Double-acting hydraulic four-fluorine diaphragm pump

Abstract

The application relates to the technical field of diaphragm pumps and discloses a double-acting hydraulic four-fluorine diaphragm pump which comprises a pump body, a piston and two delivery units, the pump body is internally provided with a piston rod channel and a piston cylinder for reciprocating movement of the piston, the two delivery units are symmetrically arranged along the piston cylinder axis, the two delivery units share one pump body, each delivery unit comprises a pump cover, a double-layer diaphragm is arranged between the pump cover and the pump body, the double-layer diaphragm forms a diaphragm chamber and a hydraulic chamber with the pump cover and the pump body, pressure taking devices for pressure alarm are arranged at the two ends of the double-layer diaphragm, the pump body is internally provided with an oil channel which is in communication with the piston cylinder, the pump body is provided with a mounting hole for mounting a limiting valve, and the limiting valve is located between the hydraulic chamber and the oil channel; the oil channel inlets of the two delivery units are respectively located above the left side and below the right side of the piston cylinder, and the piston seat of the piston reciprocates between the two inlets. In actual use, the double-acting hydraulic four-fluorine diaphragm pump has compact structure, and the volume and weight are only slightly increased compared with those of a single-acting hydraulic four-fluorine diaphragm pump, but the delivery flow of the pump is about twice that of the single-acting hydraulic four-fluorine diaphragm pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diaphragm pumps, in particular to a double-acting hydraulic tetrafluoro diaphragm pump. BACKGROUND

[0002] Diaphragm pumps have a wide range of applications, and are used in industries such as oil exploration, petrochemical industry, coal chemical industry, non-ferrous metallurgy, and power industry. They can be used to transport high-temperature, high-pressure, high-concentration, high-density, large-particle, easily precipitated, highly abrasive, highly corrosive, flammable, and explosive media. Diaphragm pumps have mechanical transmission, hydraulic transmission, and pneumatic transmission. Mechanical transmission is driven by a motor and requires electric control, which is not suitable for use in flammable and explosive environments and cannot be completely immersed in operation. Pneumatic transmission has limited pressure and cannot meet the pressure requirements of high-pressure applications. Therefore, the market share of hydraulic diaphragm pumps is gradually increasing, and the requirements for hydraulic diaphragm pumps in many special operating environments are also higher.

[0003] Currently, hydraulic tetrafluoro diaphragm pumps are widely used in offshore operations and ship operations due to their performance and reliability. However, the output flow of a single hydraulic tetrafluoro diaphragm pump cannot meet the requirements of special operating spaces in terms of weight and volume. To meet the output flow requirements of offshore operations and ship operations, multiple pumps can be connected in series or larger diaphragm pumps can be used. However, the operating space on offshore platforms and ships is limited, and there are strict requirements for the size and weight of various equipment. Although multiple pumps connected in series or larger diaphragm pumps can achieve higher flow output, the overall size and weight of the diaphragm pump will also increase, which cannot meet the requirements for normal installation of equipment. Therefore, there is an urgent need to design a hydraulic tetrafluoro diaphragm pump with small size and high output flow. SUMMARY

[0004] The present application aims to provide a double-acting hydraulic tetrafluoro diaphragm pump to solve the problem of large size and small output flow of existing hydraulic tetrafluoro diaphragm pumps, which cannot meet the requirements of special operating environments.

[0005] To achieve the above object, the application adopts the following technical scheme: the double-acting hydraulic four-fluorine diaphragm pump comprises a pump body, a piston and two delivery units, the pump body is provided with a piston rod channel and a piston cylinder for reciprocating movement of the piston, the two delivery units are symmetrically arranged along the axis of the piston cylinder, the two delivery units share one pump body, each delivery unit comprises a pump cover, a double-layer diaphragm is arranged between the pump cover and the pump body, the double-layer diaphragm forms a diaphragm chamber and a hydraulic chamber with the pump cover and the pump body respectively, pressure taking devices for pressure alarm are arranged at both ends of the double-layer diaphragm, the pump body is provided with an oil channel connected with the piston cylinder, the pump body is provided with a mounting hole for mounting a limiting valve, and the limiting valve is located between the hydraulic chamber and the oil channel; the oil channel inlets of the two delivery units are located above the left side and below the right side of the piston cylinder respectively, and the piston seat of the piston reciprocates between the two inlets.

