Liquid transmission structure of hydraulic metering pump and hydraulic metering pump

Abstract

The utility model relates to the field of hydraulic fluid transmission, in particular to a liquid transmission structure of a hydraulic metering pump and the hydraulic metering pump. The liquid transmission structure comprises an inner support, a liquid delivery pipe and a liquid delivery pipe, the deformation sleeve is arranged outside the inner support in a sleeving mode, and a closed deformation cavity is formed between the deformation sleeve and the inner support; and the joint is communicated with the deformation cavity to form a one-way communicated liquid transmission channel. The problems that an existing diaphragm pump is small in diaphragm deformation and short in service life are solved. Through the design that the inner support is matched with the deformation sleeve, the durability and adaptability of the liquid conveying structure are improved, the overall stability is enhanced, the service life is prolonged, and the maintenance frequency is reduced. And the deformation sleeve provides a larger deformation space, so that the cost is reduced while the requirement of larger power is met. The cooperation of the two breaks through the limitation of the traditional diaphragm pump. The requirements for high structural strength and large deformation amount are met, and meanwhile the overall stress and deformation mode of the deformable body is changed.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic fluid transmission, and more specifically, to a liquid transmission structure of a hydraulic metering pump and a hydraulic metering pump. Background Art

[0002] A metering pump, also known as a quantitative pump or a proportional pump, is a positive displacement reciprocating pump used to transport liquids, which can adjust the flow rate both dynamically and statically. The metering pump adjusts the flow rate by changing the pump stroke and pump speed. The flow rate can be adjusted steplessly within the range of 0 to 100%, and the discharge flow rate is not affected by the discharge pressure. The use of a metering pump can simultaneously achieve the functions of conveying, metering and regulation, simplifying the production process. Since metering pumps can meet the needs of various strict process flows, they have been widely used in various industrial fields such as petrochemicals, pharmaceuticals, and food.

[0003] From the fluid end classification, metering pumps can be divided into diaphragm metering pumps and plunger metering pumps. The plunger metering pump has high strength and is suitable for conveying high-temperature, high-pressure, and high-viscosity media. It can reach a large outlet pressure, and the flow rate remains almost unchanged when the outlet pressure changes. However, due to the structural disadvantage that the medium and the hydraulic oil cannot be completely isolated, it is easy to cause leakage. The plunger metering pump does not meet the high anti-pollution requirements and cannot convey highly corrosive, highly volatile, flammable and explosive media. The diaphragm metering pump has no dynamic seal and is not easy to leak. It can convey highly corrosive, highly volatile, flammable and explosive media. However, the traditional sheet diaphragm metering pump has the following defects: the sheet diaphragm metering pump squeezes the diaphragm through the hydraulic oil and deforms it to change the volume, thereby completing the liquid delivery. The traditional sheet diaphragm metering pump has a small deformation, a small volume change, a low liquid delivery efficiency, and a relatively small outlet pressure. Higher pressure will cause a decrease in flow; it is difficult for the diaphragm to achieve a balance between high strength and easy deformation, and long-term stress will cause plastic deformation or rupture, and its durability is relatively poor. Utility Model Content

[0004] The utility model aims to overcome at least one defect (deficiency) of the above-mentioned prior art and provides a liquid transmission structure of a hydraulic metering pump and a hydraulic metering pump, which are used to solve the problems of small diaphragm deformation and short life of the existing diaphragm pump.

[0005] The technical solution adopted by the utility model is a liquid transmission structure of a hydraulic metering pump, comprising: an inner bracket, with joints at both ends of the inner bracket; a deformation sleeve, which is arranged outside the inner bracket to form a closed deformation cavity between the deformation sleeve and the inner bracket; the joint is connected to the deformation cavity to form a unidirectional liquid transmission channel.

[0006] The deformation sleeve is an elastic hose; the inner bracket includes an annular body, and the annular body supports the deformation sleeve to form a deformation cavity.

[0007] The liquid transmission structure also includes a hard shell, and the two ends of the hard shell are respectively connected to the two joints; a receiving cavity is provided in the hard shell, and the inner bracket and the deformable sleeve are arranged in the receiving cavity; the hard shell is provided with a plurality of liquid guide holes connecting the receiving cavity and the outside of the hard shell.

[0008] A movable baffle is provided between the hard shell and the deformable sleeve; the baffle matches the liquid guide hole.

[0009] The hard shell includes: a left shell, a right shell, and locking rings respectively connected to the two ends of the left shell and the right shell, and the left shell is connected to the right shell to form a accommodating cavity; a sealing ring is also provided between the hard shell and the deformable sleeve, and the hard shell is connected to the deformable sleeve through the sealing ring.

[0010] Furthermore, a hydraulic metering pump is provided, comprising: a pump housing, a piston, a drive assembly and a liquid transmission structure of the hydraulic metering pump; the pump housing comprises: a fluid chamber, a hydraulic chamber, and a piston channel connecting the fluid chamber and the hydraulic chamber; the liquid transmission structure is arranged in the fluid chamber; the piston is movably arranged in the piston channel; the drive assembly is arranged in the hydraulic chamber and is connected to the piston.

