Anti-inversion circulating water pump

Abstract

The invention relates to the technical field of circulating water pumps, in particular to an anti-inversion circulating water pump which comprises a pump body, a water inlet pipe is arranged at the top of the pump body, one end of a middle shaft is in running fit with the inner wall of the pump body, and the other end of the middle shaft sequentially penetrates through the pump body and a protective cover and then is fixed to the output end of a motor. The motor is fixed with the inner wall of the protective cover; at least one group of impellers is arranged in the pump body and is fixed with the periphery of the middle shaft, a limiting assembly is arranged on the surface of the middle shaft in the protective cover, when the water pump rotates reversely, the limiting assembly is fixed with the protective cover, and the limiting assembly is controlled by inertia, so that manual control of a user is not needed; when the water pump rotates reversely, the middle shaft can be automatically locked, and the water pump is prevented from rotating reversely.

Description

Technical Field

[0001] The present invention relates to the technical field of circulating water pumps, and in particular to an anti-reversal circulating water pump. Background Art

[0002] The circulating water pumps, core equipment in the cold end of power plants, are mostly large, vertical, single-stage, single-suction, mixed-flow pumps with retractable rotors. Each circulating water pump outlet is equipped with a 45-second, two-stage shutoff, hydraulically controlled check butterfly valve with a nominal diameter of DN2200. Due to the rigid seal and large nominal diameter of the hydraulically controlled check butterfly valves, coupled with the extensive use of municipal reclaimed water, scale and other foreign matter easily form on the valve sealing surfaces when the valves are normally open. This makes it difficult for large butterfly valves to achieve a tight seal, making it very prone to reverse operation after the circulating water pumps are shut down. Reversing and restarting large circulating water pumps can subject the pump shaft to significant torque, compromising pump safety.

[0003] The Chinese utility model patent with patent publication number CN207406521U discloses a water pump anti-reverse device, in which the anti-reverse card and the anti-reverse ratchet are correspondingly arranged. When the water pump is stopped, the anti-reverse card and the anti-reverse ratchet engage with each other and self-lock; when the water pump is started, the anti-reverse ratchet pushes the anti-reverse card upward, effectively preventing the water pump from reversing. However, the user needs to manually control the anti-reverse device to prevent the water pump from reversing, which is inconvenient to operate. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides an anti-reverse circulating water pump, whose limit assembly is controlled by inertia and does not require manual control by the user. When the water pump reverses, the central axis can be automatically locked to prevent the water pump from reversing.

[0005] The present invention provides the following technical solutions:

[0006] A circulating water pump with anti-reversal includes a pump body, a water inlet pipe is provided on the top of the pump body, one end of the central axis is rotatably engaged with the inner wall of the pump body, the other end of the central axis passes through the pump body and the protective cover in sequence and is fixed to the output end of the motor, and the motor is fixed to the inner wall of the protective cover; at least one set of impellers is arranged inside the pump body and fixed to the outer periphery of the central axis, and a limiting component is provided on the surface of the central axis inside the protective cover. When the water pump reverses, the limiting component is fixed to the protective cover.

[0007] Furthermore, along the direction of water flow, a connecting cavity and an installation cavity are sequentially provided inside the pump body, and the impeller is provided inside the installation cavity; a plurality of one-way flip plates are rotatably provided on the inner wall of the installation cavity; a water channel is opened on the inner wall of the pump body, and both ends of the water channel are connected with the connecting cavity and the installation cavity; when the water pump is reversed, the one-way flip plate is separated from the pump body.

[0008] Furthermore, the one-way flip plate includes a rotating shaft, a baffle is fixed on the outer periphery of the rotating shaft, and an extension section is provided at one end of the baffle; when the water pump rotates forward, the extension section abuts against the outer wall of the installation cavity.

[0009] Furthermore, a shaft sleeve is fixed to the outer periphery of the rotating shaft, two ends of the rotating shaft pass through the shaft sleeve and rotate in conjunction with the side wall of the pump body, and a coil spring is provided between the rotating shaft and the shaft sleeve.

