Self-priming pump with more stable flow detection

Abstract

The utility model relates to a self-priming pump with more stable flow detection, which comprises a pump shell, a water inlet and a water outlet are arranged on the pump shell, a water inlet channel communicated with the water inlet and a water outlet channel communicated with the water outlet are arranged in the pump shell, and a flow switch used for detecting fluid is arranged in the water outlet channel. When fluid from the water inlet flows to the water outlet channel from the water inlet channel, the fluid flows to the flow switch arranged in the water outlet channel and finally flows out of the water outlet of the pump shell, and the flow switch can control whether a motor of the self-priming pump is started or not according to the impact force of the fluid when the fluid passes through the flow switch. Due to the fact that the flow switch is arranged in the water outlet channel and located at the downstream position of the pump wheel, fluid impact force formed by the pump wheel in the water outlet channel is in a positive pressure state all the time, and the fluid impact force generated in the water outlet channel is far larger than fluid impact force in the water inlet channel. Therefore, impurities or dirt passing through or accumulated in the flow switch can be rapidly washed away, and flow detection of the self-priming pump is more stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, and particularly relates to a self-priming pump with more stable flow detection. Background Art

[0002] A water pump is a device for transporting fluids. During the operation of the water pump, when the inlet of the fluid pump is blocked due to reasons such as debris, the water pump cannot smoothly draw water from the inlet, which will cause the water pump to run idly without water. When the water pump is in a state of running idly without water for a long time, it is easy to damage the motor of the water pump. Therefore, generally, a flow switch is connected to the inlet of the water pump through a pipeline to monitor the water flow at the inlet of the fluid pump and control the start and stop of the water pump.

[0003] Traditional water pumps use a seesaw-type flow switch as the signal source for automatic start and stop of the water pump. When a foreign object gets stuck, the seesaw cannot move, and the water pump cannot start or stop. When in a state of no water, the water pump running idly is likely to be burned out. When water is needed, the water pump cannot start, causing the user to be unable to use water. Moreover, the sensitivity of the traditional seesaw-type flow switch is affected by the distance of the tempered pipe, and the sensitivity is low.

[0004] Later, some flow switches with other structures appeared. For example, "An Automatic Low-Pressure Permanent Magnet Booster Pump" disclosed in the Chinese utility model patent with the application number 202120601120.2 (the authorized announcement number is CN214617082U), which includes a housing, a motor part, a control circuit board, and a pump body with inlets and outlets. An impeller driven by the motor part is arranged in the pump body. A water flow sensing component connected thereto is arranged on the inner wall of the pump body at the inlet, and the water flow sensing component is used to detect the flow rate at the inlet, control the automatic start and stop of the pump body, and judge whether it is operating normally.

[0005] However, there are also some defects in the booster pump using such a flow switch. Since the flow switch here is installed at the inlet of the water pump and is located upstream of the impeller, the suction force received by the flow switch is caused by the negative pressure generated by the rotation of the impeller. Therefore, the generated suction force is limited. Generally, the water flow coming in from the inlet will carry some impurities or dirt. These dirt will accumulate inside the flow switch when passing through the flow switch, and the suction force generated by the negative pressure is not enough to wash out these impurities or dirt from the flow switch, ultimately resulting in the damage or failure of the flow switch and unstable flow detection of the water pump.

[0006] Therefore, how to provide a water pump that can increase the impact force on the flow switch so that impurities and dirt entering the inside of the flow switch cannot accumulate, thereby making the flow detection more stable, is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0007] The technical problem to be solved by the present utility model is to provide a self-priming pump with more stable flow detection for the above-mentioned prior art, which can increase the impact force on the flow switch so that impurities and dirt entering the inside of the flow switch cannot accumulate, thereby making the flow detection more stable.

[0008] The technical solution adopted by the present utility model to solve the above technical problems is as follows: A self-priming pump with more stable flow detection, including a pump housing, an inlet and an outlet are provided on the pump housing, an inlet passage communicating with the inlet and an outlet passage communicating with the outlet are formed inside the pump housing, a flow switch for detecting the flow rate is provided in the outlet passage, the fluid coming in from the inlet flows from the inlet passage to the outlet passage, and flows out from the outlet after passing through the flow switch built in the outlet passage, and the flow switch can control whether the motor of the self-priming pump starts according to the magnitude of the impact force of the fluid when the fluid passes through.

