An air source heat pump unit capable of providing frost protection

Abstract

The present invention discloses an air source heat pump unit which can provide anti-frost treatment, and relates to the technical field of anti-frost treatment for pump units, comprising a protective shell, wherein grids are fixedly connected to the top of the protective shell on all four sides, and an evaporator is fixedly connected to the top inner surface of the protective shell, and further comprises: a reciprocating flipping mechanism, through the setting of the reciprocating flipping mechanism, a reciprocating screw rod and an L-shaped long plate are adopted, so that a defrost rod can not only reciprocate on the surface of the evaporator, but also be limited and flipped by a rack plate and a rotary groove at a turning point, so as to achieve double-sided heating and defrosting, and the defrost rod does not fit the evaporator, so as to avoid wear on the surface of the evaporator, and the frost on the surface of the evaporator is melted by the heat of the heating wire, and the mobile defrosting method replaces the traditional fixed heat source heating, so that the heat distribution can be controlled more accurately, and the local overheating or uneven heating which may occur in the traditional fixed heat source heating is avoided, thereby saving energy.

Description

Technical Field

[0001] The invention relates to the technical field of anti-frost treatment for pump units, and in particular to an air source heat pump unit capable of providing anti-frost treatment. Background Art

[0002] Air source heat pump unit is a kind of equipment that uses air as a low-temperature heat source and converts low-grade heat energy in the air into high-grade heat energy through the work of the compressor. It has the advantages of energy saving, environmental protection, and low operating cost. Among them, the evaporator is one of the core components of the air source heat pump. It realizes cooling or heating by absorbing heat from the surrounding air. In a low temperature environment, the surface of the evaporator is prone to frost, which will reduce the efficiency of the heat pump. In severe cases, it may even cause the heat pump to stop working;

[0003] In the prior art, the main methods of anti-frost treatment include electric heating defrosting, hot gas bypass defrosting, heat pump assisted defrosting and automatic defrost control system, among which the principle of electric heating defrosting is to lay heating lines on the inner surface of the evaporator, start these lines in cold weather, and make the lines emit heat to eliminate frost. However, this method has limitations in flexibility and uniformity. First, since the layout of the heating lines is usually fixed, its flexibility is limited when applied to equipment of different shapes and sizes, and it is difficult to adapt to various complex environments. Secondly, the uniformity of defrosting is also limited because the distribution of frost on the surface of the evaporator may be uneven, and the heating effect of the heating lines may vary depending on the distance, position and thermal conductivity characteristics of the equipment, resulting in poor defrosting effect in some areas, while other areas may be overheated, affecting the normal operation of the equipment or increasing energy consumption;

[0004] In addition, during the electric heating defrosting process, it is usually necessary to continuously heat the circuit to ensure that the frost can melt in time and avoid the occurrence of ice. Once the frost melts, the melted water will form water stains. If not removed in time, the water stains will accumulate on the surface of the evaporator, causing frost to form again. This process not only consumes a lot of energy and increases operating costs, but also runs counter to the concept of energy conservation and emission reduction. Secondly, frequent heating and cooling cycles may also accelerate the aging of the equipment and reduce its service life, and may also affect the energy efficiency performance of the equipment.

[0005] In view of this, the present invention proposes an air source heat pump unit that can provide anti-frost treatment to compensate for and improve the deficiencies of the prior art. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an air source heat pump unit that can more accurately control heat distribution and thus save energy; can reduce the complexity and error rate of operation; can improve the reusability of the device and increase the energy efficiency performance of the equipment and can provide anti-frost treatment, so as to solve the corresponding technical problems raised in the above background technology.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: an air source heat pump unit that can provide anti-frost treatment, including a protective shell, the top of the protective shell is fixedly connected to a grid around the periphery, the top inner surface of the protective shell is fixedly connected to an evaporator, and also includes:

[0008] A reciprocating flip mechanism is used to reciprocate and heat the outer surface of the evaporator to remove frost, and flip it for replacement;

[0009] The scraping and drying mechanism is used to scrape and collect the water melted from the frost on the surface of the evaporator and assist in drying.

