CN113757087A

CN113757087A - Diaphragm pump with backflow structure

Info

Publication number: CN113757087A
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: 2021-12-07
Anticipated expiration: 2041-09-07
Also published as: CN113757087B; CN116498531A; 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 pump body is provided with a water inlet pipe and a water outlet pipe; 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 channel, a movable water outlet rubber head is arranged between the isolation cavities and the water outlet channels, and the motor drives the diaphragm to move in a reciprocating mode through the driving piece. Be provided with the backward flow chamber on the pump body, backward flow chamber and inhalant canal and communicate with exhalant canal, elastic mechanism presses seal gasket elasticity admittedly in the backward flow intracavity for intercommunication between seal gasket elasticity separation inhalant canal and the exhalant canal, when exhalant canal's operating pressure was too big, the pressure of exhalant canal just can push away seal gasket, make unnecessary fluid enter into the inhalant canal through the backward flow chamber in, form backflow protection, thereby guarantee to spray accurate stability of pressure.

Description

Diaphragm pump with backflow 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, and is widely applied to the fields of agricultural production, industrial production and the like, for example, the diaphragm pump with a backflow structure is more and more widely applied in the fields of disinfection and spraying, pesticide spraying, water pumping and vehicle washing, garden equipment and the like in recent years, particularly, a large amount of disinfection and spraying equipment is born due to the appearance of novel coronavirus. 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 therefore desirable to provide a diaphragm pump having a backflow structure to solve the above technical problems.

Disclosure of Invention

The invention provides a diaphragm pump with a backflow structure, which aims to solve the problem that the spraying pressure of the diaphragm pump with the backflow structure in the prior art is unstable.

In order to solve the technical problems, the technical scheme of the invention is as follows: a diaphragm pump having a backflow 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 isolated cavities, the other two sides of the pump body are respectively provided with a water inlet channel and a water outlet channel, the isolated cavities are communicated with the water inlet channel through a water inlet through hole, the isolated cavities are communicated with the water outlet channel through a water outlet through hole, the water inlet rubber head is arranged in the water inlet through hole in an elastic isolation manner through the water inlet spring, the water outlet rubber head is arranged in the water outlet through hole in an elastic isolation manner through the water outlet spring, 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 is used for elastically pressing and fixing the sealing gasket in the backflow cavity, so that the sealing gasket is elastically separated from the water inlet channel and the water outlet channel to be communicated.

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

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 spring pad with between the spring holder, the spring holder with seal gasket contact, first screw member with top cap threaded connection, first screw member one end extends to set up the intracavity with the spring pad contact.

Wherein, the elastic mechanism further comprises: the second spring, the second screw rod and the connecting plate;

a first boss is arranged on the spring seat, a second boss is arranged on the first boss, one end of the first spring is positioned and sleeved on the periphery of the first boss, the second spring is positioned on 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;

be provided with on the top cap and hold the chamber, first screw rod spare is located hold the intracavity, the connecting plate is connected hold the intracavity, second screw rod spare with connecting plate threaded connection, first screw rod spare with all be provided with axial perforating hole on the spring mattress, second screw rod spare is located in the perforating hole and one end with second spring coupling.

Furthermore, the top cover is provided with a fixing hole, the fixing hole extends along the radial direction of the top cover, the connecting plate is a strip plate, two ends of the connecting plate are respectively and fixedly connected in one fixing hole, the elastic mechanism further comprises a clamping piece, the clamping piece is clamped on the top cover along the radial direction of the top cover, and two ends of the clamping piece block two ends of the fixing hole to limit the connecting plate.

Furthermore, the clamping piece comprises a cross rod and longitudinal rods, 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 piece, and a second matching groove matched with the longitudinal rods is formed in the second screw rod piece, so that the second screw rod piece can be twisted to rotate through the longitudinal rods;

