CN217682204U - Diaphragm pump - Google Patents

Abstract

The utility model discloses a diaphragm pump belongs to the diaphragm pump field. The utility model discloses a connecting screw closely presses the interval structure between the outside edge of working chamber cell body and the working chamber cell body on the diaphragm with the intermediate part and diaphragm and the diaphragm chamber fastening connection of diaphragm support, forms each sealed working chamber. Even under the pressure action of the working cavity, the middle part of the diaphragm support can not deform downwards, the sealing property, the durability and the deformation resistance of the working cavity of the diaphragm pump are greatly improved on the premise of not changing the material of the diaphragm support, the strength of parts in the working process is greatly increased, the parts are not easy to deform, the pressure loss of the working cavity can not be caused, the mutual communication and leakage of the working cavities can not be caused, and the working efficiency of the diaphragm pump can not be reduced; the diaphragm support has enough strength even if being made of plastics, and the production cost and the process difficulty are reduced.

Description

Diaphragm pump

Technical Field

The utility model relates to a diaphragm pump field especially indicates a diaphragm pump.

Background

The diaphragm pump relies on the volume of making a round trip to swell and change the working chamber to inhale and discharge liquid, and the diaphragm chamber below of prior art's diaphragm pump sets up the diaphragm, and the diaphragm below sets up the diaphragm support, forms the working chamber between diaphragm chamber and the diaphragm. The motor is connected with the diaphragm through the eccentric swinging mechanism, and the diaphragm is driven by the motor and the eccentric swinging mechanism to swing back and forth, so that the volume of the working cavity is periodically changed. When the volume of the working cavity is increased, the working cavity is at low pressure, and the working cavity sucks liquid from the water inlet cavity; when the volume of the working cavity is reduced, the working cavity is high-pressure, and the working cavity discharges liquid into the water outlet cavity, so that unidirectional pumping of the liquid is realized. The number of diaphragm pump working chamber is a plurality of, and a plurality of working chambers work independently respectively, and the operating condition at same time of each working chamber is different, and some working chambers are high pressure, and some are low pressure at the same time.

In order to ensure the normal work of the working cavity and prevent the pressure loss of the working cavity, the working cavity needs to be sealed. Moreover, in order to prevent the different pressure states of the working chambers from affecting each other, the working chambers also need to be sealed and isolated from each other. In the prior art, a diaphragm chamber and a diaphragm support are mutually in extrusion fit, so that a spacing structure between a plurality of working cavities at the bottom of the diaphragm chamber is extruded on a diaphragm, and the working cavities are mutually sealed and isolated.

The prior art manner of squeeze sealing of the diaphragm chamber and the diaphragm support results in poor sealing, durability and deformation resistance of the working chamber of the diaphragm pump: the diaphragm is sealed by the diaphragm chamber and the diaphragm support in a pressing fit mode, when the diaphragm pump works, the liquid pressure in the working cavity is high, and after the diaphragm pump works for a period of time, the diaphragm support is easy to deform under the pressure of the working cavity. After the diaphragm support deforms, the position of the diaphragm which is originally squeezed and sealed by the diaphragm chamber cannot be sealed, namely, the position of the diaphragm squeezed and sealed by the diaphragm chamber is loosened or a gap appears, and then the working cavity cannot be effectively sealed.

The failure of effective sealing of the working cavity can not only cause pressure loss of the working cavity, but also reduce the working efficiency of the diaphragm pump; and the gap between diaphragm and the diaphragm chamber can cause each working chamber to communicate and leak, and when each working chamber communicates and leaks, the pressures of different states of each working chamber can be mutually neutralized and balanced, so that the pressure of the high-pressure working chamber is reduced, the pressure of the low-pressure working chamber is increased, and the working efficiency of the diaphragm pump is reduced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a diaphragm pump, the utility model provides high leakproofness, durability and the anti deformability of diaphragm pump working chamber, work efficiency can not reduce after diaphragm pump work a period.

The utility model provides a technical scheme as follows:

a diaphragm pump comprising a motor, an eccentric, a wobble frame, a diaphragm support, a diaphragm chamber, a fluid chamber, and a connection screw, wherein:

the fluid chamber is provided with a water inlet channel and a water outlet channel, the lower part of the fluid chamber is provided with a diaphragm chamber mounting groove which is opened downwards, the diaphragm chamber is mounted in the diaphragm chamber mounting groove from the lower part, and a space between the fluid chamber and the diaphragm chamber forms a water inlet cavity and a water outlet cavity; the water inlet cavity and the water outlet cavity are sealed and isolated through an isolation structure, the water inlet channel is communicated with the water inlet cavity, and the water outlet channel is communicated with the water outlet cavity;

the diaphragm is arranged below the diaphragm chamber, and a working cavity is formed by the space between one working cavity groove body and the diaphragm; each working cavity is communicated with the water inlet cavity and the water outlet cavity through a water inlet hole and a water outlet hole respectively, and a water inlet check valve and a water outlet check valve are arranged on the water inlet hole and the water outlet hole respectively;

the diaphragm support is arranged below the diaphragm, the connecting screw fixes the center of the diaphragm chamber and the center of the diaphragm to the diaphragm support, and the diaphragm support is fixedly connected to the bottom of the fluid chamber;

the diaphragm support is provided with a swing frame through hole, the top of the swing frame penetrates through the swing frame through hole to be connected with the diaphragm, the eccentric wheel is arranged on an output shaft of the motor, and the eccentric wheel is matched with the bottom of the swing frame through a bearing.

Furthermore, the diaphragm chamber mounting groove comprises a water inlet cavity groove body and a water outlet cavity groove body, the water outlet cavity groove body is positioned in the middle of the diaphragm chamber mounting groove, the water inlet cavity groove body is positioned around the water outlet cavity groove body, the water inlet channel is communicated with the water inlet cavity groove body through a water inlet, and the water outlet channel is communicated with the water outlet cavity groove body through a water outlet;

the upper part of the diaphragm chamber comprises a water inlet cavity groove body corresponding part and a water outlet cavity groove body corresponding part, the water outlet cavity groove body corresponding part is positioned in the middle of the upper part of the diaphragm chamber, the water inlet cavity groove body corresponding part is positioned around the water outlet cavity groove body corresponding part, the water inlet hole is positioned on the water inlet cavity groove body corresponding part, and the water outlet hole is positioned on the water outlet cavity groove body corresponding part;

the water inlet cavity groove body is matched with the corresponding part of the water inlet cavity groove body to form the water inlet cavity; the water outlet cavity groove body is matched with the corresponding part of the water outlet cavity groove body to form the water outlet cavity.

Furthermore, the isolation structure comprises a first annular partition plate and a second annular partition plate, the first annular partition plate is arranged in the diaphragm chamber mounting groove and is positioned between the water inlet cavity groove body and the water outlet cavity groove body, and the second annular partition plate is arranged at the upper part of the diaphragm chamber and is positioned between the corresponding part of the water inlet cavity groove body and the corresponding part of the water outlet cavity groove body;

the bottom of the first annular partition plate is provided with a seal ring groove, a seal ring is arranged in the seal ring groove, and the top of the second annular partition plate is inserted into the seal ring groove and tightly props against the seal ring to hermetically isolate the water inlet cavity from the water outlet cavity.

Furthermore, a gasket is arranged on the top surface of the diaphragm in each working cavity, the gasket is of a circular sheet structure, a first assembling structure is arranged in the middle of the lower surface of the gasket, a second assembling structure is arranged on the upper surface of the diaphragm, and the first assembling structure of the gasket is matched with the second assembling structure of the diaphragm;

the gasket is fixedly connected to the top of the swing frame after passing through the gasket and the diaphragm downwards from the top of the gasket through a diaphragm connecting screw;

arc chamfer is carried out on the outward flange of gasket bottom level and smooth, the diaphragm is in be provided with around the gasket and be used for the convenience the annular concave part of diaphragm deformation.

