A fluid booster device

Abstract

This invention discloses a fluid booster device, comprising a first cylinder and two second cylinders. The two ends of the first cylinder are connected to a first fluid source via reversing valves. The two ends of a first piston within the first cylinder are respectively driven to a second piston inside one of the second cylinders. The diameter of the first piston is larger than the diameter of the second pistons. Each second cylinder is connected to: a first check valve connecting the second cylinder to an oil tank; a second check valve connecting the second cylinder to downstream equipment; a third check valve connecting the second cylinder to the reversing valve; and a transmission mechanism connecting the valve core of the second piston and the third check valve. The transmission mechanism allows the second cylinder to supply a second fluid to the reversing valve when the third check valve approaches the second piston. Notably, the transmission mechanism for switching the gas flow direction and the third check valve are not located inside the first cylinder, thereby increasing the stroke of the first piston and reducing pressure fluctuations of the second fluid when switching the forward direction of the first piston.

Description

Technical Field

[0001] This invention relates to the field of fluid displacement machinery, and more specifically to a fluid pressurization device. Background Technology

[0002] A reciprocating pneumatic pump is a type of pump that uses compressed air as a power source to make the piston in its cylinder reciprocate, thereby continuously outputting low-pressure fluid as high-pressure fluid.

[0003] In existing reciprocating pneumatic pumps, an integrated pilot directional valve is usually installed outside the pump body. Gas enters the cylinder through the pilot directional valve, pushes the piston to move, and then is discharged directly. A main control valve is required inside the pump body to switch the gas flow direction so that the piston can reciprocate. This makes maintenance inconvenient. Because the main control valve occupies some space inside the pump body, the reciprocating stroke of the piston is small and the output fluid pressure is small. Summary of the Invention

[0004] The purpose of this invention is to provide a fluid booster device to solve the problem in existing reciprocating pneumatic pumps where the main control valve occupies space inside the pump body, resulting in a small reciprocating stroke of the piston and a small output fluid pressure.

[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0006] A fluid booster device includes: a first cylinder and two second cylinders. The two ends of the first cylinder are connected to a first fluid source via reversing valves. The reversing valves switch the flow direction of the first fluid entering the two ends of the first cylinder to drive a first piston inside the first cylinder to perform reciprocating movement. The two ends of the first piston are respectively connected to a second piston inside one of the second cylinders. The diameter of the first piston is larger than the diameter of the second pistons. Each second cylinder has a first check valve connected to its end furthest from the first cylinder, connecting the second cylinder to an oil tank and allowing the second cylinder to draw fluid from the oil tank. A second fluid; a second check valve, connecting the second cylinder and a downstream device, and allowing the second cylinder to deliver the second fluid to the downstream device; a third check valve, connecting the second cylinder and one end of the reversing valve, and allowing the reversing valve to deliver the second fluid to the second cylinder; a transmission mechanism, connecting the second piston and the valve core of the third check valve, disabling the third check valve when the second piston approaches the third check valve, and restoring the third check valve when the second piston moves away from the third check valve, so that the third check valve allows the second cylinder to deliver the second fluid to the reversing valve when the second piston approaches.

[0007] Furthermore, the third one-way valve includes: a valve housing fixedly connected to the second cylinder body, the interior of the valve housing having an oil hole communicating with the second cylinder body and the reversing valve; a one-way valve core slidably mounted in the valve housing; and an elastic element connecting the valve housing and the end of the one-way valve core away from the second cylinder body, the elastic element driving the one-way valve core to move by its own internal force so that the end of the one-way valve core near the second cylinder body covers the oil hole.

[0008] Furthermore, the one-way valve core includes: a guide rod disposed inside the oil hole and capable of sliding along the axis of the oil hole, the guide rod not closing the oil hole, allowing hydraulic oil to flow along the gap between the guide rod and the oil hole; a seal disposed outside the oil hole and fixedly connected to one end of the guide rod near the second cylinder body, the seal covering and closing the oil hole; and a follower disposed outside the oil hole and fixedly connected to one end of the guide rod away from the second cylinder body, the diameter of the follower being larger than the oil hole, and an elastic element connecting the valve body and the follower.

