Heat melting device for removing snow on top of greenhouse
Through hydraulic control rack movement and water-through control plug design, uniform melting of snow on the top of the greenhouse is achieved, solving the problems of uneven shading and melting caused by existing devices, and improving melting efficiency and lighting conditions.
Patent Information
- Application Number
- CN202510687906.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-27
- Publication Date
- 2025-08-15
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When the existing thermal energy melting device melts on the top of the greenhouse, the top of the greenhouse is too blocked, the lighting conditions are poor, and the snow melts at both ends unevenly, which is difficult to effectively solve the problem in the existing technology.
A thermal energy melting device for snow removal on the roof of greenhouses was designed. The rack movement was controlled through the hydraulic cylinder, which drove the heat equalization plate to flip. Combined with the misalignment and alignment of the water-through control plugs, the uniform distribution of hot water was achieved, the heat loss was reduced, and the uniformity of snow melting was improved.
Without affecting the light transmittance of the greenhouse, the uniform distribution of hot water is achieved, the heat loss is reduced, the uniformity of melting snow on the roof of the greenhouse is improved, and the reduction of the internal lighting conditions of the greenhouse is avoided.
Smart Images
Figure CN120486669A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of regional heating, and in particular to a thermal energy melting device for snow removal on the top of a greenhouse. Background Art
[0002] Greenhouses are essential facilities for modern agriculture. Snow easily accumulates on their roofs during cold weather. This accumulation not only adds weight to the greenhouse, posing a threat to its structural safety, but also blocks sunlight, affecting the light and temperature inside the greenhouse, and ultimately, the growth of crops. Traditional snow removal methods rely primarily on manual labor or mechanical devices, but these methods are not only time-consuming and labor-intensive, but also difficult to operate in extreme weather conditions and inefficient.
[0003] In recent years, with the continuous development of energy and temperature control technologies, thermal snow melting and removal technology has gradually attracted attention. This technology uses heat energy to melt snow on greenhouse roofs. It requires no human intervention, is simple to operate, highly efficient, and can operate continuously in adverse weather conditions. However, existing thermal melting devices are mostly designed for roofs or roads and are not fully adapted to the structural characteristics and snow removal requirements of greenhouses.
[0004] The film materials currently used in greenhouses are mainly polyethylene or polyvinyl chloride, which have poor load-bearing capacity, and manual pushing and pulling can easily cause damage to the plastic film of the greenhouse. For example, if a heating system is used, water pipes, heating pipes or heat conducting plates need to be arranged at the top of the interior of the greenhouse to form a pipeline at the top of the interior of the greenhouse, and use heating to melt the snow on the top of the greenhouse. However, the heating pipes are arranged at the top of the interior of the greenhouse. In order to ensure a wide distribution of melting, too many pipes are arranged, which can easily lead to poor lighting conditions inside the greenhouse when there is no need to melt the snow. Moreover, after the heat source inside the pipe moves, due to the generally long length of the greenhouse, the heat is absorbed by the snow on the roof. During the movement of the heat source, the heat decreases, and the snow at both ends of the greenhouse melts unevenly.
[0005] In the existing technology, there is a lack of equipment and technology that can well solve the above problems. Summary of the Invention
[0006] The present invention provides a thermal melting device for removing snow from the top of a greenhouse, which is used to solve the defects in the prior art that when the snow on the top of the greenhouse melts, the top of the greenhouse is excessively shaded and the snow on the tops of both ends of the greenhouse melts unevenly.
[0007] The present invention provides a thermal melting device for removing snow from the top of a greenhouse, comprising: a greenhouse main frame, the greenhouse main frame comprising a plurality of evenly distributed arched support frames and support vertical rods, a main roof support rod being provided at the middle of the top inner portion of the greenhouse main frame, side support baffles being fixedly connected to both sides of the top inner portion of the greenhouse main frame, the arched support frames being fixedly connected to the main roof support rods, and the arched support frames being fixedly connected to the side support baffles; a heat conduction component, the heat conduction component being provided at the top inner portion of the greenhouse main frame; a control component, the control component being provided at a side away from each other from the side support baffles; a temperature controller, the temperature controller being provided at the interior of the greenhouse main frame; and a temperature sensing safety protector, the temperature sensing safety protector being provided at the top inner portion of the greenhouse main frame.
[0008] Optionally, the heat conduction component includes a heat spreader, which is arranged between the main support rod of the roof and the side support baffles, and a rotating shaft is provided between the main support rod of the roof and the side support baffles. The heat spreader is rotatably connected between the main support rod of the roof and the side support baffles through the rotating shaft, and the upper end of the heat spreader is fixedly connected to the rotating shaft. A filling cavity is provided inside the main support rod of the roof, and reflux collection pipes are provided at the front and back of both sides of the top of the main frame of the greenhouse. A serpentine water flow cavity is provided inside the heat spreader, and the interior of the water flow cavity passes through the two ends of the rotating shaft and the interior of the filling cavity and the reflux collection pipe. The pipeline is internally connected; a heating temporary storage box is provided in the middle of the top of the interior of the main frame of the greenhouse, and the heating temporary storage box is connected through the water pipe in the middle of the upper end and the main support rod of the roof; an electric heating element is provided at the upper end of the exterior of the heating temporary storage box, and a return water pipe is fixedly connected to the position near the middle of the outer lower end of the return collection pipe; a water storage tank with a heat preservation function is provided in the middle of the lower end of the interior of the main frame of the greenhouse, and the other end of the return water pipe connected to the return collection pipe is connected to the water tank, and the other end of the rotating shaft connected to the main support rod of the roof extends to the side where the side support baffles are away from each other.
