Pressure-bearing direct-heating water heating system

Abstract

The invention discloses a pressure-bearing direct-heating water heating system which comprises a dual-mode variable-frequency heat pump unit, a pressure-bearing water storage tank, an electric three-way valve, a unit circulating pump and a water return pump. When the pressure-bearing direct-heating water heating system is used, the dual-mode variable-frequency heat pump unit adopts a variable-flow variable-temperature-difference heating mode, and outlet water is always kept at the set outlet water temperature during heating; the dual-mode variable-frequency heat pump unit is controlled to start and stop according to the temperature of the pressure-bearing water storage tank, when the temperature of the pressure-bearing water storage tank is lower than the set temperature, the dual-mode variable-frequency heat pump unit is started for heating, at the moment, the three-way valve AB-A is opened, directly-heated outlet water is prevented from being mixed, and when the water consumption of the tail end is smaller than the water outlet amount of the unit, hot water can be directly supplied by the unit. When the use amount of the tail end is larger than the water yield of the unit, the unit and the pressure-bearing water storage tank jointly supply water to the outside, water discharged from the unit can be directly supplied to the outside at the moment, the problem that water supply of a traditional heat pump system is not stable is solved, and meanwhile during defrosting, the electric three-way valve AB-B is switched, and the influence of the unit on the water temperature of the whole system is avoided.

Description

Technical Field

[0001] This invention relates to the field of thermal energy technology, specifically to a pressurized direct-heating hot water system. Background Technology

[0002] Conventional circulating heat pump units operate on a high-flow, low-temperature-difference heating mode. During pressurized water supply periods, especially with high-flow water supply, the heat pump unit starts and circulates at a high flow rate. This actually accelerates the mixing of cold water with the existing hot water in the tank, causing a rapid drop in the tank's water temperature and making it impossible to provide a stable hot water supply. Additionally, the defrosting process of the heat pump unit also causes a drop in the overall system water temperature.

[0003] Therefore, a pressurized direct-heating hot water system is proposed to solve the above problems. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the defects of the prior art and provide a pressurized direct-heating hot water system.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressurized direct-heating hot water system, comprising a dual-mode variable frequency heat pump unit, a pressurized water storage tank, an electric three-way valve, a unit circulation pump, and a return water pump. Two pressurized water storage tanks are provided, arranged side-by-side, and connected by a connecting pipeline. The electric three-way valve is installed in the pipeline between the dual-mode variable frequency heat pump unit and the two pressurized water storage tanks. The unit circulation pump is installed in the pipeline between the dual-mode variable frequency heat pump unit and the right-side pressurized water storage tank. A cold water supply pipe is installed on the right-side pressurized water storage tank. The system includes a hot water return pipeline on the cold water supply pipeline, a return water pump on the hot water return pipeline, a hot water supply pipeline on the pressure tank on the left side, two symmetrical support seats at the bottom of each pressure tank, and a common base fixedly connected to the bottom of each support seat. Both pressure tanks have protective mechanisms on their outer sides to block debris in the event of an explosion. Both pressure tanks also have descaling mechanisms inside their cavities to clean scale deposits on the inner walls of the tanks.

[0006] Preferably, the protective mechanism includes two transverse baffles and a longitudinal baffle. The two transverse baffles are located on the left and right sides of the pressurized water tank, respectively. Each of the two transverse baffles has a first square slot. A matching first square strip slides through the inner cavity of each of the two first square slots. A first fixing hole is provided on the first square strip. A first horizontal plate is fixedly connected to the opposite side of each of the two transverse baffles. A first L-shaped rod slides through the first horizontal plate. The longest ends of the two first L-shaped rods respectively pass through the inner cavity of the adjacent first fixing hole. A first spring is sleeved on the outer wall of each of the two first L-shaped rods. The two ends of the first spring are fixedly connected to the first L-shaped rod and the first horizontal plate, respectively. A first square hole is horizontally provided on each of the two support seats. A matching first T-shaped square rod slides through the inner cavity of the first square hole. The longest ends of the two first T-shaped square rods are fixedly connected to the adjacent first square strip, respectively. A second spring is sleeved on the outer wall of each of the two first T-shaped square rods. The two ends of the second spring are fixedly connected to the first T-shaped square rod and the support seat, respectively. The two longitudinal baffles are located on the front and rear sides of the pressurized water storage tank, respectively. Each of the two longitudinal baffles has a second square slot, through which a matching second square bar slides. The second square bar has a second fixing hole. A second horizontal plate is fixedly connected to the opposite side of each of the two longitudinal baffles, and a second L-shaped rod slides through the second horizontal plate. The longest ends of the two second L-shaped rods pass through the inner cavities of adjacent second fixing holes. A third spring is fitted onto the outer wall of each of the two second L-shaped rods, and both ends of the third spring are fixedly connected to the second L-shaped rod and the second horizontal plate, respectively. Vertical plates are provided on the front and rear sides of the two support bases, and the vertical plates are fixedly connected to the base. Each vertical plate has a second square hole, through which a matching second T-shaped rod slides. The longest end of each second T-shaped rod is fixedly connected to an adjacent second square bar. A fourth spring is fitted onto the outer wall of each second T-shaped rod, and both ends of the fourth spring are fixedly connected to the second T-shaped rod and the vertical plate, respectively.

