Boost output stabilization device

Abstract

A boost output stabilization device comprises: a first cylinder (12), wherein the first cylinder has a first chamber (24a) and a second chamber (24b) divided by a first piston (12b); a second cylinder (14), wherein the third chamber (26a) and a fourth chamber (26b) divided by a second piston (14b); and a piston rod (16), which connects the first piston and the second piston to each other, wherein the primary pressure of a boost device (70) is supplied to the first chamber, and the secondary pressure of the boost device is supplied to the fourth chamber, and the pressure fluid is taken out from the fourth chamber to the outside.

Description

Technical Field

[0001] The present invention relates to a boost output stabilization device combined with a fluid boost device. Background Art

[0002] Conventionally, there is known a supercharging device that supercharges air as a primary pressure supplied from a compressor and outputs the air as a predetermined secondary pressure.

[0003] As such a supercharging device, for example, Japanese Patent Publication No. 2018-084270 records a supercharging device in which a driving cylinder is arranged on both sides of the supercharging cylinder. As described in the document, the pressurized fluid output from the supercharging device is usually stored in an external box and supplied from the box to the fluid pressure device.

[0004] However, when the amount of fluid used by the fluid pressure device greatly exceeds the discharge flow of the booster, the pressure fluid stored in the box is consumed rapidly, and the pressure in the box drops significantly in a short period of time. Therefore, there is a concern that the fluid cannot be supplied to the fluid pressure device with sufficient pressure. In addition, in addition to the increase in the operating speed of the booster and the increase in the consumption of the pressure fluid, there is also a concern that the life of the booster will be reduced. Summary of the invention

[0005] The present invention is based on the above-mentioned circumstances, and an object of the present invention is to provide a supercharging output stabilization device capable of outputting the secondary pressure of a supercharging device in a stable state.

[0006] The boost output stabilization device involved in the present invention is connected to a boost device for a fluid of a secondary pressure specified for a primary pressure output, and comprises: a first cylinder body, the interior of which has a first chamber and a second chamber divided by a first piston; a second cylinder body, the interior of which has a third chamber and a fourth chamber divided by a second piston; and a piston rod, which connects the first piston and the second piston to each other, the primary pressure is supplied to the first chamber, the secondary pressure is supplied to the fourth chamber, and the pressure fluid is taken out from the fourth chamber to the outside.

[0007] According to the boost output stabilization device, the pressure fluid taken out from the fourth chamber of the second cylinder body to the outside is maintained at a pressure close to the secondary pressure set by the boost device, and can be output at a stable pressure. In addition, since the action speed of the boost device can be slowed down, the consumption of the pressure fluid can be reduced, and the life of the boost device can be extended.

[0008] The boost output stabilization device of the present invention has a structure in which a first piston and a second piston are connected, the primary pressure of the boost device acts on the first piston, and the secondary pressure of the boost device acts on the second piston. Since the pressure fluid is taken out to the outside from the chamber to which the secondary pressure is supplied, the secondary pressure of the boost device can be output in a stable state. In addition, since the action speed of the boost device is slowed down, the consumption of the pressure fluid is reduced, and the durability of the boost device is improved.

[0009] The above-mentioned objects, features and advantages can be easily understood from the following embodiments described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a diagram showing an example of a supercharging device combined with the supercharging output stabilizing device according to the present invention.

[0011] Figure 2 It is a plan view of the supercharging output stabilization device according to the first embodiment of the present invention.

[0012] Figure 3 yes Figure 2 A side view of a boost output stabilization device.

[0013] Figure 4 is along Figure 2 A cross-sectional view of the boost output stabilization device taken along line IV-IV.

[0014] Figure 5 is Figure 2 When the boost output stabilization device is in the specified operating position, Figure 4 The corresponding figure.

[0015] Figure 6 is Figure 2 When the boost output stabilization device is in other operating positions, Figure 4 The corresponding figure.

[0016] Figure 7 It means from Figure 2 A diagram showing the relationship between the flow rate and pressure of the fluid output by the boost output stabilization device.

[0017] Figure 8 It is a front view of a supercharging output stabilization device and a supercharging device according to a second embodiment of the present invention.

[0018] Fig. 9 It is a cross-sectional view taken along line IX-IX of the supercharging output stabilization device according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0019] Hereinafter, an example of a fluid boosting device combined with the boosting output stabilizing device according to the present invention will be described, and then the boosting output stabilizing device according to the present invention will be described by listing a plurality of preferred embodiments and referring to the accompanying drawings. In addition, the fluid used is a pressure fluid such as compressed air.