[0010] Preferably, the reciprocating flipping mechanism includes a double-headed motor fixedly connected to the top edge of the protective shell, the output ends on both sides of the double-headed motor are fixedly connected to a rotating shaft, the two rotating shafts are fixedly connected to a main bevel gear on the sides away from each other, the outer walls of the two main bevel gears are meshingly connected to secondary bevel gears, the two secondary bevel gears are fixedly connected to a reciprocating screw on the sides away from the double-headed motor, a pair of fixed plates are fixedly connected at the top corners of the protective shell, the outer walls of the reciprocating screw and the rotating shaft are respectively rotatably connected to the inner wall of the fixed plate, and the side of the reciprocating screw away from the fixed plate is rotatably connected to the inner wall of the protective shell.

[0011] Preferably, the reciprocating flipping mechanism also includes a pair of sliders slidably connected to the inner wall of the top of the protective shell, the middle parts of the pair of sliders are threadedly connected to the outer wall of the reciprocating screw, the bottoms of the sliders are fixedly connected to connecting rods, the outer walls of the two connecting rods are movably sleeved with defrost rods, the outer walls of the tops of the two defrost rods are fixedly connected to flat gears, and the tops of the defrost rods are also fixedly connected to a pair of sliding columns, and the sliding columns are arranged below the flat gears.

[0012] Preferably, the reciprocating flipping mechanism also includes an L-shaped long plate fixedly connected to both sides of the top of the protective shell, the outer wall of the L-shaped long plate fits with the outer wall of the flat gear, a rotating groove is opened at the bottom of the L-shaped long plate, the outer wall of the sliding column is slidably connected in the rotating groove, one side of the rotating groove is set as a straight groove, and the other side of the rotating groove is set as a bending groove, a telescopic block is slidably connected to the side of the rotating groove close to the bending groove, a return spring is fixedly connected to the side of the telescopic block away from the flat gear, and one end of the return spring away from the telescopic block is fixedly connected to the inner wall of the L-shaped long plate, and a rack plate is fixedly connected to the top of the L-shaped long plate close to the bending groove.

[0013] Preferably, the scraping and drying mechanism includes a vertical scraper fixedly connected to the outer wall of the defrost rod, a baffle fixedly connected to the bottom of the vertical scraper, silicone scrapers fixedly connected to both side edges of the vertical scraper, and sponge pads fixedly connected to the sides where the two silicone scrapers are close to each other.

[0014] Preferably, the scraping and drying mechanism also includes a heater fixedly connected to the bottom of the defrost rod, and electric heating wires are fixedly connected on both sides of the heater. Two groups of the electric heating wires are connected in series in a circle and are evenly laid on the outer wall of the defrost rod. The electric heating wires are electrically connected to the heater, and a slide box is fixedly connected to the bottom of the evaporator, and the bottom of the defrost rod is slidably connected to the inner wall of the slide box.

[0015] Preferably, the cross section of the vertical scraper is arc-shaped and the concave part of the arc surface is arranged toward the defrost rod.

[0016] Preferably, the side of the telescopic block close to the sliding column is inclined relative to the L-shaped long plate, and the inclined surface of the telescopic block is arranged from high to low in the direction from the straight groove to the bending groove of the rotary groove.

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

[0018] 1. Through the setting of the reciprocating flip mechanism, the reciprocating screw rod and the L-shaped long plate, the defrost rod can not only reciprocate on the surface of the evaporator, but also be limited and flipped by the rack plate and the rotary groove at the turning point, and defrost is performed by heating on both sides. The defrost rod does not fit the evaporator to avoid wear on the evaporator surface, and the frost on the evaporator surface is melted by the heat of the electric heating wire. The mobile defrosting method replaces the traditional fixed heat source heating, which can more accurately control the heat distribution and avoid the local overheating or uneven heating that may occur during the traditional fixed heat source heating, thereby saving energy. The heating area and intensity can also be adjusted according to actual needs to adapt to changes in different environments and conditions, providing a more flexible defrosting solution;

[0019] 2. Through the setting of the telescopic block, since the side of the telescopic block close to the sliding column is inclined relative to the L-shaped long plate, and the inclined surface of the telescopic block is set from high to low from the straight groove of the rotary groove to the bending groove, when the sliding column moves toward the bending groove, it abuts against the high side of the telescopic block, and the sliding column is squeezed by the telescopic block to slide upward into the bending groove. When the sliding column moves in the reverse rotation, it is squeezed through the low side of the telescopic block, so that the sliding column slides into the straight groove of the rotary groove, thereby improving the smoothness and efficiency of the sliding column movement, reducing the resistance and energy loss during the movement, improving the overall efficiency of the mechanical system, and making the movement and positioning operation of the sliding column easier, reducing the complexity and error rate of the operation;

