Waste heat recovery heat pump unit

Abstract

The invention relates to the technical field of heat pumps, and discloses a waste heat recovery heat pump unit which comprises a grating frame, a heat pump unit body arranged in an inner cavity of the grating frame and an electric control box arranged on one side of the grating frame. Defrosting components are arranged on the front face and the back face of the evaporator and comprise first driving assemblies arranged on the side, close to the heat pump unit body, of the electric control box and frost scraping assemblies arranged on the tops of the first driving assemblies. When the surface of the evaporator needs to be defrosted, a stepping motor is started to drive a driving gear to rotate, so that the driving gear drives a driven rack to move downwards, a long connecting plate and a short connecting plate synchronously move downwards, and a first pulley slides in a limiting sliding rail under the limiting action of the limiting sliding rail; the first pulley drives the scraper to scrape off frost on the evaporator fins, the heating effect of the heat pump unit is not affected, and continuous and normal heating of the heat pump unit is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a waste heat recovery heat pump unit. Background Art

[0002] In industrial production processes, such as steel, chemical, pulp and paper industries, a large amount of heat energy is lost to the environment in the form of waste heat, resulting in energy waste and environmental burden. Driven by high-level energy (generally electricity, thermal energy), heat pump units transfer heat energy from low-level heat sources (usually air or water) to energy-saving devices with high-level heat sources, thereby achieving the goals of waste heat recovery and energy conservation and emission reduction.

[0003] In the process of waste heat recovery of the heat pump unit, the evaporator is the key component that converts the refrigerant from liquid to gas. When the refrigerant evaporates in the evaporator, it absorbs heat from the surrounding air, thereby reducing the surface temperature of the evaporator. When operating in winter in most areas or in cold northern regions, the surface of the outdoor evaporator is very easy to frost, and as the frost layer grows, the heat transfer thermal resistance of the evaporator fins gradually increases, resulting in a decrease in its heat transfer coefficient and a decrease in the unit's performance coefficient, and even endangering the entire heat exchange system.

[0004] At present, defrosting is usually carried out by reverse cycle, hot gas bypass defrosting, and four-way valve hot and cold conversion. During this process, the heating effect of the heat pump unit will be temporarily interrupted, and normal heating will not be possible, which will cause the temperature of the hot water after circulation to fluctuate; and when the defrost water drips directly onto other components inside the unit, it will cause local cooling, reducing the heating efficiency of the heat pump unit. Long-term accumulation of moisture will cause corrosion, mold growth and other problems. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] The present application provides a waste heat recovery heat pump unit, the purpose of which is to solve the problem in the prior art that the heating effect of the waste heat recovery heat pump unit is temporarily interrupted during defrosting, normal heating cannot be provided, and the defrost water directly drips onto other components inside the unit and cannot be discharged in a centralized manner.

[0007] The technical solution of the present invention is: a waste heat recovery heat pump unit, comprising a grille frame, a heat pump unit body arranged in the inner cavity of the grille frame, and an electric control box arranged on one side of the grille frame, the heat pump unit body comprising an evaporator arranged on the top of the grille frame, and the front and back sides of the evaporator are both provided with a defrosting component, the defrosting component comprising a first driving component arranged on one side of the electric control box close to the heat pump unit body, a frost scraping component arranged on the top of the first driving component, and a guide component arranged on one side of the frost scraping component; The first driving assembly includes a stepper motor arranged on one side of the electric control box close to the main body of the heat pump unit, a driving gear arranged at the output end of the stepper motor, a driven rack arranged on the back of the driving gear, and the driving gear is meshed with the driven rack, a limiting slide rail arranged on both sides of the evaporator, a connecting long plate arranged on the top of the driven rack, a connecting short plate arranged at both ends of the connecting long plate, and a first pulley arranged between the connecting short plate and the limiting slide rail; The limiting slide rail is connected to the outer wall of the evaporator, and the path of the limiting slide rail is parallel to the fin surface of the evaporator; The frost scraping assembly comprises a scraper arranged between the connecting long plate and the evaporator fin surface.