[0020] (Example of a booster device)

[0021] like Figure 1 As shown in the example, the fluid boosting device 70 combined with the boosting output stabilizing device according to the present invention comprises a center body 72, a pair of cylinders 74a and 74b arranged continuously on both sides of the center body 72, pistons 76a and 76b sliding in the cylinders 74a and 74b, and a rod 78 connecting the pistons 76a and 76b. The center body 72 is provided with an inlet port 80, an outlet port 82, and a discharge port 84, and the inlet port 80 is connected to a fluid supply source (compressor) not shown.

[0022] The cylinder bodies 74a, 74b are divided into inner boosting chambers 86a, 86b and outer drive chambers 88a, 88b by pistons 76a, 76b. The boosting chambers 86a, 86b are connected to the inlet port 80 via inlet check valves 90a, 90b provided on the center body 72, and are connected to the outlet port 82 via outlet check valves 92a, 92b. The drive chambers 88a, 88b are connected to a switching valve 94 provided on the center body 72, and push rods 96a, 96b for switching the switching valve 94 protrude into the boosting chambers 86a, 86b. In addition, the boosting device 70 is provided with a speed regulator 98 for adjusting the secondary pressure of the fluid at the outlet port 82.

[0023] When the piston 76a of the pressure boosting device 70 is moved to the driving chamber 88a on one side via the switching valve 94, the pressure fluid is supplied to the driving chamber 88a on the one side. Figure 1 When the piston 76a moves to the left, the pressure fluid in the boosting chamber 86a on one side is boosted and discharged from the outlet port 82 through the outlet check valve 92a. At this time, the pressure fluid in the drive chamber 88b on the other side is discharged from the discharge port 84 via the switching valve 94. And, when the piston 76a presses the push rod 96a near the end of the stroke, the switching valve 94 is switched to supply the pressure fluid to the drive chamber 88b on the other side.

[0024] As a result, the piston 76b moves to Figure 1The pressure fluid in the boosting chamber 86b on the other side is boosted and output from the outlet port 82 through the outlet check valve 92b. At this time, the pressure fluid in the drive chamber 88a on one side is discharged from the discharge port 84 via the switching valve 94. Then, when the piston 76b presses the push rod 96b near the end of the stroke, the switching valve 94 is switched to the state shown in the figure. The boosting device 70 repeats the above series of actions until the pressure of the fluid at the outlet port 82 reaches the set secondary pressure.

[0025] (First Embodiment)

[0026] Next, refer to Figure 2 to Figure 7 A supercharging output stabilization device 10 according to a first embodiment of the present invention will be described.

[0027] like Figure 4 As shown, the boost output stabilization device 10 is composed of a first cylinder 12 and a second cylinder 14 connected in series. The first cylinder 12 has a rectangular first cylinder tube 12a and a circular first piston 12b slidably disposed in a circular cylinder hole formed in the first cylinder tube 12a. The second cylinder 14 has a rectangular second cylinder tube 14a and a circular second piston 14b slidably disposed in a circular cylinder hole formed in the second cylinder tube 14a.

[0028] The first piston 12b is fixedly connected to one end of the piston rod 16 by the first nut 17a, and the second piston 14b is fixedly connected to the other end of the piston rod 16 by the second nut 17b. Therefore, the first piston 12b and the second piston 14b move integrally in the axial direction with the piston rod 16. The outer diameter of the first piston 12b is larger than the outer diameter of the second piston 14b.

[0029] A rectangular plate-shaped intermediate cover 18 is provided between the first cylinder tube 12a and the second cylinder tube 14a. A rectangular plate-shaped first end cover 20 is provided at the end of the first cylinder tube 12a on the side away from the intermediate cover 18, and a rectangular plate-shaped second end cover 22 is provided at the end of the second cylinder tube 14a on the side away from the intermediate cover 18. When the first piston 12b is located at a position abutting against the first end cover 20 (refer to Figure 5 ), the assembly consisting of the first piston 12b, the second piston 14b and the piston rod 16 (hereinafter referred to as the "piston assembly") can be at a position where the first piston 12b and the intermediate cover 18 abut (refer to Figure 6 )

[0030] The first cylinder tube 12a is clamped between the first end cover 20 and the intermediate cover 18 by inserting four bolts 23a from the first end cover 20 side and screwing them into the intermediate cover 18. The second cylinder tube 14a is clamped between the second end cover 22 and the intermediate cover 18 by inserting four bolts 23b from the second end cover 22 side and screwing them into the intermediate cover 18 (see Figure 3 ).

