CN109185169B - Suction-stroke-free water pump, water pump assembling method and control method thereof - Google Patents

Abstract

The invention discloses a suction-stroke-free water pump, a water pump assembling method and a control method thereof. The suction-range-free water pump comprises a motor, a pump body and a controller, wherein the pump body comprises a shell and an impeller assembly arranged in the shell, a water inlet cavity and a water outlet cavity are formed in the shell, the motor is used for driving an impeller in the impeller assembly to rotate, the motor is connected with the controller, a water inlet pressure sensor used for detecting water pressure of the water inlet cavity is further arranged in the shell, and the water inlet pressure sensor is connected with the controller. The integration level and the reliability of the suction-free water pump and the water pump assembly method and the control method thereof are improved, and the occupied space is reduced. The water pump has compact integral structure, is convenient for on-site installation, and improves the use reliability.

Description

Suction-stroke-free water pump, water pump assembling method and control method thereof

Technical Field

The invention relates to the technical field of water supply equipment, in particular to a suction-free water pump, a water pump assembling method and a control method thereof.

Background

At present, the water pump in the prior art is used for measuring the service performance by taking the suction stroke of the water pump as a standard, and the suction Cheng Yuegao of the water pump represents that the better the performance. Therefore, the water pump in the prior art takes the increase of the suction stroke as a starting point for design and development. However, for the places directly pressurized by municipal pipe network pipelines, the water pump in the prior art can cause harm to the municipal pipe network pipelines due to overlarge suction stroke, and once negative pressure occurs, the municipal pipe network pipelines are easily sucked and shrunken, or the medium in the pipe network is polluted by reverse suction. In order to solve the above problems, the non-negative pressure complete water supply equipment is correspondingly generated, for example: according to the water supply equipment unit without the suction pipe disclosed in Chinese patent number 201120244316.7, devices such as a steady flow compensator and a vacuum compensator are added on the basis of a water pump, so that negative pressure influence on a front pipe network is avoided. Although the non-negative pressure complete water supply equipment can not influence the front pipe network, the water pump needs to be additionally provided with a plurality of supporting equipment to meet the working state without negative pressure, and the pipeline connection and the circuit connection are very complicated, so that the whole equipment has larger volume, complicated field installation and lower use reliability. How to design a water pump which has compact structure, high use reliability and convenient field installation is the technical problem to be solved by the invention.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the suction-stroke-free water pump, the water pump assembling method and the control method thereof are provided, the integral structure of the suction-stroke-free water pump is compact, the field installation is convenient, and the use reliability is improved.

The technical scheme includes that the suction-stroke-free water pump comprises a motor, a pump body and a controller, wherein the pump body comprises a shell and an impeller assembly arranged in the shell, a water inlet cavity and a water outlet cavity are formed in the shell, the motor is used for driving an impeller in the impeller assembly to rotate, the motor is connected with the controller, a water inlet pressure sensor used for detecting the water pressure of the water inlet cavity is further arranged in the shell, and the water inlet pressure sensor is connected with the controller.

Further, a signal wire of the water inlet pressure sensor penetrates through the inner cavity of the shell and is connected with the controller.

Further, the shell is further provided with a wiring pipe, the wiring pipe penetrates through the water outlet cavity in a sealing mode, and a signal wire of the water inlet pressure sensor penetrates through the wiring pipe to be connected with the controller.

Further, a mounting groove is formed in the shell, a first through hole communicated with the water inlet cavity is formed in the mounting groove, a second through hole communicated with the water outlet cavity is further formed in the mounting groove, a third through hole communicated with the water outlet cavity is further formed in the shell, the water inlet pressure sensor is arranged in the first through hole in a sealing mode, one end portion of the wire tube is connected in the second through hole in a sealing mode, and the other end portion of the wire tube is connected in the third through hole in a sealing mode.

Further, the shell is including sealing connection's pump seat, sleeve and pump head in proper order, be provided with on the pump seat mounting groove first through-hole with the second through-hole, be provided with on the pump head the third through-hole, the second through-hole with the third through-hole is the shoulder hole, still threaded connection has sealing nut on the shoulder hole, sealing nut with still be provided with the sealing washer between the shoulder face of shoulder hole, walk the spool and pass sealing nut with the sealing washer.

Further, a water outlet pressure sensor for detecting the water pressure of the water outlet cavity is further arranged on the shell, and the water outlet pressure sensor is connected with the controller.

Further, the controller is arranged on the motor, the motor is fixed on the shell through a connecting seat, a signal output terminal is arranged on the connecting seat, and a signal wire of the water inlet pressure sensor and a signal wire of the water outlet pressure sensor are connected with the controller through the signal output terminal respectively.

Further, a signal input terminal matched with the signal output terminal is arranged on the motor, the signal input terminal is connected with the controller through a cable, and the signal output terminal is connected with the signal input terminal.