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

when the longitudinal rods are located at the first working position, the longitudinal rods are located at the end parts of the transverse rods, and the two longitudinal rods are used for limiting the connecting plate;

when the longitudinal rods are located at the second working position, a set distance is reserved between the longitudinal rods and the end portions of the transverse rods, and the two longitudinal rods are respectively aligned with the first matching groove, 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 first screw rod spare is relative keeps away the position groove, the top surface of connecting plate and the position that is close to on the bottom keep away the position groove all are provided with the rib, one side intercommunication of fixed orifices be provided with the mounting hole of fixed orifices intercommunication, the mounting hole is used for the rib penetrates to hold the intracavity, the mounting hole is the through-hole, the fixed orifices is the blind hole, the vertical pole card in the mounting hole and with 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 cover and the diaphragm, two ends of the water outlet through hole are respectively connected with one isolation cavity, a fixture block is arranged in the water outlet through hole, the water outlet spring is positioned and arranged between the fixture block and the water outlet rubber head, and the water inlet spring is positioned and arranged between the end cover 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, the sliding extending track is consistent with the elastic force 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 the water outlet spring, the diaphragm pump with the backflow structure further comprises an adjusting assembly, and the adjusting assembly 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 as to adjust the elastic potential energy of the water outlet spring.

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

the fixing plate and the movable plate on the fixing plate are arranged between the first split block and the second split block so as to adjust the distance between the first split block and the second split block;

magnetic parts for mutually magnetically attracting and fixing are arranged on the first fixing plate, the second fixing plate and the movable plate, and the magnetic parts are of annular structures.

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

a butt joint port used for being matched with the adjusting assembly 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 mode, so that the butt joint port has a first movable position and a second movable position;

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

when the butt joint port is located at the second movable position, the butt joint port is opposite to the sliding chute;

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

In addition, on the end cover with it is provided with the regulation hole to intake spring relative position the elastic sealing piece of integrative moulding plastics in the regulation hole, intake 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 the outside is connected with adjusting screw, adjusting screw with the outside contact of elastic sealing piece is used for the extrusion to adjust intake spring.

Compared with the prior art, the invention has the beneficial effects that: the diaphragm pump with the backflow structure is provided with the backflow cavity, the sealing gasket and the elastic mechanism, the backflow cavity is communicated with the water inlet channel and the water outlet channel, the elastic mechanism elastically presses and fixes the sealing gasket in the backflow cavity, so that the sealing gasket elastically obstructs the communication between the water inlet channel and the water outlet channel, the strong driving force of the motor can ensure the sufficient water outlet pressure, when the working pressure of the water outlet channel is overlarge, the pressure of the water outlet channel can push the sealing gasket away, redundant fluid enters the water inlet channel through the backflow cavity, backflow protection is formed, and the spraying pressure is ensured to be accurate and stable.

Drawings

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

Fig. 1 is a front view of a diaphragm pump having a backflow structure according to the present invention.

Fig. 2 is a right side view of a diaphragm pump having a backflow structure according to the present invention.

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

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

Fig. 5 is an exploded view illustrating a diaphragm pump having a backflow structure according to the present invention.

Fig. 6 is a schematic structural view illustrating a second spring and a second screw member provided in the diaphragm pump having a backflow structure according to the present invention.

Fig. 7 is a schematic structural view illustrating a fastening member of the diaphragm pump having a backflow structure according to the present invention being engaged with a first screw member.

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

Fig. 9 is a schematic view of the diaphragm pump setting adjustment assembly having a backflow structure according to the present invention.

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

Fig. 11 is a schematic view of the adjustment assembly of the diaphragm pump having a backflow structure according to the present invention when it is not inserted into the docking port.

Fig. 12 is a schematic view illustrating a configuration of an adjustment assembly of a diaphragm pump having a backflow structure according to the present invention when being inserted into a docking port.

Fig. 13 is a schematic view of a fixing hole and a mounting hole of an inner side of a top cover of a diaphragm pump having a backflow structure according to the present invention.

FIG. 14 is a schematic view of the longitudinal rod being clamped in the mounting hole and the connecting plate being restrained in the fixing hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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.

The following is a first embodiment of a diaphragm pump having a backflow structure according to the present invention that can solve the above technical problems.

In the drawings, elements having similar structures are denoted by the same reference numerals.

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

The both sides of the pump body 12 are kept apart through diaphragm 15 respectively and are formed isolation chamber 122, the other both sides are provided with inhalant canal 13 and exhalant canal 14 respectively, keep apart chamber 122 and inhalant canal 13 and pass through inhalant canal 131 intercommunication, keep apart chamber 122 and exhalant canal 14 and pass through exhalant canal 141 intercommunication, the head 17 is glued through intaking spring 171 elastic separation and sets up in inhalant canal 131, it sets up in exhalant canal 141 through exhalant canal 1C1 elastic separation to go out glue head 1C, eccentric wheel 19 connects between driving piece 18 and motor 11, a diaphragm pump 15 is connected respectively to the both sides of driving piece 18, thereby keep apart two isolation chamber 122, make can produce large-traffic, big injection pressure.