[0007] Preferably, the bottom of the first square bar and the second square bar are respectively rotatably connected to a first roller and a second roller, and the first roller and the second roller are both fitted and disposed on the top of the base.

[0008] Preferably, the descaling mechanism includes a connecting seat, which is fixedly connected to the right side of the pressurized water tank. A servo motor is mounted on the connecting seat, and a first sealed bearing is provided on the connecting seat. The inner cavity of the pressurized water tank is provided with a cylindrical movable seat, and a threaded hole is opened at the center of the cylindrical movable seat. A threaded rod is rotatably connected to the inner cavity of the threaded hole, and the right end of the threaded rod passes through the inner cavity of the first sealed bearing and is fixedly connected to the power output end of the servo motor. The left end of the threaded rod is rotatably connected to the left side of the inner cavity of the pressurized water tank. A first annular groove is opened on the outer wall of the cylindrical movable seat, and a first annular groove is rotatably connected to the inner cavity of the first annular groove. A matching annular limiting plate is provided, with a sleeve fixedly fitted to the outer wall of the annular limiting plate. An annular scraper is fitted on the outer side of the sleeve, and four connecting rods arranged in a cross shape are fixedly connected to the inner wall of the annular scraper. The other end of each connecting rod is fixedly connected to the outer wall of the sleeve. A through hole is provided near the edge of the cylindrical moving seat, and a spray pipe is movably inserted through the inner cavity of the through hole. An inlet pipe is fixedly inserted through the top left side of the pressurized water storage tank, and the left end of the spray pipe is inserted into the inner cavity of the inlet pipe and fixedly connected to a limiting ring. The limiting ring is rotatably connected to the inner wall of the inlet pipe. Several spray holes are equidistantly provided on the spray pipe.

[0009] Preferably, a driven gear is sleeved and fixed on the outer wall of the spray pipe near the right end, and a transmission gear that meshes with the driven gear is sleeved and fixed on the outer wall of the threaded rod.

[0010] Preferably, the outer wall of the annular scraper is provided with a second annular groove, and the inner cavity of the second annular groove is provided with a matching annular rack plate. A connecting shell is fixedly connected to the top right side of the pressure storage tank, and a hydraulic push rod is provided on the top of the connecting shell. An L-shaped plate is fixedly connected to the power end of the hydraulic push rod. A second sealing bearing is provided on the L-shaped plate, and a sealing box is provided on the right side wall of the L-shaped plate. A drive motor is provided in the inner cavity of the sealing box. A transmission rod is rotatably connected to the inner cavity of the second sealing bearing. The right end of the moving rod is fixedly connected to the power output end of the drive motor. The left end of the transmission rod is fixedly connected to a drive gear adapted to the annular rack plate. A limit hole is opened on the L-shaped plate, and the inner cavity of the limit hole movably passes through the limit rod. The top end of the limit rod is fixedly connected to the top of the inner cavity of the connecting shell. Two strip scrapers are fixedly connected to both the left and right sides of the cylindrical moving seat. The two strip scrapers are symmetrically arranged about the central axis of the cylindrical moving seat. Each strip scraper is fitted against the side wall of the annular scraper.

