CN213205933U

CN213205933U - Diaphragm pump

Info

Publication number: CN213205933U
Application number: CN202021845649.0U
Authority: CN
Inventors: 杜修元; 高东峰; 虞海洋; 杜茂森
Original assignee: Shandong Zhongju Electric Co ltd
Current assignee: Shandong Zhongju Electric Co ltd
Priority date: 2020-08-30
Filing date: 2020-08-30
Publication date: 2021-05-14
Anticipated expiration: 2030-08-30

Abstract

The utility model discloses a diaphragm pump belongs to the diaphragm pump field. The pump comprises a duplex pump body in an integrated structure, and a first motor and a second motor which are arranged below the duplex pump body in parallel; the duplex pump body is internally provided with a water inlet channel, a water outlet channel, a first water inlet cavity, a first water outlet cavity, a second water inlet cavity and a second water outlet cavity; the output shaft of the first motor is sequentially connected with a first eccentric wheel, a first eccentric wheel bearing, a first swing frame, a first diaphragm and a first diaphragm chamber from bottom to top, and the output shaft of the second motor is sequentially connected with a second eccentric wheel, a second eccentric wheel bearing, a second swing frame, a second diaphragm and a second diaphragm chamber from bottom to top. The utility model discloses increased the flow of pump, appearance compact, long service life.

Description

Diaphragm pump

Technical Field

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

Background

Diaphragm pumps rely on the back and forth pumping of a diaphragm to change the working chamber volume to draw in and expel fluid. The diaphragm separates the sucked liquid from the discharged liquid, and when the diaphragm moves to one side of the transmission mechanism, the liquid is sucked by negative pressure when the pump cavity works, and when the diaphragm pad moves to the other side, the liquid is discharged.

The flow of diaphragm pumps in the prior art is generally not high, for example, the booster pump used for purifying water at present, the water purifying capacity generally does not exceed 600 gallons per day, and in order to realize a diaphragm pump with a large flow, the following methods are generally adopted in the prior art: 1. the high-power motor is used, the torque and the rotating speed of the motor are improved, 2, the working cavity of the diaphragm pump body is enlarged, 3, the eccentric angle of the eccentric wheel is increased, and therefore the compression stroke and the expansion stroke of the working cavity are improved.

However, the above-mentioned method for increasing the flow rate of the diaphragm pump has the disadvantage that the stress condition of the diaphragm during operation is greatly deteriorated, which often causes premature tearing of the diaphragm and scrapping of the water pump. National standards require that the service life of the pump can not be less than 2000 hours, but the service life of the diaphragm pump with the flow rate of over 600 gallons, particularly over 800 gallons, currently adopted in China does not exceed 1000 hours, and the diaphragm pump is limited by cost and is generally expensive.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a diaphragm pump, the utility model discloses increased the flow of pump, appearance compact, long service life.

The utility model provides a technical scheme as follows:

the utility model provides a diaphragm pump, includes the duplex pump body of integrative structure and sets up side by side first motor and the second motor of duplex pump body below, wherein:

the duplex pump body is internally provided with a water inlet channel, a water outlet channel, a first water inlet cavity, a first water outlet cavity, a second water inlet cavity and a second water outlet cavity, the water inlet channel is communicated with the first water inlet cavity and the second water inlet cavity, and the water outlet channel is communicated with the first water outlet cavity and the second water outlet cavity;

the output shaft of the first motor is sequentially connected with a first eccentric wheel, a first eccentric wheel bearing and a first swing frame from bottom to top, a first diaphragm located in the duplex pump body is connected above the first swing frame, a first diaphragm chamber is arranged above the first diaphragm, a first working cavity is formed in the space between the first diaphragm chamber and the first diaphragm, the first working cavity is respectively communicated with the first water inlet cavity and the first water outlet cavity through a first water suction hole and a first water discharge hole in the first diaphragm chamber, and a first water suction hole soft valve plate and a first water discharge hole soft valve plate are respectively arranged on the first diaphragm chamber at the first water suction hole and the first water discharge hole;

the output shaft from the bottom up of second motor has connected gradually second eccentric wheel, second eccentric wheel bearing and second swing span, second swing span top is connected with and is located the internal second diaphragm of duplex pump, second diaphragm top is provided with second diaphragm chamber, the space between second diaphragm chamber and the second diaphragm forms second working chamber, second working chamber pass through second suction opening and second wash port on the second diaphragm chamber respectively with second intake antrum and second play water cavity intercommunication, lie in on the second diaphragm chamber second suction opening and second wash port department are provided with second suction opening soft valve piece and second wash port soft valve piece respectively.

