CN113757087B

CN113757087B - Diaphragm pump with reflux structure

Info

Publication number: CN113757087B
Application number: CN202111046272.1A
Authority: CN
Inventors: 熊颖申; 邓高彬; 雷立强
Original assignee: Shenzhen Cnht Ltd
Current assignee: Shenzhen Cnht Ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2023-05-05
Anticipated expiration: 2041-09-07
Also published as: CN116498531A; CN113757087A; CN116498530A

Abstract

The invention provides a diaphragm pump with a backflow structure, which comprises a motor, a pump body, an eccentric wheel, a driving piece, a diaphragm, a water inlet rubber head, a water inlet spring, a water outlet rubber head, a water outlet spring, a sealing gasket and an elastic mechanism, wherein the motor is arranged on the pump body; the two sides of the pump body are provided with isolation cavities, the other two sides are respectively provided with a water inlet channel and a water outlet channel, a movable water inlet rubber head is arranged between the isolation cavities and the water inlet channels, a movable water outlet rubber head is arranged between the isolation cavities and the water outlet channels, and the motor drives the membrane to move in a reciprocating manner through the driving piece. Be provided with the backward flow chamber on the pump body, backward flow chamber and inlet channel and with the outlet channel intercommunication, elastic mechanism is with sealing gasket elasticity press-fit in the backward flow intracavity for sealing gasket elasticity separation inlet channel and outlet channel between the intercommunication, when outlet channel's operating pressure is too big, outlet channel's pressure just can push away sealing gasket, makes unnecessary fluid enter into the inlet channel through the backward flow chamber, forms the backward flow protection, thereby guarantees to spray the accurate stability of pressure.

Description

Diaphragm pump with reflux structure

Technical Field

The invention relates to the field of electric pumps, in particular to a diaphragm pump with a backflow structure.

Background

The electric pump is a common fluid driving device in daily life, is widely applied to the fields of agricultural production, industrial production and the like, such as a diaphragm pump with a backflow structure, has more and more wide application in the fields of disinfection spraying, pesticide spraying, water pumping and car washing, garden equipment and the like in recent years, and particularly, the appearance of novel coronaviruses is generated, so that a large number of disinfection spraying equipment is generated. However, most of the diaphragm pumps with backflow structures in the prior art have the technical problem of unstable spraying pressure, and further forward development and popularization and application in the field are severely limited.

It is desirable to provide a diaphragm pump with a return flow structure to solve the above-mentioned problems.

Disclosure of Invention

The invention provides a diaphragm pump with a backflow structure, which solves the problem that the diaphragm pump with the backflow structure in the prior art has unstable spraying pressure.

In order to solve the technical problems, the technical scheme of the invention is as follows: a diaphragm pump having a return flow structure, comprising: the device comprises a motor, a pump body, an eccentric wheel, a driving piece, a diaphragm, a water inlet rubber head, a water inlet spring, a water outlet rubber head, a water outlet spring, a sealing gasket and an elastic mechanism;

the two sides of the pump body are respectively isolated by the diaphragms to form isolation cavities, the other two sides of the pump body are respectively provided with a water inlet channel and a water outlet channel, the isolation cavities are communicated with the water inlet channels through water inlet through holes, the isolation cavities are communicated with the water outlet channels through water outlet through holes, the water inlet rubber heads are elastically isolated by the water inlet springs and arranged in the water inlet through holes, the water outlet rubber heads are elastically isolated by the water outlet springs and arranged in the water outlet through holes, the eccentric wheel is connected between the driving piece and the motor, and the two sides of the driving piece are respectively connected with one diaphragm;

the pump body is provided with a backflow cavity, the backflow cavity is communicated with the water inlet channel and the water outlet channel, and the elastic mechanism elastically presses the sealing gasket into the backflow cavity, so that the sealing gasket elastically blocks the communication between the water inlet channel and the water outlet channel.

In the invention, the elastic mechanism comprises a top cover, a first spring, a spring seat, a spring pad and a first screw;

the top cap with pump body fixed connection just forms and sets up the chamber, first spring the spring holder with the spring pad all is located set up the intracavity, just first spring coupling is in the spring pad with between the spring holder, the spring holder with sealing gasket contact, first screw rod piece with top cap threaded connection, first screw rod piece one end extends to set up the intracavity with the spring pad contact.