[0011] Preferably, the outer wall of the threaded rod is fixedly connected to two arc-shaped scrapers distributed vertically, and the arc-shaped scrapers are fitted against the inner cavity side wall of the pressure storage tank.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. The dual-mode variable frequency heat pump unit in this invention adopts a variable flow and variable temperature difference heating mode. During heating, the outlet water is always maintained at the set outlet water temperature. The dual-mode variable frequency heat pump unit controls the start and stop according to the temperature of the pressurized water storage tank. When the temperature of the pressurized water storage tank is lower than the set temperature, the dual-mode variable frequency heat pump unit starts heating. At this time, the three-way valve AB-A opens, and direct heating water is supplied to avoid mixing. When the terminal water consumption is less than the unit's outlet water consumption, the unit can directly supply hot water. When the terminal water consumption is greater than the unit's outlet water consumption, the unit and the pressurized water storage tank jointly supply water to the outside. At this time, the unit's outlet water can be directly supplied to the outside, avoiding the problem of unstable water supply in traditional heat pump systems. At the same time, during defrosting, the electric three-way valve AB-B is switched to avoid the unit affecting the water temperature of the entire system.

[0013] 2. The present invention uses an elastic protective structure formed by horizontal and vertical baffles to block flying fragments when a pressurized water tank explodes, thereby reducing the probability of injury from flying fragments. In addition, it can also effectively solve the restrictions on the layout of the plant area when installing pressurized water tanks.

[0014] 3. This invention uses a servo motor to drive the threaded rod to rotate, which in turn drives the cylindrical moving seat to move horizontally back and forth and the arc-shaped scraper to rotate. The horizontal back and forth movement of the cylindrical moving seat can drive the annular scraper to move horizontally back and forth in the pressurized water tank, thereby scraping and cleaning the scale deposited on the inner wall of the pressurized water tank. The rotation of the arc-shaped scraper can also clean the scale deposited on the inner wall of the end side of the pressurized water tank. This not only maintains the integrity of the water tank structure, but also avoids the accumulation of scale causing local overheating or uneven stress in the water tank, which could lead to tank deformation or weld cracking and thus an explosion. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a pressurized direct-heating hot water system according to the present invention; Figure 2 This is a schematic diagram of a three-dimensional structure of a longitudinal baffle in a pressurized direct-heating hot water system according to the present invention; Figure 3 This is a three-dimensional structural diagram of a pressurized water storage tank in a pressurized direct-heating hot water system according to the present invention; Figure 4 This is a cross-sectional view of a pressurized water storage tank in a pressurized direct-heating hot water system according to the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view of point B in the middle; Figure 7 for Figure 4A magnified view of point C in the middle.

[0016] The diagram shows the following components: 1. Dual-mode variable frequency heat pump unit; 2. Pressurized water storage tank; 3. Electric three-way valve; 4. Unit circulation pump; 5. Return water pump; 6. Base; 7. Support seat; 8. Transmission gear; 9. Horizontal baffle; 10. First T-shaped square rod; 11. First square bar; 12. Second spring; 13. First fixing hole; 14. First L-shaped rod; 15. First spring; 16. Longitudinal baffle; 17. Second square bar; 18. Second fixing hole; 19. Second L-shaped rod; 20. Third spring; 21. Vertical plate; 22. Second T-shaped square rod; 23. Fourth spring; 24. First roller; 25. Second... 26. Roller; 27. Connecting seat; 28. Servo motor; 29. ​​Columnar moving seat; 30. Threaded rod; 31. Arc-shaped scraper; 32. First annular groove; 33. Annular limiting plate; 34. Sleeve; 35. Connecting rod; 36. Annular scraper; 37. Second annular groove; 38. Annular rack plate; 39. Connecting shell; 40. Hydraulic push rod; 41. L-shaped plate; 42. Sealing box; 43. Drive motor; 44. Transmission rod; 45. Drive gear; 46. Limiting rod; 47. Strip scraper; 48. Spray pipe; 49. Spray hole; 50. Inlet pipe; 51. Limiting ring; 52. Driven gear. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a technical solution; please refer to [link / reference]. Figure 1 : A pressurized direct-heating hot water system includes a dual-mode variable frequency heat pump unit 1, a pressurized water storage tank 2, an electric three-way valve 3, a unit circulation pump 4, and a return water pump 5. Two pressurized water storage tanks 2 are provided, arranged side-by-side, and connected by a pipeline. The electric three-way valve 3 is installed in the pipeline between the dual-mode variable frequency heat pump unit 1 and the two pressurized water storage tanks 2. The two outlet ports of the electric three-way valve 3 are AB-A and AB-B, respectively. When the dual-mode variable frequency heat pump unit 1 is connected to the left pressurized water storage tank 2, AB-A is opened; conversely, when the dual-mode system is connected to the left pressurized water storage tank 2, AB-B is opened. When the variable frequency heat pump unit 1 is connected to the right-side pressurized water storage tank 2, AB-A can be closed first and then AB-B can be opened. The unit circulation pump 4 is installed in the pipeline between the dual-mode variable frequency heat pump unit 1 and the right-side pressurized water storage tank 2. The pressurized water storage tank 2 on the right side is equipped with a cold water supply pipeline, and a hot water return pipeline is installed on the cold water supply pipeline. The return pump 5 is installed on the hot water return pipeline. The pressurized water storage tank 2 on the left side is equipped with a hot water supply pipeline. The bottom of both pressurized water storage tanks 2 is equipped with two symmetrical support seats 7, and the bottom of the two support seats 7 is fixedly connected to the same base 6.