[0008] By adopting the above technical solution, when it is necessary to defrost the surface of the evaporator, the stepper motor is turned on to drive the driving gear to rotate, so that the driving gear drives the driven rack to move downward, and the connecting long plate and the connecting short plate move downward synchronously. Under the limiting action of the limiting slide rail, the first pulley slides in the limiting slide rail, so that the first pulley drives the scraper to scrape off the frost on the evaporator fins.

[0009] Furthermore, when the scraper is not in operation, the distance between the scraper and the evaporator fin surface is at least 1 cm, and an arc plate is provided on the outer wall of the scraper.

[0010] When adopting the above technical solution, there is a gap between the scraper and the evaporator fin surface when not working to prevent the scraper from sticking to the fin surface. Frost may cover both the scraper and the fin surface for a long time, affecting the subsequent defrosting effect of the scraper. By setting an arc plate, the scraper can easily collect the frost after scraping and defrosting.

[0011] Furthermore, the frosting scraper assembly also includes connecting ears arranged at both ends of the scraper, and a first connecting member arranged between one of the connecting ears and one of the connecting short plates, the first connecting member cooperates with the rotating shaft to connect one of the connecting ears and one of the connecting short plates, and the first connecting member is in a "Z" shape.

[0012] Furthermore, the frosting scraper assembly also includes a second connecting member arranged between the other connecting ear and the other connecting short plate, and the second connecting member cooperates with the rotating shaft to connect the other connecting ear and the other connecting short plate.

[0013] Furthermore, the guide assembly includes a guide plate arranged on one side of the second connecting member, and the guide plate is connected to the outer wall of the evaporator, a first inclined section is opened on the guide plate, and a second vertical section is opened at the bottom of the first inclined section, and the first inclined section is connected to the second vertical section.

[0014] Furthermore, the guide assembly also includes a second pulley arranged in the first inclined section, and a connecting rod movably penetrating the inner cavity of the second pulley, and one end of the connecting rod is connected to the rotating shaft in the other connecting ear.

[0015] By adopting the above technical solution, when the connecting short plate moves downward, the second connecting member first drives the second pulley to move to the tail end of the first inclined section through the connecting action of the connecting rod, and then drives the second pulley to move to the tail end of the second vertical section; in the process of the second pulley to the tail end of the first inclined section, the scraper moves forward a distance and fits the fin surface of the evaporator through the connection between the connecting ear and the connecting rod.

[0016] Furthermore, a defrost component is provided at the bottom of the defrost component, and the defrost component includes a collection frame arranged at the bottom of the scraper, and a second drive assembly arranged on the side of the collection frame close to the electric control box. The collection frame is installed on the inner wall of the grille frame by screws and bolts.

[0017] By adopting the above technical solution, the frost scraped off by the scraper falls into the collection frame, so that the melted frost can be further recycled.

[0018] Furthermore, the second driving assembly includes a driving wheel arranged at the output end of the stepper motor, a rotating rod arranged on the wall of the collection frame through a bearing, a driven wheel arranged at one end of the rotating rod, and a transmission belt arranged between the driving wheel and the driven wheel.

[0019] By adopting the above technical solution, when the stepping motor drives the driving gear to rotate, it also drives the driving wheel to rotate. Under the transmission action of the transmission belt, the driving wheel drives the driven wheel to rotate, and the rotating rod rotates synchronously therewith.

[0020] Furthermore, the defrosting component also includes an inclined plate arranged in the inner cavity of the collection frame, a shaft arranged at the other end of the rotating rod, spiral blades arranged on the surface of the shaft, and a drainage pipe arranged at the bottom of the collection frame.