Wherein, the elastic mechanism still includes: a second spring, a second screw member, and a connection plate;

the spring seat is provided with a first boss, the first boss is provided with a second boss, one end of the first spring is positioned and sleeved on the periphery of the first boss, the second spring is positioned at the inner side of the first spring, and one end of the second spring is positioned and sleeved on the periphery of the second boss;

the top cover is provided with a containing cavity, the first screw rod piece is located in the containing cavity, the connecting plate is connected in the containing cavity, the second screw rod piece is in threaded connection with the connecting plate, the first screw rod piece and the spring pad are provided with axial through holes, and the second screw rod piece is located in the through holes and one end of the second screw rod piece is connected with the second spring.

Further, be provided with the fixed orifices on the top cap, the fixed orifices is followed the radial direction of top cap extends, the connecting plate is the slat, the both ends of connecting plate are fixed connection respectively in one in the fixed orifices, elastic mechanism still includes the fastener, the fastener is followed the radial direction joint of top cap is in on the top cap, the both ends of fastener block the both ends of fixed orifices are in order to restrict the connecting plate.

Further, the clamping piece comprises a cross rod and a longitudinal rod, the two longitudinal rods are in threaded connection with two ends of the cross rod, a first matching groove is formed in the first screw rod, and a second matching groove matched with the longitudinal rod is formed in the second screw rod, so that the second screw rod can be twisted to rotate through the longitudinal rod;

the longitudinal rod comprises a first working position and a second working position on the transverse rod;

when the longitudinal bars are positioned at the first working position, the longitudinal bars are positioned at the end parts of the transverse bars, and the two longitudinal bars are used for limiting the connecting plates;

when the longitudinal bars are located at the second working position, the longitudinal bars are located at a set distance from the end parts of the transverse bars, and the two longitudinal bars are aligned with one of the first matching grooves respectively, so that the first screw rod piece can be twisted to rotate through the clamping piece.

In addition, the horizontal both sides of connecting plate be provided with the relative position of keeping away of first screw rod spare is kept away and is put in top surface and the bottom of connecting plate and is close to keep away the position of position and all be provided with the enhancement portion, one side intercommunication of fixed orifices be provided with the mounting hole of fixed orifices intercommunication, the mounting hole is used for enhancement portion penetrates to hold the intracavity, the mounting hole is the through-hole, the fixed orifices is the blind hole, the vertical pole card is in the mounting hole and will the connecting plate restriction is in the fixed orifices.

In the invention, the pump body comprises end covers on two sides, an isolation cavity is arranged between the end covers and the membrane, two ends of the water outlet through hole are respectively connected with one isolation cavity, a clamping block is arranged in the water outlet through hole, the water outlet spring is positioned between the clamping block and the water outlet rubber head, and the water inlet spring is positioned between the end covers and the water inlet rubber head;

the fixture block comprises a first split block and a second split block, the first split block and the second split block are arranged in the water outlet through hole in a sliding mode, a sliding extending track is consistent with the elastic direction of the water outlet spring, one side, away from the second split block, of the first split block and one side, away from the first split block, of the second split block are respectively provided with one water outlet spring, the diaphragm pump with a backflow structure further comprises an adjusting component, and the adjusting component is detachably arranged between the first split block and the second split block to extrude the first split block and the second split block, so that elastic potential energy of the water outlet spring is adjusted.

The adjusting assembly comprises a fixed part, a fixed plate and a movable plate, wherein the two fixed plates are respectively connected to two sides of the fixed part, the two fixed plates are positioned on the same plane, a connecting column is arranged on the fixed plate, and a plurality of movable plates are detachably connected with the connecting column, so that different numbers of movable plates can be adjusted to one fixed plate;

the fixed plate and the movable plate arranged on the fixed plate are arranged between the first split block and the second split block, so that the distance between the first split block and the second split block is adjusted;

the fixed plate and the movable plate are respectively provided with a magnetic attraction part for mutually magnetic attraction and fixation, and the magnetic attraction parts are of annular structures.

