A micro-flow high-pressure hydraulic diaphragm metering pump

Abstract

The application discloses a kind of micro flow high pressure hydraulic diaphragm metering pump, including pump head and pump body, diaphragm piece is equipped between the pump head and pump body, pump head, including pump head body, feed valve and discharge valve;Pump body, including pump body and plunger assembly, plunger assembly is driven to diaphragm piece by reciprocating motion, plunger assembly includes cylinder sleeve, cylinder sleeve inside is equipped with plunger cavity, plunger cavity is equipped with plunger in cooperation, at least one oil supplement cavity is equipped in plunger cavity, plunger and cylinder sleeve are also equipped with combined sealing mechanism between it.The application is optimized plunger assembly, utilizes long axis plunger, forms small capacity hydraulic oil cavity, with the rapid reciprocating motion of plunger, can realize the high frequency small scale reciprocating operation of diaphragm piece, is suitable for the transmission of small size gauge medium flow passage in pump head, realizes micro high pressure output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metering pump, in particular to a micro flow high pressure hydraulic diaphragm metering pump. BACKGROUND

[0002] Metering pump is widely used in chemical industry, oil refining, pharmaceutical, power, papermaking, food, urban water supply, industrial water, environmental protection and other occasions. The metering pump belongs to a kind of volumetric pump, and is divided into two categories of plunger pump and diaphragm pump, and the diaphragm pump can be divided into hydraulic diaphragm pump and mechanical diaphragm pump. The hydraulic diaphragm pump can be divided into metal diaphragm metering pump and non-metal diaphragm metering pump due to different diaphragm materials, and the products used in the domestic and foreign markets at present are mainly non-metal diaphragm metering pump. The main features of the metering pump are accurate measurement, high output pressure and stepless flow adjustment. The main features of the plunger type metering pump are simple structure, high output pressure, but easy to leak. The main features of the hydraulic diaphragm metering pump are complex structure, good sealing and no leakage, so it is widely used in toxic, corrosive, flammable and explosive occasions.

[0003] In addition, in the fields of chemical industry, medicine and chromatographic analysis, micro metering pump is usually applied, and the accuracy requirement is extremely strict, so that the transmission of trace medium is required, and the liquid flow of delivery is usually 0.1-0.5L / h, so that the size of the flow channel of the metering pump is usually small, and the size of the flow channel is usually 3mm-5mm. In order to realize the transmission of trace medium and maintain high pressure delivery, the requirement of the metering pump is relatively high, so how to realize high pressure delivery in the process of trace transmission is one of the research focuses of the micro metering pump. SUMMARY

[0004] In view of the above problems, the present application aims to provide a micro flow high pressure hydraulic diaphragm metering pump, which optimizes the plunger assembly and can realize high pressure micro output of the metering pump.

[0005] The technical problem solved by the present application can be realized by the following technical scheme:

[0006] The application discloses a micro-flow high-pressure hydraulic diaphragm metering pump, which comprises a pump head and a pump body, a diaphragm is arranged between the pump head and the pump body, the pump head comprises a pump head body, an inlet valve and an outlet valve which are arranged on the pump head body, a medium flow channel is arranged in the pump head body, and the diameter of the medium flow channel is not greater than 5 mm; the pump body comprises a pump body body and a plunger assembly arranged in the pump body body, the plunger assembly drives the diaphragm through reciprocating movement, the plunger assembly comprises a cylinder sleeve, a plunger cavity is arranged in the cylinder sleeve, a plunger is arranged in the plunger cavity in a matched mode, at least one oil supplement cavity is arranged in the plunger cavity, the oil supplement cavity is annularly arranged outside the plunger shaft body in a ring shape, and a combined sealing mechanism is further arranged between the plunger and the cylinder sleeve; the combined sealing mechanism comprises a compression ring, sealing packing and a top cap, one end of the compression ring is used to abut against a resisting wall in the cylinder sleeve in a matched mode, the other end of the compression ring is used to be matched with the sealing packing, the other end of the sealing packing is abutted against the top cap in a matched mode, the plunger penetrates through the combined sealing mechanism, the inner end surface of the sealing packing is attached to the surface of the plunger shaft body, and a filling sealing cavity is formed between the sealing packing and the resisting wall.

