A diaphragm pump head and a diaphragm booster pump including the diaphragm pump head

Abstract

The present invention discloses a diaphragm pump head and a diaphragm booster pump including the diaphragm pump head, and relates to the field of water pumps. The scheme improves the structure of the diaphragm sheet and the piston push block, reduces the indentation formed by the piston push block on the diaphragm sheet, expands the range of the diaphragm sheet that can be extended, creates conditions for increasing the swing inclination angle of the cylindrical balance wheel, and greatly increases the pulling resistance of the diaphragm sheet, and has the advantages of long service life, reliability and stability. A diaphragm booster pump based on the improved diaphragm pump head is also proposed, which has a long service life and high reliability and stability.

Description

Technical Field

[0001] The present invention relates to the field of water pumps, and particularly to a diaphragm pump head and a diaphragm booster pump including the diaphragm pump head. Background Art

[0002] At present, diaphragm booster pumps are often used in reverse osmosis water filters at home and abroad. For example, Chinese Patent with application number 201410214003.5 discloses a shock absorption structure and a pendulum wheel structure of a five-booster chamber diaphragm pump, including a motor, a motor front cover, an inclined eccentric cam, a pendulum wheel seat, a pump head seat, a diaphragm, a piston push block, a piston valve body, and a pump head cover. A pendulum wheel is arranged on the pendulum wheel seat, an actuating perforation is arranged on the pump head seat, the pendulum wheel seat is arranged in the actuating perforation, and the piston push block and the diaphragm are fixed on the pendulum wheel through a fixing screw passing through the piston push block; a ring convex strip protrudes downward from the outer peripheral edge side of the bottom of the piston valve body, and the ring convex strip is inserted into the gap between the outer convex strip and the inner convex strip of the diaphragm. After the piston valve body is fastened, the diaphragm is compacted through the ring convex strip, the diaphragm is fixed, and a closed booster chamber is formed between the water inlet seat of the piston valve body and the top surface of the diaphragm.

[0003] The working process of this diaphragm booster pump is as follows: the motor drives the inclined eccentric cam to rotate, so that the inclined eccentric cam drives the pendulum wheel seat and the pendulum wheel thereon to perform an up-and-down swinging motion. The diaphragm elastically deforms with the swing of the pendulum wheel, so that the volume of the booster chamber between the diaphragm and the water inlet seat changes, thereby performing the process of water absorption - pressure boosting and drainage.

[0004] During the movement of the pendulum wheel, the diaphragm deforms as it moves back and forth frequently with the pendulum wheel. When the booster pump works normally, the deformability of the diaphragm material itself is relied on to buffer the reciprocating pulling of the pendulum wheel. Referring to Figures 118, 119, and 120 of this patent, the piston push block 80 is fastened to the cylindrical pendulum wheel 502 through a fixing screw 1. When the cylindrical pendulum wheel 502 swings up and down in the through hole of the pump head seat 60, it drives the diaphragm 70 to deform. The shear stress received by the diaphragm 70 gradually decreases along the connection position of the diaphragm 70, the piston push block 80, and the cylindrical pendulum wheel 502 towards the direction of the ring convex strip 91. The lower surface of the piston push block 80 contacts the upper surface of the diaphragm 70, and the lower surface of the diaphragm 70 contacts the cylindrical pendulum wheel 502. The contact surfaces of the three are all flat surfaces, and the diaphragm 70 is an elastic material. When fastening the piston push block 80, the locking force provided by the fixing screw 1 for the piston push block 80 will cause the diaphragm 70 to be pressed against the surface of the cylindrical pendulum wheel 502 and cause extrusion to the diaphragm 70. On the one hand, since the contact surface between the piston push block 80 and the diaphragm 70 is large, the deformable range of the diaphragm 70 becomes smaller, that is Figure 1The schematic L0. Since this distance is short, that is, the range in which the diaphragm can be extended and elastically deformed is small, which limits the magnitude of the inclination angle of the up-and-down swing of the cylindrical pendulum wheel 502, and further limits the number of cylindrical pendulum wheels provided, thus hindering the flow rate improvement of the booster pump. On the other hand, under the extrusion of the piston push block 80, the thickness of the diaphragm 70 becomes thinner, and an indentation 701 (refer to Figure 2 ) consistent with the shape of the lower surface of the piston push block 80 is formed on the diaphragm 70. The generation of this indentation will greatly increase the risk of the diaphragm 70 generating cracks and then leaking, which will reduce the service life of the diaphragm 70, thereby affecting the overall service life of the diaphragm pump.