Further, two ends of the fixing part are provided with sliding blocks, the inner wall of the water outlet channel is provided with sliding grooves matched with the sliding blocks, and one end, close to the clamping block, of each sliding groove is communicated with a clamping groove used for being clamped with the sliding blocks;

an opposite interface matched with the adjusting component is arranged between the first split block and the second split block, and the first split block and the second split block are arranged in the water outlet through hole in a sliding manner, so that the opposite interface is provided with a first movable position and a second movable position;

when the interface is positioned at the first movable position, the interface is opposite to the clamping groove;

when the butt joint interface is positioned at the second movable position, the butt joint interface is opposite to the sliding groove;

the water outlet springs on two sides of the clamping block enable the butt joint to be located at the first movable position, a guide inclined plane is arranged on the edge, close to the clamping groove, of the butt joint, and when the butt joint is located at the first movable position, the guide inclined plane is opposite to the sliding groove.

In addition, be provided with the regulation hole on the end cover with the water inlet spring relative position the regulation downthehole an organic whole of moulding plastics has the elastic sealing piece, the water inlet spring with the inboard contact of elastic sealing piece, be provided with the screw thread on the regulation hole inner wall, the one end that the regulation hole is close to outside is connected with adjusting screw, adjusting screw with the outside contact of elastic sealing piece is used for the extrusion regulation water inlet spring.

Compared with the prior art, the invention has the beneficial effects that: according to the diaphragm pump with the backflow structure, the backflow cavity, the sealing gasket and the elastic mechanism are arranged, the backflow cavity is communicated with the water inlet channel and the water outlet channel, the sealing gasket is elastically pressed and fixed in the backflow cavity by the elastic mechanism, so that the sealing gasket is elastically blocked from being communicated with the water inlet channel and the water outlet channel, the strong driving force of the motor can ensure enough water outlet pressure, and when the working pressure of the water outlet channel is overlarge, the pressure of the water outlet channel pushes away the sealing gasket, so that redundant fluid enters the water inlet channel through the backflow cavity to form backflow protection, and the accurate and stable spraying pressure is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments are briefly described below, and the drawings in the following description are only drawings corresponding to some embodiments of the present invention.

Fig. 1 is a front view of a diaphragm pump having a return flow structure of the present invention.

Fig. 2 is a right side view of the diaphragm pump with the return flow structure of the present invention.

Fig. 3 is a sectional view taken along the line X-X in fig. 2.

FIG. 4 is a cross-sectional view taken along the Y-Y section line in FIG. 1

Fig. 5 is an exploded structural view of the diaphragm pump with a return flow structure of the present invention.

Fig. 6 is a schematic view showing a structure in which a second spring and a second screw member are provided to a diaphragm pump having a return structure according to the present invention.

Fig. 7 is a schematic structural diagram of the engaging member of the diaphragm pump with the backflow structure and the first screw member.

Fig. 8 is a schematic structural view of a fixing plate of a diaphragm pump having a return structure of the present invention.

Fig. 9 is a schematic structural view of a diaphragm pump setting adjustment assembly with a return flow structure of the present invention.

Fig. 10 is a schematic structural view of an adjusting assembly of a diaphragm pump having a backflow structure of the present invention.

Fig. 11 is a schematic structural view of the diaphragm pump with a backflow structure of the present invention when the adjusting assembly is not inserted into the opposite interface.

Fig. 12 is a schematic view showing the structure of the adjusting assembly of the diaphragm pump with the reflux structure when the adjusting assembly is inserted into the opposite interface.

Fig. 13 is a schematic view of the fixing holes and the mounting holes inside the top cover of the diaphragm pump with a return structure of the present invention.

Fig. 14 is a schematic view of the structure in which the vertical rod is locked in the mounting hole and the connecting plate is limited in the fixing hole.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.

Most of diaphragm pumps with backflow structures in the prior art have the technical problem of unstable spraying pressure, and further forward development and popularization and application in the field are severely limited.

The following is a first embodiment of a diaphragm pump with a backflow structure, which can solve the above technical problems.