The invention also provides an assembly method of the suction-free water pump, which comprises the following steps:

step 1, in the process of assembling a pump body, a wiring pipe is inserted into a sleeve and is connected between a pump seat and a pump head in a sealing manner;

step 2, connecting a water inlet pressure sensor on a pump seat in a sealing way, and leading out a signal wire of the water inlet pressure sensor to the outside of the pump body through a wiring pipe;

step 3, connecting the signal wire with the signal output terminal, then installing the signal output terminal on the connecting seat, and fixing the connecting seat on the pump head;

and 4, connecting the signal input terminal with the controller through a cable, then installing the signal input terminal on the shaft end surface of the motor, fixing the motor on the connecting seat, and connecting the signal input terminal with the signal output terminal while installing the motor in place.

The invention also provides a control method of the suction-free water pump, wherein a water inlet of the suction-free water pump is connected with a water supply network, and the control method comprises a normal water pressure water supply mode and a low water pressure water supply mode in the water supply process of the water supply network to the suction-free water pump;

in normal water pressure water supply mode: when the water inlet pressure sensor detects that the pressure value of water in the water inlet cavity is not lower than a set water supply pressure value P1, the controller controls the motor to normally operate;

in the low water pressure water supply mode: when the water inlet pressure sensor detects that the pressure value of the water in the water inlet cavity is lower than the set water supply pressure value P1, the controller reduces the running frequency of the motor so as to ensure that the water inlet pressure sensor detects that the pressure value of the water in the water inlet cavity is not lower than the set water supply pressure value P2; when the water inlet pressure sensor detects that the pressure value of the water in the water inlet cavity is lower than the set water supply pressure value P2, the controller stops the operation of the motor; wherein P1> P2.

Compared with the prior art, the invention has the advantages and positive effects that: according to the suction-free water pump, the water pump assembly method and the control method thereof, the water inlet pressure sensor is arranged in the shell of the pump body, so that the water pressure in the water inlet cavity can be detected in real time through the water inlet pressure sensor in the water supply process, the water inlet cavity is ensured not to form negative pressure, the water supply pipe network is ensured not to generate negative pressure, the effect of non-negative pressure water supply is realized, the devices such as a steady flow compensator and a vacuum compensator are not required to be additionally arranged, the water pump is only required to be connected with the water supply pipe network on site, the non-negative pressure water supply can be realized by independently utilizing the water pump, the whole structure of the suction-free water pump is compact, and the site installation is convenient; and the water inlet pressure sensor is integrated in the shell to directly detect the water pressure of the water inlet cavity, so that the external pressure sensor at the water inlet of the pump body is not needed, the signal wire of the water inlet pressure sensor is connected with the controller through the wiring in the shell, the situation that the external cable is damaged due to abrasion or dragging is avoided, and the use reliability is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a water pump of the present invention;

FIG. 2 is a schematic diagram of the water pump of the present invention;

FIG. 3 is a partial cross-sectional view of a water pump of the present invention;

FIG. 4 is a partial cross-sectional view of a second water pump of the present invention;

FIG. 5 is a schematic view of a plug terminal assembly according to the present invention;

FIG. 6 is a schematic diagram of the signal output terminal of FIG. 5;

fig. 7 is a schematic structural view of the signal input terminal in fig. 5;

FIG. 8 is a schematic diagram of a second embodiment of a plug terminal assembly according to the present invention;

FIG. 9 is a schematic diagram III of a plug terminal assembly according to the present invention;

fig. 10 is a schematic diagram of the structure of the signal output terminal in fig. 9;

fig. 11 is a schematic diagram of the structure of the signal input terminal in fig. 9.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1, the suction-side-free water pump of the embodiment comprises a motor 1, a pump body 2 and a controller 3, wherein the pump body 2 comprises a housing and an impeller assembly arranged in the housing, a water inlet cavity 201 and a water outlet cavity 202 are formed in the housing, the motor 1 is used for driving an impeller in the impeller assembly to rotate, the motor 1 is electrically connected with the controller 3, the controller 3 is arranged on a housing of the motor 1, a water inlet pressure sensor 41 for detecting the water pressure 201 of the water inlet cavity is further arranged in the housing, and the water inlet pressure sensor 41 is connected with the controller 3. Wherein the controller 3 may be fixed on the housing of the motor 1, preferably the controller 3 may be integrally provided inside the motor 1, for example: the motor forms in chinese patent nos. 201510370734.3, 201510525002.7, 2015170837. X, 201510370845.4, 201510370992.1 can be adopted.

