CN210509615U - DC permanent-magnet shielding type booster pump - Google Patents

Abstract

The utility model relates to a direct current permanent magnetism shielding formula booster pump, including the epitheca, the inferior valve, including a motor, an end cap, a controller, and a cover plate, a body, be used for the response body in fluid flow and control motor open and stop the rivers switch module and be used for the response canned motor in the canned motor hydraulic pressure change and control motor start or not the pressure switch module, the inferior valve links to each other with the epitheca lower part, the inlet has, cavity and liquid outlet, the motor includes stator and rotor, be equipped with a plurality of stators of top-down superpose in proper order between epitheca inner wall and the canned motor outer wall, the rotor be located the canned motor in and with the canned motor between have the clearance, the body is. The utility model discloses a cooperation of flow switch subassembly and pressure switch subassembly had both solved when the water pressure was not enough in the pump body, the problem of flow switch subassembly inoperative, had also solved the problem that pressure switch subassembly control motor frequently started and burns futilely.

Description

DC permanent-magnet shielding type booster pump

Technical Field

The utility model relates to a shielded booster pump, concretely relates to direct current permanent magnetism shielded booster pump.

Background

A canned motor pump is a device that is powered by inertial centrifugal force to increase pressure by an impeller rotating at high speed. As shown in the "shielding circulating pump" disclosed in the chinese utility model patent with patent No. ZL201721235744.7 (publication No. CN207634335U), including the plastic package motor, the pump body connected with the plastic package motor, set up the fixed axle in the plastic package motor and arrange in the cover fixed epaxial rotor assembly, set up in rotor assembly outlying stator assembly, isolation the housing of rotor assembly and stator assembly, its characterized in that fixed axle one end is inserted in the mounting hole of housing, the other end is inserted in the mounting hole of the pump body, at least one end of fixed axle and the mounting hole that corresponds form the rotation stopping cooperation through the fastener.

In most types of water pumps, a pressure switch is usually installed at a water outlet of a pump body, the pressure switch is used for sensing hydraulic pressure in a pipeline, when the hydraulic pressure in a pipe body is higher than a set value, a power supply of a motor of the water pump is cut off, the motor stops rotating, and when the hydraulic pressure in the pipeline is lower than the set value, the power supply of the motor is switched on. If under the condition of small water flow, water flows out, the pump is started, but the pressure in the pipeline is increased instantly due to small water flow, the motor is stopped immediately, the small water flow continuously flows out to start the pump, the pump is started in such a circulation mode, if the water source is short of water or the impeller in the water pump is blocked by foreign matters, the flow in the pipeline is not generated, the mechanical seal of the water pump can be damaged or the motor is blocked, rotated and burnt, and the motor can be damaged.

The existing direct current permanent magnet canned motor pump is not provided with a structure capable of preventing the motor from being frequently started and dry-burned.

Or the existing water pump is only provided with a water flow switch, but the water flow switch does not work because the impact force of the water flow on the water flow switch is not large enough under the condition that the water pressure of the tap water for supplying water to the pump is insufficient.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art's current situation, provide a direct current permanent magnetism shielding formula booster pump that can effectively solve the motor and frequently start or dry combustion method.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a DC permanent-magnet shielding type booster pump comprises

An upper shell;

the lower shell is connected with the lower part of the upper shell and is provided with a liquid inlet, a cavity and a liquid outlet, and the liquid inlet is communicated with the liquid outlet through the cavity;

a motor including a stator and a rotor;

the shielding sleeve is positioned in the upper shell, a plurality of stators which are sequentially overlapped from top to bottom are arranged between the inner wall of the upper shell and the outer wall of the shielding sleeve, and the rotor is positioned in the shielding sleeve and has a gap with the shielding sleeve;

it is characterized by also comprising

The pipe body is communicated with the liquid inlet or the liquid outlet of the lower shell;

the water flow switch assembly is arranged in the pipe body and used for sensing the flow of fluid in the pipe body to control the start and stop of the motor;

and the pressure switch assembly is used for sensing the hydraulic pressure change in the shielding pump to control whether the motor is started or not.

