CN220929688U - Breathing self-priming pump - Google Patents

Abstract

The utility model belongs to the technical field of water pumps, in particular to a respiratory self-priming pump, which comprises: the pump shell is internally provided with a pump cavity; the motor is arranged on one side of the pump shell and is driven by rotation to form an impeller; the liquid inlet pipe is arranged in the pump shell, one end of the liquid inlet pipe is provided with a medium inlet, and the other end of the liquid inlet pipe is communicated with the liquid inlet end of the impeller and is used for enabling a fluid medium to enter the impeller through the liquid inlet pipe; the return pipe is connected to the lower side of the liquid inlet pipe, and a switch piece is movably arranged in the return pipe; the switch piece has an open state and a closed state, and a reset piece is arranged on the switch piece. The self-priming is realized through the back flow action of the back flow pipe in the patent, because the back flow pipe is wholly positioned below the liquid inlet pipe, the whole length of the back flow pipe is reduced, thereby reducing the length of the self-priming pump shell, reducing the whole length of the self-priming pump and effectively reducing the volume of the product under the premise of ensuring the lift.

Description

Breathing self-priming pump

Technical Field

The utility model belongs to the technical field of water pumps, and particularly relates to a respiratory self-priming pump.

Background

The existing water pump is provided with the injection pipe for realizing water-vapor separation to generate self-suction force, so that the overall length of the water pump is longer, and if a water flow switch is arranged at the inlet of the water pump, the overall size of the water pump is larger, and the actual transportation and installation and use are affected, for example, the injection pump disclosed in China patent 2017111044596 comprises a motor, a connecting seat, a pump body and an impeller arranged in the pump body. For manufacturers, the volume of the water pump is reduced as much as possible, and the performance of the water pump is not influenced, so that the manufacturers always need to overcome the problem.

Disclosure of Invention

The utility model aims to provide a respiratory self-priming pump capable of effectively reducing the volume of a product.

The purpose of the utility model is realized in the following way:

a respiratory self-priming pump, comprising:

the pump shell is internally provided with a pump cavity;

the motor is arranged on one side of the pump shell and is driven by rotation to form an impeller;

the liquid inlet pipe is arranged in the pump shell, one end of the liquid inlet pipe is provided with a medium inlet, and the other end of the liquid inlet pipe is communicated with the liquid inlet end of the impeller and is used for enabling a fluid medium to enter the impeller through the liquid inlet pipe; and

The return pipe is connected to the lower side of the liquid inlet pipe, and a switch piece is movably arranged in the return pipe; the switch piece has an open state and a closed state, and is provided with a reset piece, so that the switch piece is in the open state through the reset piece, or the switch piece is in the closed state through overcoming the reset piece under the action of the pressure difference between the inside and the outside of the liquid inlet pipe.

Further, a first abutting boss is arranged on the switch piece in a surrounding mode, and a second abutting boss axially opposite to the first abutting boss is arranged on the inner wall of the return pipe; the first abutting boss is further provided with a sealing ring, when the switch piece is in a closed state, the first abutting boss, the sealing ring and the second abutting boss are abutted against in sequence to seal the return pipe, and the reset piece drives the first abutting boss and the second abutting boss to be far away from each other to enable the return pipe to be conducted, so that the switch piece is in an open state.

Further, the two ends of the switch piece are respectively provided with an upper limit hook and a lower limit hook, and the two ends of the return pipe are respectively provided with an upper abutting surface and a lower abutting surface which are respectively used for abutting against the upper limit hook and the lower limit hook, and the return pipe is used for limiting the maximum downward movement distance of the switch piece through the upper limit hook and the upper abutting surface or limiting the maximum upward movement distance of the switch piece through the lower limit hook and the lower abutting surface.

Further, a guide chute is arranged on the inner wall of the lower end of the return pipe, the lower limit clamping hook is positioned in the guide chute, and the upper end of the guide chute is provided with the lower abutting surface.

