CN110725787A

CN110725787A - Diaphragm pump

Info

Publication number: CN110725787A
Application number: CN201911117797.2A
Authority: CN
Inventors: 关勇; 郭书博; 钱云超; 张国华
Original assignee: Artas Technology Suzhou Co Ltd
Current assignee: Artas Technology Suzhou Co Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-01-24

Abstract

The invention discloses a diaphragm pump, which comprises: a pump body having a diaphragm cavity; a first diaphragm forming a portion of a wall of the diaphragm chamber; the second diaphragm is positioned outside the diaphragm cavity and forms a sealed cavity together with the first diaphragm, and sealing liquid is filled in the sealed cavity; the driving device is used for driving the first diaphragm to generate reciprocating deformation; a detection device for detecting whether the first diaphragm is broken. If first diaphragm breaks, the fluid of diaphragm intracavity can flow into sealed intracavity, can not flow the diaphragm pump, consequently just can not cause the influence to operational environment, simultaneously, breaks the back at first diaphragm, can trigger detection device, and the user can learn the diaphragm pump and break down. Even first diaphragm breaks the back, the diaphragm pump still can rely on the second diaphragm to continue to work, and is ready until maintenance preparation work, has both improved work efficiency, also ensures personal and environmental safety.

Description

Diaphragm pump

Technical Field

The present invention relates to a diaphragm pump.

Background

The diaphragm pump is widely applied to various fluid transmission equipment, such as various fluids in the industries of chemical industry, water treatment industry, food, medicine and health industry, mining industry, nuclear power industry and the like.

A diaphragm pump generally includes a driving device and a diaphragm chamber, a diaphragm is disposed between the driving device and the diaphragm chamber, and the driving device is used to drive the diaphragm to perform reciprocating deformation, so that the volume of the diaphragm chamber changes, and thus fluid in the diaphragm chamber is pumped out. In the process of long-term use, the diaphragm can be damaged due to aging, corrosion and the like, so that the problem of liquid leakage is caused, and the threat to the working environment and the working personnel is formed. In particular, in the chemical industry and the dangerous goods conveying industry, once liquid leakage occurs, the consequences are very serious.

At present, although some diaphragm pumps can monitor whether the diaphragm pumps leak in real time, the diaphragm pumps can only send out an alarm under the condition that fluid leaks, leakage can not be avoided from leaking out of the diaphragm pumps, and the problem of environmental pollution caused by leakage can not be solved.

Disclosure of Invention

The invention aims to overcome the defect that liquid leakage is generated due to the breakage of a diaphragm in the prior art, and provides a diaphragm pump.

The invention solves the technical problems through the following technical scheme:

a diaphragm pump, comprising:

a pump body having a diaphragm cavity;

a first diaphragm forming a portion of a wall of the diaphragm chamber;

the second diaphragm is positioned outside the diaphragm cavity and forms a sealed cavity together with the first diaphragm, and sealing liquid is filled in the sealed cavity;

the driving device is used for driving the first diaphragm to generate reciprocating deformation;

a detection device for detecting whether the first diaphragm is broken.

In this scheme, if first diaphragm breaks, the fluid of diaphragm intracavity can flow into sealed intracavity, can not flow the diaphragm pump, consequently just can not cause the influence to operational environment, simultaneously, breaks the back at first diaphragm, can trigger detection device, and the user can learn the diaphragm pump and break down, maintains and changes the diaphragm pump afterwards. Moreover, even if the first diaphragm breaks, the diaphragm pump can still rely on the second diaphragm to continue to work until maintenance preparation work is ready, and for the equipment that uses this diaphragm pump, the damage of first diaphragm is less to its operation influence, both improves work efficiency, also ensures personal and environmental safety.

Preferably, the detection device is communicated with the sealed cavity.

In this scheme, detection device and seal chamber intercommunication are through monitoring the characteristic parameter in the seal chamber and the physics, the chemical property of sealing liquid to judge whether first diaphragm breaks.

Preferably, the detection means comprises a pressure sensor for measuring the pressure within the sealed chamber.

In the scheme, if the first diaphragm is broken, the pressure in the sealing cavity can be changed, and the pressure sensor can send out an alarm after monitoring the change.

Preferably, the detection means comprises an ion concentration detector for measuring an ion concentration of a sealing liquid within the sealing chamber, the sealing liquid having a different ion concentration than the fluid within the diaphragm chamber.