Furthermore, a swinging head is arranged at the top of the swinging frame, the top end surface of the swinging head is circular, the diaphragm is connected with the top end of the swinging head through a screw, a bearing groove is formed in the bottom of the swinging frame, an inner ring of the bearing is sleeved on the eccentric wheel, and an outer ring of the bearing is located in the bearing groove.

Furthermore, the quantity of working chamber cell body, gasket and swing head is 4, and 4 working chamber cell bodies are in the center outside of diaphragm chamber is according to the mode evenly distributed of square arrangement, and the interval structure between 4 working chamber cell bodies is the space bar.

Furthermore, the water inlet one-way valve comprises a water inlet soft valve plate, the water outlet one-way valve comprises a water outlet soft valve plate, and the water inlet soft valve plate and the water outlet soft valve plate both comprise a conical joint part and a sheet-shaped sealing part;

the water inlet soft valve sheet is positioned in the working cavity, the conical joint part of the water inlet soft valve sheet is connected with the diaphragm chamber at the water inlet, and the sheet sealing part of the water inlet soft valve sheet is attached to the bottom end of the water inlet; the water outlet soft valve block is positioned in the water outlet cavity, the conical joint part of the water outlet soft valve block is connected with the diaphragm chamber at the water outlet, and the sheet sealing part of the water outlet soft valve block is attached to the top end of the water outlet.

Furthermore, the water inlet one-way valve comprises a water inlet valve core, a water inlet spring and a water inlet spring seat, wherein the water inlet valve core, the water inlet spring and the water inlet spring seat are sequentially arranged in the water inlet hole from top to bottom; the water inlet spring seat is connected with the water inlet hole, the water inlet valve core is subjected to upward elastic force of the water inlet spring, so that the water inlet valve core is tightly propped against the upper end of the water inlet hole, and the water inlet spring seat is provided with a water through hole of the water inlet spring seat;

the water outlet one-way valve comprises a water outlet valve core, a water outlet spring and a water outlet spring seat, and the water outlet valve core, the water outlet spring and the water outlet spring seat are sequentially arranged in the water outlet hole from bottom to top; the water outlet spring seat is connected with the water outlet hole, the water outlet valve core is subjected to downward elastic force of the water outlet spring, so that the water outlet valve core is tightly propped against the lower end of the water outlet hole, and a water through hole of the water outlet spring seat is formed in the water outlet spring seat.

Further, the water inlet spring seat and the water inlet hole are connected together in an interference fit manner; the water outlet spring seat is connected with the water outlet hole in an interference fit mode, an assembly column is arranged in the diaphragm chamber mounting groove, and the assembly column is propped against the top end face of the water outlet spring seat from the upper side.

Further, the diaphragm pump still includes the voltage limiting power-off device, the voltage limiting power-off device includes the open first pressure limiting chamber in upper end, first pressure limiting chamber bottom through first high-pressure port with go out the water cavity intercommunication, first pressure limiting chamber top is provided with first decompression cushion, first decompression cushion top is provided with first spring housing, the cover has first decompression ring around the first spring housing, be provided with first pressure regulating spring in the first spring housing, first pressure regulating spring top is provided with first spring holder, first spring holder top is provided with first pressure regulating screw, the top of first spring housing is provided with micro-gap switch to micro-gap switch's contact is located the top of the top flange of first spring housing.

Furthermore, the diaphragm pump also comprises a pressure-limiting backflow device, the pressure-limiting backflow device comprises a second pressure-limiting cavity with an open upper end, the bottom of the second pressure-limiting cavity is communicated with the water outlet cavity through a second high-pressure hole, a backflow cavity with an open upper end is arranged around the second pressure-limiting cavity, the backflow cavity is communicated with the water inlet channel through a backflow hole, and a cavity partition plate is arranged between the second pressure-limiting cavity and the backflow cavity; second pressure limiting cavity and backward flow chamber top are provided with second decompression cushion, second decompression cushion top is provided with the second spring housing, the cover has the second pressure reduction circle around the second spring housing, be provided with second pressure regulating spring in the second spring housing, second pressure regulating spring top is provided with the second spring holder, second spring holder top is provided with second pressure regulating screw.

The utility model discloses following beneficial effect has:

the utility model discloses a connecting screw closely presses the interval structure between the outside edge of working chamber cell body and the working chamber cell body on the diaphragm with the intermediate part and diaphragm and the diaphragm chamber fastening connection of diaphragm support, forms each sealed working chamber. Even under the pressure action of the working cavity, the middle part of the diaphragm support can not deform downwards, the sealing property, the durability and the deformation resistance of the working cavity of the diaphragm pump are greatly improved on the premise of not changing the material of the diaphragm support, the strength of parts in the working process is greatly increased, the parts are not easy to deform, the pressure loss of the working cavity can not be caused, the mutual communication and leakage of the working cavities can not be caused, and the working efficiency of the diaphragm pump can not be reduced; the diaphragm support has enough strength even if being made of plastics, and the production cost and the process difficulty are reduced.

Drawings

Fig. 1 is an exploded view of a diaphragm pump of example 1 viewed from one direction;

fig. 2 is an exploded view of the diaphragm pump of example 1 viewed from another direction;

fig. 3 is a front view of the diaphragm pump of embodiment 1;

FIG. 4 is a plan view of the diaphragm pump according to embodiment 1;

FIG. 5 is a cross-sectional view taken along line C-C of FIG. 4;

FIG. 6 is a sectional view taken along line B-B of FIG. 4 (motor structure is omitted);

fig. 7 is a perspective view of a fluid chamber of the diaphragm pump of embodiment 1 viewed from one direction;

fig. 8 is a perspective view of a fluid chamber of the diaphragm pump of embodiment 1 viewed from another direction;

FIG. 9 is a plan view of a fluid chamber of the diaphragm pump of embodiment 1;

FIG. 10 isbase:Sub>A sectional view taken along line A-A of FIG. 9;

fig. 11 is a bottom view of the fluid chamber of the diaphragm pump of embodiment 1;

fig. 12 is a perspective view of a diaphragm chamber of the diaphragm pump of embodiment 1 as seen from one direction;

fig. 13 is a perspective view of a diaphragm chamber of the diaphragm pump of embodiment 1 viewed from another direction;

fig. 14 is a perspective view of a diaphragm of the diaphragm pump of embodiment 1;

fig. 15 is a perspective view of a diaphragm holder of the diaphragm pump of embodiment 1;

fig. 16 is a perspective view of a swing frame of the diaphragm pump of embodiment 1;

fig. 17 is a perspective view of the diaphragm chamber, the diaphragm holder, the swing frame, and the integrated structure of the combination of the inlet check valve and the outlet check valve of the diaphragm pump according to embodiment 1, viewed from one direction;

fig. 18 is a perspective view of the diaphragm chamber, the diaphragm holder, the swing frame, and the integrated structure of the combination of the inlet check valve and the outlet check valve of the diaphragm pump according to embodiment 1, viewed from another direction;

fig. 19 is a top view of the overall structure of the diaphragm chamber, diaphragm support, swing frame, and inlet and outlet check valves of the diaphragm pump of embodiment 1 in combination;

