Efficient heat supply system of solar energy coupled air source heat pump and working method

Abstract

The invention discloses an efficient heat supply system of a solar coupled air source heat pump and a working method, and relates to the technical field of heat pumps. Comprising a solar heat collection module, an air source heat pump module and a user side. The air source heat pump module comprises a rack, a plurality of evaporators are fixedly connected to the rack, and cleaning assemblies used for cleaning the evaporators are arranged on the evaporators; the cleaning assembly comprises two electric sliding rails which are fixedly connected to the evaporator, and sliding blocks of the electric sliding rails are fixedly connected with L-shaped frames; and the brush roller is rotationally connected to the L-shaped frame, and the brush roller is fixedly connected with bristles. The brush bristles are inserted into the gaps of the fins of the evaporator, deformation of the fins is limited through the brush bristles, the water flow impact force borne by the fins is improved, then the fins are washed through water flow, in this way, the cleaning effect on the fins of the evaporator is enhanced, the cleanliness of the fins of the evaporator is improved, and the working efficiency of the evaporator is kept advantageously.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a high-efficiency heating system and a working method of a solar energy coupled air source heat pump. Background Art

[0002] Solar thermal technology uses a solar thermal collection system to absorb solar energy, convert it into thermal energy, and transmit the thermal energy to the heat-using terminal through liquid working fluids such as water, antifreeze, and thermal oil. Air source heat pumps use the reverse Carnot cycle principle to absorb and convert the difficult-to-use low-grade thermal energy in the air into usable high-grade thermal energy, thereby achieving building heating or hot water supply. However, the performance coefficient of the air source heat pump system will be affected by factors such as environmental meteorological parameters, operating parameters, and control schemes during actual operation. Especially in low temperature environments, the COP and operating stability of the unit are significantly reduced due to the performance of the compressor, the performance of the outdoor heat exchanger, and the water inlet temperature of the unit.

[0003] During the heating cycle of the air source heat pump, the circulating medium in the evaporator exchanges heat with the low-grade external thermal energy, thereby realizing the utilization of the low-grade external thermal energy. However, as the use time of the air source heat pump increases, dust and other impurities will accumulate on the surface of the evaporator, causing the gap between the evaporator fins to decrease, reducing the efficiency of the external gas passing through the evaporator and exchanging heat with the circulating medium in the evaporator. The evaporator fins are currently regularly flushed with water to remove impurities adhered to the fins. Since it is necessary to prevent the fins from being deformed by the impact of the water flow during the flushing of the evaporator, the flushing force of the water flow is small, and the stubborn impurities adhered to the surface of the fins cannot be cleaned, resulting in poor cleaning effect of the evaporator and reduced heat exchange efficiency between the circulating medium in the evaporator and the low-grade external thermal energy. Summary of the invention

[0004] The present invention provides a high-efficiency heating system and working method of a solar-coupled air-source heat pump, so as to overcome the disadvantage that the existing method of using low-pressure water flow to clean the fins of a heat pump evaporator is not effective and affects the working efficiency of the evaporator.

[0005] The technical solution is: a high-efficiency heating system of solar energy coupled air source heat pump, including: A solar heat collection module, an air source heat pump module and a user end, wherein the solar heat collection module and the air source heat pump module are connected to the user end to form a heating circuit, and the air source heat pump module comprises: A frame, wherein a plurality of evaporators are fixedly connected to the frame, a condenser and a compressor are fixedly connected to the frame, an expansion valve assembly is installed in the frame, the expansion valve assembly, the evaporator, the condenser and the compressor are interconnected, and a cleaning assembly for cleaning the evaporator is provided on the evaporator, and the cleaning assembly comprises: Two electric slide rails are both fixed to the evaporator, the slider of the electric slide rail is fixed to an L-shaped frame, the two L-shaped frames are spline-connected to a water pipe, the water pipe is connected to an external water supply device through a connecting pipe, and the water pipe is fixed to and connected to a plurality of evenly distributed fan-shaped nozzles; The brush roller is rotatably connected to the L-shaped frame, and the brush roller is fixed with a plurality of evenly distributed bristles.

[0006] Furthermore, the spraying angle of the fan-shaped nozzle is 50° to 60°.

[0007] Furthermore, the minimum distance between the brush roller and the adjacent evaporator is smaller than the length of the bristles, so that the bristles can be inserted into the fin gaps of the adjacent evaporators.

[0008] Furthermore, it also includes: The guide plates, whose number is equal to that of the evaporators, are respectively fixed to one of the electric slide rails on different evaporators. The side of the guide plate close to the adjacent water pipe is a wavy surface, and the wavy surface of the guide plate contacts the adjacent water pipe for guiding the movement of the adjacent water pipe. A first spring is fixed between the water pipe and the adjacent L-shaped frame.

[0009] Furthermore, it also includes: The racks, the number of which is equal to that of the evaporators, are respectively fixed to one of the electric slide rails on different evaporators, and the racks are connected to the adjacent brush rollers through gear transmission.