[0007] The sealing packing comprises a packing body, a flared ring wall and a slot cavity, the slot cavity is used to be matched with the compression ring, and the flared ring wall can be expanded radially outward when the compression ring continuously abuts against the slot cavity.

[0008] The filling sealing cavity is used to fill a gelatinous sealing medium, the number of the oil supplement cavities is 2-5, and the oil supplement cavities are arranged at equal intervals.

[0009] The compression ring comprises a ring seat and a compression ring part, the compression ring part is used to be matched with the slot cavity, and the thickness size of the compression ring part is greater than the size of the slot cavity.

[0010] The flared ring wall comprises an outer ring flared ring wall and an inner ring flared ring wall, the outer ring flared wall is used to abut against the inner wall of the cylinder sleeve, and the inner ring flared wall is used to abut against the plunger shaft body.

[0011] A plunger through hole is arranged in the middle of the sealing packing, the plunger through hole adjacent to the end of the top cap is a large hole end, and the plunger through hole adjacent to the end of the compression ring is a small hole end.

[0012] The sealing packing is made of a tetrafluoro material.

[0013] The diaphragm is installed between the pump head and the pump body through matched first and second lining plates, the first lining plate is arranged at the pump head, the second lining plate is arranged at the pump body, a plurality of medium channels are arranged in the first lining plate, and a plurality of hydraulic flow channels are arranged in the second lining plate.

[0014] The second lining plate and the plunger assembly form a hydraulic oil cavity, the second lining plate and the diaphragm piece form a diaphragm oil cavity, the diaphragm oil cavity and the hydraulic oil cavity are connected through a hydraulic flow channel, and the volume of the hydraulic oil cavity changes with the reciprocating movement of the plunger.

[0015] The second lining plate is provided with a hydraulic flow channel groove, a plurality of hydraulic flow channels are arranged in the hydraulic flow channel groove, the hydraulic flow channel groove is located on the side wall of the second lining plate adjacent to the plunger assembly, a pressure relief flow channel and a pressure compensation flow channel are arranged in the pump body, the hydraulic flow channel groove is communicated with the pressure relief valve through the pressure relief flow channel, and the hydraulic flow channel groove is communicated with the oil supplement valve through the pressure compensation flow channel.

[0016] Compared with the prior art, the present application has the following advantages: the present application optimizes the plunger assembly, uses a long-axis plunger, forms a small-capacity hydraulic oil cavity, and can realize high-frequency small-scale reciprocating operation of the diaphragm piece with the rapid reciprocating movement of the plunger, is suitable for the transmission of a small-specification medium flow channel in the pump head, and realizes micro high-pressure output; the combined sealing mechanism is optimized, and the oil supplement cavity is combined to ensure the stability and reliability of the reciprocating movement of the long-axis plunger.

[0017] The features of the present application can be clearly understood by referring to the drawings and the detailed description of the preferred embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of the overall sectional structure of the present application Figure 1 ;

[0019] Figure 2 is a schematic view of the overall sectional structure of the present application Figure 1 A part of the present application

[0020] Figure 3 is a schematic view of the sectional structure of the pump head and the pump body of the present application

[0021] Figure 4 is a schematic view of the overall sectional structure of the present application Figure 3 B part of the present application

[0022] Figure 5 is a schematic view of the overall sectional structure of the present application Figure 2 ;

[0023] Figure 6 is a schematic view of the overall structure of the present application

[0024] Figure 7 is a schematic view of the sectional structure of the cylinder sleeve of the present application