Step-shaped blind holes are formed in the lower surfaces of the working areas of the first diaphragm and the second diaphragm, and the diameter of an opening part of each step-shaped blind hole is smaller than the inner diameter of each step-shaped blind hole; the first swing frame and the second swing frame are provided with swing heads, the top ends of the swing heads are provided with protruding portions, the diameters of the tail ends of the protruding portions are larger than the diameters of the roots of the protruding portions, and the protruding portions are inserted into the step-shaped blind holes.

Furthermore, the first diaphragm and the second diaphragm are provided with a convex part protruding upwards or a concave part sinking downwards at the working area, the height of the convex part is matched with the position of the highest point of the swinging head, and the depth of the concave part is matched with the position of the lowest point of the swinging head.

Further, along the direction from the center to the periphery of the first diaphragm and the second diaphragm, the height of the bulge part is gradually increased, so that the bulge part is upwards inclined by a first angle along the direction from the center to the periphery of the first diaphragm and the second diaphragm, and the first angle is equal to the included angle between the axis of the first/second swing frame and the output shaft of the first/second motor;

or the depth of the concave part is gradually increased along the direction from the center to the periphery of the first diaphragm and the second diaphragm, so that the concave part is inclined downwards along the direction from the center to the periphery of the first diaphragm and the second diaphragm by a first angle which is equal to the included angle between the axis of the first/second swing frame and the output shaft of the first/second motor.

Furthermore, a first diaphragm support and a second diaphragm support are respectively arranged below the first diaphragm and the second diaphragm, thickened areas with upper surfaces thickened upwards are arranged on working areas of the first diaphragm and the second diaphragm, and the stepped blind holes are formed in the thickened areas; the front end of the water inlet channel is provided with a water inlet used for being connected with an external pipeline, and the rear end of the water outlet channel is provided with a water outlet used for being connected with the external pipeline.

Furthermore, the first water inlet cavity and the first water outlet cavity are separated by a first diaphragm chamber and a circular first partition plate, and a first sealing gasket is arranged between the first partition plate and the first diaphragm chamber; the second water inlet cavity and the second water outlet cavity are separated by a second diaphragm chamber and a circular second partition plate, and a second sealing gasket is arranged between the second partition plate and the second diaphragm chamber.

Furthermore, the water inlet channel is positioned below the water outlet channel, and the second water inlet cavity of the first water inlet cavity is communicated with the water inlet channel through an opening formed below the water inlet channel; first play water cavity pass through drainage pipe with go out the waterway intercommunication, drainage pipe follows inhalant canal's both sides are crossed inhalant canal and are upwards connected with the exhalant canal, second go out the water cavity through set up in the outlet of annular second baffle top with go out the waterway intercommunication.

Furthermore, first water absorption hole soft valve piece, first water drainage hole soft valve piece, second water absorption hole soft valve piece and second water drainage hole soft valve piece all include with first diaphragm chamber or the back taper joint that the second diaphragm chamber is connected and with first water absorption hole, first water drainage hole, second water absorption hole or the circular slice portion of second water drainage hole complex.

Further, still be provided with the pressure limiting overflow arrangement in the duplex pump body, the pressure limiting overflow arrangement include with the first pressure limiting chamber of water outlet channel intercommunication and with the backward flow hole of water inlet channel intercommunication, first pressure limiting chamber is located around the backward flow hole, the top in backward flow hole and first pressure limiting chamber is provided with the first sealed pad of first pressure limiting chamber and backward flow hole seal isolation, first sealed pad top is provided with first spring housing, the cover has first leading circle around the first spring housing, be provided with first spring in the first spring housing, first spring top is provided with first spring holder, first spring holder top is provided with installs first pressure regulating screw on the pressure regulating top cap.

Furthermore, a pressure limiting and power-off device is further arranged in the duplex pump body and comprises a second pressure limiting cavity communicated with the water outlet channel, a second sealing gasket is arranged at the top end of the second pressure limiting cavity, a second spring sleeve is arranged at the top of the second sealing gasket, a second guide ring is sleeved on the periphery of the second spring sleeve, a second spring is arranged in the second spring sleeve, a second spring seat is arranged at the top end of the second spring, and a contact of a microswitch is arranged above a flange at the top of the second spring sleeve.