[0019] Working Principle: The dual-mode variable frequency heat pump unit 1 adopts a variable flow and variable temperature difference heating mode. During heating, the outlet water is always maintained at the set outlet water temperature. The dual-mode variable frequency heat pump unit 1 controls the start and stop according to the temperature of the water in the pressurized water storage tank 2. When the temperature of the water in the pressurized water storage tank 2 is lower than the set temperature, the dual-mode variable frequency heat pump unit 1 starts heating. At this time, the AB-A valve of the electric three-way valve 3 is opened, and direct hot water is supplied to avoid mixing. When the terminal water consumption is less than the unit's water output, the unit can directly supply hot water. When the terminal water consumption is greater than the unit's water output, the unit and the pressurized water storage tank 2 jointly supply water to the outside. At this time, the unit's outlet water can be directly supplied to the outside, avoiding the problem of unstable water supply in traditional heat pump systems. At the same time, during defrosting, the AB-B valve of the electric three-way valve 3 is switched to avoid the unit affecting the water temperature of the entire system.

[0020] This invention also provides another technical solution, please refer to [link / reference]. Figure 2-7 : Both pressure water storage tanks 2 are equipped with protective mechanisms on their outer sides to block debris in the event of an explosion. Both pressure water storage tanks 2 are also equipped with descaling mechanisms inside their cavities to clean the scale deposited on the inner walls of the pressure water storage tanks 2.

[0021] The protective mechanism includes two transverse baffles 9 and a longitudinal baffle 16. The two transverse baffles 9 are located on the left and right sides of the pressurized water storage tank 2, respectively. Each transverse baffle 9 has a first square slot. The inner cavity of each of the two first square slots is slidably penetrated by a first square bar 11, and the first square bar 11 has a first fixing hole 13. A first horizontal plate is fixedly connected to the opposite side of each of the two transverse baffles 9, and a first L-shaped rod 14 is slidably penetrated through the first horizontal plate. The longest ends of the two first L-shaped rods 14 respectively penetrate the inner cavity of the adjacent first fixing hole 13. A first spring 15 is sleeved on the outer wall of each of the two first L-shaped rods 14, and the two ends of the first spring 15 are respectively connected to the first fixing hole 13. An L-shaped rod 14 is fixedly connected to a first horizontal plate. Two support seats 7 each have a horizontally opening first square hole, through which a matching first T-shaped rod 10 slides. The longest ends of the two first T-shaped rods 10 are fixedly connected to adjacent first square bars 11. A second spring 12 is fitted onto the outer wall of each of the two first T-shaped rods 10, with both ends of the second spring 12 fixedly connected to the first T-shaped rod 10 and the support seat 7, respectively. Two longitudinal baffles 16 are located on the front and rear sides of the pressurized water tank 2, and each of the two longitudinal baffles 16 has a second square slot. A matching second square bar slides through the inner cavity of each of the two second square slots. 17. A second fixing hole 18 is provided on the second square bar 17. A second horizontal plate is fixedly connected to the opposite side of the two longitudinal baffles 16. A second L-shaped rod 19 slides through the second horizontal plate. The longest ends of the two second L-shaped rods 19 respectively pass through the inner cavity of the adjacent second fixing hole 18. A third spring 20 is sleeved on the outer wall of the two second L-shaped rods 19. The two ends of the third spring 20 are fixedly connected to the second L-shaped rod 19 and the second horizontal plate respectively. Vertical plates 21 are provided on the front and rear sides of the two support seats 7. The vertical plates 21 are fixedly connected to the base 6. A second square hole is provided on each vertical plate 21. A matching second T-shaped square rod slides through the inner cavity of the second square hole. 22. The longest end of each second T-shaped square rod 22 is fixedly connected to the adjacent second square bar 17. The outer wall of each second T-shaped square rod 22 is fitted with a fourth spring 23, and the two ends of the fourth spring 23 are fixedly connected to the second T-shaped square rod 22 and the vertical plate 21, respectively. Through the arrangement of the first T-shaped square rod 10, the first square bar 11, the second spring 12, the second T-shaped square rod 22, the fourth spring 23 and the second square bar 17, when the pressure tank 2 explodes, the impact force of the fragments impacting the transverse baffle 9 and the longitudinal baffle 16 can be weakened by the elastic force of the second spring 12 and the fourth spring 23, thereby effectively preventing the fragments from flying and injuring people.

