Hot water circulating pump with coupler

Abstract

The invention discloses a hot water circulating pump with couplings, and relates to the field of centrifugal pumps, the hot water circulating pump comprises a base, the top surface of the base is fixedly connected with a base plate, a protective cover, a first support and a pump body, and the end face of the pump body is provided with a machine seal gland. Therefore, maintenance cost is reduced, potential safety hazards are reduced, the coaxiality calibration process is simplified, repeated measurement and adjustment of the position of the motor are not needed, time and labor are saved, coaxiality can be guaranteed, overload protection can be achieved, overload burning of the motor can be avoided, safety accidents are reduced, the operation safety of the whole hot water circulation system is improved, and the service life of the hot water circulation system is prolonged. And overload protection can be adaptively changed according to the size of the motor, so that coaxiality calibration and overload protection adjustment are synchronously carried out, secondary measurement and adjustment are not needed, and the automation degree of the device is improved while time and labor are saved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pumps, specifically a hot water circulating pump with a coupling. Background Technology

[0002] The closest existing technical solution is based on "split power transmission and multi-stage pressurization", which strengthens the basic seal for hot water medium characteristics and is mainly composed of four parts: power module, transmission module, pump body module and auxiliary module.

[0003] The aforementioned power module uses a Y-series high-temperature resistant asynchronous motor (suitable for environments below 150℃). The motor output shaft is connected to the coupling via a flat key. The motor base and pump base are fixed to the same concrete foundation with expansion bolts. The coaxiality of the motor shaft and pump shaft is calibrated by adjusting shims. If the motor shaft and pump shaft are not coaxial, the coupling will bear additional radial force, which will aggravate wear and vibration, increase equipment maintenance costs, and make it easier to create safety hazards. The coaxiality calibration process is complicated and requires repeated measurement and adjustment of the motor position, which is time-consuming and labor-intensive, and cannot guarantee coaxiality.

[0004] When the pump body experiences overload conditions such as impeller jamming or pipeline blockage, the torque will be directly transmitted to the motor, which can easily cause the motor to burn out or even lead to electrical failures. Under the same load and design level, a small motor works under full load, while a large motor works under light load. Large motors have a greater safety margin and are less likely to burn out. Therefore, during the coaxiality calibration, the smaller the motor, the lower the burn-out load. Overload protection needs to be adjusted according to the size of different motors to protect core components such as the motor and drive shaft from damage, avoid safety accidents caused by overload, and improve the operational safety of the entire hot water circulation system.

[0005] A search revealed that Chinese patent application CN104879315B discloses a hot water circulation pump shaft cooled by a heat pipe. Although the pump shaft is cooled without affecting the pump body structure, the aforementioned problems still exist. Furthermore, it is impossible to adjust the overload protection while simultaneously calibrating the coaxiality, requiring secondary measurement and adjustment, which is time-consuming and labor-intensive, and reduces the degree of automation of the device. Summary of the Invention

[0006] The purpose of this invention is to provide a hot water circulation pump with a coupling to solve the problems mentioned in the background art.

[0007] This invention provides the following technical solution: a hot water circulating pump with a coupling, comprising a base, a base plate, a protective cover, a first bracket, and a pump body fixedly connected to the top surface of the base, an organic seal cover installed on the end face of the pump body, one end of a suspension fixedly connected to the end face of the organic seal cover, the other end of the suspension fixedly connected to the first bracket, a pump shaft sleeved on the central axis of the organic seal cover and the suspension, an impeller fixedly connected to one end of the pump shaft, a retaining strip fixedly connected to the other end of the pump shaft, and a nested part sleeved on the end of the pump shaft, the inner surface of the nested part having a retaining groove, and the nested part having a retaining groove. The end face of the device is provided with a fitting convex surface. The nested outer sleeve is provided with a pump coupling. One end of the pump coupling is fixedly connected to an outer half ring. The other end of the pump coupling is provided with a groove. The end face of the groove is provided with a fitting concave surface. The outer edge of the pump coupling is fixedly connected to a pin. The end of the pin is fitted with a motor coupling. An elastic ring is provided between the pin and the motor coupling. A retaining ring is provided between the motor coupling and the pump coupling. One end of a drive shaft is fixedly connected to the central axis of the motor coupling. The other end of the drive shaft is equipped with a motor.