[0005] Therefore, it is necessary to propose a diaphragm booster pump solution with good sealing performance and long service life. Summary of the Invention

[0006] To solve the above technical problems, the first object of the present invention is to provide a diaphragm pump head, which improves the structures of the diaphragm and the piston push block, reduces the formation of indentations on the diaphragm by the piston push block, expands the range in which the diaphragm can be stretched, creates conditions for increasing the swing inclination angle of the cylindrical pendulum wheel, and greatly increases the tensile resistance of the diaphragm, having the advantages of long service life, reliability, and stability.

[0007] To achieve the above invention object, the technical solution adopted by the present invention is as follows:

[0008] A diaphragm pump head includes a pump head seat, a pendulum wheel seat, a diaphragm, a piston push block, a piston valve seat, and a pump head cover. A plurality of cylindrical pendulum wheels are arranged on the pendulum wheel seat, and positioning grooves are arranged on the cylindrical pendulum wheels. The diaphragm includes a diaphragm body. On one side of the diaphragm body facing the cylindrical pendulum wheel, a positioning convex edge matching the positioning groove is arranged, and on the other side, a positioning convex column with a through hole is arranged. The piston push block is fixed to the cylindrical pendulum wheel of the pendulum wheel seat by a screw passing through the positioning convex column. An abutting groove is further arranged on the outer periphery of the diaphragm body where the positioning convex column is located. An abutting protrusion inserted into the abutting groove is arranged on one side of the piston push block facing the diaphragm, and the height of the abutting protrusion is greater than the depth of the abutting groove.

[0009] By setting it in this way, during installation, the diaphragm is positioned on the cylindrical pendulum wheel through the cooperation of the positioning convex edge and the positioning groove; then the piston push blocks are positioned one by one through the abutting protrusions and the abutting grooves, and then the screws pass through the piston push blocks, pass through the through holes of the positioning studs and are connected to the cylindrical pendulum wheel, fixing the piston push blocks and the diaphragm on the cylindrical pendulum wheel. When the screws fasten the piston push blocks, the diaphragm and the cylindrical pendulum wheel, the abutting protrusions are inserted into the abutting grooves, and the height of the abutting protrusions is greater than the height of the abutting grooves, squeezing the part of the diaphragm located in the positioning groove, so that the deformation range generated by the tightening force of the screws on the diaphragm is limited within the positioning groove. After the installation is completed, the surface of the piston push block that is parallel to the diaphragm under normal conditions maintains a distance from the diaphragm, thus avoiding the possibility of direct contact between the surface of the piston push block parallel to the diaphragm and the diaphragm, which may lead to indentation and then a decrease in the tensile resistance of the diaphragm. On the other hand, since the position where the diaphragm is deformed and pressed is located within the positioning groove, the extendable range of the part of the diaphragm located outside the positioning groove is enlarged, which is also beneficial to reducing the shear stress of the diaphragm, enhancing the tensile resistance of the diaphragm, prolonging the service life of the diaphragm pump head, and improving the reliability and stability. In addition, it increases the inclination angle allowed by the diaphragm for the cylindrical pendulum wheel to move, creating conditions for the subsequent design of the number of gears and the increase of the inclination angle, that is, creating conditions for increasing the flow rate of the pump.

[0010] Preferably, a threaded hole for connecting the screw is provided in the positioning groove on the cylindrical pendulum wheel. A positioning protrusion is provided on the outer periphery of the threaded hole on the cylindrical pendulum wheel. The height m of the positioning protrusion is less than the depth n of the positioning groove. A positioning concave portion for cooperating with the positioning protrusion is provided on the positioning convex edge.

[0011] By setting it in this way, since the position where the piston push block squeezes the diaphragm to deform is located in the positioning groove, a positioning concave portion is provided on the positioning convex edge, and a positioning protrusion is provided in the positioning groove, which can reduce the distance between the bottom of the positioning concave portion and the abutting groove, making the diaphragm more easily deformed and more easily filled in the positioning groove, increasing the waterproof effect.