[0011] The piston includes: a liquid-conducting portion arranged in the piston channel, a pushing portion movably arranged in the piston channel, and an extrusion portion arranged between the liquid-conducting portion and the pushing portion; the extrusion portion is movably connected to the liquid-conducting portion, and the pushing portion is movably connected to the extrusion portion; the pushing portion is connected to the driving assembly; a liquid-conducting channel connecting the fluid chamber and the piston channel is provided on the liquid-conducting portion, and a closing surface for closing the liquid-conducting channel is provided on a side of the extrusion portion close to the liquid-conducting portion; the pushing portion is provided with a flow channel, the pushing portion cooperates with the extrusion portion, and the pushing portion closes the flow channel; the pushing portion is separated from the extrusion portion, and the flow channel connects the piston channel and the hydraulic chamber.

[0012] The piston further comprises an adjusting member and a resetting member, wherein the adjusting member is used to adjust the maximum distance between the liquid guiding portion and the extruding portion; and the resetting member is used to accelerate the separation of the liquid guiding portion and the extruding portion.

[0013] The hydraulic metering pump further comprises a regulating liquid pipe and a control valve, wherein the regulating liquid pipe forms a one-way communication between the hydraulic chamber and the fluid chamber through the control valve.

[0014] The fluid chamber is provided with an exhaust device which is communicated with the hydraulic chamber.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the durability and adaptability of the liquid transmission structure are improved through the design of the inner bracket and the deformation sleeve, the overall stability is enhanced, the service life is extended, and the maintenance frequency is reduced. The deformation sleeve provides a larger deformation space to meet the greater power demand while reducing the cost. The cooperation between the two breaks through the limitations of the traditional diaphragm pump. While taking into account the requirements of high structural strength and large deformation, the overall force and deformation mode of the deformable body are changed, thereby changing the liquid transmission, making the stress distribution more uniform and reasonable, which is conducive to improving the working efficiency of the hydraulic metering pump. Further, the design of the deformation sleeve helps to limit the liquid to be transmitted in the deformation sleeve. Compared with the existing diaphragm pump, the liquid to be transmitted will directly contact the inner wall of the fluid chamber, resulting in the need for the entire fluid chamber to adopt corrosion-resistant design when conveying corrosive liquid. This solution only requires the inner bracket and the joint to adopt corrosion-resistant design, which can greatly reduce the cost. Moreover, the liquid chamber in this solution is only in contact with the hydraulic fluid, such as hydraulic oil, and the hydraulic fluid is not corrosive, so the material requirements of the fluid chamber are greatly reduced. The design of the baffle can cooperate with the hard shell to form a liquid isolation between the hydraulic fluid and the deformation sleeve, thereby achieving comprehensive protection for the deformation sleeve. In the existing design, it is difficult to achieve complete isolation with the one-way valve at the output port of the liquid transmission structure. Especially after long-term use, when the one-way valve is aged, the output port cannot completely isolate the liquid to be transmitted, which will cause liquid reflux. When the deformation sleeve is in the process of negative pressure expansion, the incomplete discharge of the last required transmission liquid will cause the pressure of the deformation sleeve to increase sharply, which is very likely to cause damage to the deformation sleeve. The baffle solves this problem by isolating the liquid, thereby forming a good protection for the deformation sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the inner support in the present invention.

[0017] Figure 2 This is a front view of the liquid transmission structure of the present invention before the hard shell is installed.

[0018] Figure 3 This is a side view of the liquid transmission structure of the present invention before the hard shell is installed.

[0019] Figure 4 It is a horizontal cross-sectional view of the middle part of the liquid transmission structure in the present invention.

[0020] Figure 5 This is a schematic diagram of the process of installing a hard shell of the liquid transmission structure in the present invention.

[0021] Figure 6 It is a schematic diagram of the decomposition of the liquid transmission structure in the present invention.

[0022] Figure 7 It is a schematic diagram of the hydraulic metering pump in the present invention.

[0023] Figure 8 It is a schematic diagram of the improved piston in the present invention.

[0024] Fig. 9 It is a schematic diagram of the liquid guiding part in the present invention.

[0025] Fig.10 It is a schematic diagram of the hydraulic metering pump of the present invention using an improved piston.