[0008] As a further embodiment of the present invention: the protective cover surrounds the motor coupling and the pump coupling, the impeller on the pump shaft is located in the pump body, and multiple retaining strips are provided, which are evenly distributed about the central axis of the pump shaft, and the retaining strips are engaged with the retaining grooves.

[0009] As a further aspect of the present invention: the fitting convex surface and the fitting concave surface are fitted together, the fitting convex surface and the fitting concave surface can convert torque into axial thrust, the nesting is sleeved with the groove, the elastic ring and the retaining ring are both sleeved with the pin, and the axis of the outer half ring coincides with the axis of the pump shaft.

[0010] As a further embodiment of the present invention: an inner half-ring is fixedly connected to the end face of the motor coupling, and rollers are hinged to both ends of the outer half-ring. An inner cavity and a flow channel are opened in the substrate, and a rotating shaft is rotatably connected to the side wall of the substrate. A main bevel gear is fixedly connected to the end of the rotating shaft, and a secondary bevel gear is meshed with the outer surface of the main bevel gear. A lead screw is fixedly connected to the central axis of the secondary bevel gear, and a push rod is threadedly connected to the outer surface of the lead screw. A lifting platform is fixedly connected to the top surface of the push rod.

[0011] As a further embodiment of the present invention: the axis of the inner half ring coincides with the axis of the outer half ring, the axis of the inner half ring coincides with the axis of the transmission shaft, and the inner half ring and the outer half ring are in close contact, and the main bevel gear and the secondary bevel gear are both located in the inner cavity.

[0012] As a further embodiment of the present invention: the rotating shaft is sleeved with the base plate, the lead screw and the top rod have self-locking properties, the top surface of the lifting platform is slidably connected to the bottom surface of the motor, and the lead screw is rotatably connected to the base plate.

[0013] As a further embodiment of the present invention: one end of a piston rod is fixedly connected to the bottom surface of the lifting platform, and a sleeve is sleeved on the other end of the piston rod. The sleeve is fixedly connected to the base plate. One end of the flow channel is connected to the sleeve, and the other end of the flow channel is connected to one end of a conduit. The other end of the conduit is connected to a through-core top, and a second bracket is fixedly connected to the outer surface of the through-core top.

[0014] As a further embodiment of the present invention: the second bracket is fixedly connected to the inner top surface of the protective cover, the through-core top is sleeved with the pump shaft, and the output end of the through-core top is rotatably connected to the nested end face through a bearing. Four piston rods and four sleeves are provided, and the four piston rods and four sleeves are located at the four corners of the base plate. The total amount of gas in the sleeves, flow channels, conduits and through-core top is constant.

[0015] Compared with the prior art, the beneficial effects of the present invention, using the above technical solution, are as follows: This invention utilizes a main bevel gear on a rotating shaft to drive a secondary bevel gear, which in turn causes a lead screw on the secondary bevel gear to move a push rod. The lifting platform on the push rod is limited by a piston rod and cannot rotate on its own, causing the push rod to rise under the influence of the lead screw. This, in turn, raises the motor via the lifting platform, indirectly bringing the inner half-ring of the motor coupling closer to the outer half-ring until they are tightly pressed together. If there is a horizontal gap between the inner and outer half-rings during this process, the convex surface of the inner half-ring will press against the end of the outer half-ring. Since the spatial position of the outer half-ring remains constant, the inner half-ring, guided by rollers, moves and rises until it is tightly pressed against the outer half-ring and concentric. At this point, the axis of the drive shaft and the axis of the pump shaft are automatically collinear, achieving rapid coaxiality calibration. This avoids additional radial forces on the pump coupling and motor coupling, reducing wear and vibration, thus reducing maintenance costs and safety hazards. It also simplifies the coaxiality calibration process, eliminating the need for repeated measurements and adjustments to the motor position, saving time and effort while ensuring coaxiality.

