Diaphragm mounting structure of metering pump

Abstract

The utility model discloses a diaphragm installation structure of a metering pump, which comprises a one-way conveying cylinder, a pressure cylinder and a plunger assembly, a diaphragm assembly with a diaphragm is arranged between the pressure cylinder and the one-way conveying cylinder, and an embedded convex ring and an arc ring groove are arranged on a sealing end face, which is relatively fixed with the one-way conveying cylinder, of the pressure cylinder. The top of the embedded convex ring and the bottom of the arc ring groove are arranged in an arc shape, and sealing clamping parts used for clamping the diaphragm are arranged on the outer sides of the embedded convex ring and the arc ring groove. According to the diaphragm installation structure of the metering pump, the multiple embedded convex rings, the arc ring grooves and the sealing clamping parts are arranged to be matched to form the sealing end face, the gaps which are gradually reduced from inside to outside are combined, and the embedded convex rings and the arc ring grooves close to the middle do not conduct rigid clamping on the diaphragm; the embedded convex ring and the arc ring groove can buffer the diaphragm through folding, so that the diaphragm which is expanded and tightened in a reciprocating mode obtains tensile force to be attached to the surfaces of the embedded convex ring and the arc ring groove for unloading, rigid clamping damage of the diaphragm and the edge of the sealing end face is reduced, and the service life of the diaphragm assembly is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of metering pump, concretely relates to a diaphragm mounting structure of metering pump. BACKGROUND

[0002] Metering pump is also called proportional pump, when the liquid quantity is changed, the eccentric distance of the adjusting eccentric wheel is used to change the stroke of the plug to realize the change conveniently and accurately. The traditional metering pump is generally composed of a motor, a transmission box and a cylinder body. In order to prevent the medium from leaking for the diaphragm metering pump, a diaphragm is arranged to completely seal the medium.

[0003] The structure of the diaphragm metering pump in the prior art can ensure sealing in a static state, but the diaphragm sheet is subjected to the reciprocating action of the plunger power continuously in the use process. In the continuous action, the edge of the ring clamping the diaphragm sheet and the edge of the liquid inlet and outlet hole are the points that are easy to cause the diaphragm sheet to be damaged. Especially when the pressure of the diaphragm metering pump is very high, the force of the cylinder cover is also very large, that is, the force of the diaphragm is also very large, which exceeds the allowable strength of the diaphragm, and the diaphragm is damaged; the service life of the diaphragm in the prior art is not long. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of plunger metering pumps, and multiple embedded convex rings and arc ring grooves are arranged on the sealing end face, to form flexible sealing clamping, reduce the damage of sealing clamping to diaphragm sheet.

[0005] The utility model discloses a kind of plunger metering pumps, and multiple embedded convex rings and arc ring grooves are arranged on the sealing end face, to form flexible sealing clamping, reduce the damage of sealing clamping to diaphragm sheet.

[0006] As a further setting of the above scheme, the embedded convex ring and the arc ring groove are at least provided with three groups from inside to outside, and a gap is left between the embedded convex ring and the arc ring groove for clamping diaphragm sheet.

[0007] As a further setting of the above scheme, the gap width between the embedded convex ring and the arc ring groove is greater than the diaphragm sheet size of diaphragm assembly, and the size is sequentially reduced from inside to outside.

[0008] As a further setting of the above scheme, the one-way conveying cylinder includes liquid inlet side and liquid outlet side, and the liquid inlet side and the liquid outlet side are each provided with one-way flow component.

[0009] As a further setting of the above scheme, the one-way flow component includes plug, spring piece and several groups of buffer components, and the buffer component includes eccentric flow channel block and plug bead.

[0010] As a further arrangement of the above-mentioned scheme, the plunger assembly comprises a plunger rod connected with the power element, a front end of the plunger rod is connected with a piston head, and the pressure cylinder is internally provided with a pressure cavity matched with the piston head.

[0011] Beneficial effects: the diaphragm mounting structure of the metering pump, through the sealing end face formed by the cooperation of the multiple embedded convex rings, the arc ring grooves and the sealing clamping parts, the sealing end face is formed based on the above structure, and a gap gradually reducing from inside to outside is left, the embedded convex ring and the arc ring groove near the middle part do not rigidly clamp the diaphragm, the gap gradually reducing outwardly further clamps and seals the diaphragm stably, and the embedded convex ring and the arc ring groove can further buffer the diaphragm through the fold reflection, so that the reciprocating expansion and tension of the diaphragm are stretched to be attached to the surface of the embedded convex ring and the arc ring groove to unload force, and rigid clamping damage of the diaphragm and the edge of the sealing end face is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the metering pump.