[0026] Explanation of the reference numerals: liquid transmission structure 001, inner bracket 100, annular main body 101, joint 110, deformation sleeve 200, deformation chamber 210, hard shell 300, left shell 301, right shell 302, locking ring 303, accommodating chamber 310, liquid guiding hole 320, sealing ring 340, pump shell 002, fluid accommodating chamber 410, hydraulic accommodating chamber 420, piston channel 430, piston 003, extrusion part 510, closing surface 511, liquid guiding part 520, liquid guiding channel 521, reset part 530, adjusting part 540, pushing part 550, flow channel 551, drive assembly 004, regulating liquid pipe 602, control valve 603, exhaust device 604. DETAILED DESCRIPTION

[0027] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0028] Example 1

[0029] like Figure 2 and Figure 3 As shown, this embodiment is a liquid transmission structure 001 of a hydraulic metering pump, comprising: an inner bracket 100, with joints 110 at both ends of the inner bracket 100; a deformation sleeve 200, which is sleeved outside the inner bracket 100, as shown in FIG. Figure 4 As shown, a closed deformation cavity 210 is formed between the deformation sleeve 200 and the inner bracket 100; the joint 110 is connected to the deformation cavity 210 to form a unidirectional liquid transmission channel.

[0030] The inner support 100 is used to support the deformable sleeve 200 from the inside of the deformable sleeve 200 to form a plurality of deformable surfaces. The deformable sleeve 200 is used to generate pressure changes in the deformable sleeve 200 by using its own contraction and expansion. The deformable cavity 210 is used to absorb and release the transmission liquid. When the deformable cavity 210 is deformed, pressure is generated in the liquid transmission channel to promote the transmission of the liquid. The joint 110 is used for the input and output of the liquid. The unidirectionally conductive liquid transmission channel ensures that the liquid will not flow back, so as to realize the transmission of the liquid in a fixed direction.

[0031] The inner bracket 100 supports and fixes the deformation sleeve 200. Compared with the diaphragm deformation in the existing diaphragm metering pump, the design of the deformation sleeve 200 has the advantages of larger deformation and higher efficiency. At the same time, the deformation sleeve 200 is more uniform when subjected to force, so that its life is longer. It not only improves durability, but also enhances overall stability and reduces the frequency of replacement. Compared with the deformation membrane, the manufacturing cost of the deformation tube is low, and the difficulty of installation and fixing becomes smaller, but it can adapt to the precise transmission of small flow rates. On the other hand, the deformation sleeve 200 provides sufficient internal deformation space. Under the action of the inner bracket 100, it breaks through the limitation that the traditional diaphragm deformation area cannot form an effective support. While taking into account the requirements of high structural strength and large deformation, the inner bracket 100 is used to optimize the overall force surface to achieve efficient and stable liquid transmission.

[0032] By applying pressure to the deformation chamber 210, the deformation chamber 210 is compressed and shrunk. The two ends of the deformation sleeve 200 are connected to the joint 110. During the shrinkage process, the connection between the deformation sleeve 200 and the joint 110 is pulled, which can easily lead to a poor sealing effect. Under the action of the inner bracket 100, the shrinkage of the deformation chamber 210 is supported by the inner bracket 100, and the direction of deformation is guided under the action of the inner bracket 100, which improves the sealing performance while protecting the deformation sleeve 200. Since the liquid transmission channel is unidirectional, the gas or liquid in the deformation chamber 210 passes through the output end of the deformation sleeve 200, enters the corresponding joint 110 and is discharged. The deformation chamber 210 expands under the action of negative pressure, and the entrance end of the deformation chamber 210 generates negative pressure, which sucks the external gas or liquid into the liquid transmission channel. The transmission of liquid is achieved by repeated deformation of the deformation chamber 210. The one-way conduction of the liquid transmission channel can be specifically achieved through the one-way conduction of the connector 110, such as by setting a one-way valve on the connector 110. When both connectors 110 are provided with one-way valves, the conduction directions of the two connectors 110 are consistent. The one-way valve is designed by utilizing the space in the connector 110 to make the space in the deformation chamber 210 larger, thereby optimizing the structure, transmitting the force and accommodating space, and reducing the volume of the liquid transmission structure 001. The deformation sleeve 200 can be made of rubber material or Teflon material.

[0033] like Figure 1As shown, the deformation sleeve 200 is an elastic hose; the inner bracket 100 includes an annular body 101, and the annular body 101 expands the deformation sleeve 200 to form a deformation cavity 210.

[0034] The annular body 101 is used to form an annular support in the deformation sleeve 200. The joints 110 can be respectively arranged at two positions farthest from each other on the annular body 101.

[0035] The deformation sleeve 200 can rapidly and repeatedly expand and contract by utilizing its own elastic deformation, and can rapidly recover after deformation by utilizing its own elasticity, thereby improving efficiency. The tubular design of the deformation sleeve 200 not only reduces the difficulty of production and simplifies the difficulty of installation and fixation, but also enables the deformation sleeve 200 to be evenly stressed and structurally stable. Compared with the deformation membrane, it is simpler to fix, more durable, less prone to rupture, and has a low cost, and can adapt to a larger deformation amount. The tubular design also enables the liquid transmission structure 001 to adapt to liquids with large particle sizes and has high adaptability to the viscosity of the liquid.