[0010] Furthermore, two extension sections are centrally symmetrically provided at both ends of the baffle. When the water pump rotates forward, the two extension sections respectively abut against the side wall of the installation cavity on one side.

[0011] Furthermore, a bracket is fixed to the bottom of the pump body.

[0012] Furthermore, the limiting assembly includes a rotating plate and a pawl, the rotating plate is fixed to the outer periphery of the central axis, one end of the pawl is rotatably engaged with the rotating plate, and the inner wall of the protective cover is provided with a pawl groove matching the pawl; when the water pump is reversed, the pawl is engaged with the pawl groove.

[0013] Furthermore, the limiting assembly also includes a spring sheet and a connecting piece, the connecting piece is fixed to the surface of the rotating plate and matches the number of the pawls; a protrusion is provided at one end of the pawl that is engaged with the pawl groove, one end of the spring sheet is fixed to the connecting piece, and the other end of the spring sheet is fixed to the protrusion of the pawl.

[0014] Furthermore, the rotating plate is a regular polygon, and a ratchet is provided on the outer wall of each side of the rotating plate.

[0015] Furthermore, the mass of the rotating plate is smaller than the mass of the pawl.

[0016] Furthermore, it also includes a hydraulic amplification mechanism, which is detachably fixed to the outer wall of the pump body, and a pressure sensing chamber and an annular cavity are provided inside the hydraulic amplification mechanism, and several groups of piston units are evenly distributed circumferentially in the pressure sensing chamber, and the piston unit includes an arc-shaped main piston that slides radially along the pressure sensing chamber, and a pressure transmission hole is provided between the pressure sensing chamber and the mounting chamber, and the entrance of the pressure transmission hole is covered with a hydraulic oil isolation membrane, the outer end of the arc-shaped main piston is connected to the auxiliary piston, and the other end of the auxiliary piston passes through the pressure sensing chamber and extends into the annular cavity, and a lever amplifier is provided in the annular cavity, and the lever amplifier includes a primary lever and a secondary lever, and the primary lever is connected to the ball joint at the end of the auxiliary piston, and the primary lever rotates in the annular cavity through a fixed rotating shaft, and the secondary lever is hinged to the end of the primary lever, and the other end of the secondary lever extends to the inside of the protective cover, and the secondary lever is used to ensure that the limit assembly responds in advance.

[0017] Furthermore, a guide rail is provided at the end of the secondary lever, and a counterweight block is slidably provided on the guide rail; a limited motion plate is provided on the central axis, a wedge-shaped impact head is provided at the end of the counterweight block, and an inclined impact surface is provided on the wedge-shaped impact head; a reverse thrust slope surface is provided on the limited motion plate, and the reverse thrust slope surface matches the inclined impact surface to ensure the reverse rotation of the limited motion plate.

[0018] The present invention has the following beneficial technical effects:

[0019] 1. The limit assembly of the present invention is controlled by inertia and does not require manual control by the user. When the water pump reverses, the central axis can be automatically locked to prevent the water pump from reversing.

[0020] 2. When the water pump of the present invention rotates forward, water flows into the pump body through the water inlet pipe and the input hole, then enters the installation cavity equipped with the impeller after passing through the connecting cavity, and is discharged from the pump body through the output hole after being accelerated by the impeller. At this time, the impact on the one-way flip plate will not cause the one-way flip plate to open. Since the impeller will generate dust suction on the water flow, only a small amount of water will enter the water channel.

[0021] 3. When the water pump of the present invention rotates in reverse, the direction of the water flow driven by the impeller is opposite to that when rotating forward. The impeller drives the water flow to impact the one-way flip plate and causes the one-way flip plate to open. After the one-way flip plate opens, the water flow inside the installation cavity enters the water channel and is finally discharged into the connecting cavity. This process reduces the water flow rolled up by the reverse rotation of the impeller in the installation cavity, and can also make the water flow input into the connecting cavity by the reverse rotation of the impeller and the water flow input into the connecting cavity by the water channel form a counter-action, thereby reducing the speed of the impeller reversal and reducing the damage to the device caused by the impeller reversal.

