A booster pump

Abstract

The application provides a booster pump, which comprises a booster cylinder; the booster cylinder comprises a first cylinder body and a first piston in the first cylinder body; the first cylinder body and the first piston are metal structural members; the outer periphery of the first piston is provided with a first sealing ring and a first guide; the first guide is a self-lubricating plastic structural member; and the outer periphery of the first guide protrudes from the outer periphery of the first piston. In the technical scheme, the first guide is arranged on the outer periphery of the first piston, and the outer periphery of the first guide protrudes from the outer periphery of the first piston; therefore, if the first piston is inclined during movement, the first guide will be in contact with the first cylinder body, and direct contact and friction between the first piston and the first cylinder body can be avoided; since the first guide is a self-lubricating plastic, the friction between the first guide and the first cylinder body is small; therefore, the technical scheme can prolong the service life of the pump.

Description

Technical Field

[0001] This application relates to the field of pumps, and more specifically, to a booster pump. Background Technology

[0002] Some existing booster pumps use a piston to compress the gas or liquid fluid in the cylinder to increase the output fluid pressure. These booster pumps are prone to wear between the piston and the cylinder, which leads to a shorter service life. Utility Model Content

[0003] The purpose of this application is to provide a booster pump with a long service life.

[0004] The embodiments of this application are implemented as follows:

[0005] In a first aspect, embodiments of this application provide a booster pump, including a booster cylinder; the booster cylinder includes a first cylinder body and a first piston located within the first cylinder body, both the first cylinder body and the first piston are metal structural components, a first sealing ring and a first guide are provided on the outer periphery of the first piston, the first guide is a self-lubricating plastic structural component, and the outer periphery of the first guide protrudes beyond the outer periphery of the first piston.

[0006] In the above technical solution, the booster cylinder is a unit that uses a piston to compress fluid, thereby giving the output fluid a higher pressure. Therefore, both the first cylinder body and the first piston of the booster cylinder are metal structural components to withstand the greater pressure. Self-lubricating plastic refers to plastic that can release lubricant during friction and wear, possessing lubricating properties without the addition of external lubricant, thus reducing friction. By providing a first guide member on the outer periphery of the first piston, with the outer periphery of the first guide member protruding from the outer periphery of the first piston, if the first piston tilts during its movement, the first guide member will contact the first cylinder body, preventing direct contact and friction between these two metal structural components. Since the first guide member is made of self-lubricating plastic, the friction between it and the first cylinder body is minimal. Therefore, the above technical solution allows the booster pump to have a longer service life.

[0007] In some alternative embodiments, the first guide is interference-fitted between the outer periphery of the first piston and the first cylinder.

[0008] In the above technical solution, since the first guide member is interference-fitted between the outer periphery of the first piston and the first cylinder, the movement of the first piston within the first cylinder is always supported by the first guide member, making the movement of the first piston more stable.

[0009] In some alternative embodiments, the outer periphery of the first guide protrudes from the outer periphery of the first piston by 0.3 mm to 0.8 mm.

[0010] In the above technical solution, the outer periphery of the first guide protrudes beyond the outer periphery of the first piston within the above range, and the gap between the outer periphery of the first piston and the inner wall of the first cylinder is reasonable. On the one hand, it can achieve contact between the first guide and the first cylinder, and on the other hand, it can reduce the impact on the sealing effect of the first sealing ring.

[0011] In some alternative implementations, the first piston has a first mounting groove on its outer periphery, and the first guide is disposed within the first mounting groove.

[0012] In the above technical solution, by setting the first guide member in the first mounting groove, the first mounting groove can limit the first guide member during the movement of the first piston, thus preventing the first guide member from falling off the outer periphery of the first piston.

[0013] In some alternative implementations, a plurality of the first guide members are distributed circumferentially on the first piston.

[0014] In the above technical solution, the multiple first guide members distributed circumferentially can support the first piston from multiple directions. When the first piston tilts in multiple directions, the first guide members can rub against the inner wall of the first cylinder, so that the booster pump has a long service life.

[0015] In some alternative implementations, the first guide is an arc-shaped structure, and the arc length of the first guide accounts for more than 95% of the circumferential dimension of the first piston.

[0016] In the above technical solution, when the arc length of the first guide member and the axial dimension of the first piston satisfy the above relationship, the first guide member is distributed in multiple positions in the circumferential direction of the first piston. When the first piston is tilted in multiple directions, the first guide member can rub against the inner wall of the first cylinder, so that the booster pump has a longer service life.

[0017] In some alternative implementations, the first cylinder block is a steel structural component.