[0036] In this embodiment, the width of the elongated annular body 101 is greater than the width of the elastic hose, and the length of the annular body 101 is less than the length of the elastic hose. The elastic hose can be connected to the connector 110 by binding, clamping, snapping, gluing, and other methods.

[0037] like Figure 5 As shown, the liquid transfer structure 001 also includes a hard shell 300, and the two ends of the hard shell 300 are respectively connected to the two joints 110; a receiving cavity 310 is provided in the hard shell 300, and the inner bracket 100 and the deformable sleeve 200 are arranged in the receiving cavity 310; the hard shell 300 is provided with a plurality of liquid guide holes 320 connecting the receiving cavity 310 and the outside of the hard shell 300.

[0038] The hard shell 300 is used to protect the deformation sleeve 200 when it expands. The accommodating cavity 310 is used to limit the maximum deformation of the deformation sleeve 200. The liquid guide hole 320 is used to communicate the inside and outside of the hard shell 300, so that the hydraulic fluid can pass through the hard shell 300 to act on the deformation sleeve 200.

[0039] The hard shell 300 can not only prevent external collisions, but also protect the deformation sleeve 200, preventing the deformation sleeve 200 from being damaged or cracked due to excessive volume expansion during expansion. The hard shell 300 has good durability and high structural strength. It cooperates with the inner bracket 100 to protect the inside and outside of the deformation sleeve 200 without affecting the deformation sleeve 200. By limiting the maximum and minimum deformation of the deformation sleeve 200, the life of the deformation sleeve 200 is greatly extended, and the seal between the deformation sleeve 200 and the joint 110 is optimized.

[0040] The hard shell 300 is made of a rigid metal material, and the openings at both ends are cylindrical. The two joints 110 are clamped at the two ends of the hard shell 300, and the deformation sleeve 200 is clamped on the joints 110 to form a seal on both sides of the deformation sleeve 200. The liquid guide hole 320 is an oblong hole, and the distance between two adjacent liquid guide holes 320 is equal. The cylindrical design can better match the expansion shape of the deformation sleeve 200, and does not hinder the normal volume change of the deformation sleeve 200. When the deformation sleeve 200 expands to abut the inner side of the hard shell 300, the hard shell limits the deformation sleeve 200 from further enlarging, thereby avoiding the tearing caused by excessive expansion of the deformation sleeve 200; and the inner bracket 100 controls the shrinkage deformation direction of the deformation sleeve 200 when the deformation sleeve 200 shrinks, resists the excessive shrinkage of the deformation sleeve 200 to a certain extent, prompts the deformation sleeve 200 to quickly restore its shape after decompression, and can effectively avoid the inner wall adhesion caused by the long-term shrinkage of the deformation sleeve 200.

[0041] A movable baffle is provided between the hard shell 300 and the deformable sleeve 200 ; the baffle matches the liquid guide hole 320 .

[0042] The blocking piece is used to prevent the deformation sleeve 200 from entering into the liquid guiding hole 320 or squeezing the edge of the liquid guiding hole 320 during the expansion process.

[0043] The provision of the baffle can provide further protection for the deformation sleeve 200 and prevent the deformation sleeve 200 from being damaged by the liquid guide hole 320 .

[0044] The baffle is slightly larger than the liquid-conducting hole 320 and can completely close the liquid-conducting hole 320. The number and position of the baffle correspond to the liquid-conducting hole 320. The baffle can be attached to the deformation sleeve 200, and cooperate with the hard shell as the deformation sleeve 200 expands. It can also be connected to the inner wall of the hard shell 300 through both ends, and can be pushed from the outside by the liquid to allow the liquid to enter the inside of the hard shell 300.

[0045] like Figure 6 As shown, the hard shell 300 includes: a left shell 301, a right shell 302, and a locking ring 303 respectively connected to the two ends of the left shell 301 and the right shell 302, and the left shell 301 is connected to the right shell 302 to form a accommodating cavity 310; a sealing ring 340 is also provided between the hard shell 300 and the deformable sleeve 200, and the hard shell 300 is connected to the deformable sleeve 200 through the sealing ring 340.

[0046] The locking ring 303 is used to lock the left shell 301 and the right shell 302 from both ends. The left shell 301 and the right shell 302 are used to form a hard shell 300. The sealing ring 340 is used to further clamp the deformation sleeve 200 to form a better seal between the deformation sleeve 200 and the joint 110.

[0047] The design of the left shell 301 and the right shell 302 simplifies the installation of the hard shell 300 and optimizes the installation, fixation and sealing of the deformation sleeve 200. By further providing a sealing ring 340, the sealing ring 340 made of elastic material not only forms a fixation between the deformation sleeve 200 and the joint 110, so that the sealing effect between the deformation sleeve 200 and the joint 110 is better, but also uses its own elasticity to cooperate with the locking ring 303, thereby stabilizing the combination of the left shell 301 and the right shell 302 from the inside and outside, making its structure more stable and reliable.