The utility model discloses following beneficial effect has:

the utility model integrates two working units in the same duplex pump body, and the two working units work together through the water inlet channel, the water outlet channel, the first water inlet cavity, the first water outlet cavity, the second water inlet cavity and the second water outlet cavity which are designed in the duplex pump body, the flow rate of the working units can reach more than 800 gallons, and the flow rate of the pump is increased; the two working units share one water inlet channel and one water outlet channel, so that external pipeline connection is omitted, the pipeline connection is convenient, and the appearance volume is compact; and the utility model discloses the atress condition that the mode of increase flow can not make the diaphragm worsens, and the life of diaphragm pump can reach national standard's requirement.

Drawings

Fig. 1 is a schematic view of an external structure of a diaphragm pump according to the present invention;

FIG. 2 is a cross-sectional view of a diaphragm pump having a pressure limiting overflow arrangement in accordance with the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a sectional view taken along line B-B of FIG. 2;

FIG. 5 is a perspective view of a twin pump body;

FIG. 6 is a bottom view of the twin pump body;

FIG. 7 is a cross-sectional view taken along line C-C of FIG. 6;

FIG. 8 is a cross-sectional view taken along line D-D of FIG. 7;

FIG. 9 is a cross-sectional view taken along line E-E of FIG. 7;

FIG. 10 is a cross-sectional view of a diaphragm pump having a pressure limiting electrical disconnect device in accordance with the present invention;

FIG. 11 is a sectional view taken along line F-F of FIG. 10;

FIG. 12 is a perspective view of one orientation of a first diaphragm and a second diaphragm having a recess;

FIG. 13 is a perspective view of another orientation of the first and second diaphragms with the depressions;

FIG. 14 is a sectional view taken along line G-G of FIG. 13;

FIG. 15 is a cross-sectional view of a first diaphragm and a second diaphragm having a protrusion;

FIG. 16 is a perspective view of the first swing frame and the second swing frame.

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.

The embodiment of the utility model provides a diaphragm pump, as shown in fig. 1-16, its pair pump body 1 including a body structure and set up side by side at the first motor 2 and the second motor 3 of pair pump body 1 below, wherein:

the duplex pump body 1 is internally provided with a water inlet channel 4, a water outlet channel 5, a first water inlet cavity 6, a first water outlet cavity 7, a second water inlet cavity 8 and a second water outlet cavity 9, the water inlet channel 4 is communicated with the first water inlet cavity 6 and the second water inlet cavity 8, and the water outlet channel 5 is communicated with the first water outlet cavity 7 and the second water outlet cavity 9.

The output shaft 10 of the first motor 2 has connected gradually first eccentric wheel 11 from the bottom up, first eccentric wheel bearing 12 and first swing frame 13, first swing frame 13 top is connected with the first diaphragm 14 that is located the pair pump body 1, first diaphragm 14 top is provided with first diaphragm chamber 15, space between first diaphragm chamber 15 and the first diaphragm 14 forms first working chamber 16, first working chamber 16 is through first suction hole 17 and first drainage hole 18 on first diaphragm chamber 15 respectively with first intake chamber 6 and first play water cavity 7 intercommunication, it is provided with first suction hole soft valve piece 19 and first drainage hole soft valve piece 20 respectively to lie in first suction hole 17 and the punishment of first drainage hole 18 on first diaphragm chamber 15.

The output shaft 21 of the second motor 3 is sequentially connected with a second eccentric wheel 22, a second eccentric wheel bearing 23 and a second swing frame 24 from bottom to top, a second diaphragm 25 located in the duplex pump body 1 is connected above the second swing frame 24, a second diaphragm chamber 26 is arranged above the second diaphragm 25, a second working chamber 27 is formed in a space between the second diaphragm chamber 26 and the second diaphragm 25, the second working chamber 27 is respectively communicated with the second water inlet chamber 8 and the second water outlet chamber 9 through a second water suction hole 28 and a second water drain hole 29 on the second diaphragm chamber 26, and a second water suction hole soft valve plate 30 and a second soft water drain hole valve plate 31 are respectively arranged at positions, located on the second water suction hole 28 and the second water drain hole 29, on the second diaphragm chamber 26.