[0006] The beneficial effects are:

[0007] 1. In actual application, two diaphragm chambers are symmetrically arranged on one pump body to form two delivery units, a shared piston is arranged at the middle position of the two diaphragm chambers, the piston movement makes both diaphragm chambers work, that is, the piston works in both directions, the working efficiency of the piston is increased, the output flow of the pump is doubled without increasing the complexity of the equipment structure, the implementation cost is low, and the economic benefit is high.

[0008] 2. In actual application, the oil channels of the two delivery units are located above the left side and below the right side of the piston cylinder respectively, the piston seat of the piston reciprocates between the inlets of the two delivery units, the oil channel path is different in axis from the movement path of the piston seat, the above-mentioned arrangement only slightly increases the volume and weight of the diaphragm pump, but the output flow of the pump is doubled, which can better meet the needs of users with limited installation size and weight requirements, and the application environment is more extensive.

[0009] Preferably, as an improvement, the oil channels of the two delivery units are arranged above the left side and below the right side of the piston cylinder respectively, the oil channel is in the shape of inverted "L" and comprises an oil channel segment perpendicular to the axis of the piston cylinder and an oil channel segment parallel to the axis of the piston cylinder.

[0010] Through the above-mentioned arrangement, on the one hand, the two delivery units are located at the middle position of the entire pump body to ensure the installation stability of the diaphragm pump; on the other hand, the path of the above-mentioned oil channel is arranged to reduce the space occupied by the oil channel under the premise of ensuring the sufficiency of the oil channel path, thereby reducing the volume of the pump body, making the overall volume of the diaphragm pump small, and also ensuring the oil pressure change range of the hydraulic oil in a single delivery unit, ensuring sufficient discharge pressure, and the delivery flow of a single delivery unit is approximately equal to that of the existing single-acting hydraulic four-fluorine diaphragm pump.

[0011] Preferably, as an improvement, the pressure taking device is a T-shaped metal pressure taking ring, and an L-shaped hole is formed in the T-shaped metal pressure taking ring, and one end of the L-shaped hole is communicated with the pressure taking hole in the pump cover.

[0012] When the diaphragm is broken, hydraulic oil or fluid enters between the double-layer diaphragm, enters the pressure taking hole from the L-shaped hole of the T-shaped metal pressure taking ring, the gas in the pressure taking hole is compressed, the pressure rises, and the pressure alarm device is triggered.

[0013] Preferably, as an improvement, the pressure taking device is a flexible mesh cloth pressure taking piece, the flexible mesh cloth pressure taking piece is a circular ring, the outer peripheral edge is in contact with the pressure taking hole, the mesh number of the flexible mesh cloth pressure taking piece is 40-60 meshes, and the thickness of the flexible mesh cloth pressure taking piece is less than the thickness of any diaphragm of the double-layer diaphragm.

[0014] The double-layer diaphragm is adopted, when any diaphragm of the double-layer diaphragm is broken, hydraulic oil or fluid enters between the double-layer diaphragm, enters the pressure taking hole through the mesh, the pressure in the pressure taking hole rises, the pressure alarm device senses the pressure change and realizes diaphragm breakage alarm, compared with the metal pressure taking ring, the flexible mesh cloth pressure taking piece is a flexible material, which greatly reduces the wear of the diaphragm and prolongs the service life of the diaphragm; the mesh number is set to 40-60 meshes to ensure the accuracy of pressure taking; the thickness of the flexible mesh cloth pressure taking piece is less than the thickness of any diaphragm of the double-layer diaphragm, which can better ensure the smooth transition of the diaphragm and improve the edge adhesion of the oil diaphragm and the material diaphragm.

[0015] Preferably, as an improvement, the limiting valve is connected with the oil supplementing device.

[0016] The above setting can supplement the hydraulic oil in the piston cylinder and the hydraulic chamber in time, ensure that the oil pressure in the pump body is sufficient, and then ensure the overall conveying efficiency of the pump.