[0021] By adopting the above technical solution, the scraped frost rolls along the inclined plate to the bottom of the inner cavity of the collection frame, and the rotating rod drives the shaft and the spiral blades to rotate. The rotation of the spiral blades converts the frost into finer particles, accelerates its melting, and transports it into the drain pipe.

[0022] Furthermore, the two drain pipes are connected, and an extension pipe is provided at the connection of the two drain pipes, one end of the extension pipe away from the drain pipe extends out of the grille frame, and a water receiving bucket is provided at the bottom of the end of the extension pipe away from the drain pipe.

[0023] By adopting the above technical solution, the melted frost water passes through the drain pipe and the extension pipe, and is finally discharged into the water receiving bucket or the water circulation system of the heat pump unit. The frost water can be used for other purposes, such as irrigation, cooling system or reused as a water replenishment source for the heat pump unit, which can save fresh water resources and reduce dependence on external water sources.

[0024] Beneficial effects of the present invention: 1. When it is necessary to defrost the surface of the evaporator, the stepper motor is turned on to drive the driving gear to rotate, so that the driving gear drives the driven rack to move downward, and the connecting long plate and the connecting short plate move downward synchronously. Under the limiting action of the limiting slide rail, the first pulley slides in the limiting slide rail, so that the first pulley drives the scraper to scrape off the frost on the evaporator fins, which does not affect the heating effect of the heat pump unit and facilitates the continuous and normal heating of the heat pump unit.

[0025] 2. When the connecting short plate moves downward, the second connecting member drives the second pulley to move to the tail end of the first inclined section through the connecting action of the connecting rod, and then drives the second pulley to move to the tail end of the second vertical section; in the process of the second pulley to the tail end of the first inclined section, the scraper is moved forward for a section to fit with the fin surface of the evaporator through the connection of the connecting ear and the connecting rod, so as to avoid the scraper being easily frozen by the frost on the fin surface of the evaporator for a long time, so that the stepper motor may encounter a higher starting resistance when starting, which increases the power consumption of the stepper motor, and avoids the scraper from covering the fin when defrosting is not needed, thereby affecting the heat exchange efficiency of the evaporator.

[0026] 3. The stepper motor drives the driving gear and the driving wheel to rotate synchronously. Under the transmission action of the transmission belt, the rotating rod rotates synchronously. The scraped frost rolls along the inclined plate to the bottom of the inner cavity of the collection frame. The rotating rod drives the shaft and the spiral blades to rotate. The rotation of the spiral blades converts the frost into finer particles, accelerates its melting, and transports it into the drain pipe.

[0027] 4. The melted frost water passes through the drain pipe and extension pipe, and is finally discharged into the water receiving bucket or the water circulation system of the heat pump unit. The frost water can be used for other purposes, such as irrigation, cooling system or reused as a water source for the heat pump unit, which can save fresh water resources and reduce dependence on external water sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic structural diagram of the heat pump and the main body of the present invention; Figure 3 is a schematic structural diagram of a first driving assembly of the present invention; Figure 4 For the present invention Figure 3The enlarged schematic diagram at A in the middle; Figure 5 It is a schematic structural diagram of the position-limiting slide rail of the present invention; Figure 6 It is a schematic structural diagram of the scraper of the present invention; Figure 7 For the present invention Figure 3 The enlarged schematic diagram of point B in the middle; Figure 8 is a schematic structural diagram of a first connecting member of the present invention; Fig. 9 It is a schematic structural diagram of the first oblique section and the second vertical section of the present invention; Fig.10 It is a schematic structural diagram of the second driving assembly of the present invention.