The water flow switch assembly may have various structures, and preferably, the water flow switch assembly comprises

The valve core extends along the axial direction of the pipe body and can move axially relative to the pipe body;

the first elastic part acts on the valve core and enables the valve core to keep the trend of closing the liquid inlet or the liquid outlet of the lower shell;

the first switch can control the starting and stopping of the motor along with the movement of the valve core.

The pressure switch assembly may have various structural forms, and preferably, the tube body is disposed at the liquid outlet of the lower case and communicated with the liquid outlet, a receiving portion is radially formed on the circumferential wall of the tube body, the pressure switch assembly is disposed in the inner cavity of the receiving portion, a through hole communicated with the inner cavity of the receiving portion is formed on the tube body, and the pressure switch assembly includes

The diaphragm is provided with an elastic deformation part, the elastic deformation part is opposite to the through hole on the pipe body and is positioned at the downstream of the through hole along the water flow direction, and the elastic deformation part can generate the deformation protruding towards the direction far away from the through hole under the action of the water flow pressure;

a valve rod extending along the axial direction of the accommodating part and capable of moving axially in the accommodating part, wherein one end of the valve rod is always contacted with the elastic deformation part of the diaphragm;

the second elastic piece acts on the valve rod and enables the valve rod to keep the trend of pushing the diaphragm towards the direction of the through hole;

and the second switch can control whether the motor is started or not along with the movement of the valve rod.

Preferably, the first switch comprises a first magnetic part arranged on the valve core and a first trigger switch arranged in the side wall of the pipe body, and the first magnetic part is matched with the first trigger switch to control the start and stop of the motor; the second switch comprises a second magnetic piece arranged on the valve rod and a second trigger switch arranged on the accommodating part, and the second magnetic piece is matched with the second trigger switch to control whether the motor is started or not. The first switch can also be a microswitch or a photoelectric switch and is triggered by the valve core; the second switch may also be a microswitch or a photoelectric switch, triggered by the valve stem.

In order to ensure that only part of the diaphragm can move and deform when being subjected to water flow pressure, a pressure cylinder is arranged in the inner cavity of the accommodating part, the pressure cylinder surrounds the periphery of the valve rod, and the peripheral edge of the diaphragm is pressed between one end of the pressure cylinder and the bottom wall of the accommodating part. Otherwise, the diaphragm is not necessarily reset to the initial position after being integrally moved by the water flow pressure, and the diaphragm cannot be effectively pushed to move when being subjected to the water flow pressure again, so that the valve rod and the second switch cannot be effectively matched or cannot be matched to fail.

In order to guarantee good cooperation between valve rod and the diaphragm, the elastic deformation portion of diaphragm is sunken and is formed the depressed part towards the through-hole of body, the tip of valve rod is arranged in this depressed part to can promote the valve rod and remove when making elastic deformation portion receive rivers pressure deformation, and the valve rod also can promote the diaphragm when reseing, guarantees that the diaphragm resets to initial position.

In order to facilitate the installation of the pressure switch assembly and the water flow switch assembly in the shielding pump, the pipe body is detachably connected with the lower shell, so that the pressure switch assembly and the water flow switch assembly can be connected with the pump body after being assembled in the pipe body, and the pressure switch assembly and the water flow switch assembly are convenient to disassemble and maintain if the pressure switch assembly or the water flow switch assembly breaks down; in order to facilitate the installation of the pressure switch assembly, the accommodating part comprises a branch pipe formed along the radial direction of the pipe body and a cover body covering the branch pipe, the branch pipe and the cover body are matched to form the inner cavity, and the cover body is covered after the pressure switch assembly is assembled on the branch pipe.

In order to facilitate the connection of the shielding sleeve, the upper shell and the lower shell, the shielding sleeve is in a cylindrical shape, the upper shell is in a cylindrical shape with the lower end open, the shielding sleeve extends into the upper shell from the open end of the upper shell, a connecting seat which extends outwards from the periphery of the connecting seat and is positioned between the upper shell and the lower shell is formed at the lower part of the shielding sleeve, and the upper shell and the lower shell are connected with the connecting seat. If the connecting seat is not provided, the shielding sleeve, the upper shell and the lower shell need to be connected in pairs, so that the assembly work is complicated, more connecting structures (such as connecting holes and the like) need to be arranged, and the processing difficulty of parts is increased; after the connecting seat is arranged, the upper shell and the lower shell are installed corresponding to the connecting seat only because the connecting seat and the shielding sleeve are integrally formed, and then the three are connected at one time through the fastening piece, so that the assembling and disassembling steps of the three are simplified.