[0016] In this invention, the retaining strip on the pump shaft engages with the retaining groove on the nest, allowing the nest to rotate synchronously with the pump shaft. If the pump shaft cannot rotate, the nest also cannot rotate. Meanwhile, the motor continues to run and continuously increases its torque, causing the motor coupling on the transmission shaft to continuously increase its tendency to drive the pump coupling to rotate. The fitting concave surface on the pump coupling and the fitting convex surface on the nest engage and connect, and the fitting convex and concave surfaces can convert torque into axial thrust. This causes the fitting convex surface to drive the nest to translate towards the pump shaft. During this process, the nest synchronously presses against the output end of the through-core until the axial thrust of the nest exceeds the thrust of the output end of the through-core. At this point, the fitting convex and concave surfaces separate, and the transmission shaft can rotate again. This prevents the motor torque from continuously increasing, achieving the purpose of overload protection. This avoids motor overload burnout, reduces safety accidents, and improves the operational safety of the entire hot water circulation system.

[0017] As the lifting platform rises, the piston rod on the platform also rises, thereby reducing the air pressure at the bottom of the sleeve. This allows the sleeve to draw gas from the core through the flow channel and conduit, thus reducing the thrust at the output end of the core. The greater the height of the lifting platform, the lower the thrust at the output end of the core, and the lower the thrust required for the axial movement of the nest. Therefore, the torque converted between the mating convex and concave surfaces is lower, achieving the purpose of adjusting overload protection. Furthermore, the overload protection can adapt to changes in the size of the motor, allowing coaxiality calibration and overload protection adjustment to be performed simultaneously without secondary measurement and adjustment. This saves time and effort while improving the automation level of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the hot water circulating pump with coupling of the present invention; Figure 2 This is a half-sectional schematic diagram of the protective cover structure of the present invention; Figure 3 This is a half-sectional schematic diagram of the pump coupling structure of the present invention; Figure 4 This is a schematic diagram of the interlocking concave surface structure of the present invention; Figure 5 for Figure 4 Enlarged view of the structure of section A in the middle; Figure 6 This is a schematic diagram of the interlocking convex surface structure of the present invention; Figure 7 This is a half-sectional schematic diagram of the top rod structure of the present invention; Figure 8 for Figure 7 Enlarged view of the structure of section B; Figure 9 for Figure 7 Enlarged view of the structure of section C.

[0019] In the diagram: 1. Base; 2. Base plate; 3. Protective cover; 4. First bracket; 5. Pump body; 6. Mechanical seal cover; 7. Suspension; 8. Pump shaft; 9. Clamping strip; 10. Nesting; 11. Clamping groove; 12. Fitting convex surface; 13. Pump coupling; 14. Groove; 15. Fitting concave surface; 16. Pin; 17. Motor coupling; 18. Elastic ring; 19. Retaining ring; 20. Drive shaft; 21. Motor; 22. Inner half ring; 23. Outer half ring; 24. Roller; 25. Inner cavity; 26. Rotating shaft; 27. Main bevel gear; 28. Secondary bevel gear; 29. ​​Lead screw; 30. Push rod; 31. Lifting platform; 32. Piston rod; 33. Sleeve; 34. Flow channel; 35. Guide tube; 36. Through-core top; 37. Second bracket. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example 1, please refer to Figures 1-4 and Figure 6 This invention provides a technical solution: a hot water circulating pump with a coupling, comprising a base 1, a base plate 2, a protective cover 3, a first bracket 4, and a pump body 5 fixedly connected to the top surface of the base 1, an organic seal cover 6 installed on the end face of the pump body 5, one end of a suspension 7 fixedly connected to the end face of the organic seal cover 6, and the other end of the suspension 7 fixedly connected to the first bracket 4, a pump shaft 8 sleeved on the central axis of the organic seal cover 6 and the suspension 7, an impeller fixedly connected to one end of the pump shaft 8, a retaining strip 9 fixedly connected to the other end of the pump shaft 8, and a nest 10 sleeved on the end of the pump shaft 8, the inner surface of the nest 10 having a retaining groove 11, and the end face of the nest 10 having an engaging protrusion. A pump coupling 13 is fitted over a nested 10 on surface 12. One end of the pump coupling 13 is fixedly connected to an outer half-ring 23. The other end of the pump coupling 13 has a groove 14 with a fitting concave surface 15 on its end face. A pin 16 is fixedly connected to the outer edge of the pump coupling 13. A motor coupling 17 is fitted onto the end of the pin 16. An elastic ring 18 is provided between the pin 16 and the motor coupling 17. A retaining ring 19 is provided between the motor coupling 17 and the pump coupling 13. One end of a drive shaft 20 is fixedly connected to the central axis of the motor coupling 17. A motor 21 is installed on the other end of the drive shaft 20.