[0009] Optionally, a first water control plug is fixedly connected to one end of the rotating shaft near the main support rod of the roof, and a second water control plug is provided inside the rotating shaft connected to the main support rod of the roof to cooperate with the first water control plug; when the heat spreader is in a vertical state, the through hole of the first water control plug and the through hole of the second water control plug are staggered, and when the heat spreader is in a horizontal state, the through hole of the first water control plug and the through hole of the second water control plug are aligned, and a one-way valve is provided inside one end of the rotating shaft near the side support baffle.
[0010] Optionally, the control component includes a dovetail slide rail, which is fixedly connected to the lower end of the side support baffle. A rack that can move forward and backward is provided on the front and rear sides of the dovetail slide rail on the side away from the side support baffle, the teeth of the rack face upward, and the side of the rack away from the side support baffle is fixedly connected to a connection control plate. The middle part of the lower end of the side away from the side of the side support baffle is fixedly connected to two symmetrically arranged mounting plates, and the sides of the mounting plates away from each other are fixedly connected to a hydraulic cylinder, and the output end of the hydraulic cylinder is fixedly connected to the side close to the connection control plate.
[0011] Optionally, the rotating shaft is fixedly connected to a gear at one end extending from the side support baffle, and the gear is engaged with the rack; when the racks move away from each other until the hydraulic cylinder is extended to its longest, the heat spreader is in a horizontal state, and when the racks move close to each other until they contact, the heat spreader is in a vertical state.
[0012] Optionally, the temperature controller is fixedly connected to one side of the interior of the greenhouse main frame, and the temperature-sensing safety protectors are respectively fixedly connected to the front and rear of the exterior of the thermal storage box.
[0013] Optionally, when the heat spreader is in a horizontal state, the distance between the top end and the plastic film pre-laid on the outside of the greenhouse main frame is 10~20cm. When the heat spreader is in a horizontal state, the upper side is an oxygen-free copper metal sheet, and when the heat spreader is in a horizontal state, the lower side is an aluminum foil heat reflection layer.
[0014] Optionally, a water pipe is fixedly connected to the outer upper end of the water tank, the upper end of the water pipe is fixedly connected to the middle of the lower end of the main support rod of the roof, the thermal storage box and the filling cavity are connected by a water pipe, and a water pump is provided on the water pipe and the water pipe.
[0015] Optionally, the temperature controller is electrically connected to the electric heating element, and the temperature sensing safety protector is electrically connected to the electric heating element.
[0016] Optionally, a sealing bushing is provided at the connection between the rotating shaft and the main support rod of the roof, and a temperature detector is fixedly connected to the side of the upper end of the exterior of the thermal storage box away from the temperature controller.
[0017] The present invention provides a thermal melting device for snow removal on the top of a greenhouse. Heated water is injected into the filling cavity inside the main support rod of the roof at the middle top position inside the main frame of the greenhouse. After heating is completed, the movement of the rack is controlled by the extension and contraction of the hydraulic cylinder. The movement of the rack drives the heat spreader to flip through the rotation of the gear, so that when the snow does not need to be melted, the heat spreader is vertical, and when the snow needs to be melted, the heat spreader is horizontal, which is convenient for flipping the heat spreader when the snow does not need to be melted, reducing the impact on the light transmittance of the greenhouse. When the heat spreader rotates, the misalignment and alignment of the openings of the two water control plugs are utilized. When the heat spreader is flipped to be parallel to the top of the greenhouse, water is passed synchronously to make the hot water more evenly distributed, reduce the heat loss caused by the transportation of hot water, and increase the uniformity of melting the snow on the top of the greenhouse. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention Figure 2 ; Figure 3 It is a three-dimensional schematic diagram of part of the structure of the present invention Figure 1 ; Figure 4 This invention Figure 3 A magnified view of point A in the figure; Figure 5 This invention Figure 3 Enlarged view of point B in FIG. Figure 6 It is a three-dimensional schematic diagram of part of the structure of the present invention Figure 2 ; Figure 7 It is a three-dimensional schematic diagram of part of the structure of the present invention Figure 3 ; Figure 8 This is a schematic enlargement of a partial structural cross section of the present invention. Figure 1 ; Figure 9 This is a schematic enlargement of a partial structural cross section of the present invention. Figure 2 ; Figure 10 This is a partial structural schematic enlargement of the present invention Figure 1 ; Figure 11 This is a partial structural schematic enlargement of the present invention Figure 2 ; Figure 12 is an enlarged schematic diagram of a cross section of a heat conducting plate of the present invention; Figure 13 It is a schematic enlarged perspective view of the internal structure of the one-way valve of the present invention.