[0010] Furthermore, the expansion valve assembly comprises: A valve body is installed in the frame, the valve body is provided with a liquid inlet flow channel and a liquid outlet flow channel which are connected to each other, the liquid inlet flow channel is connected to the compressor through a connecting pipe, and the liquid outlet flow channel is connected to the two evaporators through a connecting pipe, the valve body is fixedly connected to an upper valve cover, and a diaphragm is fixedly connected to the upper valve cover; A valve stem is sealingly and slidably connected to the valve body, the diaphragm is used to squeeze the valve stem, a valve core is slidably connected to the side of the valve stem away from the upper valve cover, and the valve core is used to control the communication area between the liquid inlet flow channel and the liquid outlet flow channel; A valve seat is arranged on a side of the valve core away from the upper valve cover and in contact with the valve stem, a side of the valve body away from the upper valve cover is threadedly connected to a lower valve cover, a side of the lower valve cover away from the upper valve cover is threadedly connected to a protective cap, an adjusting stud is internally threaded and sealingly slidably connected to the lower valve cover, the adjusting stud is slidably connected to a limit ring, and a second spring is fixedly connected between the limit ring and the valve seat; The connecting stud is sealingly and slidingly connected in the adjusting stud and is threadedly connected with the valve core.

[0011] Furthermore, a friction ring is fixed inside the adjusting stud, and the friction ring is in contact with the connecting stud.

[0012] Furthermore, the regulating stud is sealingly and slidably connected with a limit pin, and the limit ring limits the limit pin.

[0013] Furthermore, the adjusting stud is threadedly connected to a power shell, the power shell is sealingly and slidingly connected to a sliding column, high-pressure gas is stored between the power shell and the sliding column, the limiting pin limits the sliding column, and the sliding column is used to squeeze the connecting stud.

[0014] A working method of a high-efficiency heating system of a solar energy coupled air source heat pump is based on the above-mentioned high-efficiency heating system of a solar energy coupled air source heat pump, and specifically comprises the following steps: Step 1: When the evaporator needs to be cleaned, the electric slide rail and the water supply device are started, and the water pipe and the brush roller are driven to move along the side of the adjacent evaporator. The water supply device conveys water into the water pipe and sprays it through the fan-shaped nozzle. The water sprayed from the fan-shaped nozzle cleans the evaporator. Step 2: During the movement of the water pipe, the water pipe is guided by the guide plate to move back and forth, and the brush roller is driven by the gear and rack, so that the brush roller drives the bristles to rotate circumferentially to "brush" the fins of the evaporator; Step 3: After the water pipe and the brush roller finish cleaning the evaporator, the water supply device stops, and the electric slide rail drives the water pipe and the brush roller to reset; Step 4: When the second spring adjacent to the limit ring is damaged during the operation of the air source heat pump module, the sliding column squeezes the limit pin to move, and the limit pin squeezes the limit ring to move, so that the limit ring releases the limit on the limit pin, and the limit pin releases the limit on the sliding column; Step 5: The sliding column pushes the valve core to move to the initial setting position through the connecting stud, and the air source heat pump module runs at low power and waits for maintenance; Step 6: Remove the lower valve cover from the valve body, separate the valve core from the connecting studs, remove the valve seat from the connecting studs, and replace the second spring adjacent to the limit ring, and then remove the power housing together with the sliding column from the adjusting studs; Step 7: Install the lower valve cover to the valve body, adjust the initial opening by adjusting the studs, connect the connecting studs to the valve core threads, and install the power housing and sliding column to the adjusting studs.

[0015] Compared with the prior art, the present invention has the following advantages: the present invention inserts bristles into the fin gaps of the evaporator, uses the bristles to limit the deformation of the fins, increases the strength with which the fins can withstand the impact of water flow, and then uses the water flow to flush the fins, thereby enhancing the cleaning effect of the evaporator fins, improving the cleanliness of the evaporator fins, and helping to maintain the working efficiency of the evaporator.

[0016] By coupling the solar thermal collection module with the air source heat pump module, efficient and stable heating can be achieved, and renewable energy is fully utilized, which helps to improve the electrification and low-carbonization level in the building sector.

[0017] The guide plate is used to guide the water pipe to move back and forth, changing the angle at which the fin is impacted by the water flow, so that the water flow impacts the fin from different directions, increasing the shear force and impact force on the impurities on the fin surface, and improving the cleaning efficiency of the impurities adhering to the fin surface.

[0018] The brush roller is guided by a rack to drive the bristles to rotate. Before the evaporator is cleaned by water flow, the flocculent impurities adhering to the surface of the evaporator are cleaned, thereby reducing the probability of impurities on the surface of the evaporator being washed into the fin gap by the water flow and improving the overall cleaning effect.

[0019] The change in the reaction force of the second spring on the limit ring triggers the movement of the sliding column, thereby keeping the valve core at the initially set minimum opening after the second spring is damaged, allowing the heat pump system to operate at low efficiency, preventing excessive circulating medium from entering the evaporator, and reducing the probability of "liquid hammer" in the compressor, thereby providing protection for the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a working principle diagram of the high-efficiency heating system of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the evaporator, condenser and compressor of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the L-shaped frame, water pipe and fan-shaped nozzle of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the L-shaped frame, guide plate and rack of the present invention; Figure 6 It is a three-dimensional structural cross-sectional view of the valve body and the upper valve cover of the present invention; Figure 7 It is a three-dimensional structural cross-sectional view of the valve body, valve seat and lower valve cover of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the valve stem and the connecting stud of the present invention; Fig. 9It is a three-dimensional structural cross-sectional view of the lower valve cover and the adjusting stud of the present invention; Fig.10 It is a three-dimensional structural cross-sectional view of the adjusting stud and the power shell of the present invention.