In the drawings, like structural elements are denoted by like reference numerals.

Referring to fig. 3 to 5, a first embodiment of a diaphragm pump with a backflow structure according to the present invention is as follows: a diaphragm pump having a return flow structure, comprising: the motor 11, the pump body 12, the eccentric wheel 19, the driving piece 18, the diaphragm 15, the water inlet rubber head 17, the water inlet spring 171, the water outlet rubber head 1C, the water outlet spring 1C1, the sealing gasket 156 and the elastic mechanism.

The two sides of the pump body 12 are respectively isolated by the diaphragms 15 to form isolation cavities 122, the other two sides are respectively provided with a water inlet channel 13 and a water outlet channel 14, the isolation cavities 122 are communicated with the water inlet channel 13 through water inlet through holes 131, the isolation cavities 122 are communicated with the water outlet channel 14 through water outlet through holes 141, the water inlet rubber heads 17 are elastically isolated and arranged in the water inlet through holes 131 through water inlet springs 171, the water outlet rubber heads 1C are elastically isolated and arranged in the water outlet through holes 141 through water outlet springs 1C1, the eccentric wheels 19 are connected between the driving piece 18 and the motor 11, and the two sides of the driving piece 18 are respectively connected with one diaphragm 15, so that the two isolation cavities 122 are isolated, and the diaphragm pump can generate large flow and large jet pressure.

The eccentric wheel 19 is externally sleeved with a bearing 1A, the eccentric wheel 19 is rotatably connected with a driving piece 18 through the bearing 1A, as shown in fig. 5, two connecting terminals for connecting with a diaphragm 15 are arranged on two sides of the driving piece 18, the lower end of the diaphragm 15 is connected with the driving piece 18, and the upper end of the diaphragm 15 is provided with a through hole for butting with a water inlet through hole 131 and a water outlet through hole 141.

The support 1B is connected to one side of the output shaft of the motor 11, and two ends of the support 1B extend out of the side face of the motor 11, so that the support 1B is conveniently connected with the pump body 12.

The sleeve 1D can be arranged between the water inlet rubber head 17 and the membrane 15 and between the water outlet rubber head 1C and the membrane 15, so that the replacement with low cost is convenient after aging and abrasion.

The outer sides of the water inlet channel 13 and the water outlet channel 14 can be provided with threads, so that the water inlet channel and the water outlet channel are reliably and stably connected with an external pipeline, and water leakage can not occur during long-time working.

The eccentric wheel 19 can be made of powder metallurgy materials, so that high-temperature deformation caused by friction can be effectively avoided, and the service life is effectively prolonged.

The pump body 12 is provided with a backflow cavity 157, the backflow cavity 157 is communicated with the water inlet channel 13 and the water outlet channel 14, and the sealing gasket 156 is elastically pressed and fixed in the backflow cavity 157 by the elastic mechanism, so that the sealing gasket 156 elastically blocks the communication between the water inlet channel 13 and the water outlet channel 14.

Referring to fig. 3, the elastic mechanism in the present embodiment includes a top cover 152, a first spring 154, a spring seat 155, a spring pad 153, and a first screw member 151.

Top cap 152 and pump body 12 fixed connection and formation set up the chamber, first spring 154, spring holder 155 and spring pad 153 all are located and set up the intracavity, and first spring 154 connects between spring pad 153 and spring holder 155, spring holder 155 and sealing gasket 156 contact, spring holder 155 can be spacing to first spring 154 formation, the bottom surface of spring holder 155 can form steady pressure to whole sealing gasket 156 simultaneously and admittedly, keep the accurate control to the backward flow, first screw member 151 and top cap 152 threaded connection, first screw member 151 one end extends to set up the intracavity and contacts with spring pad 153, make through the extrusion force of screwing up first screw member 151 adjustable to first spring 154.

In fig. 5, screws may be used to fixedly connect the top cover 152 and the pump body 12, and the end cover 121 and the pump body 12.