[0009] Furthermore, the transmission mechanism includes: a slider disposed inside the second cylinder and fixedly connected to the one-way valve core; and an inclined guide disposed inside the second cylinder and fixedly connected to the second piston. The inclined guide includes: driving the slider to move away from the valve housing after contacting the slider, so that the one-way valve core moves away from the inclined surface of the oil hole.

[0010] Furthermore, the slider is spherical, the slider is connected to the one-way valve core via a rod, the oblique guide is triangular, and the oblique guide has an opening formed on it to avoid the rod.

[0011] In another embodiment, the transmission mechanism includes a slider, an inclined guide, and a one-way clutch; the one-way clutch is fixedly connected to the one-way valve core via a rod, and includes a rotating shaft perpendicular to the movement direction of the second piston; the slider includes a wheel portion and a cam portion, the wheel portion and the cam portion being integral and staggered along the axial direction of the rotating shaft of the one-way clutch, the base circle diameter of the cam portion being equal to the diameter of the wheel portion, the wheel portion being coaxially connected to the rotating shaft of the one-way clutch, so that the slider can rotate unidirectionally around the rotating shaft, and the top of the cam portion always faces downward when no external force is applied; the inclined guide includes an inclined surface and a friction surface, the inclined surface being used to contact the cam profile of the cam portion to guide the slider to move linearly. The friction surface is horizontal and is used to contact the outer circumferential surface of the wheel portion to guide the slider to rotate. The height of the friction surface is higher than the bottom edge of the inclined surface. When the inclined guide is close to the slider, the one-way clutch restricts the rotation of the slider when the inclined surface contacts the cam profile, and the slider moves in a direction away from the valve housing. When the inclined guide is away from the slider, the slider rotates so that the base circle of the cam contacts the inclined surface, and at the same time the wheel portion and the friction surface contact each other. At this time, the oil hole is closed by the one-way valve core. When the inclined guide is separated from the slider, the friction surface drives the wheel portion to continue rotating at least 180° so that the slider can continue to rotate under the action of inertia until it returns to the initial posture of the cam portion with the top facing downward.

[0012] Furthermore, a stop is provided inside the second cylinder body, the stop being fixedly connected to the second cylinder body, and the stop being located at the end of the stroke of the second piston or the inclined guide.

[0013] Furthermore, the first cylinder and the second cylinder are coaxially and fixedly connected, and the first piston is coaxially and fixedly connected to the second piston through the piston rod.

[0014] Furthermore, the third check valve is connected to the directional valve via a throttle valve.

[0015] Furthermore, the first fluid is compressed air, the first fluid source is an air cylinder containing compressed air, the first cylinder is a cylinder, the air cylinder is connected to a pressure gauge through a shut-off valve, the air cylinder is connected to one end of the reversing valve through another shut-off valve, the other end of the reversing valve is equipped with a muffler and connected to the atmosphere; the second fluid is hydraulic oil, and the second cylinder is a hydraulic cylinder.

[0016] Compared with the prior art, this application has the following advantages:

[0017] A fluid booster device is provided, which switches the position of the valve core of the reciprocating valve by the reciprocating motion of the first piston, thereby reciprocating the operation of the two second cylinders to suck in and discharge the second fluid, and thus stably delivers the second fluid to downstream equipment through the second piston. Furthermore, the transmission mechanism for switching the gas flow direction and the third check valve are not inside the first cylinder, thereby increasing the stroke of the first piston and reducing the pressure fluctuation of the second fluid when switching the forward direction of the first piston. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] Figure 1 This is a system diagram of an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of a partial structure of Embodiment 1 of the present invention;

[0021] Figure 3 for Figure 2 Enlarged view of the local structure;

[0022] Figure 4 This is a perspective view of the transmission mechanism of Embodiment 2 of the present invention;

[0023] Figure 5 This is a schematic diagram of the first working condition of the transmission mechanism in Embodiment 2 of the present invention, in which the inclined guide moves toward the slider;

[0024] Figure 6 This is a schematic diagram of the second working condition of the transmission mechanism in Embodiment 2 of the present invention. In the figure, the inclined guide pushes the slider upward, so that the one-way valve core performs a vertical upward linear movement.