[0022] 4. With the rotating shaft as the reference, the baffle is set at an angle. One end of the baffle is interlocked with the outer wall of the installation cavity through the extension section, and the other end of the baffle is in contact with the side wall of the installation cavity. When the impeller rotates forward, the water flow in the installation cavity impacts the end of the baffle in contact with the side wall of the installation cavity. The force impacting the baffle is borne by the extension section, and the baffle does not rotate; when the impeller rotates backward, the water flow in the installation cavity impacts the end of the baffle equipped with the extension section, and the baffle rotates.

[0023] 5. The mass of the rotating plate of the present invention is smaller than that of the pawl, so the inertia formed by the pawl is greater than the inertia formed by the rotating plate. When the limit assembly is reversed, the pawl is more easily separated from the rotating plate, making it easier for the pawl to engage with the pawl groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 is a structural diagram of the impeller; Figure 4 for Figure 3 Schematic diagram of the structure of area A; Figure 5 It is a structural diagram of the limit component; Figure 6 This is a schematic diagram of the structure of the limit assembly when preventing reverse rotation; Figure 7 Schematic diagram of the hydraulic amplification mechanism.

[0025] The symbols in the accompanying drawings are:

[0026] 1. Pump body; 11. Input hole; 12. Output hole; 13. Central axis; 14. One-way flip plate; 141. Rotating shaft; 142. Bushing; 143. Baffle; 144. Coil spring; 145. Extension section; 15. Water channel; 16. Connecting chamber; 17. Mounting chamber; 18. Motor; 2. Water inlet pipe; 3. Bracket; 4. Protective cover; 41. Pawl groove; 5. Impeller; 6. Limit assembly; 61. Rotating plate; 62. Pawl; 63. Spring leaf; 64. Connecting piece; 91. Pressure sensing chamber; 93. Annular chamber; 95. Stop plate; 911. Pressure transmission hole; 921. Arc-shaped main piston; 922. Auxiliary piston; 931. Primary lever; 932. Secondary lever; 933. Fixed rotating shaft; 941. Counterweight; 98. Wedge-shaped impact head; 9. Hydraulic amplification mechanism. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] See also Figures 1-6 , Example 1: A circulating water pump with an anti-reverse function, comprising a pump body 1, a water inlet pipe 2 is provided on the top of the pump body 1, one end of the central axis 13 is rotatably matched with the inner wall of the pump body 1, and the other end of the central axis 13 is successively passed through the pump body 1 and the protective cover 4 and is fixed to the output end of the motor 18, and the motor 18 is fixed to the inner wall of the protective cover 4; at least one set of impellers 5 is arranged inside the pump body 1 and fixed to the outer periphery of the central axis 13, and a limit assembly 6 is provided on the surface of the central axis 13 inside the protective cover 4. When the water pump is reversed, the limit assembly 6 is fixed to the protective cover 4.

[0030] In the present invention, the central axis 13 of the water pump is not only connected to the impeller 5, but also connected to the limit assembly 6, and the protective cover 4 is used to separate the limit assembly 6 from the impeller 5 to prevent water from entering the limit assembly 6 during the operation of the water pump. When the water pump rotates forward, the limit assembly 6 rotates synchronously with the impeller 5. When the water pump rotates backward, the limit assembly 6 is fixed to the inner wall of the protective cover 4, thereby preventing the central axis 13 from continuing to rotate, that is, preventing the water pump from reversing.

[0031] Furthermore, along the direction of water flow, a connecting chamber 16 and an installation chamber 17 are sequentially provided inside the pump body 1, and the impeller 5 is arranged inside the installation chamber 17; a plurality of one-way flip plates 14 are rotatably provided on the inner wall of the installation chamber 17; a water channel 15 is opened on the inner wall of the pump body 1, and both ends of the water channel 15 are connected with the connecting chamber 16 and the installation chamber 17; when the water pump is reversed, the one-way flip plate 14 is separated from the pump body 1.