When the diaphragm pump of this embodiment works, the motor 11 drives the eccentric wheel 19 to rotate, so that the driving member 18 can be driven to reciprocate left and right together, the driving member 18 makes the diaphragm 15 move back and forth in the isolation cavity 122, in this process, the isolation cavity 122 on one side is compressed, after the fluid in the isolation cavity 122 is compressed, the pressure is increased, the elasticity of the water outlet spring 1C1 is overcome, the water outlet rubber head 1C is pushed to open the water outlet through hole 141 for draining, the isolation cavity 122 on the other side is pulled to be large, the pressure of the pulled isolation cavity 122 is reduced, the fluid in the water inlet channel 13 is convenient to overcome the elasticity of the water inlet spring 171, the water inlet rubber head 17 is pushed to open the water inlet through hole 131 for pumping, and when the motor 11 continuously rotates, the diaphragm pump can continuously form the action process of pumping and draining water.

In addition, when the working pressure of the water outlet channel 14 is too high, the pressure of the water outlet channel 14 overcomes the elastic force of the first spring 154, and pushes the sealing gasket 156 open, so that the excessive fluid enters the water inlet channel 13 through the backflow cavity 157 to form backflow protection, thereby ensuring accurate and stable spraying pressure.

The following is a second embodiment of a diaphragm pump with a backflow structure, which can solve the above technical problems, wherein in the present embodiment, the same reference numerals are used for the same structures as those in the first embodiment.

Referring to fig. 6, a second embodiment of a diaphragm pump with a backflow structure provided by the present invention is as follows:

a diaphragm pump having a return flow structure, comprising: the motor 11, the pump body 12, the eccentric wheel 19, the driving piece 18, the diaphragm 15, the water inlet rubber head 17, the water inlet spring 171, the water outlet rubber head 1C, the water outlet spring 1C1, the sealing gasket 156 and the elastic mechanism.

Referring to fig. 6, the elastic mechanism in the present embodiment includes a top cover 23, a first spring 154, a spring seat 26, a spring pad 24, and a first screw member 21.

Top cap 23 and pump body 12 fixed connection and formation set up the chamber, first spring 154, spring holder 26 and spring pad 24 all are located and set up the intracavity, and first spring 154 connects between spring pad 24 and spring holder 26, spring holder 26 and sealing gasket 156 contact, spring holder 26 can be spacing to first spring 154 formation, the bottom surface of spring holder 26 can form steady pressure to whole sealing gasket 156 simultaneously and admittedly, keep the accurate control to the backward flow, first screw member 21 and top cap 23 threaded connection, first screw member 21 one end extends to set up the intracavity and contacts with spring pad 24, make through the extrusion force of screwing up first screw member 21 adjustable to first spring 154.

Referring to fig. 6, the elastic mechanism further includes: a second spring 25, a second screw member 22, and a connection plate 27.

A first boss 261 is arranged on the spring seat 26, a second boss 262 is arranged on the first boss 261, one end of the first spring 154 is positioned and sleeved on the periphery of the first boss 261, the second spring 25 is positioned at the inner side of the first spring 154, and one end of the second spring 25 is positioned and sleeved on the periphery of the second boss 262;

the top cover 23 is provided with a containing cavity, the first screw rod 21 is located in the containing cavity, the connecting plate 27 is connected in the containing cavity, the second screw rod 22 is in threaded connection with the connecting plate 27, the first screw rod 21 and the spring pad 24 are provided with axial through holes, the second screw rod 22 is located in the through holes, one end of the second screw rod 22 is connected with the second spring 25, and extrusion force to the second spring 25 can be adjusted by screwing the second screw rod 22.

Through the integration setting second spring 25 for but cooperation adjusts the elasticity of first spring 154 and second spring 25 to sealing gasket 156, makes the regulation to back flow pressure more meticulous, adjusts more diversified, also can reduce spring aging fatigue simultaneously and cause the elasticity to sealing gasket 156 to change, and elasticity stability is stronger.

In this embodiment, the top cover 23 is provided with a fixing hole 233, the fixing hole 233 extends along the radial direction of the top cover 23, the connecting plate 27 is in a strip shape, two ends of the connecting plate 27 are respectively and fixedly connected in one fixing hole 233, the elastic mechanism further comprises a clamping piece, the clamping piece is clamped on the top cover 23 along the radial direction of the top cover 23, and two ends of the clamping piece are blocked at two ends of the fixing hole 233 to limit the connecting plate 27.