[0017] Preferably, as an improvement, a multi-stage sealing structure is installed between the piston rod and the pump body.

[0018] Unlike the hydraulic oil flow path of the existing single-acting hydraulic four-fluorine diaphragm pump which is coaxial with the piston movement path and is located on one side of the piston seat, in the present application, the oil channel is distributed on both sides of the piston seat, in addition to the sealing of the piston seat, the sealing between the piston rod and the pump body is also required to prevent hydraulic oil leakage and insufficient oil pressure, thereby reducing the conveying efficiency of the pump.

[0019] Preferably, as an improvement, a plurality of circular holes for communicating the medium flow channel and the diaphragm chamber are formed in the side of the pump cover close to the diaphragm.

[0020] The above setting ensures that the pressure between the diaphragm chamber and the medium flow channel is consistent, at the same time, prevents too much fluid from flowing into the diaphragm chamber, reduces the corrosion effect on the diaphragm, and increases the service life of the diaphragm. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0023] Figure 3 This is a partial structural diagram of Embodiment 2 of the present invention.

[0024] Figure 4 This is a schematic diagram of the flexible mesh pressure tapping component in Embodiment 2 of the present invention. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method:

[0026] The reference numerals in the accompanying drawings include: pump cover 1, diaphragm chamber 2, double diaphragm 3, T-shaped metal pressure tapping ring 4, hydraulic chamber 5, oil passage 6, piston 7, piston cylinder 8, limit valve 9, pump body 10, first conveying unit 11, piston rod channel 12, packing hole 13, gland hole 14, piston gland 15, multi-stage sealing structure 16, second conveying unit 17, flexible mesh pressure tapping component 18, pressure tapping hole 19, pressure alarm device 20, suction valve 21, discharge valve 22.

[0027] Example 1

[0028] like Figures 1-4 As shown, the double-acting hydraulic PTFE diaphragm pump includes a pump body 10, a piston 7, and two delivery units. The piston 7 consists of a piston rod and a piston seat. From left to right, the pump body 10 has a gland hole 14, a packing hole 13, and a piston rod channel 12 with decreasing diameters. The gland hole 14, the packing hole 13, and the piston rod channel 12 are connected. The right side of the piston rod channel 12 is connected to the piston cylinder 8. The piston 7 reciprocates within the piston cylinder 8. A multi-stage sealing structure 16 is installed in the cavity formed by the piston rod and the pump body 10. The multi-stage sealing structure 16 is composed of alternating sealing rings and sealing packing. The right end of the multi-stage sealing structure 16 abuts against the wall of the packing hole 13, and the left end is pressed by the piston gland 15. The right end of the piston cylinder 8 is sealed by the end cap.

[0029] Two conveying units are symmetrically arranged along the piston cylinder 8 axis, and the two conveying units share a pump body 10. The two conveying units each include a pump cover 1, and the pump cover 1 is provided with a medium flow channel. The medium flow channel is provided with a suction valve 21 and a discharge valve 22 at two ends. The fluid in the medium flow channel is sequentially conveyed from bottom to top through the suction valve 21 and the discharge valve 22. The fluid in the two conveying units can be conveyed through a single flow channel or a double flow channel according to actual use requirements after passing through the discharge valve 22. The pump cover 1 and the pump body 10 are provided with a double-layer diaphragm 3. The double-layer diaphragm 3 forms a diaphragm chamber 2 and a hydraulic chamber 5 with the pump cover 1 and the pump body 10, respectively. The pump cover 1 is provided with a plurality of balance holes near one side of the double-layer diaphragm 3, which are used to communicate the medium flow channel and the diaphragm chamber 2. The double-layer diaphragm 3 is provided with a pressure taking device at both ends for pressure alarm. In the embodiment, the pressure taking device is a T-shaped metal pressure taking ring 4 installed between the double-layer diaphragm 3. The T-shaped metal pressure taking ring 4 is provided with an L-shaped hole. One end of the L-shaped hole is in communication with a pressure taking hole 19, and the other end of the pressure taking hole 19 is in communication with a pressure alarm device 20.

