Diaphragm type plunger metering pump

Abstract

The utility model discloses a diaphragm type plunger metering pump which comprises a pressure cylinder and a pump body, a liquid cavity is arranged in the pressure cylinder, a medium cavity is arranged in the pump body, a diaphragm assembly is arranged between the liquid cavity and the medium cavity, the liquid cavity is further provided with a plunger assembly, and the plunger assembly is arranged in the pump body. The plunger assembly comprises a plunger barrel fixed to the pressure cylinder in a sealed mode and a column rod located at the rear end in the plunger barrel and connected with the power piece, sealing filler is further arranged between the column rod and the plunger barrel, the pressure cylinder is provided with a flow channel, and the flow channel is communicated with a radial hole formed in the sealing filler. According to the plunger metering pump, the large column head, the small column head and the flow channel are arranged, the column rod can be lubricated through oil liquid in the liquid guiding cavity, on one hand, abrasion of a reciprocating part can be reduced, on the other hand, the oil liquid is wrapped on the column rod and packing and continuously and circularly flows on the basis of reciprocating motion of the oil liquid, the packing and the column rod are cooled, and the service life of the packing and the column rod is prolonged. Therefore, the use durability of the plunger assembly in the pump is improved, and the service life of the plunger pump is prolonged.

Description

TECHNICAL FIELD

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

[0002] The plunger type metering pump is in operation, relies on the reciprocating movement of the internal plunger, and cooperates with the one-way valve at the cavity feed inlet and discharge outlet, thereby continuously sucking and extruding the material to realize the pushing of the material, and the plunger rod is in the reciprocating movement in the pressure cavity in the process, and the wear is large, and the existing technology generally realizes by improving the wear resistance of the plunger rod and the sealing element, however, the improvement in the material direction has been stable, and it is difficult to obtain great improvement before the material has a great breakthrough. SUMMARY

[0003] The utility model discloses a kind of plunger pump structures, which is improved in structure, so that oil liquid in drainage liquid cavity lubricates between plunger rod and sealing element, thereby reducing the reciprocating friction and wear of existing plunger.

[0004] The utility model discloses a diaphragm type plunger metering pump, including pressure cylinder and pump body, be equipped with liquid cavity in the pressure cylinder, be equipped with medium cavity in the pump body, be equipped with diaphragm subassembly between liquid cavity and medium cavity, liquid cavity is also equipped with plunger subassembly, the plunger subassembly includes with the pressure cylinder fixedly connected plug barrel, the column rod of rear end connection power component in plug barrel, plunger rod and plug barrel between still be equipped with sealing packing, be equipped with flow channel on the pressure cylinder, the radial hole of flow channel and sealing packing is set up intercommunication.

[0005] As a further setting of the above scheme, the column rod includes a large head and a rod part, the sealing packing includes a fixed compression ring with a radial hole and an elastic packing ring, the elastic packing ring is provided with a large packing ring and a small packing ring respectively matched with the diameters of the large head and the rod part.

[0006] As a further setting of the above scheme, the opening diameter of the plug barrel front end for the large head to extend out is greater than the large head, the flow channel includes an inlet and an outlet opposite to the fixed compression ring between the large packing ring and the small packing ring, and the flow channel is further provided with a one-way assembly.

[0007] As a further setting of the above scheme, one end of the fixed compression ring is provided with a flat part, and the other end is provided with a circular arc end face, and the elastic packing ring is provided with a pressure groove opposite to the circular arc end face.

[0008] As a further setting of the above scheme, the diaphragm subassembly includes a mounting part fixed with the pressure cylinder, a diaphragm part movably arranged opposite to the mounting part, the diaphragm part clamps a diaphragm sheet, and the diaphragm part further abuts a spring part.

[0009] As a further feature of the above scheme, the pump body includes a medium inlet and a medium outlet, and a one-way plug and an elastic element are respectively provided in the medium inlet and the medium outlet.

[0010] Beneficial effects: The plunger metering pump of this utility model, by setting large and small plunger heads and flow channels, lubricates the plunger by introducing oil in the liquid chamber. Firstly, it reduces wear on the reciprocating parts. Secondly, the oil coats the plunger and packing, and through continuous circulation based on their reciprocating movement, it cools the packing and plunger, thereby improving the durability of the plunger assembly inside the pump and extending the service life of the plunger pump. Attached Figure Description

[0011] Fig. 1 This is a schematic diagram of the diaphragm plunger metering pump of this utility model.