FIG. 20 is a sectional view taken along line E-E of FIG. 19;

fig. 21 is a perspective view of a motor holder of the diaphragm pump of embodiment 1;

fig. 22 is an exploded view of a pressure limiting power cutoff device of a diaphragm pump of embodiment 1;

fig. 23 is a perspective view of the overall structure of the diaphragm chamber, the diaphragm holder, the swing frame, and the inlet check valve and the outlet check valve of the diaphragm pump of embodiment 2;

fig. 24 is a top view of the overall structure of the diaphragm chamber, diaphragm support, swing frame, and inlet and outlet check valves of the diaphragm pump of embodiment 2 in combination;

FIG. 25 is a sectional view taken along line F-F of FIG. 24;

FIG. 26 is a plan view of a diaphragm pump according to embodiment 3;

fig. 27 is a front view of the diaphragm pump of embodiment 3;

FIG. 28 is a sectional view taken along line D-D of FIG. 27 (motor structure is omitted);

fig. 29 is a top view of a fluid chamber of a diaphragm pump of embodiment 3;

fig. 30 is a sectional view taken along line G-G of fig. 29.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

Example 1:

the embodiment of the utility model provides a diaphragm pump, as shown in fig. 1-22, including motor 1, eccentric wheel 2, swing span 3, diaphragm support 4, diaphragm 5, diaphragm chamber 6, fluid chamber 7 and connecting screw 8, wherein:

a water inlet channel 9 and a water outlet channel 10 are arranged on the fluid chamber 7, a diaphragm chamber mounting groove 11 with a downward opening is formed in the lower portion of the fluid chamber 7, the water inlet channel 9 and the water outlet channel 10 are positioned above the diaphragm chamber mounting groove 11, the diaphragm chamber 6 is mounted in the diaphragm chamber mounting groove 11 from the lower portion, and a water inlet cavity 12 and a water outlet cavity 13 are formed in the space between the fluid chamber 7 and the diaphragm chamber 8; the water inlet cavity 12 and the water outlet cavity 13 are sealed and isolated by an isolation structure 14, the water inlet channel 9 is communicated with the water inlet cavity 12, and the water outlet channel 10 is communicated with the water outlet cavity 13.

The lower part of the diaphragm chamber 6 is provided with a plurality of working cavity groove bodies 15 which are opened downwards, a spacing structure 16 is arranged between the adjacent working cavity groove bodies 15, the diaphragm 5 is arranged below the diaphragm chamber 6, and a working cavity 17 is formed in the space between one working cavity groove body 15 and the diaphragm 5; each working cavity 17 is respectively communicated with the water inlet cavity 12 and the water outlet cavity 13 through a water inlet hole 18 and a water outlet hole 19, and the water inlet hole 18 and the water outlet hole 19 are respectively provided with a water inlet check valve 20 and a water outlet check valve 21.

The diaphragm support 4 is arranged below the diaphragm 5, and in the prior art, the diaphragm support 4 is directly fixedly connected to the bottom of the fluid chamber 7, so that the fluid chamber 7, the diaphragm chamber 6, the diaphragm 5 and the diaphragm support 4 are assembled together. After the diaphragm support 4 is fixed on the fluid chamber 7, the diaphragm support 4 and the diaphragm chamber 6 are mutually extruded, the bottom end of the working cavity groove body 15 and the bottom end of the spacing structure 16 are extruded on the diaphragm 5 to be sealed, the outer edge of the working cavity groove body 15 and the bottom end of the spacing structure 16 between the working cavity groove bodies 15 are respectively provided with a sealing convex rib which is tightly matched and sealed with the diaphragm 5 to form each sealed working cavity 17, and each working cavity 17 is mutually independent and is spaced by the spacing structure 16.

When the diaphragm holder 4 is fixedly connected to the bottom of the fluid chamber 7, since the fluid chamber 7 is provided with the diaphragm chamber mounting groove 11, the diaphragm holder 4 can be generally fixed only to the structure of the edge of the diaphragm chamber mounting groove 11, that is, the outer periphery of the fluid chamber 7, and the middle portion of the diaphragm holder 4 cannot be fixed to the fluid chamber 7. I.e. the diaphragm chamber 6 and the middle part of the diaphragm holder 4 are free from any connection and in an unfixed state, only the periphery is pressed.

When the diaphragm pump works, the liquid pressure in the working cavity 17 is high, and the middle part of the diaphragm support 4 is not fixed, so that after the diaphragm pump works for a period of time, the middle part of the diaphragm support 4 is easy to deform downwards under the action of the high-pressure working cavity 17. The diaphragm support 4 is generally made of plastic, and is generally in a plate-shaped structure, so that the diaphragm support is easy to deform; in particular, the diaphragm support 4 is generally provided with a swing frame through hole 22 for the top of the swing frame 3 to pass through, and the swing frame through hole 22 further reduces the strength of the diaphragm support 4, so that the diaphragm support 4 is easier to deform downwards.

After the diaphragm support 4 deforms downwards, the mutual extrusion of the diaphragm support 4 and the diaphragm chamber 6 is not tight any more, the bottom end of the working cavity groove body 15 and the bottom end of the spacing structure 16 cannot be extruded tightly on the diaphragm 5 any more, and even a gap can be generated. On one hand, a gap between the bottom end of the working cavity groove body 15 and the diaphragm 5 can cause pressure leakage of the working cavity 17, so that pressure loss of the working cavity is caused, pressure is reduced, and the working efficiency of the diaphragm pump is reduced; on the other hand, the gap between the spacer structure 16 and the diaphragm 5 may cause the working chambers 17 to communicate with each other and leak, and the pressures of the working chambers 17 in different states may be neutralized and balanced with each other, which may also reduce the working efficiency of the diaphragm pump.

In the prior art, the strength of the diaphragm support 4 is increased, such as manufacturing the diaphragm support 4 with a metal having a larger strength than plastic, or embedding a metal skeleton in the middle when manufacturing the diaphragm support 4 with plastic. Both of these prior art approaches add cost and process difficulty to the manufacture of the diaphragm support 4.

In order to solve the above problem, the present invention provides a diaphragm support 4, which is fixed to the center of the diaphragm support 4 through the connecting screw 8, so that the diaphragm chamber 6, the diaphragm 5 and the diaphragm support 4 form an integral structure. The diaphragm support 4 is then fixedly attached to the bottom of the fluid chamber 7.

The utility model discloses a connecting screw 8 is fixed with diaphragm support 4's intermediate part and diaphragm 5 and diaphragm chamber 6 and is compressed tightly to compress tightly through the peripheral part of fluid chamber 7 with diaphragm support 4, closely press on diaphragm 5 with the lateral edge of working chamber cell body 15 and the interval structure 16 between the working chamber cell body 15, form each sealed working chamber 17. Even under the pressure effect of the working cavity 17, the middle part of the diaphragm support 4 is fixed by the connecting screw 8 and cannot deform downwards, the sealing performance, the durability and the deformation resistance of the diaphragm pump working cavity 17 are greatly improved on the premise of not changing the material of the diaphragm support 4, the diaphragm support 4 is made of plastic and has enough strength, the production cost and the process difficulty are reduced, the deformation is avoided, the pressure loss of the working cavity 17 cannot be caused, the mutual communication and leakage of the working cavities 17 cannot be caused, and the working efficiency of the diaphragm pump cannot be reduced.

The diaphragm support 4 is provided with a swing frame through hole 22, and the top of the swing frame 3 penetrates through the swing frame through hole 22 to be connected with the diaphragm 5, so that the diaphragm chamber 6, the diaphragm 5, the diaphragm support 4 and the swing frame 3 form an integral structure, and then are assembled with the fluid chamber 7 to form a pump body structure of the diaphragm pump. Then assemble motor 1 through following mode, form the diaphragm pump with pump body structure: the eccentric wheel 2 is arranged on an output shaft 23 of the motor 1, and the eccentric wheel 2 is matched with the bottom of the swing frame 3 through a bearing 24.