Further, the guide sliding grooves are arranged in a plurality and are circumferentially arranged on the inner wall of the lower end of the return pipe; the lower limit hooks are provided with a plurality of guide sliding grooves and correspond to the guide sliding grooves respectively.

Further, the upper end of the switch piece is provided with at least two elastic strip parts, and the end parts of the elastic strip parts are provided with the upper limit hooks.

Further, a drainage cover is further arranged in the liquid inlet pipe, the drainage cover is arranged at one end of the return pipe connected with the liquid inlet pipe, and an opening of the drainage cover faces the impeller.

Further, the motor is provided with a housing, the motor comprises a stator arranged on the housing and a rotor connected with the impeller, and an isolation cover for isolating the rotor from the stator is arranged outside the rotor.

Further, the pump shell comprises a water inlet pump shell and a self-priming pump shell which are connected end to end in sequence, and the liquid inlet pipe is arranged in the self-priming pump shell; the self-priming pump is characterized in that a medium flow channel is formed in the water inlet pump shell, the head end and the tail end of the medium flow channel are respectively connected with the outside and a medium inlet of a liquid inlet pipe, and a water outlet is formed in the self-priming pump shell; the water inlet pump shell is also provided with a mounting seat, and the mounting seat is provided with a water flow switch arranged in the medium flow channel.

Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

The self-priming is realized through the back flow action of the back flow pipe in the patent, because the back flow pipe is wholly positioned below the liquid inlet pipe, the whole length of the back flow pipe is reduced, thereby reducing the length of the self-priming pump shell, reducing the whole length of the self-priming pump and effectively reducing the volume of the product under the premise of ensuring the lift.

The switch spare in this patent is through first support boss, sealing ring and the second support the boss and offset in proper order and block up the back flow, when the pressure in the pump case changes, the switch spare of lift fortune can make the displacement in time by virtue of pressure difference, come the water yield size of accessible, in time compensate from the suction for the water pump is in best operating condition always.

This patent is through will intake the pump case setting is in one side of inhaling the pump case to with the mount pad integration of water flow switch intake the pump case, under the prerequisite that self-priming pump case volume reduces, reduce the pump case height that is equipped with water flow switch, thereby holistic reduction pump case's volume.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic cross-sectional view of fig. 1.

Fig. 3 is a schematic view of a structure in which the motor is mounted with a return cover.

Fig. 4 is an exploded view of fig. 3.

Fig. 5 is a schematic view of the installation of the cowling.

Fig. 6 is a schematic cut-away view of the fairing.

Fig. 7 is a schematic view of the structure of the cowling in fig. 5.

FIG. 8 is a schematic cross-sectional view of a fairing

Fig. 9 is a schematic view of the structure of the inlet pump housing.

The meaning indicated by the reference numerals in the figures:

1. A pump housing; 11. a pump chamber; 12. a water inlet pump shell; 121. a media flow path; 1211. a first flow path portion; 1212. a second flow path portion; 122. a first clamping seat; 123. a mounting base; 124. a flow channel inlet; 125. a flow channel outlet; 126. a pre-water pipe; 127. a drain pipe; 13. self-priming pump shell; 131. a water outlet;

2. a liquid inlet pipe; 21. a medium inlet; 22. a medium outlet;

3. a motor; 31. an impeller; 32. a guide vane body; 321. a first fluid port; 322. second rectifying partition leaves; 33. a housing; 34. a rotor; 35. a stator; 36. an isolation cover;

4. A reflow cover; 41. a second fluid port; 42. a third fluid port; 43. a return port; 44. a second clamping seat;

5. A fairing; 51. a first rectifying partition; 52. a rectifying outlet; 53. a partition plate;

6. A return pipe; 61. a switch member; 611. a first abutment boss; 612. a second abutment boss; 613. a seal ring; 614. an upper limit clamping hook; 615. a lower limit hook; 616. a spring strip part; 617. a main body; 62. a reset member; 63. an upper abutment surface; 64. a lower abutment surface; 65. a guide chute; 66. a drainage cover;