[0012] Preferably, the wall thickness a0 of the diaphragm body, the distance a1 from the bottom of the abutting groove to the bottom of the positioning concave portion, the wall thickness a2 of the transition part between the diaphragm body and the positioning protrusion, and the wall thickness a4 of the positioning stud are equal.

[0013] By setting it in this way, the thickness of the diaphragm is made uniform, the manufacturing process difficulty is reduced, and it is beneficial to reduce the generation of defective products during the manufacturing process.

[0014] Preferably, an auxiliary protrusion is further provided on the outer periphery of the diaphragm body at the abutting groove. A receiving groove for receiving the auxiliary protrusion is provided on the piston push block.

[0015] By setting it in this way, the sealing performance after the piston push block, the diaphragm and the cylindrical pendulum wheel are fixedly connected is further enhanced, the possibility of water leakage is reduced, and the reliability of the diaphragm pump head is improved.

[0016] As an alternative solution, the present invention provides another diaphragm pump head, which includes a pump head seat, a pendulum wheel seat, a diaphragm, a piston push block, a piston valve seat and a pump head cover. A plurality of cylindrical pendulum wheels are arranged on the pendulum wheel seat. The diaphragm includes a diaphragm body. The piston push block has a positioning groove. On one side of the diaphragm body facing the piston push block, there is a positioning convex edge that cooperates with the positioning groove. On the other side, there is a pressing groove. A positioning convex column with a through hole is provided at the center of the pressing groove. A positioning concave hole for inserting the positioning convex column is provided on the cylindrical pendulum wheel. An abutting convex ridge inserted into the pressing groove is provided on the outer edge of the positioning concave hole. The height of the abutting convex ridge is greater than the depth of the pressing groove.

[0017] By setting it in this way, in this solution, the positioning groove is arranged on the piston push block, and the positioning convex edge is arranged on the diaphragm body. The diaphragm body is also provided with a positioning convex column and a pressing groove. A positioning concave hole for inserting the positioning convex column is arranged on the pendulum wheel seat, and an abutting convex ridge is arranged on the outer periphery of the positioning concave hole. During installation, the positioning convex column is inserted into the positioning concave hole, and the abutting convex ridge is inserted into the pressing groove to position the diaphragm and the cylindrical pendulum wheel. Then, the piston push block is sleeved outside the positioning convex column to make the positioning convex edge match the positioning groove. Then, a screw passes through the piston push block, through the through hole of the positioning convex column, and is threadedly connected and fixed to the cylindrical pendulum wheel. During the process of thread tightening, the abutting convex ridge on the pendulum wheel seat is inserted into the pressing groove to squeeze the diaphragm. Since the height of the abutting convex ridge is greater than the depth of the pressing groove, after tightening, there is also a spacing between the surface of the piston push block parallel to the diaphragm and the diaphragm. The position where the diaphragm is deformed by extrusion is also within the positioning groove, thus avoiding the direct contact between the surface of the piston push block parallel to the diaphragm and the diaphragm and forming indentations on the diaphragm, and further avoiding the possibility of reducing the tensile resistance of the diaphragm, improving the tensile resistance of the diaphragm, prolonging the service life of the diaphragm pump head, and improving its reliability and stability during use. On the other hand, consistent with the first solution, since the range of the diaphragm being deformed by extrusion is limited to the positioning groove, the extendable and deformable range outside the diaphragm is increased, which is beneficial to reducing the shear stress of the diaphragm, enhancing the tensile resistance of the diaphragm, increasing the allowable inclination angle of the cylindrical pendulum wheel for the diaphragm to move, creating conditions for the subsequent design of the number of gears and the increase of the inclination angle, that is, creating conditions for increasing the flow rate of the pump.

[0018] Preferably, a positioning protrusion is arranged in the positioning groove. The height m of the positioning protrusion is less than the depth n of the positioning groove. A positioning concave portion that cooperates with the positioning protrusion is arranged on the positioning protrusion.

[0019] By setting it in this way, the distance between the bottom of the positioning recess and the pressing groove can be reduced, making the diaphragm easier to deform and easier to fill the positioning groove, thereby increasing the waterproof effect.

[0020] Preferably, the wall thickness a0 of the diaphragm body, the distance a1 from the bottom of the pressing groove to the bottom of the positioning recess, the wall thickness a2 of the transition part between the diaphragm body and the positioning protrusion, and the wall thickness a4 of the positioning stud are equal.