The utility model discloses when using, the outside liquid source (for example water tank etc.) is connected through outside pipeline etc. to inlet channel 9, and motor 1 drives eccentric wheel 2 and moves, because the axis of eccentric wheel 2 has certain contained angle with the axis of motor 1's output shaft 23, so through bearing 24 and 3 bottom cooperations backs of swinging bracket, periodic luffing motion of swinging bracket 3 under eccentric wheel 2's effect. The swing frame 3 is connected with the diaphragm 5, and the up-and-down swing of the swing frame 3 drives the diaphragm 5 to swing up and down to change the volume of the working cavity 17 periodically.

When the volume of the working chamber 17 becomes larger, the pressure in the working chamber 17 is low, and under the action of the negative pressure, the water inlet check valve 20 is opened, the water outlet check valve 21 is closed, the liquid in the water inlet chamber 12 is sucked into the working chamber 17 through the water inlet hole 18, and the liquid in the water inlet pipeline 9 correspondingly enters the water inlet chamber 12. When the volume of the working chamber 17 becomes smaller, the pressure in the working chamber 17 becomes high, under the action of the high pressure, the water inlet check valve 20 is closed, the water outlet check valve 21 is opened, and the liquid in the working chamber 17 is discharged into the water outlet chamber 13 through the water outlet hole 19 and further enters the water outlet pipeline 10. Thus, a periodic water suction and drainage process of one working chamber 17 is completed, the water suction and drainage process of one working chamber 17 is performed periodically and continuously, so that the liquid is continuously conveyed along the direction of an external liquid source, namely the water inlet pipeline 9, the water inlet cavity 12, the water inlet hole 18, the working chamber 17, the water outlet hole 19, the water outlet cavity 13 and the water outlet pipeline 10, and the water outlet pipeline 10 is used for being connected with external equipment through pipelines and the like and used for various operations such as irrigation, spraying, high-pressure injection, water pumping and the like.

The quantity of working chamber 17 has a plurality ofly, a plurality ofly with the different positions alignment of working chamber 17 swing span 3, the swing in-process of swing span 3, the top height of the different positions of same time swing span 3 has highly to have lowly for the working chamber 17 department of same time is in different water absorption and drainage states, the liquid pulse of a plurality of working chambers 17 to play water cavity 13 exhaust is not superpose simultaneously, but evenly distributed on the time horizon, make the liquid pulsation of outlet conduit 10 little, it is more steady.

The utility model discloses following beneficial effect has:

the utility model discloses a connecting screw closely presses the interval structure between the outside edge of working chamber cell body and the working chamber cell body on the diaphragm with the intermediate part and diaphragm and the diaphragm chamber fastening connection of diaphragm support, forms each sealed working chamber. Even under the pressure action of the working cavity, the middle part of the diaphragm support cannot deform downwards, the sealing property, the durability and the deformation resistance of the working cavity of the diaphragm pump are greatly improved on the premise of not changing the material of the diaphragm support, the strength of parts during working is greatly increased, the parts are not easy to deform, the pressure loss of the working cavity cannot be caused, the working cavities are not communicated with each other and leak, and the working efficiency of the diaphragm pump cannot be reduced; the diaphragm support has enough strength even if being made of plastics, and the production cost and the process difficulty are reduced.

As an improvement of the utility model, diaphragm chamber mounting groove 11 includes intake antrum cell body 25 and goes out water cavity cell body 26, goes out water cavity cell body 26 and is located diaphragm chamber mounting groove 11 middle part, the inside part of first annular baffle 32 in the picture promptly, and intake antrum cell body 25 is located out water cavity cell body 26 around, and intake antrum cell body 25 is the cell body of a whole intercommunication, keeps apart mutually through first annular baffle 32 with going out water cavity cell body 26, evenly distributed around the play water cavity cell body 26 outside. The water inlet channel 9 is communicated with the water inlet cavity body 25 through a water inlet 27, namely communicated with the water inlet cavity 12; the water outlet channel 10 is communicated with the water outlet cavity body 26 through the water outlet 28, namely communicated with the water outlet cavity 13.

The upper part of the diaphragm chamber 6 comprises a water inlet cavity groove body corresponding part 29 and a water outlet cavity groove body corresponding part 30, the water outlet cavity groove body corresponding part 30 is positioned in the middle of the upper part of the diaphragm chamber 6, namely the inner part of the second annular partition plate 31, and the water outlet hole 19 is positioned on the water outlet cavity groove body corresponding part 29. The working chamber 17 is a plurality of, and apopore 19 is corresponding also a plurality of, and a plurality of apopores 19 are all located inside second annular baffle 31. The water inlet cavity groove body corresponding part 29 is located around the water outlet cavity groove body corresponding part 30, the water inlet cavity groove body corresponding part 29 is of a whole communicated structure, is isolated from the water outlet cavity groove body corresponding part 30 through a second annular partition plate 31, and is uniformly distributed around the outer side of the water outlet cavity groove body corresponding part 30. The inlet openings 18 are located on the inlet cavity tank body corresponding portion 30, the number of the working cavities 17 is multiple, the number of the inlet openings 18 is also multiple, and the plurality of inlet openings 18 are evenly distributed on the inlet cavity tank body corresponding portion 29.

The water inlet cavity groove body 25 is matched with the corresponding part 29 of the water inlet cavity groove body to form a water inlet cavity 12; the water outlet cavity groove 26 is matched with the corresponding part 30 of the water outlet cavity groove to form the water outlet cavity 13. The number of the working chambers 17 is plural, and the plural working chambers are isolated from each other and individually operated. The water inlet cavity 12 is a communicated integral structure, a plurality of water inlet holes 18 are communicated with one water inlet cavity 12, and the water inlet holes 18 are uniformly distributed on the outer side of the water inlet cavity 12. The water outlet cavity 13 is also a communicated integral structure, the plurality of water outlet holes 19 are communicated with one water outlet cavity 13, and the plurality of water outlet holes 19 are uniformly distributed in the water outlet cavity 13.

Go out isolation structure 14 of water cavity 13 and intake antrum 12 and include first annular baffle 32 and second annular baffle 31, first annular baffle 32 sets up in diaphragm chamber mounting groove 11 and lies in between intake antrum cell body 25 and the play water cavity cell body 26, keeps apart intake antrum cell body 25 and a play water cavity cell body 26 each other. The second annular partition plate 31 is disposed at the upper portion of the diaphragm chamber 6 and between the inlet chamber tank body corresponding portion 29 and the outlet chamber tank body corresponding portion 30, and isolates the inlet chamber tank body corresponding portion 29 and the outlet chamber tank body corresponding portion 30 from each other.

The first annular partition plate 32 and the second annular partition plate 31 are matched and sealed through a sealing ring 33, and the water inlet cavity 12 is sealed and isolated from the water outlet cavity 13. Specifically, a seal ring groove 99 is formed in the bottom of the first annular partition plate 32, a seal ring 33 is arranged in the seal ring groove 99, and the top of the second annular partition plate 31 is inserted into the seal ring groove 99 and tightly supports the seal ring 33, so that sealing is realized.

The first annular partition 32 and the second annular partition 31 are preferably both annular, and the sealing ring 33 is preferably an O-ring seal.

The utility model discloses in, an inlet opening 18 and an apopore 19 of same working chamber 17 are along same radial distribution on diaphragm chamber 6, and apopore 19 is located same radial inboard, and inlet opening 18 is located same radial outside.