[0018] In the above technical solution, the first structural component is a steel structural component with relatively high wear resistance. Even after the first guide component fails, the booster pump can continue to work normally for a certain period of time even when there is friction with the first piston, thus giving the booster pump a longer service life.

[0019] In some alternative implementations, the inner surface of the first cylinder body is provided with a wear-resistant coating.

[0020] In the above technical solution, by providing a wear-resistant coating on the inner surface of the first cylinder, the service life of the first cylinder can be extended, thereby giving the booster pump a longer service life.

[0021] In some alternative embodiments, the wear-resistant coating is a DLC coating or a chrome plating layer to give the inner wall of the first cylinder good wear resistance.

[0022] In some alternative embodiments, the surface roughness Ra of the inner surface of the first cylinder is less than 0.4. In this embodiment, the surface roughness Ra of the inner surface of the first cylinder is less than 0.4, so the inner surface of the first cylinder is relatively smooth, which can reduce the frictional force when there is friction with the inner surface of the first cylinder, thereby giving the booster pump a longer service life.

[0023] In some alternative embodiments, the first piston is connected to a piston rod having a first end and a second end in the longitudinal direction, the first piston is connected to the first end, and the first guide is disposed on the side of the first sealing ring away from the second end.

[0024] When the piston rod is warped or deformed, the first piston may tilt, with a greater displacement occurring on the side of the first piston furthest from the second end of the piston rod. Therefore, placing the first guide member on the side of the first sealing ring furthest from the second end on the first piston can reduce the impact of the tilting of the first piston on the sealing effect of the first sealing ring.

[0025] In some alternative implementations, a drive cylinder and a spacer block are also included. The drive cylinder includes a second cylinder body, with the first cylinder body and the second cylinder body disposed on both sides of the spacer block. A second piston is disposed in the second cylinder body, and a piston rod is connected between the first piston and the second piston, the piston rod passing through the spacer block. A second guide member is disposed between the piston rod and the spacer block, the second guide member being a self-lubricating plastic structural component.

[0026] In the above technical solution, a second guide made of self-lubricating plastic is provided inside the spacer block. During the movement, the piston rod contacts the second guide instead of contacting and rubbing against the spacer block, which can reduce the friction on the piston rod and thus reduce the wear between the piston rod and the spacer block, giving the booster pump a longer service life.

[0027] In some alternative embodiments, a third guide is provided on the outer periphery of the second piston, the third guide being a self-lubricating plastic structural component.

[0028] In some alternative implementations, a reversing valve is also included, and a drive air passage passing through the reversing valve and the drive cylinder; the drive air passage connects to the internal cavity of the second cylinder from both sides of the second piston; the reversing valve is provided with an air inlet and has an air inlet chamber inside, the air inlet chamber connects the air inlet and the drive air passage, and the air inlet is provided with a filter screen.

[0029] In the above technical solution, the reversing valve is used to change the direction of movement of the second piston, and the air inlet is used to enter the driving medium. After passing through the air inlet chamber, the driving medium enters the second cylinder to drive the second piston. By setting a filter screen at the air inlet, impurities in the driving medium can be filtered out, thus avoiding excessive wear between the second piston and the second cylinder caused by impurities entering between them, and thus extending the service life of the booster pump.

[0030] In some optional embodiments, the drive air path includes a first drive branch, a second drive branch, and an exhaust passage disposed in the reversing valve. An air valve slider and a sealing plate are disposed within the intake chamber. The air valve slider has a communicating cavity, and the sealing plate has a first through hole communicating with the first drive branch, a second through hole communicating with the second drive branch, and a third through hole communicating with the exhaust passage.

[0031] The valve slider contacts the sealing plate surface, and the valve slider can reciprocate relative to the sealing plate between a first position and a second position. In the first position, the connecting cavity connects the first through hole and the third through hole, the connecting cavity does not connect with the second through hole, and the second through hole connects with the air intake cavity, so that the driving medium enters the second cylinder body from the second end of the second cylinder body through the second driving branch. In the second position, the connecting cavity connects the second through hole and the third through hole, the connecting cavity does not connect with the first through hole, and the first through hole connects with the air intake cavity, so that the driving medium enters the second cylinder body from the first end of the second cylinder body through the first driving branch.

[0032] In some optional implementations, the drive branch further includes a third drive branch and a fourth drive branch disposed on the drive cylinder; the first end of the third drive branch is connected to the interior of the second cylinder from the first end of the second cylinder body, and the second end is connected to the first drive branch; the first end of the fourth drive branch is connected to the interior of the second cylinder from the second end of the second cylinder body, and the second end is connected to the second drive branch. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the booster pump provided in an embodiment of this application;

[0035] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0036] Figure 3 A cross-sectional view of the first sealing ring provided in an embodiment of this application;

[0037] Figure 4 for Figure 1 Enlarged view of point B in the middle;

[0038] Figure 5 for Figure 1 Enlarged view of point C in the middle;

[0039] Figure 6 This is a schematic diagram showing the valve slider in its first position.