[0020] Reference numerals: 1. Greenhouse main frame; 101. Arched support frame; 102. Support vertical rod; 2. Heat conduction component; 201. Heat sink; 202. Rotating shaft; 203. Filling chamber; 204. Return collection pipe; 205. Water flow channel; 206. Thermal storage box; 207. Electric heating element; 208. Return pipe; 209. Water storage tank; 3. Control component; 301. Dovetail slide; 302. Rack; 303. Connection control board; 304. Mounting plate; 305. Hydraulic cylinder; 306. Gear; 4. Temperature controller; 5. Temperature sensing safety protector; 6. Main support rod of the roof; 7. Side support baffle; 8. First water control plug; 9. Second water control plug; 10. One-way valve; 11. Water pipe; 12. Sealing bushing; 13. Temperature detector. DETAILED DESCRIPTION
[0021] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0022] As mentioned above, the current heating pipes are arranged at the top of the greenhouse. In order to ensure a wide distribution of melting, too many pipes are arranged, which can easily lead to poor lighting conditions inside the greenhouse when there is no need to melt snow. Moreover, after the heat source inside the pipes moves, the heat is absorbed by the snow on the roof due to the generally long length of the greenhouse. During the movement of the heat source, the heat decreases, and the snow at both ends of the greenhouse melts unevenly.
[0023] To this end, the present invention provides a thermal melting device for removing snow from the top of a greenhouse. The device can inject heated water into the filling cavity inside the main support rod of the roof at the middle position of the top inside the main frame of the greenhouse. After heating is completed, the movement of the rack is controlled by the extension and contraction of the hydraulic cylinder. The movement of the rack drives the heat spreader to flip through the rotation of the gear, so that when the snow does not need to be melted, the heat spreader is vertical, and when the snow needs to be melted, the heat spreader is horizontal, which is convenient for flipping the heat spreader when the snow does not need to be melted, reducing the impact on the light transmittance of the greenhouse, and when the heat spreader rotates, the misalignment and alignment of the openings of the two water control plugs are utilized. When the heat spreader is flipped to be parallel to the top of the greenhouse, water is passed synchronously to make the hot water more evenly distributed, reducing heat loss caused by transporting hot water.
[0024] The following combination Figures 1 to 13 The present invention will be described in detail.
[0025] First embodiment: like Figures 1 to 3 As shown, in this embodiment, the greenhouse top snow removal and thermal melting device includes a greenhouse main frame 1, wherein the greenhouse main frame 1 is composed of a plurality of arch support frames 101 and support vertical rods 102. The arch support frames 101 are evenly distributed and are used to hold up the plastic film used for the greenhouse so that the plastic film can be stretched along the direction of the arch support frames 101. In addition, every two adjacent arch support frames 101 are connected by support vertical rods 102. The support vertical rods 102 support and reinforce the adjacent arch support frames 101, so that the dispersed arch support frames 101 are connected into a whole. Figure 1 As shown, a main roof support rod 6 is set at the middle of the inner top of the main frame 1 of the greenhouse. The main roof support rod 6 connects the top of the arch support frame 101 and then bends at both sides of the upper end of the arch support frame 101 as shown in FIG. Figures 1 to 6 As shown, side support baffles 7 are provided, and the arch support frame 101 is reinforced by the main support rods 6 of the roof and the side support baffles 7 on both sides to facilitate subsequent installation.
[0026] The interior of the main roof support rod 6 is hollow, forming a filling cavity 203. The main roof support rod 6 is made of stainless steel. EPP insulation foam cotton with aluminum foil is pasted on the outside of the main roof support rod 6. The outside of the main roof support rod 6 needs to be equipped with a pressure relief valve. Several evenly distributed heat-spreading plates 201 are set between the main roof support rod 6 and the side support baffle 7. The heat-spreading plates 201 are mainly made of aluminum. A serpentine water flow cavity 205 is opened inside the heat-spreading plates 201. Figure 12As shown, a rotating shaft 202 is set on one side of the heat spreader 201. The rotating shaft 202 is between the main support rod 6 of the roof and the side support baffle 7. The two ends of the rotating shaft 202 are rotatably connected to the main support rod 6 of the roof and the side support baffle 7, so that the heat spreader 201 can rotate, and one end of the rotating shaft 202 is connected to the inside of the filling cavity 203. The two ends of the rotating shaft 202 are tubular and connected to the inside of the water flow channel 205. Sealing bushings 12 are set at the positions where the rotating shaft 202 and the main support rod 6 of the roof are rotatably connected to seal the connection. To prevent water leakage at the connection and ensure sealing, under normal circumstances, one side of the heat spreader 201 is connected to the rotating shaft 202, and the other side not connected to the rotating shaft 202 is facing downward, so that the heat spreader 201 is in a vertical state, and the heat spreader 201 and the top of the greenhouse are in a perpendicular state. In this way, when the greenhouse is in normal use, the degree of shading of the greenhouse top by the heat spreader 201 can be reduced. When the snow on the roof needs to be melted by heat energy, the heat spreader 201 is rotated to a position parallel to the greenhouse top through the rotating shaft 202, and the heat spreader 201 at this time becomes horizontal (such as Figure 5 and Figure 6 As shown), the upward side of the heat spreader 201 that is rotated to this state, that is, the side close to the top of the greenhouse, is made of a thin sheet of oxygen-free copper to increase the thermal conductivity of this surface. In order to reduce the heat loss caused by the downward heat radiation of the heat spreader 201, the downward side of the heat spreader 201 when in a horizontal state is pasted with rock wool, and the bottom is covered with a heat reflective layer of aluminum foil to reduce the heat loss caused by the heat inside the heat spreader 201 radiating away from the roof.