Specifically, in this embodiment, the suction-free water pump is provided with the water inlet pressure sensor 41 for detecting the water pressure in the water inlet cavity 201 inside the housing of the pump body 2, and since the water inlet of the pump body 2 is connected with the water supply network, the water pressure of the water inlet cavity 201 is the same as the water pressure of the water supply network, and the water pressure value detected by the water inlet pressure sensor 41 can reflect the water pressure value of the water supply network, so that in actual use, the water pressure of the water inlet cavity 201 is detected in real time by the water inlet pressure sensor 41, and the running power of the motor is controlled by the controller, so that the water pressure in the water inlet cavity 201 is not lower than zero, and the effect of non-negative pressure water supply can be realized. The suction-stroke-free water pump of the embodiment utilizes the water pressure value detected by the water inlet pressure sensor 41 to feed back to the controller 3, and dynamically adjusts the running frequency of the motor 1 through the controller 3 so as to ensure that the water inlet cavity 201 cannot generate negative pressure, thereby realizing the purpose of not generating adverse effects on a water supply network and realizing non-negative pressure water supply. And because the water inlet pressure sensor 41 is integrated in the shell of the pump body 1, the signal wire of the water inlet pressure sensor 41 is connected with the controller 3 through the internal wiring of the shell, thereby avoiding the condition that the wires are messy and easy to be damaged due to abrasion or dragging caused by external wiring and improving the use reliability. Meanwhile, when in field installation, the water inlet of the pump body is connected with the water supply network, and then the water outlet of the pump body is connected with the network of the user terminal, so that the field installation can be completed, the field installation process is simplified, and the field installation efficiency is improved. Preferably, in order to provide constant pressure water supply for the user, a water outlet pressure sensor 42 for detecting the water pressure of the water outlet cavity 202 is further disposed on the housing of the pump body 2, and the water outlet pressure sensor 42 is connected with the controller 3. Specifically, the water outlet pressure sensor 42 is configured to detect the water outlet pressure of the water outlet connected to the water outlet cavity 202 in the water pump, that is, the pipe network water supply pressure of the user terminal, and feed back the pressure value detected by the water outlet pressure sensor 42 to the controller 3, where the controller 3 can adjust the frequency of the motor 1, so that the pressure value detected by the water outlet pressure sensor 42 is kept stable, so as to realize constant pressure water supply. In addition, it should be noted that the no-suction-stroke in the no-suction-stroke water pump of the invention means that there is no suction stroke at the water inlet of the water pump (i.e. no negative pressure is generated to the water supply network), but not that the no-suction-stroke water pump cannot deliver water to a high place.

When in actual use, the water inlet of the suction-free water pump is connected with the water supply network, and the control method of the suction-free water pump is specifically as follows after the water outlet of the suction-free water pump is connected with the network of the user terminal:

in the process of supplying water to the suction-free water pump by the water supply network, the control method comprises a normal water pressure water supply mode and a low water pressure water supply mode.

In normal water pressure water supply mode: when the intake water pressure sensor 41 detects that the pressure value of the water in the intake water chamber 201 is not lower than the set water supply pressure value P1, the controller 3 controls the motor 1 to operate normally. Specifically, when the water supply amount of the water supply network is sufficient, the water supply pressure value of the water supply network will be greater than the set water supply pressure value P1, at this time, the water inlet pressure sensor 41 detects that the pressure value of the water in the water inlet cavity 201 is fed back to the controller 3, then the controller 3 can control the motor 1 to operate normally, according to the water supply pressure requirement of the network of the user terminal, the water supply pressure value of the network of the user terminal is P0, then the controller 3 controls the motor 1 to increase the operating frequency until the pressure value detected by the water outlet pressure sensor 42 is the same as the water supply pressure value P0 required by the network of the user terminal, then the controller 3 controls the motor 1 to operate at a fixed frequency, at this time, the frequency of the fixed frequency operation of the motor 1 can meet that the pressure value detected by the water outlet pressure sensor 42 is always kept the same as the water supply pressure value P0 required by the network of the user terminal, so that the water pump performs constant pressure water supply. Under the condition that P0 is larger than P1, the water pressure of the water outlet cavity 202 of the water pump is increased by controlling the motor 1 to operate so as to meet the water supply pressure value requirement required by a pipe network of the user terminal; when P0 is smaller than P1, the controller 3 can control the motor 1 to stop working, and water can be supplied to the network of the user terminal only by means of water pressure of the water supply network, so that the operation energy consumption of the suction-free water pump can be greatly reduced.