[0040] Figure 7 This is a schematic diagram showing the valve slider in the second position.

[0041] Figure 8 This is a schematic diagram of the drive cylinder in an embodiment of this application;

[0042] Figure 9 A schematic diagram illustrating the movement of a valve slider driven by an impeller, provided for an embodiment of this application;

[0043] Figure 10 The driving medium is used in the embodiments of this application.

[0044] Icons: 100 - Reversing valve; 111 - Intake chamber; 1110 - Intake port; 1111 - First pilot chamber; 1112 - Second pilot chamber; 1113 - Drive chamber; 1121 - First drive branch; 1122 - Second drive branch; 113 - Exhaust passage; 120 - Reversing drive component; 130 - Valve slider; 131 - Connecting chamber; 140 - Sealing plate; 141 - First through hole; 142 - Second through hole; 143 - Third through hole; 200 - Booster cylinder; 210 - ... 1. Cylinder block; 220-First piston; 221-First guide; 222-First mounting groove; 223-First sealing ring; 2231-Inner ring; 2232-Outer ring; 230-One-way valve; 300-Drive cylinder; 310-Second cylinder block; 320-Second piston; 321-Third guide; 322-Second sealing ring; 331-Third drive branch; 332-Fourth drive branch; 400-Piston rod; 500-Spacer block; 510-Second guide; 520-Shaft seal. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0047] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0048] In the description of this application, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0050] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] The inventors of this application have discovered that the piston in a booster pump needs to withstand significant pressure during fluid compression, which can cause the piston to tilt. Piston tilt leads to two main problems: firstly, a smaller gap between one side of the piston and the cylinder, resulting in excessive wear of the sealing ring on that side, potentially causing seal failure. This prevents the booster pump from pressurizing and outputting gas or liquid, shortening its lifespan. Secondly, the piston and its sealing ring may experience excessive compression on one side against the cylinder wall, leading to high friction and wear on both the cylinder and piston. This wear can even cause impurities to jam the piston, further shortening the booster pump's lifespan. Furthermore, wear between the piston rod and the cylinder can also occur, making piston tilting even more likely.

[0052] Based on this, this application provides a booster pump, such as Figure 1As shown, the system includes a reversing valve 100, a drive cylinder 300, and a booster cylinder 200. The booster cylinder 200 includes a first cylinder body 210 and a first piston 220 located within the first cylinder body 210. During forward movement, the first piston 220 draws the fluid to be pressurized into the first cylinder body 210. During reverse movement, it compresses the fluid drawn into the first cylinder body 210, increasing the fluid pressure. The booster cylinder 200 also includes a one-way valve 230. When the fluid pressure increases to the opening pressure of the one-way valve 230, the fluid is discharged from the first cylinder body 210, thus increasing the output fluid pressure. The drive cylinder 300 contains a second piston 320. The first piston 220 and the second piston 320 are connected by a piston rod 400. The area of ​​the first piston 220 is larger than the area of ​​the second piston 320. The directional valve 100 is used to provide a driving medium to the drive cylinder 300, which drives the second piston 320 to move. The directional valve 100 can also drive the medium into the drive cylinder 300 in both forward and reverse directions to push the second piston 320. The driving medium can be compressed air or hydraulic oil.

[0053] In the booster pump provided in this application, both the first cylinder 210 and the first piston 220 are metal structural components. Since the first cylinder 210 contains the fluid that needs to be pressurized, the high strength of both the first cylinder 210 and the first piston 220, being metal structural components, allows the booster pump to have a longer service life.

[0054] Furthermore, such as Figure 1 and Figure 2 As shown, a first sealing ring 223 and a first guide member 221 are provided on the outer periphery of the first piston 220. The first sealing ring 223 serves a sealing function. If the sealing function of the first sealing ring 223 fails, during the movement of the first piston 220 and the compression of the fluid, the fluid will leak from one side of the first piston 220 to the other side, which may result in the booster pump being unable to pressurize and output the fluid.

[0055] The first guide component 221 is a self-lubricating plastic structural component, and its outer periphery protrudes beyond the outer periphery of the first piston 220. Self-lubricating plastics are plastics that release lubricant during friction and wear, possessing lubricating properties without the addition of external lubricant, thus reducing friction. The self-lubricating plastic used in the first guide component 221 can be polyoxymethylene, or other lubricating plastics such as nylon, polyetheretherketone, polyimide, polytetrafluoroethylene, polystyrene, and polyethylene.