In the scheme, after the first diaphragm is broken, fluid in the diaphragm cavity can enter the sealing cavity, so that the ion concentration in the sealing liquid is changed. For example, the ion concentration detector is an instrument capable of measuring a specific ion concentration, the sealing liquid does not contain the specific ion, and the ion concentration detector is capable of detecting the change when the specific ion in the fluid in the diaphragm chamber enters the sealing chamber after the first diaphragm is broken.

Preferably, the detection means comprises a conductivity detector for measuring the conductivity of a sealing liquid within the sealing chamber, the sealing liquid having a different conductivity than the fluid within the diaphragm chamber.

In this embodiment, when the first diaphragm is broken, the fluid in the diaphragm chamber may enter the sealed chamber, which may cause a change in the conductivity of the fluid in the sealed chamber. For example, the fluid in the diaphragm cavity is a glycol solution, the sealing liquid in the sealing cavity is a sodium hydroxide solution, the detector is a conductivity meter, when the diaphragm is in normal operation, the conductivity in the sealing cavity is low, after the first diaphragm is broken, the conductivity of the fluid in the sealing cavity rises, and the conductivity meter can detect the abnormality, so that whether the first diaphragm is broken or not is judged.

Preferably, the detection device comprises an observation hole communicated with the sealed cavity, and the sealing liquid reacts or is mixed with the fluid in the diaphragm cavity to generate color change.

In this scheme, after first diaphragm breaks, the fluid entering in the diaphragm intracavity makes the sealing liquid take place the color change in the sealed intracavity, and the user can discover this color change through the inspection hole, in time discovers that first diaphragm has broken.

Preferably, the detection device further comprises a observation tube made of transparent material, the observation tube is positioned outside the pump body and is communicated with the sealed cavity.

In this scheme, during sealing liquid can flow to the observation pipe, observation pipe is located the pump body outside, and convenient to use person observes.

Preferably, the observation holes are provided with two and are respectively located at two sides of the sealed cavity, and two ends of the observation tube are respectively connected with one observation hole.

In this scheme, the observation tube head and the tail all communicate in sealed chamber, are favorable to during sealing liquid enters into the observation tube, the user can discover as early as possible that first diaphragm breaks, and the length of observation tube is longer, and is more striking, is convenient for observe.

Preferably, the sealing liquid is an iodine-containing solution, and the fluid in the diaphragm cavity is a solution containing starch;

or the sealing liquid and the fluid in the diaphragm cavity are fluids with different colors.

In the scheme, the iodine solution and the starch solution are subjected to chemical reaction to change color, or after fluids with different colors are mixed, the color can be changed, and a user can judge whether the first membrane is broken according to the color change.

Preferably, the drive means is located on a side of the diaphragm chamber opposite the second diaphragm, the drive means being connected to the second diaphragm.

In the scheme, the driving device drives the first diaphragm to deform in a reciprocating mode by driving the second diaphragm, so that the volume of the diaphragm cavity is changed, and the purpose of pumping fluid is achieved.

Preferably, the drive means comprises a push rod movable in the axial direction, the end of the push rod being connected to the second diaphragm.

In the scheme, the reciprocating motion of the push rod is utilized to drive the second diaphragm to deform in a reciprocating mode.

Preferably, the first diaphragm and the second diaphragm are separated by the sealing liquid without mechanical connection, and the motion of the second diaphragm is transmitted to the first diaphragm through the sealing liquid.

In this scheme, the deformation of second diaphragm is passed through sealed liquid completely and is transmitted for first diaphragm atress is even, avoids making first diaphragm atress uneven because of the mechanical connection transmission, leads to first diaphragm life-span to reduce.

Preferably, two diaphragm cavities are arranged in the diaphragm pump, each diaphragm cavity is correspondingly provided with the first diaphragm and the second diaphragm, and the driving device is located between the two diaphragm cavities to drive the two first diaphragms to generate reciprocating deformation.

In the scheme, the two diaphragm cavities are symmetrically arranged relative to the driving device, and one driving device can be used for driving the volume change of the two diaphragm cavities, so that the utilization rate of the driving device is improved, and the flow of the diaphragm pump is increased.

Preferably, each diaphragm cavity is provided with one sealing cavity correspondingly.