[0013] Figure 2 It is an installation structure schematic diagram of the pump body and the diaphragm assembly.

[0014] Figure 3 It is a sealing end face structure schematic diagram of the embodiment.

[0015] Figure 4 It is a one-way flow component structure schematic diagram of the embodiment.

[0016] The figure mark: 1, one-way conveying cylinder; 11, liquid inlet side; 12, liquid outlet side; 13, one-way flow component; 131, blocking piece; 132, spring piece; 14, buffer component; 141, eccentric flow channel block; 142, blocking bead; 2, pressure cylinder; 21, pressure cavity; 3, plunger assembly; 31, plunger rod; 32, piston head; 4, diaphragm assembly; 41, diaphragm; 5, sealing end face; 51, embedded convex ring; 52, arc ring groove; 53, gap; 54, sealing clamping part. DETAILED DESCRIPTION

[0017] In order to enable the above-mentioned purpose, features and advantages of the utility model to be more clearly understood, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0018] As Figures 1-4The diaphragm mounting structure of a metering pump is shown, which comprises a one-way delivery cylinder 1, a pressure cylinder 2, and a plunger assembly 3. The pressure cylinder 2 is provided with a diaphragm assembly 4 with a diaphragm 41 between the one-way delivery cylinder 1. The sealing end face 5 of the pressure cylinder 2 and the one-way delivery cylinder 1 is fixedly provided with an embedded convex ring 51 and an arc ring groove 52. The top of the embedded convex ring 51 and the bottom of the arc ring groove 52 are both provided in a circular arc. The outer side of the embedded convex ring 51 and the arc ring groove 52 is provided with a sealing clamping part 54 for clamping the diaphragm 41.

[0019] As a further arrangement of the above scheme, the embedded convex ring 51 and the arc ring groove 52 are provided with at least three groups from inside to outside, and a gap 53 is left between the embedded convex ring 51 and the arc ring groove 52 for clamping the diaphragm 41.

[0020] As a further arrangement of the above scheme, the gap 53 between the embedded convex ring 51 and the arc ring groove 52 is larger than the size of the diaphragm 41 of the diaphragm assembly 4, and the size is sequentially reduced from inside to outside.

[0021] As a further arrangement of the above scheme, the one-way delivery cylinder 1 comprises a liquid inlet side 11 and a liquid outlet side 12, and the liquid inlet side 11 and the liquid outlet side 12 are both provided with a one-way flow assembly 13.

[0022] As a further arrangement of the above scheme, the one-way flow assembly 13 comprises a plug 131, a spring 132, and a plurality of buffer assemblies 14, and the buffer assembly 14 comprises an eccentric flow channel block 141 and a plug bead 142.

[0023] As a further arrangement of the above scheme, the plunger assembly 3 comprises a column 31 connected with a power member, and the front end of the column 31 is connected with a piston head 32. The pressure cylinder 2 is provided with a pressure cavity 21 matched with the piston head 32.

[0024] Reference Figure 1 The plunger metering pump structure of the present embodiment comprises a one-way delivery cylinder 1, a pressure cylinder 2, and a plunger assembly 3. The diaphragm assembly 4 is arranged between the pressure cylinder 2 and the one-way delivery cylinder 1. Further, reference is made to Figure 2 and Figure 3The opposite sealing end surfaces 5 of the pressure cylinder 2 and the one-way conveying cylinder 1 are provided with the structure of the embedded convex ring 51 and the arc ring groove 52, the embedded convex ring 51 and the arc ring groove 52 on the pressure cylinder 2 and the embedded convex ring 51 and the arc ring groove 52 on the one-way conveying cylinder 1 are embedded with each other, and a gap 53 is left between the embedded convex ring 51 and the arc ring groove 52 after they are matched and fixed, the gap 53 is used for clamping the diaphragm 41, and it is worth noting that at least three groups are provided from inside to outside in the embodiment, and the gap 53 is gradually reduced from inside to outside, the thickness of the outermost gap 53 is smaller than the thickness of the diaphragm 41, and a sealing clamping part 54 is arranged at the outermost side for clamping and fixing the diaphragm 41, in the use process, when the diaphragm 41 is stretched and elastically expanded under the medium pressure, the stretching and movement of the diaphragm 41 is buffered in the at least three return bends of the embedded convex ring 51 and the arc ring groove 52 with the arc, the gap 53 of the embedded convex ring 51 and the arc ring groove 52 is greater than the thickness of the diaphragm 41, the stretching and movement in the middle part is buffered, and excessive wear of the diaphragm 41 and the edges of the pressure cylinder 2 and the one-way conveying cylinder 1 is avoided, and clamping at the edge end of the diaphragm 41 ensures the fixing;

