Self-priming diaphragm pump

Abstract

The utility model discloses a self-suction diaphragm pump, and relates to the technical field of diaphragm pumps, the self-suction diaphragm pump comprises a pump head, a valve, a self-suction diaphragm soft rubber sheet, a fixed sheet, a swing frame and a front cover which are coaxially arranged in sequence, the pump head is provided with a water inlet cavity and a water outlet cavity, the valve is matched with the pump head to isolate the water inlet cavity from the water outlet cavity, and the valve is provided with a plurality of valve cavities; the self-absorption diaphragm soft rubber piece is matched with the valve to enable the valve cavity to form a working cavity, the self-absorption diaphragm soft rubber piece is driven by the swing frame, a water inlet communicated with the water inlet cavity and a water outlet communicated with the water outlet cavity are formed in the working cavity, a one-way water inlet diaphragm is arranged at the position of the water inlet, and a one-way water outlet gasket with a plurality of clack bodies is installed on the valve. And the corresponding petal bodies of the one-way water outlet gasket form one-way valves at the corresponding water outlets. The sealing structure is good in sealing performance and compact in structure.

Description

Technical Field

[0001] The present application relates to the technical field of diaphragm pumps, and in particular to a self-priming diaphragm pump. Background Art

[0002] Diaphragm pumps rely on an eccentric motor to drive the diaphragm back and forth, changing the volume of the working chamber to inhale and discharge liquid. When the volume of the working chamber increases, the working chamber is at low pressure, and the working chamber draws liquid from the water inlet chamber; when the volume of the working chamber decreases, the working chamber is at high pressure, and the working chamber discharges liquid into the water outlet chamber, thereby achieving unidirectional pumping of the liquid. Diaphragm pumps have multiple working chambers, each of which operates independently. The working states of each working chamber at the same time are different, with some working chambers at high pressure and some at low pressure at the same time. Diaphragm pumps are generally used in the chemical, textile, pharmaceutical, food and other industries for the transportation, emptying, and filtration of water, other liquids, or chemical products containing strong acids and alkalis. The one-way valve diaphragm structure in a diaphragm pump directly affects its operating reliability. Traditional products mostly use rubber diaphragms in their one-way valve diaphragm structures, which have limited corrosion resistance and need to be replaced frequently. In addition, the existing one-way valve diaphragms are prone to edge tearing during operation (when the concave surface faces the liquid inlet direction) or edge gaps (flat fitting seals are prone to edge warping), resulting in the working chamber being unable to be effectively sealed. Utility Model Content

[0003] In view of this, the present application provides a self-priming diaphragm pump to solve the technical problems of unstable sealing and low durability of existing diaphragm pumps.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A self-priming diaphragm pump comprises a pump head, a valve, a self-priming diaphragm soft rubber sheet, a fixing sheet, a swing frame and a front cover which are coaxially arranged in sequence; the pump head is provided with a water inlet chamber and a water outlet chamber; the valve cooperates with the pump head to isolate the water inlet chamber and the water outlet chamber; the valve is provided with a plurality of valve chambers; the self-priming diaphragm soft rubber sheet cooperates with the valve to form a working chamber in the valve chamber; the self-priming diaphragm soft rubber sheet is driven by the swing frame; a water inlet communicating with the water inlet chamber and a water outlet communicating with the water outlet chamber are provided in the working chamber; a one-way water inlet diaphragm is provided at the water inlet; a one-way water outlet gasket having multiple petals is installed on the valve; the corresponding petals of the one-way water outlet gasket form a one-way valve at the corresponding water outlet.

[0006] Furthermore, the one-way water inlet diaphragm and the one-way water outlet gasket are both made of tetrafluoroethylene.

[0007] Furthermore, a plurality of limiting grooves distributed in a radial shape are provided on the edge of the one-way water outlet gasket to form a multi-petal body, and a limiting protrusion cooperating with the limiting grooves is provided on the valve.

[0008] Further, the end surface of the valve matched with the one-way water outlet gasket is concave.

[0009] Further, the one-way water inlet diaphragm is in the shape of an umbrella, and the water inlet is provided with a concave arc surface matched with the one-way water inlet diaphragm.

[0010] Further, the one-way water inlet diaphragm is provided with an annular notch groove on the side edge away from the valve.

[0011] Further, the limiting end plate of the fixed diaphragm screw connected with the swing frame is sleeved with the matched cavity on the end surface of the self-suction diaphragm soft rubber sheet.