As another improvement of the embodiment of the present invention, a spacer 34 is disposed on the top surface of the diaphragm 5 in each working chamber 17, the spacer 34 is a circular sheet structure, a first assembling structure 100 is disposed in the middle of the lower surface of the spacer 34, a second assembling structure 101 is disposed on the upper surface of the diaphragm 5, and the first assembling structure 100 of the spacer 34 is matched with the second assembling structure 102 of the diaphragm 5. The first mounting structure 100 may be a downwardly convex structure and the second mounting structure 101 may be a downwardly concave structure, with the convex structure of the spacer 34 being located within the concave structure of the diaphragm 5.

The pad 34 is fixedly connected to the top of the swing frame 3 by a membrane connecting screw 35 after passing through the pad 34 and the membrane 5 from the top of the pad 34 downwards; the spacer 34, the diaphragm 5 and the top of the swing frame 3 are connected together by a diaphragm connection screw 35.

The utility model discloses set up gasket 34 between diaphragm connecting screw 35 and diaphragm 5, prevent that diaphragm connecting screw 35 from to the injury of diaphragm 5, the bottom outward flange of gasket 34 carries out the arc chamfer and smoothes, and the bottom outward flange of gasket 34 cuts diaphragm 5 when preventing that diaphragm 5 from warping.

The diaphragm 5 is provided with a circular concave part 102 around the gasket 34 for facilitating the deformation of the diaphragm 5, and when the diaphragm 5 deforms, the diaphragm 5 deforms at the circular concave part 102 to prevent the diaphragm 5 from being damaged after being deformed for multiple times.

The top of the swing frame 3 is provided with a swing head 36, and the top end surface of the swing head 36 is circular and is matched with the gasket 34 with a circular sheet structure. The diaphragm connection screw 35 fixedly connects the corresponding position of the spacer 34 and the diaphragm 5 to the top end of the swinging head 36. The bottom of the swing frame 3 is provided with a bearing groove 37, an eccentric wheel gasket 66 is sleeved on the output shaft 23 of the motor 1, the eccentric wheel 2 is sleeved on the output shaft 23 and positioned above the eccentric wheel gasket 66, the inner ring of the bearing 24 is sleeved on the eccentric wheel 2, and the outer ring of the bearing 24 is positioned in the bearing groove 37. The eccentric 2 transmits the swinging motion to the swing frame 3 through the bearing 24 and the bearing groove 37, so that the swing head 36 swings up and down periodically.

A motor bracket 67 is further arranged between the diaphragm bracket 4 and the motor 1, the eccentric wheel gasket 66, the eccentric wheel 2, the bearing 24 and the bearing groove 37 are positioned in a containing groove 68 at the upper part of the motor bracket 67, and the output shaft 23 of the motor 1 penetrates through a hole 69 at the bottom of the motor bracket 67 to enter the containing groove 68 and be connected with the eccentric wheel gasket 66 and the eccentric wheel 2. The edge of the bottom end of the fluid chamber 7, the edge of the diaphragm support 4 and the edge of the motor support 67 are connected through screws 64, the accommodating groove 68 is connected with the motor 1 through screws 70, a motor casing 71 is arranged outside the motor 1, the top of the motor casing 71 is connected with the bottom of the motor support 67 through screws 72, 4 motor pins 73 are arranged on the motor casing 71, and the motor pins 73 are inserted into connecting grooves 74 on the motor casing 71 and fixed on the motor casing 71 through adhesive glue.

The number of the working cavity grooves 15 is preferably 4, the 4 working cavity grooves 15 are uniformly distributed on the outer side of the center of the bottom end of the diaphragm chamber 6 in a square arrangement mode, the outer edge of each working cavity groove 15 is arc-shaped, and the arc-shaped outer edge of each working cavity groove 15 takes one point in each working cavity groove 15 (preferably the center point of each working cavity groove 15) as the center of a circle. The interval structure between 4 working chamber grooves 15 is a partition plate. 4 working chamber grooves 15 and 4 corresponding positions outside the center of the diaphragm 5 are matched to form 4 working chambers 17,4 working chambers are correspondingly provided with 4 sets of water outlet holes 19 and water inlet holes 18,4 water inlet holes 18 are uniformly distributed on one water inlet chamber 12 according to a square arrangement mode, and 4 water outlet holes 19 are uniformly distributed in one water outlet chamber 13.

The number of the gaskets 34 and the number of the swinging heads 36 are 4, the number of the gaskets is corresponding to the position of the working cavity 17, the gaskets are evenly distributed on the outer side of the center according to a square arrangement mode, the number of the swinging frame through holes 22 is 4, the swinging frame through holes are evenly distributed on the outer side of the center of the diaphragm support 4 according to the square arrangement mode, and the 4 swinging heads 36 respectively penetrate through the 4 swinging frame through holes 22 and are connected with the 4 corresponding positions on the outer side of the center of the diaphragm 5 through the gaskets 34 and the diaphragm connecting screws 25.

The centers of the diaphragm chamber 6, the diaphragm 5 and the diaphragm support 4 are not occupied by corresponding structures, so that the three can be conveniently connected at the center by the connecting screw 8. The diaphragm chamber 6, the diaphragm 5 and the diaphragm support 4 are provided with respective screw holes 75, 76 and 77 at the center, preferably, the center of the top end of the diaphragm support 4 is provided with a screw hole column 65 for connecting with the connecting screw 8, and the screw hole 77 is arranged on the screw hole column 65.

In this embodiment, the water inlet check valve 20 includes a water inlet valve core 38, a water inlet spring 39 and a water inlet spring seat 40, and the water inlet valve core 38, the water inlet spring 39 and the water inlet spring seat 40 are sequentially arranged in the water inlet hole 18 from top to bottom. The water inlet spring seat 40 is connected with the water inlet hole 18, so that the water inlet valve core 38, the water inlet spring 39 and the water inlet spring seat 40 form a whole in the water inlet hole 18, the water inlet valve core 38 is pressed against the upper end of the water inlet hole 18 in a sealing mode under the upward elastic force of the water inlet spring 39, and the water inlet hole 18 is closed. When negative pressure exists in the working chamber 17, the negative pressure overcomes the upward elastic force of the water inlet spring 39, so that the water inlet valve core 38 moves downwards to be separated from the upper end of the water inlet hole 18, and the water inlet hole 18 is opened. The water inlet spring seat 40 is provided with a water through hole 41 of the water inlet spring seat. So that the liquid in the water inlet cavity 12 can enter the working cavity 17 through the water inlet hole 18 and the water through hole 41 of the water inlet spring seat.

The water outlet check valve 21 includes a water outlet valve core 42, a water outlet spring 43 and a water outlet spring seat 44, and the water outlet valve core 42, the water outlet spring 43 and the water outlet spring seat 44 are sequentially arranged in the water outlet hole 19 from bottom to top. The outlet spring seat 44 is connected with the water outlet hole 19, so that the outlet valve core 42, the outlet spring 43 and the outlet spring seat 44 form a whole in the water outlet hole 19, and the outlet valve core 42 is pressed against the lower end of the water outlet hole 19 in a sealing manner by the downward elastic force of the outlet spring 43, so that the outlet valve core 42 is closed to seal the water outlet hole 19. When high pressure is in the working chamber 17, the high pressure overcomes the upward elastic force of the water outlet spring 43, so that the water outlet valve core 42 moves downward to be separated from the lower end of the water outlet hole 19, and the water outlet hole 19 is opened. The water outlet spring seat 44 is provided with a water outlet spring seat water through hole 45, so that the liquid in the working cavity 17 can enter the water outlet cavity 13 through the water outlet hole 19 and the water inlet and outlet spring seat water through hole 45.