The utility model discloses when using, be connected inhalant canal and outside inlet channel, exhalant canal is connected with outside outlet conduit, switches on the power of first motor and second motor. Because the eccentric wheel on the output shaft of the motor is not concentric with the motor shaft, the eccentric wheel has an eccentric amount, namely the axis of the first/second swing frame has a certain included angle (expressed by alpha) with the output shaft of the first/second motor. Therefore, under the drive of the eccentric wheel, the swing frame reciprocates up and down along with the rotation of the motor, so that the first diaphragm and the second diaphragm reciprocate up and down to deform and move, and the volume of the working cavity is continuously enlarged and reduced. When the diaphragm deforms downwards, the volume of the working cavity is increased, negative pressure is generated in the working cavity, liquid is sucked into the working cavity from the water inlet cavity through the water suction holes, and the water suction hole soft valve piece at the water suction hole is used for preventing the liquid from flowing backwards; when the diaphragm deforms upwards, the volume of the working cavity is reduced, the pressure in the working cavity is increased, liquid is pressed into the water outlet cavity from the working cavity through the water drain hole and enters the water outlet channel to finish the liquid conveying, and the water drain hole soft valve piece at the water drain hole is used for preventing the liquid from flowing backwards.

In prior art membrane pumps, the membrane requires the use of pistons, screws, etc. to achieve the connection to the swing frame. The membrane is provided with a through hole for a screw to pass through, parts such as a sealing gasket are required to be added at the screw and the through hole for preventing the membrane from leaking, and a sealing glue is required to be coated on the screw for preventing the screw from loosening. The prior art is therefore cumbersome to mount the diaphragm and the swing frame, and may leak due to the loose connection. The production cost is high.

In addition, the connection of the membrane to the swing frame in the prior art is a fixed connection and it is necessary to make the connection very tight in order to prevent leakage, i.e. the membrane is rigidly fastened to the swing frame. However, when the diaphragm pump works, the motor output shaft drives the swing frame to rotate, the swing head of the swing frame not only has the same rotation tendency with the motor output shaft, but also has the inclined movement (swing) in the up-down direction, and the diaphragm and the swing frame are rigidly and firmly connected, so the diaphragm can slightly rotate along with the swing head, the diaphragm can be torn, pulled and kneaded, the diaphragm can be greatly torn, pulled and kneaded at the joint (the area of the diaphragm which deforms up and down, namely the working area of the diaphragm) with the swing head, the service life of the diaphragm is short, the diaphragm can often be torn, pulled and kneaded due to the rotation of the swing frame, cracks appear, and the product rejection rate is high.

In order to solve the above problem, as shown in fig. 12-16, the present invention provides a step-shaped blind hole 33 on the lower surface of the working area 32 of the first diaphragm 14 and the second diaphragm 25, the step-shaped blind hole is opened on the lower surface of the diaphragm and does not penetrate through the upper surface of the diaphragm, and the diameter of the opening 34 of the step-shaped blind hole 33 is smaller than the inner diameter 35 of the step-shaped blind hole 33.

The first swing frame 13 and the second swing frame 24 are provided with a plurality of swing heads 36 (generally 3) matched with the first diaphragm 14 and the second diaphragm 25, the top ends of the swing heads 36 are provided with convex parts 37, the diameters of tail ends 38 of the convex parts 37 are larger than the diameters of root parts 39 of the convex parts 37, and the convex parts 37 are inserted into the stepped blind holes 33.

When the diaphragm is made of soft elastic material, the raised part can be conveniently inserted into the step-shaped blind hole, so that the swing frame can be conveniently connected with the diaphragm. In order to connect the swing frame and the diaphragm more conveniently, the diaphragm can be heated to a certain temperature, so that the soft elasticity of the diaphragm is increased, the bulge part is conveniently inserted into the step-shaped blind hole, and then the bulge part and the step-shaped blind hole can be firmly connected by cooling.

After the swing frame and the diaphragm are connected together, the diameter of the opening part of the step-shaped blind hole is smaller than the inner diameter of the step-shaped blind hole, and the diameter of the tail end of the protruding part is larger than the diameter of the root part of the protruding part, so that the swing frame and the diaphragm cannot be separated again when the diaphragm pump works, and the diaphragm is deformed in the up-and-down direction under the driving of the swing frame, so that the volume of a working cavity is changed alternately to suck and discharge liquid.

The inner diameter of the stepped blind hole can be equal to the diameter of the tail end of the convex part, and more preferably, the inner diameter of the stepped blind hole is slightly larger than the diameter of the tail end of the convex part; the diameter of the opening part of the stepped blind hole can be equal to the diameter of the root part of the lug boss, and more preferably, the diameter of the opening part of the stepped blind hole is slightly larger than the diameter of the root part of the lug boss.