[0012] Fig. 2 This is a schematic diagram of the metering pump of this utility model during operation.

[0013] Fig. 3 This is a schematic diagram of the sealing ring and sealing filler structure in this embodiment.

[0014] Reference numerals: 1. Pressure cylinder; 2. Pump body; 21. Medium inlet; 22. Medium outlet; 23. One-way plug; 24. Elastic element; 3. Liquid chamber; 4. Medium chamber; 5. Diaphragm assembly; 51. Mounting part; 52. Diaphragm element; 53. Diaphragm sheet; 54. Spring element; 6. Piston assembly; 61. Plug cylinder; 611. Opening; 62. Plug; 621. Large plug head; 622. Rod part; 623. Large packing ring; 624. Small packing ring; 63. Sealing packing; 64. One-way assembly; 65. Elastic packing ring; 66. Fixed pressure ring; 661. Arc end face; 662. Flat part; 663. Pressure groove; 67. Flow channel; 671. Outlet channel; 672. Inlet channel; 68. Radial hole. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0016] like Figs. 1-3The diaphragm type plunger metering pump shown comprises a pressure cylinder 1 and a pump body 2, the pressure cylinder 1 is provided with a liquid cavity 3, the pump body 2 is provided with a medium cavity 4, the liquid cavity 3 and the medium cavity 4 are provided with a diaphragm assembly 5, the liquid cavity 3 is further provided with a plunger assembly 6, the plunger assembly 6 comprises a plug barrel 61 fixedly sealed with the pressure cylinder 1, a columnar rod 62 connected with a power element at the rear end in the plug barrel 61, the columnar rod 62 and the plug barrel 61 are further provided with a sealing packing 63, the pressure cylinder 1 is provided with a flow channel 67, the flow channel 67 is communicated with a radial hole 68 provided on the sealing packing 63.

[0017] As a further arrangement of the above-mentioned scheme, the columnar rod 62 comprises a large head 621 and a rod part 622, the sealing packing 63 comprises a fixed compression ring 66 provided with the radial hole 68 and an elastic packing ring 65, the elastic packing ring 65 is provided with a large packing ring 623 and a small packing ring 624 respectively matched with the diameter of the large head 621 and the rod part 622.

[0018] As a further arrangement of the above-mentioned scheme, the opening 611 at the front end of the plug barrel 61 for the large head 621 to extend out is larger in diameter than the large head 621, the flow channel 67 comprises an inlet channel 672 and an outlet channel 671 opposite to the fixed compression ring 66 provided between the large packing ring 623 and the small packing ring 624, the flow channel 67 is further provided with a one-way assembly 64.

[0019] As a further arrangement of the above-mentioned scheme, one end of the fixed compression ring 66 is provided with a flat part 662, the other end is provided with a circular arc end face 661, the elastic packing ring 65 is provided with a pressing groove 663 opposite to the circular arc end face 661.

[0020] As a further arrangement of the above-mentioned scheme, the diaphragm assembly 5 comprises a mounting part 51 fixed with the pressure cylinder 1 and a diaphragm element 52 movably provided opposite to the mounting part 51, the diaphragm element 52 clamps a diaphragm sheet 53 thereon, the diaphragm element 52 further abuts a spring element 54 thereon.

[0021] As a further arrangement of the above-mentioned scheme, the pump body 2 comprises a medium inlet 21 and a medium outlet 22, the medium inlet 21 and the medium outlet 22 are respectively provided with a one-way plug 23 and an elastic element 24.

[0022] Reference Figs. 1-2The utility model discloses a plunger metering pump, through setting up the sealing packing 63, set up the size head structure to the column stem 62, and set up the flow channel 67, and the oil liquid in the liquid cavity 3 is introduced into the column stem 62 sealing interlayer, through the drive of reciprocating telescopic column stem 62 to liquid cavity 3, drive the diaphragm piece 53 to realize the transport of medium when extending, and the characteristics of oil liquid are given, under the pressure, oil liquid passes through radial hole 68 from the inlet 672 into the lubricating cavity, and when back pumping, extrude the oil liquid in the lubricating cavity and make it from the outlet 671 backflow to the liquid cavity 3, through the above-mentioned oil liquid flow, it can realize the lubrication of oil liquid to the column stem, and it can buffer the extension of the column stem 62, and the oil liquid can lubricate the front end of the large column head 621 through the opening 611 set up at the front end of the column stem 62.