[0048] The surface area between the two locking rings 303 is the side area of ​​the hard shell, and the liquid guide hole 320 accounts for 1 / 3 to 2 / 3 of the side area. The left shell 301 and the right shell 302 are symmetrically arranged. The upper and lower ends of the left shell 301 and the right shell 302 are combined to form a complete thread, which is threadedly connected with the locking ring 303. The inner walls of the left shell 301 and the right shell 302 are also provided with positioning grooves for the sealing ring 340 at both ends, which are used to place the displacement of the sealing ring 340.

[0049] Example 2

[0050] like Figure 7 As shown, this embodiment is a hydraulic metering pump, comprising: a pump housing 002, a piston 003, a drive assembly 004 and a liquid transmission structure 001 of a hydraulic metering pump; the pump housing 002 comprises: a fluid chamber 410, a hydraulic chamber 420, and a piston channel 430 connecting the fluid chamber 410 and the hydraulic chamber 420; the liquid transmission structure 001 is arranged in the fluid chamber 410; the piston 003 is movably arranged in the piston channel; the drive assembly 004 is arranged in the hydraulic chamber 420 and is connected to the piston 003.

[0051] The liquid transfer structure 001 includes: an inner bracket 100, with joints 110 at both ends of the inner bracket 100; a deformation sleeve 200, which is sleeved outside the inner bracket 100, and a closed deformation cavity 210 is formed between the deformation sleeve 200 and the inner bracket 100; the joint 110 is connected to the deformation cavity 210 to form a unidirectional liquid transfer channel.

[0052] By applying pressure to the deformation chamber 210, the deformation chamber 210 is compressed and shrunk. The two ends of the deformation sleeve 200 are connected to the joint 110. During the shrinkage process, the connection between the deformation sleeve 200 and the joint 110 is pulled, which can easily lead to a poor sealing effect. Under the action of the inner bracket 100, the shrinkage of the deformation chamber 210 is supported by the inner bracket 100, and the direction of deformation is guided under the action of the inner bracket 100, which improves the sealing performance while protecting the deformation sleeve 200. Since the liquid transmission channel is unidirectional, the gas or liquid in the deformation chamber 210 passes through the output end of the deformation sleeve 200, enters the corresponding joint 110 and is discharged. The deformation chamber 210 expands under the action of negative pressure, and the entrance end of the deformation chamber 210 generates negative pressure, which sucks the external gas or liquid into the liquid transmission channel. The transmission of liquid is achieved by repeated deformation of the deformation chamber 210. The one-way conduction of the liquid transmission channel can be specifically achieved through the one-way conduction of the connector 110, such as by setting a one-way valve on the connector 110. When both connectors 110 are provided with one-way valves, the conduction directions of the two connectors 110 are consistent. The one-way valve is designed by utilizing the space in the connector 110 to make the space in the deformation chamber 210 larger, thereby optimizing the structure, transmitting the force and accommodating space, and reducing the volume of the liquid transmission structure 001. The deformation sleeve 200 can be made of rubber material or Teflon material.

[0053] The deformation sleeve 200 is an elastic hose; the inner bracket 100 includes an annular body 101 , and the annular body 101 expands the deformation sleeve 200 to form a deformation cavity 210 .

[0054] In this embodiment, the width of the elongated annular body 101 is greater than the width of the elastic hose, and the length of the annular body 101 is less than the length of the elastic hose. The elastic hose can be connected to the connector 110 by binding, clamping, snapping, gluing, and other methods.

[0055] The liquid transmission structure 001 also includes a hard shell 300, and the two ends of the hard shell 300 are respectively connected to the two joints 110; a receiving chamber 310 is provided in the hard shell 300, and the inner bracket 100 and the deformation sleeve 200 are arranged in the receiving chamber 310; the hard shell 300 is provided with a plurality of liquid guide holes 320 connecting the receiving chamber 310 and the outside of the hard shell 300.

[0056] The hard shell 300 is made of a rigid metal material, and the openings at both ends are cylindrical. The two joints 110 are clamped at the two ends of the hard shell 300, and the deformation sleeve 200 is clamped on the joints 110 to form a seal on both sides of the deformation sleeve 200. The liquid guide hole 320 is an oblong hole, and the distance between two adjacent liquid guide holes 320 is equal. The cylindrical design can better match the expansion shape of the deformation sleeve 200, and does not hinder the normal volume change of the deformation sleeve 200. When the deformation sleeve 200 expands to abut the inner side of the hard shell 300, the hard shell limits the deformation sleeve 200 from further enlarging, thereby avoiding the tearing caused by excessive expansion of the deformation sleeve 200; and the inner bracket 100 controls the shrinkage deformation direction of the deformation sleeve 200 when the deformation sleeve 200 shrinks, resists the excessive shrinkage of the deformation sleeve 200 to a certain extent, prompts the deformation sleeve 200 to quickly restore its shape after decompression, and can effectively avoid the inner wall adhesion caused by the long-term shrinkage of the deformation sleeve 200.