In the low water pressure water supply mode: when the inlet water pressure sensor 41 detects that the pressure value of the water in the inlet water cavity 201 is lower than the set water supply pressure value P1, the controller 3 reduces the running frequency of the motor 1 so as to ensure that the inlet water pressure sensor 41 detects that the pressure value of the water in the inlet water cavity 201 is not lower than the set water supply pressure value P2; when the water inlet pressure sensor 41 detects that the pressure value of the water in the water inlet cavity 201 is lower than the set water supply pressure value P2, the controller 3 stops the operation of the motor 1; wherein P1> P2. Specifically, when the water supply amount of the water supply network is insufficient, the water supply pressure value of the water supply network will be smaller than the set water supply pressure value P1, when the water inlet pressure sensor 41 detects that the water pressure value in the water inlet cavity 201 is lower than P1, the water inlet pressure sensor 41 feeds back to the controller 3, then the controller 3 can control the motor 1 to reduce the operation frequency, and simultaneously ensure that the water pressure value in the water inlet cavity 201 is not lower than the set water supply pressure value P2, wherein the water supply pressure value P2 is a value near zero pressure of the water pressure value in the water inlet cavity 201, the specific value of P2 can be set according to actual needs, no limitation is made here, and the water pumping capability of the water pump can be weakened by reducing the operation frequency of the motor 1, so as to ensure that negative pressure cannot be caused to the water supply network in the water supply process. And as the water supply pressure of the water supply network continuously decreases, when the water inlet pressure sensor 41 detects that the pressure value of the water in the water inlet cavity 201 is lower than P2, the controller 3 stops the operation of the motor 1, so as to ensure that the water supply network does not generate negative pressure.

Further, as shown in fig. 2-4, since the water inlet of the pump body 2 is usually disposed away from the side of the motor 1, and the water outlet of the pump body 2 may be disposed close to or away from the side of the motor 1 as required, and correspondingly, the water inlet cavity 201 of the pump body 2 is also disposed away from the side of the motor 1, so that the installation position of the water inlet pressure sensor 41 is disposed away from the motor 1, how to make the signal line of the water inlet pressure sensor 41 conveniently and reliably pass through the pump body 2 to be routed from the inside and be connected with the controller 3 on the motor 1 is a key problem to be solved. The signal line 410 of the water inlet pressure sensor 41 in this embodiment penetrates the water outlet cavity 202 and is connected with the controller 3. Specifically, the casing 21 of the pump body 2 generally includes a pump seat 211, a sleeve 212 and a pump head 213 that are sequentially and hermetically connected, the impeller assembly 22 is located in the casing 21, a water inlet cavity 201 is formed between the impeller assembly 22 and the pump seat 211, a water outlet cavity 202 is formed between the impeller assembly 22 and the sleeve 212 and the pump head 213, a water inlet communicating with the water inlet cavity 201 is configured on the pump seat 211, and a water outlet communicating with the water outlet cavity 202 is arranged on the pump seat 211 or the pump head 213 as required; the motor 1 is mounted on a connecting seat 23 arranged on the pump head 213, and the controller 3 is arranged on the shell of the motor 1. The water inlet pressure sensor 41 is installed in the pump seat 211 to directly detect the pressure value of the water in the water inlet cavity 201, the signal wire 410 of the water inlet pressure sensor 41 needs to pass through the sleeve 212 and the pump head 213 to be connected with the controller 3, in order to realize the wiring of the signal wire 410 from the inside of the housing 21, the signal wire 410 of the water inlet pressure sensor 41 is led out from the pump seat 211 and passes through the water outlet cavity 202 and then is output from the pump head 213 to realize the wiring from the inside of the housing 21, in order to ensure the reliability of use, the positions of the signal wire 410 passing through the pump seat 211 and the pump head 213 need to be subjected to sealing treatment to ensure the water-electricity separation, preferably, the housing 21 is further provided with a wiring tube 24, the wiring tube 24 passes through the wiring tube 24 in a sealing manner, and the signal wire 410 of the water inlet pressure sensor 41 is connected with the controller 3. Specifically, the wiring tube 24 may be a hard tube such as a metal tube, and the wiring tube 24 is disposed between the pump seat 211 and the pump head 213 and penetrates through the water outlet cavity 202, so that the signal wire 410 is wired through the wiring tube 24, the signal wire 410 can be effectively protected through the wiring tube 24, the signal wire 410 is prevented from contacting with water in the water outlet cavity 202, and the safety and reliability in use are improved; in order to facilitate assembly, the pump seat 211 of the housing 21 is formed with a mounting groove 2111, the mounting groove 2111 is provided with a first through hole (not labeled) which is communicated with the water inlet cavity 201, the mounting groove 2111 is further provided with a second through hole which is communicated with the water outlet cavity 202, the pump head 213 of the housing 21 is further provided with a third through hole which is communicated with the water outlet cavity 202, the water inlet pressure sensor 41 is sealed in the first through hole, the pressure of water in the water inlet cavity 201 can be directly detected by the water inlet pressure sensor 41 through the first through hole, one end part of the water inlet pipe 24 is sealed and connected in the second through hole, the other end part of the water inlet pipe 24 is sealed and connected in the third through hole, specifically, two end parts of the water inlet pipe 24 are correspondingly inserted in the second through hole and the third through hole, thus, a waterproof water inlet channel is formed in the water outlet cavity 202 through the water inlet pipe 41, and the signal line 410 can be routed through the water inlet pipe 24. In order to improve the sealing reliability of the connection between the wiring tube 24 and the through hole, the second through hole and the third through hole are both stepped holes, the stepped holes are further connected with sealing nuts 241 in a threaded manner, sealing rings 242 are further arranged between the sealing nuts 241 and the stepped surfaces of the stepped holes, the wiring tube 24 passes through the sealing nuts 241 and the sealing rings 242, specifically, in the assembling process, the wiring tube 24 is inserted into the second through hole, then the sealing rings 242 and the sealing nuts 241 are sequentially installed into the second through hole, and in the screwing process of the sealing nuts 241, the sealing rings 242 are extruded and deformed, so that the connection area between the inner wall of the second through hole and the outer wall of the wiring tube 24 is effectively sealed by the sealing rings 242, water leakage of the water cavity 202 in the second through hole is avoided, and in the same way, the wiring tube 24 is inserted into the third through hole on the pump head 213, and the corresponding sealing rings 242 and sealing nuts 241 are adopted for sealing. Wherein, still be provided with detachable access cover 2112 on the mounting groove 2111, can be convenient through opening access cover 2112 to carry out dismouting maintenance to intake pressure sensor 41. Likewise, in order to realize the function of the routing tube 24, a routing channel may be formed in the housing 21 by drilling, specifically, a drilling channel is formed by drilling holes in the pump seat 211, the sleeve 212 and the pump head 213, and two adjacent sections of drilling channels are connected in a sealing manner, where the sealing manner may be in a form of a sealing gasket or a sealing glue, for example: sealing gaskets or sealant are added between the pump seat 211 and the sleeve 212 and between the sleeve 212 and the pump head 213 at corresponding positions, and after the pump seat 211, the sleeve 212 and the pump head 213 are connected, the sealing gaskets are extruded to effectively seal the connecting areas formed between two adjacent sections of drilling passages.