[0029] In the figure: 1. Grid frame; 2. Heat pump unit body; 3. Electric control box; 4. Evaporator; 5. Defrosting component; 51. First driving assembly; 511. Stepping motor; 512. Driving gear; 513. Driven rack; 514. Limiting slide rail; 515. Connecting long board; 516. Connecting short board; 517. First pulley; 52. Frost scraping assembly; 521. Scraper; 522. Arc board; 523. Connecting ear; 524. First connecting piece; 525, second connecting member; 53, guide assembly; 531, guide plate; 532, first oblique section; 533, second vertical section; 534, second pulley; 535, connecting rod; 6, defrost component; 61, collecting frame; 62, second driving assembly; 621, driving wheel; 622, rotating rod; 623, driven wheel; 624, belt; 63, oblique plate; 64, shaft; 65, spiral blade; 66, drain pipe; 7, extension pipe. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] Example 1 Reference Figure 1-9 , which is the first embodiment of the present invention, provides a waste heat recovery heat pump unit, including a grid frame 1, a heat pump unit body 2 installed in the inner cavity of the grid frame 1, and an electric control box 3 installed on one side of the grid frame 1, the heat pump unit body 2 includes an evaporator 4 installed on the top of the grid frame 1, and the front and back sides of the evaporator 4 are both installed with a defrosting component 5, the defrosting component 5 includes a first driving component 51 installed on the side of the electric control box 3 close to the heat pump unit body 2, a frost scraping component 52 installed on the top of the first driving component 51, and a guide component 53 installed on one side of the frost scraping component 52; The first driving assembly 51 includes a stepping motor 511 installed on the side of the electric control box 3 close to the heat pump unit body 2, a driving gear 512 installed at the output end of the stepping motor 511, a driven rack 513 located at the back of the driving gear 512, and the driving gear 512 is meshed with the driven rack 513, a limiting slide rail 514 connected to both sides of the evaporator 4, a connecting long plate 515 connected to the top of the driven rack 513, a connecting short plate 516 connected to both ends of the connecting long plate 515, and a first pulley 517 installed between the connecting short plate 516 and the limiting slide rail 514; The limiting slide rail 514 is connected to the outer wall of the evaporator 4, and the path of the limiting slide rail 514 is parallel to the fin surface of the evaporator 4; The frost scraping assembly 52 includes a scraper 521 located between the connecting long plate 515 and the fin surface of the evaporator 4 .

[0032] Specifically, when it is necessary to defrost the surface of the evaporator 4, the stepper motor 511 is turned on to drive the driving gear 512 to rotate, so that the driving gear 512 drives the driven rack 513 to move downward, and the connecting long plate 515 and the connecting short plate 516 move downward synchronously. Under the limiting action of the limiting slide rail 514, the first pulley 517 slides in the limiting slide rail 514, so that the first pulley 517 drives the scraper 521 to scrape off the frost on the evaporator fins.

[0033] Reference Figure 4 and Figure 6 When not in operation, the distance between the scraper 521 and the fin surface of the evaporator 4 is at least 1 cm, and an arc plate 522 is connected to the outer wall of the scraper 521.

[0034] Specifically, when not working, there is a gap between the scraper 521 and the fin surface of the evaporator 4 to prevent the scraper 521 from sticking to the fin surface. Over a long period of time, frost may cover both the scraper 521 and the fin surface, affecting the subsequent defrosting effect of the scraper 521. By setting the arc plate 522, it is convenient for the scraper 521 to collect frost after scraping and defrosting.

[0035] Reference Figure 4 and Figure 7 The frosting scraper assembly 52 also includes connecting ears 523 connected at both ends of the scraper plate 521, and a first connecting member 524 rotatably connected between one of the connecting ears 523 and one of the connecting short plates 516, the first connecting member 524 cooperates with the rotating shaft to connect one of the connecting ears 523 and one of the connecting short plates 516, and the first connecting member 524 is in a "Z" shape; the frosting scraper assembly 52 also includes a second connecting member 525 rotatably connected between another connecting ear 523 and another connecting short plate 516, the second connecting member 525 cooperates with the rotating shaft to connect another connecting ear 523 and another connecting short plate 516.