The utility model discloses in, only need to inject the step form blind hole of diaphragm with the overhead bellying of swing span and can accomplish being connected of swing span and diaphragm, saved parts such as piston, screw, sealing washer among the prior art, left out sealed gluey process, reduced the use and the installation procedure of part, simple process can not appear owing to connect the seepage that the jail leads to, has reduced manufacturing cost.

And the diaphragm and the swing frame are connected in a mode that the bulge of the swing frame is inserted into the step-shaped blind hole, so that the diaphragm is not rigidly fastened with the swing head, and the phenomena of tearing, pulling and kneading of the diaphragm caused by slight rotation of the diaphragm along with the swing head due to rigid fastening connection in the prior art are avoided. The diaphragm can not slightly rotate along with the swing head when the bulge of the swing head is inserted into the blind hole of the diaphragm, but only the pure diaphragm moves up and down along with the swing head, the stress condition of the diaphragm is obviously improved due to the connection of the structure, the diaphragm is not rubbed and torn, the diaphragm cracking is reduced, and the service life of the diaphragm is greatly prolonged.

The working area of the diaphragm is an area where the diaphragm is bent and deformed up and down, and the diaphragm in the prior art is of a flat structure. The diaphragm thus constructed has an upward deformation and a downward deformation in one operation cycle (one suction and discharge of liquid is completed) when the diaphragm pump is operated. Specifically, the method comprises the following steps: the swinging head moves downwards, and pulls the membrane to deform downwards, so that liquid is sucked; the swinging head moves upwards to push the membrane to deform upwards to finish the liquid spraying, and the membrane has two deformations in opposite directions in one working period. The service life of the mercy piece is greatly influenced by the deformation times, and the service life of the mercy piece is greatly reduced due to the twice deformation in each working period.

In order to solve the above problem, as shown in fig. 12-15, the first diaphragm 14 and the second diaphragm 25 of the present invention have a protruding portion 40 protruding upward or a recessed portion 41 recessed downward at the working area 32, the height of the protruding portion 40 matches with the position of the highest point of the swinging head 36, and the depth of the recessed portion 41 matches with the position of the lowest point of the swinging head 36.

The utility model discloses in, at the diaphragm in the workspace for diaphragm upwards protrusion or undercut, also be for diaphragm ascending predeformation or decurrent predeformation in advance, predeformation's height/degree of depth and swing head move to peak/the position of minimum identical, when swing head moves to the peak promptly, the bulge of diaphragm is in the state of indeformable, when swing head moves to the minimum, the depression of diaphragm is in the state of indeformable. The diaphragm thus constructed has only one downward deformation or one upward deformation in one working cycle.

When the diaphragm has a convex portion protruding upward: the swinging head moves downwards, and pulls the membrane to deform downwards, so that liquid is sucked; the swinging head moves upwards, and the diaphragm is recovered and not deformed, so that the diaphragm is deformed for one time only downwards in one working period, and the deformation times of the diaphragm are reduced by times.

When the diaphragm has a recess depressed downward: the swinging head moves upwards to push the membrane to deform upwards, and liquid is sprayed out; the swinging head moves downwards, and the diaphragm is restored to the original state and is not deformed, so that the diaphragm is deformed for one time upwards in one working period, and the deformation times of the diaphragm are reduced by times.

It can be seen that, the utility model discloses the deformation number of times of reduction the diaphragm at double, because the fatigue limit number of times of bending of diaphragm is certain, consequently the utility model discloses the life-span of bending of extension diaphragm that can double.

As shown in fig. 15, a more preferable modification is: the height of the protrusion 40 gradually increases along the direction from the center to the outer periphery of the first diaphragm 14 and the second diaphragm 25, so that the protrusion 40 is inclined upward along the direction from the center to the outer periphery of the first diaphragm 14 and the second diaphragm 25 by a first angle α, which is equal to the angle between the axis of the first/

second swing frame

13, 24 and the

output shaft

10, 21 of the first/second motor.

Because the motion of the swing head in the up-and-down direction is not parallel motion but up-and-down swing, when the swing head moves to the highest point position, the outer side (the side close to the periphery of the diaphragm) of the swing head is high, the inner side (the side close to the center of the diaphragm) is low, an inclined angle with the high outer side and the low inner side exists on the upper surface of the swing head, and the inclined angle is equal to the included angle between the axis of the swing frame and the output axis of the motor according to the geometric relation. In order to make the bulge identical with the overhead surface of swing when the swing head moves to the peak position, the utility model discloses also incline the same angle with the bulge, swing head and diaphragm fully contact like this, improved the area of diaphragm deformation part, improved working chamber volume expansion rate to improve the self priming performance of diaphragm pump.