Furthermore, in order to realize reliable and effective convenient installation between the pressure sensor and the controller 3, the plug terminal assembly 5 can be adopted to realize electrical connection between the pressure sensor and the controller 3, specifically, the plug terminal assembly 5 comprises a signal output terminal 51 and a signal input terminal 52, the signal output terminal 51 is arranged on the connecting seat 23, the signal wire of the water inlet pressure sensor 41 and the signal wire of the water outlet pressure sensor 42 are respectively connected with the signal output terminal 51, the motor 1 is correspondingly provided with the signal input terminal 52, a cable of the signal input terminal 52 passes through the internal wiring of the shell of the motor 1 and is connected with the controller 3, the signal input terminal 52 is assembled on the motor 1 in the assembly process of the motor 1, meanwhile, the controller 3 is also installed on the motor 1, the electrical connection between the controller 3 and the signal input terminal 52 is completed in the processing assembly process of the motor 1, and the pump body 2 are simultaneously installed on the pump body 2, thus, the final assembly can be directly carried out on the motor 1, the signal input terminal is directly installed on the motor 2, the signal input terminal is connected with the pump body 2, the signal input terminal is well-connected with the pump body 3, and the user is connected with the water pump 3 in the field, and the user has better quality. In order to achieve a firm electrical connection between the signal output terminal 51 and the signal input terminal 52, as shown in fig. 5-7, the signal output terminal 51 includes a first base 511 and a plurality of plugging portions 512 disposed on the first base 511, the signal input terminal 52 includes a second base 521 and a plurality of plugging mating portions 522 disposed on the second base 521, the plugging portions 512 are configured to be plugged with the corresponding plugging mating portions 522, the plugging mating portions 522 are electrically connected with the controller 3 through cables, the first base 511 is disposed on the connection base 23, and the second base 521 is disposed on the motor 1. Specifically, the signal output terminal 51 and the signal input terminal 52 are respectively installed through the corresponding bases, and the electrical connection portion is in plug connection through the plug connection portion 512 and the plug connection mating portion 522, so that in the process of assembling the motor 1 and the pump body 2, the plug connection portion 512 and the plug connection mating portion 522 can be connected, the circuit connection between the pressure sensor and the controller 3 is synchronously completed, and the assembling process is simplified. In order to improve the reliability of the plug connection, the first base 511 is provided with a first mounting hole, a slidable slide seat 513 is disposed in the first mounting hole, the plug portion 512 is disposed on the slide seat 513 in an insulating manner, a return spring 514 is further disposed between the slide seat 513 and the first base 511, specifically, during the process of assembling the motor 1 and the pump body 2, the plug portion 512 and the plug mating portion 522 approach each other and contact each other as the motor 1 approaches the connecting seat 23, when the motor 1 contacts the connecting seat 23 and is fixed on the connecting seat 23, the plug portion 512 and the plug mating portion 522 abut against each other, and the plug portion 512 is pushed by the plug mating portion 522 to enable the slide seat 513 to move and compress the return spring 514, so that good contact electrical connection between the plug portion 512 and the plug mating portion 522 can be ensured under the elastic force of the return spring 514. A second mounting hole is formed in the sliding seat 513, a first insulating seat 515 is arranged in the second mounting hole, the plug-in portion 512 is arranged on the first insulating seat 515, a third mounting hole is formed in the second base 521, a second insulating seat 523 is arranged in the third mounting hole, the plug-in matching portion 522 is arranged on the second insulating seat 523, and the plug-in portion 512 and the plug-in matching portion 522 are correspondingly arranged through the insulating seats, so that the plug-in portions 512 are mutually insulated, and the plug-in matching portions 522 are mutually insulated; while the representation of the mating portion 512 and the mating portion 522 may take a variety of forms, such as: the plug portion 512 is a pin, and the plug mating portion 522 is a socket; alternatively, the mating portion 512 is a socket, and the mating portion 522 is a pin. Preferably, in order to well protect the plugging portion 512 and the plugging mating portion 522 in the plugging process, the outer end of the plugging mating portion 512 is located at the inner side of the outer end surface of the second mounting hole, the outer end of the plugging mating portion 522 is located at the inner side of the outer end surface of the third mounting hole, the outer end of the sliding seat 513 extends out of the first base 511, a guiding support sliding pair is formed between the outer wall of the sliding seat 513 and the hole wall of the third mounting hole, specifically, the plugging portion 512 is located in the second mounting hole, the outer end of the plugging portion 512 is not exposed to the second mounting hole, and likewise, the plugging mating portion 522 is located in the third mounting hole, and the outer end of the plugging mating portion 522 is not exposed to the second mounting hole, so that the sliding seat 513 is firstly inserted into the third mounting hole in the assembling process of the motor 1 and the pump body 2, and the sliding seat 513 is mutually matched with the third mounting hole to carry out guiding support in the sliding manner in the sliding seat 513 in the sliding manner in the third mounting hole, so that the plugging portion 512 and the plugging mating portion 522 are stably and the plugging portion 522 are not plugged together in the same straight line due to shaking condition. Still further, as shown in fig. 8, the first base 511 and the second base 521 are respectively provided with a cable plug 53, the cable plug 53 includes a plug 531 and a plurality of signal cables 532, the plug 531 forms a plurality of conductive rings 533 arranged at intervals in the length direction, and the conductive rings 533 are electrically connected to the corresponding signal cables 532; each of the first bases 511 and the second bases 521 is provided with a jack (not shown), each of the plugging portions 512 is provided with a first conductive portion 5121 extending to the inside of the jack in the first base 511, each of the plugging mating portions 522 is provided with a second conductive portion 5221 extending to the inside of the jack in the second base 521, the plurality of first conductive portions 5121 are arranged at intervals in the longitudinal direction of the corresponding jack, the plurality of second conductive portions 5221 are arranged at intervals in the longitudinal direction of the corresponding jack, after the cable plug 53 is inserted into the inside of the jack in the first base 511, the conductive ring 533 on the cable plug 53 is in contact electrical connection with the corresponding first conductive portion 5121, similarly, after the cable plug 53 is inserted into the inside of the jack in the second base 521, the conductive ring 533 on the cable plug 53 is in contact electrical connection with the corresponding second conductive part 5221, specifically, the cable plug 53 is designed to have a structure similar to that of an earphone plug, so that the signal cable 532 of the signal cable plug 53 of the pressure sensor can be quickly connected with the signal output terminal 51 through the cable plug 53, while the signal cable 532 corresponding to the cable plug 53 inserted into the signal input terminal 52 is connected with the controller 3, the signal cable 532 of the cable plug 53 can be connected with the corresponding pressure sensor or the controller 3 at first at the outside in the independent assembly process of the motor 1 and the pump body 2, then, the connection can be completed only by inserting the corresponding cable plug 53 when the signal output terminal 51 and the signal input terminal 52 are installed, the connection of a single wire is not required in a narrow space after the signal output terminal 51 and the signal input terminal 52 are fixed, the assembly efficiency is improved. In addition, in order to improve connection reliability and convenience between the motor 1 and the connection base 23, the connection base 23 is provided with a first flange 231, a second flange 11 is provided on an axial end surface of the motor 1, the first flange 231 is connected with the second flange 11 through bolts, the first base 511 is provided on the first flange 231, and the second base 521 is provided on the second flange 11. In order to ensure that the plug terminal assembly 5 can be reliably and accurately connected in the process of mounting the motor 1 on the connecting seat 23, the first flange 231 is provided with a protruding guide post 232, the second flange 11 is provided with a guide groove 111, the guide post 232 is inserted into the guide groove 111, and specifically, when the motor 1 is connected with the connecting seat 23, the signal output terminal 51 and the signal input terminal 52 can be accurately plugged together by matching the guide post 232 with the guide groove 111.