[0025] As described above, in the working process of the diaphragm 41 in the embodiment, when the diaphragm 41 is expanded under the medium pressure, the diaphragm 41 will have a certain expansion, the edge of the diaphragm 41 in the prior art is clamped by the pressure cylinder 2 and the one-way conveying cylinder 1 when it is expanded, and in the scheme of the embodiment, the gap 53 is arranged, and then the embedded convex ring 51 and the arc ring groove 52 with the arc structure are arranged, based on the fact that the gap 53 is greater than the diaphragm 41, the diaphragm 41 will not be clamped tightly when it is stretched, and the diaphragm 41 will not be rigidly clamped with the pressure cylinder 2 and the one-way conveying cylinder 1 in the reciprocating expansion process, after the buffering of the multiple embedded convex rings 51 and arc ring grooves 52, the reciprocating stretching force is transferred, the clamping of the edge basically has no effect on the diaphragm 41, and the service life of the diaphragm 41 is improved.

[0026] In addition, the one-way flow assembly 13 in the embodiment includes a blocking piece 131, a spring piece 132 and a plurality of groups of buffer assemblies 14, the buffer assembly 14 includes an eccentric flow channel block 141 and a blocking bead 142, in the use process, the medium is subjected to pressure and flows from the bottom to the top from one side Figure 4 , the medium pushes away the blocking bead 142 to make the flow channel of the eccentric flow channel block 141 deviate, pushes away the next blocking bead 142 to pass through a plurality of buffer assemblies 14, and then enters the medium cavity in the one-way conveying cylinder 1 after pushing away the blocking piece 131.

[0027] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model belong to the scope of the utility model scheme and equivalent technologies, the utility model also intends to include these modifications and variations.

Claims

1. A diaphragm mounting structure for a metering pump, comprising a unidirectional delivery cylinder (1), a pressure cylinder (2), and a plunger assembly (3), characterized in that: A diaphragm assembly (4) with a diaphragm (41) is provided between the pressure cylinder (2) and the one-way conveying cylinder (1). The sealing end face (5) of the pressure cylinder (2) and the one-way conveying cylinder (1) is provided with a convex ring (51) and an arc ring groove (52). The top of the convex ring (51) and the bottom of the arc ring groove (52) are both arc-shaped. A sealing clamping part (54) for clamping the diaphragm (41) is provided on the outside of the convex ring (51) and the arc ring groove (52).

2. The diaphragm mounting structure of a metering pump according to claim 1, characterized in that: The embedded protruding ring (51) and the arc ring groove (52) are provided in at least three sets from the inside to the outside, and a gap (53) is left between the embedded protruding ring (51) and the arc ring groove (52) for the membrane (41) to be clamped.

3. The diaphragm mounting structure of a metering pump according to claim 2, characterized in that: The gap (53) between the convex ring (51) and the arc ring groove (52) is wider than the size of the membrane (41) of the diaphragm assembly (4), and the size decreases from the inside to the outside.

4. The diaphragm mounting structure of a metering pump according to claim 1, characterized in that: The unidirectional conveying cylinder (1) includes an inlet side (11) and an outlet side (12), and both the inlet side (11) and the outlet side (12) are provided with unidirectional flow components (13).

5. The diaphragm mounting structure of a metering pump according to claim 4, characterized in that: The unidirectional flow component (13) includes a plug (131), a spring (132), and several sets of buffer components (14), wherein the buffer components (14) include an eccentric flow channel block (141) and a plug bead (142).

6. The diaphragm mounting structure of a metering pump according to claim 1, characterized in that: The plunger assembly (3) includes a rod (31) connected to a power component, and a piston head (32) is connected to the front end of the rod (31). The pressure cylinder (2) is provided with a pressure chamber (21) that matches the piston head (32).

Images