Proportioning pump piston structure

Abstract

The invention relates to the technical field of proportioning pump devices, in particular to a proportioning pump piston structure. Comprising a liquid medicine cavity clamped below a mixing cavity, a screwing assembly is arranged below the liquid medicine cavity, a one-way valve body is arranged at the bottom of the screwing assembly, the upper portion of the mixing cavity is in threaded connection with a liquid discharging cavity, and a deflation valve head capable of exhausting air is installed at the top of the liquid discharging cavity; the inner walls of the liquid discharging cavity and the mixing cavity are clamped with an upper end cover and a cavity cylinder of a piston assembly through sealing rubber rings respectively, a lifting assembly is fixed to the piston assembly, a lever block is movably connected to the bottom of the lifting assembly, a connecting body and a limiting column are arranged at the left end and the right end of the lever block respectively, and a fixing block is fixed to the limiting column; a main shaft of the lever block is movably connected with the notch in the lower portion of the connecting body, and the main shaft extends out of the lever block in the left-right direction and is elastically connected with the transverse shaft on the other side through a coil spring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of proportional pump device, in particular to a proportional pump piston structure. BACKGROUND

[0002] As the core category of reciprocating volumetric pump, proportional pump undertakes the key function of precise medium (such as liquid medicine) delivery and proportioning in the industrial fields of agricultural irrigation, water treatment, etc. Its core characteristics are to achieve 0-100% stepless flow regulation through mechanical control and maintain constant flow characteristics regardless of discharge pressure. The typical precision control is within ±1%, and some high-precision models can reach the level of thousandth.

[0003] However, the prior art still has significant limitations in engineering practice: structural complexity and maintenance cost, reciprocating mechanical structure involves precise gears, packing seals, check valves and other components, long downtime for maintenance, and extremely complex disassembly and installation, affecting production continuity. SUMMARY

[0004] In order to make up for the deficiencies in the prior art and achieve the above functions, a proportional pump piston structure is provided.

[0005] The present application is achieved by the following technical solutions: A proportional pump piston structure, comprising a liquid medicine cavity connected to the lower part of a mixing cavity, a screwing assembly is arranged below the liquid medicine cavity, a one-way valve body is arranged at the bottom of the screwing assembly, the mixing cavity is threadedly connected to the upper part of a liquid discharge cavity, and a gas discharge valve head capable of discharging gas is installed at the top of the liquid discharge cavity; The inner walls of the liquid discharge cavity and the mixing cavity are respectively connected to the upper end cover and the cavity cylinder of a piston assembly through sealing rubber rings, a vibration lifting assembly is fixed on the piston assembly, a lever block is movably connected to the bottom of the vibration lifting assembly, a connecting body and a limiting column are arranged at the left and right ends of the lever block, a fixed block is fixed on the limiting column, horizontal shafts are arranged at the left and right ends of the fixed block, the main shaft of the lever block is movably connected to the notch below the connecting body, and the main shaft extends out of the lever block and is elastically connected to the horizontal shaft on the other side through a coil spring; A clamping groove is arranged at the top of the connecting body and the plug assembly above is clamped through the clamping groove; The bottom of the piston assembly is clamped with a piston column, the bottom of the piston column is a piston head, the piston head is in interference fit with the inner wall of the screwing assembly through an O-ring, and the upper half of the inner wall of the liquid medicine cavity is not in contact.

[0006] Further, a cavity is arranged between the outer wall and the inner wall of the screwing assembly, and an inner thread is arranged on the outer inner wall of the cavity and engaged with the outer thread of the liquid medicine cavity. The outer thread of the medicine liquid cavity is provided with two opposite vertical sections, the distance between the vertical sections is less than the diameter of the outer thread, the screwing assembly is provided with a through hole, and the two u-shaped locks are inserted into the through hole and are in clearance fit with the vertical plane.

[0007] Further, the medicine liquid cavity is locked by a bottom support cover a which is connected to the bottom of the mixing cavity through screwing.

[0008] Further, the outer surface of the mixing cavity is printed with a guide mark, and a water inlet and a liquid outlet which are in communication with the mixing cavity are arranged according to the guide mark, and both are provided with external threads and can be closed by end covers.

[0009] Further, the end face of the upper end cover is provided with two through holes vertically penetrating the upper end cover, the bottom of the plug assembly is provided with a spring a, the plug assembly is elastically connected to the spring a and the blocking block below through the telescopic rod, and the plug assembly is in position correspondence with the two through holes.