Alternatively, as shown in fig. 14, the depth of the recess 41 gradually increases in the direction from the center to the outer periphery of the first diaphragm 14 and the second diaphragm 25, so that the recess 41 is inclined downward by a first angle α, which is equal to the angle between the axis of the first/

second swing frame

13, 24 and the

output shaft

10, 21 of the first/second motor, in the direction from the center to the outer periphery of the first diaphragm 14 and the second diaphragm 25.

Similarly, because the motion of the oscillating head in the up-and-down direction is not parallel motion, but up-and-down swing, when the oscillating head moves to the lowest point position, the outer side (the side close to the periphery of the diaphragm) of the oscillating head is low, the inner side (the side close to the center of the diaphragm) is high, an inclined angle with the outer side low and the inner side high exists on the upper surface of the oscillating head, and the inclined angle is equal to the included angle between the axis of the oscillating frame and the output axis of the motor according to the geometric relationship. In order to make the depressed part identical with the overhead surface of swing when the head that swings moves to minimum point position, the utility model discloses also incline the same angle with the depressed part, swing head and diaphragm fully contact like this, improved the area of diaphragm deformation part, improved working chamber volume expansion rate to improve the self priming performance of diaphragm pump.

In order to facilitate the installation of the diaphragms, a first diaphragm support 42 and a second diaphragm support 43 are respectively arranged below the first diaphragm 14 and the second diaphragm 25, and a first motor cover 44 and a second motor cover 45 are respectively arranged on the upper portions of the first motor 2 and the second motor 3.

The first motor cover 44 and the second motor cover 45 are connected with the bottom of the duplex pump body 1, the first eccentric wheel 11 and the first eccentric wheel bearing 12 are located in the first motor cover 44, and the first swing frame 13 is located in a space formed by the first motor cover 44 and the duplex pump body 1 together. The second eccentric wheel 22 and the second eccentric wheel bearing 23 are positioned in the second motor cover 45, and the second swing frame 24 is positioned in a space formed by the second motor cover 45 and the duplex pump body 1.

The working area 32 of the first diaphragm 14 and the second diaphragm 25 is provided with a thickened area 46 with the upper surface thickened upwards, and the stepped blind hole 33 is arranged on the thickened area 46.

The front end of the water inlet channel 4 is provided with a water inlet 47 for connecting with an external pipeline, and the rear end of the water outlet channel 5 is provided with a water outlet 48 for connecting with an external pipeline.

The thickened area is not only used for setting up step form blind hole to, the thickened area can also replace original piston structure, is convenient for occupy and fill the working chamber, and working chamber volume expansion rate when improving the diaphragm and removing downwards improves the self priming performance of diaphragm pump. Preferably, the convex profile of the thickened region is adapted to the profile of the working chamber.

In order to facilitate the connection of the step-shaped blind hole and the convex part, the inner diameter of the step-shaped blind hole is gradually reduced along the direction from the opening part of the step-shaped blind hole to the inner part of the step-shaped blind hole. Correspondingly, along the root of bellying to the terminal direction of bellying, the terminal diameter of bellying reduces gradually, is convenient for insert the bellying step-like blind hole.

The utility model discloses need strictly guarantee the intake antrum and blow the strong sealed isolation of water, specific sealed isolation mode is as follows:

the first water inlet chamber 6 and the first water outlet chamber 7 are separated by a first diaphragm chamber 15 and a circular first partition plate 49, and a first sealing washer 50 is arranged between the first partition plate 49 and the first diaphragm chamber 15.

The second water inlet cavity 8 and the second water outlet cavity 9 are separated by a second diaphragm chamber 26 and a circular second partition plate 51, and a second sealing washer 52 is arranged between the second partition plate 51 and the second diaphragm chamber 26.

In an example of the present invention, the water inlet channel 4 is located below the water outlet channel 5, and the first water inlet chamber 6 and the second water inlet chamber 8 are communicated with the water inlet channel 4 through the opening 53 formed below the water inlet channel.

The first water outlet chamber 7 is communicated with the water outlet channel 5 through a water outlet pipe 54, the water outlet pipe 54 crosses the water inlet channel 4 from both sides of the water inlet channel 4 and is upwardly connected with the water outlet channel 5, and the second water outlet chamber 9 is communicated with the water outlet channel 5 through a water outlet 55 arranged above the annular second partition plate 51.