[0022] Please see Figure 1 , Figure 3 and Figure 6 The protective cover 3 surrounds the motor coupling 17 and the pump coupling 13. The impeller on the pump shaft 8 is located inside the pump body 5. Multiple retaining strips 9 are provided, and the multiple retaining strips 9 are evenly distributed about the central axis of the pump shaft 8. The retaining strips 9 are engaged with the retaining grooves 11.

[0023] Please see Figure 3 , Figure 4 and Figure 6 The convex surface 12 and the concave surface 15 are fitted together and connected. The convex surface 12 and the concave surface 15 can convert torque into axial thrust. The nest 10 is sleeved with the groove 14. The elastic ring 18 and the retaining ring 19 are both sleeved with the pin 16. The axis of the outer half ring 23 coincides with the axis of the pump shaft 8.

[0024] Specifically, during the assembly of the motor 21, the motor 21 is connected to the lifting platform 31. At this time, the lifting platform 31 is at its lowest height and close to the base plate 2, so that the height of the transmission shaft 20 on the motor 21 is lower than the height of the pump shaft 8, and the height of the axis of the motor coupling 17 is lower than the height of the axis of the pump coupling 13. Consequently, the inner half ring 22 is located below the outer half ring 23. Then, the rotating shaft 26 on the base plate 2 is rotated, so that the main bevel gear 27 on the rotating shaft 26 drives the secondary bevel gear 28 to rotate, so that the lead screw 29 on the secondary bevel gear 28 drives the push rod 30 to move. The lifting platform 31 on the push rod 30 is limited by the piston rod 32 and cannot rotate on its own, so the push rod 30 rises under the drive of the lead screw 29, thereby lifting the motor 21, indirectly causing the motor coupling to... The inner half-ring 22 on device 17 approaches the outer half-ring 23 until the inner half-ring 22 and the outer half-ring 23 are in close contact. During this process, if there is a horizontal gap between the inner half-ring 22 and the outer half-ring 23, the convex surface of the inner half-ring 22 will press the end of the outer half-ring 23, while the spatial position of the outer half-ring 23 remains constant. This allows the inner half-ring 22 to move and rise under the guidance of the roller 24 until the inner half-ring 22 and the outer half-ring 23 are in close contact and concentric. At this time, the axis of the drive shaft 20 and the axis of the pump shaft 8 are automatically collinear, achieving the purpose of rapid coaxiality calibration. This avoids the pump coupling 13 and the motor coupling 17 bearing additional radial force, reduces wear and vibration, thereby reducing maintenance costs and safety hazards. At the same time, it simplifies the coaxiality calibration process, eliminating the need to repeatedly measure and adjust the position of the motor 21, saving time and effort while ensuring coaxiality.

[0025] Example 2, please refer to Figure 4 , Figure 5 , Figure 7 and Figure 8 The present invention provides a technical solution: a hot water circulating pump with a coupling, wherein an inner half ring 22 is fixedly connected to the end face of the motor coupling 17, and rollers 24 are hinged to both ends of the outer half ring 23. An inner cavity 25 and a flow channel 34 are opened in the base plate 2, and a rotating shaft 26 is rotatably connected to the side wall of the base plate 2. A main bevel gear 27 is fixedly connected to the end of the rotating shaft 26. A secondary bevel gear 28 is meshed with the outer surface of the main bevel gear 27. A lead screw 29 is fixedly connected to the central axis of the secondary bevel gear 28. A top rod 30 is threadedly connected to the outer surface of the lead screw 29. A lifting platform 31 is fixedly connected to the top surface of the top rod 30.

[0026] Please see Figure 4 , Figure 5 and Figure 8 The axis of the inner half ring 22 coincides with the axis of the outer half ring 23, and the axis of the inner half ring 22 coincides with the axis of the transmission shaft 20. The inner half ring 22 and the outer half ring 23 are in close contact. The main bevel gear 27 and the secondary bevel gear 28 are both located in the inner cavity 25.

[0027] Please see Figure 2and Figure 8 The rotating shaft 26 is sleeved with the base plate 2, the lead screw 29 and the top rod 30 have self-locking properties, the top surface of the lifting platform 31 is slidably connected with the bottom surface of the motor 21, and the lead screw 29 is rotatably connected with the base plate 2.