[0025] Figure 7 This is a schematic diagram of the third working condition of the transmission mechanism in Embodiment 2 of the present invention. In the figure, the slider slides along the inclined plane and rotates at the same time, causing the one-way valve core to perform a downward quick return motion.

[0026] Figure 8 This is a schematic diagram of the fourth working condition of the transmission mechanism in Embodiment 2 of the present invention. In the figure, the slider rotates along the friction surface, so that the slider returns to its initial posture.

[0027] The labels in the diagram represent the following:

[0028] 1-First cylinder block; 11-First piston; 12-Piston rod; 2-Second cylinder block; 21-Second piston; 22-Oil tank; 23-Stop; 3-Reversing valve; 31-Throttle valve; 32-Muffler; 4-First check valve; 5-Second check valve; 6-Third check valve; 61-Valve housing; 62-Oil hole; 63-One-way valve core; 64-Guide rod; 65-Seal; 66-Driven component; 67-Elastic component; 7-Transmission mechanism; 71-Slider; 72-Rod; 73-Gear; 74-Cam; 75-Angled guide; 76-Angled surface; 77-Opening; 78-Friction surface; 79-One-way clutch. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The following provides a fluid booster device; please refer to it. Figure 1 , 2 Example 1 is shown in Figure 3.

[0031] The fluid booster includes a first cylinder 1 and two second cylinders 2. The two ends of the first cylinder 1 are connected to a first fluid source through a reversing valve 3. The reversing valve 3 is used to switch the flow direction of the first fluid entering the two ends of the first cylinder 1 so as to drive the first piston 11 inside the first cylinder 1 to perform reciprocating movement. The two ends of the first piston 11 are respectively connected to the second piston 21 inside the second cylinder 2.

[0032] The diameter of the first piston 11 is larger than the diameter of the second piston 21, and each second cylinder 2 is connected to the end furthest from the first cylinder 1 by:

[0033] The first check valve 4 connects the second cylinder 2 and the oil tank 22, and allows the second cylinder 2 to draw the second fluid from the oil tank 22;

[0034] The second check valve 5 connects the second cylinder 2 and the downstream device, and allows the second cylinder 2 to deliver the second fluid to the downstream device;

[0035] The third check valve 6 is connected to one end of the second cylinder 2 and the reversing valve 3, and allows the reversing valve 3 to deliver the second fluid to the second cylinder 2;

[0036] The transmission mechanism 7 connects the valve core of the second piston 21 and the third check valve 6. When the second piston 21 approaches the third check valve 6, the third check valve 6 is deactivated, and when the second piston 21 moves away from the third check valve 6, the third check valve 6 is restored, so that the third check valve 6 allows the second cylinder 2 to deliver the second fluid to the reversing valve 3 when the second piston 21 approaches.

[0037] The working principle of the fluid booster device is as follows: it generates a stable pressure for delivering the second fluid by cyclically executing two operating conditions.

[0038] First operating condition: The first fluid source delivers the first fluid to one end of the first cylinder 1 through the reversing valve 3, thereby driving the first piston 11 to move in the first direction. The first piston 11 drives the two second pistons 21 inside the two second cylinders 2 to move synchronously in the first direction. Among them, the second piston 21 inside one oil tank 22 is close to the first cylinder 1, and draws the second fluid from inside the oil tank 22 through the first check valve 4, and draws the second fluid from one end of the reversing valve 3 through the third check valve 6. The second piston 21 inside the other oil tank 22 is away from the first cylinder 1, and delivers the second fluid to the downstream equipment through the second check valve 5, and delivers the second fluid to the other end of the reversing valve 3 through the transmission mechanism 7 to disable the third check valve 6.

[0039] Second operating condition: The flow of the second fluid at both ends of the reversing valve 3 causes the valve core inside the reversing valve 3 to move. The first fluid source delivers the first fluid to the other end of the first cylinder 1 through the reversing valve 3 to drive the first piston 11 to move in the second direction. The two oil tanks 22 exchange their operations, causing the second cylinder 2, which has been emptied of the second fluid, to draw the second fluid from inside the oil tank 22, while the second cylinder 2, which is filled with the second fluid, delivers the second fluid to the downstream equipment. Furthermore, when the first piston 11 approaches another third check valve 6, it is disabled by the transmission mechanism 7, causing the second fluid at both ends of the reversing valve 3 to flow in the opposite direction to that in the first operating condition.