In order to improve the assembling accuracy of the booster pump, the connecting seat comprises an annular body and at least two first connecting parts formed on the periphery of the annular body along the circumferential direction, each first connecting part is provided with a first connecting hole, the lower end of the upper shell is arranged on the annular body, at least two second connecting parts in one-to-one correspondence with the first connecting parts are formed on the outer circumferential wall of the upper shell along the circumferential direction, each second connecting part is provided with a second connecting hole, at least two third connecting holes in one-to-one correspondence with the first connecting holes are formed on the lower shell along the circumferential direction, and the corresponding first connecting holes, the corresponding second connecting holes and the corresponding third connecting holes are connected through fasteners. So first connecting hole, second connecting hole and third connecting hole all have a plurality ofly, guarantee to assemble firmly between inferior valve, epitheca and the shield cover three, prevent that the three from producing the displacement under the assembled state, influence the normal work of canned motor pump.

In order to further improve the connection firmness of the shielding sleeve, the upper shell and the lower shell, the annular body comprises an extension part which extends outwards along the radial direction of the periphery of the shielding sleeve and an annular ring which extends vertically from the periphery of the extension part, the first connecting part is formed at the periphery of the annular ring, the lower part of the upper shell is abutted against the annular ring, and a first sealing ring is arranged between the upper shell and the annular ring, so that the connection firmness of the shielding sleeve and the upper shell is improved, and impurities are prevented from entering the upper shell and the lower shell due to gaps between the shielding sleeve and the upper; the upper portion of inferior valve offsets with the annular ring and is equipped with the second sealing washer between the two, has improved the firm in connection nature of housing and inferior valve to prevent that the clearance from leading to the medium outflow between the two.

Compared with the prior art, the utility model has the advantages that: the utility model discloses a set up rivers switch module and pressure switch module, when tap opened, certain change took place for the internal water pressure of canned motor pump, and the pressure switch module experiences water pressure change, and signals gives the motor and takes precedence starter motor. After the motor is started, the water flow in the pump body pushes the valve core, the first magnetic part on the valve core triggers the first trigger switch, and after the motor is started, the force of the water flow pushing the valve core continuously exists, so that the first trigger switch is ensured to be always in a conducting state, and the motor is always in a normal running state; when the faucet is closed, the valve core resets, the first trigger switch controls the motor to be closed, and the motor disconnection circuit is stopped. Through the cooperation of the water flow switch assembly and the pressure switch assembly, the problem that the water flow switch assembly does not work when the water pressure in the pump body is insufficient is solved, and the problems of frequent starting and dry burning of a control motor of the pressure switch assembly are also solved.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a further exploded view of FIG. 2;

FIG. 4 is a cross-sectional view of FIG. 1;

FIG. 5 is an enlarged view of FIG. 4 at A;

FIG. 6 is a schematic view of the valve assembly of FIG. 5 with the tube, the flow switch assembly and the pressure switch assembly removed;

FIG. 7 is a schematic view of the partially exploded structure of FIG. 6;

FIG. 8 is a schematic structural view of the upper case of FIG. 7;

fig. 9 is a structural view of the lower case of fig. 7;

fig. 10 is a schematic structural view in another direction of fig. 9.

Fig. 11 is a schematic structural view of the shielding case and the connecting socket in fig. 7;

fig. 12 is a schematic structural view in another direction of fig. 11.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 12, the direct current permanent magnet shielding type booster pump of the preferred embodiment includes a pump body and a pipe body 6, the pump body includes an upper casing 1, a lower casing 2, a shielding sleeve 3, a connecting seat 5, a motor and an impeller, the upper casing 1 and the shielding sleeve 3 are both in a cylindrical shape, the shielding sleeve 3 extends into the upper casing 1 from the lower open end of the upper casing 1, the connecting seat 5 which extends outwards from the periphery of the shielding sleeve 3 and is located between the upper casing 1 and the lower casing 2 is formed on the lower portion of the shielding sleeve, and the upper casing 1 and the lower casing 2 are both connected with the connecting seat 5.