[0012] From the above technical solution, the advantages of the present application are:

[0013] 1. In the present application, the one-way water outlet gasket with multiple petals is used for one-way sealing, and compared with the diaphragm pump using multiple one-way water outlet gaskets, the structure is compact, the leakage points are reduced by reducing the mounting and fixing positions of the gaskets, and the sealing performance is good.

[0014] 2. In the present application, the one-way water outlet gasket is matched with the concave end surface, and the one-way water inlet diaphragm is matched with the concave arc surface, the liquid pressure in the concave cavity is used to make the one-way water outlet gasket and the end surface and the one-way water inlet diaphragm and the concave arc surface fit more reliably, and the sealing performance is better.

[0015] 3. In the present application, the one-way water inlet diaphragm and the one-way water outlet gasket are made of tetrafluoroethylene material, which has the characteristics of acid and alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents, so that the service life of the one-way water inlet diaphragm and the one-way water outlet gasket is long, and the replacement frequency is reduced.

[0016] 4. In the present application, the limiting end plate of the fixed diaphragm screw is sleeved with the matched cavity on the self-suction diaphragm soft rubber sheet to realize the connection of the swing frame and the self-suction diaphragm soft rubber sheet, compared with the connection mode that the screw penetrates through the self-suction diaphragm soft rubber sheet, the fixed diaphragm screw does not penetrate through the self-suction diaphragm soft rubber sheet, the leakage probability is reduced, and the corrosion of the medium to the front cover and the swing frame is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitations on the present application.

[0018] Figure 1 The split structure of the present application is shown Figure 1 .

[0019] Figure 2 The split structure of the present application is shown Figure 2 .

[0020] Figure 3Position structure schematic diagram of the valve and the one-way water outlet gasket of the present application.

[0021] Figure 4 Position structure schematic diagram of the valve and the one-way water inlet diaphragm of the present application.

[0022] Figure 5 Structure schematic diagram of the one-way water inlet diaphragm of the present application.

[0023] Figure 6 Structure schematic diagram of the fixed diaphragm screw of the present application.

[0024] Explanation of reference numerals: 1 - reflux valve cover; 2 - pump head; 21 - ring cylinder; 3 - one-way water outlet gasket; 31 - limiting clamping groove; 4 - valve; 41 - boss; 42 - clamping groove; 44 - limiting clamping convex; 45 - water outlet; 46 - water inlet; 47 - valve cavity; 48 - concave surface; 5 - one-way water inlet diaphragm; 51 - annular notch groove; 6 - self-suction diaphragm soft rubber sheet; 61 - edge sealing; 62 - bulging part; 63 - fitting cavity; 7 - fixed diaphragm screw; 71 - limiting end plate; 8 - fixed sheet; 81 - through hole; 9 - swing frame; 91 - swing head; 10 - front cover. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be further described in detail below in combination with embodiments and drawings. Herein, the illustrative embodiments of the present application and the description thereof are used to explain the present application, but not as a limitation of the present application.

[0026] Since the diaphragm pump forms negative pressure in the working process, it can well handle the gas in the suction liquid, thus having good self-suction capacity; and compared with other types of pumps, the diaphragm pump generally has lower energy consumption; the diaphragm pump can transport various media, including corrosive liquid, etc., thus having strong adaptability; the diaphragm pump has relatively simple structure, is easy to maintain and clean, and the parts are convenient to replace, thus having simple maintenance; since the liquid is isolated from the driving device during the working of the diaphragm pump, the diaphragm pump can prevent leakage and cross contamination, thus having high safety and reliability. In view of the above characteristics, the diaphragm pump is widely used in the transportation of chemical products.

[0027] The one-way valve diaphragm structure in the diaphragm pump will directly affect the working reliability of the diaphragm pump, and the traditional product adopts rubber skin diaphragm on the one-way valve diaphragm structure, which has limited corrosion resistance, needs to be replaced frequently, and the existing one-way valve diaphragm is prone to edge tearing (the concave surface faces the high pressure direction, and the medium flow will cause the edge to be squeezed and opened to cause tearing) or edge gap (flat surface lamination sealing, and the medium flow impact is prone to cause the edge to be raised) during working, causing the working cavity to be unable to be effectively sealed.