[0040] The fluid booster device switches between the first and second operating conditions by moving the valve core of the reversing valve 3 back and forth, thereby reciprocating but stably delivering the second fluid to the downstream equipment. During the reversal, the second fluid can maintain a stable and unfluid pressure.

[0041] Compared to the prior art, in this embodiment, the valve used to switch the gas flow direction so that the piston can reciprocate is not inside the first cylinder 1, and will not affect the stroke of the first piston 11, thereby enabling a stable output of high-pressure second fluid.

[0042] It should also be noted that in this embodiment:

[0043] The first fluid is 0.5MPa compressed air. The first fluid source is an air cylinder (not shown in the figure) that stores compressed air. The first cylinder 1 is a cylinder. The air cylinder is connected to a pressure gauge through a shut-off valve. The air cylinder is connected to one end of a reversing valve 3 through another shut-off valve. The other end of the reversing valve 3 is equipped with a silencer 32 and is connected to the atmosphere.

[0044] The second fluid is hydraulic oil, and the second cylinder 2 is an oil cylinder. The pressure difference between air pressure and oil pressure is formed by the difference in diameter between the first piston 11 and the second piston 21.

[0045] Please refer to Figure 1 The third check valve 6 is connected to the directional valve 3 via the throttle valve 31 to prevent excessive hydraulic pressure inside the cylinder from damaging the directional valve 3.

[0046] Please refer to Figure 2 , 3 The first cylinder 1 and the second cylinder 2 are coaxially and fixedly connected, and the first piston 11 is coaxially and fixedly connected to the second piston 21 through the piston rod 12.

[0047] Please refer to Figure 3 The third check valve 6 includes:

[0048] The valve housing 61 is fixedly connected to the second cylinder 2, and an oil hole 62 is formed inside the valve housing 61 that connects the second cylinder 2 and the reversing valve 3.

[0049] The one-way valve core 63 is slidably installed in the valve housing 61. The end of the one-way valve core 63 away from the second cylinder 2 is connected to the valve housing 61 through the elastic element 67. The elastic element 67 drives the one-way valve core 63 to move by its own internal force so that the end of the one-way valve core 63 close to the second cylinder 2 covers the oil hole 62.

[0050] Specifically, the one-way valve core 63 includes:

[0051] The guide rod 64 is located inside the oil hole 62 and can slide along the axis of the oil hole 62. The guide rod 64 does not close the oil hole 62, and the hydraulic oil can flow along the gap between the guide rod 64 and the oil hole 62.

[0052] A seal 65 is disposed on the outside of the oil hole 62 and is fixedly connected to one end of the guide rod 64 near the second cylinder 2. The seal 65 can cover the oil hole 62, thereby restricting the stroke of the one-way valve core 63 moving away from the second cylinder 2. The seal 65 covers the oil hole 62 without gaps. When hydraulic oil flows through the oil hole 62 toward the reversing valve 3, the seal 65 seals the oil hole 62 to prevent the flow of hydraulic oil. When hydraulic oil flows through the oil hole 62 toward the second cylinder 2, the seal 65 is pushed open by the pressure of the hydraulic oil, allowing hydraulic oil to flow inside the one-way valve core 63.

[0053] The follower 66 is located outside the oil hole 62 and is fixedly connected to the end of the guide rod 64 away from the second cylinder 2. The diameter of the follower 66 is larger than that of the oil hole 62, which restricts the stroke of the one-way valve core 63 in the direction closer to the second cylinder 2. The elastic element 67 is a spring, which is sleeved on the guide rod 64. The two ends of the spring abut against the valve housing 61 and the follower 66 respectively. The spring causes the one-way valve core 63 to move in the direction away from the second cylinder 2, thereby driving the seal 65 to cover the oil hole 62.