[0030] The pump body 10 is further provided with a mounting hole for mounting a limiting valve 9 and an oil channel 6 in communication with the piston cylinder 8. The limiting valve 9 is installed between the hydraulic chamber 5 and the oil channel 6 and is connected with an oil supplementing device. Thus, the early damage of the double-layer diaphragm 3 caused by excessive oil supplementing can be effectively avoided, and the service life of the double-layer diaphragm 3 is protected and prolonged. The inlets of the oil channels 6 of the two conveying units are respectively located above the left side and below the right side of the piston cylinder 8. The piston 7 reciprocates between the inlets of the two oil channels 6. The oil channel 6 is in the shape of an inverted “L”. The oil channel 6 includes an oil channel segment perpendicular to the piston cylinder 8 axis and an oil channel segment parallel to the piston cylinder 8 axis. The oil channel 6 is designed in a broken line type, which is beneficial to reducing the occupied space of the oil channel 6 under the premise of ensuring the sufficient path of the oil channel 6, thereby reducing the volume of the pump body 10 and the overall size of the diaphragm pump.

[0031] The specific implementation process is as follows:

[0032] Before operation, the double-acting hydraulic PTFE diaphragm pump of this invention requires connecting the suction valve 21 to the inlet pipe and the discharge valve 22 to the outlet pipe. Then, a suitable amount of hydraulic oil is injected into the piston cylinder 8 and the hydraulic chamber 5 via the oil cylinder. The diaphragm pump then begins operation, with the drive mechanism driving the piston 7 to reciprocate. When the piston 7 moves to the right, the space on the left side of the piston seat increases, and the hydraulic oil in the hydraulic chamber 5 of the first conveying unit 11, located above the axis of the piston cylinder 8, flows back through the limit valve 9 and the oil passage 6. The amount of hydraulic oil in the hydraulic chamber 5 decreases, thereby reducing the hydraulic pressure on the double-layer diaphragm 3. The double-layer diaphragm 3 moves towards the pump body 10. As the space of chamber 2 increases, the pressure decreases, and a negative pressure is formed between the diaphragm chamber 2 and the medium flow channel relative to the ambient air pressure. The suction valve 21 opens, and fluid flows into the medium flow channel from the inlet pipe. At the same time, the hydraulic oil on the right side of the piston seat is compressed, and the hydraulic oil in the second conveying unit 17 enters the hydraulic chamber 5 through the oil passage 6 and the limit valve 9. The amount of oil in the hydraulic chamber 5 increases, and the oil pressure of the hydraulic oil on the double-layer diaphragm 3 increases, pushing the double-layer diaphragm 3 toward the pump cover 1, compressing the space of the diaphragm chamber 2. The pressure in the diaphragm chamber 2 and the medium flow channel increases, and the discharge valve 22 opens. However, since there is no fluid in the medium flow channel at the beginning of the movement, no fluid is discharged from the second input unit at this time.

[0033] When piston 7 moves to its limit position to the right, it begins to move to the left. The hydraulic oil on the left side of the piston seat is compressed, and the hydraulic oil in the first conveying unit 11 enters the hydraulic chamber 5 through the oil passage 6 and the limit valve 9. The amount of oil in the hydraulic chamber 5 increases, and the oil pressure of the hydraulic oil on the double-layer diaphragm 3 increases. The diaphragm moves towards the pump cover 1, compressing the space of the diaphragm chamber 2. The pressure in the diaphragm chamber 2 and the medium flow channel increases, and the discharge valve 22 opens. The fluid flows out from the medium flow channel and enters the outlet pipeline for subsequent conveying, completing one complete fluid conveying cycle. At the same time, due to the backflow of hydraulic oil in the second conveying unit 17, the diaphragm chamber 2 and the medium flow channel form a negative pressure relative to the ambient air pressure. The suction valve 21 opens, and the fluid enters the medium flow channel. When piston 7 moves to its limit position to the left, it begins to move to the right, repeating the above actions to achieve continuous fluid alternation between the two conveying units.