[0027] ,in, is the heat required to melt the snow (in joules, J); is the mass of snow (in kilograms, kg); is the latent heat of melting of snow (approximately ).
[0028] h， in, is the mass of snow (in kilograms, kg); is the surface area of snow, (units are ); h is the thickness of the snow (in meters); is the density of snow, (unit is ).
[0029] It should be noted that the density of snow varies at different times. New snow is composed of many complex-shaped ice crystals with large gaps between them and high air content, so it is relatively loose and its density is generally between 50 and 100. ; Under the influence of gravity, wind and other factors, the snow becomes denser and the density of the snow increases, usually between 200 and 300 ; The density of snow after melting and refreezing is even higher, about 500~800 .
[0030] Rock wool is pasted on the lower surface of the heat spreader 201. Since the fibers of rock wool are slender and intertwined, countless tiny air pores are formed between them. Since air is a poor conductor of heat energy, the amount of heat radiation emitted by the heat spreader 201 facing downward away from the roof when it is in a horizontal state can be reduced. In order to further reduce heat loss, a layer of EPP foam with an aluminum foil on the bottom is pasted on the lower layer of the rock wool to increase the thermal insulation of the bottom of the heat spreader 201 and use the high reflectivity of the aluminum foil to reflect heat from the bottom of the heat spreader 201.
[0031] In order to enable the heat spreader 201 to rotate and adjust between the horizontal state and the vertical state, a dovetail slide rail 301 is fixedly connected to the lower position on the side where the side support baffles 7 are away from each other, and a rack 302 with teeth facing upwards that can slide back and forth is set on the front and back of each dovetail slide rail 301. The end of the rotating shaft 202 on the heat spreader 201 away from the main support rod 6 of the roof extends from the side where the side support baffles 7 are away from each other, and is rotatably connected between the side support baffles 7. A gear 306 is set at the end of the rotating shaft 202 extending to the side where the side support baffles 7 are away from each other, and the gear 306 and the rack 302 are meshed together. A connecting control plate 303 is fixedly connected to the middle part of each rack 302 away from the side support baffle 7, and a mounting plate 304 is set symmetrically about the front and back at the position near the middle of the greenhouse main frame 1 on the side where the side support baffles 7 are away from each other (such as Figure 2 and Figure 3As shown in FIG, a hydraulic cylinder 305 is installed on the side where the front and rear mounting plates 304 are away from each other. The output ends of the hydraulic cylinder 305 are fixedly connected to the sides where the front and rear connection control plates 303 are close to each other. The rack 302 is controlled by the hydraulic cylinder 305. When the hydraulic cylinder 305 is extended, the corresponding connection control plate 303 and the mounting plate 304 are separated from each other, and the front and rear racks 302 are separated from each other, and the gear 306 on the rotating shaft 202 is oscillated from below to make the heat spreader 201 flip over. When the racks 302 are separated from each other until the hydraulic cylinder 305 is extended to its longest length, the heat spreader 201 is in a horizontal state. When the racks 302 are close to each other and in contact, the heat spreader 201 is in a vertical state, which makes it easy to adjust the direction of the heat spreader 201. When the heat spreader 201 is not used to melt snow, it can reduce the shading of the greenhouse. Two spaces are formed between the three arched support frames 101 shown in the figure. The heat spreaders 201 arranged inside the two spaces are symmetrically arranged, and the movement of the racks 302 is also away from each other, allowing the heat spreaders 201 inside the two spaces to rotate symmetrically. The hydraulic cylinder is controlled and connected through a hydraulic station (not shown in the figure). The hydraulic system is a prior art and will not be described here.
[0032] Return flow collection pipes 204 are provided at the top positions on both sides of the interior of the greenhouse main frame 1, that is, at the position on the side away from each other of the side support baffles 7. As shown in the figure, four return flow collection pipes 204 are provided in this application. A return flow collection pipe 204 is provided on both sides of the interior top between each two adjacent arch support frames 101. The ends of the rotating shaft 202 extending from the side support baffles 7 are extended into the interior of the return flow collection pipe 204, and the connection between the rotating shaft 202 and the return flow collection pipe 204 is sealed so that the rotating shaft 202 can rotate and the sealing between the rotating shaft 202 and the return flow collection pipe 204 can be maintained.