[0056] It is readily understood by those skilled in the art that most existing sealing rings are made of rubber, and compared to self-lubricating plastics, they possess a greater compressibility. That is, under the same compression, the sealing ring experiences less pressure, while the self-lubricating plastic withstands greater pressure. Therefore, compared to the case where the first piston 220 lacks a first guide 221, the case with a first guide 221 allows the first guide 221 to withstand more of the compressive force between the first cylinder 210 and the first piston 220, even if the first piston 220 tilts. Consequently, the pressure on the first sealing ring 223 from the first cylinder 210 and the first piston 220 is reduced, and the friction between the first sealing ring 223 and the first cylinder 210 is also less. This extends the service life of the first sealing ring 223, thereby giving the booster pump a longer service life.

[0057] Furthermore, since a first guide member 221 is provided on the outer periphery of the first piston 220, and the outer periphery of the first guide member 221 protrudes from the outer periphery of the first piston 220, if the first piston 220 tilts during its movement, the first guide member 221 will contact the first cylinder 210, thus avoiding direct contact and friction between the two metal structural components, the first piston 220 and the first cylinder 210. Since the first guide member 221 is made of self-lubricating plastic, the friction between it and the first cylinder 210 is small. Therefore, the above technical solution can enable the pump to have a longer service life. In some embodiments, the outer periphery of the first guide member 221 protrudes from the outer periphery of the first piston 220 by 0.3mm to 0.8mm, specifically 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm. The gap between the outer periphery of the first piston 220 and the inner wall of the first cylinder 210 is relatively reasonable. On the one hand, it can achieve contact between the first guide member 221 and the first cylinder 210, and on the other hand, it can reduce the impact on the sealing effect of the first sealing ring 223.

[0058] Furthermore, in some embodiments, the first guide member 221 is interference-fitted between the outer periphery of the first piston 220 and the first cylinder 210. That is, when the first piston 220 is not tilted or the booster pump is not working, one side of the first guide member 221 is in contact with the first piston 220, and the other opposite side is in contact with the inner wall of the first cylinder 210.

[0059] In other embodiments, there may be a gap between one side of the first guide member 221 and the first piston 220, or a gap between the other opposite side of the first guide member 221 and the inner wall of the first cylinder 210. In this embodiment, when the first piston 220 tilts or its movement direction deviates from the axial direction of the first cylinder 210, the first guide member 221 contacts the inner wall of the first cylinder 210 to provide guidance. That is, the first guide member 221 can provide guidance when the first piston 220 tilts or its movement path deviates; on the other hand, it can prevent direct wear between the first cylinder 210 and the first piston 220, thus extending the service life of the pump. It is easy to understand that in the embodiment where the first guide member 221 is interference-fitted between the outer periphery of the first piston 220 and the first cylinder 210, the first guide member 221 can be understood as always providing guidance to the first piston 220.

[0060] In some embodiments, a first piston 220 is connected to a first end along the length of the piston rod 400, and a second piston 320 is disposed at a second end along the length of the piston rod 400. On the outer periphery of the first piston 220, a first guide member 221 is disposed on the side of the first sealing ring 223 away from the second end of the piston rod 400. Tilting of the first piston 220 is often accompanied by bending of the piston rod 400, such as... Figure 1 As shown, when the piston rod 400 bends and deforms, causing the first piston 220 to tilt, the displacement on the side of the first piston 220 furthest from the second end of the piston rod 400 is greater. Therefore, by placing the first guide member 221 on the side of the first sealing ring 223 furthest from the second end, the tilting of the first piston 220 can be limited by the first guide member 221, and the deformation of the first sealing ring 223 can be reduced. This reduces the friction between the first sealing ring 223 and the first cylinder 210, thereby reducing the impact of the tilting of the first piston 220 on the sealing effect of the first sealing ring 223. Of course, in some other embodiments, the first guide member 221 can also be placed on the side of the first sealing ring 223 facing the second end of the piston rod 400. In some embodiments, the first guide member 221 can also be placed on both sides of the first sealing ring 223.

[0061] In some embodiments, a first mounting groove 222 is provided on the outer periphery of the first piston 220, and a first guide member 221 is disposed within the first mounting groove 222. By disposing the first guide member 221 within the first mounting groove 222, the first mounting groove 222 can limit the first guide member 221 during the movement of the first piston 220, preventing the first guide member 221 from falling off the outer periphery of the first piston 220.

[0062] Furthermore, the first mounting groove 222 may extend circumferentially along the first piston 220, that is, the first mounting groove 222 is an arc-shaped groove structure.