[0025] Figure 8 is a schematic view of the sectional structure of the plunger and the combined sealing mechanism of the present application

[0026] Figure 9 This is a schematic diagram of the second liner structure of the present invention;

[0027] Figure 10 This is a schematic diagram of the sealing packing structure of the present invention;

[0028] Figure 11 This is a schematic cross-sectional view of the sealing packing structure of the present invention;

[0029] Figure 12 This is a cross-sectional view of the micro-flow check valve of the present invention;

[0030] Figure 13 This is a cross-sectional view of the oil replenishment valve of the present invention. Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0032] Combined with appendix Figures 1 to 13 As shown, this embodiment discloses a micro-flow high-pressure hydraulic diaphragm metering pump, including a pump head and a pump body, with a diaphragm component provided between the pump head and the pump body;

[0033] The pump head 100 includes a pump head body, an inlet valve 110 and an outlet valve 120 disposed on the pump head body. The pump head body is provided with a medium flow channel 130, the diameter of which is no more than 5mm. The inlet valve 110 is used to receive and transmit the medium, and the outlet valve 120 is used to connect to the equipment that completes high-pressure micro-transmission, so as to realize the micro-high-pressure transmission of the medium.

[0034] Both the feed valve 110 and the discharge valve 120 are small-flow check valves, combined with Figure 12 As shown, the preferred one-way valve adopts a double-ball valve hard sealing structure. In the specific structure, it includes a first valve body 111, a first valve cavity 115 is provided in the first valve body 111, three first valve seats 113 are arranged at intervals in the first valve cavity 115, a first valve core 112 is provided between two adjacent first valve seats 113, and a first valve ball 114 is provided in the first valve core 112. The first valve ball 114 is preferably made of ceramic valve ball material. The first valve seat 113 includes a first valve seat body 117, a first valve seat flow channel 116 located in the first valve seat body 117, and a sealing ring seat 118 located on the outer ring of the first valve seat body 117. The sealing ring seat 118 has sealing protrusions on the upper and lower surfaces, and the sealing protrusions have a conical or frustum-shaped cross section.

[0035] In the structure, the hard sealing structure is used, preferably the sealing convex structure feature, the taper or frustum structure is closely attached to the plane to realize good sealing, the first valve seat structure is optimized, the double-sided first valve seat structure is used, the first valve seat can realize better double-sided, and the service life is improved.

[0036] Wherein, the pump body 200, comprising pump body 210, 210 is arranged in the plunger assembly 600 in the plunger assembly 600 is driven to the diaphragm piece 800 through reciprocating motion, wherein the plunger 620 in the plunger assembly 600 is connected through the connecting shaft 530, the other end of the connecting shaft 530 is connected with the pull rod shaft 520, the pull rod shaft 520 is realized reciprocating transmission through the cam swing arm 510, the cam swing arm 510 is usually matched with motor shaft 410 to realize transmission, and the motor shaft 410 is completed output through the motor 400;Wherein, preferably, the cam swing arm 510 is usually matched with the plunger adjusting mechanism 300, to realize the adjustment of the position of the cam swing arm 510, realize the adjustment of the extension amount of the plunger 620, thereby realizing the adjustment of the volume of the hydraulic oil cavity 250, to adapt to different metering adjustment.

[0037] Preferably, the plunger assembly 600 comprises a cylinder sleeve 610, the pump body 210 is internally provided with an assembly cavity, the cylinder sleeve 610 is fixedly and matchingly installed with the assembly cavity, the cylinder sleeve 610 is internally provided with a plunger cavity 612, the plunger cavity 612 is internally provided with a plunger 620, the plunger 620 is reciprocatingly movable along the plunger cavity 612, the plunger cavity 612 is internally provided with at least one oil supplement cavity 611, the oil supplement cavity 611 is annularly arranged outside the plunger 620, the number of the oil supplement cavity 611 is 2-5, preferably 3, the oil supplement cavity 611 is equidistantly spaced, and the oil supplement cavity 611 is filled with lubricating oil, so that the plunger 620 is more smoothly movable along the plunger cavity 612.