The utility model discloses do not restrict into water spring holder 40, play water spring holder 44 respectively with inlet opening 18, apopore 19's connected mode, in one of them example, go out water spring holder 44 and apopore 19 and link together with interference fit's mode, go out water spring holder 44 interference fit and press in apopore 19, interference fit's mating force is greater than the elasticity of play water spring 43, presses outlet valve case 42, the whole pressure of play water spring 43 in apopore 19. Since the working chamber 17 discharges high-pressure liquid to the outlet chamber 13 through the outlet hole 19, in order to prevent the outlet spring seat 44 from being washed upward by the high-pressure liquid, an assembly column 46 is disposed in the diaphragm chamber mounting groove 11, and the assembly column 46 is pushed against the top end surface of the outlet spring seat 44 from above, so as to fix (i.e., press) the outlet spring seat 44 downward in the outlet hole 19.

Accordingly, the inlet spring retainer 40 and the inlet opening 18 may be connected together in an interference fit. Because the low-pressure liquid flows in the water inlet hole 18, the interference-fit water inlet spring seat 40 is not easily flushed by the liquid, and therefore a fixing structure for the water inlet spring seat 40 does not need to be arranged, and certainly, a corresponding fixing structure can be arranged to upwards fix (namely press) the water inlet spring seat 40 in the water inlet hole 18, and the arrangement mode of the fixing structure is not limited.

When the diaphragm pump works normally, liquid is continuously conveyed from the water inlet cavity 12 to the water outlet cavity 13, when the water outlet channel 10 or an external pipeline connected with the water outlet channel is blocked, the water pressure in the water outlet cavity 13 and the water outlet channel 10 is continuously increased, and if no protective measures are taken, the diaphragm pump or other externally connected equipment can be damaged.

Therefore, an overpressure protection measure needs to be provided for the diaphragm pump, in this embodiment, the overpressure protection measure is a pressure-limiting power-off device 47, the pressure-limiting power-off device 47 includes a first pressure-limiting cavity 48 with an open upper end, the bottom of the first pressure-limiting cavity 48 is communicated with the water outlet cavity 13 through a first high-pressure hole 49, a first pressure-reducing cushion 50 is provided at the top end of the first pressure-limiting cavity 48, a first spring sleeve 51 is provided at the top end of the first pressure-reducing cushion 50, a first pressure-reducing ring 52 is sleeved around the first spring sleeve 51, a first pressure-regulating spring 53 is provided in the first spring sleeve 51, a first spring seat 54 is provided at the top end of the first pressure-regulating spring 53, a first pressure-regulating screw 55 is provided at the top end of the first spring seat 54, a microswitch 56 is provided above the first spring sleeve 51, and a contact 57 of the microswitch 56 is located above a top flange of the first spring sleeve 51.

When the diaphragm pump normally works, the first pressure regulating spring 53 downwards presses the first spring sleeve 51 and the first pressure reducing cushion 50 at the top of the first pressure limiting cavity 48, the top flange of the first spring sleeve 51 does not press the contact 57 of the microswitch 56, and the motor 1 of the diaphragm pump continuously and normally works. When the water outlet channel 10 or the external pipeline connected with the water outlet channel is blocked, the pressure of the liquid in the water outlet cavity 13 rises, the pressure of the liquid in the water outlet cavity 13 is transmitted to the first pressure limiting cavity 48 through the first high-pressure hole 49, and the pressure of the liquid is amplified through the first pressure limiting cavity 48. The upward liquid pressure in the first pressure limiting cavity 48 overcomes the downward elastic force of the first pressure regulating spring 53, so that the first pressure reducing cushion 50 deforms upward, the first spring sleeve 51 is pushed to move upward for a certain distance, the top flange of the first spring sleeve 51 presses the contact 57 of the microswitch 56, the microswitch 56 enables the circuit to be disconnected and electrified, the motor 1 stops running, and the water pressure in the water outlet channel 10 is limited in a certain range to prevent the equipment from being damaged. When the blockage fault is eliminated, the water pressure of the water outlet channel 10 is reduced, the first spring sleeve 51 and the first pressure reducing soft cushion 50 are reset under the pressure of the first pressure regulating spring 53, the contact 57 of the microswitch 56 is reset, and the motor 1 starts to operate again.

The first decompression ring 52 serves to guide the up-and-down movement of the first spring housing 51, and a space for the first decompression cushion 50 to be deformed upward is left at the lower outer circumference of the first decompression ring 52. The first pressure adjusting screw 55 is used for adjusting the up-and-down position of the first spring seat 54, and thus adjusting the tightness of the first pressure adjusting spring 53, so that the first pressure reducing cushion 50 deforms upward under a suitable liquid pressure.

A first pressure limiting chamber 48 opens at the top of the fluid chamber 7 and a first pressure relief cushion 50 is mounted at the top of the first pressure limiting chamber 48 at the top of the fluid chamber 7. The first pressure reducing ring 52 is interference fit in a groove 59 in the bottom of the top cover 58, and the first spring housing 51, the first pressure regulating spring 53 and the first spring seat 54 are located inside the top cover 58 between the first pressure reducing ring 52 and the top wall of the top cover 58. The top of top cap 58 is provided with switch protecting cover 60, and micro-gap switch 56 is located switch protecting cover 60, has seted up window 61 on the roof of top cap 58, and micro-gap switch 56 bottom is passed inside window 61 gets into top cap 58, and micro-gap switch 56's contact 57 is located micro-gap switch 56's bottom surface.

The switch cover 60 is connected with the top cover 58 through a screw 62, the first pressure regulating screw 55 penetrates through the switch cover 60 and the top wall of the top cover 58 from the upper part of the switch cover 60 downwards and then abuts against the top end of the first spring seat 54, and the top cover 58 is connected to the top end of the fluid chamber 7 through a screw 63.

Example 2:

the difference between the present embodiment and embodiment 1 is that the water inlet check valve 20 and the water outlet check valve 21 in embodiment 1 use a check valve structure formed by combining a water inlet (water outlet) valve core, a water inlet (water outlet) spring and a water inlet (water outlet) spring seat, while the water inlet check valve and the water outlet check valve in the present embodiment are soft valve sheet structures, and the difference between the present embodiment and embodiment 1 is shown in fig. 23-25.

Wherein, the check valve that intakes includes inlet opening soft valve piece 78, and the check valve that goes out includes apopore soft valve piece 79, and inlet opening soft valve piece 78 and apopore soft valve piece 79 all include conical joint portion 80, 82 and slice sealing portion 81, 83.

The inlet opening 84 and outlet opening of this embodiment are different from the inlet opening 18 of embodiment 1, the inlet opening 18 and outlet opening 19 of embodiment 1 are larger openings, and the components of the inlet check valve 20 and outlet check valve 21 are located in the inlet opening 18 and outlet opening 19.

The inlet hole 84 of this embodiment is shown in fig. 24 and includes a circle of smaller holes, and a mounting hole is further provided in the middle of the circle of smaller holes for mounting the tapered joint portion 80 of the inlet hole soft valve sheet 78. The water inlet hole flexible valve plate 78 is positioned in the working cavity 17, the conical joint part 80 of the water inlet hole flexible valve plate 78 is connected with the diaphragm chamber 6 at the water inlet hole 84 through a middle mounting hole, and the sheet-shaped sealing part 81 of the water inlet hole flexible valve plate 78 is attached to the bottom end of the water inlet hole 84 in the working cavity 17. When negative pressure exists in the working chamber 17, the sheet sealing part 81 of the water inlet hole flexible valve sheet 78 is opened towards the working chamber 17 under the action of the negative pressure, and liquid enters the working chamber 17 from the water inlet chamber 12. When the pressure in the working chamber 17 is positive, the sheet sealing portion 81 of the water inlet soft valve sheet 78 is pressed on the water inlet 84 toward the water inlet chamber 12 under the action of the positive pressure, and the water inlet 84 is sealed.

