KR20190020457A - Diaphragm pump - Google Patents

Abstract

The present invention relates to a diaphragm pump assembly with which pressure in a pumping chamber is changed to sequentially open and close a check valve of a suction unit and a discharge unit so that a fluid can be sucked and then discharged. More specifically, the diaphragm pump assembly has a diaphragm comprising: a dome unit having a diameter smaller than that of the pumping chamber to enable the dome unit to be inserted into each pumping chamber, protruding to an upper portion, and allowing a bolt coupling hole to be penetrated into a center; a bolt inserted into the bolt coupling hole to enable the diaphragm to be coupled to a pressure plate; a storage groove concavely formed on an upper surface of the dome unit to store the head of a bolt; and a sealing protrusion protruding upward from the bottom surface of the storage groove around the circumference of the bolt coupling hole and coming in close contact with the head. Therefore, assemblability and airtightness can be increased.

Description

Diaphragm pump assembly {DIAPHRAGM PUMP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm pump assembly for opening and closing a check valve of a suction unit and a discharge unit by sequentially changing a pressure in a pumping chamber using a diaphragm, A dome portion protruding upward and having a diameter smaller than that of the pumping chamber and having a bolt coupling hole formed at a center thereof; a bolt inserted into the bolt coupling hole to engage the diaphragm and the pressing plate; And a diaphragm which includes a receiving groove for receiving the head and a sealing jig projecting upwardly from the bottom surface of the receiving groove along the circumference of the bolt coupling hole and closely contacting the head of the bolt to thereby improve the assembling property and the airtightness, Pump assembly.

Generally, a diaphragm pump uses a diaphragm having elasticity to change a volume in a chamber to form a suction and discharge pressure of a fluid to pump the fluid. The diaphragm pump includes a metal diaphragm composed of a superalloy such as a cobalt or nickel group, A non-metallic diaphragm is used.

As a related art related thereto, there is disclosed in Japanese Patent Laid-open No. 10-2015-0085791,

In the prior art, a pumping piston is additionally provided above a piston portion of a diaphragm, and a bolt is coupled to a circular fin that moves up and down the diaphragm through the pumping piston and the piston portion. The pumping piston includes a circular pin The pumping piston seals the coupling hole of the diaphragm, which is bolted to the circular pin of the mount, so as to provide airtightness, so that fluid is pumped out of the diaphragm during pumping operation .

By adopting the double plate structure composed of the pumping piston and the diaphragm, it is possible to firmly assemble parts and assure the airtightness of the parts, but there is a disadvantage that the manufacturing cost is increased due to the addition of parts and the assemblability is poor.

Further, due to the repeated elastic deformation of the diaphragm, there is a risk that the piston or the coupling hole of the diaphragm in which the pumping piston is assembled is abraded and the fluid is leaked.

Particularly, as can be seen from the prior art, when a portion of the diaphragm is continuously raised and lowered by a cam member rotated by a motor, and the pressure of each pumping chamber is sequentially changed to suck and discharge fluid, There is a risk that the airtightness is lost due to the breakage of the joint where the bolt is joined when the shape is displaced.

Accordingly, the present invention has been made to solve the above-mentioned problems,

A dome portion inserted into each of the pumping chambers and formed with a bolt coupling hole penetrating through the diaphragm and the pressure plate to secure the assembling property and manufacturing convenience while ensuring airtightness, A bolt which is inserted into the bolt coupling hole and engages the diaphragm and the pressurizing plate, a receiving groove formed in the upper surface of the dome to receive the head of the bolt, And a diaphragm including a sealing jaw which is in close contact with the head.

In addition, the present invention can improve the suction and discharge of the fluid, especially the discharge pressure of the fluid and improve the fluidity of the fluid, thereby ensuring a high-pressure pumping pressure and, more precisely, opening and closing the second check valve of the discharge hole A plurality of discharge holes provided in the fitting hole provided in the inner corner and the outer arc portion are formed so as to be inclined downwardly inward with the fan shaped discharge portion having the inner edge, And a second check valve which is provided at an inner edge of the closing membrane and the opening of the opening and is formed as a fitting protrusion that is fitted in the fitting hole.