[0009] In order to optimize the internal structure of the pump housing so that the inlet passage and the outlet passage can be better formed inside the pump housing, preferably, an arc-shaped first partition is provided inside the pump housing, the first partition divides the inside of the pump housing into the aforementioned inlet passage and outlet passage, and the pump impeller for driving the fluid flow is located between the inlet passage and the outlet passage, so that the inlet passage and the outlet passage are interconnected.

[0010] In order to optimize the overall structure of the flow switch so that the flow switch can better detect the fluid, and at the same time for the flow switch to better discharge sewage externally, preferably, the flow switch includes a housing, a top cover and a head, a water passing cavity with upper and lower openings is formed inside the housing, a water outlet hole communicating with the water passing cavity is provided on the side of the housing, the top cover is detachably arranged at the top opening of the housing, the head is built in the water passing cavity and can move up and down relative to the housing within a set range, an induction column extending downward is provided at the bottom of the top cover, a reed switch is built in the induction column, an induction cavity is formed vertically in the head for the induction column to move up and down, the bottom opening of the induction cavity forms a water inlet hole for the fluid to enter the flow switch, a magnet adapted to the reed switch is also provided in the induction cavity, the head can move upward under the impact of water flow, and the head can control whether the motor of the self-priming pump starts through the change of the relative position between the reed switch and the magnet during the upward movement, a spring for driving the head to always move downward is provided between the head and the top cover, and a dirt discharge passage for the water flow and dirt to pass through is also formed between the induction cavity and the induction column.

[0011] In order to enable the flow switch to be better set in the water outlet channel, preferably, a second partition is provided therein. The second partition divides the water outlet channel into a first chamber and a second chamber. The first chamber communicates with the water inlet channel, and the second chamber communicates with the water outlet. A first mounting hole g for installing the top cover is formed on the pump housing. A second mounting hole for installing the housing is provided on the second partition. When the flow switch is in the installed state, the water inlet hole is located in the first chamber, and the water outlet hole is located in the second chamber.

[0012] In order to better fix the flow switch on the pump housing, preferably, an installation platform exposed outside the pump housing is provided on the top of the top cover. A third mounting hole for installing the flow switch to the pump housing by a fastener is formed through the installation platform. A sealing ring for sealing the pump housing and the top cover is also sleeved on the top cover.

[0013] In order to enable the flow switch to better control whether the motor starts or not, preferably, a control box is further provided on the upper part of the installation platform. A controller electrically connected to the reed switch is built in the control box.

[0014] In order to better form a descaling channel for impurities and dirt to pass through inside the flow switch, preferably, the cross section of the induction cavity is circular. The magnet is embedded in the inner wall of the induction cavity in a ring shape. The induction column is cylindrical to facilitate passing through the induction cavity and the magnet. The gap between the inner peripheral surface of the induction cavity and the outer peripheral surface of the induction column forms the descaling channel.

[0015] In order to optimize the matching structure between the magnet and the induction cavity, preferably, the inner peripheral surfaces of the magnet and the induction cavity are flush.

[0016] In order to restrict the head to move up and down only within a set range, preferably, a limiting boss is provided on the inner peripheral wall at the bottom opening of the housing. A limiting flange adapted to the limiting boss is formed on the outer peripheral surface of the head. In the state where the head moves downward to the set position, the limiting flange can abut against the limiting boss to restrict the head from continuing to move downward. A plurality of guiding strips are arranged vertically on the outer peripheral surface of the head. A guiding groove for restricting the guiding strips to move only up and down is formed on the inner peripheral wall at the bottom opening of the housing.

[0017] In order to better achieve a detachable connection between the top cover and the housing, preferably, a detachable structure is provided between the housing and the top cover. The detachable structure includes a clamping groove provided on the housing and a clamping block provided on the top cover. The detachable connection between the housing and the top cover is achieved through the mutual adaptation of the clamping groove and the clamping block. The clamping groove includes a locking groove and a detaching groove. The top of the detaching groove extends to the edge of the top opening of the housing. The locking groove extends circumferentially along the housing and communicates with the bottom of the detaching groove. A circular wall that can extend downward into the water passing cavity is provided at the bottom of the top cover. The clamping block is provided on the outer peripheral surface of the circular wall. In the state where the clamping block is inserted into the detaching groove from top to bottom, by rotating the top cover, the clamping block can be circumferentially clamped into or disengaged from the locking groove, so as to achieve a detachable connection between the housing and the top cover.