The positive progress effects of the invention are as follows: the diaphragm pump can monitor whether the first diaphragm is broken or not, and through the arrangement of the sealing cavity, conveyed materials cannot leak to the environment outside the pump body from the diaphragm pump after the first diaphragm is broken, so that the threat of the fluid conveyed by the diaphragm pump to users and the environment is avoided, and the diaphragm pump can still keep running after the first diaphragm is broken, so that the downtime can be reduced, and the working efficiency is improved.

Drawings

Fig. 1 is a schematic view of the internal structure of a diaphragm pump according to embodiment 1 of the present invention.

Fig. 2 is a schematic view of the internal structure of a diaphragm pump according to embodiment 2 of the present invention.

Description of the reference numerals

Pump body 100

Diaphragm chamber 10

Sealed chamber 20

First diaphragm 1

Second diaphragm 2

Drive device 3

Push rod 31

Detection device 4

Observation tube 5

First presser plate 6

Second presser plate 7

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

Example 1

Referring to fig. 1, an embodiment 1 of the present invention is shown, in this embodiment, a diaphragm pump includes a pump body 100 having a diaphragm chamber 10, wherein a wall of a portion of the diaphragm chamber 10 is formed by a first diaphragm 1, the diaphragm pump further includes a second diaphragm 2, the second diaphragm 2 is located outside the diaphragm chamber 10 and forms a sealed chamber 20 with the first diaphragm 1, the sealed chamber 20 is isolated from the diaphragm chamber 10, and the sealed chamber 20 is filled with a sealing liquid. The membrane pump is further provided with a driving means 3 and a detecting means 4, the driving means 3 being adapted to drive the first membrane 1 to be deformed reciprocally, the detecting means 4 being adapted to detect whether the first membrane 1 is broken or not.

When the diaphragm pump works, if first diaphragm 1 breaks, the fluid in diaphragm chamber 10 can flow into seal chamber 20, and can not flow out the diaphragm pump, consequently just can not cause the influence to operational environment, simultaneously, after first diaphragm 1 breaks, can trigger detection device 4, and the user can learn that first diaphragm has broken, maintains and changes the diaphragm pump afterwards. Moreover, even first diaphragm 1 breaks the back, the diaphragm pump still can rely on second diaphragm 2 to continue to work, and through reducing down time, reduce because of the influence of first diaphragm 1 breaks to equipment operation, both improved work efficiency, also ensured the personal and environmental safety until maintenance preparation work is ready.

In the present embodiment, the sealed cavity 20 is defined by the first diaphragm 1, the second diaphragm 2, and a portion of the pump body 100. The first diaphragm 1 and the second diaphragm 2 are fixed to the pump body 100 at their edges by bolts.

The detection device 4 is communicated with the sealed cavity 20, if the first diaphragm 1 is damaged, the fluid in the diaphragm cavity 10 can enter the sealed cavity 20, certain physical and chemical parameters in the sealed cavity 20 can be changed, and the detection device can judge whether the first diaphragm 1 is broken or not by monitoring characteristic parameters in the sealed cavity 20 and physical and chemical properties of sealing liquid.

Specifically, in some preferred embodiments, the detecting device 4 includes a pressure sensor, a probe of the pressure sensor is disposed in the sealed cavity 20 and is used for measuring the pressure or the pressure change in the sealed cavity 20, if the first diaphragm 1 is broken, the pressure in the sealed cavity 20 will change, and after the pressure sensor detects the change, the pressure sensor will send an alarm to determine whether the first diaphragm 1 is broken.

In particular, in certain preferred embodiments, the detection means comprises means for measuring a change in conductivity of the sealing fluid within sealed chamber 20, the sealing fluid having a conductivity characteristic opposite to that of the fluid within septum chamber 10, and determining whether additional fluid has entered sealed chamber 20 by monitoring the change in conductivity within sealed chamber 20.

For example, the fluid in the diaphragm chamber 10 is a glycol solution, the sealing liquid in the seal chamber 20 is a sodium hydroxide solution, the detector is a conductivity meter, during normal operation, the conductivity in the seal chamber 20 is low, and after the first diaphragm 1 is broken, the conductivity of the fluid in the seal chamber 20 rises, and the conductivity meter can detect an abnormality, thereby determining whether the first diaphragm 1 is broken.