[0036] Reference Figure 8 and Fig. 9 The guide assembly 53 includes a guide plate 531 located on one side of the second connecting member 525, and the guide plate 531 is connected to the outer wall of the evaporator 4, a first inclined section 532 is provided on the guide plate 531, and a second vertical section 533 is provided at the bottom of the first inclined section 532, and the first inclined section 532 is communicated with the second vertical section 533; the guide assembly 53 also includes a second pulley 534 slidably connected to the first inclined section 532, and a connecting rod 535 movably inserted into the inner cavity of the second pulley 534, and one end of the connecting rod 535 is connected to the rotating shaft in the other connecting ear 523.

[0037] Specifically, when the connecting short plate 516 moves downward, the second connecting member 525, through the connecting action of the connecting rod 535, first drives the second pulley 534 to move to the tail end of the first inclined section 532, and then drives the second pulley 534 to move to the tail end of the second vertical section 533; in the process of the second pulley 534 to the tail end of the first inclined section 532, through the connection between the connecting ear 523 and the connecting rod 535, the scraper 521 moves forward a distance to fit the fin surface of the evaporator 4.

[0038] Example 2 Reference Figure 3 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that the electric control box 3 adopts the electric control box 3 for heat pump units in the prior art. The specific structural composition and working principle are not particularly limited herein. As long as the basic electric control operations such as program control and signal reception and transmission can be completed, the stepper motor 511 is electrically connected to the electric control box 3. The electric control box 3 needs to be connected to an external power supply to provide power. The electric control box 3 includes a control module and a communication module.

[0039] Specifically, there can be multiple ways of connecting the electric control box 3 and the stepper motor 511, depending on the design and interface type of the electric control box 3 and the stepper motor 511. It can be a parallel connection: in the parallel connection mode, each coil of the stepper motor 511 is connected to the corresponding output port of the electric control box 3, and this connection mode can be achieved through a plug, a connector or direct welding; it can also be a terminal connection: the electric control box 3 and the stepper motor 511 can be connected using terminal blocks, and this connection mode is convenient for maintenance and replacement of the stepper motor 511.

[0040] Specifically, a program is written in the electric control box 3 and transmitted to the stepper motor 511 through the communication module. These instructions may be predefined commands for controlling the action, parameter setting, etc. of the stepper motor 511. The instructions are usually transmitted through a communication protocol between the electric control box 3 and the stepper motor 511, such as SPI, I2C, UART, etc. The instructions in the program can realize various motion modes of controlling the stepper motor 511, such as rotation, positioning, acceleration / deceleration, counterclockwise / clockwise rotation, etc. By continuously updating the drive signal, continuous motion or positioning motion of the stepper motor 511 can be realized.

[0041] Example 3 Reference Figure 1-10 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that a defrost component 6 is installed at the bottom of the defrost component 5, and the defrost component 6 includes a collecting frame 61 located at the bottom of the scraper 521, and a second driving component 62 installed on the side of the collecting frame 61 close to the electric control box 3. The collecting frame 61 is installed on the inner wall of the grid frame 1 by screws and bolts.

[0042] Specifically, the frost scraped off by the scraper 521 falls into the collection frame 61, so that the melted frost can be further recycled.

[0043] Reference Fig.10 The second driving assembly 62 includes a driving wheel 621 installed at the output end of the stepping motor 511, a rotating rod 622 rotatably connected to the wall of the collecting frame 61 through a bearing, a driven wheel 623 installed at one end of the rotating rod 622, and a transmission belt 624 sleeved between the driving wheel 621 and the driven wheel 623.

[0044] Specifically, when the stepping motor 511 drives the driving gear 512 to rotate, it also drives the driving wheel 621 to rotate. Under the transmission action of the transmission belt 624, the driving wheel 621 drives the driven wheel 623 to rotate, and the rotating rod 622 rotates synchronously therewith.