[0034] Example 2

[0035] like Figures 3-4 As shown, in this preferred embodiment, the pressure-taking device is a flexible mesh pressure-taking component 18, which is made of multiple layers of flexible mesh fabric. The thickness of the flexible mesh pressure-taking component 18 is less than the thickness of any one of the diaphragms in the double-layer diaphragm 3. The mesh size of the flexible mesh pressure-taking component 18 is 40-60 meshes, so as to ensure that pressure can be taken smoothly when the double-layer diaphragm 3 breaks. At the same time, the thickness does not affect the sealing of the part where the double-layer diaphragm 3 clamps the flexible mesh pressure-taking component 18. Meanwhile, one end of the pressure-taking hole 19 is directly connected to the outer wall of the flexible mesh pressure-taking component 18.

[0036] Implementation process:

[0037] In actual use, one end of the pressure tapping hole 19 is in direct contact and communication with the outer wall of the flexible mesh pressure tapping piece 18. When either of the double-layer diaphragms is ruptured, the leaked liquid (hydraulic oil or medium fluid) enters the cavity between the double-layer diaphragms 3, flows through the flexible mesh pressure tapping piece 18, passes through the gaps between the interlaced meshes of the flexible mesh, and enters the pressure tapping hole 19 on the pump cover 1. The leaked liquid compresses the space of the original gas in the pressure tapping hole 19, so that the air pressure in the pressure tapping hole 19 increases. The pressure tapping hole 19 is in communication with the pressure alarm device 20, and the increase of the air pressure in the pressure tapping hole 19 causes the pressure of the display instrument on the pressure alarm device 20 to rise, thereby playing a rupture alarm function of the diaphragm. Compared with the T-shaped metal pressure tapping ring 4, the flexible mesh pressure tapping piece 18 has the advantages of simple structure, low cost, and reduced difficulty in the process of manufacturing. In addition, since the manufacturing material is a flexible material, it is not necessary to consider the damage of the pressure tapping ring to the diaphragm, thereby improving the service life of the diaphragm.

[0038] The above is only an embodiment of the present application, and common technical solutions and / or characteristics in the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A double-acting hydraulic PTFE diaphragm pump, characterized in that: The device includes a pump body, a piston, and two delivery units. The pump body has a piston rod channel and a piston cylinder for the reciprocating motion of the piston. The two delivery units are symmetrically arranged along the piston cylinder axis and share a pump body. Each delivery unit includes a pump cover. A double-layer diaphragm is installed between the pump cover and the pump body. The double-layer diaphragm forms a diaphragm chamber and a hydraulic chamber with the pump cover and the pump body, respectively. Pressure tapping devices for pressure alarm are installed at both ends of the double-layer diaphragm. The pump body has an oil passage connected to the piston cylinder. The pump body has a mounting hole for installing a limit valve. The limit valve is located between the hydraulic chamber and the oil passage. The oil passage inlets of the two conveying units are located at the upper left and lower right of the piston cylinder, respectively, and the piston seat of the piston reciprocates between the two inlets; The oil passages of the two conveying units are respectively located at the upper left and lower right of the piston cylinder. The oil passages are inverted "L" shape, including one section of oil passage perpendicular to the piston cylinder axis and two sections of oil passage parallel to the piston cylinder axis. The pressure tapping device is a flexible mesh pressure tapping component. The flexible mesh pressure tapping component is annular, and its outer peripheral edge contacts the pressure tapping hole. The mesh number of the flexible mesh pressure tapping component is 40-60 mesh, and the thickness of the flexible mesh pressure tapping component is less than the thickness of either diaphragm in the double-layer diaphragm.

2. The double-acting hydraulic PTFE diaphragm pump according to claim 1, characterized in that: The limit valve is connected to the oil replenishment device.

3. The double-acting hydraulic PTFE diaphragm pump according to claim 2, characterized in that: A multi-stage sealing structure is installed between the piston rod and the pump body.

4. The double-acting hydraulic PTFE diaphragm pump according to claim 3, characterized in that: The pump cover has multiple round holes on the side near the diaphragm for connecting the medium flow channel and the diaphragm chamber.

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