[0028] Specifically, when the pump body 5 experiences overload conditions such as impeller jamming or pipeline blockage, the pump shaft 8 cannot rotate. The retaining strip 9 on the pump shaft 8 engages with the retaining groove 11 on the nest 10, causing the nest 10 to rotate synchronously with the pump shaft 8. If the pump shaft 8 cannot rotate, the nest 10 also cannot rotate. Meanwhile, the motor 21 continues to operate and continuously increases its torque, causing the motor coupling 17 on the transmission shaft 20 to continuously increase the tendency to drive the pump coupling 13 to rotate. The mating concave surface 15 on the pump coupling 13 engages with the mating convex surface 12 on the nest 10, and the mating convex surface... The mating concave surface 12 and the mating convex surface 15 can convert torque into axial thrust, thereby causing the mating convex surface 12 to drive the nest 10 to translate towards the pump shaft 8. During this process, the nest 10 simultaneously squeezes the output end of the through-core top 36 until the axial thrust of the nest 10 is greater than the thrust of the output end of the through-core top 36. At this time, the mating convex surface 12 and the mating concave surface 15 separate, and the transmission shaft 20 can rotate again, preventing the torque of the motor 21 from continuously increasing, achieving the purpose of overload protection, thereby preventing the motor 21 from overload and burning out, reducing safety accidents, and improving the operational safety of the entire hot water circulation system.

[0029] Example 3, please refer to Figures 1-3 , Figure 6 , Figure 7 and Figure 9 The present invention provides a technical solution: a hot water circulation pump with a coupling, wherein one end of a piston rod 32 is fixedly connected to the bottom surface of the lifting platform 31, and a sleeve 33 is sleeved on the other end of the piston rod 32. The sleeve 33 is fixedly connected to the base plate 2. One end of the flow channel 34 is connected to the sleeve 33, and the other end of the flow channel 34 is connected to one end of a conduit 35. The other end of the conduit 35 is connected to a through-core 36, and a second bracket 37 is fixedly connected to the outer surface of the through-core 36.

[0030] Please see Figure 2 , Figure 3 and Figure 7 The second bracket 37 is fixed to the inner top surface of the cover 3, the through-core 36 is sleeved with the pump shaft 8, and the output end of the through-core 36 is rotatably connected to the end face of the nest 10 through a bearing. There are four piston rods 32 and four sleeves 33. The four piston rods 32 and four sleeves 33 are located at the four corners of the base plate 2. The total amount of gas in the sleeves 33, flow channels 34, conduits 35 and through-core 36 is constant.

[0031] Specifically, during the lifting process of the lifting platform 31, the piston rod 32 on the lifting platform 31 is raised, thereby reducing the air pressure at the bottom of the sleeve 33. This allows the sleeve 33 to draw gas from the through-hole top 36 through the flow channel 34 and the guide tube 35, thereby reducing the thrust at the output end of the through-hole top 36. The greater the height of the lifting platform 31, the lower the thrust at the output end of the through-hole top 36, and the lower the thrust required for the axial movement of the nest 10. Therefore, the torque converted from the fitting convex surface 12 and the fitting concave surface 15 is lower, achieving the purpose of adjusting overload protection. Moreover, the overload protection can adapt to the size changes of the motor 21, so that the coaxiality calibration and overload protection adjustment are carried out simultaneously without secondary measurement and adjustment, saving time and effort while improving the degree of automation of the device.