[0045] Reference Fig.10 The defrosting component 6 also includes an inclined plate 63 arranged in the inner cavity of the collecting frame 61, an axle rod 64 connected to the other end of the rotating rod 622, and the axle rod 64 is located in the inner cavity of the collecting frame 61, a spiral blade 65 connected to the surface of the axle rod 64, and a drain pipe 66 connected to the bottom of the collecting frame 61; the two drain pipes 66 are connected to each other, and an extension pipe 7 is connected to the connection between the two drain pipes 66, and one end of the extension pipe 7 away from the drain pipe 66 extends out of the grille frame 1, and a water receiving bucket is placed at the bottom of the end of the extension pipe 7 away from the drain pipe 66.

[0046] Specifically, the scraped frost rolls along the inclined plate 63 to the bottom of the inner cavity of the collecting frame 61, and the rotating rod 622 drives the shaft 64 and the spiral blade 65 to rotate. The rotation of the spiral blade 65 causes the frost to be converted into finer particles, accelerating its melting, and transporting it into the drain pipe 66; the melted frost water passes through the drain pipe 66 and the extension pipe 7, and is finally discharged into the water receiving bucket or the water circulation system of the heat pump unit. The frost water can be used for other purposes, such as irrigation, cooling system or reused as a water replenishment source for the heat pump unit, which can save fresh water resources and reduce dependence on external water sources.

[0047] Based on Examples 1-3, the working principle of the present invention is as follows: S1: When the fin surface of the evaporator 4 needs to be defrosted, the predefined command of the electric control box 3 causes the stepper motor 511 to drive the driving gear 512 to rotate, and the driving gear 512 drives the driven rack 513 to move downward, and the connecting long plate 515 and the connecting short plate 516 move downward synchronously.

[0048] S2: Under the limiting action of the limiting slide rail 514, the first pulley 517 slides in the limiting slide rail 514; when the connecting short plate 516 moves downward, the second connecting member 525 drives the second pulley 534 to move to the tail end of the first inclined section 532 through the connecting action of the connecting rod 535, and then drives the second pulley 534 to move to the tail end of the second vertical section 533.

[0049] S3: During the process of the second pulley 534 to the tail end of the first inclined section 532, the scraper 521 is moved forward for a distance to fit with the fin surface of the evaporator 4 through the connection between the connecting ear 523 and the connecting rod 535. The scraper 521 moves downward along the fin surface of the evaporator 4 to scrape the frost on its surface onto the inclined plate 63.

[0050] S4: The scraped frost rolls along the inclined plate 63 to the bottom of the inner cavity of the collecting frame 61. When the stepping motor 511 drives the driving gear 512 to rotate, it also drives the driving wheel 621 to rotate, and the rotating rod 622 rotates synchronously therewith.

[0051] S5: The rotating rod 622 drives the shaft 64 and the spiral blade 65 to rotate. The rotation of the spiral blade 65 converts the frost into finer particles, accelerating its melting. The melted frost water passes through the drain pipe 66 and the extension pipe 7, and is finally discharged into the water receiving bucket or the water circulation system of the heat pump unit.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A waste heat recovery heat pump unit, comprising a grid frame (1), a heat pump unit body (2) arranged in the inner cavity of the grid frame (1), and an electric control box (3) arranged on one side of the grid frame (1), characterized in that: The heat pump unit body (2) comprises an evaporator (4) arranged on the top of the grid frame (1), and a defrosting component (5) is arranged on the front and back of the evaporator (4), and the defrosting component (5) comprises a first driving component (51) arranged on the side of the electric control box (3) close to the heat pump unit body (2), a frost scraping component (52) arranged on the top of the first driving component (51), and a guide component (53) arranged on one side of the frost scraping component (52); The first driving component (51) comprises a stepping motor (511) arranged on a side of the electric control box (3) close to the heat pump unit body (2), a driving gear (512) arranged at the output end of the stepping motor (511), a driven rack (513) arranged at the back of the driving gear (512), the driving gear (512) meshing with the driven rack (513), limiting slide rails (514) arranged on both sides of the evaporator (4), a connecting long plate (515) arranged at the top of the driven rack (513), connecting short plates (516) arranged at both ends of the connecting long plate (515), and a first pulley (517) arranged between the connecting short plate (516) and the limiting slide rail (514); The limiting slide rail (514) is connected to the outer wall of the evaporator (4), and the path of the limiting slide rail (514) is parallel to the fin surface of the evaporator (4); The frost scraping assembly (52) comprises a scraping plate (521) arranged between the connecting long plate (515) and the fin surface of the evaporator (4).