Detailed Description

The utility model is further described with reference to the following specific examples:

The respiratory self-priming pump comprises a pump shell 1, a motor 3 and a liquid inlet pipe 2, wherein a pump cavity 11 is arranged in the pump shell 1, the motor 3 is arranged on one side of the pump shell 1, an impeller 31 is driven by rotation of the motor 3, the liquid inlet pipe 2 is arranged in the pump shell 1, one end of the liquid inlet pipe 2 is provided with a medium inlet 21, the other end of the liquid inlet pipe 2 is provided with a medium outlet 22, and the medium outlet 22 is communicated with the impeller 31; the liquid inlet pipe 2 is used for enabling the fluid medium to enter the liquid inlet pipe 2 from the medium inlet 21, flow to the impeller 31 and flow back to the pump cavity 11.

Specifically, as shown in fig. 3 and 4, the impeller 31 is covered with a guide vane body 32 connected with the medium outlet 22, the guide vane body 32 is circular, and a through hole connected with the medium outlet 22 is arranged in the center of the guide vane body 32. The impeller 31 in the patent is a closed centrifugal impeller, an impeller 31 inlet facing the medium outlet 22 is arranged at the center of the impeller 31, spiral separation blades are arranged in the impeller 31, and an impeller 31 outlet is arranged at the outer edge of the impeller 31; the outer edge of the guide vane body 32 is also provided with spiral partition leaves, and a first flow passage 321 is formed between each spiral partition leaf; the fluid medium enters the liquid inlet pipe 2 from the medium inlet 21, then sequentially enters the guide vane body 32 and the impeller 31 through the medium outlet 22, is thrown outwards through the rotation of the impeller 31, and sequentially passes through the impeller 31 outlet and the first fluid port 321 of the impeller 31 to enter the pump cavity 11 of the pump shell 1.

As shown in fig. 1 and 2, in practice, the pump casing 1 in this patent is composed of two parts, and includes a water inlet pump casing 12 and a self-priming pump casing 13, the self-priming pump casing 13 is cylindrical, a medium flow channel 121 is formed in the water inlet pump casing 12, and a flow channel inlet 124 and a flow channel outlet 125 are respectively provided at the first end and the second end of the medium flow channel 121, and are respectively used for being connected with external fluid and the medium inlet 21 of the liquid inlet pipe 2; the self-priming pump shell 13 is provided with a water outlet 131; the liquid inlet pipe 2 is arranged in the self-priming pump shell 13, and when the water inlet pump shell 12 is connected with the self-priming pump shell 13, the medium inlet 21 of the liquid inlet pipe 2 is communicated with the flow channel outlet 125 of the medium flow channel 121. When the self-priming pump works, the self-priming pump generates self-suction force to suck water, and the water flow enters from the flow channel inlet 124 of the water inlet pump shell 12 and passes through the medium flow channel 121, then sequentially passes through the liquid inlet pipe 2, the impeller 31 and the guide vane body 32, flows back to the self-priming pump shell 13 through the first flow channel 321 on the guide vane body 32, and is sent out from the water outlet 131 of the self-priming pump shell 13.

The liquid inlet pipe 2 is provided with a return pipe 6 for generating self-suction force by the self-suction pump in the patent, as shown in fig. 5-8, the return pipe 6 is arranged in the self-suction pump shell 13, the return pipe 6 is connected to the lower side of the liquid inlet pipe 2, a switch piece 61 is movably arranged in the return pipe 6, the switch piece 61 has an open state and a closed state, the switch piece 61 is provided with a reset piece 62, the switch piece 61 is made to enter the open state through the reset piece 62, or the switch piece 61 is made to enter the closed state by overcoming the reset piece 62 under the action of pressure difference between the inside and the outside of the liquid inlet pipe 2.