[0033] By injecting hot water into the filling cavity 203 inside the main support rod 6 of the roof, the hot water inside the filling cavity 203 flows to the water flow cavity 205 inside the heat plate 201 through the connection of the rotating shaft 202, and the hot water inside the water flow cavity 205 radiates heat in the direction of the oxygen-free copper sheet attached to the heat plate 201, and radiates heat to the top of the interior of the greenhouse. Since the film of the greenhouse is mostly made of polyvinyl chloride, the heat plate 201 is too close to the upper end, which may easily cause the plastic film to soften, become thinner, or even break. Therefore, in order to reduce the damage to the plastic caused by heating, the oxygen-free copper sheet and the greenhouse are placed on the heat plate 201 in a horizontal state. The distance between the internal top plastic film needs to be controlled at 10~20cm. Since the heat radiation is diffuse, if the distance between the heat spreader 201 and the internal top of the greenhouse is too close, it will easily lead to a gap between the heat spreader 201, and too little heat will be conducted to the internal top of the greenhouse. The heat spreader 201 should be controlled at a certain distance from the internal top of the greenhouse. This can not only increase the uniformity of heat conduction from the heat spreader 201 to the internal top of the greenhouse, but also avoid damage to the plastic film caused by the heat spreader 201 being too close to the internal top of the greenhouse. In addition, the water used to melt the snow on the top of the greenhouse should be heated to 30~50℃.
[0034] like Figures 1 to 3 As shown, in this embodiment, a heating temporary storage box 206 with an insulation function is set at the top middle position inside the greenhouse main frame 1. The heating temporary storage box 206 is used to store and hold water that needs to be transported, and the water inside is heated to a certain temperature (30~50℃) for storage and insulation. It is heated by an electric heating element 207 set at the upper end of the outside of the heating temporary storage box 206. A water storage tank 209 with an insulation function is set at the middle position of the lower end of the interior of the greenhouse main frame 1. A return water pipe 208 is fixedly connected to the lower end of the return collection pipe 204 near the middle of the greenhouse main frame 1. The interior of the return water pipe 208 and the interior of the return collection pipe 204 are connected together, and the other end of the four return water pipes 208 connected to the return collection pipe 204 is connected to the water storage tank 209, so that the low-temperature water after absorbing heat can be returned to the interior of the water storage tank 209 for repeated use.
[0035] The upper end of the water storage tank 209 is fixedly connected to a water pipe 11, and the upper end of the water pipe 11 is fixedly connected to the lower end of the heating temporary storage tank 206, so that the water storage tank 209 and the interior of the heating temporary storage tank 206 are connected together. A water pump needs to be provided at the lower end of the heating temporary storage tank 206 to pump the water inside the water storage tank 209 into the interior of the heating temporary storage tank 206. The external upper end of the heating temporary storage tank 206 is connected to the filling cavity 203 inside the main support rod 6 of the roof through a water pipe to transport heated water to the filling cavity 203. A temperature controller 4 is provided in the middle position of one side inside the main frame 1 of the greenhouse, and a temperature detector 13 is fixedly connected to the side of the external upper end of the heating temporary storage tank 206 away from the temperature controller 4. The temperature detector 13 detects the temperature of the heated water inside the heating temporary storage tank 206 and transmits it to the temperature controller 4 for digital display, so as to conveniently know the water temperature inside the heating temporary storage tank 206.
[0036] After the hot water is transferred to the interior of the heat plate 201, it is absorbed by the snow on the top of the greenhouse, and then the water temperature after returning to the water storage tank 209 has a large temperature difference. After being transported up, it enters the interior of the heating temporary storage tank 206 for heating. After being heated to the set temperature, the temperature sensing safety protector 5 cuts off the power to the electric heating element 207 fixedly connected to the upper end of the exterior of the heating temporary storage tank 206, and the water in the heating temporary storage tank 206 stops heating. The water pump on the heating temporary storage tank 206 starts to extract the water in the heating temporary storage tank 206, and the heating temporary storage tank 206 is heated. The heated water inside is transported to the filling chamber 203 inside the main support rod 6 of the roof. After passing through the filling chamber 203, the water forms multiple branches inside each rotating shaft 202. After the branches, the water flows into the reflux collection pipe 204. In order to prevent the water from flowing into the reflux collection pipe 204 and then entering the water flow channel 205 inside other heat spreaders 201, a one-way valve 10 is set at one end of each rotating shaft 202 that is plugged into the reflux collection pipe 204. The one-way valve 10 is a spherical valve, such as Figure 13 As shown, there are circular holes in the center of both ends of the one-way valve 10, and the valve ball inside is a hollow ball. The movement of the valve ball can block the center holes at both ends of the one-way valve 10. There is a small hole in the center of the end close to the main support rod 6 of the roof, but there are several small holes on the edge of the end of the one-way valve 10 away from the main support rod 6 of the roof. In this way, when the water inside the water flow channel 205 can flow into the return collection pipe 204, it passes through the one-way valve 10 through the several small holes on the edge and enters the return collection pipe 204. When the water inside the return collection pipe 204 wants to flow back into the inside of other heat sinks 201, it pushes the valve ball to block the center circular hole of the valve ball inside the one-way valve 10 in the direction of the main support rod 6 of the roof, closing the passage, and the water can only flow to the return pipe 208.