The first water suction hole soft valve plate 19, the first water discharge hole soft valve plate 20, the second water suction hole soft valve plate 30 and the second water discharge hole soft valve plate 31 each include an inverted cone-shaped joint 56 connected to the first diaphragm chamber 15 or the second diaphragm chamber 26 and a circular sheet portion 57 fitted to the first water suction hole 17, the first water discharge hole 18, the second water suction hole 28 or the second water discharge hole 29.

The first water suction hole soft valve plate 19, the first water discharge hole soft valve plate 20, the second water suction hole soft valve plate 30 and the second water discharge hole soft valve plate 31 may be made of rubber.

When the water outlet channel is blocked or a pipeline connected with the water outlet pipeline is blocked, the diaphragm pump pumps liquid into the water outlet channel all the time, so that the water pressure in the water outlet channel is increased, and if no protective measures are taken, the diaphragm pump or other externally connected equipment can be damaged. The utility model limits the water pressure of the water outlet pipeline through the pressure-limiting overflow device or the pressure-limiting power-off device.

As shown in fig. 2 and 4, the pressure-limiting overflow device 58 is preferably located above the first water outlet cavity, the pressure-limiting overflow device 58 includes a first pressure-limiting cavity 59 communicated with the water outlet channel 5 and a return hole 60 communicated with the water inlet channel 4, the first pressure-limiting cavity 59 is located around the return hole 60, a first sealing gasket 61 for hermetically isolating the first pressure-limiting cavity 59 from the return hole 60 is disposed at the top end of the return hole 60 and the first pressure-limiting cavity 59, a first spring sleeve 62 is disposed at the top of the first sealing gasket 61, a first guide ring 63 is sleeved around the first spring sleeve 62, a first spring 64 is disposed in the first spring sleeve 62, a first spring seat 65 is disposed at the top end of the first spring 64, and a first pressure-regulating screw 67 mounted on the pressure-regulating top cover 66 is disposed at the top end of the first spring seat 65.

When the water pressure of the water outlet pipeline reaches a certain value, the high-pressure liquid in the first pressure limiting cavity generates upward pressure on the first sealing gasket, the first sealing gasket deforms upwards, so that the seal between the first pressure limiting cavity and the backflow hole is opened, and the liquid enters the water inlet channel from the water outlet pipeline through the first pressure limiting cavity and the backflow hole, so that the purpose of pressure limiting is achieved. When the blockage fault is eliminated, the water pressure of the water outlet channel is reduced, the first sealing gasket and the first spring sleeve reset under the pressure of the first spring, the first pressure limiting cavity and the backflow hole are sealed again, and liquid does not flow back any more.

The first guide ring is used for guiding the up-and-down movement of the first spring sleeve, a space for the first sealing gasket to deform is reserved at the lower part of the first guide ring, and the first spring seat and the first pressure regulating screw are used for regulating the tightness of the first spring.

As shown in fig. 10 and 11, the pressure-limiting power-off device 68 is preferably located above the first water outlet cavity, the pressure-limiting power-off device 68 includes a second pressure-limiting cavity 69 communicated with the water outlet channel 5, a second sealing gasket 70 is disposed at the top end of the second pressure-limiting cavity 69, a second spring sleeve 71 is disposed at the top of the second sealing gasket 70, a second guide ring 72 is sleeved around the second spring sleeve 71, a second spring 73 is disposed in the second spring sleeve 71, a second spring seat 74 is disposed at the top end of the second spring 73, and a contact 77 of a microswitch 76 is disposed above a top flange 75 of the second spring sleeve 71.

When the water pressure of the water outlet channel reaches a certain value, the high-pressure liquid in the second pressure limiting cavity generates upward pressure on the second sealing gasket, the second sealing gasket deforms upwards to push the second spring sleeve to move upwards for a certain distance, the top flange of the second spring sleeve presses a contact of the microswitch, the microswitch enables the circuit to be disconnected and electrified, the motor stops running, and the water pressure in the water outlet channel is limited within a certain range to prevent equipment from being damaged. When the blockage fault is eliminated, the water pressure of the water outlet channel is reduced, the second sealing gasket and the second spring sleeve are reset under the pressure of the second spring, the contact of the microswitch is reset, and the motor starts to operate again.

The second guide ring is used for guiding the up-and-down movement of the second spring sleeve, and a space for the deformation of the second sealing gasket is reserved at the lower part of the second guide ring.

The first motor 2 and the second motor 3 are arranged on the motor base 78, and the motor base 78 is provided with a plurality of damping feet 79.