[0021] Names and serial numbers of parts in the figure: 100-solar thermal collector module, 200-air source heat pump module, 300-user end, 1-frame, 2-evaporator, 3-condenser, 4-compressor, 5-electric slide rail, 6-L-shaped frame, 7-water pipe, 8-fan-shaped nozzle, 9-brush roller, 10-bristles, 11-guide plate, 12-rack, 13-valve body, 131-liquid inlet channel, 132-liquid outlet channel, 133-pressure sensing chamber, 14-upper valve cover, 15-diaphragm, 16-valve stem, 17-valve core, 18-valve seat, 19-lower valve cover, 20-protective cap, 21-adjusting stud, 22-limiting ring, 23-connecting stud, 24-friction ring, 25-limiting pin, 26-power shell, 27-sliding column. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0023] A high-efficiency heating system with solar energy coupled to air source heat pump, please refer to Figure 1-Figure 5 , including: a solar thermal collector module 100, an air source heat pump module 200 and a user end 300, the solar thermal collector module 100 and the air source heat pump module 200 are connected to the user end 300 to form a heating circuit, the air source heat pump module 200 includes: a frame 1, the frame 1 is fixedly connected with a plurality of evaporators 2, the frame 1 is fixedly connected with a condenser 3 and a compressor 4, the frame 1 is installed with an expansion valve assembly, the expansion valve assembly, the evaporator 2, the condenser 3 and the compressor 4 are interconnected, the evaporator 2 is provided with a cleaning assembly for cleaning it, and the cleaning assembly includes: two electric The slide rails 5 are all fixedly connected to the evaporator 2. The slider of the electric slide rail 5 is fixedly connected to an L-shaped frame 6. The two L-shaped frames 6 are commonly splined with a water pipe 7. The water pipe 7 is connected to an external water supply device through a connecting pipe. The water pipe 7 is fixedly connected and connected to a plurality of evenly distributed fan-shaped nozzles 8; the brush roller 9 is rotatably connected to the L-shaped frame 6. The brush roller 9 is fixedly connected to a plurality of evenly distributed bristles 10; the spraying angle of the fan-shaped nozzle 8 is 50° to 60°; the minimum distance between the brush roller 9 and the adjacent evaporator 2 is less than the length of the bristles 10, so that the bristles 10 can be inserted into the fin gap of the adjacent evaporator 2.

[0024] The above scheme aims to solve the problem that the existing low-pressure water flow is not effective in cleaning the fins of the heat pump evaporator 2, which affects the working efficiency of the evaporator 2; this scheme inserts the bristles 10 into the fin gap of the evaporator 2, uses the bristles 10 to limit the deformation of the fins, and increases the strength of the fins that can withstand the impact of water flow, and then uses high-pressure water flow to flush the fins, thereby enhancing the cleaning effect of the evaporator 2 fins, improving the cleanliness of the evaporator 2 fins, and helping to maintain the working efficiency of the evaporator 2; this scheme couples the solar thermal collection module 100 with the air source heat pump module 200 to achieve efficient and stable heating, and makes full use of renewable energy, which helps to improve the level of electrification and low carbonization in the construction field.

[0025] The solar thermal collection module 100 can adopt a trough type thermal collection system, a tower type thermal collection system, a Fresnel type thermal collection system, etc., and its function is to convert solar energy into thermal energy and transmit the thermal energy to the user end 300 through a liquid working fluid; the solar thermal collection module 100 is equipped with a heat storage tank, and the liquid working fluid therein absorbs heat at the solar thermal collection device and first stores the heat in the heat storage tank. The function of the heat storage tank is to store heat and regulate and balance the system water pressure, that is, to store excess thermal energy when solar energy is sufficient, and to release the stored thermal energy when demand peaks or solar energy is insufficient, so as to ensure the continuity and stability of the heating system; the solar thermal collection module 100 and the air source heat pump module 200 are coupled through a heat exchanger; the liquid working fluid in the solar thermal collection module 100 is not in direct contact with the circulating medium in the air source heat pump module 200.

[0026] The evaporator 2 (an existing device, the number of which is not limited, the number is two in this article, and the fins on it are not shown in the attached figure), the condenser 3, the compressor 4 and the expansion valve assembly are interconnected and form a heat pump system (this is an existing system, and no excessive display is made in the attached figure); each evaporator 2 can correspond to one or two electric slide rails 5, and when corresponding to one electric slide rail 5, the other side is replaced by a guide rail; the water pipe 7 is connected to the external water supply device through a connecting pipe; the number of fan-shaped nozzles 8 is determined according to factors such as the distance between them and the evaporator 2 and the spray angle. The direction of the water flow sprayed by the fan-shaped nozzle 8 is in the same plane as the central axis of the water pipe 7; the spray angle of the fan-shaped nozzle 8 in this article is 50°, so that the maximum angle between the fan-shaped nozzle 8 and the fin is 2 5° (if the above angle is too large or too small, the energy of the water flow may be lost due to reflection or dispersion, resulting in reduced cleaning efficiency). At this angle, the kinetic energy of the water flow can be more concentratedly transferred to the impurity roots of the fins, thereby improving the cleaning effect of the impurities. At the same time, the component force of the water flow impacting the fins is small, reducing the probability of fin deformation. The minimum distance between the brush roller 9 and the adjacent evaporator 2 is less than the length of the bristles 10, so that when the brush roller 9 rotates, the bristles 10 can be inserted into the fin gap to support the fin, and the bristles 10 will not hinder the water flow sprayed from the fan-shaped nozzle 8. The diameter of the bristles 10 is smaller than the fin gap, and the bristles 10 have a plurality of groups. The bristles 10 in each group are evenly distributed circumferentially, and the number of groups of bristles 10 is greater than the number of fin gaps on the evaporator 2.