[0057] A movable baffle is provided between the hard shell 300 and the deformable sleeve 200 ; the baffle matches the liquid guide hole 320 .

[0058] The baffle is slightly larger than the liquid-conducting hole 320 and can completely close the liquid-conducting hole 320. The number and position of the baffle correspond to the liquid-conducting hole 320. The baffle can be attached to the deformation sleeve 200, and cooperate with the hard shell as the deformation sleeve 200 expands. It can also be connected to the inner wall of the hard shell 300 through both ends, and can be pushed from the outside by the liquid to allow the liquid to enter the inside of the hard shell 300.

[0059] The hard shell 300 includes: a left shell 301, a right shell 302, and a locking ring 303 respectively connected to the two ends of the left shell 301 and the right shell 302. The left shell 301 and the right shell 302 are connected to form a accommodating cavity 310. A sealing ring 340 is also provided between the hard shell 300 and the deformable sleeve 200, and the hard shell 300 is connected to the deformable sleeve 200 through the sealing ring 340.

[0060] The surface area between the two locking rings 303 is the side area of ​​the hard shell, and the liquid guide hole 320 accounts for 1 / 3 to 2 / 3 of the side area. The left shell 301 and the right shell 302 are symmetrically arranged. The upper and lower ends of the left shell 301 and the right shell 302 are combined to form a complete thread, which is threadedly connected with the locking ring 303. The inner walls of the left shell 301 and the right shell 302 are also provided with positioning grooves for the sealing ring 340 at both ends, which are used to place the displacement of the sealing ring 340.

[0061] The hydraulic chamber 420 is used to provide pressurized liquid, which acts on the fluid chamber 410 under the action of the driving assembly 004 to change the pressure in the fluid chamber 410. The piston 003 is used to push the liquid in the hydraulic chamber 420 into the fluid chamber 410. The driving assembly 004 is used to drive the piston 003 to move back and forth. The piston 430 is used for the movement of the piston 003 and the liquid.

[0062] The liquid transmission structure 001 can adapt to the use of hydraulic environment. Under the action of hydraulic pressure, the force self-uniformity under pressure is better, the service life is long, and the deformation is large, so that the flow rate and particle size of the hydraulic metering pump are highly adaptable. It is beneficial to extend the service life of the hydraulic metering pump and reduce the replacement frequency of the deformation structure as a wearing part.

[0063] The driving component 004 is a crankshaft connecting rod mechanism. An observation window is provided on the fluid chamber 410, through which the internal conditions of the fluid chamber 410 can be observed, and when the liquid piston 003 structure leaks or the fluid chamber 410 ruptures, the liquid stratification or the drop in the liquid level can be observed, so that the inspectors can quickly find the problem. When in use, the hydraulic chamber 420 and the fluid chamber 410 are filled with hydraulic oil. The crankshaft connecting rod is driven by an external motor to form a reciprocating motion of the piston 003. When in conjunction with an external liquid supply system, the inlet regulating liquid pipe 602 in the external supply regulating liquid pipe 602 is connected to the liquid inlet, and the outlet regulating liquid pipe 602 is connected to the liquid outlet. Preferably, two or more liquid transmission structures 001 can be set in the fluid chamber 410, so as to meet the multi-way liquid supply at the same time.

[0064] like Figure 8 As shown, the piston 003 includes: a liquid guiding portion 520 arranged in the piston 430, a pushing portion 550 movably arranged in the piston channel 430, and an extrusion portion 510 arranged between the liquid guiding portion 520 and the pushing portion 550; the extrusion portion 510 is movably connected to the liquid guiding portion 520, and the pushing portion 550 is movably connected to the extrusion portion 510; the pushing portion 550 is connected to the driving component 004; a liquid guiding channel connecting the fluid chamber 410 and the piston channel 430 is provided on the liquid guiding portion 520, a closing surface 511 for closing the liquid guiding channel is provided on the side of the extrusion portion 510 close to the liquid guiding portion 520, the pushing portion 550 is provided with a flow channel 551, the pushing portion 550 cooperates with the extrusion portion 510, and the pushing portion 550 closes the flow channel 551; the pushing portion 550 is separated from the extrusion portion 510, and the flow channel 551 connects the piston channel 430 and the hydraulic chamber 420.

[0065] The liquid guiding portion 520 is used to guide the liquid. The extrusion portion 510 is used to cooperate with the liquid guiding portion 520 to push the liquid. The liquid guiding channel is used to connect the piston channel 430 and the fluid receiving chamber 410.

[0066] The design of the extrusion part 510 and the liquid guide part 520 changes the traditional piston 003 entering and exiting the piston channel, and realizes the entry and exit of the piston channel liquid. Through the liquid guide channel on the extrusion part 510, the way of liquid entering the piston 430 is changed, and the problem of the abrasion of the edge of the piston 003 caused by the high-pressure liquid when the existing piston 003 closes the piston channel, resulting in a decrease in the life of the piston 003, and the reduction of the sealing effect after abrasion, resulting in a drop in pressure. By combining and separating the extrusion part 510 and the liquid guide part 520 in the piston 430, the piston 003 is protected and the overall life is increased.