Similar to the inlet opening 84, the outlet opening 85 is also a circle of smaller openings, and a mounting opening is provided in the middle of the circle of smaller openings for mounting the conical joint portion 81 of the outlet flap 79. The water outlet soft valve plate 79 is positioned in the water outlet cavity 13, the conical joint part 81 of the water outlet soft valve plate 79 is connected with the diaphragm chamber 6 at the water outlet 85 through a middle mounting hole, and the sheet-shaped sealing part 83 of the water outlet soft valve plate 79 is attached to the top end of the water outlet 85. When the pressure in the working chamber 17 is high, the sheet sealing part 83 of the water outlet hole flexible valve sheet 79 is opened towards the water outlet chamber 13 under the action of the high pressure, and the liquid enters the water outlet chamber 13 from the working chamber 17. When negative pressure exists in the working cavity 17, the sheet sealing part 83 of the water outlet soft valve sheet 79 is pressed on the water outlet 85 in the direction of the working cavity 17 under the action of the negative pressure, and the water outlet 85 is sealed.

In this embodiment, since the water inlet hole flexible valve sheet 78 and the water hole flexible valve sheet 79 are tightly connected to the diaphragm chamber 6 through the tapered joint portions 80, 82 thereof and are not washed away by the liquid flow, the assembling post 46 similar to that of embodiment 1 can be omitted.

In this embodiment, except that the structures of the water inlet check valve, the water outlet check valve, the water inlet hole and the water outlet hole, and the corresponding structures matched with these structures are different from those of embodiment 1, the others are the same as those of embodiment 1, and the description of this embodiment is omitted.

Example 3:

the difference between this embodiment and embodiment 1 is that the overpressure protection measure of embodiment 1 is a voltage-limiting power cut-off device 47, while the overpressure protection measure of this embodiment is a voltage-limiting backflow device 86, as shown in fig. 26-30. The pressure limiting backflow device 86 comprises a second pressure limiting cavity 87 with an open upper end, the bottom of the second pressure limiting cavity 87 is communicated with the water outlet cavity 13 through a second high-pressure hole 88, a backflow cavity 89 with an open upper end is arranged around the second pressure limiting cavity 87, the backflow cavity 89 is communicated with the water inlet channel 9 through a backflow hole 90, a cavity partition board 91 is arranged between the second pressure limiting cavity 87 and the backflow cavity 89, the cavity partition board 91 is annular in shape, and the side faces of the second pressure limiting cavity 87 and the backflow cavity 89 are spaced.

The top ends of the second pressure limiting cavity 87 and the backflow cavity 89 are provided with a second pressure reducing cushion 92, the top of the second pressure reducing cushion 92 is provided with a second spring sleeve 93, a second pressure reducing ring 94 is sleeved around the second spring sleeve 93, a second pressure regulating spring 95 is arranged in the second spring sleeve 93, the top end of the second pressure regulating spring 95 is provided with a second spring seat 96, and the top end of the second spring seat 96 is provided with a second pressure regulating screw 97.

When the diaphragm pump normally works, the second pressure regulating spring 95 downwards presses the second spring sleeve 93 and the second pressure reducing cushion 92 at the tops of the second pressure limiting cavity 87 and the backflow cavity 89, the second pressure limiting cavity 87 and the backflow cavity 89 are not communicated under the isolation of the cavity partition plate 91 and the second pressure reducing cushion 92, the motor 1 of the diaphragm pump continuously and normally works, and liquid is conveyed along the direction of the water inlet pipeline 9, the water inlet cavity 12, the working cavity 17 and the water outlet cavity 13.

When the water outlet channel 10 or the external pipeline connected with the water outlet channel is blocked, the pressure of the liquid in the water outlet cavity 13 rises, the pressure of the liquid in the water outlet cavity 13 is transmitted to the second pressure limiting cavity 87 through the second high-pressure hole 88, and the pressure of the liquid is amplified through the second pressure limiting cavity 87. The upward liquid pressure of the second pressure limiting cavity 87 overcomes the downward elastic force of the second pressure regulating spring 95, the second pressure reducing cushion 92 deforms upward, so that the second pressure limiting cavity 87 and the backflow cavity 89 are communicated from the top, liquid flows back in the direction of the water inlet channel 9 according to the water outlet cavity 13, the second high pressure hole 88, the second pressure limiting cavity 87, the backflow cavity 89, the backflow hole 90 and the water inlet channel 9, namely the liquid in the water outlet cavity 13 flows back into the water inlet channel 9, the pressure in the water outlet cavity 13 is reduced, the water pressure in the water outlet channel 10 is limited within a certain range, and equipment damage is prevented.

When the blockage fault is eliminated, the water pressure of the water outlet channel 10 is reduced, the second spring sleeve 93 and the second pressure reducing soft cushion 92 reset under the pressure of the second pressure regulating spring 95, the second pressure reducing soft cushion 92 plugs and isolates the top of the second pressure limiting cavity 87 and the top of the backflow cavity 89 again, the backflow of liquid is finished, and the diaphragm pump returns to normal work.

In embodiment 1, when the pressure of the liquid in the water outlet cavity 13 rises, the motor 1 stops working, and the pressure of the water outlet cavity 13 is prevented from being too high by stopping working; in this embodiment, when the pressure of the liquid in the water outlet chamber 13 rises, the motor 1 does not stop but operates all the time, and the pressure in the water outlet chamber 13 is prevented from being too high by a backflow manner.

A second pressure limiting chamber 87 and a return chamber 89 open at the top of the fluid chamber 7, and a second pressure reducing cushion 92 is mounted at the top of the second pressure limiting chamber 87 and the return chamber 89 at the top of the fluid chamber 7. The second spring housing 93, the second pressure reducing ring 94, the second pressure regulating spring 95 and the second spring seat 96 are located in a return head cover 98, and the return head cover 98 is connected to the top end of the fluid chamber 7 by screws. The second pressure regulating screw 97 passes downward through the return top cover 98 from above the return top cover 98 and abuts on the top end of the second spring seat 96.

In this embodiment, the other parts are the same as those in embodiment 1 except that the voltage-limiting backflow device 86 is different from the voltage-limiting power-off device 47 in embodiment 1, and the corresponding structure matched with the voltage-limiting backflow device 86 is different, and the description of this embodiment is omitted.

Example 4:

the difference between this embodiment and embodiment 1 is that this embodiment uses the water inlet check valve and the water outlet check valve of the soft valve piece structure described in embodiment 2, and uses the pressure limiting backflow device 86 described in embodiment 3. Except that the structure is different from embodiment 1 and the corresponding structure matched with the structure is different from embodiment 1, the other parts are the same as embodiment 1, and the description of this embodiment is omitted.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (11)

1. A diaphragm pump comprising a motor, an eccentric, a wobble frame, a diaphragm support, a diaphragm chamber, a fluid chamber, and a connection screw, wherein:

the fluid chamber is provided with a water inlet channel and a water outlet channel, the lower part of the fluid chamber is provided with a diaphragm chamber mounting groove which is opened downwards, the diaphragm chamber is mounted in the diaphragm chamber mounting groove from the lower part, and a space between the fluid chamber and the diaphragm chamber forms a water inlet cavity and a water outlet cavity; the water inlet cavity and the water outlet cavity are sealed and isolated through an isolation structure, the water inlet channel is communicated with the water inlet cavity, and the water outlet channel is communicated with the water outlet cavity;

the diaphragm is arranged below the diaphragm chamber, and a working chamber is formed by the space between one working chamber groove body and the diaphragm; each working cavity is communicated with the water inlet cavity and the water outlet cavity through a water inlet hole and a water outlet hole respectively, and a water inlet check valve and a water outlet check valve are arranged on the water inlet hole and the water outlet hole respectively;

the diaphragm support is arranged below the diaphragm, the connecting screw fixes the center of the diaphragm chamber and the center of the diaphragm to the diaphragm support, and the diaphragm support is fixedly connected to the bottom of the fluid chamber;

the diaphragm support is provided with a swing frame through hole, the top of the swing frame penetrates through the swing frame through hole to be connected with the diaphragm, the eccentric wheel is arranged on an output shaft of the motor, and the eccentric wheel is matched with the bottom of the swing frame through a bearing.