[0063] In other embodiments, the first mounting groove 222 may also extend along the axial direction of the first piston 220. In this embodiment, multiple first guide members 221 can be provided in the circumferential direction of the first piston 220 by providing multiple first mounting grooves 222 in the circumferential direction of the first piston 220.

[0064] In some other embodiments, the first mounting groove 222 may not be provided on the first piston 220, and the first guide member 221 may be pressed against the side of the first piston 220 near the outer periphery by a pressure plate.

[0065] In this embodiment, the number of first guide members 221 is only one. The first guide member 221 has an arc-shaped structure, and the arc length of the first guide member 221 accounts for more than 95% of the circumferential dimension of the first piston 220, further, the proportion can be 98% to 99%. When the arc length of the first guide member 221 accounts for more than 95% of the circumferential dimension of the first piston 220, the first guide member 221 is distributed in multiple positions in the circumferential direction of the first piston 220. When the first piston 220 is tilted in multiple directions, the first guide member 221 can rub against the inner wall of the first cylinder 210, so that the booster pump has a longer service life. In this embodiment, the first guide member 221 can be installed using a first mounting groove 222 extending along the circumferential direction of the first piston 220, that is, the first mounting groove 222 is also an arc-shaped groove structure.

[0066] In other embodiments, there may be multiple first guide members 221. The multiple first guide members 221 are evenly distributed circumferentially around the first piston 220. Furthermore, each first guide member 221 may be an arc-shaped structure and extend along the circumferential direction of the first piston 220.

[0067] In other embodiments, the first guide member 221 may also be a straight strip structure and extend along the circumferential direction of the first piston 220. In this embodiment, the multiple first guide members 221 distributed circumferentially on the first piston 220 can support the first piston 220 from multiple directions. Even when the first piston 220 is tilted in multiple directions, the first guide members 221 can rub against the inner wall of the first cylinder 210, thus giving the booster pump a longer service life. Preferably, the first guide members 221 are evenly distributed along the axial direction of the first piston 220.

[0068] In some implementations, such as Figure 2As shown, the cross-section of the first guide member 221 is rectangular. In other embodiments, the cross-section of the first guide member 221 may also be circular or elliptical.

[0069] In some implementations, such as Figure 3 As shown, the first sealing ring 223 includes an inner ring 2231 and an outer ring 2232 connected to each other. The inner ring is made of rubber material, which has good elasticity, while the outer ring is a wear-resistant structure, such as a wear-resistant structure made of a mixture of PTFE plastic (polytetrafluoroethylene) and graphite. Due to the presence of graphite, it also has a certain degree of self-lubricating properties. Under the elastic action of the inner ring, the outer ring of the first sealing ring 223 always maintains contact with the inner wall of the first cylinder 210, thereby playing a sealing role. Furthermore, because the outer ring has a certain degree of self-lubricating properties, it can reduce the wear between the first sealing ring 223 and the first cylinder 210, thus giving the booster pump a longer service life. Furthermore, a second mounting groove for mounting the first sealing ring 223 is provided on the outer periphery of the first piston 220, and the inner ring of the first sealing ring 223 is disposed in the second mounting groove; the cross section of the inner ring of the first sealing ring 223 is circular, so as to pre-compress the inner ring of the first sealing ring 223, so that the outer ring can better contact the inner wall of the first cylinder 210 under the pressure of the inner ring, thereby ensuring the sealing effect.

[0070] Furthermore, in some embodiments, a wear-resistant coating is also provided on the inner surface of the first cylinder 210. By providing a wear-resistant coating on the inner surface of the first cylinder 210, the service life of the first cylinder 210 can be extended, thereby giving the booster pump a longer service life. The wear-resistant coating can be an existing DLC ​​(Diamond Like Carbon) coating. DLC coating combines the high hardness of diamond with the lubricity of graphite; it is an amorphous coating film composed of carbon and hydrogen, possessing excellent wear resistance and lubricity, thus enabling the booster pump to have a longer service life.

[0071] In some embodiments, the wear-resistant coating on the inner surface of the first cylinder 210 may also be a chromium plating layer, that is, a layer of chromium is plated on the inner surface of the first cylinder 210 to increase the wear resistance of the inner surface of the first cylinder 210.

[0072] Furthermore, in some embodiments, the surface roughness Ra of the inner surface of the first cylinder 210 is less than 0.4. In this embodiment, the inner surface of the first cylinder 210 is relatively smooth, resulting in less friction when rubbing against the inner surface of the first cylinder 210. Therefore, even after the wear-resistant coating on the inner surface of the first cylinder 210 is worn away, the first piston 220 or the first guide member 221 on the first piston 220 can still contact and move relative to the inner surface of the first cylinder 210 for a relatively long time, thereby extending the lifespan of the booster pump.