For another example, the conductivity detector is an instrument capable of measuring the conductivity of the solution, and when the first membrane 1 is ruptured and the opposite polarity fluid in the membrane chamber 10 enters the sealed chamber 20, the ion concentration detector can detect the change.

Specifically, in some embodiments, the fluid in the diaphragm chamber 10 is a propylene glycol solution, the sealing liquid is white oil, and after the first diaphragm 1 is ruptured, the propylene glycol solution enters the sealing chamber 20 to be fused with the white oil, at this time, the conductivity of the mixed solution changes, the buzzer power is turned on, and a user can determine whether the first diaphragm 1 is ruptured according to the buzzer.

In particular, in certain preferred embodiments, the detection means comprises a viewing port 4 in communication with a sealing chamber 20, the sealing fluid reacting or mixing with the fluid in the membrane chamber 10 to produce a color change. When the first diaphragm 1 is broken, the fluid in the diaphragm cavity 10 enters the sealing cavity 20 to make the sealing liquid generate color change, and a user can find the color change through the observation hole 4 to find that the first diaphragm 1 is broken in time.

Further, the detection device further comprises a viewing tube 5 made of transparent material, the viewing tube 5 being located outside the valve body 100 and communicating with the sealed chamber 20. The sealing liquid can flow into the observation tube 5, and the observation tube 5 is positioned outside the pump body 100 and is convenient for a user to observe.

In a preferred embodiment, two observation holes 4 are provided and located at two sides of the sealed cavity 20, and two ends of the observation tube 5 are connected to one observation hole 4. The observation tube 5 is communicated with the sealing cavity 20 from head to tail, so that sealing liquid can enter the observation tube 5, a user can find that the first membrane 1 is broken as early as possible, and the observation tube 5 is longer in length, more striking and convenient to observe.

Specifically, in some embodiments, the fluid in the membrane chamber 10 is a solution containing starch, the sealing liquid is an iodine-containing solution, and when the first membrane 1 is ruptured, the starch solution enters the sealing chamber 20 to chemically react with the iodine solution to change color, so that a user can determine whether the first membrane 1 is ruptured according to the color change.

In certain other embodiments, the sealing fluid and the fluid within membrane chamber 10 do not react, but are different colored fluids. For example, the fluid in the diaphragm chamber 10 is blue copper sulfate solution, the sealing liquid is water, and when the first diaphragm 1 is broken, the fluid in the observation tube 5 changes from colorless to blue; alternatively, the fluid in the diaphragm chamber 10 is green oily fluid, the sealing liquid is white oily fluid, and after the first diaphragm 1 is broken, the fluid in the observation tube 5 changes from white to green.

Preferably, the sealing liquid is selected to match the properties of the fluid in the diaphragm chamber 10 to reduce the adverse effect of the sealing liquid after entering the diaphragm chamber 10, e.g., if the fluid in the diaphragm chamber 10 is an oily liquid, the sealing liquid should also be an oily liquid; if the liquid within the diaphragm chamber 10 is an aqueous liquid, then the sealing liquid should also be an aqueous liquid; if the liquid in diaphragm chamber 10 is a food product, the sealing liquid should also be a non-hazardous liquid. One skilled in the art may select a suitable sealing liquid accordingly, depending on the fluid within diaphragm chamber 10.

It should be noted that the detection device in the present application is not limited to the pressure sensor, the conductivity detector, the observation hole 4, the observation tube 5, and the like, and those skilled in the art can select an appropriate detection device according to actual situations, and can use various detection devices alone or in any combination to achieve a better detection effect.

The drive means 3 are located at a side of the diaphragm chamber 10 opposite the second diaphragm 2, the drive means 3 being connected to the second diaphragm 2. The driving device 3 drives the first diaphragm 1 to reciprocate by driving the second diaphragm 2, so that the diaphragm cavity 10 changes in volume, and the purpose of pumping fluid is achieved. The invention is not limited to the position of the driving means 3, and the skilled person can arrange the driving means 3 according to the actual situation.

In the present embodiment, the driving device 3 includes a push rod 31 capable of moving along the axial direction, one end of the push rod 31 is connected to the second diaphragm 2, and the other end is connected to a power source, the power source can drive the push rod 31 to move, and the power source can be driven by air, electricity or hydraulic pressure. The reciprocating motion of the push rod 31 drives the second diaphragm 2 to deform reciprocally. In the present embodiment, a first pressing plate 6 is disposed in the sealed cavity 20, an end of the push rod 31 is connected to the first pressing plate 6 (e.g., screwed), and a second pressing plate 7 is disposed on the other side of the second diaphragm 2 opposite to the first pressing plate 6, so that the second diaphragm 2 is connected to the push rod 31.