[0020] 3. Through the setting of the scraping and drying mechanism, since the vertical scraper is in an arc shape and the concave part of the arc surface is set in the direction of the defrost rod, the silicone scraper head can better concentrate the stress to scrape off water stains and improve durability. The heating wire is connected in series in a circle and evenly laid on the outer wall of the defrost rod. Not only can the heat of the heating wire be released evenly along the defrost rod, but also before and after the defrost rod is flipped, the heating wire on one side can always release heat to defrost the evaporator surface, while the heating wire on the other side releases heat to assist in drying the sponge pad, so that the sponge pad can still maintain a water-absorbing state when it is flipped next time, thereby improving the reusability of the device, and the operation of the double-headed motor can be stopped after scraping off the water stains, thereby reducing energy consumption and avoiding frequent heating and cooling of the evaporator, thereby increasing the service life and energy efficiency performance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0022] Figure 2 It is a side view stereoscopic structural schematic diagram of the present invention;

[0023] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the reciprocating screw rod connection shown in the present invention;

[0025] Figure 5 The present invention shows Figure 4 The enlarged structural diagram at A in the middle;

[0026] Figure 6 The present invention shows Figure 4 The enlarged structural diagram at B in the middle;

[0027] Figure 7 It is a structural schematic diagram of the L-shaped long plate connection shown in the present invention;

[0028] Figure 8 It is a structural schematic diagram of the rotating shaft connection shown in the present invention.

[0029] The numbers in the figure are:

[0030] 1. Protective shell; 2. Grid; 3. Evaporator;

[0031] 4. Reciprocating turning mechanism; 41. L-shaped long plate; 42. Gear; 43. Defrost rod; 44. Rack plate; 45. Reciprocating screw rod; 46. Double-head motor; 47. Rotating shaft; 48. Fixed plate; 49. Rotating groove; 410. Telescopic block; 411. Sliding column; 412. Sliding block; 413. Reset spring; 414. Connecting rod; 415. Main bevel gear; 416. Sub bevel gear;

[0032] 5. Scraping and drying mechanism; 51. Heater; 52. Heating wire; 53. Vertical scraper; 54. Slide box; 55. Silicone scraper head; 56. Sponge pad; 57. Baffle. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiments of the present invention

[0035] Please refer to Figures 1 to 8 As shown, an air source heat pump unit that can provide anti-frost treatment includes a protective shell 1, a grid 2 is fixedly connected to the top and the periphery of the protective shell 1, an evaporator 3 is fixedly connected to the top inner surface of the protective shell 1, and also includes:

[0036] The reciprocating turning mechanism 4 is used for reciprocatingly heating the outer surface of the evaporator 3 to remove frost, and turning it over for replacement;

[0037] The scraping and drying mechanism 5 is used to scrape and collect the water melted from the frost on the surface of the evaporator 3 and assist in drying;

[0038] The reciprocating flip mechanism 4 includes a double-headed motor 46 fixedly connected to the top edge of the protective shell 1, and the output ends on both sides of the double-headed motor 46 are fixedly connected to the rotating shaft 47, and the two rotating shafts 47 are fixedly connected to the main bevel gears 415 on the sides away from each other, and the outer walls of the two main bevel gears 415 are meshed and connected with the auxiliary bevel gears 416, and the two auxiliary bevel gears 416 are fixedly connected to the reciprocating screw rod 45 on the sides away from the double-headed motor 46. A pair of fixed plates 48 are fixedly connected at the top corners of the protective shell 1, and the outer walls of the reciprocating screw rod 45 and the rotating shaft 47 are respectively rotatably connected to the inner walls of the fixed plates 48, and the side of the reciprocating screw rod 45 away from the fixed plate 48 is rotatably connected to the inner wall of the protective shell 1;