[0073] Furthermore, in some embodiments, the first cylinder body 210 is a steel structural component. The first structural component is a steel structural component with relatively high wear resistance. Even after the first guide 221 or the wear-resistant coating fails, the booster pump can continue to work normally for a certain period of time when there is friction with the first piston 220, so that the booster pump has a long service life.

[0074] exist Figure 1 In the illustrated embodiment, the drive cylinder 300 includes a second cylinder body 310. A spacer block 500 is disposed between the drive cylinder 300 and the booster cylinder 200. The first cylinder body 210 and the second cylinder body 310 are respectively connected to both sides of the first spacer block 500. The spacer block 500 is a metal structural component that serves to connect the first cylinder body 210 and the second cylinder body 310. The piston rod 400 passes through the spacer block 500. A second guide member 510 is also disposed between the piston rod 400 and the spacer block 500. The second guide member 510 is also a self-lubricating plastic structural component. In this embodiment, by providing a second guide 510 between the piston rod 400 and the spacer block 500, the piston rod 400 can be slightly tilted before contact is made between the second guide 510 and the piston rod 400, instead of friction between the spacer block 500 and the second guide 510. The self-lubricating plastic second guide 510 reduces the frictional force on the piston rod 400, thus reducing wear and extending the service life of the booster pump. When the piston rod 400 is not tilted, there is a radial gap between the second guide 510 and the piston rod 400.

[0075] In some embodiments, the second guide member 510 is an annular structure; in other embodiments, the second guide member 510 may also be a block structure uniformly distributed along the circumferential direction of the piston rod 400.

[0076] Furthermore, such as Figure 1 and Figure 4 As shown, a shaft seal 520 is also provided between the piston rod 400 and the spacer block 500. There is a gap between the spacer block 500 and the piston rod 400. The shaft seal 520 plays a sealing role to prevent fluid in the first cylinder 210 or the second cylinder 310 from leaking through the gap between the spacer block 500 and the piston rod 400. Furthermore, shaft seals 520 and second guide members 510 are provided on both the side of the spacer block 500 near the first cylinder 210 and the side near the second cylinder 310. The two guide members are located between the two shaft seals 520.

[0077] In some implementations, such as Figure 5As shown, a third guide member 321 is provided on the outer periphery of the second piston 320, and the third guide member 321 is also a self-lubricating plastic structural component. Furthermore, the shape and installation method of the third guide member 321 can be the same as that of the first guide member 221. For example, in some embodiments, the third guide member 321 has an arc-shaped structure and is disposed in a second mounting groove on the outer periphery of the second piston 320. Furthermore, the third guide member 321 can also be interference-fitted between the second cylinder 310 and the second piston 320. By providing the third guide member 321 between the second piston 320 and the second cylinder 310, wear between the second cylinder 310 and the second piston 320 can be reduced, thereby giving the booster pump a longer service life.

[0078] Furthermore, a second sealing ring 322 is provided on the outer periphery of the second piston 320. The structure of the second sealing ring 322 may be the same as or different from that of the first sealing ring 223. Furthermore, on the outer periphery of the second piston 320, a third guide member 321 is provided on the side of the second sealing ring 322 away from the first end of the piston rod 400.

[0079] In some embodiments of this application, a driving medium is supplied to the second cylinder 310 via a driving air passage located between the reversing valve 100 and the driving cylinder 300. The driving air passage connects to the internal cavity of the second cylinder 310 from both sides of the second piston 320, thus enabling the alternating supply of driving medium from both sides of the second piston 320 to the second cylinder 310 to drive the second piston 320 to reciprocate. The reversing valve 100 is also provided with an air inlet 1110, and the reversing valve 100 has an air inlet chamber 111 inside. The air inlet chamber 111 connects the air inlet 1110 and the driving air passage. The driving medium enters the second cylinder 310 after passing through the air inlet 1110, the air inlet chamber 111, and the driving air passage in sequence. The air inlet 1110 is equipped with a filter screen to filter the driving medium entering from the air inlet 1110, thereby reducing impurities in the driving medium. Therefore, it can reduce the amount of impurities entering the second cylinder 310 with the driving medium, thereby reducing the possibility of impurities entering the gap between the second piston 320 and the second cylinder 310. This reduces the possibility of wear or even jamming of the inner wall of the second cylinder 310 and the second piston 320 due to impurities, and gives the booster pump a longer service life.

[0080] Furthermore, the filter screen is detachably installed at the air inlet 1110, which facilitates the removal and replacement of the filter screen and makes it convenient for customers to select during the purchase.