2. The waste heat recovery heat pump unit according to claim 1, characterized in that: When not in operation, the scraper (521) has a spacing of at least 1 cm from the fin surface of the evaporator (4), and an arc plate (522) is provided on the outer wall of the scraper (521).

3. The waste heat recovery heat pump unit according to claim 2, characterized in that: The frosting scraper assembly (52) further comprises connecting ears (523) arranged at both ends of the scraper plate (521), and a first connecting member (524) arranged between one of the connecting ears (523) and one of the connecting short plates (516), wherein the first connecting member (524) cooperates with the rotating shaft to connect one of the connecting ears (523) and one of the connecting short plates (516), and the first connecting member (524) is in a "Z" shape.

4. The waste heat recovery heat pump unit according to claim 3, characterized in that: The frosting scraper assembly (52) further comprises a second connecting member (525) arranged between the other connecting ear (523) and the other connecting short plate (516), wherein the second connecting member (525) cooperates with the rotating shaft to connect the other connecting ear (523) and the other connecting short plate (516).

5. The waste heat recovery heat pump unit according to claim 4, characterized in that: The guide assembly (53) comprises a guide plate (531) arranged on one side of the second connecting member (525), the guide plate (531) being connected to the outer wall of the evaporator (4), a first inclined section (532) provided on the guide plate (531), and a second vertical section (533) provided at the bottom of the first inclined section (532), and the first inclined section (532) and the second vertical section (533) being in communication.

6. The waste heat recovery heat pump unit according to claim 5, characterized in that: The guide assembly (53) further comprises a second pulley (534) arranged in the first inclined section (532), and a connecting rod (535) movably penetrating the inner cavity of the second pulley (534), and one end of the connecting rod (535) is connected to a rotating shaft in another connecting ear (523).

7. The waste heat recovery heat pump unit according to claim 6, characterized in that: A defrosting component (6) is arranged at the bottom of the defrosting component (5), and the defrosting component (6) comprises a collecting frame (61) arranged at the bottom of the scraper (521), and a second driving assembly (62) arranged on a side of the collecting frame (61) close to the electric control box (3), and the collecting frame (61) is mounted on the inner wall of the grille frame (1) by means of screws and bolts.

8. The waste heat recovery heat pump unit according to claim 7, characterized in that: The second driving assembly (62) comprises a driving wheel (621) arranged at the output end of the stepping motor (511), a rotating rod (622) arranged on the wall of the collection frame (61) via a bearing, a driven wheel (623) arranged at one end of the rotating rod (622), and a transmission belt (624) arranged between the driving wheel (621) and the driven wheel (623).

9. The waste heat recovery heat pump unit according to claim 8, characterized in that: The defrosting component (6) further comprises an inclined plate (63) arranged in the inner cavity of the collection frame (61), a shaft (64) arranged at the other end of the rotating rod (622), a spiral blade (65) arranged on the surface of the shaft (64), and a drainage pipe (66) arranged at the bottom of the collection frame (61).

10. The waste heat recovery heat pump unit according to claim 9, characterized in that: The two drainage pipes (66) are connected, and an extension pipe (7) is provided at the connection between the two drainage pipes (66); one end of the extension pipe (7) away from the drainage pipe (66) extends out of the grille frame (1), and a water receiving bucket is provided at the bottom of the end of the extension pipe (7) away from the drainage pipe (66).

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