[0039] The reciprocating flip mechanism 4 also includes a pair of sliders 412 slidably connected to the inner wall of the top of the protective shell 1, the middle parts of the pair of sliders 412 are threadedly connected to the outer wall of the reciprocating screw rod 45, the bottom of the sliders 412 are fixedly connected to the connecting rods 414, the outer walls of the two connecting rods 414 are movably sleeved with defrost rods 43, the outer walls of the tops of the two defrost rods 43 are fixedly connected to the flat gears 42, and the tops of the defrost rods 43 are also fixedly connected to a pair of slide columns 411, and the slide columns 411 are arranged below the flat gears 42;

[0040] The reciprocating flip mechanism 4 also includes an L-shaped long plate 41 fixedly connected to both sides of the top of the protective shell 1, the outer wall of the L-shaped long plate 41 is fitted with the outer wall of the flat gear 42, a rotating groove 49 is opened at the bottom of the L-shaped long plate 41, the outer wall of the sliding column 411 is slidably connected in the rotating groove 49, one side of the rotating groove 49 is set as a straight groove, and the other side of the rotating groove 49 is set as a bending groove, and a telescopic block 410 is slidably connected to the side of the rotating groove 49 close to the bending groove, and a return spring 413 is fixedly connected to the side of the telescopic block 410 away from the flat gear 42, and one end of the return spring 413 away from the telescopic block 410 is fixedly connected to the inner wall of the L-shaped long plate 41, and a rack plate 44 is fixedly connected to the side of the top of the L-shaped long plate 41 close to the bending groove;

[0041] The side of the telescopic block 410 close to the sliding column 411 is inclined relative to the L-shaped long plate 41, and the inclined surface of the telescopic block 410 is arranged from high to low from the straight groove to the bending groove of the rotary groove 49;

[0042] The defrost rod 43 can be slidably and rotatably connected to the outer wall of the connecting rod 414, and the bending groove of the rotary groove 49 is set to be an isosceles trapezoid, so that the sliding column 411 can slide upward for a period of time and then rotate and slide towards the straight groove.

[0043] The effects achieved by this embodiment are as follows: In the prior art, since the arrangement of the heating circuit is usually fixed, its flexibility is limited when applied to equipment of different shapes and sizes, and it is difficult to adapt to various complex environments. Secondly, the uniformity of defrosting is also limited, because the distribution of frost on the surface of the evaporator 3 may be uneven, resulting in poor defrosting effect in some areas, while other areas may be overheated, affecting the normal operation of the equipment or increasing energy consumption. Compared with the prior art, through the implementation of this embodiment, a reciprocating flipping mechanism 4 is set, and a reciprocating screw rod 45 and an L-shaped long plate 41 are set, so that the defrost rod 43 can not only reciprocate on the surface of the evaporator 3, but also be limited and flipped by the rack plate 44 and the rotating groove 49 at the turning point, so as to achieve double-sided heating and defrosting, and the defrost rod 43 does not fit the evaporator 3, so as to avoid wear on the surface of the evaporator 3, and the frost on the surface of the evaporator 3 is melted by the heat of the heating wire 52, and the mobile defrosting method replaces the traditional fixed heat source heating, which can more accurately control the heat distribution.

[0044] Further examples:

[0045] Please refer to Figures 3 to 5 As shown, the scraping and drying mechanism 5 includes a vertical scraper 53 fixedly connected to the outer wall of the defrost rod 43, a baffle 57 fixedly connected to the bottom of the vertical scraper 53, silicone scrapers 55 fixedly connected to the edges of both sides of the vertical scraper 53, and sponge pads 56 fixedly connected to the sides of the two silicone scrapers 55 close to each other;

[0046] The scraping and drying mechanism 5 also includes a heater 51 fixedly connected to the bottom of the defrost rod 43, and electric heating wires 52 are fixedly connected on both sides of the heater 51. The two groups of electric heating wires 52 are connected in series in a ring shape and are evenly laid on the outer wall of the defrost rod 43. The electric heating wires 52 are electrically connected to the heater 51. A slide box 54 is fixedly connected to the bottom of the evaporator 3, and the bottom of the defrost rod 43 is slidably connected to the inner wall of the slide box 54;

[0047] The cross section of the vertical scraper 53 is arc-shaped and the concave part of the arc surface is arranged toward the defrost rod 43;

[0048] The vertical scraper 53 is used to support and fix the silicone scraper head 55 and the sponge pad 56, which are both located on the side of the vertical scraper 53 close to the defrost rod 43, ensuring that the sponge pad 56 can always absorb the scraped water stains before and after flipping.