[0032] When the water pump rotates forward, the water flows into the pump body 1 through the water inlet pipe 2 and the input hole 11, and then enters the installation cavity 17 equipped with the impeller 5 after passing through the connecting cavity 16. After being accelerated by the impeller 5, it is discharged from the pump body through the output hole 12. At this time, the impact on the one-way flip plate 14 will not cause the one-way flip plate 14 to open. Since the impeller 5 will produce dust suction on the water flow, only a small amount of water will flow into the water channel 15. When the impeller 5 rotates reversely, the direction of the water flow driven by the impeller 5 is opposite to that when rotating forward. 5 drives the water flow to impact the one-way flip plate 14 and open the one-way flip plate 14. After the one-way flip plate 14 opens, the water flow inside the installation cavity 17 enters the water channel 15 and is finally discharged into the communication cavity 16. This process not only reduces the water flow rolled up by the reverse rotation of the impeller 5 in the installation cavity 17, but also allows the water flow input into the communication cavity 16 by the impeller 5 to offset the water flow input into the communication cavity 16 by the water channel 15, thereby reducing the speed of the reverse rotation of the impeller 5 and reducing the damage to the device caused by the reverse rotation of the impeller 5.

[0033] Furthermore, the one-way flip plate 14 includes a rotating shaft 141 , a baffle 143 is fixed to the outer periphery of the rotating shaft 141 , and an extension section 145 is provided at one end of the baffle 143 ; when the water pump rotates forward, the extension section 145 abuts against the outer wall of the installation cavity 17 .

[0034] With the rotating shaft 141 as a reference, the baffle 143 is arranged at an angle, one end of the baffle 143 is interlocked with the outer wall of the installation cavity 17 through the extension section 145, and the other end of the baffle 143 abuts against the side wall of the installation cavity 17. When the impeller 5 rotates forward, the water flow in the installation cavity 17 impacts the end of the baffle 143 abutting against the side wall of the installation cavity 17, and the force impacting the baffle 143 is borne by the extension section 145, and the baffle 143 does not rotate; when the impeller 5 rotates backward, the water flow in the installation cavity 17 impacts the end of the baffle 143 equipped with the extension section 145, and the baffle 143 rotates.

[0035] Furthermore, a shaft sleeve 142 is fixed to the outer periphery of the rotating shaft 141 , and both ends of the rotating shaft 141 pass through the shaft sleeve 142 and rotate with the side wall of the pump body 1 . A coil spring 144 is provided between the rotating shaft 141 and the shaft sleeve 142 .

[0036] When the rotating shaft 141 is impacted by the water flow and rotates, the coil spring 144 rotates at the same time, so that the coil spring 144 can apply a restoring force to the baffle 143; when the one-way flip plate 14 does not rotate, the coil spring 144 can also play a certain fixing role on the one-way flip plate 14.

[0037] Furthermore, two extension sections 145 are centrally symmetrically provided at both ends of the baffle 143 . When the water pump rotates forward, the two extension sections 145 respectively abut against the side wall of the installation cavity 17 on one side.

[0038] The extension sections 145 on both sides of the baffle 143 respectively abut against the side wall of the installation cavity 17 on one side, so that the position of the one-way flip plate 14 is more stable when the impeller 5 rotates forward.

[0039] Furthermore, a bracket 3 is fixed to the bottom of the pump body 1 .

[0040] Furthermore, the limiting assembly 6 includes a rotating plate 61 and a pawl 62. The rotating plate 61 is fixed to the outer periphery of the central axis 13. One end of the pawl 62 rotates with the rotating plate 61. The inner wall of the protective cover 4 is provided with a pawl groove 41 that matches the pawl 62. When the water pump is reversed, the pawl 62 is engaged with the pawl groove 41.

[0041] When the impeller 5 rotates forward, the pawl 62 is in contact with the rotating plate 61, and the limit assembly 6 does not work; when the impeller 5 rotates backward, the pawl 62 is separated from the rotating plate 61, and the pawl 62 rotates outward and engages with the pawl groove 41 to prevent the central shaft 13 from continuing to rotate.