Similarly, the signal output terminal 51 and the signal input terminal 52 may be plug-connected by means of earphone plug connection, specifically, as shown in fig. 9-11, the signal output terminal 51 includes a first base 511 and a plug 512 disposed on the first base 511, where the plug 512 forms a plurality of conductive rings 5121 arranged at intervals in the length direction, and each conductive ring 5121 is connected with a first cable 510 extending outside the first base 511; the signal input terminal 521 includes a second base 521, a socket 522 provided on the second base 521, and a plurality of conductive parts 5221 insulated from each other and engaged with the conductive ring 5121 provided in the socket 522, each of the conductive parts 5221 being connected to a second cable 520 extending to the outside of the second base 521; the second cable 520 is electrically connected to the controller 3, the first base 511 is disposed on the connection base 23, and the second base 521 is disposed on the motor 1. Specifically, during the plugging process of the signal output terminal 51 and the signal input terminal 52, the plug 512 of the signal output terminal 51 is similar to the structure of an earphone plug, the plug 512 is configured with a plurality of conductive rings 5121 arranged at intervals in an insulating manner, and after the plug 512 is inserted into the socket 522, the conductive rings 5121 are contacted with and electrically connected to corresponding conductive portions 5221 in the socket 522. The conductive portion 5221 can be implemented by elastic conductive contacts, and the like, and can refer to a structural form of the earphone jack. Meanwhile, in order to improve the reliability of the plug connection, a first mounting hole is formed in the first base 511, a first insulating seat 513 that can slide is disposed in the first mounting hole, a return spring 514 is further disposed between the first insulating seat 513 and the first base 511, and the plug 512 is fixedly disposed on the first insulating seat 513; the second base 521 is provided with a second mounting hole, a second insulating seat 523 is disposed in the second mounting hole, the jack seat 522 is fixed on the second insulating seat 523, specifically, the plug 512 is completely inserted into the jack seat 522, and as the motor 1 continues to move close to the connecting seat 23, the first insulating seat 513 moves in the first mounting hole and compresses the return spring 514, so that under the elastic force of the return spring 514, the plug 512 can be ensured to be always and completely inserted into the jack seat 522, so as to ensure good contact electrical connection between the conductive ring 5121 and the corresponding conductive portion 5221. Preferably, a protective sleeve 515 is disposed on the first insulating seat 513, and the protective sleeve 515 surrounds the outside of the plug 512; after the signal input terminal 52 is connected with the signal output terminal 51 in a plugging manner, the protection sleeve 515 is inserted into the second mounting hole, specifically, in the plugging process of the signal input terminal 52 and the signal output terminal 51, the protection sleeve 515 is inserted into the second mounting hole along with the gradual approach of the two terminals, then the plug 512 is correspondingly inserted into the jack mount 522, the protection sleeve 515 and the second mounting hole are used for guiding the plug, so that the plug 512 can be ensured to be accurately inserted into the jack mount 522, and the situation that the plug 512 is broken due to misalignment of the plug 512 and the jack mount 522 when the motor 1 and the pump body 2 are assembled is avoided, thereby improving the use reliability.