[0049] The effects achieved by this embodiment are as follows: In the prior art, water melted from frost will form water stains. If not removed in time, the water stains will accumulate on the surface of the evaporator 3, causing frost to form again. Continuously heating the circuit not only consumes a large amount of energy and increases operating costs, but may also accelerate the aging of the equipment. Compared with the prior art, through the implementation of this embodiment, a scraping and drying mechanism 5 is set up to be able to be connected in series in a circle with electric heating wires 52 and evenly laid on the outer wall of the defrost rod 43. Not only can the heat of the electric heating wires 52 be evenly released along the defrost rod 43, but also before and after the defrost rod 43 is flipped, the surface of the evaporator 3 can always be defrosted by releasing heat through the electric heating wires 52 on one side, while the electric heating wires 52 on the other side release heat to assist in drying the sponge pad 56. The operation of the double-headed motor 46 can be stopped after the water stains are scraped off, thereby reducing energy consumption and increasing the service life and energy efficiency of the equipment.

[0050] The complete usage steps and working principle of the above embodiment are as follows:

[0051] In the initial state: the defrost rod 43 is located at a side away from the rack plate 44, and the return spring 413 is in a naturally relaxed state.

[0052] During use, when frost appears on the surface of the evaporator 3, the staff first starts the double-headed motor 46 to drive the rotating shafts 47 on both sides to rotate, and the main bevel gear 415 is used to rotate synchronously through the rotating shafts 47, and then the main bevel gear 415 drives the auxiliary bevel gear 416 and the reciprocating screw 45 to rotate together. Due to the setting of the reciprocating screw 45, the slider 412 located on the outer wall of the reciprocating screw 45 can slide back and forth on the inner wall of the protective shell 1, and then the slider 412 drives the connecting rod 414 and the defrost rod 43 to move back and forth synchronously, and then the heat is dissipated through the heating wire 52 on the outer wall of the defrost rod 43 to melt the frost on the surface of the evaporator 3. In this process, when the defrost rod 43 moves from the initial position toward the rack plate 44, the flat gear 42 always slides in close contact with the L-shaped long The outer wall of the plate 41, and the slide post 411 is always slidably connected in the straight groove of the rotary groove 49. Then, when the slide post 411 reaches the telescopic block 410, since the side of the telescopic block 410 close to the slide post 411 is inclined relative to the L-shaped long plate 41, and the inclined surface of the telescopic block 410 is arranged from high to low from the straight groove of the rotary groove 49 to the bending groove, the slide post 411 abuts against the high side surface of the telescopic block 410 at this time, and the slide post 411 will be squeezed by the telescopic block 410 to slide upward into the bending groove. Since the bending groove of the rotary groove 49 is arranged to be an isosceles trapezoid, the slide post 411 first moves obliquely upward after entering the bending groove, and moves the defrost rod 43 and the flat gear 42 upward as a whole. Then the slide post 411 slides a distance along the current position. At this time, the flat gear 42 moves upward and is aligned with the gear When the strip plate 44 is in a meshing state and the defrost rod 43 and the slide column 411 slide, the flat gear 42 can drive the defrost rod 43 to rotate, causing the defrost rod 43 to flip over a circle, and the slide column 411 on the other side is clamped into the bending groove of the rotary groove 49, and then the slide column 411 moves obliquely downward in the bending groove, and the defrost rod 43 and the flat gear 42 are moved down and reset as a whole. Under the reciprocating action of the reciprocating screw rod 45, the slide column 411 slides along the current position in the direction away from the rack plate 44, that is, the defrost rod 43 rotates in the opposite direction after flipping. When the slide column 411 passes the position of the telescopic block 410, the telescopic block 410 can be squeezed along the low side slope of the telescopic block 410. At this time, the reset spring 413 is in a compressed state, and the slide column 411 slides into the rotary groove after passing the telescopic block 410. The defrost rod 43 is moved back and forth in the straight groove 49, and the return spring 413 resets the telescopic block 410 by elastic force for the next use. The slide column 411 continues to drive the defrost rod 43 to slide in the straight groove to move the defrost rod 43 to the initial position. This reciprocating process allows the defrost rod 43 to continuously slide back and forth on the outside of the evaporator 3 without being in contact with the evaporator 3, thereby avoiding wear on the surface of the evaporator 3. The heat from the heating wire 52 melts the frost on the surface of the evaporator 3, and replaces the traditional fixed heat source heating with a mobile defrosting method, which can more accurately control the heat distribution and avoid local overheating or uneven heating that may occur during traditional fixed heat source heating, thereby saving energy. In addition, by flipping the defrost rod 43, the heat emitted by the heating wires 52 on both sides can also have a certain stirring effect.Further enhance the uniformity of heating;