[0054] The transmission mechanism 7 includes:

[0055] The slider 71 is located inside the second cylinder 2 and is fixedly connected to the one-way valve core 63;

[0056] An inclined guide 75 is disposed inside the second cylinder 2 and is fixedly connected to the second piston 21. The inclined guide 75 includes a contact slider 71 that drives the slider 71 to move away from the valve housing 61, so that the one-way valve core 63 moves away from the inclined surface 76 of the oil hole 62.

[0057] When the second piston 21 inside a second cylinder 2 approaches a third check valve 6, the inclined guide 75 drives the slider 71 to move away from the valve housing 61 via the inclined surface 76, causing the check valve core 63 to release the cover of the oil hole 62. At this time, the third check valve 6 can freely pass through the hydraulic oil. The hydraulic oil inside the cylinder is delivered to the downstream equipment through the second check valve 5, and also delivered to one side of the directional valve 3 through the third check valve 6. The valve core of the directional valve 3 moves towards the other side of the directional valve 3, and the hydraulic oil on the other side of the directional valve 3 flows to another third check valve 6. The hydraulic oil overcomes the internal force of the spring and pushes open the check valve core 63, and then flows into the interior of another second cylinder 2.

[0058] When the second piston 21 is located between the two third check valves 6 and the oblique guide 75 is not in contact with either slider 71, the two third check valves 6 are always closed, and the reversing valve 3 maintains the current flow direction of compressed air.

[0059] It should also be noted that:

[0060] The slider 71 is spherical and is connected to the one-way valve core 63 via a cylindrical rod 72. The inclined guide 75 is triangular and has an opening 77 formed on it to avoid the rod 72.

[0061] The second cylinder 2 is equipped with a stop 23 inside. The stop 23 is fixedly connected to the second cylinder 2 and is located at the end of the stroke of the second piston 21 or the oblique guide 75. When the reversing valve 3 malfunctions, the second piston 21 or the oblique guide 75 stops moving when it contacts the stop 23, preventing the oblique guide 75 from moving excessively and damaging the third check valve 6.

[0062] Furthermore, the above embodiments have another insurmountable drawback:

[0063] After the inclined guide 75 contacts the slider 71, the third check valve 6 opens, and the hydraulic oil inside the second cylinder 2 is squeezed to one end of the reversing valve 3, thereby switching the flow direction of the compressed air through the reversing valve 3. Then, the second piston 21 decelerates to a stop and then performs a return motion. During the return motion of the second piston 21, the third check valve 6 remains open until the inclined guide 75 separates from the slider 71. This means that a portion of the hydraulic oil at the end of the reversing valve 3 will be drawn into the second cylinder 2 through the oil hole 62, making it difficult for the valve core of the reversing valve 3 to remain stable at the end of the reversing valve 3.

[0064] If the stroke of the second piston 21 and the contact angle between the inclined guide 75 and the slider 71 are precisely designed through accurate calculation, so that the inclined guide 75 immediately separates from the slider 71 during the return stroke of the second piston 21, the position fluctuation of the valve core of the reversing valve 3 can indeed be reduced.

[0065] However, as the fluid booster operates and the various parts age, the third check valve 6 may remain open during the return stroke of the second piston 21, which can cause the valve core of the reversing valve 3 to fail to be in place.

[0066] To solve the aforementioned technical problems, a preferred transmission mechanism 7 is provided below, which can immediately close the third one-way valve 6 at the instant the first piston 11 returns to its original position. Please refer to [reference needed]. Figure 4 Example 2 is shown.

[0067] The transmission mechanism 7 includes a slider 71, an inclined guide 75, and a one-way clutch 79;

[0068] The slider 71 includes a wheel portion 73 and a cam portion 74, which are staggered along the axis of the one-way clutch 79. The base circle diameter of the cam portion 74 is equal to the diameter of the wheel portion 73.

[0069] The inclined guide 75 includes an inclined surface 76 and a friction surface 78. The inclined surface 76 is used to contact the cam profile of the cam portion 74 to guide the slider 71 to move linearly. The friction surface 78 is horizontal and is used to contact the outer circumferential surface of the wheel portion 73 to guide the slider 71 to rotate.