[0021] By setting it in this way, the thickness of the diaphragm is made uniform, the manufacturing process difficulty is reduced, and it is beneficial to reduce the generation of defective products during the manufacturing process.

[0022] Based on the same inventive concept, the second object of the present invention is to provide a diaphragm booster pump, which includes a motor and also includes any one of the above diaphragm pump heads, and the motor is connected to the diaphragm pump head.

[0023] By setting it in this way, since the above diaphragm pump head is adopted, it naturally also has the above technical effects, that is, the service life of the diaphragm booster pump can be extended, the reliability and stability can be increased, and it is also beneficial to increase the flow rate of the diaphragm booster pump, having a good application prospect.

[0024] Compared with the prior art, the present invention has obtained beneficial technical effects:

[0025] 1. A diaphragm pump head is proposed. By improving the structures of the diaphragm, the piston push block and the cylindrical pendulum wheel, indentation on the diaphragm is avoided, the area of the diaphragm under pressure is reduced, the extendable range of the diaphragm is increased, providing a design reference for a diaphragm booster pump with a large flow rate, effectively improving the service life of the diaphragm pump head, and enhancing its reliability and stability in use.

[0026] 2. A diaphragm booster pump based on the improved diaphragm pump head is proposed, which has a long service life, high reliability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the connection among the piston push block, the diaphragm and the cylindrical pendulum wheel in the prior art;

[0028] Figure 2 is a schematic structural diagram of the diaphragm after being used for a period of time in the prior art;

[0029] Figure 3 is an exploded schematic diagram of the overall structure of the diaphragm pump head in Embodiment 1 of the present invention;

[0030] Figure 4 is a cross-sectional view of the diaphragm pump head in Embodiment 1 of the present invention;

[0031] Figure 5 is Figure 7 an enlarged view of part O in ;

[0032] Figure 6 is a schematic structural view of the diaphragm in Embodiment 1 of the present invention;

[0033] Figure 7 is a cross-sectional view of the diaphragm pump head in Embodiment 2 of the present invention;

[0034] Figure 8 is Figure 7 an enlarged view of part P in ;

[0035] Figure 9 is a schematic structural view of the diaphragm in Embodiment 2 of the present invention;

[0036] Figure 10 is a cross-sectional view of the diaphragm pump head in Embodiment 3 of the present invention;

[0037] Figure 11 is Figure 10 an enlarged view of part Q in ;

[0038] Figure 12 is a cross-sectional view of the diaphragm pump head in Embodiment 4 of the present invention;

[0039] Figure 13 is Figure 12 an enlarged view of part R in ;

[0040] Figure 14 is a schematic structural view of the diaphragm in Embodiment 4 of the present invention;

[0041] Figure 15 is an exploded schematic view of the overall structure of the membrane booster pump in Embodiment 5 of the present invention.

[0042] Among them, the technical features represented by each reference numeral are as follows:

[0043] 1, screw; 502, cylindrical pendulum wheel; 5021, threaded hole; 60, pump head seat; 70, diaphragm; 701, indentation; 702, diaphragm body; 703, rib; 704, positioning stud; 705, auxiliary protrusion; 80, piston push block; 801, receiving groove; 901, annular rib; 11, diaphragm pump head; 110, pendulum wheel seat; 111, piston valve seat; 112, pump head cover; 2, positioning groove; 201, positioning protrusion; 3, positioning flange; 301, positioning recess; 4, pressing groove; 5, pressing protrusion; 6, positioning concave hole; 7, motor; 700, front cover. Detailed implementation manners

[0044] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments. However, the scope of protection required by the present invention is not limited to the specific embodiments described below.

[0045] Embodiment 1

[0046] Reference Figures 3 - 6 , this embodiment discloses a diaphragm pump head 11, which includes a pump head seat 60, a pendulum wheel seat 110, a diaphragm 70, a piston push block 80, a piston valve seat 111 and a pump head cover 112. It also includes structures such as an eccentric cam and a bearing that are not shown in the figure. The parts not shown are prior art.