[0032] The working principle and usage process of this invention: During the assembly of the motor 21, the motor 21 is connected to the lifting platform 31. At this time, the lifting platform 31 is at its lowest height and close to the base plate 2, so that the height of the transmission shaft 20 on the motor 21 is lower than the height of the pump shaft 8, and the height of the axis of the motor coupling 17 is lower than the height of the axis of the pump coupling 13. Consequently, the inner half ring 22 is located below the outer half ring 23. Then, the rotating shaft 26 on the base plate 2 is rotated, so that the main bevel gear 27 on the rotating shaft 26 drives the secondary bevel gear 28 to rotate, so that the lead screw 29 on the secondary bevel gear 28 drives the push rod 30 to move. The lifting platform 31 on the push rod 30 is limited by the piston rod 32 and cannot rotate on its own, so the push rod 30 rises under the drive of the lead screw 29, thereby lifting the motor 21, indirectly causing the motor 21 to be lifted. The inner half-ring 22 on the motor coupling 17 approaches the outer half-ring 23 until the inner half-ring 22 and the outer half-ring 23 are tightly attached. During this process, if there is a horizontal gap between the inner half-ring 22 and the outer half-ring 23, the convex surface of the inner half-ring 22 will press the end of the outer half-ring 23. The spatial position of the outer half-ring 23 remains constant, so that the inner half-ring 22 moves and rises under the guidance of the roller 24 until the inner half-ring 22 and the outer half-ring 23 are tightly attached and concentric. At this time, the axis of the transmission shaft 20 and the axis of the pump shaft 8 are automatically collinear, achieving the purpose of rapid coaxiality calibration. This avoids the pump coupling 13 and the motor coupling 17 bearing additional radial force, reduces wear and vibration, thereby reducing maintenance costs and safety hazards. At the same time, it simplifies the coaxiality calibration process, eliminating the need to repeatedly measure and adjust the position of the motor 21, saving time and effort while ensuring coaxiality. It should be further explained that when the inner half ring 22 produces horizontal displacement, the motor coupling 17 on the inner half ring 22 synchronously drives the transmission shaft 20 and the motor 21 to translate, so that the motor 21 translates on the lifting platform 31 until the adjustment is completed, and then the motor 21 and the lifting platform 31 are fixed with fastening bolts. When the pump body 5 experiences overload conditions such as impeller jamming or pipeline blockage, the pump shaft 8 cannot rotate. The retaining strip 9 on the pump shaft 8 engages with the retaining groove 11 on the nest 10, causing the nest 10 to rotate synchronously with the pump shaft 8. If the pump shaft 8 cannot rotate, the nest 10 also cannot rotate. Meanwhile, the motor 21 continues to operate and continuously increases its torque, causing the motor coupling 17 on the drive shaft 20 to drive the pump coupling 13 to rotate. The mating concave surface 15 on the pump coupling 13 engages with the mating convex surface 12 on the nest 10, and the mating convex surface 12... The mating concave surface 15 can convert torque into axial thrust, which causes the mating convex surface 12 to drive the nest 10 to translate towards the pump shaft 8. During this process, the nest 10 simultaneously squeezes the output end of the through-core top 36 until the axial thrust of the nest 10 is greater than the thrust of the output end of the through-core top 36. At this time, the mating convex surface 12 separates from the mating concave surface 15, and the transmission shaft 20 can rotate again, preventing the torque of the motor 21 from continuously increasing, achieving the purpose of overload protection, thereby preventing the motor 21 from overload and burning out, reducing safety accidents, and improving the operational safety of the entire hot water circulation system. During the above process, as the lifting platform 31 rises, the piston rod 32 on the lifting platform 31 rises, thereby reducing the air pressure at the bottom of the sleeve 33. This allows the sleeve 33 to draw gas from the through-hole top 36 through the flow channel 34 and the guide tube 35, thereby reducing the thrust at the output end of the through-hole top 36. The greater the height of the lifting platform 31, the lower the thrust at the output end of the through-hole top 36, and the lower the thrust required for the axial movement of the nest 10. Therefore, the torque converted from the fitting convex surface 12 and the fitting concave surface 15 is lower, achieving the purpose of adjusting overload protection. Moreover, the overload protection can adapt to changes in the size of the motor 21, allowing coaxiality calibration and overload protection adjustment to be performed simultaneously without secondary measurement and adjustment. This saves time and effort while improving the degree of automation of the device and completing the operation.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A hot water circulating pump with a coupling, characterized in that, The system includes a base (1), on which a base plate (2), a protective cover (3), a first bracket (4), and a pump body (5) are fixedly connected. An organic seal cover (6) is installed on the end face of the pump body (5). One end of a suspension (7) is fixedly connected to the end face of the organic seal cover (6), and the other end of the suspension (7) is fixedly connected to the first bracket (4). A pump shaft (8) is sleeved on the central axis of the organic seal cover (6) and the suspension (7). An impeller is fixedly connected to one end of the pump shaft (8), and a retaining strip (9) is fixedly connected to the other end of the pump shaft (8). A nest (10) is sleeved on the end of the pump shaft (8). A groove (11) is opened on the inner surface of the nest (10), and an engagement protrusion (12) is provided on the end face of the nest (10). 0) A pump coupling (13) is provided on the outer sleeve. One end of the pump coupling (13) is fixedly connected to an outer half ring (23). The other end of the pump coupling (13) is provided with a groove (14). The end face of the groove (14) is provided with a fitting concave surface (15). A pin (16) is fixedly connected to the outer edge of the pump coupling (13). A motor coupling (17) is sleeved on the end of the pin (16). An elastic ring (18) is provided between the pin (16) and the motor coupling (17). A retaining ring (19) is provided between the motor coupling (17) and the pump coupling (13). One end of a transmission shaft (20) is fixedly connected to the central axis of the motor coupling (17). A motor (21) is installed on the other end of the transmission shaft (20).