As shown in fig. 5 and 6, the return pipe 6 is vertically connected to the lower end of the liquid inlet pipe 2, and the two are connected to form a T-shaped pipe, the switch element 61 is specifically a plastic element, two ends of the switch element 61 are respectively provided with an upper limit hook 614 and a lower limit hook 615, two ends of the return pipe 6 are respectively provided with an upper abutting surface 63 and a lower abutting surface 64 which are respectively used for abutting against the upper limit hook 614 and the lower limit hook 615, and the maximum downward movement distance of the switch element 61 is limited by making the upper limit hook 614 and the upper abutting surface 63, or the maximum upward movement distance of the switch element 61 is limited by making the lower limit hook 615 and the lower abutting surface 64, so that the switch element 61 can move in the return pipe 6 and cannot be separated outwards.

As shown in fig. 7, a first abutment boss 611 is annularly disposed on the switch element 61, a backflow gap is disposed between the first abutment boss 611 and the backflow pipe 6, a second abutment boss 612 axially opposite to the first abutment boss 611 is disposed on an inner wall of the backflow pipe 6, a sealing ring 613 is further disposed on the first abutment boss 611, when the switch element 61 is in a closed state, the first abutment boss 611, the sealing ring 613 and the second abutment boss 612 abut against each other in sequence to seal the backflow pipe 6, and the return element 62 drives the first abutment boss 611 and the second abutment boss 612 to be far away from each other to conduct the backflow pipe 6, so that the switch element 61 is in an open state.

Referring specifically to fig. 7 and 8, the switch element 61 in this patent includes a main body 617 located in the middle of the switch element 61, the upper end of the main body 617 is connected with a plurality of elastic strip portions 616, at least two elastic strip portions 616 are provided, the end of each elastic strip portion 616 is provided with an upper limit hook 614, in this embodiment, the upper abutting surface 63 is located at one end of the return pipe 6 connected with the liquid inlet pipe 2, the elastic strip portions 616 penetrate through the return pipe 6 and enable the upper limit hooks 614 to be located outside the liquid inlet pipe 2, and when the switch element 61 moves downwards through elasticity of the elastic strip portions 616, the upper limit hooks 614 are enabled to be barbed on the outer edge of the end of the liquid inlet pipe 2, so as to realize limiting. The lower end of the main body 617 is connected with a first abutting boss 611, and the cross-sectional area of the first abutting boss 611 is larger than that of the main body 617; correspondingly, the second abutment boss 612 is integrally formed on the inner wall of the return tube 6; the sealing ring 613 is a sealing rubber ring set outside the main body 617 and located on the first abutting boss 611, when the switch piece 61 moves upwards, the switch piece 61 enters a closed state, and the first abutting boss 611, the sealing ring 613 and the second abutting boss 612 abut against each other in order to seal the return pipe 6; the restoring member 62 is a spring sleeved outside the main body 617 and the elastic strip portion 616, the upper end of the spring abuts against the upper end of the return pipe 6, the lower end of the spring abuts against the first abutting boss 611, so as to elastically drive the switching member 61 to move downwards, and when the switching member 61 moves downwards, the first abutting boss 611, the sealing ring 613 and the second abutting boss 612 are separated, a gap is generated between the first abutting boss 611 and the second abutting boss 612, and a gap is also formed between the elastic strip portion 616, so that the switching member 61 is in an open state.

As shown in fig. 9, the water inlet pump housing 12 is further provided with a pre-filling pipe 126 and a draining pipe 127, the pre-filling pipe 126 is vertically disposed above the water inlet pump housing 12 and is communicated with the medium flow passage 121, a user can manually add fluid through the pre-filling pipe 126, the draining pipe 127 is disposed below the stop flow passage and is directly connected with the bottom pump cavity 11 of the self-priming pump housing 13, and when the self-priming pump is not in use, the draining pipe 127 is opened to drain redundant fluid medium.