The motor comprises a stator 31 and a rotor 32, wherein a plurality of stators 31 which are sequentially overlapped from top to bottom are arranged between the inner wall of the upper shell 1 and the outer wall of the shielding sleeve 3, and the rotor 32 is positioned in the shielding sleeve 3 and has a gap with the shielding sleeve 3.

As shown in fig. 1 to 5, 9 and 10, the lower shell 2 has a liquid inlet 2a, a cavity 2b and a liquid outlet 2c, the liquid inlet 2a is communicated with the bottom of the cavity 2b, and a flow channel 2d communicated with the liquid outlet 2c is formed in the circumferential wall of the cavity 2b along the circumferential direction. The lower shell 2 is detachably connected with the pipe body 6, the liquid outlet 2c is communicated with the pipe body 6, a water flow switch assembly 7 which can sense the flow of fluid in the pipe body 6 and control the start and stop of a motor of the shield pump is arranged in the pipe body 6, and a pressure switch assembly 8 which can sense the hydraulic pressure change in the pipe body 6 and control the start or stop of the motor of the shield pump is also arranged at the pipe body 6. The pressure switch assembly 8 mainly controls the initial start of the motor of the canned motor pump, and certainly, the pressure switch assembly 8 can realize water leakage protection, pipe explosion protection and the like through programming of the single chip microcomputer, namely, the motor is controlled to stop working under abnormal states of water leakage, pipe explosion and the like; the water flow switch assembly 7 can sense the flow of water in the pipe body 6 to control the start and stop of the motor, the water flow switch assembly 7 not only controls the start of the motor, but also controls the stop of the motor in a normal state, and the normal state refers to an abnormal state without water leakage or pipe explosion and the like.

In this embodiment, the valve core 71 extends along the axial direction of the tube body 6 and can move axially relative to the tube body 6, a central portion 751 and at least two radiation strips 752 which radiate radially outward from the periphery of the central portion 751 and are connected to the inner wall of the tube body 6 are arranged in the tube body 6, two adjacent radiation strips 752 are arranged at intervals along the central portion 751 so that water flows through, a guide hole 753 for guiding the moving track of the valve core 71 is formed in the central portion 751, a first end of the valve core 71 faces the liquid outlet 2c of the lower shell 2, a second end of the valve core 71 is movably inserted into the guide hole 753, and the valve core 71 keeps moving towards the liquid outlet 2c of the lower shell 2 and closing the liquid outlet 2c under the action of the first elastic member 72.

A flange 76 is radially formed on the valve element 71 near the first end thereof, and the first elastic member 72 is a spring, and both ends thereof respectively abut against the flange 76 and the radiation bar 752.

The first switch includes a first magnetic member 73 disposed on the valve element 71 and a first trigger switch 74 disposed in a side wall of the tube body 6, referring to fig. 2, a receiving groove 741 for receiving the first trigger switch 74 is formed in the side wall of the tube body 6, the first magnetic member 73 cooperates with the first trigger switch 74 to control the motor to start and stop, the first magnetic member 73 is a magnet, and the first trigger switch 74 is a reed pipe.

When the first end of the valve element 71 is located in the liquid outlet 2c of the lower shell 2 and closes the liquid outlet 2c, the first magnetic member 73 does not sense the first trigger switch 74, the first trigger switch 74 does not control the motor to work, and when the valve element 71 moves along the flow direction of the water flow under the action of the water flow (i.e., moves towards the liquid outlet 2c far away from the lower shell 2), the first trigger switch 74 controls the motor to be always in the starting state when the first trigger switch 74 senses the first magnetic member 73.

The circumferential wall of the pipe body 6 is formed with a receiving portion 80 along a radial direction, the receiving portion 80 includes a branch pipe 802 formed along the radial direction of the pipe body 6 and a cover 803 covering the branch pipe 802, a part of the cover 803 extends into the branch pipe 802, an inner wall of the branch pipe 802 is in threaded connection with an outer wall of the cover 803, the branch pipe 802 and the cover 803 are matched to form an inner cavity 801 for receiving the pressure switch assembly 8, and the pipe body 6 is provided with a through hole 61 communicated with the inner cavity 801 of the receiving portion 80.