[0037] Through the above design, the present invention uses the temperature controller 4 as the main controller to control the electric heating element 207 at the upper end of the outer part of the thermal storage box 206 to heat the water inside the thermal storage box 206 to 30~50℃. When the water inside the thermal storage box 206 is heated to a certain temperature, the temperature sensing safety protector 5 located in front and behind the outer part of the thermal storage box 206 controls the electric heating element 207 set at the upper end of the outer part of the thermal storage box 206 to cut off the power and stop heating. The water pump at the upper end of the outer part of the thermal storage box 206 starts to transport the hot water inside the thermal storage box 206 to the inside of the filling chamber 203, and the water is diverted to each heat sink 201 through the rotating shaft 202 inside the filling chamber 203 to form multiple water flow branches, which are filled into the interior of the water flow channel 205. The water flow space is reduced due to the one-way valve 10, which allows the hot water inside the heat spreader 201 to increase its retention time, and increases the heat absorption time of the hot water inside the heat spreader 201 by the snow on the top of the greenhouse. After the water flows through the heat spreader 201, it passes through the inside of the return collection pipe 204. Since the return collection pipe 204 is higher than the water tank 209, due to the height difference, the water inside the return collection pipe 204 flows back to the inside of the water tank 209 through the inside of the return pipe 208.
[0038] The total amount of heat that the water circulates and heats multiple times is: , (unit is J), after the snow on the top of the greenhouse absorbs heat, the remaining heat is , (unit is J), so , after reaching or / and exceeding the threshold of the minimum energy required for snow melting, the snow begins to melt, where is the heat required to melt the snow (in joules, J); is the mass of snow (in kilograms, kg); is the latent heat of melting of snow (approximately ); is the mass of snow (in kilograms, kg); is the surface area of snow, (units are ); h is the thickness of the snow (in meters); is the density of snow, (unit is ).
[0039] If the pipelines are distributed along the length of the greenhouse, the temperature of the hot water inside the pipelines will gradually decrease as the distance it is transported increases, causing the snow on the tops of both ends of the greenhouse to melt faster at one end and slower at the other. However, if the heat spreader 201 is arranged along the width of the greenhouse, and the heat spreader 201 accounts for half of the width of the greenhouse, the distance that the hot water flows will be greatly reduced, and the situation where the degree of melting is too different will be reduced, making it easy for the water inside the heat spreader 201 to maintain the energy threshold required to melt the snow.
[0040] Second embodiment: When hot water flows into the interior of the heat spreader 201 through the filling cavity 203, since the distances between the heat spreader 201 and the main frame 1 of the greenhouse are different, a second water control plug 9 is provided inside the main support rod 6 at the connection position between the rotating shaft 202 and the roof. The hole on the second water control plug 9 is a fan-shaped hole with an angle of 60 degrees. A first water control plug 8 is provided inside the end of the rotating shaft 202 inserted into the main support rod 6 of the roof. The first water control plug 8 also has a fan-shaped small hole with an angle of 60 degrees. The first water control plug 8 and the second water control plug 9 fit tightly together. When the first water control When the plug 8 rotates with the rotating shaft 202, that is, when the heat spreader 201 is in a horizontal state, the two fan-shaped holes of the first water control plug 8 and the second water control plug 9 coincide with each other. At this time, the water inside the filling cavity 203 can be transported to the inside of the heat spreader 201, and the water can flow to the inside of the heat spreader 201 after the filling cavity 203 is filled with hot water, realizing the function of distribution first and then circulation, ensuring the uniformity of circulation of the entire heat spreader 201, and converting the heat loss of melting snow along the length direction of the greenhouse into heat decrease along the shorter horizontal length direction of the greenhouse. The relative distance of heat decrease is small, which can increase the uniformity of melting snow on the top of the greenhouse.
[0041] Therefore, when this embodiment is implemented, the water is stored in the water tank 209 as a whole, and the water tank 209 can be disassembled for cleaning to reduce the risk of pipe blockage due to scale. The upper end of the water tank 209 is fixedly connected to a water pipe 11, and the water pump on the water pipe 11 transports the water inside the water tank 209 upward into the interior of the heating temporary storage tank 206, and the electric heating element 207 at the upper end of the external upper end of the heating temporary storage tank 206 heats the water inside the heating temporary storage tank 206. After the water inside the heating temporary storage tank 206 is heated to a suitable temperature, the heating temporary storage tank 206 and the shed are started. The water pump on the water pipe between the top main support rods 6 transports hot water to the filling chamber 203 inside the main support rods 6 of the roof. The pressure relief valve on the main support rods 6 of the roof is exhausted first. After the hot water is filled inside and the pressure relief valve discharges water, the four hydraulic cylinders are controlled by the hydraulic station and the hydraulic system to extend synchronously. The movement of the rack 302 causes the heat spreader 201 to start rotating, allowing the heat spreader 201 to rotate to a horizontal position. The small holes of the two water control plugs are aligned, and the inside of the water flow channel 205 is filled with hot water. The side of the oxygen-free copper sheet is set upward to radiate heat to the top of the greenhouse, and the snow on the top of the greenhouse absorbs heat and melts.