Taking water absorption as an example, the self-priming pump in this patent is used as follows:

Firstly, before the self-priming pump shell 13 is used, no water exists in the self-priming pump shell 13, some water can be added into the self-priming pump shell 13 through the pre-adding water pipe 126, and the water quantity in the self-priming pump shell 13 can overflow the return pipe 6 and the liquid inlet pipe 2; the drain pipe 127 is in a closed state, preventing water from flowing out.

Then, the impeller 31 operates. When the impeller 31 is started, most of the gas is remained in the self-priming pump shell 13, so that the pressure cannot be formed in the self-priming pump shell 13, the switch piece 61 is in an open state under the action of the reset piece 62, and at the moment, the rotation can suck the liquid at the bottom of the self-priming pump shell 13 through the return pipe 6 and send the liquid to the impeller 31 for water-steam separation, so that self-suction force is generated for water suction. If the external water is sufficient, and the water inflow of the self-priming pump is sufficient, the water inlet pump casing 12, the liquid inlet pipe 2 and the self-priming pump casing 13 are all provided with water, the impeller 31 rotates to normally spray water outwards through the water outlet 131 on the self-priming pump casing 13, pressure is formed in the pump body, the switch piece 61 overcomes the reset piece 62 to move upwards through the pressure, and the first abutting boss 611, the sealing ring 613 and the second abutting boss 612 are abutted in sequence to seal the return pipe 6; if the external water quantity is reduced, the water inlet quantity of the self-priming pump is reduced, the air inlet quantity is increased, at the moment, the gas in the pump body is increased, the pressure of the pump body is reduced, the switch piece 61 is gradually opened under the action of the reset piece 62, and the self-suction force is ensured by supplementing water from the bottom of the self-priming pump shell 13. If the external water quantity becomes smaller, and the self-priming pump can not always suck water, the water quantity is insufficient, so that the water in the self-priming pump shell 13 can not be discharged outwards through the water outlet 131, and at the moment, the water in the self-priming pump shell 13 realizes internal circulation through the return pipe 6, thereby ensuring the self-priming force of the self-priming pump until the water is pumped.

For the self-priming pump shell 13, self-priming is realized through the reflux action of the reflux pipe 6 in the patent, and the whole length of the reflux pipe 6 is reduced because the whole reflux pipe 6 is positioned below the liquid inlet pipe 2, so that the length of the self-priming pump shell 13 is reduced, the whole length of the self-priming pump is reduced, and the product volume is effectively reduced on the premise of ensuring the lift. Moreover, the switch 61 sequentially abuts against the first abutting boss 611, the sealing ring 613 and the second abutting boss 612 to block the return pipe 6, when the pressure in the pump casing 1 changes, the switch 61 in lifting operation can timely make displacement by virtue of the pressure difference, so that the water quantity can pass through, and the self-suction force can be timely compensated, so that the water pump is always in the optimal working state.

In addition, the switch piece 61 in this patent sets up in the back flow 6 to through last spacing pothook 614 and lower spacing pothook 615, overall structure is simple, and because last spacing pothook 614 passes through bullet strip portion 616 to be fixed, only need pack whole switch piece 61 in during the installation in back flow 6 can realize the installation, the assembly is simple.

Further, a guiding chute 65 is provided on the inner wall of the lower end of the return pipe 6, the lower limit hook 615 is located in the guiding chute 65, and the upper end of the guiding chute 65 is provided with the lower abutment surface 64. As shown in fig. 6, the inner wall of the lower end of the return pipe 6 is provided with a plurality of guide sliding grooves 65 in a ring manner, and the lower limit hooks 615 are provided on the outer edge of the first abutting boss 611 in a ring manner and are inserted into the guide sliding grooves 65; the lower abutment surface 64 is now located inboard of the second abutment boss 612. When the switch key moves, the lower limit hook 615 moves along the guide chute 65, and the switch piece 61 can be guided to slide through the guide chute 65, so that the stability of the movement of the switch piece 61 is increased.