[0038] Preferably, the combined sealing mechanism 700 is further arranged between the plunger 620 and the cylinder sleeve 610, and a sealing assembly cavity 613 is correspondingly arranged outside the other end of the plunger cavity 612, which is used to assemble and install the combined sealing mechanism 700. The combined sealing mechanism 700 includes a compression ring 710, a sealing packing 720, and a top cap 730. The compression ring 710 includes a ring seat 711 and a compression ring portion 712. The ring seat 711 at one end of the compression ring 710 is used to abut and cooperate with the abutment wall 614 in the cylinder sleeve 610. The other end of the compression ring 710 is used to cooperate with the sealing packing 720. Specifically, the compression ring portion 712 is used to achieve close fitting with the sealing packing 720. The other end of the sealing packing 720 abuts and cooperates with the top cap 730, which limits the sealing packing 720 through the top cap 730. The top cap 730 is usually directly fastened and installed with the cylinder sleeve 610, which can be screw fastening installation. The top cap 730 can also be installed on the machine body to limit the sealing packing 720. The plunger 620 penetrates the combined sealing mechanism 700 and continuously extends to the diaphragm 800, which is embedded in the plunger cavity 612. The inner end surface of the sealing packing 720 is fitted to the shaft surface of the plunger 620. The sealing packing 720 and the abutment wall 614 form a filling sealing cavity 740, which is filled with a gel-like sealing medium to form a flexible sealing structure.

[0039] In the specific structure, the compression ring portion 712 is used to cooperate with the embedded groove cavity 723, and the thickness of the compression ring portion 712 is greater than the groove size of the embedded groove cavity 723. The flared ring wall includes an outer ring flared wall 725 and an inner ring flared wall 724. The outer ring flared wall 725 is used to abut on the inner wall of the cylinder sleeve 610, and the inner ring flared wall 724 is used to abut on the shaft of the plunger 620. If the compression ring portion 712 continuously abuts with the embedded groove cavity 723, the embedded groove cavity 723 expands outward, and the flared ring wall deforms. The flared ring wall expands outward along the radial direction, so that the outer ring flared wall 725 and the inner wall of the cylinder sleeve 610 are more closely fitted, increasing the sealing effect. The inner ring flared wall 724 and the shaft of the plunger 620 are more closely fitted, increasing the sealing effect. In the long-term use process, the flared ring wall structure is preferably designed, and the tight secondary fitting can be achieved by the top cap 730. With the penetration of leakage in the filling sealing cavity 740, internal extrusion occurs, which also causes the flared ring wall to expand outward, increasing the overall sealing performance.

[0040] In combination with the above, preferably, the design adopts a flexible sealing structure formed by filling the sealing cavity with a gel-like sealing medium, and a hard sealing structure with an outward expansion type is realized by combining the sealing filler, thereby realizing a double-layer sealing structure and greatly ensuring the sealing effect of the reciprocating movement of the plunger.

[0041] Preferably, the sealing filler 720 is provided with a plunger through hole 722 in the middle, the plunger through hole 722 adjacent to the end of the top cap 730 is a large hole end, and the plunger through hole 722 adjacent to the end of the compression ring is a small hole end. The structure of the plunger through hole 722 is optimized to make the plunger 620 cooperate more closely with the sealing filler 720, which is beneficial to increase the sealing effect. The sealing filler 720 is preferably made of a fluorine material.