[0047] Reference Figures 3 - 6 , in this embodiment, a plurality of cylindrical pendulum wheels 502 are provided on the pendulum wheel seat 110. A positioning groove 2 is provided on the cylindrical pendulum wheel 502. The diaphragm 70 includes a diaphragm body 702. A positioning convex edge 3 that cooperates with the positioning groove 2 is provided on one side of the diaphragm body 702 facing the cylindrical pendulum wheel 502, and a positioning convex column 704 with a through hole (not marked in the figure) is provided on the other side. The piston push block 80 is fixed to the cylindrical pendulum wheel 502 of the pendulum wheel seat 110 through a screw 1 passing through the positioning convex column 704. A pressing groove 4 is further provided on the diaphragm body 702 around the periphery of the positioning convex column 704. A pressing protrusion 5 inserted into the pressing groove 4 is provided on one side of the piston push block 80 facing the diaphragm 70. The height of the pressing protrusion 5 is greater than the depth of the pressing groove 4, that is, H>h.

[0048] Reference Figure 2 , Figure 3 , Figure 4 and Figure 6 , the structure of the diaphragm body 702 in this embodiment is the same as that of the diaphragm 70 in the prior art, and is divided into a plurality of water injection areas (not marked in the figure) by a plurality of rib structures 703 according to the number of piston push blocks 80.

[0049] Reference Figure 4 and Figure 5, the fastening force generated by the screw 1 is transmitted to the diaphragm 70 through the piston push block 80, so that the deformation range of the diaphragm 70 is limited within the positioning groove 2. Thus, the surface of the piston push block 80 that is parallel to the diaphragm 70 maintains a distance from the diaphragm 70 under normal conditions, thereby avoiding direct contact between the surface of the piston push block 80 that is parallel to the diaphragm 70 and the diaphragm 70 and generating indentations 701, which may lead to a decrease in the tensile resistance of the diaphragm 70. On the other hand, since the position where the diaphragm 70 is deformed and pressed is within the positioning groove 2, the extendable range of the part of the diaphragm 70 outside the positioning groove 2 is enlarged. That is, the distance L1 from the positioning groove 2 to the annular rib 901 in the drawing is greater than L0 in the conventional structure, which is also beneficial to reducing the shear stress of the diaphragm 70, enhancing the tensile resistance of the diaphragm 70, extending the service life of the diaphragm pump head 11, and improving reliability and stability. In addition, the inclination angle that allows the cylindrical pendulum wheel 502 to move is increased for the diaphragm 70, creating conditions for subsequent design of the number of gears and the increase of the inclination angle, that is, creating conditions for increasing the flow rate of the pump later.

[0050] Preferably, after the piston push block 80 and the diaphragm 70 are fixed on the cylindrical pendulum wheel 502, the distance between the surface of the piston push block 80 that is parallel to the diaphragm 70 ( Figure 5 the surface P shown in the figure) and the upper surface of the spacer is 0.01 - 0.5 mm.

[0051] Embodiment 2

[0052] Reference Figures 7 - 9 , based on Embodiment 1, this embodiment discloses another diaphragm pump head 11. The difference between this embodiment and Embodiment 1 is as follows:

[0053] A threaded hole 5021 for connecting the screw 1 is provided in the positioning groove 2 on the cylindrical pendulum wheel 502. A positioning protrusion 201 is provided on the outer periphery of the threaded hole 5021 on the cylindrical pendulum wheel 502. The height m of the positioning protrusion 201 is less than the depth n of the positioning groove 2. A positioning recess 301 that cooperates with the positioning protrusion 201 is provided on the positioning rib 3.

[0054] Preferably, m = (1 / 4)n.

[0055] The diaphragm 70 is a thermoplastic vulcanized rubber diaphragm. The positioning rib 3, the positioning stud 704, the pressing groove 4, and the positioning recess 301 on the diaphragm 70 are integrally formed with the diaphragm body 702.

[0056] Reference Figure 9 , the wall thickness a0 of the diaphragm body 702, the distance a1 from the bottom of the pressing groove 4 to the bottom of the positioning recess 301, the wall thickness a2 of the transition part between the diaphragm body 702 and the positioning protrusion 201, and the wall thickness a4 of the positioning stud 704 are equal.

[0057] Example 3

[0058] Reference Figure 10 and Figure 11 , this embodiment discloses another diaphragm pump head 11. This embodiment is based on Embodiment 1 or Embodiment 2, and the differences from Embodiment 1 or Embodiment 2 are as follows:

[0059] An auxiliary protrusion 705 is further provided on the diaphragm body 702 on the outer periphery of the pressing groove 4, and a receiving groove 801 for receiving the auxiliary protrusion 705 is provided on the piston push block 80.