[0023] As above-mentioned column stem 62 when extending, as Fig. 1 State to Fig. 2 The process lubricating cavity volume becomes big, and the oil liquid flows into the lubricating cavity from the inlet 672 based on negative pressure, and when reversing, the column stem 62 recovers the plunger pump from Fig. 2 to Fig. 1 State, the process large column head 621 extrudes into the lubricating cavity compression volume space, and the oil liquid backflows to the liquid cavity 3 from the outlet 671 based on pressure, and the diaphragm piece 53 acts, and the oil liquid flows slowly based on the small diameter of the flow channel 67, and will not affect the activity of the diaphragm piece 53, and the negative pressure and pressure formed by the oil liquid are relatively comfortable to the diaphragm assembly 5, and will not produce violent action, thereby avoiding the force of the diaphragm assembly 5 to the diaphragm piece 53 too severe damage.

[0024] The plunger metering pump of the embodiment can lubricate the column stem through the oil liquid in the liquid cavity, which can reduce the wear of reciprocating parts, and the oil liquid covers the column stem and the packing, and continuously circulates based on the reciprocating activity, thereby forming the cooling of the packing and the column stem, improving the use durability of the plunger assembly in the pump, and improving the service life of the plunger pump.

[0025] 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 its equivalent technology, the utility model also intends to include these modifications and variations.

Claims

1. A diaphragm piston metering pump characterized by: The utility model provides a pump, including pressure cylinder (1) and pump body (2), be equipped with liquid cavity (3) in pressure cylinder (1), be equipped with medium cavity (4) in pump body (2), be equipped with diaphragm subassembly (5) between liquid cavity (3) and medium cavity (4), liquid cavity (3) is still equipped with plunger subassembly (6), plunger subassembly (6) including with pressure cylinder (1) sealed fixed plug barrel (61), the column stem (62) of rear end connection power part in plug barrel (61), column stem (62) with plug barrel (61) between still be equipped with sealing packing (63), be equipped with flow channel (67) on pressure cylinder (1), flow channel (67) with the radial hole (68) of setting up on sealing packing (63) intercommunication.

2. A diaphragm-type piston metering pump according to claim 1, characterized in that: The column stem (62) includes a large head (621) and a rod part (622), the sealing packing (63) includes a fixed compression ring (66) with a radial hole (68) and an elastic packing ring (65), the elastic packing ring (65) is provided with a large packing ring (623) and a small packing ring (624) respectively matched with the diameters of the large head (621) and the rod part (622).

3. A diaphragm-type piston metering pump according to claim 2, characterized in that: The opening (611) of the plug barrel (61) for the large head (621) to extend has a diameter larger than that of the large head (621), the flow channel (67) includes an inlet channel (672) and an outlet channel (671) opposite to the fixed compression ring (66) arranged between the large packing ring (623) and the small packing ring (624), and the flow channel (67) is further provided with a one-way component (64).

4. A diaphragm-type piston metering pump according to claim 2, characterized in that: One end of the fixed compression ring (66) is provided with a flat portion (662), and the other end is provided with a circular arc end face (661), the elastic packing ring (65) is provided with a pressure groove (663) opposite to the circular arc end face (661).

5. A diaphragm-type piston metering pump according to claim 1, characterized in that: The diaphragm subassembly (5) includes a mounting portion (51) fixed to the pressure cylinder (1), a diaphragm member (52) movably arranged opposite to the mounting portion (51), the diaphragm member (52) clamps a diaphragm sheet (53), and the diaphragm member (52) further abuts a spring member (54).

6. A diaphragm-type piston metering pump according to claim 1, characterized in that: The pump body (2) includes a medium inlet (21) and a medium outlet (22), the medium inlet (21) and the medium outlet (22) are respectively provided with a one-way plug (23) and an elastic member (24).

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