[0042] In combination with the above, the diaphragm piece 800 is installed between the pump head 100 and the pump body 200 by cooperating with the first lining plate 140 and the second lining plate 240. The first lining plate 140 is located at the pump head 100, and the second lining plate 240 is located at the pump body 200. The first lining plate 140 is provided with a plurality of medium channels 141, which are used to communicate with the medium flow channel 130 in the pump head 100 to realize the transmission of the medium. The second lining plate 240 is provided with a plurality of hydraulic flow channels 241. The second lining plate 240 and the plunger assembly 600 form a hydraulic oil cavity 250 therebetween, and the second lining plate 240 and the diaphragm piece 800 form a diaphragm oil cavity 260 therebetween. The diaphragm oil cavity 260 and the hydraulic oil cavity 250 communicate through the hydraulic flow channels 241. The hydraulic oil cavity 250 changes in volume along with the reciprocating movement of the plunger 620, causing the hydraulic oil in the diaphragm oil cavity 260 to expand and retract, thereby enabling the diaphragm piece 800 to complete reciprocating movement and driving the medium in the pump head 100 to realize transmission.

[0043] The second lining plate 240 is provided with a hydraulic flow channel groove 242, and a plurality of hydraulic flow channels 241 are arranged in the hydraulic flow channel groove 242. The hydraulic flow channel groove 242 is located on the side wall of the second lining plate 240 adjacent to the plunger assembly 600. The pump body 210 is provided with a pressure relief flow channel 211 and a pressure compensation flow channel 212. The hydraulic flow channel groove 242 communicates with the pressure relief valve 220 through the pressure relief flow channel 211 to realize pressure relief operation. The hydraulic flow channel groove 242 communicates with the oil supplement valve 230 through the pressure compensation flow channel 212 to realize oil supplement.

[0044] The pressure relief valve 220 is an integrated overload exhaust valve. The pump body 210 is provided with a mounting cavity for fixed cooperation. The pressure relief valve 220 is partially embedded and fixedly installed in the mounting cavity to realize integrated fixed installation.

[0045] In combination with the above, Figure 13As shown, the oil supplement valve 230 adopts a trace oil supplement valve for a hydraulic diaphragm metering pump with a hard valve ball, comprising a second valve body 231 which is directly installed in cooperation with the pump body 210 through threaded cooperation, a second valve cavity 232 is arranged in the second valve body 231, a valve core assembly is arranged in cooperation in the second valve cavity 232, the valve core assembly comprises a second valve seat 233, a hard valve ball 237, a spring member 236 and a valve ball seat 235, an oil supplement flow channel 232 is arranged in the second valve seat 233, an oil sealing port 238 is arranged adjacent to the hard valve ball 237 at the oil supplement flow channel 232, the hard valve ball 237 abuts against the oil sealing port 238 through the spring member 236, a sealing gasket 234 is arranged between the second valve seat 233 and the valve ball seat 235, and the sealing gasket 234 is made of red copper.

[0046] In combination with the above, the oil supplement valve 230 optimally adopts a hard valve ball cooperating with a hard valve seat, and particularly preferably adopts a ceramic valve ball, so as to realize high-precision trace flow channel cooperation and installation, and optimally arrange a sealing gasket structure to reduce the wear of the valve seat on the valve ball seat.

[0047] The present application optimizes the plunger assembly, utilizes a long shaft-shaped plunger to form a small capacity hydraulic oil cavity, and can realize high-frequency small-scale reciprocating operation of the diaphragm member with rapid reciprocating movement of the plunger, is suitable for transmission of a small size medium flow channel in the pump head, realizes trace high-pressure output, and the highest pressure can reach 20Mpa, wherein the flow rate is kept at 0.1-0.5L / h, and the precision of the present application can be controlled at ±1% after optimization.

[0048] The above is only a preferred embodiment of the present application, and does not limit the application in any form, and any simple modification, equivalent change or modification made according to the technical principles of the present application to the above embodiment still belongs to the scope of the technical solutions of the present application.