[0010] Further, the two plug assemblies are connected by a transverse liquid discharge assembly, the liquid discharge assembly is transversely arranged above the piston assembly, is vertically clamped with the connecting column through the weighing shaft arranged in the liquid discharge assembly, the bottom of the connecting column is clamped with the connecting body, the lower half of the connecting column is a clamping groove structure, the diameter of the clamping groove structure is greater than the diameter of the upper part, and an O-shaped ring is arranged on the clamping groove structure to block the corresponding through hole of the upper end cover.

[0011] Further, the lifting assembly is fixed on the piston assembly through bolts, the lifting assembly comprises a lifting main body, a sleeve which is clamped with the piston assembly is arranged at the middle position of the lifting main body, the lower half of the lifting assembly is a vertical plate with a flat plate structure, one end of the vertical plate is a hollow clamping cavity, a through hole a penetrating the vertical plate is arranged on the clamping cavity, and the fixing block can be displaced up and down in the clamping cavity as a sliding block. A positioning pin is arranged in the through hole, the two sides of the main shaft of the lever block are convex blocks, through holes b are arranged on the convex blocks, and the through hole a and the through hole b are coaxial through the insertion of the positioning pin. The lifting assembly is further provided with a limiting cylinder which can clamp the limiting column.

[0012] Further, the two convex blocks are located in the cavity cylinder of the piston assembly and are located on the two sides of the vertical plate.

[0013] Further, the bottom of the lifting assembly is provided with a positioning groove which is clamped with the top of the piston column. The slot below the connecting body is rectangular, and the main shaft can be displaced up and down in the slot.

[0014] The beneficial effects of the present application are: The overall structure of the present application can be designed compactly, can realize grading and proportional matching of the liquid medicine, is convenient to disassemble, has very low maintenance cost and has long service life. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is an overall structure three-dimensional view of the present application; Figure 2 It is an internal schematic view of the present application; Figure 3 It is Figure 2 It is a schematic view after removing the piston assembly; Figure 4 It is one of the half-section schematic views of the present application; Figure 5 It is the second half-section schematic view of the present application; Figure 6 It is a three-dimensional schematic view of the lifting assembly; Figure 7 It is a three-dimensional schematic view of the lever block; Figure 8 And Figure 9 It is an assembly schematic view of the lifting assembly and its adjacent assembly.

[0016] In the drawings: 1, liquid discharge cavity, 101, air release valve head, 2, mixing cavity, 201, guide mark, 202, water inlet, 203, liquid discharge port, 204, end cover, 3, bottom cover a, 4, liquid medicine cavity, 5, screw assembly, 501, U-shaped lock, 6, bottom cover b, 601, liquid suction port, 602, one-way valve body, 7, limiting column, 701, fixed block, 702, horizontal shaft, 8, coil spring, 9, liquid discharge assembly, 901, spring a, 902, blocking block a, 903, connecting body, 904, plug assembly, 905, load-bearing shaft, 906, connecting column, 10, piston column, 1001, piston head, 11, piston assembly, 1101, sealing rubber ring, 1102, upper end cover, 1103, cavity cylinder, 12, lifting assembly, 1201, lifting main body, 1202, sleeve, 1203, limiting cylinder, 1204, vertical plate, 1205, positioning groove, 1206, through hole a, 1207, clamping cavity, 13, lever block, 1301, main shaft, 1302, convex edge block, 1303, through hole b. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0019] Reference Figures 1 to 9 The present application comprises a liquid medicine cavity 4 clamped below the mixing cavity 2 for sucking liquid medicine from the bottom, and a screwing assembly 5 is arranged below the liquid medicine cavity 4, and a one-way valve body 602 is arranged at the bottom of the screwing assembly 5. The structure of the one-way valve body 602 is a prior art, but it is not described in detail, which is only to allow the liquid medicine to enter from the bottom, but not to return. The mixing cavity 2 is threadedly connected with the liquid discharge cavity 1 above, and a gas release valve head 101 capable of discharging gas is mounted at the top of the liquid discharge cavity 1 to release pressure; The liquid discharge cavity 1 and the inner wall of the mixing cavity 2 are respectively clamped by a sealing rubber ring 1101 and an upper end cover 1102 and a cavity barrel 1103 of a piston assembly 11. The piston assembly 11 is fixed with a lifting assembly 12 as an assembly medium for various connections. The bottom of the lifting assembly 12 is movably connected with a lever block 13, and the left and right ends of the lever block 13 are respectively provided with a connecting body 903 and a limiting column 7. The limiting column 7 is fixed with a fixed block 701, and the left and right ends of the fixed block 701 are provided with horizontal shafts 702. The main shaft 1301 of the lever block 13 is movably connected with the notch below the connecting body 903. The main shaft 1301 extends left and right out of the lever block 13 and is elastically connected with the horizontal shaft 702 on the other side through a coil spring 8. The connecting body 903 is provided with a clamping groove at the top and is clamped with the plug assembly 904 above through the clamping groove. The bottom of the piston assembly 11 is clamped with a piston column 10, which is driven to move up by the water pressure entering through the water inlet 202. The bottom of the piston column 10 is a piston head 1001, which is in interference fit with the inner wall of the screwing assembly 5 through an O-ring and does not contact the inner wall of the upper half of the liquid medicine cavity 4, as a piston pump structure moves up to generate suction force on the one-way valve body 602 to suck liquid. A cavity is provided between the outer wall and the inner wall of the screw assembly 5, and an inner thread is provided on the outer inner wall of the cavity to engage with the outer thread of the liquid medicine cavity 4. By rotating the screw assembly 5 to move it up and down, the overall length of the lower half of the liquid medicine cavity 4 is changed. Figure 4 .