[0081] like Figure 6 and Figure 7As shown, the drive air path includes a first drive branch 1121, a second drive branch 1122, and an exhaust passage 113 disposed in the reversing valve 100. The intake chamber 111 of the reversing valve 100 also contains a valve slider 130 and a sealing plate 140. The valve slider 130 has a communicating cavity 131, and the sealing plate 140 has a first through hole 141 communicating with the first drive branch 1121, a second through hole 142 communicating with the second drive branch 1122, and a third through hole 143 communicating with the exhaust passage 113.

[0082] The valve slider 130 is in surface contact with the sealing plate 140, thus achieving a seal. The valve slider 130 can reciprocate relative to the sealing plate 140 between a first position and a second position; for example... Figure 6 As shown, in the first position, the connecting cavity 131 connects the first through hole 141 and the third through hole 143, but the connecting cavity 131 is not connected to the second through hole 142. The second through hole 142 is connected to the intake cavity 111, so that the driving medium enters the second cylinder 310 from the second end of the second cylinder 310 through the second driving branch 1122. Figure 7 As shown, in the second position, the connecting cavity 131 connects the second through hole 142 and the third through hole 143, and the connecting cavity 131 is not connected to the first through hole 141. The first through hole 141 is connected to the intake cavity 111, so that the driving medium enters the second cylinder 310 from the first end of the second cylinder 310 through the first driving branch 1121.

[0083] like Figure 1 , Figures 6 to 8 The drive air circuit further includes a third drive branch 331 and a fourth drive branch 332 disposed in the drive cylinder 300. The first end of the third drive branch 331 connects to the interior of the second cylinder 310 from the first end of the second cylinder 310, and the second end connects to the first drive branch 1121; the first end of the fourth drive branch 332 connects to the interior of the second cylinder 310 from the second end of the second cylinder 310, and the second end connects to the second drive branch 1122.

[0084] like Figure 1 , Figure 6 and Figure 8As shown, when the valve slider 130 is in the first position, the driving medium in the intake chamber 111 enters the second cylinder 310 from the second end through the second through hole 142, the second driving branch 1122, and the fourth driving branch 332, and then pushes the second piston 320 to move from right to left. The driving medium located to the left of the second piston 320 in the second cylinder 310 is discharged through the third driving branch 331, the first driving branch 1121, the first through hole 141, the connecting chamber 131, the third through hole 143, and the exhaust passage 113. During the movement of the second piston 320 from right to left, the first piston 220 moves synchronously, so that the chamber located to the right of the first piston 220 in the first cylinder 210 draws in the low-pressure fluid to be pressurized, and the fluid in the chamber located to the left of the first piston 220 increases in pressure and is squeezed out of the first cylinder 210 during the movement of the first piston 220 to the left.

[0085] like Figure 1 , Figure 7 and Figure 8 As shown, when the valve slider 130 is in the second position, the driving medium in the intake chamber 111 enters the second cylinder 310 from the first end through the first through hole 141, the first driving branch 1121, and the third driving branch 331, and then pushes the second piston 320 to move from left to right. The driving medium located to the right of the second piston 320 in the second cylinder 310 is discharged through the fourth driving branch 332, the second driving branch 1122, the second through hole 142, the connecting chamber 131, the third through hole 143, and the exhaust passage 113. During the movement of the second piston 320 from left to right, the first piston 220 moves synchronously, so that the chamber located to the left of the first piston 220 in the first cylinder 210 draws in the low-pressure fluid to be pressurized, and the fluid in the chamber located to the right of the first piston 220 increases in pressure and is squeezed out of the first cylinder 210 during the movement of the first piston 220 to the right.

[0086] In some implementations, such as Figure 9 As shown, a rotatable impeller can be used as a reversing drive 120 connected to the valve slider 130. The valve slider 130 can reciprocate between the first position and the second position by the forward and reverse rotation of the impeller. Furthermore, the impeller can be driven by a motor located outside the air inlet chamber 111.

[0087] In some implementations, such as Figure 10As shown, a reversing drive 120 connected to the valve slider 130 can be provided in the intake chamber 111, and the reversing drive 120 divides the intake chamber 111 into a first pilot chamber 1111 and a second pilot chamber 1112 located at both ends of the reversing drive 120, and a drive chamber 1113 located between the first pilot chamber 1111 and the second pilot chamber 1112. By alternately introducing a driving medium into the first pilot chamber 1111 and the second pilot chamber 1112, the reversing drive 120 is driven to move, thereby driving the valve slider 130 to reciprocate between the first position and the second position. Furthermore, a sealing plate 140 is provided in the drive chamber 1113, and the first through hole 141, the second through hole 142, and the third through hole 143 are all connected to the drive chamber 1113. The driving medium used to drive the reversing drive 120 can be the same as the driving medium used to drive the second piston 320. Both enter the reversing valve 100 through the air inlet 1110. Then, the channel structure in the reversing valve 100 sends part of the driving medium to the first pilot chamber 1111 and the second pilot chamber 1112 to drive the reversing drive 120.