Further, a drainage cover 66 is further disposed in the liquid inlet pipe 2, the drainage cover 66 is disposed on one end of the return pipe 6 connected with the liquid inlet pipe 2, and an opening of the drainage cover 66 faces the impeller 31. As shown in fig. 6, the flow guiding cover 66 is a cover body integrally formed in the liquid inlet pipe 2 and having an L-shaped cross section, and is used for guiding the liquid flowing out from the return pipe 6 and moving the liquid towards the impeller 31, so that the liquid can better flow back, and meanwhile, the flow guiding cover 66 can also guide the water flowing in from the medium inlet 21 and flowing towards the medium outlet 22.

Further, a housing 33 is disposed outside the motor 3, the motor 3 includes a stator 35 disposed on the housing 33, and a rotor 34 connected to the impeller 31, and an insulation cover 36 is disposed outside the rotor 34 to insulate the rotor 34 from the stator 35. As shown in fig. 2, the casing 33 is connected to one side of the self-priming pump casing 13, the stator 35 is disposed on the inner wall of the casing 33, the insulation cover 36 is cylindrical, one end of the insulation cover 36 is connected to the open end of the insulation cover 36, the rotor 34 is installed in the insulation cover 36, and the inner cavity of the insulation cover 36 is communicated with the self-priming pump casing 13. The provision of the insulating cover 36 has the advantages that: the rotor 34 is isolated from the stator 35, the liquid from the pump housing 13 can flow into the isolating cover 36 to cool, and no mechanical sealing element is required to be arranged between the rotor 34 and the impeller 31, so that the space for installing the mechanical sealing element is saved, and the whole volume of the motor 3 is reduced.

Further, the water inlet pump housing 12 is further provided with a mounting seat 123, and the mounting seat 123 is provided with a water flow switch arranged in the medium flow passage 121. As shown in fig. 9, the mounting seat 123 is a mounting opening vertically above the medium flow channel 121, and the inner edge of the mounting opening is provided with a thread, through which the water flow switch can be disposed in the mounting opening. Accordingly, the medium flow channel 121 is divided into two ends by the mounting seat 123, which are respectively a first flow channel portion 1211 communicating with the outside and a second flow channel portion 1212 connected to the liquid inlet pipe 2, and the first flow channel portion 1211 is integrally located below the mounting seat, because the water flow switch needs to be vertically mounted and requires the inlet pipeline of the water pump to be lower than the water flow switch; in the existing water pump, the inlet pipeline of the water pump would be located above the pump casing 1 under normal conditions, and accordingly, the water flow switch and the mounting seat 123 thereof are integrally located above the pump casing 1, thereby increasing the overall height of the water pump and affecting the volume thereof. The water inlet pump shell 12 is arranged on one side of the self-priming pump shell 13, the mounting seat 123 of the water flow switch is integrated on the water inlet pump shell 12, and the height of the pump shell 1 provided with the water flow switch is reduced on the premise of reducing the volume of the self-priming pump shell 13, so that the volume of the pump shell 1 is reduced integrally.

Still be equipped with the radome fairing 5 structure that is arranged in carrying out secondary water and gas separation in this patent, as shown in fig. 3, 4, still including backward flow cover 4 and radome fairing 5, backward flow cover 4 covers and establishes outside the stator body 32, backward flow cover 4's outer edge is equipped with a plurality of intercommunication the second flow channel mouth 41 of pump chamber 11, backward flow cover 4's inboard is equipped with third flow channel mouth 42, radome fairing 5 cover is established outside setting up third flow channel mouth 42, be equipped with a plurality of first rectification separation leaves 51 in the radome fairing 5, radome fairing 5's outer edge is equipped with the intercommunication the rectification export 52 of pump chamber 11.