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

One side of the output shaft of the motor 11 is connected with a support 1B, 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.

Between head 17 and the diaphragm 15 are glued in the intaking, and go out between water glue head 1C and the diaphragm 15, all can set up sleeve 1D, carry out low-cost change after convenient ageing, wearing and tearing.

Wherein, the outer sides of the water inlet channel 13 and the water outlet channel 14 can be provided with threads, so that the connection between the water inlet channel and the external pipeline is reliable and stable, and water leakage can not occur after long-time work.

The eccentric wheel 19 can be made of powder metallurgy materials, 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 obstructs 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 151.

The top cover 152 and the pump body 12 are fixedly connected and form a setting cavity, the first spring 154, the spring seat 155 and the spring pad 153 are all located in the setting cavity, the first spring 154 is connected between the spring pad 153 and the spring seat 155, the spring seat 155 is in contact with the sealing gasket 156, the spring seat 155 can limit the first spring 154, meanwhile, the bottom surface of the spring seat 155 can stably press and fix the whole sealing gasket 156, accurate control of backflow is kept, the first screw member 151 is in threaded connection with the top cover 152, one end of the first screw member 151 extends to the setting cavity to be in contact with the spring pad 153, and therefore extrusion force of the first screw member 151 on the first spring 154 can be adjusted by screwing.

As shown in fig. 5, the top cover 152 and the pump body 12, and the end cover 121 and the pump body 12 can be fixedly connected by screws.

When the diaphragm pump of this embodiment works, the motor 11 drives the eccentric wheel 19 to rotate, so as to drive the driving member 18 to perform reciprocating vibration left and right, 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 can be compressed, the pressure of the fluid in the isolation cavity 122 is increased after being compressed, the elastic force of the water outlet spring 1C1 can be 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 can be pulled up, the pressure of the pulled up isolation cavity 122 is reduced, the fluid in the water inlet channel 13 can overcome the elastic force of the water inlet spring 171 conveniently, the water inlet rubber head 17 is pushed to open the water inlet through hole 131 for pumping, when the motor 11 continuously rotates, the diaphragm pump can continuously form the action process of pumping water and draining.

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 away the sealing gasket 156, so that the redundant fluid enters the water inlet channel 13 through the backflow cavity 157 to form backflow protection, thereby ensuring accurate and stable spraying pressure.

The second embodiment of the diaphragm pump having a backflow structure according to the present invention is as follows, wherein the same reference numerals are used for the same structures as those in the first embodiment in this embodiment.

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

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

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

Top cap 23 and the pump body 12 fixed connection just form and 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 the contact of seal gasket 156, spring holder 26 can form spacingly to first spring 154, the bottom surface of spring holder 26 can form stable the solid pressure to whole seal gasket 156 simultaneously, 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 and sets up the intracavity and contact with spring pad 24, make through screwing up the adjustable extrusion force to first spring 154 of first screw member 21.

Referring to fig. 6, the elastic mechanism further includes: a second spring 25, a second screw member 22, and a connecting 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 on 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;

be provided with on the top cap 23 and hold the chamber, first screw member 21 is located and holds the intracavity, and connecting plate 27 is connected and is holding the intracavity, and second screw member 22 and connecting plate 27 threaded connection all are provided with axial perforating hole on first screw member 21 and the spring pad 24, and second screw member 22 is located the perforating hole and one end is connected with second spring 25, through revolving the adjustable extrusion force to second spring 25 of second screw member 22.

Through the integrated second spring 25 that sets up for can cooperate and adjust first spring 154 and second spring 25 to seal gasket 156's elasticity, make the regulation to reflux pressure more meticulous, adjust more diversified, also can reduce simultaneously that the ageing fatigue of spring causes the elasticity change to seal gasket 156, 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 includes a clamping member, the clamping member is clamped on the top cover 23 along the radial direction of the top cover 23, and two ends of the clamping member block two ends of the fixing hole 233 to limit the connecting plate 27.

It should be noted that, in order to facilitate the operation of the first screw member 21 by the subsequent fastener, lug parts 231 are provided at both sides of the top cover 23, and the fastener is fastened above the lug parts 231.