[0020] The external thread of the liquid medicine cavity 4 is provided with two opposite vertical sections, the spacing between the vertical sections is smaller than the diameter of its external thread, and a through hole is provided on the screwing component 5. The upper and lower U-shaped locks 501 are inserted into the through hole and fit with the vertical plane to lock the position of the screwing component 5.

[0021] A liquid suction port 601 is provided below the one-way valve body 602 for communicating with the external liquid medicine or mixed solution. The one-way valve body 602 is locked by the bottom support cover b6 threadedly connected to the bottom of the screw assembly 5, and the liquid medicine cavity 4 is locked by the bottom support cover a3 threadedly connected to the bottom of the mixing cavity 2.

[0022] The outer surface of the mixing cavity 2 is printed with a guide mark 201 , and a water inlet 202 and a liquid outlet 203 connected to the mixing cavity 2 are respectively provided according to the guide mark 201 , and both are provided with external threads and can be closed using an end cover 204 .

[0023] The end surface of the upper end cover 1102 is provided with two through holes that pass through the upper and lower parts. A spring a901 is provided below the plug assembly 904. The plug assembly 904 is elastically connected to the blocking block 902 below through a telescopic rod and the spring a901. The plug assembly 904 corresponds to the position of the two through holes. Figure 3 、 Figure 5 , used to prevent the mixed liquid from entering the upper part.

[0024] refer to Figures 4 to 9 There is one plug assembly 904 on each side, and they are connected by a horizontal drainage assembly 9. The drainage assembly 9 spans above the piston assembly 11, and plays a role in limiting the up and down displacement. The weighing shaft 905 arranged inside it is vertically connected with the connecting column 906. The bottom of the connecting column 906 is connected with the connector 903. The lower half of the connecting column 906 is a bracket structure. The diameter of the bracket structure is larger than the upper diameter. An O-ring is installed on the bracket structure, which can block the through hole corresponding to the upper end cover 1102 to achieve the purpose of sealing.

[0025] The boosting assembly 12 is bolted to the piston assembly 11, the boosting assembly 12 comprises a boosting body 1201, a sleeve 1202 is arranged in the middle of the boosting body 1201 and is clamped with the piston assembly 11, the lower half of the boosting assembly 12 is a vertical plate 1204 with a flat plate structure, one end of the vertical plate 1204 is a hollow clamping cavity 1207, a through hole a 1206 penetrating the vertical plate 1204 is arranged on the clamping cavity 1207, and the fixing block 701 can be displaced up and down in the clamping cavity 1207 as a sliding block; A positioning pin is arranged in the through hole 1206, the two sides of the main shaft 1301 of the lever block 13 are convex edge blocks 1302, the convex edge blocks 1302 are both provided with through holes b 1303, and the through hole a 1206 and the through hole b 1303 are coaxial by inserting the positioning pin; The boosting assembly 12 is also provided with a limiting cylinder 1203 capable of clamping the limiting column 7 and is constrained thereby.

[0026] The two convex edge blocks 1302 are located in the cavity cylinder 1103 of the piston assembly 11 and are located on both sides of the vertical plate 1204.