[0060] The deformation of the diaphragm 70 not only occurs in the positioning groove 2, but also occurs in the receiving groove 801. The receiving groove 801 is provided opposite to the positioning groove 2, so that the deformation range of the diaphragm 70 under extrusion is also located in the positioning groove 2, and the range of the extendable elastic deformation of the diaphragm 70, as Figure 10 indicated by L2 in, L2 can also be greater than L0 of the existing structure, which plays a role in enhancing the tensile resistance of the diaphragm 70, extending the service life of the diaphragm pump head 11, and improving reliability and stability.

[0061] Example 4

[0062] Reference Figures 12 - 14 , as an alternative, this embodiment discloses another diaphragm pump head 11, including a pump head seat 60, a pendulum wheel seat 110, a diaphragm 70, a piston push block 80, a piston valve seat 111 and a pump head cover 112. A plurality of cylindrical pendulum wheels 502 are provided on the pendulum wheel seat 110. The diaphragm 70 includes a diaphragm body 702. There is a positioning groove 2 on the piston push block 80. A positioning convex edge 3 cooperating with the positioning groove 2 is provided on one side of the diaphragm body 702 facing the piston push block 80, and a pressing groove 4 is provided on the other side. A positioning convex column 704 with a through hole is provided at the center of the pressing groove 4. A positioning concave hole 6 for inserting the positioning convex column 704 is provided on the cylindrical pendulum wheel 502, and a pressing protrusion 5 inserted into the pressing groove 4 is provided on the outer edge of the positioning concave hole 6. The height J of the pressing protrusion 5 is greater than the depth j of the pressing groove 4.

[0063] More preferably, the height I of the positioning convex edge 3 is greater than the depth i of the positioning groove 2.

[0064] Reference Figure 12 and Figure 13, the extendable range of the part of the diaphragm 70 located outside the positioning groove 2 is enlarged, that is, the distance L3 from the positioning groove 2 to the annular convex strip 901 in the drawing is also greater than L0 in the conventional structure, achieving the same technical effect as in Embodiment 1, that is, it is beneficial to reduce the shear stress of the diaphragm 70, enhance the tensile resistance of the diaphragm 70, extend the service life of the diaphragm pump head 11, and improve the reliability and stability. In addition, the inclination angle of the diaphragm 70 allowing the cylindrical pendulum wheel 502 to move is increased, creating conditions for the subsequent design of the number of gears and the increase of the moving inclination angle, that is, creating conditions for increasing the flow rate of the pump subsequently.

[0065] Preferably, after the piston push block 80 and the diaphragm 70 are fixed on the cylindrical pendulum wheel 502, the distance between the surface of the piston push block 80 parallel to the diaphragm 70 ( Figure 13 the plane P shown in) and the upper surface of the spacer is 0.01 - 0.5 mm.

[0066] A positioning protrusion 201 is provided in the positioning groove 2. The height m of the positioning protrusion 201 is less than the depth n of the positioning groove 2. A positioning recess 301 cooperating with the positioning protrusion 201 is provided on the positioning protrusion 201.

[0067] Preferably, m = (1 / 4)n.

[0068] Reference Figure 14 , the wall thickness a0 of the diaphragm body 702, the distance a1 from the bottom of the pressing groove 4 to the bottom of the positioning recess 301, the wall thickness a2 of the transition part between the diaphragm body 702 and the positioning protrusion 201, and the wall thickness a4 of the positioning convex column 704 are equal.

[0069] Embodiment 5

[0070] Reference Figure 15 , this embodiment discloses a diaphragm booster pump, including a motor 7, and also including any one of the diaphragm pump heads 11 in Embodiments 1 - 3. The main shaft of the motor 7 is connected to the eccentric cam of the diaphragm pump head 11. The front cover 700 of the motor 7 is fixed to the pump head seat 60 of the diaphragm pump head 11. The motor 7 provides rotational power for the diaphragm pump head 11, driving the eccentric cam to swing, and then driving the pendulum wheel seat 110 to act in the pump head seat 60, and then driving the diaphragm 70 to deform, so that the internal cavity of the diaphragm pump head 11 changes, and the processes of water absorption and pressurized drainage are the same as those in the prior art and will not be elaborated here. By using the diaphragm pump head 11 of the above embodiment, the service life of this diaphragm booster pump is long, the reliability and stability are high, a larger flow rate can be set, and it has good market application prospects.