The pressure switch assembly 8 includes a diaphragm 81, a valve rod 82, a second elastic member 83, a pressure cylinder 85, and a second switch, the diaphragm 81 has an elastic deformation portion that is recessed toward the through hole 61 of the pipe body 6 to form a recessed portion 811, the recessed portion 811 is opposed to the through hole 61 on the pipe body 6, the elastic deformation portion is located downstream of the through hole 61 in the water flow direction, and the elastic deformation portion is capable of being deformed to protrude in a direction away from the through hole 61 by the pressure of the water flow from the through hole 61. Of course, the membrane 81 may also be elastic as a whole.

The valve rod 82 extends along the axial direction of the accommodating part 80 and can move axially in the accommodating part 80, a first end of the valve rod 82 is always in contact with the diaphragm 81 and is positioned in the concave part 811 of the diaphragm 81, a second end of the valve rod 82 is slidably inserted in the guide groove 804, the guide groove 804 is opened on the cover body 803, and the axis of the guide groove 804 is parallel to or coincided with the axis of the valve rod 82.

In the water flow direction, the valve rod 82 includes a large diameter portion and a small diameter portion connected in sequence, and the second elastic member 83 is a spring and has two ends respectively abutting against the large diameter portion of the valve rod 82 and the cover 803, so that the valve rod 82 keeps a tendency of pushing the diaphragm 81 toward the through hole 61.

The pressure cylinder 85 is provided in the cavity 801 of the accommodating portion 80, the pressure cylinder 85 is provided around the outer periphery of the valve rod 82, and the pressure cylinder 85 is pressed by the cover 803 so that the outer periphery of the diaphragm 81 is pressed between the pressure cylinder 85 and the bottom wall of the accommodating portion 80.

The second switch includes a second magnetic member and a second trigger switch, referring to fig. 3, the valve rod 82 is provided with an accommodating cavity 821 for accommodating the second magnetic member, the cover 803 is provided with an insertion slot 805 for the second trigger switch to be inserted, and the cover 803 is provided with a wire hole 806 communicated with the inner cavity 801 of the accommodating part 80, so as to facilitate wiring. The second magnetic part is matched with the second trigger switch to control whether the motor is started or not, the second magnetic part is a magnet, and the second trigger switch is a magnetic field intensity detection device.

When the elastic deformation part of the diaphragm 81 is impacted by water flow pressure, the concave part 811 of the diaphragm 81 bulges in the direction away from the through hole 61 of the tube body 6, the bulged diaphragm 81 pushes the valve rod 82 to move in the direction away from the through hole 61, and the second elastic member 83 is compressed; when the elastic deformation portion of the diaphragm 81 is subjected to the water flow pressure, the recess 811 is returned toward the through hole 61, and the valve rod 82 is returned by the second elastic member 83.

In the moving process of the valve rod 82, the magnetic field intensity of the second magnetic part detected by the second trigger switch is changed and is transmitted to the processor of the intelligent sensor of the shield pump through the second trigger switch for processing, so that the processor calculates a water pressure value according to the change of the magnetic field intensity; when the processor judges that the obtained current water pressure value is higher than a preset value, the processor orders to cut off a motor power supply of the canned motor pump so as to stop the motor from rotating; and when the processor judges that the obtained current water pressure value is lower than the preset value, the processor orders to switch on a motor power supply of the canned motor pump so as to start the motor to rotate.

In this embodiment, the second trigger switch is connected to the processor through a wire.