[0027] Please refer to Figure 5 , further comprising: a number of guide plates 11 equal to that of the evaporators 2, respectively fixed to one of the electric slide rails 5 on different evaporators 2, a side of the guide plate 11 close to the adjacent water pipe 7 being a wave surface, and the wave surface of the guide plate 11 contacts the adjacent water pipe 7, for guiding the adjacent water pipe 7 to move, a first spring being fixed between the water pipe 7 and the adjacent L-shaped frame 6; a number of racks 12 equal to that of the evaporators 2, respectively fixed to one of the electric slide rails 5 on different evaporators 2, the racks 12 and the adjacent brush rollers 9 being driven by gears.

[0028] In the above scheme, the guide plate 11 is used to guide the water pipe 7 to move back and forth, change the angle at which the fin is impacted by the water flow, make the water flow impact the fin from different directions, increase the shear force and impact force on the impurities on the surface of the fin, and improve the cleaning efficiency of the impurities adhering to the surface of the fin; the rack 12 is used to guide the brush roller 9 to drive the bristles 10 to rotate, and before the evaporator 2 is cleaned by the water flow, the flocculent impurities adhering to the surface of the evaporator 2 are cleaned, thereby reducing the probability that the impurities on the surface of the evaporator 2 are washed into the fin gap by the water flow, and improving the overall cleaning efficiency; the brush roller 9 is located below the adjacent water pipe 7, and in the direction of the central axis of the water pipe 7, the distance between the crest and the trough of the wave surface on the guide plate 11 is equal to half of the width that the water flow sprayed by the fan-shaped nozzle 8 can cover on the surface of the evaporator 2, so that the front and rear sides of the fins on the evaporator 2 can be cleaned by the water flow; the side of the water pipe 7 in contact with the wave surface of the guide plate 11 is an arc surface, which is used to reduce the resistance when the two slide.

[0029] The working principle of the above scheme is as follows: when the solar radiation intensity is high (above 500W / m2), the solar thermal collector module 100 is used to heat the user end 300 alone. When the solar radiation intensity is low (below 500W / m2 or there is no solar radiation, such as at night or in rainy weather), there are two situations: one is that the temperature of the liquid working medium in the heat storage tank of the solar thermal collector module 100 is higher than the temperature required for heating the user end 300. At this time, the liquid working medium in the heat storage tank is used to heat the user end 300. 0 heating, during this process, the air source heat pump module 200 serves as an auxiliary heat source of the solar thermal collection module 100, and preferentially uses the heat of the solar thermal collection module 100 for heating. When the solar thermal collection module 100 does not provide sufficient heat, the air source heat pump module 200 is turned on to assist in heating. Secondly, the temperature of the liquid working medium in the heat storage tank of the solar thermal collection module 100 is lower than the temperature required for heating the user end 300. In this case, only the air source heat pump module 200 is used to provide heating for the user end 300.

[0030] After the air source heat pump module 200 has been running for a period of time (the period of time here is determined by the local air quality), the amount of impurities adhered to the surface of the evaporator 2 increases, and at this time the electric slide rail 5 and the external water supply device are started (hereinafter taking the left set of cleaning components as an example, the left and right sets of cleaning components are operated alternately), and the water supply device transports the water flow to the water pipe 7 through the connecting pipe, and sprays it through all the fan-shaped nozzles 8. The fan-shaped water flow formed by two adjacent fan-shaped nozzles 8 partially overlaps at the position where it contacts the evaporator 2, and the water flow impacts the side of the fin and enters the fin gap; the slider of the electric slide rail 5 drives the L-shaped frame 6 to move to the lower right, and the L-shaped frame 6 drives the water pipe 7 and the brush roller 9 to move together.

[0031] During the movement of the brush roller 9, the brush roller 9 is driven by the gear and the adjacent rack 12, so that the brush roller 9 rotates counterclockwise (the rotation direction of this article is shown in FIG. Figure 2Taking the front view direction as an example), the brush roller 9 drives all the bristles 10 thereon to rotate circumferentially, so that part of the bristles 10 pass through the fin gaps of the evaporator 2, and relative sliding occurs between the bristles 10 and the fins. The movement of the bristles 10 combined with the impact of the water flow improves the cleaning effect of the stubborn impurities in the fin gaps.

[0032] During the movement of the water pipe 7, the water pipe 7 slides along the side of the guide plate 11 and moves back and forth under the guidance of the guide plate 11, reciprocatingly compressing the first spring adjacent to the water pipe 7, so that the angle between the fan-shaped water flow sprayed by the fan-shaped nozzle 8 and the fin changes reciprocatingly, so that the water flow cleans the front and back sides of the fin respectively, and at the same time reciprocates to change the angle of the water flow impacting the stubborn impurities on the fin, thereby improving the cleaning efficiency of the stubborn impurities on the fin surface.

[0033] When the slider on the electric slide rail 5 moves to the lower limit position, a cleaning process of the evaporator 2 is completed. At this time, the water supply device stops, and the slider on the electric slide rail 5 starts to move to the upper left, and drives the water pipe 7 and the brush roller 9 to move through the L-shaped frame 6. Finally, the L-shaped frame 6, the water pipe 7 and the brush roller 9 are reset, waiting for the next cleaning.