[0022] The bottom of the first square bar 11 and the second square bar 17 are respectively rotatably connected to the first roller 24 and the second roller 25, and the first roller 24 and the second roller 25 are both fitted to the top of the base 6. By setting the first roller 24 and the second roller 25, the frictional resistance when the transverse baffle 9 and the longitudinal baffle 16 move horizontally can be reduced, making the horizontal baffle 9 and the longitudinal baffle 16 move more smoothly, which is conducive to improving the weakening effect of the impact force of the fragments.

[0023] The descaling mechanism includes a connecting seat 26, which is fixedly connected to the right side of the pressurized water tank 2. A servo motor 27 is mounted on the connecting seat 26, and a first sealed bearing is provided on the connecting seat 26. The inner cavity of the pressurized water tank 2 is provided with a cylindrical moving seat 28, and a threaded hole is opened at the center of the cylindrical moving seat 28. A threaded rod 29 is rotatably connected to the inner cavity of the threaded hole, and the right end of the threaded rod 29 passes through the inner cavity of the first sealed bearing and is fixedly connected to the power output end of the servo motor 27. The left end of the threaded rod 29 is rotatably connected to the left side of the inner cavity of the pressurized water tank 2. A first annular groove 31 is opened on the outer wall of the cylindrical moving seat 28, and an annular limiting plate 32 that matches it is rotatably connected to the inner cavity of the first annular groove 31. A sleeve 33 is fixedly fitted on the outer wall of the annular limiting plate 32, and an annular scraper 35 is fitted on the outer side of the sleeve 33. Four connecting rods 34 distributed in a cross shape are fixedly connected to the inner wall of the annular scraper 35. The other end of the connecting rod 34 is fixedly connected to the outer wall of the sleeve 33. A through hole is provided near the edge of the cylindrical movable seat 28, and the spray pipe 47 is movably inserted through the inner cavity of the through hole. An inlet pipe 49 is fixedly inserted through the top left side of the pressurized water storage tank 2, and the left end of the spray pipe 47 is inserted into the inner cavity of the inlet pipe 49 and fixedly connected to a limit ring 50. The limit ring 50 is rotatably connected to the inner wall of the inlet pipe 49. Several spray holes 4 are equidistantly provided on the spray pipe 47. 8. The servo motor 27 drives the threaded rod 29 to rotate, which in turn drives the cylindrical moving seat 28 to move horizontally back and forth under the limit of the spray pipe 47. This, in turn, drives the annular scraper 35 to move horizontally back and forth in the inner cavity of the pressurized water tank 2, and scrapes off the scale deposited on the inner wall of the pressurized water tank 2. Through the setting of the inlet pipe 49, the spray pipe 47 and the spray hole 48, an acidic descaling solution can be sprayed onto the inner wall of the pressurized water tank 2, thereby further improving the descaling effect.