In order to smoothly open and close the opening / closing membrane while firmly fixing the second check valve, the second check valve is protruded downward from the center of the discharge passage of the upper housing toward the fitting hole to press the inner edge of the second check valve And a fixing pin for fixing the diaphragm pump assembly to the diaphragm pump assembly.

Further, in order to ensure the airtightness between the upper housing and the chamber housing, a sealing jaw protruding downward is provided inside the outer wall forming the receiving portion of the upper housing, and a packing ring is provided between the upper rim of the chamber housing and the sealing jaw The present invention provides a diaphragm pump assembly that is assembled and fitted to a pump housing.

In order to achieve the above object, a diaphragm pump assembly according to the present invention comprises:

An upper housing having a flow path through which the sucked fluid is discharged;

A chamber housing coupled to a lower portion of the upper housing and having a plurality of pumping chambers radially arranged, the chamber housing having an outer suction portion connected to the flow path of the flow path and an inner discharge portion connected to the discharge path of the flow path;

A valve member comprising a first check valve for opening and closing the suction portion, and a second check valve for opening and closing the discharge portion;

A diaphragm coupled to a lower portion of the chamber housing to shield the pumping chamber, and sequentially opening and closing each check valve by varying a pressure in the pumping chamber to form a pumping pressure in the pumping chamber; And

And a pressure plate for moving the diaphragm up and down,

The diaphragm includes a dome portion protruding upward and having a diameter smaller than that of the pumping chamber so as to be insertable into each of the pumping chambers and having a bolt coupling hole formed at the center thereof, a bolt inserted into the bolt coupling hole and coupling the diaphragm and the pressure plate, And a sealing jaw which protrudes upward along the circumference of the bolt coupling hole on the bottom surface of the receiving groove and is brought into close contact with the head of the bolt, characterized by comprising a receiving groove formed in the upper surface of the dome to receive the head of the bolt, .

In the diaphragm pump assembly according to the present invention,

Wherein the discharge portion comprises a fitting hole formed in an inner corner portion and a plurality of discharge holes formed in an outer arc portion and communicating with the pumping chamber,

Wherein the second check valve is formed in a fan shape corresponding to the discharge portion and comprises an opening closing film covering the plurality of discharge holes and a fitting projection projecting downward from an inner corner portion of the opening closing film to be fitted into the fitting hole .

In the diaphragm pump assembly according to the present invention,

And the upper housing includes a fixing pin protruding downward from the center of the discharge path toward the fitting hole to press and fix the inner edge of the second check valve.

Further, in the diaphragm pump assembly according to the present invention,

The upper housing has a sealing jaw having an inner wall of the upper housing and a lower wall protruding downward along an outer wall of the upper housing, the chamber housing having a receiving portion for receiving the diaphragm,

And a packing ring sandwiched between an upper surface rim of the chamber housing and the sealing jaw.

In the diaphragm pump assembly according to the present invention,

A separate coupling part for joining the diaphragm and the pressure plate is omitted, thereby reducing the manufacturing cost, securing the assemblability and manufacturing convenience,

Not only the direction of the pressing force is switched to the dome portion of the diaphragm but also the airtightness is secured through the close contact of the sealing jaw and the bolt to prevent the fluid from leaking to the bolt coupling hole of the diaphragm,

The second check valve is precisely opened and closed while the pumping pressure is improved by improving the flow of the fluid through the discharge portion and the second check valve inclined downward inwardly corresponding to the shape displacement of the diaphragm,

The second check valve is fixed through the fixing pin of the upper housing to assure convenient assembly and engagement stability of the second check valve which is difficult to adopt a bolt coupling structure,

The leakage of the fluid generated by the pumping pressure can be completely blocked and prevented through the double sealing structure of the upper housing and the chamber housing using the sealing jaw and the packing ring.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is an overall external perspective view of a diaphragm pump assembly according to the present invention. FIG.
1B is a sectional view of an upper housing according to the present invention;
FIG. 2 is a perspective view of a main part of a diaphragm pump assembly according to the present invention. FIG.
Figure 3 is an exploded perspective view of Figure 2;
Fig. 4 is an engaging cross-sectional view of Fig.
5 is a cross-sectional view illustrating a coupling structure of the chamber housing and the first check valve of the present invention.

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

 In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

It is to be understood that the first to second aspects described in the present specification are merely referred to in order to distinguish between different components and are not limited to the order in which they are manufactured, It may not match.