Claims

1. A micro flow high pressure hydraulic diaphragm metering pump comprising a pump head and a pump body, a diaphragm member is arranged between the pump head and the pump body, characterized in that: The pump head comprises a pump head body, a feeding valve and a discharging valve arranged on the pump head body, and a medium flow channel is arranged in the pump head body, and the diameter of the medium flow channel is not greater than 5 mm; the pump body comprises a pump body body and a plunger assembly arranged in the pump body body, the plunger assembly drives the diaphragm member through reciprocating movement, the plunger assembly comprises a cylinder sleeve, a plunger cavity is arranged in the cylinder sleeve, a plunger is arranged in the plunger cavity in a matched mode, at least one oil supplement cavity is arranged in the plunger cavity, the oil supplement cavity is annularly arranged outside the plunger shaft body in a ring shape, and a combined sealing mechanism is further arranged between the plunger and the cylinder sleeve; the combined sealing mechanism comprises a compression ring, a sealing packing and a top cap, one end of the compression ring is used to abut against a contact wall in the cylinder sleeve, the other end of the compression ring is used to abut against the sealing packing, the other end of the sealing packing is used to abut against the top cap, the plunger penetrates through the combined sealing mechanism, the inner end surface of the sealing packing is attached to the surface of the plunger shaft body, and a filling sealing cavity is formed between the sealing packing and the contact wall; the sealing packing comprises a packing body, an expanded ring wall and a slot cavity, the slot cavity is used to abut against the compression ring, and the expanded ring wall can expand radially outward when the compression ring continuously abuts against the slot cavity; the compression ring comprises a ring seat and a compression ring part, the compression ring part is used to abut against the slot cavity, and the thickness of the compression ring part is greater than the size of the slot cavity; the expanded ring wall comprises an outer ring expanded ring wall and an inner ring expanded ring wall, the outer ring expanded ring wall is used to abut against the inner wall of the cylinder sleeve, and the inner ring expanded ring wall is used to abut against the plunger shaft body.

2. The micro flow high pressure hydraulic diaphragm metering pump according to claim 1, characterized in that: The filling sealing cavity is filled with a gelatinous sealing medium, the number of the oil supplement cavities is 2-5, and the oil supplement cavities are arranged at equal intervals.

3. The micro flow high pressure hydraulic diaphragm metering pump according to claim 2, characterized in that: A plunger through hole is arranged in the middle of the sealing packing, the plunger through hole adjacent to the end of the top cap is a large hole end, and the plunger through hole adjacent to the end of the compression ring is a small hole end.

4. The micro flow high pressure hydraulic diaphragm metering pump according to claim 3, characterized in that: The sealing packing is made of a tetrafluoro material.

5. The micro flow high pressure hydraulic diaphragm metering pump according to any one of claims 1 to 4, characterized in that: The diaphragm member is installed between the pump head and the pump body through the cooperation of a first lining plate and a second lining plate, the first lining plate is located at the pump head, the second lining plate is located at the pump body, a plurality of medium channels are arranged in the first lining plate, and a plurality of hydraulic flow channels are arranged in the second lining plate.

6. A micro flow high pressure hydraulic diaphragm metering pump according to claim 5, characterized in that: A hydraulic oil cavity is formed between the second lining plate and the plunger assembly, a diaphragm oil cavity is formed between the second lining plate and the diaphragm member, the diaphragm oil cavity and the hydraulic oil cavity are connected through the hydraulic flow channels, and the volume of the hydraulic oil cavity changes with the reciprocating movement of the plunger.

7. A micro flow high pressure hydraulic diaphragm metering pump according to claim 6, characterized in that: A hydraulic flow channel groove is arranged on the second lining plate, a plurality of hydraulic flow channels are arranged in the hydraulic flow channel groove, the hydraulic flow channel groove is located on the side wall of the second lining plate adjacent to the plunger assembly, a pressure relief flow channel and a pressure supplement flow channel are arranged in the pump body body, the hydraulic flow channel groove is connected with a pressure relief valve through the pressure relief flow channel, and the hydraulic flow channel groove is connected with an oil supplement valve through the pressure supplement flow channel.

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