[0024] A driven gear 51 is sleeved and fixed on the outer wall of the spray pipe 47 near the right end, and a transmission gear 8 that meshes with the driven gear 51 is sleeved and fixed on the outer wall of the threaded rod 29. The meshing of the transmission gear 8 with the driven gear 51 can drive the spray pipe 47 to rotate synchronously, thereby increasing the spraying range of the acidic descaling solution and improving the thoroughness of cleaning the scale on the inner wall of the pressurized water storage tank 2.

[0025] The outer wall of the annular scraper 35 is provided with a second annular groove 36, and the inner cavity of the second annular groove 36 is provided with a matching annular rack plate 37. A connecting shell 38 is fixedly connected to the top right side of the pressure storage tank 2, and a hydraulic push rod 39 is provided on the top of the connecting shell 38. An L-shaped plate 40 is fixedly connected to the power end of the hydraulic push rod 39. A second sealing bearing is provided on the L-shaped plate 40, and a sealing box 41 is provided on the right side wall of the L-shaped plate 40. The inner cavity of the sealing box 41 is provided with... A drive motor 42 is installed, and a transmission rod 43 is rotatably connected to the inner cavity of the second sealed bearing. The right end of the transmission rod 43 is fixedly connected to the power output end of the drive motor 42, and the left end of the transmission rod 43 is fixedly connected to a drive gear 44 adapted to the annular rack plate 37. A limit hole is opened on the L-shaped plate 40, and a limit rod 45 is movably passed through the inner cavity of the limit hole. The top end of the limit rod 45 is fixedly connected to the top of the inner cavity of the connecting shell 38. The L-shaped plate 40 can be fixed by the limit rod 45. The plate 40 is vertically limited to improve the stability of the L-shaped plate 40's lifting and moving. Two strip scrapers 46 are fixedly connected to both sides of the columnar moving seat 28, and the two strip scrapers 46 are symmetrically arranged about the central axis of the columnar moving seat 28. Each strip scraper 46 is attached to the side wall of the annular scraper 35. After descaling is completed, the annular scraper 35 can be moved horizontally to the position below the connecting shell 38 under the operation of the servo motor 27. Then, the hydraulic push rod 39 is started to push the L-shaped plate 40 vertically downward and drive the drive gear 44 to mesh with the annular rack plate 37. Thus, when the drive motor 42 is started to drive the transmission rod 43 to rotate, the annular rack plate 37 can be driven to rotate and the annular scraper 35 can be driven to rotate. When the annular scraper 35 rotates, it can scrape against the strip scrapers 46, thereby scraping and cleaning the scale stains adhering to the side walls of the annular scraper 35, thus effectively ensuring the subsequent scale cleaning effect.

[0026] Two arc-shaped scrapers 30 are fixedly connected to the outer wall of the threaded rod 29, and the arc-shaped scrapers 30 are fitted to the inner cavity side wall of the pressure water tank 2. The threaded rod 29 can drive the arc-shaped scrapers 30 to rotate, thereby cleaning the scale deposited on the inner wall of the pressure water tank 2.