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

The longitudinal bar 282 includes a first operating position and a second operating position on the cross bar 281.

When the longitudinal rod 282 is located at the first working position, the longitudinal rod 282 is located at the end of the cross rod 281, and the two longitudinal rods 282 are used for limiting the connecting plate 27, as can be seen in fig. 6.

When the vertical rods 282 are located at the second working position, a set distance is left between the vertical rods 282 and the end of the cross rod 281, and the two vertical rods 282 are aligned with one of the first matching grooves 211, so that the first screw member 21 can be twisted by the fastener to rotate, as shown in fig. 7.

In addition, referring to fig. 8, the connecting plate 27 is provided with two avoiding grooves 271 opposite to the first screw member 21 at two lateral sides, when the first screw member 21 is twisted by the fastener, the avoiding grooves 271 can reduce interference with the first fastener, and on the other hand, the top surface and the bottom of the connecting plate 27 are provided with reinforcing portions 272 at positions close to the avoiding grooves to supplement the strength of the connecting plate 27.

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

The fixing holes 233 at both sides of the top cover 23 are of a central symmetrical structure, and the connecting plate 27 is inserted into the top cover 23 through the mounting holes 232, and then the connecting plate 27 is rotated, so that both ends of the mounting plate 27 can be screwed into the corresponding fixing holes 233.

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

In the present invention, the pump body 12 includes end caps 121 on both sides, an isolation cavity 122 is provided between the end cap 121 and the diaphragm 15, two ends of the water outlet through hole 141 are respectively connected to one isolation cavity 122, a fixture block 16 is provided in the water outlet through hole 141, the water outlet spring 1C1 is positioned between the fixture block 16 and the water outlet rubber head 1C, and the water inlet spring 171 is positioned between the end cap 121 and the water inlet rubber head 17.

After long-time use, the spring is 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 1C on the water outlet rubber head 1C is weakened, so that the problems of unstable injection pressure, water leakage and the like are caused, and the diaphragm pump is troublesome to disassemble and maintain and high in cost.

Therefore, referring to fig. 9 and 10, in the present embodiment, the latch 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 through hole 141, the sliding extending track is consistent with the elastic force direction of the water outlet spring 1C1, and one water outlet spring 1C1 is respectively disposed on the side of the first split block 161 away from the second split block 162 and the side of the second split block 162 away from the first split block 161.

The diaphragm pump with the backflow structure further comprises an adjusting assembly 31, wherein the adjusting assembly 31 is detachably arranged between the first split block 161 and the second split block 162 to press the first split block 161 and the second split block 162, the pressure of the fixture block 16 on the water outlet spring 1C1 is adjusted, the elastic potential energy of the water outlet spring 1C1 is adjusted, and the stability of water inlet and outlet is improved.

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

The fixing plate 313 and the movable plates 314 on the fixing plate 313 are disposed between the first and second body blocks 161 and 162, so that the distance between the first and second body blocks 161 and 162 can be adjusted, and different adjustment requirements for the elastic force of the outlet spring 1C1 can be satisfied by adjusting different numbers of the movable plates 314.

The first fixed plate 313, the second fixed plate 313 and the movable plate 314 are respectively provided with a magnetic part 316 for magnetically attracting and fixing each other, and the magnetic parts 316 are annular structures, so that the adjusted adjacent movable plates 314 and the fixed plate 313 and the movable plates 314 can be stably and tightly attached and connected.

Referring to fig. 9 and 10, two ends of the fixing portion 311 are provided with sliders 312, a sliding slot 142 matching with the sliders 312 is disposed on an inner wall of the water outlet channel 14, and one end of the sliding slot 142 close to the fixture block 16 is communicated with a clamping slot 143 for clamping with the sliders 312.

Referring to fig. 11 and 12, a docking port for mating with the adjustment assembly 31 is disposed between the first and second split blocks 161 and 162, and the first and second split blocks 161 and 162 are slidably disposed in the water outlet hole 141 such that the docking port has a first movable position and a second movable position.

When the docking port is in the first active position, the docking port is opposite to the card slot 143.

When the docking port is in the second active position, the docking port is opposite the chute 142.

The outlet springs 1C1 on the two sides of the latch 16 make the docking port located at the first movable position, a guiding inclined surface 1621 is provided on the edge of the docking port close to the latch groove 143, and when the docking port is located at the first movable position, the guiding inclined surface 1621 is opposite to the chute 142.