As shown in fig. 4, the backflow cap 4 is a cap body with a shape close to that of the guide vane body 32, the outer edge of the backflow cap 4 is fixed on the self-priming pump housing 13, the second fluid passage opening 41 is a plurality of square openings formed on the outer ring of the backflow cap 4, a backflow opening 43 for the fluid inlet pipe 2 to pass through is formed in the center of the backflow cap 4, the fluid inlet pipe 2 is arranged in the backflow opening 43 in a penetrating manner and is connected with the guide vane body 32, and the size of the backflow opening 43 is slightly larger than the pipe diameter of the fluid inlet pipe 2, so that the third fluid passage opening 42 is formed between the fluid inlet pipe 2 and the backflow cap 4.

As shown in fig. 5 and 6, the fairing 5 is an annular cover body encircling the outside of the liquid inlet pipe 2, in this embodiment, the fairing 5 and the liquid inlet pipe 2 are integrally formed, a partition 53 connected to the outer edge of the medium inlet 21 of the liquid inlet pipe 2 is arranged on the fairing 5, one end of the fairing 5 is connected to the water inlet pump casing 12, and the other end is connected to the backflow cover 4, so that the partition 53 is blocked on the inner end of the medium flow passage 121, and only the medium inlet 21 of the liquid inlet pipe 2 is connected to the medium flow passage 121. As shown in fig. 3 and 5, the water inlet pump housing 12 is provided with a first clamping seat 122, the surface of the backflow cap 4 is provided with a second clamping seat 44, the fairing 5 is arranged in the self-priming pump housing 13, and two ends of the fairing are respectively clamped with the first clamping seat 122 and the second clamping seat 44 to achieve fixation.

As shown in fig. 6, the first rectifying separation blades 51 are provided with a plurality of rectifying separation blades, are circumferentially arranged on the outer wall of the liquid inlet pipe 2, and are connected with the inner wall of the fairing 5; in this embodiment, three rectifying separation blades are provided, and the three rectifying separation blades are 120 degrees apart and surround the outer wall of the liquid inlet pipe 2, and the other edges of the rectifying separation blades are connected with the inner wall of the fairing 5. The fairing outlet 52 includes a circular aperture provided in the outer annulus of the fairing 5.

During operation, the impeller 31 rotates to absorb water and separate water and gas, the water flow sequentially passes through the first flow port 321 at the outer edge of the guide vane body 32 and enters the backflow hood 4, and due to centrifugal rotation of the impeller 31, part of the water flow is sent into the self-priming pump shell 13 from the second flow port 41 and is sent out through the water outlet 131 of the self-priming pump shell 13, and due to limited water flow passing through the second flow port 41, part of the water flow passes through the flow passage between the backflow hood 4 and the guide vane body 32 and enters the fairing 5 through the third flow port 42, and secondary water and gas separation is performed through the first rectification separation blade 51 in the fairing 5, so that the water and gas mixture can be further separated, the self-suction force is further increased, and the lift of the self-priming pump is increased. Further, as shown in fig. 4, the outer surface of the guide vane body 32 is further provided with a plurality of second rectifying separation blades 322 for separating water from air when the water flows through the flow passage between the backflow cap 4 and the guide vane body 32, so as to further increase the self-suction force.

It should be noted that, because the fairing 5 and the liquid inlet pipe 2 in this patent are integrally formed, the product assembling procedure is reduced, so that the product assembling is facilitated. The return pipe 6 in this patent is also integrally formed in the cowling 5 and is located at the lower end of the inlet pipe 2.

The above embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model in this way, therefore: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (9)

1. A respiratory self-priming pump, comprising:

A pump shell (1), wherein a pump cavity (11) is arranged in the pump shell (1);

A motor (3) arranged on one side of the pump shell (1), wherein the motor (3) is rotationally driven with an impeller (31);

The liquid inlet pipe (2) is arranged in the pump shell (1), one end of the liquid inlet pipe (2) is provided with a medium inlet (21), and the other end of the liquid inlet pipe is communicated with the liquid inlet end of the impeller (31) and is used for enabling a fluid medium to enter the impeller (31) through the liquid inlet pipe (2); and

The return pipe (6) is connected to the lower side of the liquid inlet pipe (2), and a switch piece (61) is movably arranged in the return pipe (6); the switch piece (61) is provided with an opening state and a closing state, the switch piece (61) is provided with a reset piece (62), the switch piece (61) is enabled to be in the opening state through the reset piece (62), or the switch piece (61) is enabled to be in the closing state by overcoming the reset piece (62) under the action of the internal and external pressure difference of the liquid inlet pipe (2).

