: A slide rail (508) is fixedly installed on the top wall of the heat recovery unit, and a slide groove (5081) is provided at the top of the slide rail (508). The limiting component (507) includes a sliding plate (5071) and an L-shaped limiting plate (5072). The sliding plate (5071) is slidably fitted in the sliding groove. The L-shaped limiting plate (5072) has a horizontal plate and a vertical plate. The horizontal plate is connected to the sliding plate (5071), and the vertical plate is adapted to the limiting groove (5053).

3. The pipe fixing mechanism according to claim 1, characterized in that, The screw assembly includes: A threaded rod (506) is threadedly fitted to a fixed plate (505); The bearing housing (509) is fixedly mounted on the top wall of the heat recovery unit, and the bottom end of the threaded rod (506) is rotatably connected to the bearing housing (509). An operating handle is provided at the top of the threaded rod (506).

4. The pipe fixing mechanism according to any one of claims 1-3, characterized in that, The bottom end of the pressing part (5051) of the fixing plate (505) is provided with a fixing pin (504). The fixing pin (504) is adapted to the positioning hole opened at the top of the connecting pipe flange (5021). When the fixing plate (505) is in the third position, the fixing pin (504) is inserted into the positioning hole.

5. The pipe fixing mechanism according to any one of claims 1-3, characterized in that, The pipe fixing mechanism also includes: Multiple limiting pins (503) are fixedly installed at the bottom end of the connecting pipe flange (5021). The top end of the water inlet pipe flange (301) is provided with multiple limiting holes corresponding to the positions of the limiting pins (503). The limiting pins (503) are adapted to the limiting holes.

6. A heat recovery device, characterized in that, include: The main body of the recycler (1) has a water storage cavity inside. The top of the main body of the recycler (1) is provided with a water inlet pipe (3) that communicates with the water storage cavity. The side of the main body of the recycler (1) is provided with a water outlet pipe (4) that communicates with the water storage cavity. The main body of the recycler (1) is also provided with an air inlet pipe (2). The air inlet pipe (2) passes through the water storage cavity and is not connected to the water storage cavity. At least two pipe fixing mechanisms according to any one of claims 1-5, each of the pipe fixing mechanisms being circumferentially spaced around the water inlet pipe (3), the pipe fixing mechanisms being used to position the docking pipe (502) onto the water inlet pipe (3).

7. The heat recovery device according to claim 6, characterized in that, The top end of the water inlet pipe (3) is connected to a sealing ring (501).

8. The heat recovery device according to claim 6 or 7, characterized in that, The main body (1) of the recycler is provided with a transparent observation window (7) on its wall surface, which allows observation of the condition of the water storage chamber; A cleaning mechanism (6) is provided on the outside of the transparent observation window (7), which is used to clean the outer wall of the transparent observation window (7).

9. The heat recovery device according to claim 8, characterized in that, The cleaning mechanism (6) includes: A pair of fixing seats (602) are vertically spaced on the outer wall of the recycler body (1), and the two fixing seats (602) are located on the left and right sides of the transparent observation window (7); A pair of guide rods (603), both guide rods (603) are horizontally arranged between two fixed seats (602), and the two guide rods (603) are located on the upper and lower sides of the transparent observation window (7); A guide plate (604) is slidably mounted on two guide rods (603). The guide plate (604) is arranged vertically and has a gap between it and the transparent observation window (7). A cleaning sponge (606) is placed on the side wall of the guide plate (604) facing the transparent observation window (7), and the outer wall of the cleaning sponge (606) is in contact with the outer wall of the transparent observation window (7).

10. The heat recovery device according to claim 9, characterized in that, The fixed base (602) is an iron fixed base; the top and / or bottom of the guide plate (604) are provided with magnets (605); when the guide plate (604) moves to a position that contacts the fixed base (602), the magnets (605) attract the fixed base (602) to lock the guide plate (604) onto the fixed base (602).

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