[0027] The bottom of the boosting assembly 12 is provided with a positioning groove 1205 clamped with the top of the piston column 10; The slot below the connecting body 903 is rectangular, the main shaft 1301 can be displaced up and down in the slot as a driving device for adjusting the up and down position of the drainage assembly 9.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application, and other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered in the scope of the claims of the present application as long as they do not deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A proportional pump piston structure, comprising a liquid medicine chamber (4) clamped below a mixing chamber (2), characterized in that: A screw assembly (5) is provided below the liquid medicine cavity (4), a one-way valve body (602) is provided at the bottom of the screw assembly (5), the top of the mixing cavity (2) is threadedly connected to the drainage cavity (1), and a venting valve head (101) capable of exhausting air is installed at the top of the drainage cavity (1); The inner walls of the liquid discharge cavity (1) and the mixing cavity (2) are respectively connected to the upper end cover (1102) and the cavity tube (1103) of the piston assembly (11) through a sealing rubber ring (1101), and a lifting assembly (12) is fixed on the piston assembly (11), and a lever block (13) is movably connected to the bottom of the lifting assembly (12), and the left and right ends of the lever block (13) are respectively provided with a connector (903) and a limit column (7), and a fixed block (701) is fixed on the limit column (7), and the left and right ends of the fixed block (701) are both provided with a horizontal axis (702), and the main shaft (1301) of the lever block (13) is movably connected to the notch below the connector (903), and the main shaft (1301) extends left and right from the lever block (13) and is elastically connected to the horizontal axis (702) on the other side through a coil spring (8); The connector (903) is provided with a slot on the top thereof and is connected to the plug assembly (904) above via the slot; The bottom of the piston assembly (11) is snap-fitted to the piston column (10), and the bottom of the piston column (10) is a piston head (1001). The piston head (1001) is interference-fitted with the inner wall of the screw assembly (5) via an O-ring and does not contact the inner wall of the upper half of the liquid medicine cavity (4).

2. The proportional pump piston structure according to claim 1, characterized in that: A cavity is provided between the outer wall and the inner wall of the screw assembly (5), and an inner thread that meshes with the outer thread of the liquid medicine cavity (4) is provided on the inner wall of the cavity. The external thread of the liquid medicine cavity (4) is provided with two opposite vertical sections, the distance between the vertical sections is smaller than the diameter of the external thread, and the screwing component (5) is provided with a through hole, and the upper and lower U-shaped locks (501) are inserted into the through hole and are spaced apart from the vertical plane.

3. The proportional pump piston structure according to claim 1, characterized in that: A liquid suction port (601) is provided below the one-way valve body (602), and the one-way valve body (602) is locked by a bottom support cover b (6) threadedly connected to the bottom of the screw assembly (5), and the liquid medicine cavity (4) is locked by a bottom support cover a (3) threadedly connected to the bottom of the mixing cavity (2).

4. The proportional pump piston structure according to claim 1, characterized in that: A guide mark (201) is printed on the outer surface of the mixing cavity (2), and a water inlet (202) and a liquid discharge port (203) connected to the mixing cavity (2) are respectively provided according to the guide mark (201), and both are provided with external threads and can be closed using an end cap (204).

5. The proportional pump piston structure according to claim 1, characterized in that: Two through holes extending vertically therethrough are provided on the end surface of the upper end cover (1102), a spring a (901) is provided below the plug assembly (904), the plug assembly (904) is elastically connected to the blocking block (902) below via a telescopic rod and the spring a (901), and the plug assembly (904) corresponds to the positions of the two through holes.

6. The proportional pump piston structure according to claim 5, characterized in that: There is one plug assembly (904) on each side, and they are connected by a horizontal drainage assembly (9). The drainage assembly (9) spans above the piston assembly (11) and is vertically connected to the connecting column (906) through the weighing shaft (905) arranged inside it. The bottom of the connecting column (906) is connected to the connector (903). The lower half of the connecting column (906) is a card support structure. The diameter of the card support structure is larger than the upper diameter. An O-ring is installed on the card support structure to block the corresponding through hole of the upper end cover (1102).

7. The proportional pump piston structure according to claim 1, characterized in that: The lifting assembly (12) is fixed to the piston assembly (11) by bolts. The lifting assembly (12) includes a lifting body (1201). A sleeve (1202) is provided in the middle of the lifting body (1201) and is engaged with the piston assembly (11). The lower half of the lifting assembly (12) is a vertical plate (1204) of a flat structure, and one end of the vertical plate (1204) is a hollow card cavity (1207). The card cavity (1207) is provided with a through hole a (1206) that penetrates the vertical plate (1204). The fixed block (701) acts as a slider and can move up and down in the card cavity (1207). A positioning pin is provided in the through hole (1206), and convex blocks (1302) are provided on both sides of the main shaft (1301) of the lever block (13), and a through hole b (1303) is provided on each of the convex blocks (1302). The through hole a (1206) and the through hole b (1303) are connected to the same axis by inserting the positioning pin. The lifting assembly (12) is also provided with a limiting cylinder (1203) capable of engaging with the limiting column (7).

8. The proportional pump piston structure according to claim 7, characterized in that: The two convex edge blocks (1302) are located in the cavity (1103) of the piston assembly (11) and on both sides of the vertical plate (1204).

9. The proportional pump piston structure according to claim 1, characterized in that: The bottom of the lifting component (12) is provided with a positioning groove (1205) that is engaged with the top of the piston column (10); The notch below the connector (903) is rectangular, and the main shaft (1301) can slide up and down in it.

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