In order to facilitate the subsequent operation of the fastening member on the first screw member 21, the two sides of the top cover 23 are provided with the lug portions 231, and the fastening member is fastened above the lug portions 231.

Referring to fig. 7, in the present embodiment, the fastening member includes a cross rod 281 and a longitudinal rod 282, two longitudinal rods 282 are screwed on two ends of the cross rod 281, a first mating groove 211 is disposed on the first screw member 21, and a second mating groove 221 matching with the longitudinal rod 282 is disposed on the second screw member 22, so that the second screw member 22 can be twisted by the longitudinal rod 282 to rotate.

The side rail 282 includes a first operative position and a second operative position on the cross rail 281.

When the longitudinal bars 282 are in the first operating position, the longitudinal bars 282 are positioned at the ends of the cross bars 281, and two longitudinal bars 282 are used to restrain the connection plates 27, see fig. 6.

When the longitudinal bars 282 are in the second working position, the longitudinal bars 282 are spaced from the end of the cross bar 281 by a predetermined distance, and the two longitudinal bars 282 are aligned with one of the first mating grooves 211, respectively, such that the first screw member 21 can be twisted to rotate by the fastener, as shown in fig. 7.

In addition, referring to fig. 8, the two lateral sides of the connection plate 27 are provided with the avoidance grooves 271 opposite to the first screw member 21, when the first screw member 21 is twisted by the fastening member, the avoidance grooves 271 can reduce interference to the first fastening member, on the other hand, the top surface and the bottom of the connection plate 27 are provided with the reinforcement portions 272 near the avoidance grooves, so as to supplement the strength of the connection plate 27.

Wherein, one side intercommunication of fixed orifices 233 is provided with the mounting hole 232 with fixed orifices 233 intercommunication, and the mounting hole 232 is used for reinforcing portion 272 to penetrate to holding the intracavity, and mounting hole 232 is the through-hole, and fixed orifices 233 are the blind hole, and the vertical pole 282 card is in mounting hole 232 and with connecting plate 27 restriction in fixed orifices 233.

The fixing holes 233 on both sides of the top cover 23 are of a central symmetry structure, the connection plates 27 are inserted into the top cover 23 through the mounting holes 232, and then the two ends of the mounting plates 27 can be screwed into the corresponding fixing holes 233 by rotating the connection plates 27.

The groove depth of the middle position of the clearance groove 271 is gradually reduced towards two ends and is a semicircular groove, and the height of the middle position of the reinforcing part 272 is gradually reduced towards two ends and is in a triangular block shape.

In the invention, the pump body 12 comprises end covers 121 on both sides, an isolation cavity 122 is arranged between the end covers 121 and the membrane 15, two ends of a water outlet through hole 141 are respectively connected with one isolation cavity 122, a clamping block 16 is arranged in the water outlet through hole 141, a water outlet spring 1C1 is positioned between the clamping block 16 and a water outlet rubber head 1C, and a water inlet spring 171 is positioned between the end covers 121 and the water inlet rubber head 17.

After long-time use, the springs are easy to fatigue, the elastic force of the water inlet spring 171 on the water inlet rubber head 17 is weakened, the elastic force of the water outlet spring 1C1 on the water outlet rubber head 1C is weakened, the spraying pressure is unstable, even water leakage and the like are caused, and the diaphragm pump is relatively troublesome to disassemble and repair, and the cost is high.

Therefore, referring to fig. 9 and 10, in the present embodiment, the clamping block 16 is configured as a first split block 161 and a second split block 162, the first split block 161 and the second split block 162 are slidably disposed in the water outlet hole 141, the sliding extending track is consistent with the elastic direction of the water outlet spring 1C1, and one side of the first split block 161 away from the second split block 162 and one side of the second split block 162 away from the first split block 161 are respectively provided with the water outlet spring 1C1.