In this embodiment, along the water flow direction, the pipe body 6 is disposed at the downstream of the lower case 2, the water flow switch assembly 7 is located in the pipe body 6, and the accommodating portion 80 for accommodating the pressure switch assembly 8 is formed on the pipe body 6; of course, the pipe body 6 can also be arranged at the upstream of the lower casing 2 and communicated with the liquid inlet 2a of the lower casing 2, at this time, the valve core 71 of the water flow switch assembly 7 can close the liquid inlet 2a of the lower casing, but the pressure switch assembly 8 needs to be always positioned at the downstream of the lower casing 2, and the accommodating part 80 for accommodating the pressure switch assembly 8 cannot be formed on the pipe body 6, and compared with the design mode of the water flow switch assembly 7 and the pressure switch assembly 8 in the embodiment, the design mode is not compact enough, and after the water flow switch assembly 7 and the pressure switch assembly 8 are assembled, the pipe body can not be connected with the lower casing 2 at one time.

The working principle and the process of the canned boost pump of the embodiment are as follows:

when the water tap at the water outlet end of the pipe body 6 is opened, the water pressure in the pipe body 6 changes to a certain extent, the pressure switch assembly 8 senses the change of the water pressure, sends a signal to the motor and starts the motor first.

After the motor is started, the water flow in the pump body pushes the valve core 71, the first magnetic part 73 on the valve core 71 triggers the first trigger switch 74, and after the motor is started, the force of the water flow pushing the valve core 71 exists continuously, so that the first trigger switch 74 is ensured to be always in a conducting state, the motor is always in a normal running state, the frequent starting of the motor is avoided, and meanwhile, the stable output of the water yield is ensured.

As long as under the normal operating condition of the water pump, after the water flow passes through the water flow switch assembly 7, the first magnetic member 73 on the valve core 71 always triggers the first trigger switch 74, the control motor operates normally, and the water flow flows out through the pipe body 6.

When the water faucet is closed, the water pressure in the pump body and the pipe body 6 is balanced, the valve core 71 can reset under the action of the first elastic piece 72 and block the liquid outlet 2c of the lower shell 2, the motor is disconnected from a circuit and stops, and therefore the problem of frequent starting of the motor is thoroughly solved, and the motor is effectively protected; and be in the pressurize state in body 6 this moment, when the tap was opened next time, the water pressure in the body 6 changed, and pressure switch subassembly 8 feels the water pressure change, sends the signal and gives the motor and takes first the start motor.

As shown in fig. 6 to 12, the connection socket 5 includes an annular body 50 and at least two first connection portions 51, the annular body 50 includes an extension portion 52 extending radially outward along the periphery of the shielding sleeve 3 and an annular ring 53 extending vertically from the periphery of the extension portion 52, the plurality of first connection portions 51 are formed at the periphery of the annular ring 53 at intervals along the circumferential direction, each first connection portion 51 is provided with a first connection hole 511, the outer peripheral wall of the upper shell 1 is formed with at least two second connection portions 11 corresponding to the first connection portions 51 one by one along the circumferential direction, each second connection portion 11 is provided with a second connection hole 111, the lower shell 2 is provided with at least two third connection holes 22 corresponding to the first connection holes 511 one by one along the circumferential direction, each first connection hole 511 corresponds to one second connection hole 111 and one third connection hole 22, the correspondingly arranged first connection hole 511, second connection hole 111 and third connection hole 22 are connected by a fastener 512. The fastening member 512 may be a bolt and a nut, and the bolt is inserted into the first connection hole 511, the second connection hole 111, and the third connection hole 22, and then fastened by the nut, so that the shield case 3, the upper case 1, and the lower case 2 are connected. In addition, a positioning block 14 extending downwards is arranged on the top wall of the upper shell 1, and a positioning groove 35 capable of accommodating the positioning block 14 is arranged on the top wall of the shielding sleeve 3.

The lower part of the upper shell 1 is abutted against the annular ring 53, and a first sealing ring A1 is arranged between the lower part of the upper shell and the annular ring. The inner side wall of the annular ring 53 is provided with a first groove 533 extending to the upper end surface of the annular ring 53, the lower part of the upper shell 1 is provided with a first flange 12 extending radially along the outer peripheral wall thereof and a second flange 13 extending vertically along the inner peripheral wall thereof, the second connecting part 11 is formed on the periphery of the first flange 12, the first flange 12 abuts against the upper end surface of the annular ring 53, the second flange 13 abuts against the inner wall of the annular ring 53, and the first flange 12, the second flange 13 and the first groove 533 enclose a first accommodating space a for accommodating the first sealing ring a 1.