In describing the diaphragm assembly according to the present invention, for the sake of convenience, the approximate direction reference may be specified with reference to FIGS. 2 and 3. For example, when the direction in which gravity acts is the downward direction, Unless otherwise specified in the description and the claims of the invention relating to the drawings, the directions are specified in accordance with this standard.

Hereinafter, a diaphragm pump assembly according to the present invention will be described with reference to the accompanying drawings.

The present invention relates to a diaphragm pump assembly for varying the pressure in a pumping chamber using a diaphragm to sequentially open and close check valves of a suction unit and a discharge unit to suck and discharge a fluid,

As shown in FIGS. 1A to 5, a valve body 40 is provided in a substantially upper housing 10, a chamber housing 20, a lower housing 30, a valve member 40, a diaphragm 50, a pressure plate 60, 70).

The upper housing 10 has an inlet 11 at one side and an outlet 12 at the other side and an inlet 11 and an outlet 12 An inlet path 13 and an outlet path 14 are provided.

Particularly, the inflow passage 13 and the discharge passage 14 of the upper housing 10 are concentrically arranged on the inside and outside in a circular shape so that the inflow port 13 is connected to the inflow passage 13, The inlet passage 13 and the discharge passage 14 are connected to the chamber housing 20 and the diaphragm 50 which communicate with the lower receiving portion 15 and are accommodated in the receiving portion 15, Respectively.

1B, reference numeral 14A denotes a duct which passes through the outer inflow passage 13 and connects the inner discharge passage 14 and the discharge port 12. FIG.

Although not shown in the drawing, the inlet 11 and the outlet 12 may be provided with a fitting capable of fixing a tubular body such as a hose by teeth.

The upper housing 10 is provided with a sealing jaw 17 protruding downward along the outer wall inside the outer wall forming the receiving portion 15,

And a packing ring 18 sandwiched between the sealing jaw 17 and the top edge of the chamber housing 20 (that is, a portion surrounding all of the outer surfaces of the respective suction portions 21)

The diaphragm 50 which is in close contact with the inner wall surface of the chamber housing 20 and the packing ring 18 form a double sealing structure to prevent the fluid sucked into the pumping chamber 23 from leaking to the outside.

The chamber housing 20 is coupled to a lower portion of the upper housing 10 and particularly to a receiving portion 15 and includes an outer suction portion 21 connected to the flow path 13, And a plurality of pumping chambers 23 each having an inner discharge portion 22 connected to the furnace 14 are circularly arranged.

That is, a plurality of pumping chambers 23 are circularly arranged around the center of the upper housing 10 so that the outer suction portion 21 is connected to the inflow passage 13 of the upper housing 10, The pumping chamber 22 is connected to the discharge passage 14 of the upper housing 10 and the three pumping chambers 23 are arranged in a triangle in the figure.

Particularly, the suction unit 21 is radially arranged around the discharge unit 22 formed at the center of the upper housing 10. Each suction unit 21 has a circular shape, A through hole 21a formed through the upper surface of the chamber housing 20 and a plurality of inflow holes 21b circularly arranged through the upper surface of the chamber housing 20 along the outer periphery of the through hole 21a ,

The discharge passage 14 is provided at the center of the upper housing 10 and each discharge section 22 is formed in a fan shape having an inner corner and the upper surface of the chamber housing 20 And a plurality of discharge holes 22b arranged in an arc shape on the outer circular arc portion through the upper surface of the chamber housing 20,

The inflow hole 21b and the discharge hole 22b are all in communication with the lower pumping chamber 23 and are connected to the inlet 11 and the inflow passage 13 through the inflow hole 21b and the pumping chamber 23, The discharge passage 22b and the discharge passage 14 and the discharge port 12 form one flow path.

The upper surface of the pumping chamber 23 is provided with a concave portion 21c which is formed in a dome-like concave shape extending outward from the through hole 21a so that the first opening / closing membrane 41A of the first check valve 41 And is accommodated in the concave portion 21c.

In addition, the pumping chambers 23 are shielded while the pumping chambers 23 are separated from each other by the diaphragm 50 formed on the lower surface and coupled to the lower portion.

The lower housing 30 is coupled to the lower portion of the upper housing 10 so that the chamber housing 20 and the diaphragm 50 are accommodated in the upper and lower housings 10 and 30.