2. A respiratory self-priming pump as claimed in claim 1, wherein: a first abutting boss (611) is arranged on the switch piece (61) in a surrounding way, and a second abutting boss (612) axially opposite to the first abutting boss (611) is arranged on the inner wall of the return pipe (6); the first abutting boss (611) is further provided with a sealing ring (613), when the switch piece (61) is in a closed state, the first abutting boss (611), the sealing ring (613) and the second abutting boss (612) are abutted against in sequence to seal the return pipe (6), and the reset piece (62) drives the first abutting boss (611) and the second abutting boss (612) to be far away from each other to enable the return pipe (6) to be conducted, so that the switch piece (61) is in an open state.

3. A respiratory self-priming pump as claimed in claim 1, wherein: the two ends of the switch piece (61) are respectively provided with an upper limit clamping hook (614) and a lower limit clamping hook (615), and the two ends of the return pipe (6) are respectively provided with an upper abutting surface (63) and a lower abutting surface (64) which are respectively used for abutting against the upper limit clamping hook (614) and the lower limit clamping hook (615) and are used for limiting the maximum downward movement distance of the switch piece (61) through the upper limit clamping hook (614) and the upper abutting surface (63) or limiting the maximum upward movement distance of the switch piece (61) through the lower limit clamping hook (615) and the lower abutting surface (64).

4. A respiratory self-priming pump as claimed in claim 3, wherein: the lower end inner wall of the return pipe (6) is provided with a guide chute (65), the lower limit clamping hook (615) is positioned in the guide chute (65), and the upper end of the guide chute (65) is provided with the lower abutting surface (64).

5. The respiratory self-priming pump of claim 4, wherein: the guide sliding grooves (65) are arranged in a plurality and are circumferentially arranged on the inner wall of the lower end of the return pipe (6); the lower limit hooks (615) are provided with a plurality of guide sliding grooves (65) which correspond to each other.

6. A respiratory self-priming pump as claimed in claim 3, wherein: at least two elastic strip parts (616) are arranged at the upper end of the switch piece (61), and the upper limit hooks (614) are arranged at the end parts of the elastic strip parts (616).

7. A respiratory self-priming pump as claimed in claim 1, wherein: the liquid inlet pipe (2) is also provided with a drainage cover (66), the drainage cover (66) is covered on one end of the return pipe (6) connected with the liquid inlet pipe (2), and an opening of the drainage cover (66) faces the impeller (31).

8. A respiratory self-priming pump as claimed in claim 1, wherein: the motor (3) is provided with a housing (33) outside, the motor (3) comprises a stator (35) arranged on the housing (33), and a rotor (34) connected with the impeller (31), and an insulating cover (36) for insulating the rotor (34) from the stator (35) is arranged outside the rotor (34).

9. A respiratory self-priming pump as claimed in claim 1, wherein: the pump shell (1) comprises a water inlet pump shell (12) and a self-priming pump shell (13) which are connected end to end in sequence, and the liquid inlet pipe (2) is arranged in the self-priming pump shell (13); a medium flow passage (121) is formed in the water inlet pump shell (12), the head end and the tail end of the medium flow passage (121) are respectively connected with the outside and a medium inlet (21) of the liquid inlet pipe (2), and a water outlet (131) is formed in the self-priming pump shell (13); the water inlet pump shell (12) is also provided with an installation seat (123), and the installation seat (123) is provided with a water flow switch arranged in the medium flow channel (121).