[0042] Furthermore, the limiting assembly 6 also includes a spring sheet 63 and a connecting piece 64, the connecting piece 64 is fixed to the surface of the rotating plate 61 and matches the number of the pawls 62; the end of the pawl 62 that is engaged with the pawl groove 41 is provided with a protrusion, one end of the spring sheet 63 is fixed to the connecting piece 64, and the other end of the spring sheet 63 is fixed to the protrusion of the pawl 62.

[0043] When the middle shaft 13 reverses and the pawl 62 rotates, the pawl 62 drives the spring sheet 63 to stretch, so that the spring sheet 63 applies a restoring force to the rotated pawl 62, thereby facilitating the restoration of the pawl 62.

[0044] Furthermore, the rotating plate 61 is a regular polygon, and a pawl 62 is provided on the outer wall of each side of the rotating plate 61 .

[0045] A certain number of ratchets 62 is provided according to actual use requirements. The more ratchets 62 there are, the more firmly the center shaft 13 is fixed when the center shaft 13 is reversed.

[0046] Furthermore, the mass of the rotating plate 61 is smaller than the mass of the pawl 62 .

[0047] Since the mass of the rotating plate 61 is smaller than the mass of the pawl 62, the inertia formed by the pawl 62 is greater than the inertia formed by the rotating plate 61. When the limit assembly 6 is reversed, the pawl 62 is more easily separated from the rotating plate 61, making it easier for the pawl 62 to engage with the pawl groove 41.

[0048] The method of using this embodiment 1 is as follows:

[0049] When the water pump rotates forward, the limit assembly 6 rotates synchronously with the impeller 5. The water flows into the pump body 1 through the water inlet pipe 2 and the input hole 11, and then enters the installation cavity 17 equipped with the impeller 5 after passing through the connecting cavity 16. After being accelerated by the impeller 5, the water is discharged from the pump body through the output hole 12. At this time, the impact on the one-way flip plate 14 will not cause the one-way flip plate 14 to open. Since the impeller 5 will generate dust suction on the water flow, only a small amount of water will enter the water channel 15.

[0050] When the water pump is reversed, the impeller 5 reverses, and the direction of the water flow driven by the impeller 5 is opposite to that when it is rotated forward. The impeller 5 drives the water flow to impact the one-way flip plate 14 and open the one-way flip plate 14. After the one-way flip plate 14 is opened, the water flow inside the installation cavity 17 enters the water channel 15 and is finally discharged in the connecting cavity 16. This process reduces the water flow rolled up by the reverse rotation of the impeller 5 in the installation cavity 17, and can also make the water flow input into the connecting cavity 16 by the reverse rotation of the impeller 5 and the water flow input into the connecting cavity 16 by the water channel 15 form a counter-action, so as to reduce the speed of the reverse rotation of the impeller 5 and reduce the damage to the device caused by the reverse rotation of the impeller 5. When the rotating shaft 141 rotates, the coil spring 144 rotates at the same time, so that the coil spring 144 can apply a restoring force to the baffle 143; at the same time, the pawl 62 separates from the rotating plate 61, and the pawl 62 rotates outward and engages with the pawl groove 41 to prevent the central shaft 13 from continuing to rotate. Since the mass of the rotating plate 61 is less than the mass of the pawl 62, the inertia formed by the pawl 62 is greater than the inertia formed by the rotating plate 61, and the pawl 62 is easier to separate from the rotating plate 61, thereby making it easier for the pawl 62 to engage with the pawl groove 41, thereby preventing the central shaft 13 from continuing to rotate, that is, preventing the water pump from reversing.