[0042] It should be noted that the water pump on the water supply pipe 11 and the water pump on the water pipe between the thermal storage box 206 and the main roof support rod 6 (the two water pumps are not shown in the figure) are existing products, and their connection methods and control methods are all existing technologies and will not be repeated here. In addition, the main roof support rod 6, the thermal storage box 206, the heat plate 201, the return collection pipe 204, the return water pipe 208 and the pipeline are all wrapped with EPP insulation foam coated with aluminum foil to reduce heat loss during the re-transportation of hot water.
[0043] The electric heating element 207 can adopt the air duct electric heater of model HRY1, HRY2, or HRY3 as the heat energy generating unit, and the temperature controller 4 can adopt the E5CN-Q2MTD temperature controller; the temperature detector 13 adopts the OMEGA TT-K-30-SLE thermocouple temperature detector, which is combined with the control circuit as a temperature control unit to set the temperature threshold of the heat energy generating unit heating and adjust the output power of the heat energy generating unit to control the temperature of the heat energy conduction unit. The heat conduction assembly 2 consisting of the heat plate 201, the rotating shaft 202, the filling cavity 203, the reflux collection pipe 204, the water flow cavity 205, the thermal storage box 206, the electric heating element 207, the return water pipe 208, and the water storage tank 209 is used as a heat energy conduction unit and is connected to the heat energy generating unit for transferring heat to the heat energy generating unit. It can be conducted to the top of the greenhouse to melt the accumulated snow; the control assembly 3 consisting of a dovetail slide rail 301, a rack 302, a connection control panel 303, a mounting plate 304 and a hydraulic cylinder 305, as well as a hydraulic station and a hydraulic system for controlling the hydraulic cylinder 305, controls the flipping of the heat spreader 201 for melting the accumulated snow on the top of the greenhouse; the temperature sensing safety protector 5 serves as a safety protection unit to prevent heat energy from damaging the greenhouse structure and ensure safe operation. The quantity of the heat generating unit, heat conducting unit, and safety protection unit needs to be adjusted according to the specific size of the greenhouse.
[0044] The outside of the main support rod 6 of the greenhouse roof and the return collection pipe 204 need to be insulated. The insulation of the main support rod 6 of the roof is mainly to prevent the hot water from not entering the heat plate 201 and causing a large temperature drop, which affects the melting of snow. The return collection pipe 204 is to prevent the hot water from flowing out of the heat plate 201 from the middle and flowing to the edge of the greenhouse, causing the temperature to be too low, forming low-temperature water inside the return collection pipe 204 or even freezing. The temperature control unit is used to set the temperature threshold, and the water pump transports the water inside the water tank 209 through the water pipe 11 to the inside of the thermal storage box 206. After being heated by the heat energy generating unit, the water is pumped to the thermal storage box 206. The heated water inside the storage box 206 is transported upward through the water pipe between the thermal storage box 206 and the main support rod 6 of the roof. After filling the entire filling cavity 203, the rack 302 is controlled by the control component 3 to turn the gear 306 and rotate the heat spreader 201 90°, so that the side of the heat spreader 201 with the oxygen-free copper metal sheet faces upward, and the heat energy is conducted through the heat conduction unit to melt the snow on the top of the greenhouse. When the water inside the thermal storage box 206 is heated to the set temperature, the safety protection unit will control the electric heating element 207 to stop heating until the internal water temperature of the thermal storage box 206 drops or / and low-temperature water re-enters the interior, and the electric heating element 207 is heated again.
[0045] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A thermal melting device for snow removal on the top of a greenhouse, characterized in that: include: A greenhouse main frame (1), the greenhouse main frame (1) comprising a plurality of evenly distributed arched support frames (101) and support vertical rods (102), a main roof support rod (6) being provided at the middle of the top of the interior of the greenhouse main frame (1), side support baffles (7) being fixedly connected to both sides of the top of the interior of the greenhouse main frame (1), the arched support frames (101) being fixedly connected to the main roof support rod (6), and the arched support frames (101) being fixedly connected to the side support baffles (7); A heat conduction component (2), the heat conduction component (2) being arranged at the top end inside the greenhouse main frame (1); A control assembly (3), the control assembly (3) being arranged on a side of the side support baffles (7) that is away from each other; A temperature controller (4), the temperature controller (4) being arranged inside the greenhouse main frame (1); A temperature-sensing safety protector (5) is provided at the top end of the interior of the greenhouse main frame (1).
2. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 1 is characterized in that: The heat conduction assembly (2) includes a heat soaking plate (201), the heat soaking plate (201) is arranged between the main support rod (6) of the roof and the side support baffle (7), and a rotating shaft (202) is provided between the main support rod (6) of the roof and the side support baffle (7), and the heat soaking plate (201) is rotatably connected between the main support rod (6) of the roof and the side support baffle (7) through the rotating shaft (202). The upper end of the heat soaking plate (201) and the rotating shaft (202) are connected to each other. ) are fixedly connected, a filling cavity (203) is provided inside the main support rod (6) of the shed roof, reflux collection pipes (204) are provided at the front and rear of both sides of the top of the shed main frame (1), a serpentine water flow cavity (205) is provided inside the heat spreader (201), and the inside of the water flow cavity (205) is connected through the two ends of the rotating shaft (202) and the inside of the filling cavity (203) and the inside of the reflux collection pipe (204); A heating temporary storage box (206) is provided at the middle of the top of the main frame of the greenhouse (1), and the heating temporary storage box (206) is connected to the main support rod (6) of the roof through the water pipe in the middle of the upper end. An electric heating element (207) is provided at the upper end of the external heating temporary storage box (206), and a return water pipe (208) is fixedly connected to the position near the middle of the lower end of the return collection pipe (204). A water storage tank (209) with a heat preservation function is provided at the middle of the lower end of the main frame of the greenhouse (1), and the other end of the return water pipe (208) connected to the return collection pipe (204) is connected to the water storage tank (209), and the other end of the rotating shaft (202) connected to the main support rod (6) of the roof extends to the side of the side support baffle (7) away from each other.
3. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 2 is characterized in that: A first water control plug (8) is fixedly connected to one end of the rotating shaft (202) close to the main roof support rod (6), and a second water control plug (9) used in conjunction with the first water control plug (8) is provided inside the rotating shaft (202) where the main roof support rod (6) is connected. When the heat spreader (201) is in a vertical state, the through hole of the first water control plug (8) and the through hole of the second water control plug (9) are staggered; when the heat spreader (201) is in a horizontal state, the through hole of the first water control plug (8) and the through hole of the second water control plug (9) are aligned; and a one-way valve (10) is provided inside one end of the rotating shaft (202) close to the side support baffle (7).
4. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 1 is characterized in that: The control assembly (3) includes a dovetail slide rail (301), the dovetail slide rail (301) is fixedly connected to the lower end of the side support baffle (7), and a rack (302) that can move forward and backward is provided on the side of the dovetail slide rail (301) that is away from the side support baffle (7), the teeth of the rack (302) face upward, and the side of the rack (302) away from the side support baffle (7) is fixedly connected to a connection control plate (303), and the middle part of the lower end of the side of the side support baffle (7) away from each other is fixedly connected to two symmetrically arranged mounting plates (304), and the side of the mounting plates (304) away from each other is fixedly connected to a hydraulic cylinder (305), and the output end of the hydraulic cylinder (305) is fixedly connected to the side of the connection control plate (303) that is close to each other.
5. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 2 or 4, characterized in that: The rotating shaft (202) is fixedly connected to a gear (306) at one end extending out of the side support baffle (7), and the gear (306) is meshed with the rack (302); When the racks (302) move away from each other until the hydraulic cylinder (305) is extended to its longest position, the heat spreader (201) is in a horizontal state; when the racks (302) move closer to each other until they are in contact, the heat spreader (201) is in a vertical state.
6. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 1, characterized in that: The temperature controller (4) is fixedly connected to one side of the interior of the greenhouse main frame (1), and the temperature sensing safety protector (5) is fixedly connected to the front and rear of the exterior of the thermal storage box (206).
7. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 2, characterized in that: When the heat spreader (201) is in a horizontal state, the distance between the top end and the plastic film pre-laid on the outside of the greenhouse main frame (1) is 10 to 20 cm. When the heat spreader (201) is in a horizontal state, the upper side is an oxygen-free copper metal sheet, and when the heat spreader (201) is in a horizontal state, the lower side is an aluminum foil heat reflection layer.
8. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 2, characterized in that: The upper end of the water storage tank (209) is fixedly connected to a water pipe (11), the upper end of the water pipe (11) is fixedly connected to the middle of the lower end of the main support rod (6) on the roof, the thermal storage box (206) and the filling chamber (203) are connected via a water pipe, and a water pump is provided on the water pipe (11) and the water pipe.
9. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 1 or 3, characterized in that: The temperature controller (4) is electrically connected to the electric heating element (207), and the temperature sensing safety protector (5) is electrically connected to the electric heating element (207).
10. The thermal energy melting device for snow removal on the top of a greenhouse according to claim 2, characterized in that: A sealing bushing (12) is provided at the connection between the rotating shaft (202) and the main roof support rod (6), and a temperature detector (13) is fixedly connected to the side of the external upper end of the thermal storage box (206) away from the temperature controller (4).