[0071] Based on the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the invention.

Claims

1. A diaphragm pump head, comprising a pump head seat (60), a balance wheel seat (110), a diaphragm (70), a piston push block (80), a piston valve seat (111) and a pump head cover (112), wherein a plurality of cylindrical balance wheels (502) are arranged on the balance wheel seat (110), and a positioning groove (2) is arranged on the cylindrical balance wheel (502), and the diaphragm (70) comprises a diaphragm body (702), and a positioning convex edge (3) cooperating with the positioning groove (2) is arranged on one side of the diaphragm body (702) facing the cylindrical balance wheel (502), and a positioning convex column (704) with a through hole is arranged on the other side, and the piston push block (80) is fixed to the cylindrical balance wheel (502) of the balance wheel seat (110) by a screw (1) passing through the positioning convex column (704), characterized in that: The diaphragm body (702) is also provided with a pressing groove (4) located on the outer periphery of the positioning boss (704), and the piston push block (80) is provided with a pressing protrusion (5) inserted into the pressing groove (4) on the side facing the diaphragm (70), and the height of the pressing protrusion (5) is greater than the depth of the pressing groove (4).

2. The diaphragm pump head according to claim 1, characterized in that: The cylindrical balance wheel (502) is provided with a threaded hole (5021) for connecting the screw (1) in the positioning groove (2), and the cylindrical balance wheel (502) is provided with a positioning protrusion (201) on the outer periphery of the threaded hole (5021), the height of the positioning protrusion (201) m is less than the depth n of the positioning groove (2), and the positioning convex edge (3) is provided with a positioning recess (301) that cooperates with the positioning protrusion (201).

3. The diaphragm pump head according to claim 2, characterized in that: The wall thickness a0 of the diaphragm body (702), the distance a1 from the bottom of the pressing groove (4) to the bottom of the positioning recess (301), the wall thickness a2 of the transition portion between the diaphragm body (702) and the positioning protrusion (201), and the wall thickness a4 of the positioning protrusion (704) are equal.

4. The diaphragm pump head according to claim 1 or 2, characterized in that: An auxiliary protrusion (705) is also provided on the diaphragm body (702) at the periphery of the pressing groove (4), and an accommodating groove (801) for accommodating the auxiliary protrusion (705) is provided on the piston push block (80).

5. A diaphragm pump head, comprising a pump head seat (60), a balance wheel seat (110), a diaphragm (70), a piston push block (80), a piston valve seat (111) and a pump head cover (112), wherein a plurality of cylindrical balance wheels (502) are arranged on the balance wheel seat (110), and the diaphragm (70) comprises a diaphragm body (702), characterized in that: The piston push block (80) is provided with a positioning groove (2), and the diaphragm body (702) is provided with a positioning convex edge (3) cooperating with the positioning groove (2) on one side facing the piston push block (80), and a pressing groove (4) is provided on the other side, and a positioning protrusion (704) with a through hole is provided at the center of the pressing groove (4), and a positioning recessed hole (6) for the positioning protrusion (704) to be inserted into the cylindrical balance wheel (502) is provided, and a pressing protrusion (5) inserted into the pressing groove (4) is provided on the outer edge of the positioning recessed hole (6), and the height of the pressing protrusion (5) is greater than the depth of the pressing groove (4), and the height of the positioning protrusion (3) is greater than the depth of the positioning groove (2).

6. The diaphragm pump head according to claim 5, characterized in that: A positioning protrusion (201) is arranged in the positioning groove (2), the height m of the positioning protrusion (201) is smaller than the depth n of the positioning groove (2), and a positioning recess (301) cooperating with the positioning protrusion (201) is arranged on the positioning protrusion (201).

7. The diaphragm pump head according to claim 6, characterized in that: The wall thickness a0 of the diaphragm body (702), the distance a1 from the bottom of the pressing groove (4) to the bottom of the positioning recess (301), the wall thickness a2 of the transition portion between the diaphragm body (702) and the positioning protrusion (201), and the wall thickness a4 of the positioning protrusion (704) are equal.

8. A diaphragm booster pump, comprising a motor (7), characterized in that: It also comprises a diaphragm pump head according to any one of claims 1-4 or 5-7, wherein the motor (7) is connected to the diaphragm pump head.

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