[0018] Compared with the prior art, the advantages of the present utility model are as follows: By providing a water inlet and a water outlet on the pump housing, and by providing a water inlet passage communicating with the water inlet and a water outlet passage communicating with the water outlet inside the pump housing, and also by providing a flow switch for detecting the fluid in the water outlet passage. When the fluid from the water inlet flows from the water inlet passage to the water outlet passage, the fluid will flow to the flow switch built in the water outlet passage and finally flow out from the water outlet of the pump housing. The flow switch can control whether the motor of the self-priming pump starts according to the magnitude of the fluid impact force when the fluid passes through. Since the flow switch is provided in the water outlet passage and is in the downstream position of the pump impeller, the fluid impact force formed by the pump impeller in the water outlet passage is always in a positive pressure state. The fluid impact force generated in the water outlet passage will be much greater than the fluid impact force in the water inlet passage. Therefore, the impurities or dirt passing through or accumulating inside the flow switch can be quickly washed away, avoiding the drawback in the prior art that it is difficult to wash out the impurities or dirt from the flow switch due to insufficient suction force generated by negative pressure, making the flow detection of this self-priming pump more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of this embodiment;

[0020] Figure 2 is an exploded state structural schematic diagram of this embodiment;

[0021] Figure 3 is an internal structural schematic diagram of this embodiment;

[0022] Figure 4 is a three-dimensional structural schematic diagram of the flow switch in this embodiment;

[0023] Figure 5 is an exploded state structural schematic diagram of the flow switch in this embodiment;

[0024] Figure 6 is a cross-sectional view schematic diagram of the flow switch in this embodiment. Detailed implementation manners

[0025] The following further describes the present utility model in detail in conjunction with the embodiments with reference to the drawings.

[0026] Figures 1 to 6 The figure shows a schematic diagram of this embodiment. The self-priming pump with more stable flow detection in this embodiment mainly includes a pump housing 1, a flow switch 2, etc.

[0027] Reference Figures 1 to 3 As shown, the pump housing 1 is provided with a water inlet 1a and a water outlet 1b. It is characterized in that: an inlet channel 1c communicating with the water inlet 1a and an outlet channel 1d communicating with the water outlet 1b are formed inside the pump housing 1. A flow switch 2 for detecting the flow rate is provided in the outlet channel 1d. The fluid coming in from the water inlet 1a flows from the inlet channel 1c to the outlet channel 1d, and after passing through the flow switch 2 built in the outlet channel 1d, it flows out from the water outlet 1b. When the fluid passes through, the flow switch 2 can control whether the motor of the self-priming pump starts according to the magnitude of the impact force of the fluid.

[0028] Among them, in order to optimize the internal structure of the pump housing 1 so that the inlet channel 1c and the outlet channel 1d can be better formed inside the pump housing 1, reference Figure 3 As shown, in this embodiment, an arc-shaped first partition 1e is provided inside the pump housing 1. The first partition 1e divides the inside of the pump housing 1 into an inlet channel 1c and an outlet channel 1d. The pump impeller 4 for driving the fluid flow is located between the inlet channel 1c and the outlet channel 1d, so that the inlet channel 1c and the outlet channel 1d are communicated with each other.

[0029] Secondly, in order to optimize the overall structure of the flow switch 2 so that the flow switch 2 can better detect the fluid, and at the same time in order for the flow switch 2 to better discharge sewage externally, reference Figures 4 to 6As shown, in this embodiment, the flow switch 2 includes a housing 2a, a top cover 2b and a head 2c. An upper and lower open water passing cavity 2a1 is formed inside the housing 2a. A water outlet hole 2a2 communicating with the water passing cavity 2a1 is provided on the side of the housing 2a. The top cover 2b is detachably arranged at the top opening of the housing 2a. The head 2c is placed inside the water passing cavity 2a1 and can move up and down relative to the housing 2a within a set range. A sensing post 2b1 extending downward is provided at the bottom of the top cover 2b. A reed switch 2b2 is built in the sensing post 2b1. The head 2c is formed with a vertically communicating sensing cavity 2c1 for the sensing post 2b1 to move up and down. The bottom opening of the sensing cavity 2c1 forms a water inlet hole 2c2 for fluid to enter the flow switch 2. A magnet 2c3 adapted to the reed switch 2b2 is also provided in the sensing cavity 2c1. The head 2c can move upward under the impact of water flow. During the upward movement of the head 2c, the start or stop of the motor of the self-priming pump can be controlled by the change in the relative position between the reed switch 2b2 and the magnet 2c3. A spring 2d that can always drive the head 2c to move downward is provided between the head 2c and the top cover 2b. A dirt discharge channel 2e for water flow and dirt to pass through is also formed between the sensing cavity 2c1 and the sensing post 2b1.