Preferably, the first diaphragm 1 and the second diaphragm 2 are separated by sealing liquid without mechanical connection, the sealing cavity 20 is filled with the sealing liquid, and the deformation of the second diaphragm 2 is completely transmitted to the first diaphragm 1 through the sealing liquid, so that the second diaphragm 2 is uniformly stressed, and the problem that the service life of the second diaphragm 2 is reduced due to uneven stress of the second diaphragm 2 caused by mechanical connection transmission is avoided.

In a preferred embodiment, the volume of the sealed chamber 20 is 100 to 20000mL, and the sealed chamber 20 can be applied to a diaphragm pump with a large flow rate, and in a more preferred embodiment, the volume is 200 to 19000 mL.

Example 2

As shown in fig. 2, the embodiment 2 of the present invention is basically the same as the embodiment 1, except that: the diaphragm pump is provided with two diaphragm cavities 10, each diaphragm cavity 10 is correspondingly provided with a first diaphragm 1 and a second diaphragm 2, and a driving device 3 is positioned between the two diaphragm cavities 10 to drive the two first diaphragms 1 to generate reciprocating deformation. The two diaphragm chambers 10 are symmetrically arranged relative to the driving device 3, and the volume change of the two diaphragm chambers 10 can be driven by using one driving device 3, so that the utilization rate of the driving device 3 is improved, and the flow rate of the diaphragm pump is increased.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. A diaphragm pump, characterized in that the diaphragm pump comprises:

a pump body having a diaphragm cavity;

a first diaphragm forming a portion of a wall of the diaphragm chamber;

a detection device for detecting whether the first diaphragm is broken.

2. The diaphragm pump of claim 1 wherein said sensing means is disposed in communication with said sealed chamber.

3. The diaphragm pump of claim 2, wherein said sensing means comprises a pressure sensor for measuring the pressure within said sealed chamber.

4. The diaphragm pump of claim 2 wherein said sensing means comprises an ion concentration detector for measuring the ion concentration of a sealing fluid within said sealing chamber, said sealing fluid having a different ion concentration than the fluid within said diaphragm chamber.

5. The diaphragm pump of claim 2 wherein said sensing means comprises an electrical conductivity detector for measuring the electrical conductivity of a sealing fluid within said sealing chamber, said sealing fluid having a different electrical conductivity than a fluid within said diaphragm chamber.

6. The diaphragm pump of claim 2 wherein said sensing means comprises a sight glass in communication with said sealing chamber, said sealing fluid reacting or mixing with fluid in said diaphragm chamber to produce a color change.

7. The diaphragm pump of claim 6, wherein said sensing device further comprises a sight tube made of a transparent material, said sight tube being located outside the pump body and in communication with said sealed chamber.

8. The diaphragm pump of claim 7 wherein said sight glass is provided in two and is located on either side of said sealed chamber, and wherein said sight glass is connected at each end to one of said sight glasses.

9. The diaphragm pump of claim 6 wherein said sealing fluid is an iodine-containing solution and said fluid in said diaphragm chamber is a starch-containing solution;

10. The diaphragm pump of claim 1, wherein said drive means is located on a side of said diaphragm chamber opposite said second diaphragm, said drive means being connected to said second diaphragm.

11. The diaphragm pump of claim 1 wherein said drive means comprises an axially movable push rod, an end of said push rod being connected to said second diaphragm.

12. The diaphragm pump of claim 1 wherein said first diaphragm is separated from said second diaphragm by said sealing fluid without creating a mechanical connection, and wherein movement of said second diaphragm is transmitted to said first diaphragm by said sealing fluid.

13. The diaphragm pump according to any of claims 1-12, wherein two of said diaphragm chambers are provided in said diaphragm pump, each of said diaphragm chambers being provided with a corresponding one of said first diaphragm and said second diaphragm, said drive means being located between said two diaphragm chambers for driving said first diaphragms to reciprocally deform.

14. The diaphragm pump of claim 13, wherein one said seal chamber is provided for each said diaphragm chamber.