[0027] Working Principle: In use, this invention delivers an acidic descaling solution to the spray pipe 47 via the inlet pipe 49. With several spray holes 48, the acidic descaling solution is sprayed onto the inner wall of the pressurized water tank 2, thereby dissolving and softening the scale through an acid-base neutralization reaction. Then, the servo motor 27 is activated, driving the threaded rod 29 to rotate and causing the cylindrical moving seat 28 to move horizontally back and forth. This, in turn, causes the annular scraper 35 to move horizontally back and forth, scraping off the scale on the inner wall of the pressurized water tank 2. Furthermore, the rotation of the arc-shaped scraper 30 driven by the threaded rod 29 can also scrape off the scale on the inner wall of the end side of the pressurized water tank 2. After descaling is completed, the servo motor 27 can be used to drive the annular scraper 35 to reset. Then, the hydraulic push rod 39 is started to push the L-shaped plate 40 to move vertically downward, and drive the drive gear 44 to mesh with the annular rack plate 37. When the drive motor 42 is started to drive the transmission rod 43 to rotate, the drive gear 44 can be used to drive the annular rack plate 37 to rotate. The rotation of the annular rack plate 37 drives the annular scraper 35 to rotate. Thus, with the symmetrical strip scrapers 46 on both sides, the scale and dirt on both sides of the annular scraper 35 are automatically self-cleaned, thereby ensuring the cleaning effect of the annular scraper 35 on the inner wall of the pressurized water storage tank 2.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressurized direct hot water system, comprising a dual-mode variable frequency heat pump unit (1), a pressurized water storage tank (2), an electric three-way valve (3), a unit circulating pump (4) and a return water pump (5), characterized in that: The pressure water storage tank (2) is provided with two, and the two pressure water storage tanks (2) are provided with a communication pipeline, the electric three-way valve (3) is arranged in the pipeline between the double-mode variable frequency heat pump unit (1) and the two pressure water storage tanks (2), the unit circulating pump (4) is arranged in the pipeline between the double-mode variable frequency heat pump unit (1) and the right pressure water storage tank (2), the cold water replenishment pipeline is arranged on the right pressure water storage tank (2), and the hot water return pipeline is arranged on the cold water replenishment pipeline, the return pump (5) is arranged on the hot water return pipeline, the hot water supply pipeline is arranged on the left pressure water storage tank (2), the bottoms of the two pressure water storage tanks (2) are provided with two left-right symmetrical supporting seats (7), the bottoms of the two supporting seats (7) are fixedly connected with the same base (6), the outer sides of the two pressure water storage tanks (2) are provided with protection mechanisms, the protection mechanisms are used for blocking the fragments when the pressure water storage tank (2) explodes, and the inner cavities of the two pressure water storage tanks (2) are provided with descaling mechanisms, and the descaling mechanisms are used for cleaning the scale deposited on the inner wall of the pressure water storage tank (2).

2. A pressurised direct hot water system as claimed in claim 1, characterised in that: The protection mechanism includes two lateral baffles (9) and longitudinal baffles (16), the two lateral baffles (9) are located on the left and right sides of the pressure-bearing water storage tank (2) respectively, first square grooves are formed in the two lateral baffles (9), first square grooves are slidably penetrated by first square bars (11) matched with the first square grooves, first fixing holes (13) are formed in the first square bars (11), first L-shaped rods (14) are slidably penetrated through the first lateral plates, the longest ends of the two first L-shaped rods (14) are respectively penetrated through the inner cavities of the adjacent first fixing holes (13), the outer walls of the two first L-shaped rods (14) are sleeved with first springs (15), the two ends of the first springs (15) are fixedly connected with the first L-shaped rods (14) and the first lateral plates, first square holes are horizontally formed in the two support bases (7), the inner cavities of the first square holes are slidably penetrated by first T-shaped square rods (10) matched with the first square holes, the longest ends of the two first T-shaped square rods (10) are fixedly connected with the adjacent first square bars (11), the outer walls of the two first T-shaped square rods (10) are sleeved with second springs (12), the two ends of the second springs (12) are fixedly connected with the first T-shaped square rods (10) and the support bases (7), two longitudinal baffles (16) are located on the front and back sides of the pressure-bearing water storage tank (2), second square grooves are formed in the two longitudinal baffles (16), the inner cavities of the second square grooves are slidably penetrated by second square bars (17) matched with the second square grooves, second fixing holes (18) are formed in the second square bars (17), second lateral plates are fixedly connected with the two longitudinal baffles (16) on the opposite sides, second L-shaped rods (19) are slidably penetrated through the second lateral plates, the longest ends of the two second L-shaped rods (19) are respectively penetrated through the inner cavities of the adjacent second fixing holes (18), the outer walls of the two second L-shaped rods (19) are sleeved with third springs (20), the two ends of the third springs (20) are fixedly connected with the second L-shaped rods (19) and the second lateral plates, vertical plates (21) are arranged on the front and back sides of the two support bases (7), the vertical plates (21) are fixedly connected with the base (6), second square holes are formed in the vertical plates (21), the inner cavities of the second square holes are slidably penetrated by second T-shaped square rods (22) matched with the second square holes, the longest ends of the two second T-shaped square rods (22) are fixedly connected with the adjacent second square bars (17), the outer walls of the two second T-shaped square rods (22) are sleeved with fourth springs (23), the two ends of the fourth springs (23) are fixedly connected with the second T-shaped square rods (22) and the vertical plates (21).