In addition, the upper end face of the annular ring 53 is provided with a first limiting block 531 extending upwards, the first flange 12 is provided with a first limiting groove 121 in limiting fit with the first limiting block 531, and the first limiting block 531 and the first limiting groove 121 are matched to prevent the upper shell 1 and the shielding sleeve 3 from generating relative circumferential rotation.

The upper portion of inferior valve 2 offsets and annular ring 53 is equipped with second sealing washer A2 between the two, set up the second recess 534 that extends to the L type of annular ring 53 lower extreme face on the lateral wall of annular ring 53, have the tertiary step that links to each other in proper order from bottom to top on inferior valve 2, the both sides wall of second recess 534 offsets respectively on first order step 24a and third level step 24c to make second recess 534 and second level step 24b enclose synthetic second accommodation space b that is used for holding second sealing washer A2.

In addition, the outer peripheral wall of the annular ring 53 is provided with a second limiting block 532 extending radially outwards, the upper end face of the lower shell 2 is provided with a second limiting groove 23 in limiting fit with the second limiting block 532, the second limiting groove 23 is connected with the third-stage step 24c, and the second limiting block 532 is matched with the second limiting groove 23 to prevent the lower shell 2 and the shielding sleeve 3 from generating relative circumferential rotation.

The shaping has the first erection column 21 that upwards extends in the cavity 2b of inferior valve 2, has seted up first mounting groove 211 on the first erection column 21, and the shaping has downwardly extending's second erection column 33 on the roof of housing 3, has seted up second mounting groove 331 on the second erection column 33, and the both ends of fixed axle 4 are installed respectively in first mounting groove 211 and second mounting groove 331. The fixed shaft 4 is rotatably sleeved with a bearing 91, an impeller shaft 92 and a rotor 32 which are all positioned in the shielding sleeve 3 from inside to outside in sequence, the lower part of the impeller shaft 92 is connected with impeller blades 93, the impeller blades 93 form an impeller, the impeller blades 93 extend into the cavity 2b and surround the periphery of the first mounting column 21, and a space is reserved between each impeller blade 93 and the first mounting column 21.

Claims (10)

1. A DC permanent-magnet shielding type booster pump comprises

An upper case (1);

the lower shell (2) is connected with the lower part of the upper shell (1) and is provided with a liquid inlet (2a), a cavity (2b) and a liquid outlet (2c), and the liquid inlet (2a) is communicated with the liquid outlet (2c) through the cavity (2 b);

a motor including a stator (31) and a rotor (32);

the shielding sleeve (3) is positioned in the upper shell (1), a plurality of stators (31) which are sequentially overlapped from top to bottom are arranged between the inner wall of the upper shell (1) and the outer wall of the shielding sleeve (3), and the rotor (32) is positioned in the shielding sleeve (3) and has a gap with the shielding sleeve (3);

it is characterized by also comprising

A pipe body (6) communicated with the liquid inlet (2a) or the liquid outlet (2c) of the lower shell (2);

the water flow switch assembly (7) is arranged in the pipe body (6) and is used for sensing the flow of fluid in the pipe body (6) to control the start and stop of the motor;

and the pressure switch assembly (8) is used for sensing the hydraulic pressure change in the shielding type booster pump to control whether the motor is started or not.

2. The direct-current permanent magnet shielded booster pump according to claim 1, wherein: the water flow switch assembly (7) comprises

A valve core (71) extending along the axial direction of the pipe body (6) and capable of moving axially relative to the pipe body (6);

a first elastic member (72) acting on the valve core (71) and keeping the valve core (71) in a tendency of closing the liquid inlet (2a) or the liquid outlet (2c) of the lower shell (2);

the first switch can control the start and stop of the motor along with the movement of the valve core (71).

3. The direct-current permanent magnet shielded booster pump according to claim 2, wherein: the first switch comprises a first magnetic part (73) arranged on the valve core (71) and a first trigger switch (74) arranged in the side wall of the pipe body (6), and the first magnetic part (73) is matched with the first trigger switch (74) to control the motor to start and stop.