[0028] In order to solve the above technical problems, reference is made toFigures 1 to 6 As shown in Figure 1 and Figure 2 , the embodiment provides a self-suction diaphragm pump, comprising pump head 2, valve 4, self-suction diaphragm soft rubber sheet 6, fixed sheet 8, swing frame 9 and front cover 10 arranged coaxially in sequence, pump head 2, fixed sheet 8 and front cover 10 are fixedly connected to make valve 4 and self-suction diaphragm soft rubber sheet 6 be limited between pump head 2 and fixed sheet 8, swing frame 9 is limited between fixed sheet 8 and front cover 10, swing frame 9 is connected with eccentric swing motor installed on front cover 10 to make swing frame 9 swing up and down, and then make self-suction diaphragm soft rubber sheet 6 move back and forth, periodically change the volume of working cavity, fixed sheet 8 has through hole 81 through swing head 91 of swing frame 9, for pump head 2 connected with backflow valve cover 1, pump cavity of pump head 2 has ring cylinder 21 to form annular cavity and hollow cavity, hollow cavity is water outlet cavity and is connected with outlet pipe, annular cavity is water inlet cavity and is connected with water inlet pipe, valve 4 is provided with clamping groove 42 for inserting ring cylinder 21, valve 4 cooperates with ring cylinder 21 of pump head 2 to make water inlet cavity and water outlet cavity be isolated, one side of valve 4 facing self-suction diaphragm soft rubber sheet 6 has a plurality of independent valve cavities 47, self-suction diaphragm soft rubber sheet 6 cooperates with valve 4 to make valve cavity 47 form working cavity, self-suction diaphragm soft rubber sheet 6 is driven by swing frame 9, water inlet 46 in working cavity is communicated with water inlet cavity, and water outlet 45 in working cavity is communicated with water outlet cavity, one-way water inlet diaphragm 5 in working cavity is connected with valve 4 by connecting piece and located at water inlet 46, valve 4 is provided with one-way water outlet gasket 3 with a plurality of petals, one-way water outlet gasket 3 is located in water outlet cavity, corresponding petals of one-way water outlet gasket 3 form one-way valve at corresponding water outlet 45, wherein, water inlet 46 is composed of a plurality of water droplet-shaped small holes uniformly distributed along the annular path, which enhances the structural strength and facilitates the rapid passage of liquid; water outlet 45 is composed of a plurality of water outlet holes along the arc path, which is adapted to the layout and also enhances the structural strength and facilitates the rapid passage of liquid. One-way water outlet gasket 3 is connected with valve 4 by fixing piece, one-way water outlet gasket 3 with multiple petals is used, which has compact structure and can reduce the installation position, thereby reducing the leakage point.

[0029] In the present application, pump head 2 and front cover 10 are both made of polypropylene material, which improves the corrosion resistance of pump head 2 compared to polyamide material.

[0030] In the application, the one-way water inlet diaphragm 5 and the one-way water outlet gasket 3 are both made of tetrafluoroethylene material. Tetrafluoroethylene, commonly known as "plastic king", is a high molecular polymer made of tetrafluoroethylene as a monomer. Its chemical formula is (C2F4)n, and it has excellent heat and cold resistance and can be used for a long time at -180~260℃. This material has the characteristics of resisting acid, alkali and various organic solvents, and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance, and its friction coefficient is extremely low, so it can be used for lubrication. In terms of size, it is not easy to be too thick, and it can meet the design and use requirements by maintaining a certain elasticity, taking into account the sealing and protection functions, which is conducive to efficient and stable liquid absorption and discharge.

[0031] As shown in the drawings, Figure 3 In this embodiment, the one-way water outlet gasket 3 is in a circular shape, and the edge of the one-way water outlet gasket 3 is provided with a plurality of limiting clamping grooves 31 distributed in a radial shape to form a plurality of petal bodies. The valve 4 has a limiting clamping convex 44 matched with the limiting clamping groove 31. The limiting clamping convex 44 can prevent the one-way water outlet gasket 3 from rotating and affecting the working performance of the petal body. In the working process, by using the above structure, the petal body can independently move to control the opening and closing state of the corresponding water outlet 45, and does not affect the working state of other petal bodies.

[0032] In the application, the one-way water outlet gasket 3 and the one-way water inlet diaphragm 5 are connected to the center part by using round sheet fasteners to realize fixed installation.

[0033] As shown in the drawings, Figure 4 In the application, the end surface of the valve 4 matched with the one-way water outlet gasket 3 is in a concave shape; the one-way water inlet diaphragm 5 is in a conical shape, and the water inlet 46 is provided with a concave arc surface 48 matched with the one-way water inlet diaphragm 5. The one-way water outlet gasket 3 is matched with the concave end surface, and the one-way water inlet diaphragm 5 is matched with the concave arc surface 48. The liquid pressure in the concave cavity makes the one-way water outlet gasket and the end surface and the one-way water inlet diaphragm 5 and the concave arc surface 48 fit more reliably, so that the sealing performance is better. It can also avoid the liquid fluctuation to make the edge of the one-way water outlet gasket 3 and the one-way water inlet diaphragm 5 accidentally rise and affect the sealing reliability and use function. In addition, the convex surface is towards the low pressure direction, and the medium flow will extrude and gather the edge instead of expanding and deforming, so that the edge of the one-way water outlet gasket 3 and the one-way water inlet diaphragm 5 is not easy to tear.