In the lower housing 30, a plurality of insertion portions 31 corresponding to the pumping chambers 23 are formed so as to penetrate the insertion body 61 projecting from the upper surface of the lower pressing plate 60, And the inner diameter of each insertion portion 31 is formed to be larger than the outer diameter of the insertion body 61 so that the insertion body 61 is inclined in the insertion portion 31 It is possible to descend.

The valve member 40 includes a first check valve 41 for opening and closing the suction unit 21 and a second check valve 42 for opening and closing the discharge unit 22.

The first check valve 41 and the second check valve 41 are disposed in the first check valve 41 so that the fluid flows in the direction from the inflow path 13 to the pumping chamber 23, 42 control the flow of the fluid in the direction from the pumping chamber 23 toward the discharge passage 14. In the figure, the first and second openable membranes 41A, 42A made of a synthetic resin material such as rubber, It is possible to identify the first and second check valves 41 and 42,

The first check valve 41 is coupled such that the first opening closing membrane 41A is disposed inside the pumping chamber 23 and the second check valve 42 is connected to the second opening closing membrane 42A are disposed on the outside of the pumping chamber 23, that is, on the discharge passage 14.

More specifically, the first check valve 41 includes a first opening / closing membrane 41A covering a plurality of the inlet holes 21b in a circular shape corresponding to the suction unit 21, A columnar portion 41B projecting upward from the center of the upper surface of the closing membrane 41A and fitted in the through hole 21a and a cylindrical portion 41B projecting outwardly from the outer peripheral surface of the columnar portion 41B, And a latching portion 41C for fixing the first check valve 41 in combination.

The column portion 41B of the first check valve 41 is extended upward from the engagement portion 41C (i.e., the engagement portion 41C is provided at the intermediate height of the column portion 41B). And a column extending portion 41B 'that can be fitted in the through hole 21a. The latching portion 41C is formed in a conical shape having a smaller width toward the upper side,

The conical engaging portion 41C is forcedly inserted into the through hole 21a while the pillar extending portion 41B 'is inserted into the through hole 21a through the lower opening of the pumping chamber 23, The first check valve 41 is assembled by engaging the engaging portion 41C and the first opening and closing membrane 41A on the upper and lower surfaces of the main body 41. After the assembly, The first check valve 41 of the elastic material can be firmly coupled to the suction unit 21 without using the bolt member of the first embodiment.

The second check valve 42 is formed in a fan shape corresponding to the discharge portion 22 and includes a second open close film 42A covering the plurality of discharge openings 22b and a second open close film 42A And a fitting protrusion 42B protruding downward from an inner corner of the fitting hole 22a and fitted into the fitting hole 22a.

The second check valve 42 has an arc shape at a position corresponding to the inflow hole 21b along the outer arc portion of the second opening closing membrane 42A and a reinforcing portion 42a And the second opening and closing membrane 42A is inserted into the inlet opening 21b to prevent the opening of the inlet opening 21b from being lost or the second opening and closing membrane 42A from being damaged.

Further, in order to firmly couple the second check valve 42 made of elastic material to the discharge portion 22 without using a separate bolt member like the first check valve 41,

The upper housing 10 protrudes downward from the center of the discharge passage 14 toward the fitting hole 22a so that the inner edge of the second check valve 42 And a fixing pin 16 for pressing and fixing the upper face of the formed second closing film 42A.

Particularly, the fixing pin 16 includes a protrusion 16a for pressing and fixing both sides of the fitting protrusion 42B in the upper surface of the second opening film 42A and a groove 16b formed between the protrusions 16a Even when the fixing pin 16 presses and fixes the second check valve 42, when the second opening / closing membrane 42A is elastically deformed while being bent upward, So as not to interfere with the opening operation of the valve 42.