[0034] Please refer to Figure 3 and Figure 6-Figure 10 The expansion valve assembly includes: a valve body 13, which is installed in the frame 1. The valve body 13 is provided with an inlet flow channel 131 and an outlet flow channel 132 which are connected to each other. The inlet flow channel 131 is connected to the compressor 4 through a connecting pipe, and the outlet flow channel 132 is connected to the two evaporators 2 through a connecting pipe. The valve body 13 is fixedly connected with an upper valve cover 14, and a diaphragm 15 is fixedly connected in the upper valve cover 14; a valve stem 16 is sealingly slidably connected in the valve body 13, and the diaphragm 15 is used to squeeze the valve stem 16. The side of the valve stem 16 away from the upper valve cover 14 is slidably connected with a valve core 17, and the valve core 17 is used to control the communication area between the inlet flow channel 131 and the outlet flow channel 132; a valve seat 18 is arranged on the side of the valve core 17 away from the upper valve cover 14 and contacts the valve stem 16. The side of the valve body 13 away from the upper valve cover 14 is threadedly connected with a lower valve cover 19, and the lower valve cover 1 A protective cap 20 is threadedly connected to the side away from the upper valve cover 14, and an adjusting stud 21 is threadedly connected to the lower valve cover 19 in a sealing and sliding manner. The adjusting stud 21 is slidably connected to a limit ring 22, and a second spring is fixedly connected between the limit ring 22 and the valve seat 18; a connecting stud 23 is sealingly slidably connected in the adjusting stud 21 and threadedly connected to the valve core 17; a friction ring 24 is fixedly connected in the adjusting stud 21, and the friction ring 24 is in contact with the connecting stud 23; the adjusting stud 21 is sealingly slidably connected to a limit pin 25, and the limit ring 22 limits the limit pin 25; the adjusting stud 21 is threadedly connected to a power shell 26, and the power shell 26 is sealingly slidably connected to a sliding column 27, high-pressure gas is stored between the power shell 26 and the sliding column 27, the limit pin 25 limits the sliding column 27, and the sliding column 27 is used to squeeze the connecting stud 23.

[0035] The expansion valve is a key component in the heat pump system for regulating the flow and pressure of the refrigerant to ensure efficient and stable operation of the heat pump system. During use, the expansion valve may fail due to metal fatigue, resonance, electrochemical corrosion and other reasons, resulting in the failure of the spring inside the expansion valve, causing the expansion valve to be unable to adjust the opening by itself, so that excessive refrigerant enters the evaporator 2, causing the evaporator 2 to be overloaded, and the evaporator 2 cannot vaporize the refrigerant in time, causing liquid refrigerant to enter the compressor 4, causing "liquid hammer" phenomenon, and finally causing the compressor 4 to be damaged; the above scheme is intended to solve the problem that the compressor 4 is damaged after the failure of the internal spring of the existing expansion valve; in this scheme, the movement of the sliding column 27 is triggered by the change of the reaction force of the second spring adjacent to the limit ring 22 on the limit ring 22, so that the valve core 17 is maintained at the initial minimum opening after the second spring adjacent to the limit ring 22 is damaged, so that the heat pump system operates at a low efficiency, prevents excessive circulating medium from entering the evaporator 2, and thus reduces the probability of "liquid hammer" phenomenon in the compressor 4, providing protection for the compressor 4.

[0036] The upper valve cover 14 and the diaphragm 15 cooperate to form a temperature-sensing chamber, which is connected to the temperature-sensing package through a thin connecting tube (the temperature-sensing package is an existing part and is not shown in the attached figure). The temperature-sensing package is used to sense the temperature of the circulating medium at the outlet of the evaporator 2 and change the pressure in the temperature-sensing chamber through the thin connecting tube; the valve body 13 and the upper valve cover 14 form a pressure-sensing chamber 133, which is connected to the outlet of the evaporator 2 through a connecting tube and is used to sense the pressure at the outlet of the evaporator 2; the movement of the valve stem 16 is jointly affected by the pressure in the temperature-sensing chamber, the pressure in the pressure-sensing chamber 133 and the elastic force of the second spring adjacent to the valve seat 18. This is an existing structure and will not be described in detail here; initially, the valve core 17 and There is a minimum gap between the valve body 13 (i.e., the opening of the expansion valve, and the size of the gap between the valve core 17 and the valve body 13 will be described by the size of the opening later). This gap is set by the maintenance personnel and can be set by rotating the adjusting stud 21 to adjust the compression of the second spring adjacent to the limit ring 22; the pressure in the temperature sensing chamber is used to push the valve stem 16 downward to increase the opening, and the second spring adjacent to the pressure sensing chamber 133 and the limit ring 22 is used to push the valve stem 16 upward to reduce the opening. During the initial and normal operation, the above three forces are always kept in a balanced state, thereby realizing self-adjustment of the expansion valve opening; the second spring adjacent to the limit ring 22 is initially in a compressed and stored force state.