2. The hot water circulating pump with coupling according to claim 1, characterized in that: The protective cover (3) surrounds the motor coupling (17) and the pump coupling (13). The impeller on the pump shaft (8) is located inside the pump body (5). Multiple locking strips (9) are provided. The multiple locking strips (9) are evenly distributed about the central axis of the pump shaft (8). The locking strips (9) are engaged with the locking grooves (11).

3. The hot water circulating pump with coupling according to claim 1, characterized in that: The fitting convex surface (12) and the fitting concave surface (15) are fitted together and connected. The fitting convex surface (12) and the fitting concave surface (15) can convert torque into axial thrust. The nest (10) is sleeved with the groove (14). The elastic ring (18) and the retaining ring (19) are both sleeved with the pin (16). The axis of the outer half ring (23) coincides with the axis of the pump shaft (8).

4. The hot water circulating pump with coupling according to claim 1, characterized in that: An inner half-ring (22) is fixedly connected to the end face of the motor coupling (17), and rollers (24) are hinged to both ends of the outer half-ring (23). An inner cavity (25) and a flow channel (34) are opened in the base plate (2), and a rotating shaft (26) is rotatably connected to the side wall of the base plate (2). A main bevel gear (27) is fixedly connected to the end of the rotating shaft (26), and a secondary bevel gear (28) is meshed with the outer surface of the main bevel gear (27). A lead screw (29) is fixedly connected to the central axis of the secondary bevel gear (28), and a push rod (30) is threadedly connected to the outer surface of the lead screw (29). A lifting platform (31) is fixedly connected to the top surface of the push rod (30).

5. The hot water circulating pump with coupling according to claim 4, characterized in that: The axis of the inner half ring (22) coincides with the axis of the outer half ring (23), the axis of the inner half ring (22) coincides with the axis of the transmission shaft (20), and the inner half ring (22) and the outer half ring (23) are in close contact. The main bevel gear (27) and the secondary bevel gear (28) are both located in the inner cavity (25).

6. The hot water circulating pump with coupling according to claim 4, characterized in that: The rotating shaft (26) is sleeved with the base plate (2), the lead screw (29) and the top rod (30) have self-locking properties, the top surface of the lifting platform (31) is slidably connected with the bottom surface of the motor (21), and the lead screw (29) is rotatably connected with the base plate (2).

7. The hot water circulating pump with coupling according to claim 4, characterized in that: The bottom surface of the lifting platform (31) is fixedly connected to one end of a piston rod (32), and the other end of the piston rod (32) is fitted with a sleeve (33). The sleeve (33) is fixedly connected to the base plate (2). One end of the flow channel (34) is connected to the sleeve (33), and the other end of the flow channel (34) is connected to one end of a conduit (35). The other end of the conduit (35) is connected to a through-core top (36), and the outer surface of the through-core top (36) is fixedly connected to a second bracket (37).

8. The hot water circulating pump with coupling according to claim 7, characterized in that: The second bracket (37) is fixed to the inner top surface of the cover (3), the through-core top (36) is sleeved with the pump shaft (8), and the output end of the through-core top (36) is rotatably connected to the end face of the nest (10) through the bearing. There are four piston rods (32) and four sleeves (33). The four piston rods (32) and four sleeves (33) are located at the four corners of the base plate (2). The total amount of gas in the sleeve (33), flow channel (34), conduit (35) and through-core top (36) is constant.

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