[0051] Example 2:

[0052] The anti-reverse circulating water pump of this embodiment also includes a hydraulic amplification mechanism 9, which is detachably fixed to the outer wall of the pump body 1. A pressure sensing chamber 91 and an annular chamber 93 are provided inside the hydraulic amplification mechanism 9. Several groups of piston units are evenly distributed circumferentially in the pressure sensing chamber 91. The piston unit includes an arc-shaped main piston 921 that slides radially along the pressure sensing chamber 91. A pressure transmission hole 911 is provided between the pressure sensing chamber 91 and the installation chamber 17. The inlet of the pressure transmission hole 911 is covered with a hydraulic oil isolation membrane. The outer end of the arc-shaped main piston 921 is connected to the auxiliary piston 922. The other end of the auxiliary piston 922 is connected to the auxiliary piston 922. It passes through the pressure sensing cavity 91 and extends into the annular cavity 93, and a sealing ring is arranged between the auxiliary piston 922 and the pressure sensing cavity 91 and the inner wall of the annular cavity 93. A lever amplifier is arranged in the annular cavity 93, and the lever amplifier includes a primary lever 931 and a secondary lever 932. The primary lever 931 is connected to the ball joint at the end of the auxiliary piston 922, and the primary lever 931 rotates in the annular cavity 93 through the fixed rotating shaft 933. The secondary lever 932 is hinged to the end of the primary lever 931, and the other end of the secondary lever 932 extends to the inside of the protective cover 4, and the secondary lever 932 is used to ensure that the limit assembly 6 responds in advance.

[0053] A guide rail is provided at the end of the secondary lever 932, and a counterweight block 941 is slidably provided on the guide rail; a limited motion plate 95 is provided on the central axis 13, and a wedge-shaped impact head 98 is provided at the end of the counterweight block 941, and an inclined impact surface is provided on the wedge-shaped impact head 98. A reverse thrust slope surface is provided on the limited motion plate 95, and the reverse thrust slope surface matches the inclined impact surface to ensure that the limited motion plate 95 rotates in the reverse direction.

[0054] Specifically, when the water pump is reversed, the reverse water pressure in the installation cavity 17 is transmitted to the pressure sensing cavity 91 through the pressure transmission hole 911 covered with the hydraulic oil isolation membrane 97, pushing the arc-shaped main piston 921 to retract radially, driving the auxiliary piston 922 to move axially; the auxiliary piston 922 pushes the first-level lever 931 to rotate around the fixed rotating shaft 933, driving the second-level lever 932 to swing toward the inside of the protective cover 4; the guide rail at the end of the second-level lever 932 drives the counterweight block 941 to slide and accelerate, and the wedge-shaped impact head 98 at the end of the counterweight block 941 hits the reverse thrust slope surface of the upper limit plate 95 on the central axis 13 with an inclined impact surface, converting the linear impact force into a reverse rotation torque, forcing the limit plate 95 to rotate in the reverse direction, and then driving the rotating plate 61 to rotate so that the pawl 62 is instantly stuck in the pawl groove 41, realizing the mechanical locking of the central axis 13

[0055] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A circulating water pump with an anti-reversal function, comprising a pump body (1), a water inlet pipe (2) provided on the top of the pump body (1), one end of a central axis (13) rotatably engaged with the inner wall of the pump body (1), the other end of the central axis (13) sequentially passing through the pump body (1) and the protective cover (4) and then being fixed to the output end of the motor (18), the motor (18) being fixed to the inner wall of the protective cover (4); at least one set of impellers (5) being provided inside the pump body (1) and fixed to the outer periphery of the central axis (13), characterized in that: A limit assembly (6) is provided on the surface of the central axis (13) inside the protective cover (4); when the water pump is reversed, the limit assembly (6) is fixed to the protective cover (4).

2. The anti-reversal circulating water pump according to claim 1, characterized in that: Along the direction of water flow, a communication cavity (16) and an installation cavity (17) are sequentially provided inside the pump body (1), and the impeller (5) is provided inside the installation cavity (17); a plurality of one-way flip plates (14) are rotatably provided on the inner wall of the installation cavity (17); a water channel (15) is provided on the inner wall of the pump body (1), and both ends of the water channel (15) are connected to the communication cavity (16) and the installation cavity (17); when the water pump is reversed, the one-way flip plates (14) are separated from the pump body (1).