[0037] A bayonet is provided on the lower side of the adjusting stud 21, and maintenance personnel can use a flat-blade screwdriver to rotate the adjusting stud 21. A cross groove is provided on the lower side of the connecting stud 23 and the power shell 26, and maintenance personnel can use a cross screwdriver to rotate the connecting stud 23 and the power shell 26; the inner side of the limit ring 22 is an annular inclined surface, and the angle between the generatrix of the inclined surface and the central axis of the limit ring 22 is less than 45°, and in the vertical downward direction, the inner diameter of the annular inclined surface on the inner side of the limit ring 22 gradually increases, and the side where the limit pin 25 contacts the limit ring 22 matches the annular inclined surface of the limit ring 22; the upper part of the sliding column 27 is a truncated cone, and its generatrix is ​​aligned with the central axis The line angle is greater than 45°, and in the vertical upward direction, the outer diameter of the upper cone of the sliding column 27 gradually decreases, and the contact position between the limit pin 25 and the sliding column 27 matches the cone shape of the sliding column 27; the setting of the above two angles makes the thrust of the high-pressure gas in the power shell 26 on the sliding column 27 greater than the elastic force of the adjacent second spring of the limit ring 22; the friction ring 24 is made of elastic material, and the state in the accompanying drawing is the state of the friction ring 24 after being vertically compressed. The friction ring 24 is used to remind maintenance personnel during the installation of the connecting stud 23: the connecting stud 23 has reached the appropriate position, and initially the connecting stud 23 is located at the upper limit position in the adjusting stud 21.

[0038] The working principle of the above scheme is as follows: during the operation of the air source heat pump module 200, the compressor 4 transports the circulating medium to the liquid inlet channel 131 through the connecting pipe, and the circulating medium in the liquid inlet channel 131 flows to the liquid outlet channel 132 through the gap between the valve body 13 and the valve core 17. During this process, the pressure of the circulating medium decreases, and at the same time, the pressure in the temperature sensing chamber changes synchronously according to the temperature of the connecting pipe at the outlet of the evaporator 2. When the circulating medium passes through the gap between the valve body 13 and the valve core 17, it will give the valve core 17 a downward impact force; during the operation of the air source heat pump module 200, when the opening needs to be increased, the force applied by the temperature sensing chamber to the valve stem 16 through the diaphragm 15 increases, so that the valve The stem 16 moves downward, the valve stem 16 squeezes the valve seat 18 downward, and compresses the second spring adjacent to the valve seat 18. The valve core 17 moves downward with the valve stem 16 and the valve seat 18 under the action of gravity and the impact force given by the circulating medium, so that the opening increases, and finally the above three forces are balanced again; when the opening needs to be reduced, the force applied to the valve stem 16 by the diaphragm 15 by the temperature sensing chamber is reduced, and the second spring adjacent to the valve seat 18 pushes the valve seat 18 upward, and the valve seat 18 pushes the valve core 17 and the valve stem 16 to move upward together, so that the opening is reduced, and finally the above three forces are balanced again; in the above process, the valve core 17 drives the connecting stud 23 to move, so that the connecting stud 23 slides up and down in the adjusting stud 21.

[0039] When the second spring adjacent to the valve seat 18 suddenly fails, the downward extrusion force of the second spring on the limit ring 22 is reduced, and the sliding column 27, under the action of the high-pressure gas inside the power shell 26, squeezes the limit pin 25 through the round table on its upper part to move horizontally, so that the limit pin 25 gradually releases the limit on the sliding column 27, and the limit pin 25 squeezes the annular inclined surface inside the limit ring 22, so that the limit ring 22 moves upward relative to the adjusting stud 21, and the limit ring 22 gradually releases the limit on the limit pin 25. After the limit pin 25 releases the limit on the sliding column 27, the sliding column 27 moves upward and pushes the connecting stud 23 upward, so that the connecting stud 23 drives the valve core 17 to move upward, and relative sliding occurs between the valve core 17 and the valve stem 16. Finally, the gap between the valve body 13 and the valve core 17 returns to the initial set size. In this state, the air source heat pump module 200 operates at a low efficiency. After the maintenance personnel feel that the heating efficiency of the air source heat pump module 200 is reduced, they shut it down for inspection and repair, and repair the expansion valve assembly.

[0040] The process of repairing the expansion valve assembly (i.e., replacing the second spring adjacent to the limit ring 22) is as follows: the maintenance personnel use tools to disconnect the inlet flow channel 131 and the outlet flow channel 132 from the heat pump system, and then use tools to remove the protective cap 20 and the lower valve cover 19 in turn, wherein the lower valve cover 19 will drive the adjusting stud 21, the limit ring 22, the connecting stud 23, the friction ring 24, the limit pin 25, the power shell 26 and the sliding column 27 to separate from the valve body 13, and the connecting stud 23 drives the valve core 17, the valve seat 18 and the valve seat 18 to separate through the thread during the separation process. The maintenance personnel then separate the valve core 17 from the connecting stud 23, remove the valve seat 18 from the connecting stud 23, and replace the second spring adjacent to the valve seat 18; the maintenance personnel then remove the power shell 26 together with the sliding column 27 from the adjusting stud 21, and reset the limit ring 22 and the limit pin 25, and then install the valve core 17 to the valve stem 16, and sequentially sleeve the second spring adjacent to the valve seat 18 and the valve seat 18 on the connecting stud 23, and use tools to reinstall the lower valve cover 19 to the valve body 13.