According to the present invention,

When the pressure in the pumping chamber 23 is lowered by the diaphragm 50, a pressing force for sucking into the pumping chamber 23 is generated downward and the first opening and closing membrane 41A is opened in the concave portion 21c At the same time that the inflow holes 21b are opened, the second opening / closing membrane 42A is brought into close contact with the suction unit 21 to close the discharge holes 22b,

Conversely, when the pressure in the pumping chamber 23 rises by the diaphragm 50, a pressing force to be discharged to the outside of the pumping chamber 23 is generated upward, and the second opening / closing membrane 42A is brought into close contact with the concave portion 21c The second openable membrane 42A is opened at the suction part 21 to open the discharge holes 22b,

The fluid sucked into the inlet 11 passes through the inflow passage 13, the inflow hole 21b, the pumping chamber 23, the discharge hole 22b and the discharge passage 14 in this order, (12), and a pumping action is performed on the fluid.

The diaphragm 50 is coupled to the lower portion of the chamber housing 20 to shield the pumping chamber 23 and sequentially open and close the check valves 41 and 42 by varying the pressure in the pumping chamber 23 By forming a pumping pressure in the pumping chamber 23,

The receiving portion 15 of the upper housing 10 is also formed in a triangular shape corresponding to the diaphragm 50 so that the three pumping chambers 23 can be shielded at one time as shown in FIG. .

The diaphragm 50 includes a dome portion 51 having a diameter smaller than that of the pumping chamber 23 so as to be insertable into each of the pumping chambers 23 and protruding upwardly and having a bolt coupling hole 51a formed at the center thereof, A bolt 52 inserted into the bolt coupling hole 51a for coupling the diaphragm 50 and the pressing plate 60 to each other, And a sealing jaw 54 which protrudes upwardly from the bottom surface of the receiving groove 53 and around the bolt coupling hole 51a and is brought into close contact with the head of the bolt 52. [

The dome portion 51 switches the direction of the pressing force generated in accordance with the pressure change in the pumping chamber 23 with the head of the bolt 52 coupled to the receiving portion 15 upwardly and downwardly, ) Or the second check valve 42 can be opened or closed to function as a kind of pressure piston.

The bolt coupling hole 51a passes through the center of the dome 51 and communicates with the bolt coupling hole 61a provided in the insertion body 61 of the pressing plate 60 so that the threaded portion of the bolt 52 is engaged with the bolt- The diaphragm 50 and the insertion body 61 of the pressing plate 60 are coupled to each other by the bolts 52 through the holes 51a and screwed into the bolt fastening holes 61a.

The sealing jaw 54 is annularly protruded on the outer side of the bolt coupling hole 51a and is in close contact with the bottom surface of the bolt 52 when the bolt 52 is fastened to the bolt fastening hole 61a, Tightness between the bolt coupling hole (51) and the bolt coupling hole (51a) is secured to prevent the fluid from leaking to the bolt coupling hole (51a).

The diaphragm 50 having such a structure, as in the conventional diaphragm pump, does not require a pumping piston for bolt connection between the diaphragm and the circular pin of the mount. Therefore, it is possible to reduce manufacturing cost, The diaphragm 50 can be pneumatically sealed by the sealing jaws 54, thereby preventing the leakage of the fluid due to the non-use of the pumping piston. It is effective.

The pressing plate 60 includes a plurality of insertion bodies 61 protruding from the diaphragm 50 so as to be inserted into the insertion portion 31. The insertion body 61 is also inserted Like portions 31 are arranged in a triangular shape.

Each of the insertion bodies 61 is provided with a bolt fastening hole 61a formed at its center so that the threaded portion of the bolt 52 is screwed and a rotation shaft of a motor And a bearing 63 for supporting the cam member 62 in a rolling manner.

The cam member 62 is formed such that the thickness of the outer circumferential surface of the cam member 62 is thicker in the circumferential direction than the inner circumferential surface of the insertion body 61 of the pressing plate 60, The dome portion 51 located in each of the pumping chambers 23 ascends and descends.

That is, when the cam member 62 is formed thicker than the other outer circumferential surface of the other side of the cam member 62, the shaft hole is inclined to one side when the cam member 62 is coupled to the bearing 63. By coupling the motor to the motor housing 70 As the shaft hole is vertically erected, the insertion body 61 of the pressing plate 60 in which the wide portion is positioned protrudes upward from the other insertion bodies 61.

In this state, when the motor rotates, the wide portion of the motor rotates along with the rotation of the motor, and the insertion body 61 moves up to the wide portion and the insertion bodies 61 of the narrow portion except for the wide portion descend , The insertion bodies 61 of the pressing plate 60 are repeatedly moved upward and downward continuously in the form of a swinging wave.