[0030] Also, in order to better set the flow switch 2 in the water outlet channel 1d, refer to Figure 3 As shown, a second partition 1f is provided in the water outlet channel 1d in this embodiment. The second partition 1f divides the water outlet channel 1d into a first chamber 1d1 and a second chamber 1d2. The first chamber 1d1 communicates with the water inlet channel 1c, and the second chamber 1d2 communicates with the water outlet 1b. A first mounting hole 1g for installing the top cover 2b is opened on the pump housing 1. A second mounting hole 1f1 for installing the housing 2a is provided on the second partition 1f. When the flow switch 2 is in the installed state, the water inlet hole 2c2 is located in the first chamber 1d1, and the water outlet hole 2a2 is located in the second chamber 1d2.

[0031] At the same time, in order to better fix the flow switch 2 on the pump housing 1, refer to Figure 2 As shown, in this embodiment, an installation platform 2b3 exposed outside the pump housing 1 is provided at the top of the top cover 2b. A third mounting hole 2b4 for installing the flow switch 2 to the pump housing 1 with a fastener A is provided through the installation platform 2b3. A sealing ring 2b5 for sealing the pump housing 1 and the top cover 2b is also sleeved on the top cover 2b.

[0032] In this embodiment, in order to better control the start or stop of the motor by the flow switch, refer to Figure 5 and Figure 6 As shown, a control box 2b6 is also provided on the upper part of the installation platform 2b3. A controller 2b7 electrically connected to the reed switch 2b2 is built in the control box 2b6.

[0033] In this embodiment, in order to better form a descaling channel 2e inside the flow switch for impurities and dirt to pass through, the cross-section of the induction cavity 2c1 is circular, the magnet 2c3 is in a ring shape and is embedded on the inner wall of the induction cavity 2c1, the induction column 2b1 is cylindrical to facilitate passing through the induction cavity 2c1 and the magnet 2c3, and the gap between the inner peripheral surface of the induction cavity 2c1 and the outer peripheral surface of the induction column 2b1 forms the descaling channel 2e, and the inner peripheral surface of the magnet 2c3 and the inner peripheral surface of the induction cavity 2c1 are flush.

[0034] Reference Figure 5 and Figure 6 As shown in the reference and, in this embodiment, in order to better achieve a detachable connection between the top cover 2 and the housing 1, a limiting boss 2a3 is provided on the inner peripheral wall at the bottom opening of the housing 2a, a limiting flange 2c4 adapted to the limiting boss 2a3 is formed on the outer peripheral surface of the end cover 2c. In the state where the end cover 2c moves downward to a set position, the limiting flange 2c4 can abut against the limiting boss 2a3 to limit the end cover 2c from continuing to move downward. A plurality of guide bars 2c5 are arranged vertically on the outer peripheral surface of the end cover 2c, and a guide groove 2a4 for restricting the guide bars 2c5 to move only up and down is formed on the inner peripheral wall at the bottom opening of the housing 2a.

[0035] Reference Figure 5 As shown in the reference and, in this embodiment, a detachable structure 5 is provided between the housing 2a and the top cover 2b. The detachable structure 5 includes a clamping groove 5a provided on the housing 2a and a clamping block 5b provided on the top cover 2b. The detachable connection between the housing 2a and the top cover 2b is realized through the mutual adaptation of the clamping groove 5a and the clamping block 5b. The clamping groove 5a includes a locking groove 5a1 and a detaching groove 5a2. The top of the detaching groove 5a2 extends to the edge of the top opening of the housing 2a. The locking groove 5a1 extends circumferentially along the housing 2a and communicates with the bottom of the detaching groove 5a2. An annular wall 2b8 that can extend into the water passing cavity 2a1 extends downward from the bottom of the top cover 2b. The clamping block 5b is provided on the outer peripheral surface of the annular wall 2b8. In the state where the clamping block 5b is inserted into the detaching groove 5a2 from top to bottom, by rotating the top cover 2b, the clamping block 5b can be circumferentially clamped into or disengaged from the locking groove 5a1, so as to realize the detachable connection between the housing 2a and the top cover 2b.