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

1. The utility model provides a diaphragm pump which characterized in that, includes the duplex pump body of integrative structure and sets up side by side first motor and the second motor of duplex pump body below, wherein:

2. The diaphragm pump according to claim 1, wherein the lower surfaces of the working areas of the first and second diaphragms are provided with stepped blind holes, the opening portion of the stepped blind holes having a diameter smaller than the inner diameter of the stepped blind holes; the first swing frame and the second swing frame are provided with swing heads, the top ends of the swing heads are provided with protruding portions, the diameters of the tail ends of the protruding portions are larger than the diameters of the roots of the protruding portions, and the protruding portions are inserted into the step-shaped blind holes.

3. The diaphragm pump of claim 2 wherein the first and second diaphragms have an upwardly convex protrusion or a downwardly concave depression at the working area, the height of the protrusion corresponding to the highest point of the oscillating head movement, and the depth of the depression corresponding to the lowest point of the oscillating head movement.

4. The diaphragm pump of claim 3 wherein the height of the protrusion increases gradually along the direction from the center to the periphery of the first and second diaphragms such that the protrusion is inclined upward along the direction from the center to the periphery of the first and second diaphragms by a first angle equal to the angle between the axis of the first/second swing frame and the output shaft of the first/second motor;

5. The diaphragm pump of claim 4 wherein a first diaphragm support and a second diaphragm support are disposed below the first diaphragm and the second diaphragm, respectively, the working areas of the first diaphragm and the second diaphragm having a thickened area with an upper surface that is thickened upward, the stepped blind hole being disposed on the thickened area; the front end of the water inlet channel is provided with a water inlet used for being connected with an external pipeline, and the rear end of the water outlet channel is provided with a water outlet used for being connected with the external pipeline.

6. The diaphragm pump of claim 1 wherein the first inlet chamber and the first outlet chamber are separated by a first diaphragm chamber and an annular first diaphragm plate, a first sealing gasket being disposed between the first diaphragm chamber and the first diaphragm chamber; the second water inlet cavity and the second water outlet cavity are separated by a second diaphragm chamber and a circular second partition plate, and a second sealing gasket is arranged between the second partition plate and the second diaphragm chamber.

7. The diaphragm pump of claim 6, wherein the inlet channel is located below the outlet channel, and the first inlet chamber and the second inlet chamber are communicated with the inlet channel through an opening formed below the inlet channel; first play water cavity pass through drainage pipe with go out the waterway intercommunication, drainage pipe follows inhalant canal's both sides are crossed inhalant canal and are upwards connected with the exhalant canal, second go out the water cavity through set up in the outlet of annular second baffle top with go out the waterway intercommunication.

8. The diaphragm pump according to claim 7, wherein the first suction hole flexible valve sheet, the first discharge hole flexible valve sheet, the second suction hole flexible valve sheet, and the second discharge hole flexible valve sheet each include an inverted cone-shaped joint connected to the first diaphragm chamber or the second diaphragm chamber and a circular sheet portion fitted to the first suction hole, the first discharge hole, the second suction hole, or the second discharge hole.

9. The diaphragm pump according to any one of claims 1 to 8, wherein a pressure limiting overflow device is further arranged in the duplex pump body, the pressure limiting overflow device comprises a first pressure limiting cavity communicated with the water outlet channel and a backflow hole communicated with the water inlet channel, the first pressure limiting cavity is located around the backflow hole, a first sealing gasket for sealing and isolating the first pressure limiting cavity and the backflow hole is arranged at the top end of the backflow hole and the first pressure limiting cavity, a first spring sleeve is arranged at the top of the first sealing gasket, a first guide ring is sleeved around the first spring sleeve, a first spring is arranged in the first spring sleeve, a first spring seat is arranged at the top end of the first spring, and a first pressure regulating screw arranged on the pressure regulating top cover is arranged at the top end of the first spring seat.

10. The diaphragm pump according to any of claims 1-8, wherein a pressure limiting and power-off device is further disposed in the duplex pump body, the pressure limiting and power-off device includes a second pressure limiting cavity communicated with the water outlet channel, a second sealing gasket is disposed at a top end of the second pressure limiting cavity, a second spring sleeve is disposed at a top portion of the second sealing gasket, a second guide ring is sleeved around the second spring sleeve, a second spring is disposed in the second spring sleeve, a second spring seat is disposed at a top end of the second spring, and a contact of the micro switch is disposed above a top flange of the second spring sleeve.