3. The anti-reversal circulating water pump according to claim 2, characterized in that: The one-way flip plate (14) includes a rotating shaft (141), a baffle (143) is fixed to the outer periphery of the rotating shaft (141), and an extension section (145) is provided at one end of the baffle (143); when the water pump rotates forward, the extension section (145) abuts against the outer wall of the installation cavity (17).

4. The anti-reversal circulating water pump according to claim 3, characterized in that: A shaft sleeve (142) is fixed to the outer periphery of the rotating shaft (141), both ends of the rotating shaft (141) pass through the shaft sleeve (142) and are rotatably engaged with the side wall of the pump body (1), and a coil spring (144) is provided between the rotating shaft (141) and the shaft sleeve (142).

5. The anti-reverse circulating water pump according to claim 2, characterized in that: Two extension sections (145) are centrally symmetrically provided at both ends of the baffle (143). When the water pump rotates forward, the two extension sections (145) respectively abut against the side wall of the installation cavity (17) on one side.

6. The anti-reversal circulating water pump according to claim 1, characterized in that: The limiting assembly (6) comprises a rotating plate (61) and a pawl (62); the rotating plate (61) is fixed to the outer periphery of the central shaft (13); one end of the pawl (62) is rotatably engaged with the rotating plate (61); the inner wall of the protective cover (4) is provided with a pawl groove (41) that matches the pawl (62); when the water pump is reversed, the pawl (62) is engaged with the pawl groove (41).

7. The anti-reversal circulating water pump according to claim 6, characterized in that: The limiting assembly (6) further comprises a spring sheet (63) and a connecting piece (64), wherein the connecting piece (64) is fixed to the surface of the rotating plate (61) and matches the number of the pawls (62); one end of the pawl (62) that is engaged with the pawl groove (41) is provided with a protrusion, one end of the spring sheet (63) is fixed to the connecting piece (64), and the other end of the spring sheet (63) is fixed to the protrusion of the pawl (62).

8. The anti-reverse circulating water pump according to claim 6, characterized in that: The rotating plate (61) is a regular polygon, and a pawl (62) is provided on each side outer wall of the rotating plate (61). The mass of the rotating plate (61) is smaller than the mass of the pawl (62).

9. The anti-reversal circulating water pump according to claim 6, characterized in that: The invention also includes a hydraulic amplification mechanism (9), which is detachably fixed to the outer wall of the pump body (1). A pressure sensing chamber (91) and an annular chamber (93) are provided inside the hydraulic amplification mechanism (9). Several groups of piston units are evenly distributed in the circumferential direction of the pressure sensing chamber (91). The piston unit includes an arc-shaped main piston (921) that slides radially along the pressure sensing chamber (91). A pressure transmission hole (911) is provided between the pressure sensing chamber (91) and the installation chamber (17). The inlet of the pressure transmission hole (911) is covered with a hydraulic oil isolation membrane. The outer end of the arc-shaped main piston (921) is connected to an auxiliary piston (922). The other end of the auxiliary piston (922) passes through the pressure sensing cavity (91) and extends into the annular cavity (93). A lever amplifier is provided in the annular cavity (93). The lever amplifier includes a primary lever (931) and a secondary lever (932). The primary lever (931) is connected to a ball joint at the end of the auxiliary piston (922), and the primary lever (931) rotates in the annular cavity (93) through a fixed rotating shaft (933). The secondary lever (932) is hinged to the end of the primary lever (931). The other end of the secondary lever (932) extends into the interior of the protective cover (4). The secondary lever (932) ensures that the limit assembly (6) responds in advance.

10. The anti-reverse circulating water pump according to claim 9, characterized in that: A guide rail is provided at the end of the secondary lever (932), and a counterweight (941) is slidably provided on the guide rail; a limited disk (95) is provided on the central shaft (13), and a wedge-shaped impact head (98) is provided at the end of the counterweight (941), and an inclined impact surface is provided on the wedge-shaped impact head (98); a reverse thrust slope is provided on the limited disk (95), and the reverse thrust slope matches the inclined impact surface to ensure that the limited disk (95) rotates in the reverse direction.

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