The diaphragm pump with reflux structure still includes adjustment subassembly 31, and adjustment subassembly 31 detachable sets up between first split piece 161 and second split piece 162 to extrude first split piece 161 and second split piece 162, adjust the pressure of fixture block 16 to water spring 1C1, and then adjust water spring 1C 1's elastic potential energy, improve the stability of business turn over water.

Specifically, referring to fig. 10, the adjusting assembly 31 includes a fixing portion 311, a fixing plate 313 and a movable plate 314, wherein the two fixing plates 313 are respectively connected to two sides of the fixing portion 311, the two fixing plates 313 are located on the same plane, a connecting column 315 is disposed on the fixing plate 313, and the plurality of movable plates 314 are detachably connected to the connecting column 315, so that different numbers of movable plates 314 can be adjusted to one of the fixing plates 313.

The fixed plate 313 and the movable plate 314 arranged on the fixed plate 313 are arranged between the first split block 161 and the second split block, so that the distance between the first split block 161 and the second split block 162 is adjusted, and meanwhile, different adjustment requirements on the elastic force of the water outlet spring 1C1 are met by adjusting different numbers of the movable plates 314.

The fixed plate 313 and the movable plate 314 are provided with magnetic attraction parts 316 for mutual magnetic attraction and fixation, and the magnetic attraction parts 316 are of annular structures, so that the adjusted adjacent movable plates 314 and the fixed plate 313 and the movable plates 314 can be stably and closely attached and connected.

Referring to fig. 9 and 10, two ends of the fixing portion 311 are provided with a slider 312, a chute 142 matched with the slider 312 is provided on an inner wall of the water outlet channel 14, and a slot 143 for clamping with the slider 312 is provided at one end of the chute 142 close to the clamping block 16.

Referring to fig. 11 and 12, an interface for matching with the adjusting component 31 is disposed between the first split block 161 and the second split block 162, and the first split block 161 and the second split block 162 are slidably disposed in the water outlet hole 141, so that the interface has a first movable position and a second movable position.

When the docking interface is in the first active position, the docking interface is opposite to the clamping slot 143.

When the interface is in the second active position, the interface is opposite to the chute 142.

The water outlet springs 1C1 on both sides of the clamping block 16 enable the abutting joint to be located at the first movable position, the edge, close to the clamping groove 143, of the abutting joint is provided with a guiding inclined plane 1621, and when the abutting joint is located at the first movable position, the guiding inclined plane 1621 is opposite to the sliding groove 142.

The adjusting component 31 can slide to the butt joint mouth through the spout, simultaneously fly leaf 314 is through the extrusion with direction inclined plane 1621 for first split piece 161 and second split piece 162 slide and keep away from each other, fly leaf 314 can slide gradually between first split piece 161 and second split piece 162, and when sliding in place, the water outlet spring 1C1 of fixture block 16 both sides makes the butt joint lie in first movable position, and then makes slider 312 slide into draw-in groove 143, forms automatic joint, accomplishes the adjustment to water outlet spring 1C1, convenient operation.

In addition, referring to fig. 9, an adjusting hole is provided on the end cover 121 opposite to the water inlet spring 171, an elastic sealing plate 32 is integrally injection molded in the adjusting hole, the sealing is stable, the water inlet spring 171 contacts with the inner side of the elastic sealing plate 32, threads are provided on the inner wall of the adjusting hole, an adjusting screw 33 is connected to one end of the adjusting hole near the outside, the adjusting screw 33 contacts with the outer side of the elastic sealing plate 32, and the elastic force of the water inlet spring 171 can be adjusted by screwing the adjusting screw 33, so that the operation is convenient.

The operation principle of the diaphragm pump in this embodiment is identical to that of the first embodiment, and will not be described here again.

The diaphragm pump with reflux structure of this preferred embodiment is through setting up backward flow chamber, sealing washer and elastic mechanism, backward flow chamber and inlet channel and with the outlet channel intercommunication, elastic mechanism is with sealing washer elasticity pressure-fastening in the backward flow intracavity for sealing washer elasticity separation inlet channel and outlet channel between the intercommunication, the strong driving force of motor can guarantee sufficient outlet pressure, and when outlet channel's operating pressure is too big, outlet channel's pressure just can push away sealing washer, makes unnecessary fluid enter into inlet channel through the backward flow chamber in, forms the backward flow protection, thereby guarantees to spray the accurate stability of pressure.