[0041] In the process of installing the lower valve cover 19 to the valve body 13, the lower valve cover 19 moves up along the thread, and the valve seat 18 first contacts the valve core 17 and the valve stem 16 and then stops moving. As the lower valve cover 19 continues to move up under the action of the thread, the distance between the valve seat 18 and the limit ring 22 gradually decreases, and the second spring adjacent to the valve seat 18 is compressed. After the lower valve cover 19 is installed in place, the maintenance personnel use a tool to rotate the adjusting stud 21 to adjust the initial compression amount of the second spring adjacent to the valve seat 18, that is, to adjust the initial opening. After the opening is adjusted, the maintenance personnel use a tool to push the connecting stud 23 upward, and the connecting stud 23 slides upward in the adjusting stud 21 and contacts the threaded hole of the valve core 17, and then uses a tool to rotate the connecting stud 21. Column 23, so that the connecting stud 23 is gradually screwed into the valve core 17. During this process, the connecting stud 23 gradually moves up, and the distance between it and the friction ring 24 gradually decreases. Finally, the friction ring 24 contacts the connecting stud 23. At this time, the maintenance personnel feel that the resistance to the rotation of the connecting stud 23 increases and stops rotating. The connecting stud 23 is installed in place. Then the maintenance personnel install the power shell 26 and the sliding column 27 into the adjusting stud 21 and reset it (that is, the sliding column 27 is fitted with the limit pin 25, and the pressure of the high-pressure gas between the power shell 26 and the sliding column 27 is restored). At this point, the maintenance work on the expansion valve assembly is completed, and the maintenance personnel make the liquid inlet channel 131 and the liquid outlet channel 132 re-connected with the air source heat pump module 200.

[0042] Please refer to Figure 1-Figure 10 A working method of a high-efficiency heating system of a solar energy coupled air source heat pump is based on the above-mentioned high-efficiency heating system of a solar energy coupled air source heat pump, specifically comprising the following steps: Step 1: When the evaporator 2 needs to be cleaned, the electric slide rail 5 and the water supply device are started, and the water pipe 7 and the brush roller 9 are driven to move along the side of the adjacent evaporator 2. The water supply device conveys water into the water pipe 7 and sprays it through the fan-shaped nozzle 8. The water sprayed from the fan-shaped nozzle 8 cleans the evaporator 2. Step 2: During the movement of the water delivery pipe 7, the water delivery pipe 7 is guided by the guide plate 11 to reciprocate, and the brush roller 9 is driven by the gear and the rack 12, so that the brush roller 9 drives the bristles 10 to rotate circumferentially to "brush" the fins of the evaporator 2; Step 3: After the water pipe 7 and the brush roller 9 finish cleaning the evaporator 2, the water supply device stops, and the electric slide rail 5 drives the water pipe 7 and the brush roller 9 to reset; Step 4: When the second spring adjacent to the limit ring 22 is damaged during the operation of the air source heat pump module 200, the sliding column 27 squeezes the limit pin 25 to move, and the limit pin 25 squeezes the limit ring 22 to move, so that the limit ring 22 releases the limit on the limit pin 25, and the limit pin 25 releases the limit on the sliding column 27; Step 5: The sliding column 27 pushes the valve core 17 to move through the connecting stud 23, so that the valve core 17 moves to the initial setting position, and the air source heat pump module 200 runs at low power and waits for maintenance; Step 6: Remove the lower valve cover 19 from the valve body 13, separate the valve core 17 from the connecting stud 23, remove the valve seat 18 from the connecting stud 23, and replace the second spring adjacent to the limit ring 22, and then remove the power housing 26 together with the sliding column 27 from the adjusting stud 21; Step 7: Install the lower valve cover 19 to the valve body 13 , and adjust the initial opening by adjusting the stud 21 , threadably connect the connecting stud 23 to the valve core 17 , and install the power housing 26 and the sliding column 27 to the adjusting stud 21 .

[0043] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. 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 embodiments of the present invention.

Claims

1. A high-efficiency heating system of solar energy coupled air source heat pump, characterized in that: include: A solar heat collection module (100), an air source heat pump module (200) and a user end (300), wherein the solar heat collection module (100) and the air source heat pump module (200) are both connected to the user end (300) to form a heating circuit, and the air source heat pump module (200) comprises: A frame (1), wherein the frame (1) is fixedly connected to a plurality of evaporators (2), a condenser (3) and a compressor (4) are fixedly connected inside the frame (1), an expansion valve assembly is installed inside the frame (1), the expansion valve assembly, the evaporator (2), the condenser (3) and the compressor (4) are interconnected, and a cleaning assembly for cleaning the evaporator (2) is provided on the evaporator (2), the cleaning assembly comprising: Two electric slide rails (5) are both fixedly connected to the evaporator (2); a slider of the electric slide rail (5) is fixedly connected to an L-shaped frame (6); the two L-shaped frames (6) are commonly splined to a water pipe (7); the water pipe (7) is connected to an external water supply device via a connecting pipe; the water pipe (7) is fixedly connected to and connected to a plurality of evenly distributed fan-shaped nozzles (8); The brush roller (9) is rotatably connected to the L-shaped frame (6), and the brush roller (9) is fixed with a plurality of evenly distributed bristles (10).

2. A high-efficiency heating system of a solar-coupled air-source heat pump according to claim 1, characterized in that: The fan-shaped spray nozzle (8) has a spraying angle of 50° to 60°.

3. A high-efficiency heating system of a solar-coupled air-source heat pump according to claim 2, characterized in that: The minimum distance between the brush roller (9) and the adjacent evaporator (2) is smaller than the length of the bristles (10), so that the bristles (10) can be inserted into the gap between the fins of the adjacent evaporator (2).