[0067] like Fig.10 As shown, the driving assembly 004 drives the push part 550 to make a reciprocating motion, and the pressure liquid enters between the liquid guiding part 520 and the extrusion part 510 through the flow channel 551; when the push part 550 moves toward the fluid chamber 410, the push part 550 cooperates with the extrusion part 510 to close the flow channel 551, and then pushes the extrusion part 510 to move toward the liquid guiding part 520, and presses the pressure liquid between the liquid guiding part 520 and the extrusion part 510 into the fluid chamber 410 until the closing surface 511 abuts against the liquid guiding part 520, and all the liquid guiding channels 521 are closed. The extrusion part 520 is used to conduct the liquid used for hydraulic pressure. The push part 510 is used to cooperate with the extrusion part 520 to push the liquid. The liquid guiding channel 521 is used to connect the power chamber 420 and the hydraulic chamber 410. When the two abut, the liquid guiding channel is blocked by the closing surface 511 perpendicular to the channel and then cut off, and no high-pressure abrasive flow beam is generated. When the driving assembly 004 returns, the extrusion part 510 is pulled to quickly separate from the liquid guiding part 520, and the liquid pressure is quickly released to reduce consumption. In this embodiment, the cross section of the extrusion part 510 is smaller than the liquid guiding part 520. The liquid guiding part 520 is provided with a plurality of evenly distributed liquid guiding channels arranged around the center of the cross section, and the cross section of the liquid guiding channel is circular and runs through both sides of the liquid guiding part 520. The plurality of liquid guiding channels are used between the hydraulic chamber 420 and the fluid chamber 410 to realize the transmission of liquid.

[0068] like Fig. 9 As shown, the piston 003 further includes an adjusting member 540 and a resetting member 530 , wherein the adjusting member 540 is used to adjust the maximum distance between the liquid guiding portion 520 and the extruding portion 510 ; and the resetting member 530 is used to accelerate the separation of the liquid guiding portion 520 and the extruding portion 510 .

[0069] The setting of the adjusting member 540 enables the piston 003 to flexibly adjust the effective driving range of the driving assembly 004, thereby adjusting the transmission pressure of the hydraulic metering pump so that it can adapt to liquids of different viscosities. The reset member 530 has a buffering effect on the movement of the extrusion part 510 to the liquid guide part 520 to avoid violent collision, and can cooperate with the adjusting member 540 to control the power action range of the driving assembly 004.

[0070] The power action range specifically refers to the angle range in which the crankshaft produces a pushing effect on the piston 003 during the reciprocating process. The adjusting member 540 can specifically be a bolt. A through hole is provided in the middle of the liquid guiding part 520. The bolt passes through the through hole and forms a threaded connection with the middle of the pushing member. By adjusting the bolt, the maximum distance between the liquid guiding part 520 and the extruding part 510 can be controlled. The reset member 530 can specifically be a spring. The spring is sleeved on the adjusting member 540 and is arranged between the liquid guiding part 520 and the extruding part 510.

[0071] The hydraulic metering pump further includes a regulating liquid pipe 602 and a control valve 603 . The regulating liquid pipe 602 forms a one-way communication with the hydraulic chamber 420 and the fluid chamber 410 through the control valve 603 .

[0072] The control valve 603 forms a protection when the pressure in the fluid chamber 410 is too high, and adjusts the pressure in the fluid chamber 410 by connecting the hydraulic chamber 420, thereby protecting the liquid transmission structure 001.

[0073] The control valve 603 forms a one-way conduction from the hydraulic chamber 420 to the fluid chamber 410. When the negative pressure generated in the fluid chamber 410 is too large and exceeds the preset pressure value of the control valve 603, the control valve 603 is opened, the hydraulic chamber 420 is connected to the fluid chamber 410, and the negative pressure forms the suction force of the regulating liquid pipe 602, sucking the pressure liquid in the hydraulic chamber 420 into the fluid chamber 410, thereby reducing the excessive pressure in the fluid chamber 410. After the normal pressure is restored, the control valve 603 is closed again. As a preference, another control valve 603 with the opposite conduction direction can be further provided to achieve protection when the positive pressure in the control valve 603 is too large.

[0074] The fluid chamber 410 is provided with an exhaust device 604 which is in communication with the hydraulic chamber 420 .

[0075] In this embodiment, the exhaust device 604 also includes a locking cap, which is used to close the exhaust device 604. The exhaust device 604 can effectively exhaust the residual gas in the fluid cavity when the hydraulic metering pump is used for the first time to fill oil, especially the tiny bubbles attached to the surface of the liquid transmission structure 001, to prevent the pressure drop caused by the residual liquid.