In summary, although the present invention has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is defined by the appended claims.

Claims

1. A diaphragm pump having a return flow structure, comprising: the device comprises a motor, a pump body, an eccentric wheel, a driving piece, a diaphragm, a water inlet rubber head, a water inlet spring, a water outlet rubber head, a water outlet spring, a sealing gasket and an elastic mechanism;

the pump body is provided with a backflow cavity which is communicated with the water inlet channel and the water outlet channel, and the sealing gasket is elastically pressed and fixed in the backflow cavity by the elastic mechanism, so that the sealing gasket elastically blocks the communication between the water inlet channel and the water outlet channel;

the pump body comprises end covers on two sides, an isolation cavity is arranged between the end covers and the membrane, two ends of the water outlet through hole are respectively connected with one isolation cavity, a clamping block is arranged in the water outlet through hole, the water outlet spring is positioned between the clamping block and the water outlet rubber head, and the water inlet spring is positioned between the end covers and the water inlet rubber head;

2. The diaphragm pump with a return flow structure according to claim 1, wherein the elastic mechanism includes a top cover, a first spring, a spring seat, a spring pad, and a first screw member;

3. The diaphragm pump with a return flow structure according to claim 2, wherein the elastic mechanism further comprises: a second spring, a second screw member, and a connection plate;

4. The diaphragm pump with a backflow structure according to claim 3, wherein a fixing hole is formed in the top cover, the fixing hole extends in the radial direction of the top cover, the connecting plates are long plates, two ends of each connecting plate are fixedly connected into one fixing hole, the elastic mechanism further comprises a clamping piece, the clamping piece is clamped on the top cover in the radial direction of the top cover, and two ends of the clamping piece are blocked at two ends of the fixing hole to limit the connecting plates.

5. The diaphragm pump with a backflow structure according to claim 4, wherein the clamping member comprises a cross rod and a longitudinal rod, the two longitudinal rods are connected to two ends of the cross rod in a threaded manner, a first mating groove is formed in the first screw rod, and a second mating groove matched with the longitudinal rod is formed in the second screw rod, so that the second screw rod can be twisted to rotate through the longitudinal rod;

6. The diaphragm pump with a backflow structure according to claim 5, wherein the two lateral sides of the connecting plate are provided with clearance grooves opposite to the first screw rod piece, the positions, close to the clearance grooves, on the top surface and the bottom of the connecting plate are provided with reinforcing parts, one side of the fixing hole is communicated with a mounting hole communicated with the fixing hole, the mounting hole is used for the reinforcing parts to penetrate into the accommodating cavity, the mounting hole is a through hole, the fixing hole is a blind hole, and the vertical rod is clamped in the mounting hole and limits the connecting plate in the fixing hole.

7. The diaphragm pump with a reflux structure according to claim 1, wherein the adjusting assembly comprises a fixing portion, fixing plates and movable plates, wherein two fixing plates are respectively connected to two sides of the fixing portion, the two fixing plates are located on the same plane, a connecting column is arranged on the fixing plates, and a plurality of movable plates are detachably connected with the connecting column, so that different numbers of movable plates can be adjusted to one of the fixing plates;

8. The diaphragm pump with the reflux structure according to claim 7, wherein the two ends of the fixing part are provided with sliding blocks, the inner wall of the water outlet channel is provided with sliding grooves matched with the sliding blocks, and one end, close to the clamping block, of each sliding groove is communicated with a clamping groove used for being clamped with the sliding blocks;

9. The diaphragm pump with the backflow structure according to claim 1, wherein an adjusting hole is formed in the end cover at a position opposite to the water inlet spring, an elastic sealing piece is integrally molded in the adjusting hole, the water inlet spring is in contact with the inner side of the elastic sealing piece, threads are formed on the inner wall of the adjusting hole, an adjusting screw is connected to one end, close to the outside, of the adjusting hole, and the adjusting screw is in contact with the outer side of the elastic sealing piece so as to be used for extrusion adjustment of the water inlet spring.