The invention also provides an assembly method of the suction-free water pump, which comprises the following steps:

step 1, in the process of assembling the pump body, the wiring pipe is inserted into the sleeve and is connected between the pump seat and the pump head in a sealing manner. In particular, the wiring tube is integrally mounted in the housing of the pump body during assembly of the pump body.

And 2, hermetically connecting the water inlet pressure sensor on the pump seat, and leading out a signal wire of the water inlet pressure sensor to the outside of the pump body through the wiring pipe. Specifically, after the water inlet pressure sensor is arranged on the pump seat, a signal wire of the water inlet pressure sensor passes through the water outlet cavity of the pump body through the wiring pipe and is led out of the pump head to the outside of the shell.

Step 3, connecting the signal wire with the signal output terminal, then installing the signal output terminal on the connecting seat, and fixing the connecting seat on the pump head;

and 4, connecting the signal input terminal with the controller through a cable, then installing the signal input terminal on the shaft end surface of the motor, fixing the motor on the connecting seat, and connecting the signal input terminal with the signal output terminal while installing the motor in place. Specifically, the cable of the signal input terminal is routed through the interior of the motor housing and connected to the controller.

Compared with the prior art, the invention has the advantages and positive effects that: the water inlet pressure sensor is arranged in the shell of the pump body, so that in the water supply process, the water pressure in the water inlet cavity can be detected in real time through the water inlet pressure sensor, the water inlet cavity is ensured not to form negative pressure, so that a water supply pipe network is ensured not to generate negative pressure, the effect of non-negative pressure water supply is realized, devices such as a steady flow compensator and a vacuum compensator are not required to be additionally arranged, only the water pump is required to be connected with the water supply pipe network on site, the water pump can be independently utilized to realize non-negative pressure water supply, the whole structure of the non-suction-range water pump is compact, and the site installation is convenient; the water pressure sensor is integrated in the shell to directly detect the water pressure of the water inlet cavity, so that the water inlet of the pump body is not required to be externally connected with the pressure sensor, a signal wire of the water pressure sensor is connected with the controller through a wiring in the shell, the situation that an external cable is messy and damaged due to abrasion or dragging is avoided, and the use reliability is improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. The suction-free water pump comprises a motor, a pump body and a controller, wherein the pump body comprises a shell and an impeller assembly arranged in the shell, a water inlet cavity and a water outlet cavity are formed in the shell, the motor is used for driving an impeller in the impeller assembly to rotate, and the motor is connected with the controller;