[0053] Please refer to the above working process Figures 1 to 3 , Figures 6 to 8 .

[0054] Furthermore, during the movement of the defrost rod 43, the heater 51 always heats the heating wire 52. The heating wire 52 is connected in series in a loop and evenly laid on the outer wall of the defrost rod 43. Not only can the heat of the heating wire 52 be evenly released along the defrost rod 43, but also the heating wire 52 on one side always releases heat toward the evaporator 3 before and after the defrost rod 43 is flipped. When the heating wire 52 continuously melts the frost on the surface of the evaporator 3 into water, the water stains on the surface of the evaporator 3 can be scraped off by the silicone scraper 55 and then adsorbed by the sponge pad 56. The vertical scraper 53 is in an arc shape with the concave part of the arc surface facing the direction of the defrost rod 43, which can better concentrate the stress for the silicone scraper 55 to scrape off the water stains, thereby improving the The durability is improved, and the baffle 57 can be set to block the water stains that cannot be absorbed in the future, and the sponge pad 56 can slowly absorb them to prevent the water from sliding down and freezing on the bottom parts. In addition, after each flip, the sponge pad 56 that absorbs water will face outward. Since one side of the two heating wires 52 always faces outward, when the inner heating wire 52 and the sponge pad 56 are working, the outer heating wire 52 can assist in drying the water of the sponge pad 56. With the flipping effect of the defrost rod 43, the sponge pad 56 can absorb water and dry it simultaneously, so that when it is flipped next time, the sponge pad 56 can still maintain the water absorption state, which improves the reusability of the device and also improves the use efficiency of the device.

[0055] Please refer to the above working process Figures 3 to 5 .