[0034] As shown in the drawings, Figure 5 In the application, the side edge of the one-way water inlet diaphragm 5 away from the valve 4 is provided with a ring-shaped notch groove 51. The setting of the ring-shaped notch groove 51 can reduce the thickness of the edge of the one-way water inlet diaphragm 5, so that the edge of the one-way water inlet diaphragm 5 is easy to deform. When liquid is introduced, it can be quickly lifted, and when liquid is discharged, it can be extruded by high-pressure liquid to make the edge of the one-way water inlet diaphragm 5 fit the water inlet 46 more tightly, so that the sealing performance is high.

[0035] AsFigure 1 and Figure 6 As shown, the self-priming diaphragm soft film 6 has a plurality of bulges 62 corresponding one-to-one with the swing head 91 of the swing frame 9. The bulges 62 can pass through the corresponding through holes 81 of the fixed plate 8. The limiting end plate 71 of the diaphragm fixing screw 7 connected to the swing frame 9 is engaged with the matching cavity 63 located on the end surface of the corresponding bulge 62 to achieve the connection between the swing frame 9 and the self-priming diaphragm soft film 6. Compared with the fixing method of using screws to pass through the self-priming diaphragm soft film 6, the matching cavity 63 is not through, which can reduce leakage points and stabilize the function of the diaphragm pump.

[0036] The self-priming diaphragm soft film 6 has a sealing edge 61 that is in contact with the circumferential surface of the valve 4 , so that the self-priming diaphragm soft film 6 and the valve 4 have good sealing performance.

[0037] In the present application, the fixing plate 8 and the swing frame 9 are both made of aluminum.

[0038] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will appreciate that various modifications and variations of the present embodiment are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A self-priming diaphragm pump, comprising a pump head (2), a valve (4), a self-priming diaphragm soft rubber sheet (6), a fixed sheet (8), a swing frame (9) and a front cover (10) arranged coaxially in sequence, the pump head (2) having a water inlet cavity and a water outlet cavity, the valve (4) cooperating with the pump head (2) to isolate the water inlet cavity and the water outlet cavity, the valve (4) having a plurality of valve cavities (47), the self-priming diaphragm soft rubber sheet (6) cooperating with the valve (4) to form working cavities in the valve cavities (47), and the self-priming diaphragm soft rubber sheet (6) being driven by the swing frame (9), characterized in that, The working cavity is provided with a water inlet (46) communicated with the water inlet cavity and a water outlet (45) communicated with the water outlet cavity, the water inlet (46) is provided with a one-way water inlet diaphragm (5), the valve (4) is provided with a one-way water outlet gasket (3) with multiple petals, and the corresponding petals of the one-way water outlet gasket (3) form one-way valves at the corresponding water outlets (45).

2. The self-priming membrane pump of claim 1, wherein, The one-way water inlet diaphragm (5) and the one-way water outlet gasket (3) are both made of tetrafluoroethylene material.

3. The self-priming diaphragm pump of claim 1, wherein, The one-way water outlet gasket (3) is provided with multiple limiting clamping grooves (31) distributed in a radial manner at the edge to form multiple petals, and the valve (4) is provided with limiting clamping convexes (44) matched with the limiting clamping grooves (31).

4. The self-priming diaphragm pump of claim 1, wherein, The end surface of the valve (4) matched with the one-way water outlet gasket (3) is concave.

5. The self-priming diaphragm pump of claim 1, wherein, The one-way water inlet diaphragm (5) is in the shape of an umbrella, and the water inlet (46) is provided with a concave arc surface (48) matched with the one-way water inlet diaphragm (5).

6. The self-priming membrane pump of claim 5, wherein, The one-way water inlet diaphragm (5) is provided with an annular notch groove (51) on the side edge away from the valve (4).

7. The self-priming membrane pump of claim 1, wherein, The limiting end plate (71) of the fixed diaphragm screw (7) connected with the swing frame (9) is sleeved with the matched cavity (63) on the end surface of the self-suction diaphragm soft rubber sheet (6).

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