the controller is configured to detect the water pressure of the water inlet cavity in real time according to the water inlet pressure sensor and control the running power of the motor so that the water pressure in the water inlet cavity is not lower than zero; the shell is further provided with a wiring pipe, the wiring pipe penetrates through the water outlet cavity in a sealing mode, and a signal wire of the water inlet pressure sensor penetrates through the wiring pipe and is connected with the controller;

the shell is also provided with a water outlet pressure sensor for detecting the water pressure of the water outlet cavity, and the water outlet pressure sensor is connected with the controller;

the controller is arranged on the motor, the motor is fixed on the shell through a connecting seat, a signal output terminal is arranged on the connecting seat, and a signal wire of the water inlet pressure sensor and a signal wire of the water outlet pressure sensor are respectively connected with the controller through the signal output terminal; the motor is provided with a signal input terminal matched with the signal output terminal, the signal input terminal is connected with the controller through a cable, and the signal output terminal is connected with the signal input terminal;

the signal output terminal comprises a first base and a plurality of plug-in parts arranged on the first base, the signal input terminal comprises a second base and a plurality of plug-in matching parts arranged on the second base, the plug-in matching parts are used for being in plug-in connection with the corresponding plug-in matching parts, the plug-in matching parts are electrically connected with the controller through cables, the first base is arranged on the connecting seat, and the second base is arranged on the motor; the first base is provided with a first mounting hole, a sliding seat capable of sliding is arranged in the first mounting hole, the plug-in part is arranged on the sliding seat in an insulating mode, and a reset spring is further arranged between the sliding seat and the first base.

2. The suction-free water pump according to claim 1, wherein a mounting groove is formed on the housing, the mounting groove is provided with a first through hole communicated with the water inlet cavity, the mounting groove is further provided with a second through hole communicated with the water outlet cavity, the housing is further provided with a third through hole communicated with the water outlet cavity, the water inlet pressure sensor is hermetically arranged in the first through hole, one end part of the wire pipe is hermetically connected in the second through hole, and the other end part of the wire pipe is hermetically connected in the third through hole.

3. The suction-stroke-free water pump according to claim 2, wherein the housing comprises a pump seat, a sleeve and a pump head which are sequentially connected in a sealing manner, the pump seat is provided with the mounting groove, the first through hole and the second through hole, the pump head is provided with the third through hole, the second through hole and the third through hole are all stepped holes, the stepped holes are further connected with sealing nuts in a threaded manner, a sealing ring is further arranged between the sealing nuts and the stepped surfaces of the stepped holes, and the wiring pipe penetrates through the sealing nuts and the sealing ring.

4. A method of assembling a suction side free water pump as claimed in any one of claims 1 to 3, comprising:

step 1, in the process of assembling a pump body, a wiring pipe is inserted into a sleeve and is connected between a pump seat and a pump head in a sealing manner;

step 2, connecting a water inlet pressure sensor on a pump seat in a sealing way, and leading out a signal wire of the water inlet pressure sensor to the outside of the pump body through a wiring pipe;

step 3, connecting the signal wire with the signal output terminal, then installing the signal output terminal on the connecting seat, and fixing the connecting seat on the pump head;

and 4, connecting the signal input terminal with the controller through a cable, then installing the signal input terminal on the shaft end surface of the motor, fixing the motor on the connecting seat, and connecting the signal input terminal with the signal output terminal while installing the motor in place.

5. A control method of a suction side-free water pump according to any one of claims 1 to 3, wherein a water inlet of the suction side-free water pump is connected to a water supply network, and the control method includes a normal water pressure water supply mode and a low water pressure water supply mode during water supply from the water supply network to the suction side-free water pump;

in normal water pressure water supply mode: when the water inlet pressure sensor detects that the pressure value of water in the water inlet cavity is not lower than a set water supply pressure value P1, the controller controls the motor to normally operate;

in the low water pressure water supply mode: when the water inlet pressure sensor detects that the pressure value of the water in the water inlet cavity is lower than the set water supply pressure value P1, the controller reduces the running frequency of the motor so as to ensure that the water inlet pressure sensor detects that the pressure value of the water in the water inlet cavity is not lower than the set water supply pressure value P2; when the water inlet pressure sensor detects that the pressure value of the water in the water inlet cavity is lower than the set water supply pressure value P2, the controller stops the operation of the motor; wherein P1> P2.