[0070] The one-way clutch 79 is fixedly connected to the rod portion 72. The one-way clutch 79 includes a rotating shaft perpendicular to the moving direction of the second piston 21. The wheel portion 73 is coaxially connected to the rotating shaft of the one-way clutch 79, so that the slider 71 can rotate unidirectionally around the rotating shaft. When no external force is applied, the top of the cam portion 74 always faces downward.

[0071] Please refer to Figure 5 , 6 When the inclined guide 75 approaches the slider 71, the one-way clutch 79 restricts the rotation of the slider 71 when the inclined surface 76 contacts the cam profile, and the slider 71 moves in a direction away from the valve housing 61; for example, when the second piston 21 moves to the right, the slider 71 cannot rotate counterclockwise, but can only rise vertically.

[0072] Please refer to Figure 7 When the inclined guide 75 moves away from the slider 71, the slider 71 rotates so that the base circle of the cam contacts the inclined surface 76, and at the same time the wheel part 73 contacts the friction surface 78. At this time, the oil hole 62 is closed by the one-way valve core 63. For example, when the second piston 21 moves to the left, the slider 71 can rotate clockwise.

[0073] Please refer to Figure 8 When the inclined guide 75 separates from the slider 71, the friction surface 78 drives the wheel part 73 to continue rotating at least 180°, so that the slider 71 can continue to rotate under the action of inertia until it returns to the initial posture of the cam part 74 with the top facing downward.

[0074] The advantages of the transmission mechanism 7 are: when the second piston 21 moves away from the third check valve 6, the third check valve 6 accelerates the movement of the check valve core 63 by the vertical downward and counterclockwise rotation of the cam part 74, so that the check valve core 63 immediately closes the oil hole 62, thus avoiding the problem of hydraulic oil at the end of the reversing valve 3 being sucked into the second cylinder 2.

[0075] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A fluid booster device, characterized in that, include: A first cylinder (1) and two second cylinders (2) are provided. The two ends of the first cylinder (1) are connected to a first fluid source through a reversing valve (3). The reversing valve (3) is used to switch the flow direction of the first fluid entering the two ends of the first cylinder (1) to drive the first piston (11) inside the first cylinder (1) to perform reciprocating movement. The two ends of the first piston (11) are respectively connected to a second piston (21) inside a second cylinder (2). Wherein, the diameter of the first piston (11) is larger than the diameter of the second piston (21), and each of the second cylinders (2) is connected to the end away from the first cylinder (1) by: A first check valve (4) connects the second cylinder (2) and the oil tank (22) and allows the second cylinder (2) to draw a second fluid from the oil tank (22); A second check valve (5) is connected to the second cylinder (2) and the downstream device, and allows the second cylinder (2) to deliver a second fluid to the downstream device; A third check valve (6) is connected to one end of the second cylinder (2) and the reversing valve (3), and allows the reversing valve (3) to deliver a second fluid to the second cylinder (2); The transmission mechanism (7) connects the valve core of the second piston (21) and the third check valve (6), disables the third check valve (6) when the second piston (21) approaches the third check valve (6), and restores the third check valve (6) when the second piston (21) moves away from the third check valve (6), so that the third check valve (6) allows the second cylinder (2) to deliver the second fluid to the reversing valve (3) when the second piston (21) approaches.

2. The fluid booster device according to claim 1, characterized in that, The third check valve (6) includes: A valve housing (61) is fixedly connected to the second cylinder body (2), and an oil hole (62) is formed inside the valve housing (61) to communicate with the second cylinder body (2) and the reversing valve (3); A one-way valve core (63) is slidably mounted in the valve housing (61); An elastic element (67) connects the valve housing (61) and the one-way valve core (63) at the end away from the second cylinder (2). The elastic element (67) drives the one-way valve core (63) to move by its own internal force so that the end of the one-way valve core (63) close to the second cylinder (2) covers the oil hole (62).