[0036] In this embodiment, an inlet 1a and an outlet 1b are provided on the pump housing 1, an inlet passage 1c communicating with the inlet 1a and an outlet passage 1d communicating with the outlet 1b are provided inside the pump housing 1, and a flow switch 2 for detecting the fluid is provided in the outlet passage 1d. When the fluid from the inlet 1d flows from the inlet passage 1c to the outlet passage 1d, the fluid will flow to the flow switch 2 built in the outlet passage 1d and finally flow out from the outlet 1b of the pump housing 1. The flow switch 2 can control the start or stop of the motor of the self-priming pump according to the magnitude of the fluid impact force when the fluid passes through. Since the flow switch 2 is arranged in the outlet passage 1d and is in the downstream position of the impeller 4, the fluid impact force formed by the impeller 4 in the outlet passage 1d is always in a positive pressure state, and the fluid impact force generated in the outlet passage 1d is much greater than the fluid impact force in the inlet passage 1c. Therefore, the impurities or dirt passing through or accumulating inside the flow switch 2 can be quickly washed away. This avoids the drawback in the prior art that it is difficult to wash out the impurities or dirt from the flow switch due to insufficient suction force generated by negative pressure. Also refer to Figure 3 and Figure 6 As shown, when the flow switch 2 is installed on the pump housing 1, the head 2c will move upward under the impact of the water flow, causing the relative position between the reed 2b2 and the magnet 2c3 to change. Until the magnet 2c3 does not sense the reed 2b2 (at this time, the offset between the magnet 2c3 and the reed 2b2 exceeds a certain distance), the reed 2b2 no longer controls the motor to work, and at this time, the fluid volume flowing into the pump housing 1 will continue to increase; when the fluid flow rate decreases, the entire head 2c will move downward under the rebound action of the spring 2d, and the spring 2d will undergo elongation and recovery deformation. At this time, the magnet 2c3 will sense the reed 2b2, and the reed 2b2 will control the motor to always be in the starting state, so that the flow switch can smoothly control the start or stop of the motor to achieve the flow control of the water pump. Since a dirt discharge passage 2e for allowing the water flow and dirt to pass through is formed between the sensing cavity 2c1 and the sensing post 2b1 here, the impurities or dirt passing through the flow switch 2 can be quickly discharged through the dirt discharge passage 2e and cannot accumulate, making the flow detection of the self-priming pump more stable and reliable.

[0037] It should be noted that in the description of this embodiment, the orientation or positional relationship indicated by terms such as "front, back", "left, right", "inner, outer", "upper, lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. The terms "installed", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A self-priming pump with more stable flow detection, comprising a pump housing (1), wherein the pump housing (1) is provided with a water inlet (1a) and a water outlet (1b), characterized in that: The pump housing (1) is provided with a water inlet channel (1c) connected to the water inlet (1a) and a water outlet channel (1d) connected to the water outlet (1b); a flow switch (2) for detecting flow rate is provided in the water outlet channel (1d); the fluid entering from the water inlet (1a) flows from the water inlet channel (1c) to the water outlet channel (1d), and flows out from the water outlet (1b) after passing through the flow switch (2) built into the water outlet channel (1d); the flow switch (2) can control whether the motor of the self-priming pump is started or not according to the magnitude of the impulse of the fluid when the fluid passes through; The flow switch (2) comprises a shell (2a), a top cover (2b) and a sealing head (2c); a water passage cavity (2a1) with upper and lower openings is formed inside the shell (2a); a water outlet hole (2a2) connected to the water passage cavity (2a1) is provided on the side of the shell (2a); the top cover (2b) is detachably arranged at the top opening of the shell (2a); the sealing head (2c) is built into the water passage cavity (2a1) and can move up and down relative to the shell (2a) within a set range; a sensing column (2b1) extending downward is provided at the bottom of the top cover (2b); a reed sheet (2b2) ​​is built into the sensing column (2b1); and a sensing cavity is formed vertically on the sealing head (2c) which is connected up and down and can allow the sensing column (2b1) to move up and down. (2c1), the bottom opening of the sensing chamber (2c1) forms a water inlet (2c2) for allowing fluid to enter the flow switch (2), the sensing chamber (2c1) is also provided with a magnet (2c3) that can be adapted to the reed sheet (2b2), the sealing head (2c) can move upward under the impact of water flow, and the sealing head (2c) can control whether the motor of the self-priming pump is started or not by changing the relative position of the reed sheet (2b2) ​​and the magnet (2c3) during the upward movement, a spring (2d) that can drive the sealing head (2c) to always move downward is provided between the sealing head (2c) and the top cover (2b), and a dirt discharge channel (2e) for allowing water flow and dirt to pass through is also formed between the sensing chamber (2c1) and the sensing column (2b1).