2. The diaphragm pump of claim 1, wherein the diaphragm chamber mounting groove comprises a water inlet chamber groove body and a water outlet chamber groove body, the water outlet chamber groove body is located in the middle of the diaphragm chamber mounting groove, the water inlet chamber groove body is located around the water outlet chamber groove body, the water inlet channel is communicated with the water inlet chamber groove body through a water inlet, and the water outlet channel is communicated with the water outlet chamber groove body through a water outlet;

the upper part of the diaphragm chamber comprises a water inlet cavity groove body corresponding part and a water outlet cavity groove body corresponding part, the water outlet cavity groove body corresponding part is positioned in the middle of the upper part of the diaphragm chamber, the water inlet cavity groove body corresponding part is positioned around the water outlet cavity groove body corresponding part, the water inlet hole is positioned on the water inlet cavity groove body corresponding part, and the water outlet hole is positioned on the water outlet cavity groove body corresponding part;

the water inlet cavity groove body is matched with the corresponding part of the water inlet cavity groove body to form the water inlet cavity; the water outlet cavity groove body is matched with the corresponding part of the water outlet cavity groove body to form the water outlet cavity.

3. The diaphragm pump of claim 2, wherein the isolation structure comprises a first annular partition plate and a second annular partition plate, the first annular partition plate is arranged in the diaphragm chamber mounting groove and is positioned between the water inlet cavity body and the water outlet cavity body, and the second annular partition plate is arranged at the upper part of the diaphragm chamber and is positioned between the corresponding part of the water inlet cavity body and the corresponding part of the water outlet cavity body;

a sealing ring groove is formed in the bottom of the first annular partition plate, a sealing ring is arranged in the sealing ring groove, and the top of the second annular partition plate is inserted into the sealing ring groove and tightly props against the sealing ring to hermetically isolate the water inlet cavity and the water outlet cavity.

4. The diaphragm pump of claim 1 wherein each working chamber has a spacer disposed on a top surface of the diaphragm, the spacer having a circular sheet-like configuration, a first mounting structure disposed in a middle portion of a lower surface of the spacer, and a second mounting structure disposed on an upper surface of the diaphragm, the first mounting structure of the spacer mating with the second mounting structure of the diaphragm;

the gasket is fixedly connected to the top of the swing frame after passing through the gasket and the diaphragm downwards from the top of the gasket through a diaphragm connecting screw;

arc chamfer is carried out on the outward flange of gasket bottom level and smooth, the diaphragm is in be provided with around the gasket and be used for the convenience the annular concave part of diaphragm deformation.

5. The diaphragm pump according to claim 4, wherein the top of the swing frame is provided with a swing head, the top end of the swing head is circular, the diaphragm connecting screw is connected to the top end of the swing head, the bottom of the swing frame is provided with a bearing groove, the inner ring of the bearing is sleeved on the eccentric wheel, and the outer ring of the bearing is positioned in the bearing groove.

6. The diaphragm pump according to claim 5, wherein the number of the working chamber tanks, the number of the gaskets, and the number of the swing heads are all 4, the 4 working chamber tanks are uniformly distributed outside the center of the diaphragm chamber in a square arrangement manner, and the spacing structures among the 4 working chamber tanks are partition plates.

7. The diaphragm pump of claim 1, wherein the inlet check valve comprises an inlet port flexible valve plate, the outlet check valve comprises an outlet port flexible valve plate, and the inlet port flexible valve plate and the outlet port flexible valve plate each comprise a conical joint portion and a flap seal portion;

the water inlet soft valve sheet is positioned in the working cavity, the conical joint part of the water inlet soft valve sheet is connected with the diaphragm chamber at the water inlet, and the sheet sealing part of the water inlet soft valve sheet is attached to the bottom end of the water inlet; the water outlet soft valve block is positioned in the water outlet cavity, the conical joint part of the water outlet soft valve block is connected with the diaphragm chamber at the water outlet, and the sheet sealing part of the water outlet soft valve block is attached to the top end of the water outlet.

8. The diaphragm pump of claim 1, wherein the water inlet check valve comprises a water inlet valve core, a water inlet spring and a water inlet spring seat, and the water inlet valve core, the water inlet spring and the water inlet spring seat are sequentially arranged in the water inlet hole from top to bottom; the water inlet spring seat is connected with the water inlet hole, the water inlet valve core is subjected to upward elastic force of the water inlet spring, so that the water inlet valve core is tightly propped against the upper end of the water inlet hole, and the water inlet spring seat is provided with a water through hole of the water inlet spring seat;

the water outlet one-way valve comprises a water outlet valve core, a water outlet spring and a water outlet spring seat, and the water outlet valve core, the water outlet spring and the water outlet spring seat are sequentially arranged in the water outlet hole from bottom to top; the water outlet spring seat is connected with the water outlet hole, the water outlet valve core is subjected to downward elastic force of the water outlet spring, so that the water outlet valve core is abutted against the lower end of the water outlet hole in a sealing manner, and a water through hole of the water outlet spring seat is formed in the water outlet spring seat.

9. The diaphragm pump of claim 8 wherein the inlet spring seat and the inlet opening are connected together in an interference fit; the water outlet spring seat is connected with the water outlet hole in an interference fit mode, an assembly column is arranged in the diaphragm chamber mounting groove, and the assembly column is propped against the top end face of the water outlet spring seat from the upper side.

10. The diaphragm pump according to any one of claims 1 to 9, further comprising a pressure limiting and power-off device, wherein the pressure limiting and power-off device comprises a first pressure limiting cavity with an open upper end, the bottom of the first pressure limiting cavity is communicated with the water outlet cavity through a first high pressure hole, a first pressure reducing cushion is arranged at the top end of the first pressure limiting cavity, a first spring sleeve is arranged at the top of the first pressure reducing cushion, a first pressure reducing ring is sleeved around the first spring sleeve, a first pressure regulating spring is arranged in the first spring sleeve, a first spring seat is arranged at the top end of the first pressure regulating spring, a first pressure regulating screw is arranged at the top end of the first spring seat, a micro switch is arranged above the first spring sleeve, and a contact of the micro switch is located above a flange at the top end of the first spring sleeve.

11. The diaphragm pump according to any of the claims 1-9, wherein the diaphragm pump further comprises a pressure limiting backflow device, the pressure limiting backflow device comprises a second pressure limiting cavity with an open upper end, the bottom of the second pressure limiting cavity is communicated with the water outlet cavity through a second high pressure hole, a backflow cavity with an open upper end is arranged around the second pressure limiting cavity, the backflow cavity is communicated with the water inlet channel through a backflow hole, and a cavity partition plate is arranged between the second pressure limiting cavity and the backflow cavity; second pressure limiting cavity and backward flow chamber top are provided with second decompression cushion, second decompression cushion top is provided with the second spring housing, the cover has the second pressure reduction circle around the second spring housing, be provided with second pressure regulating spring in the second spring housing, second pressure regulating spring top is provided with the second spring holder, second spring holder top is provided with second pressure regulating screw.

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