3. The fluid booster device according to claim 2, characterized in that, The one-way valve core (63) includes: A guide rod (64) is disposed inside the oil hole (62) and is able to slide along the axis of the oil hole (62). The guide rod (64) does not close the oil hole (62), and hydraulic oil can flow along the gap between the guide rod (64) and the oil hole (62). A seal (65) is provided on the outside of the oil hole (62) and is fixedly connected to one end of the guide rod (64) near the second cylinder (2). The seal (65) can cover and close the oil hole (62). A follower (66) is disposed outside the oil hole (62) and fixedly connected to the end of the guide rod (64) away from the second cylinder (2). The diameter of the follower (66) is larger than that of the oil hole (62). The elastic member (67) connects the valve body (61) and the follower (66).

4. The fluid booster device according to claim 3, characterized in that, The transmission mechanism (7) includes: A slider (71) is disposed inside the second cylinder (2) and is fixedly connected to the one-way valve core (63); An inclined guide (75) is disposed inside the second cylinder (2) and fixedly connected to the second piston (21). The inclined guide (75) includes: after contacting the slider (71), driving the slider (71) to move in a direction away from the valve housing (61) so that the one-way valve core (63) moves away from the inclined surface (76) of the oil hole (62).

5. A fluid booster device according to claim 4, characterized in that, The slider (71) is spherical and is connected to the one-way valve core (63) via a rod (72). The inclined guide (75) is triangular and has an opening (77) formed on it to avoid the rod (72).

6. The fluid booster device according to claim 3, characterized in that, The transmission mechanism (7) includes a slider (71), an inclined guide (75), and a one-way clutch (79); The one-way clutch (79) is fixedly connected to the one-way valve core (63) via a rod (72), and the one-way clutch (79) includes a rotating shaft perpendicular to the moving direction of the second piston (21); The slider (71) includes a wheel portion (73) and a cam portion (74). The wheel portion (73) and the cam portion (74) are integral parts and are staggered along the axis of the one-way clutch (79). The base circle diameter of the cam portion (74) is equal to the diameter of the wheel portion (73). The wheel portion (73) is coaxially connected to the axis of the one-way clutch (79), so that the slider (71) can rotate unidirectionally around the axis. When no external force is applied, the top of the cam portion (74) always faces downward. The inclined guide (75) includes an inclined surface (76) and a friction surface (78). The inclined surface (76) is used to contact the cam profile of the cam portion (74) to guide the slider (71) to move linearly. The friction surface (78) is horizontal and is used to contact the outer circumferential surface of the wheel portion (73) to guide the slider (71) to rotate. The height of the friction surface (78) is higher than the bottom edge of the inclined surface (76). When the inclined guide (75) approaches the slider (71), the one-way clutch (79) restricts the rotation of the slider (71) when the inclined surface (76) contacts the cam profile, and the slider (71) moves in a direction away from the valve housing (61); When the inclined guide (75) moves away from the slider (71), the slider (71) rotates so that the base circle of the cam contacts the inclined surface (76), and at the same time the wheel part (73) and the friction surface (78) contact each other. At this time, the oil hole (62) is closed by the one-way valve core (63). When the inclined guide (75) separates from the slider (71), the friction surface (78) drives the wheel (73) to continue rotating at least 180°, so that the slider (71) can continue to rotate under the action of inertia until it returns to the initial posture of the cam (74) with the top facing downward.

7. A fluid booster device according to claim 4 or 6, characterized in that, The second cylinder (2) is provided with a stop (23) inside, the stop (23) is fixedly connected to the second cylinder (2), and the stop (23) is located at the end of the stroke of the second piston (21) or the inclined guide (75).

8. The fluid booster device according to claim 1, characterized in that, The first cylinder (1) and the second cylinder (2) are coaxially fixedly connected, and the first piston (11) is coaxially fixedly connected to the second piston (21) through the piston rod (12).

9. A fluid booster device according to claim 1, characterized in that, The third check valve (6) is connected to the directional valve (3) via a throttle valve (31).

10. A fluid booster device according to claim 1, characterized in that, The first fluid is compressed air, the first fluid source is a gas cylinder containing compressed air, the first cylinder (1) is a cylinder, the gas cylinder is connected to a pressure gauge through a shut-off valve, the gas cylinder is connected to one end of the reversing valve (3) through another shut-off valve, and the other end of the reversing valve (3) is equipped with a silencer (32) and connected to the atmosphere. The second fluid is hydraulic oil, and the second cylinder (2) is an oil cylinder.

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