3. A pressurised direct hot water system as claimed in claim 2, wherein: The bottom of the first side bar (11) and the second side bar (17) is rotatably connected with a first roller (24) and a second roller (25), and the first roller (24) and the second roller (25) are arranged on the top of the base (6).

4. A pressurised direct hot water system according to claim 1, wherein: The descaling mechanism comprises a connecting seat (26), the connecting seat (26) is fixedly connected to the right side of the pressure-bearing water storage tank (2), a servo motor (27) is installed on the connecting seat (26), and a first sealing bearing is arranged on the connecting seat (26); the inner cavity of the pressure-bearing water storage tank (2) is provided with a cylindrical moving seat (28), a threaded hole is formed at the center of the cylindrical moving seat (28), a threaded rod (29) is rotatably connected to the inner cavity of the threaded hole, the right end of the threaded rod (29) penetrates through the inner cavity of the first sealing bearing and is fixedly connected to the power output end of the servo motor (27), and the left end of the threaded rod (29) is rotatably connected to the left side of the inner cavity of the pressure-bearing water storage tank (2); a first annular groove (31) is formed in the outer wall of the cylindrical moving seat (28), and an annular limiting plate (32) matched with the first annular groove (31) is rotatably connected to the inner cavity of the first annular groove (31); a sleeve (33) is fixedly connected to the outer wall of the annular limiting plate (32), an annular scraper (35) is arranged on the outer side of the sleeve (33), four connecting rods (34) distributed in a cross shape are fixedly connected to the inner wall of the annular scraper (35), one end of each connecting rod (34) is fixedly connected to the outer wall of the sleeve (33), and a perforation is formed in the cylindrical moving seat (28) near the edge; a liquid injection pipe (47) is movably arranged in the inner cavity of the perforation, a liquid inlet pipe (49) is fixedly arranged on the left side of the top of the pressure-bearing water storage tank (2), the left end of the liquid injection pipe (47) is inserted into the inner cavity of the liquid inlet pipe (49) and is fixedly connected to a limiting ring (50), and the limiting ring (50) is rotatably connected to the inner wall of the liquid inlet pipe (49); and a plurality of liquid injection holes (48) are equidistantly formed in the liquid injection pipe (47).

5. A pressurised direct hot water system as claimed in claim 4, wherein: A driven gear (51) is fixedly arranged on the outer wall of the right end of the liquid injection pipe (47), and a transmission gear (8) engaged with the driven gear (51) is fixedly arranged on the outer wall of the threaded rod (29).

6. A pressurised direct hot water system as claimed in claim 4, wherein: The outer wall of the annular scraper (35) is provided with a second annular groove (36), and the inner cavity of the second annular groove (36) is provided with a ring-shaped rack plate (37) matched therewith; the right top of the pressure-bearing water storage tank (2) is fixedly connected with a connecting shell (38), and the top of the connecting shell (38) is provided with a hydraulic push rod (39); the power end of the hydraulic push rod (39) is fixedly connected with an L-shaped plate (40), and the L-shaped plate (40) is provided with a second sealing bearing; the right side wall of the L-shaped plate (40) is provided with a sealing box (41), and the inner cavity of the sealing box (41) is provided with a driving motor (42); the inner cavity of the second sealing bearing is rotatably connected with a transmission rod (43), and the right end of the transmission rod (43) is fixedly connected with the power output end of the driving motor (42); the left end of the transmission rod (43) is fixedly connected with a driving gear (44) matched with the ring-shaped rack plate (37); the L-shaped plate (40) is provided with a limiting hole, and the inner cavity of the limiting hole is movably penetrated by a limiting rod (45); the top end of the limiting rod (45) is fixedly connected with the inner cavity top of the connecting shell (38); the left and right sides of the cylindrical moving seat (28) are both fixedly connected with two strip-shaped scrapers (46), and the two strip-shaped scrapers (46) are symmetrically arranged in front and back with the central axis of the cylindrical moving seat (28) as the axis of symmetry; each strip-shaped scraper (46) is arranged in close contact with the side wall of the annular scraper (35).

7. A pressurised direct hot water system as claimed in claim 6, characterised in that: The outer wall of the threaded rod (29) is fixedly connected with two arc-shaped scrapers (30) distributed above and below, and the arc-shaped scrapers (30) are arranged in close contact with the end side wall of the inner cavity of the pressure-bearing water storage tank (2).

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