[0056] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air source heat pump unit capable of providing frost protection, for frost treatment, comprising a protective shell (1), characterized in that: The top of the protective shell (1) is fixedly connected to a grid (2) on all sides, the top inner surface of the protective shell (1) is fixedly connected to an evaporator (3), and further comprises: A reciprocating flipping mechanism (4) is used to reciprocate and heat the outer surface of the evaporator (3) to remove frost, and flip it for replacement use; A scraping and drying mechanism (5) is used to scrape and collect water melted from frost on the surface of the evaporator (3) and assist in drying; The reciprocating flip mechanism (4) comprises a double-headed motor (46) fixedly connected to the top edge of the protective shell (1), the output ends on both sides of the double-headed motor (46) are fixedly connected to a rotating shaft (47), the two rotating shafts (47) are fixedly connected to a main bevel gear (415) on the sides away from each other, the outer walls of the two main bevel gears (415) are meshingly connected to a secondary bevel gear (416), the two secondary bevel gears (416) are fixedly connected to a reciprocating screw rod (45) on the sides away from the double-headed motor (46), a pair of fixed plates (48) are fixedly connected at the top corners of the protective shell (1), the outer walls of the reciprocating screw rod (45) and the rotating shaft (47) are respectively rotatably connected to the inner wall of the fixed plate (48), and the side of the reciprocating screw rod (45) away from the fixed plate (48) is rotatably connected to the inner wall of the protective shell (1); The reciprocating flip mechanism (4) also includes a pair of sliders (412) slidably connected to the inner wall of the top of the protective shell (1); the middle parts of the pair of sliders (412) are threadedly connected to the outer wall of the reciprocating screw rod (45); the bottoms of the sliders (412) are fixedly connected to connecting rods (414); the outer walls of the two connecting rods (414) are movably sleeved with defrost rods (43); the top outer walls of the two defrost rods (43) are fixedly connected to the flat gears (42); the tops of the defrost rods (43) are also fixedly connected to a pair of slide columns (411); the slide columns (411) are arranged below the flat gears (42); The reciprocating flip mechanism (4) also includes an L-shaped long plate (41) fixedly connected to both sides of the top of the protective shell (1), the outer wall of the L-shaped long plate (41) is in contact with the outer wall of the flat gear (42), a rotating groove (49) is provided at the bottom of the L-shaped long plate (41), the outer wall of the sliding column (411) is slidably connected in the rotating groove (49), one side of the rotating groove (49) is configured as a straight groove, and the other side of the rotating groove (49) is configured as a bending groove, a telescopic block (410) is slidably connected to the side of the rotating groove (49) close to the bending groove, a return spring (413) is fixedly connected to the side of the telescopic block (410) away from the flat gear (42), one end of the return spring (413) away from the telescopic block (410) is fixedly connected to the inner wall of the L-shaped long plate (41), and a rack plate (44) is fixedly connected to the side of the top of the L-shaped long plate (41) close to the bending groove; The scraping and drying mechanism (5) comprises a vertical scraper (53) fixedly connected to the outer wall of the defrost rod (43), a baffle (57) fixedly connected to the bottom of the vertical scraper (53), silicone scrapers (55) fixedly connected to the edges of both sides of the vertical scraper (53), and sponge pads (56) fixedly connected to the sides of the two silicone scrapers (55) close to each other; The scraping and drying mechanism (5) further comprises a heater (51) fixedly connected to the bottom of the defrosting rod (43), and both sides of the heater (51) are fixedly connected to electric heating wires (52); Before and after the defrosting rod (43) is turned over, the heating wire (52) on one side always releases heat to defrost the surface of the evaporator (3), while the heating wire (52) on the other side releases heat to assist in drying the sponge pad (56); The slide post (411) is always slidably connected in the straight groove of the rotary groove (49). Then, when the slide post (411) reaches the telescopic block (410), since the side of the telescopic block (410) close to the slide post (411) is inclined relative to the L-shaped long plate (41), and the inclined surface of the telescopic block (410) is arranged from high to low in the direction from the straight groove of the rotary groove (49) to the bent groove, the slide post (411) abuts against the high side surface of the telescopic block (410). 1) will be squeezed by the telescopic block (410) and slide upward into the bending groove. Since the bending groove of the rotary groove (49) is set to an isosceles trapezoid, the slide column (411) will first move obliquely upward after entering the bending groove, moving the defrost rod (43) and the flat gear (42) upward as a whole. Then the slide column (411) will slide a distance along the current position. At this time, the flat gear (42) moves upward and is in meshing state with the rack plate (44). The defrost rod (43) and the slide column (411) When sliding, the flat gear (42) drives the defrost rod (43) to rotate, causing the defrost rod (43) to turn over a circle, and the sliding column (411) on the other side is clamped into the bending groove of the rotary groove (49), and then the sliding column (411) moves obliquely downward in the bending groove, and the defrost rod (43) and the flat gear (42) are moved downward and reset as a whole. Under the reciprocating action of the reciprocating screw (45), the sliding column (411) slides along the current position in the direction away from the rack plate (44). That is, after the defrost rod (43) is turned over, it makes a reverse rotational movement. When the slide column (411) passes the position of the telescopic block (410), it squeezes the telescopic block (410) along the low side slope of the telescopic block (410). At this time, the return spring (413) is in a compressed state. After the slide column (411) passes the telescopic block (410), it slides into the straight groove of the rotary groove (49). At this time, the return spring (413) resets the telescopic block (410) through the elastic force so that it can be used next time.

2. The air source heat pump unit capable of providing frost protection according to claim 1, characterized in that: The two groups of heating wires (52) are connected in series in a circle shape and are evenly laid on the outer wall of the defrost rod (43). The heating wires (52) are electrically connected to the heater (51). The bottom of the evaporator (3) is fixedly connected to a slide box (54), and the bottom of the defrost rod (43) is slidably connected to the inner wall of the slide box (54).

3. The air source heat pump unit capable of providing frost protection according to claim 2, characterized in that: The cross section of the vertical scraper (53) is in an arc shape, and the concave part of the arc surface is arranged toward the defrosting rod (43).

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