[0088] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A booster pump, characterized in that, The system includes a booster cylinder; the booster cylinder includes a first cylinder body and a first piston located inside the first cylinder body. Both the first cylinder body and the first piston are metal structural components. The outer periphery of the first piston is provided with a first sealing ring and a first guide component. The first guide component is a self-lubricating plastic structural component, and the outer periphery of the first guide component protrudes beyond the outer periphery of the first piston.

2. The booster pump according to claim 1, characterized in that, The first guide member is interference-fitted between the outer periphery of the first piston and the first cylinder.

3. The booster pump according to claim 1, characterized in that, The outer periphery of the first guide protrudes 0.3mm to 0.8mm beyond the outer periphery of the first piston.

4. The booster pump according to claim 1, characterized in that, The first piston has a first mounting groove on its outer periphery, and the first guide member is disposed in the first mounting groove.

5. The booster pump according to claim 1, characterized in that, The first piston has multiple first guide members distributed circumferentially.

6. The booster pump according to claim 1, characterized in that, The first guide is an arc-shaped structure, and the arc length of the first guide accounts for more than 95% of the circumferential dimension of the first piston.

7. The booster pump according to claim 1, characterized in that, The first cylinder body is a steel structural component.

8. The booster pump according to claim 1, characterized in that, The inner surface of the first cylinder is provided with a wear-resistant coating.

9. The booster pump according to claim 8, characterized in that, The wear-resistant coating is a DLC coating or a chrome plating layer.

10. The booster pump according to claim 1, characterized in that, The surface roughness Ra of the inner surface of the first cylinder is less than 0.

4.

11. The booster pump according to claim 1, characterized in that, The first piston is connected to a piston rod, which has a first end and a second end in the length direction. The first piston is connected to the first end, and the first guide is disposed on the side of the first sealing ring away from the second end.

12. The booster pump according to claim 1, characterized in that, It also includes a drive cylinder and a spacer block. The drive cylinder includes a second cylinder body. The first cylinder body and the second cylinder body are disposed on both sides of the spacer block. A second piston is disposed in the second cylinder body. A piston rod is connected between the first piston and the second piston. The piston rod passes through the spacer block. A second guide member is disposed between the piston rod and the spacer block. The second guide member is a self-lubricating plastic structural component.

13. The booster pump according to claim 12, characterized in that, The second piston is provided with a third guide member on its outer periphery, and the third guide member is a self-lubricating plastic structural component.

14. The booster pump according to claim 12, characterized in that, It also includes a reversing valve and a drive air passage through the reversing valve and the drive cylinder; the drive air passage connects to the internal cavity of the second cylinder from both sides of the second piston; the reversing valve is provided with an air inlet and has an air inlet chamber inside, the air inlet chamber connects the air inlet and the drive air passage, and the air inlet is provided with a filter screen.

15. The booster pump according to claim 14, characterized in that, The drive air circuit includes a first drive branch, a second drive branch, and an exhaust passage disposed in the reversing valve; The air intake chamber is provided with a valve slider and a sealing plate. The valve slider has a communicating cavity, and the sealing plate has a first through hole communicating with the first drive branch, a second through hole communicating with the second drive branch, and a third through hole communicating with the exhaust channel. The valve slider contacts the sealing plate surface, and the valve slider can reciprocate relative to the sealing plate between a first position and a second position. In the first position, the connecting cavity connects the first through hole and the third through hole, the connecting cavity does not connect with the second through hole, and the second through hole connects with the air intake cavity, so that the driving medium enters the second cylinder body from the second end of the second cylinder body through the second driving branch. In the second position, the connecting cavity connects the second through hole and the third through hole, the connecting cavity does not connect with the first through hole, and the first through hole connects with the air intake cavity, so that the driving medium enters the second cylinder body from the first end of the second cylinder body through the first driving branch.

16. The booster pump according to claim 15, characterized in that, The drive branch also includes a third drive branch and a fourth drive branch disposed in the drive cylinder; The first end of the third drive branch is connected to the interior of the second cylinder from the first end of the second cylinder, and the second end is connected to the first drive branch; the first end of the fourth drive branch is connected to the interior of the second cylinder from the second end of the second cylinder, and the second end is connected to the second drive branch.

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