2. The self-priming pump with more stable flow detection according to claim 1, characterized in that: A first arc-shaped partition (1e) is provided inside the pump housing (1), and the first partition (1e) divides the interior of the pump housing (1) into the aforementioned water inlet channel (1c) and water outlet channel (1d). A pump wheel (4) for driving the flow of fluid is located between the water inlet channel (1c) and the water outlet channel (1d), so that the water inlet channel (1c) and the water outlet channel (1d) are connected to each other.

3. The self-priming pump with more stable flow detection according to claim 2 is characterized in that: A second partition (1f) is provided in the water outlet channel (1d), and the second partition (1f) divides the water outlet channel (1d) into a first chamber (1d1) and a second chamber (1d2); the first chamber (1d1) is connected to the water inlet channel (1c), and the second chamber (1d2) is connected to the water outlet (1b); a first mounting hole (1g) for mounting a top cover (2b) is provided on the pump housing (1); a second mounting hole (1f1) for mounting the housing (2a) is provided on the second partition (1f); when the flow switch (2) is in a mounted state, the water inlet hole (2c2) is located in the first chamber (1d1), and the water outlet hole (2a2) is located in the second chamber (1d2).

4. The self-priming pump with more stable flow detection according to claim 1, characterized in that: The top of the top cover (2b) is provided with a mounting platform (2b3) exposed from the pump casing (1), and the mounting platform (2b3) is penetrated by a third mounting hole (2b4) for a fastener (A) to mount the flow switch (2) on the pump casing (1), and the top cover (2b) is also sleeved with a sealing ring (2b5) for sealing the pump casing (1) and the top cover (2b).

5. The self-priming pump with more stable flow detection according to claim 4 is characterized in that: A control box (2b6) is also provided on the upper part of the installation platform (2b3), and the control box (2b6) has a built-in controller (2b7) electrically connected to the reed sheet (2b2).

6. The self-priming pump with more stable flow detection according to claim 1, characterized in that: The cross section of the induction chamber (2c1) is circular, the magnet (2c3) is in the form of a ring and is embedded in the inner wall of the induction chamber (2c1), the induction column (2b1) is in the form of a cylinder so as to be conveniently inserted into the induction chamber (2c1) and the magnet (2c3), and the gap between the inner circumference of the induction chamber (2c1) and the outer circumference of the induction column (2b1) forms the dirt removal channel (2e).

7. The self-priming pump with more stable flow detection according to claim 6, characterized in that: The inner circumference of the magnet (2c3) and the inner circumference of the induction cavity (2c1) are arranged flush.

8. The self-priming pump with more stable flow detection according to claim 1, characterized in that: A limiting boss (2a3) is provided on the inner peripheral wall at the bottom opening of the shell (2a), and a limiting flange (2c4) adapted to the limiting boss (2a3) is formed on the outer peripheral surface of the head (2c). When the head (2c) moves downward to a set position, the limiting flange (2c4) can abut against the limiting boss (2a3) to limit the head (2c) from continuing to move downward. A plurality of guide strips (2c5) are vertically provided on the outer peripheral surface of the head (2c), and a guide groove (2a4) for constraining the guide strip (2c5) to move only up and down is formed on the inner peripheral wall at the bottom opening of the shell (2a).

9. The self-priming pump with more stable flow detection according to claim 1, characterized in that: A detachable structure (5) is provided between the shell (2a) and the top cover (2b), the detachable structure (5) comprising a snap-fitting groove (5a) provided on the shell (2a) and a clamping block (5b) provided on the top cover (2b), and a detachable connection between the shell (2a) and the top cover (2b) is achieved by mutual adaptation of the snap-fitting groove (5a) and the clamping block (5b), the snap-fitting groove (5a) comprising a locking groove (5a1) and a detachable groove (5a2), the top of the detachable groove (5a2) extending to the top opening edge of the shell (2a), the locking groove (5a1) extending around the top opening edge of the shell (2a), and the locking groove (5a1) extending around the top opening edge of the shell (2a). The bottom of the top cover (2b) extends downwardly to form an annular wall (2b8) which can extend into the water passage chamber (2a1), and extends circumferentially along the shell (2a) and communicates with the bottom of the disassembly groove (5a2). The clamping block (5b) is arranged on the outer circumferential surface of the annular wall (2b8). When the clamping block (5b) is inserted into the disassembly groove (5a2) from top to bottom, the top cover (2b) can be rotated to make the clamping block (5b) circumferentially engage in the locking groove (5a1) or disengage from the locking groove (5a1), thereby realizing a detachable connection between the shell (2a) and the top cover (2b).

Images