The adjusting assembly 31 can slide to the docking port through the sliding groove, and meanwhile, the movable plate 314 is extruded by the guide inclined surface 1621, so that the first split block 161 and the second split block 162 slide away from each other, the movable plate 314 can gradually slide between the first split block 161 and the second split block 162, and when the movable plate slides in place, the water outlet springs 1C1 on the two sides of the fixture block 16 enable the docking port to be located at the first movable position, and further the slide block 312 slides into the fixture groove 143, so that automatic clamping is formed, adjustment of the water outlet springs 1C1 is completed, and the operation is convenient.

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

The working principle of the diaphragm pump of this embodiment is the same as that of the first embodiment, and will not be described herein.

This diaphragm pump with backward flow structure of preferred embodiment is through setting up the backward flow chamber, seal gasket and elastic mechanism, backward flow chamber and inhalant canal, and communicate with exhalant canal, elastic mechanism presses seal gasket elasticity admittedly in the backward flow intracavity, make the intercommunication between seal gasket elasticity separation inhalant canal and the exhalant canal, sufficient water pressure can be guaranteed to the stronger drive power of motor, and when the operating pressure of exhalant canal was too big, the pressure of exhalant canal just can push away seal gasket, make unnecessary fluid enter into the inhalant canal through the backward flow chamber in, form backflow protection, thereby guarantee to spray accurate stability of pressure.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A diaphragm pump having a backflow 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;

2. The diaphragm pump with a backflow 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 having a backflow structure according to claim 2, wherein the elastic mechanism further includes: the second spring, the second screw rod and the connecting plate;

4. The diaphragm pump with a backflow structure according to claim 3, wherein the top cover is provided with fixing holes extending in a radial direction of the top cover, the connecting plate is a strip plate, two ends of the connecting plate are fixedly connected in one of the fixing holes, respectively, and the elastic mechanism further includes a locking member that is locked to the top cover in the radial direction of the top cover, and two ends of the locking member are blocked at two ends of the fixing holes to restrain the connecting plate.

5. The diaphragm pump having a backflow structure according to claim 4, wherein the fastener includes a cross bar and a longitudinal bar, the two longitudinal bars are threaded on both ends of the cross bar, a first mating groove is provided on the first screw member, and a second mating groove matching with the longitudinal bar is provided on the second screw member, so that the second screw member can be twisted to rotate by the longitudinal bar;

6. The diaphragm pump with a backflow structure according to claim 4, wherein the connecting plate is provided with a space avoiding groove opposite to the first screw member on both lateral sides thereof, the connecting plate is provided with a reinforcing portion on both the top surface and the bottom portion thereof near the space avoiding groove, 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 portion 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 backflow structure according to claim 1, wherein the pump body includes end caps at two sides, an isolation cavity is formed between the end cap and the diaphragm, two ends of the water outlet through hole are respectively connected with one isolation cavity, a fixture block is arranged in the water outlet through hole, the water outlet spring is positioned and arranged between the fixture block and the water outlet rubber head, and the water inlet spring is positioned and arranged between the end cap and the water inlet rubber head;

8. The diaphragm pump with a backflow structure according to claim 7, wherein the adjustment assembly comprises a fixed portion, a fixed plate and a movable plate, two of the fixed plates are respectively connected to two sides of the fixed portion, and the two fixed plates are located on the same plane, the fixed plate is provided with a connection column, and a plurality of the movable plates are detachably connected to the connection column, so that different numbers of the movable plates can be adjusted to one of the fixed plates;

9. The diaphragm pump with the backflow structure according to claim 8, wherein two ends of the fixing portion are provided with sliding blocks, a sliding groove matched with the sliding blocks is formed in the inner wall of the water outlet channel, and a clamping groove used for being clamped with the sliding blocks is formed in one end, close to the clamping block, of the sliding groove in a communicated mode;

10. The diaphragm pump with a backflow structure according to claim 7, wherein an adjusting hole is formed in the end cover opposite to the water inlet spring, an elastic sealing sheet is integrally molded in the adjusting hole, the water inlet spring contacts with the inner side of the elastic sealing sheet, threads are arranged on the inner wall of the adjusting hole, one end of the adjusting hole, which is close to the outside, is connected with an adjusting screw, and the adjusting screw contacts with the outer side of the elastic sealing sheet to squeeze and adjust the water inlet spring.