[0076] The exhaust device 604 can specifically be an exhaust valve with a cover. The exhaust device 604 can specifically be connected to the top of the fluid chamber 410 and be located above the liquid transfer structure 001. After the gas is exhausted, the exhaust device 604 can be closed by the locking cap to avoid leakage of the pressurized liquid during subsequent use. If air is mixed into the hydraulic metering pump during operation, the compressibility of the air is higher than that of the pressurized liquid. When the fluid chamber 410 is pressurized, the compression of the gas will cause the overall pressure to decrease. Setting an exhaust valve can avoid the influence of air on the flow rate of the hydraulic metering pump. In addition, setting an exhaust valve can avoid the cavitation effect from shortening the service life of the components.

[0077] The design of the inner bracket 100 and the deformation sleeve 200 improves the durability and adaptability of the liquid transmission structure 001, enhances the overall stability, prolongs the service life, and reduces the maintenance frequency. The deformation sleeve 200 provides a larger deformation space to meet greater power requirements while reducing costs. The combination of the two breaks through the limitations of traditional diaphragm pumps. While taking into account the requirements of high structural strength and large deformation, the overall force and deformation mode of the deformable body are changed, thereby changing the liquid transmission, making the stress distribution more uniform and reasonable, which is conducive to improving the working efficiency of the hydraulic metering pump.

[0078] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. A liquid transmission structure of a hydraulic metering pump, characterized in that: include: An inner bracket, wherein two ends of the inner bracket are provided with joints; A deformation sleeve, wherein the deformation sleeve is arranged outside the inner support, and a closed deformation cavity is formed between the deformation sleeve and the inner support; The joint is connected to the deformation cavity to form a unidirectional liquid transmission channel.

2. The liquid transmission structure of a hydraulic metering pump according to claim 1, characterized in that: The deformation sleeve is an elastic hose; the inner bracket includes an annular body, and the annular body supports the deformation sleeve to form a deformation cavity.

3. A liquid transmission structure of a hydraulic metering pump according to any one of claims 1 to 2, characterized in that: It also includes a hard shell, the two ends of which are respectively connected to the two joints; a receiving cavity is provided in the hard shell, and the inner bracket and the deformable sleeve are arranged in the receiving cavity; and a plurality of liquid guide holes connecting the receiving cavity and the outside of the hard shell are provided on the hard shell.

4. The liquid transmission structure of a hydraulic metering pump according to claim 3, characterized in that: A movable baffle is provided between the hard shell and the deformable sleeve; the baffle matches the liquid guide hole.

5. The liquid transmission structure of a hydraulic metering pump according to claim 3, characterized in that: The hard shell includes: a left shell, a right shell, and locking rings connected to both ends of the left shell and the right shell respectively, and the left shell and the right shell are connected to form a receiving cavity; A sealing ring is also provided between the hard shell and the deformation sleeve, and the hard shell is connected to the deformation sleeve through the sealing ring.

6. A hydraulic metering pump, characterized in that: include: A pump housing, a piston, a drive assembly and a liquid transmission structure of a hydraulic metering pump as claimed in any one of claims 1 to 5; The pump housing comprises: a fluid chamber, a hydraulic chamber, and a piston passage connecting the fluid chamber and the hydraulic chamber; the liquid transmission structure is arranged in the fluid chamber; The piston is movably arranged in the piston channel; The driving assembly is arranged in the hydraulic chamber and is connected to the piston.

7. A hydraulic metering pump according to claim 6, characterized in that: The piston comprises: A liquid guiding portion disposed in the piston channel, a pushing portion movably disposed in the piston channel, and a squeezing portion disposed between the liquid guiding portion and the pushing portion; The extrusion part is movably connected to the liquid guiding part, and the pushing part is movably connected to the extrusion part; the pushing part is connected to the driving assembly; The liquid-conducting portion is provided with a liquid-conducting channel connecting the fluid-containing cavity and the piston channel, and the side of the extruding portion close to the liquid-conducting portion is provided with a closing surface for closing the liquid-conducting channel; The pushing part is provided with a flow channel, the pushing part cooperates with the extrusion part, and the pushing part closes the flow channel; the pushing part is separated from the extrusion part, and the flow channel connects the piston channel and the hydraulic chamber.

8. A hydraulic metering pump according to claim 7, characterized in that: The piston further comprises an adjusting member and a resetting member, wherein the adjusting member is used to adjust the maximum distance between the liquid guiding portion and the extruding portion; The resetting member is used to accelerate the separation of the liquid guiding portion and the extruding portion.

9. A hydraulic metering pump according to any one of claims 6 to 8, characterized in that: It also includes a regulating liquid pipe and a control valve, wherein the regulating liquid pipe forms a one-way conduction between the hydraulic chamber and the fluid chamber through the control valve.

10. A hydraulic metering pump according to any one of claims 6 to 8, characterized in that: The fluid chamber is provided with an exhaust device which is communicated with the hydraulic chamber.

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