The upward and downward movement of the insertion body 61 causes the dome portion 51 of the diaphragm 50 coupled to each insertion body 61 to move up and down and accordingly the pressure in the pumping chamber 23 The first check valve 41 is opened and the second check valve 42 is closed so that fluid flows into the pumping chamber 23 and the pressure in the pumping chamber 23 is increased by the rise of the dome portion 51 The first check valve 41 is closed and the second check valve 42 is opened to discharge the fluid introduced into the pumping chamber 23.

At this time, each insert body 61 is composed of an inclined surface portion 61A whose inside portion of the lower surface is inclined upward to the inside so that the inner lower surface of the insert body 61 contacts the bearing 63 and / Do not.

In other words, while the cam member 62 is rotated by the motor, the pressing plate 60, i.e., the insertion bodies 61 continue to move up and down in a state of not rotating while being inwardly inclined. It is necessary to form a wide gap between the insertion bodies 61 in order to prevent it from being brought into contact with the rotating cam member 62. In the present invention, Thereby making it possible to downsize the pressure plate 60 and further the entire diaphragm pump assembly.

The motor housing 70 is coupled to the lower portion of the lower housing 30 while receiving the pressing plate 60 to force the upright of the motor. In some cases, the case of the motor itself may be used instead.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it should be understood that various changes, omissions and substitutions can be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. And should be construed as falling within the scope of protection of the present invention.

10: upper housing 11: inlet
12: exhaust port 13: inflow path
14: exhaust passage 15:
16: fixing pin 17: sealing jaw
18: Packing ring
20: chamber housing 21: inlet
21a: Through hole 21b: Inlet hole
22: discharge part 22a:
22b: exhaust hole 23: pumping chamber
30: lower housing 31:
40: valve member 41: first check valve
41A: first membrane 41B:
41C: engaging portion 42: second check valve
42A: second closing membrane 42B: fitting projection
42a:
50: diaphragm 51: dome portion
51a: bolt coupling hole 52: bolt
53: receiving groove 54: sealing jaw
60: pressing plate 61: insertion body
61a: bolt fastening hole 61A:
62: cam member 63: bearing
70: Motor housing

Claims (4)

An upper housing having a flow path through which the inflow fluid is discharged;
A plurality of pumping chambers coupled to a lower portion of the upper housing and having an outer inflow portion connected to the inflow path of the flow path and an inner discharge portion connected to the discharge path of the flow path;
A valve member comprising a first check valve for opening and closing the inlet portion and a second check valve for opening and closing the outlet portion;
A diaphragm coupled to a lower portion of the chamber housing to shield the pumping chamber, and sequentially opening and closing each check valve by varying a pressure in the pumping chamber to form a pumping pressure in the pumping chamber; And
And a pressure plate for moving the diaphragm up and down,

The diaphragm includes a dome portion protruding upward and having a diameter smaller than that of the pumping chamber so as to be insertable into each of the pumping chambers and having a bolt coupling hole formed at the center thereof, a bolt inserted into the bolt coupling hole and coupling the diaphragm and the pressure plate, And a sealing jaw which protrudes upward along the circumference of the bolt coupling hole on the bottom surface of the receiving groove and is brought into close contact with the head of the bolt, characterized by comprising a receiving groove formed in the upper surface of the dome to receive the head of the bolt, .
The method according to claim 1,
Wherein the discharge portion comprises a fitting hole formed in an inner corner portion and a plurality of discharge holes formed in an outer arc portion and communicating with the pumping chamber,
Wherein the second check valve is formed in a fan shape corresponding to the discharge portion and comprises an opening closing film covering the plurality of discharge holes and a fitting projection projecting downward from an inner corner portion of the opening closing film to be fitted into the fitting hole The pump assembly comprising:
3. The method of claim 2,
And the upper housing includes a fixing pin protruding downward from the center of the discharge passage toward the fitting hole to press and fix the inner edge of the second check valve.
4. The method according to any one of claims 1 to 3,
The upper housing has a sealing jaw having an inner wall of the upper housing and a lower wall protruding downward along an outer wall of the upper housing, the chamber housing having a receiving portion for receiving the diaphragm,
Further comprising a packing ring that is sandwiched between an upper rim of the chamber housing and the sealing jaw.

Images