4. The direct-current permanent magnet shielded booster pump according to claim 1, wherein: the pipe body (6) is arranged at the liquid outlet (2c) of the lower shell (2) and communicated with the liquid outlet (2c), the containing part (80) is formed on the peripheral wall of the pipe body (6) along the radial direction, the pressure switch assembly (8) is arranged in the inner cavity (801) of the containing part (80), the pipe body (6) is provided with a through hole (61) communicated with the inner cavity (801) of the containing part (80), and the pressure switch assembly (8) comprises

A diaphragm (81) having an elastic deformation portion which is located downstream of the through hole (61) and is opposed to the through hole (61) in the pipe body (6) in the water flow direction, and which is capable of deforming so as to protrude in a direction away from the through hole (61) under the pressure of the water flow;

a valve rod (82) which extends in the axial direction of the accommodating part (80) and can move in the axial direction of the accommodating part (80), wherein one end of the valve rod (82) is always in contact with the elastic deformation part of the diaphragm (81);

a second elastic member (83) acting on the valve stem (82) and causing the valve stem (82) to maintain a tendency to push the diaphragm (81) toward the through hole (61);

and a second switch capable of controlling whether the motor is started or not according to the movement of the valve rod (82).

5. The direct-current permanent magnet shielded booster pump according to claim 4, wherein: the second switch comprises a second magnetic piece arranged on the valve rod (82) and a second trigger switch arranged on the accommodating part (80), and the second magnetic piece is matched with the second trigger switch to control whether the motor is started or not.

6. The direct-current permanent magnet shielded booster pump according to claim 4, wherein: a pressure cylinder (85) is arranged in an inner cavity (801) of the accommodating part (80), the pressure cylinder (85) is arranged around the periphery of the valve rod (82), and the periphery of the diaphragm (81) is pressed between the pressure cylinder (85) and the bottom wall of the accommodating part (80).

7. The direct-current permanent magnet shielded booster pump according to claim 4, wherein: the elastic deformation portion of the diaphragm (81) is recessed toward the through hole (61) of the tube body (6) to form a recessed portion (811), and the end portion of the valve rod (82) is placed in the recessed portion (811).

8. The direct-current permanent magnet shielding type booster pump according to any one of claims 1 to 7, wherein: the utility model discloses a shield sleeve, including upper shell (1), shield sleeve (3), upper shell (1) and lower casing (2), shield sleeve (3) are the tube-shape, upper shell (1) is the open tube-shape of lower extreme, shield sleeve (3) stretch into in upper shell (1) from the open end of upper shell (1), just shield sleeve (3) lower part shaping has by its periphery outwards extend and lie in connecting seat (5) between upper shell (1) and lower casing (2), upper shell (1) and lower casing (2) all link to each other with this connecting seat (5).

9. The direct-current permanent magnet shielded booster pump according to claim 8, wherein: the connecting seat (5) comprises an annular body (50) and at least two first connecting parts (51) formed on the periphery of the annular body (50) along the circumferential direction, each first connecting part (51) is provided with a first connecting hole (511), the lower end of the upper shell (1) is arranged on the annular body (50), the outer circumferential wall of the upper shell (1) is provided with at least two second connecting parts (11) in one-to-one correspondence with the first connecting parts (51) along the circumferential direction, each second connecting hole (111) is formed in each second connecting part (11), at least two third connecting holes (22) in one-to-one correspondence with the first connecting holes (511) are formed in the lower shell (2) along the circumferential direction, and the corresponding first connecting holes (511), second connecting holes (111) and third connecting holes (22) are connected through fasteners (512).

10. The direct-current permanent magnet shielded booster pump of claim 9, wherein: the annular body (50) comprises an extension part (52) extending outwards along the radial direction of the periphery of the shielding sleeve (3) and an annular ring (53) extending vertically from the periphery of the extension part (52), a first connecting part (51) is formed on the periphery of the annular ring (53), the lower part of the upper shell (1) abuts against the annular ring (53) and a first sealing ring (A1) is arranged between the lower part of the upper shell and the annular ring, and the upper part of the lower shell (2) abuts against the annular ring (53) and a second sealing ring (A2) is arranged between the upper shell and the annular ring.

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