4. A high-efficiency heating system of a solar-coupled air-source heat pump according to claim 3, characterized in that: Also includes: The guide plates (11) are equal in number to the evaporators (2), and are respectively fixed to one of the electric slide rails (5) on different evaporators (2); a side of the guide plate (11) close to the adjacent water pipe (7) is a wave surface, and the wave surface of the guide plate (11) is in contact with the adjacent water pipe (7) for guiding the adjacent water pipe (7) to move; a first spring is fixed between the water pipe (7) and the adjacent L-shaped frame (6).

5. A high-efficiency heating system of a solar-coupled air-source heat pump according to claim 4, characterized in that: Also includes: The racks (12) are equal in number to the evaporators (2), and are respectively fixed to one of the electric slide rails (5) on different evaporators (2). The racks (12) and the adjacent brush rollers (9) are driven by gears.

6. A high-efficiency heating system of a solar-coupled air-source heat pump according to claim 5, characterized in that: The expansion valve assembly comprises: A valve body (13) is installed in the frame (1), the valve body (13) is provided with a liquid inlet flow channel (131) and a liquid outlet flow channel (132) which are connected to each other, the liquid inlet flow channel (131) is connected to the compressor (4) through a connecting pipe, and the liquid outlet flow channel (132) is connected to the two evaporators (2) through a connecting pipe, the valve body (13) is fixedly connected to an upper valve cover (14), and a diaphragm (15) is fixedly connected to the upper valve cover (14); A valve stem (16) is sealingly and slidably connected in the valve body (13); the diaphragm (15) is used to squeeze the valve stem (16); a side of the valve stem (16) away from the upper valve cover (14) is slidably connected to a valve core (17); the valve core (17) is used to control the communication area between the liquid inlet flow channel (131) and the liquid outlet flow channel (132); A valve seat (18) is arranged on a side of the valve core (17) away from the upper valve cover (14) and in contact with the valve stem (16); a side of the valve body (13) away from the upper valve cover (14) is threadedly connected to a lower valve cover (19); a side of the lower valve cover (19) away from the upper valve cover (14) is threadedly connected to a protective cap (20); an adjusting stud (21) is internally threaded and sealingly slidably connected to the lower valve cover (19); the adjusting stud (21) is slidably connected to a limit ring (22); a second spring is fixedly connected between the limit ring (22) and the valve seat (18); The connecting stud (23) is sealingly slidably connected in the adjusting stud (21) and is threadedly connected to the valve core (17).

7. A high-efficiency heating system of a solar-coupled air-source heat pump according to claim 6, characterized in that: A friction ring (24) is fixedly connected inside the adjusting stud (21), and the friction ring (24) is in contact with the connecting stud (23).

8. A high-efficiency heating system of solar energy coupled air source heat pump according to claim 7, characterized in that: The adjusting stud (21) is sealingly and slidably connected to the limit pin (25), and the limit ring (22) limits the limit pin (25).

9. A high-efficiency heating system of solar energy coupled air source heat pump according to claim 8, characterized in that: The adjusting stud (21) is threadedly connected to a power shell (26), and the power shell (26) is sealingly and slidably connected to a sliding column (27). High-pressure gas is stored between the power shell (26) and the sliding column (27). The limiting pin (25) limits the sliding column (27), and the sliding column (27) is used to squeeze the connecting stud (23).

10. A working method of a high-efficiency heating system of a solar-energy-coupled air-source heat pump, according to the high-efficiency heating system of a solar-energy-coupled air-source heat pump of claim 9, characterized in that: The specific steps include: Step 1: When the evaporator (2) needs to be cleaned, the electric slide rail (5) and the water supply device are started, and the water pipe (7) and the brush roller (9) are driven to move along the side of the adjacent evaporator (2). The water supply device conveys water into the water pipe (7) and sprays it through the fan-shaped nozzle (8). The water sprayed from the fan-shaped nozzle (8) cleans the evaporator (2); Step 2: During the movement of the water delivery pipe (7), the water delivery pipe (7) is guided by the guide plate (11) to move back and forth, and the brush roller (9) is driven by the gear and the rack (12), so that the brush roller (9) drives the bristles (10) to rotate in a circumferential direction to "brush" the fins of the evaporator (2); Step 3: After the water pipe (7) and the brush roller (9) have finished cleaning the evaporator (2), the water supply device stops, and the electric slide rail (5) drives the water pipe (7) and the brush roller (9) to reset; Step 4: When the second spring adjacent to the limit ring (22) is damaged during the operation of the air source heat pump module (200), the sliding column (27) squeezes the limit pin (25) to move, and the limit pin (25) squeezes the limit ring (22) to move, so that the limit ring (22) releases the limit on the limit pin (25), and the limit pin (25) releases the limit on the sliding column (27); Step 5: The sliding column (27) pushes the valve core (17) to move via the connecting stud (23), so that the valve core (17) moves to the initial setting position, and the air source heat pump module (200) operates at low power and waits for maintenance; Step 6: Remove the lower valve cover (19) from the valve body (13), separate the valve core (17) from the connecting stud (23), remove the valve seat (18) from the connecting stud (23), and replace the second spring adjacent to the limit ring (22), and then remove the power housing (26) together with the sliding column (27) from the adjusting stud (21); Step 7: Install the lower valve cover (19) to the valve body (13), adjust the initial opening by adjusting the stud (21), thread the connecting stud (23) to the valve core (17), and install the power housing (26) and the sliding column (27) to the adjusting stud (21).

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