[0031] The cylinder bore of the first cylinder tube 12a is divided into a first chamber 24a on the first end cover 20 side and a second chamber 24b on the intermediate cover 18 side by the first piston 12b. The cylinder bore of the second cylinder tube 14a is divided into a third chamber 26a on the intermediate cover 18 side and a fourth chamber 26b on the second end cover 22 side by the second piston 14b.

[0032] like Figure 2 and Figure 4 As shown, a primary pressure supply port 28 connected to the above-mentioned fluid supply source is provided on one side of the first end cover 20. The pressure fluid from the fluid supply source is supplied to the inlet port 80 of the supercharging device 70 and is also supplied to the primary pressure supply port 28. Therefore, the pressure of the fluid supplied to the first chamber 24a of the first cylinder 12 via the primary pressure supply port 28 is the same as the pressure of the fluid supplied to the inlet port 80 of the supercharging device 70 (the primary pressure of the supercharging device 70).

[0033] A first breathing port 30 open to the atmosphere is provided on one side of the intermediate cover 18, and a second breathing port 32 open to the atmosphere is provided on the other side of the intermediate cover 18 opposite to the first side. The second chamber 24b of the first cylinder 12 is open to the atmosphere via the first breathing port 30, and the third chamber 26a of the second cylinder 14 is open to the atmosphere via the second breathing port 32.

[0034] A secondary pressure supply port 34 connected to the outlet port 82 of the supercharging device 70 through a pipe (not shown) is provided on one side of the second end cover 22. The pressure fluid output from the supercharging device 70 is supplied to the fourth chamber 26b of the second cylinder 14 via the secondary pressure supply port 34. The pressure of the fluid at the secondary pressure supply port 34 is the same as the pressure of the fluid at the outlet port 82 of the supercharging device 70 (the secondary pressure of the supercharging device 70). In addition, an output port 36 is provided on the side of the second end cover 22 opposite to the side where the secondary pressure supply port 34 is provided, and the pressure fluid of the fourth chamber 26b of the second cylinder 14 can be taken out to the outside from the output port 36 and supplied to the fluid pressure device (not shown).

[0035] The first end cover 20 is provided with a space 20a that allows the primary pressure supply port 28 to communicate with the first chamber 24a of the first cylinder 12 and can accommodate the first nut 17a. The second end cover 22 is provided with a space 22b that allows the secondary pressure supply port 34 and the output port 36 to communicate with the fourth chamber 26b of the second cylinder 14.

[0036] Here, the pressure of the first chamber 24a, that is, the primary pressure of the booster device 70 is set to P1, the pressure of the fourth chamber 26b when the force acting on the piston assembly is balanced is set to P2', and the secondary pressure set by the booster device 70 is set to P2. P2' can be obtained based on P1, the cross-sectional area of ​​the first piston 12b, and the cross-sectional area of ​​the second piston 14b.

[0037] In order to maintain the pressure of the fluid taken out from the fourth chamber 26b at a value close to the secondary pressure P2 set by the booster device 70, it is preferred that P2' is as close to P2 as possible. In addition, after the piston assembly moves to the point where the volume of the fourth chamber 26b becomes minimum, in order to restore the volume of the fourth chamber 26b, P2' needs to be less than P2.

[0038] The boost output stabilization device 10 according to the present embodiment is basically constructed as described above, and its function will be described below. The pressures in the first chamber 24a to the fourth chamber 26b are all equal to the atmospheric pressure, and the piston assembly is Figure 4 The state when the position shown is stationary is regarded as the initial state. In this initial state, the booster device 70 does not operate. In addition, the flow path (not shown) connecting the output port 36 and the fluid pressure device is closed by the electromagnetic valve (not shown).

[0039] From the above initial state, by switching the switching valve (not shown), the pressure fluid from the fluid supply source is supplied toward the supercharging device 70 and the supercharging output stabilization device 10. Thus, while the pressure fluid having the primary pressure P1 is supplied to the inlet port 80 of the supercharging device 70, the pressure fluid having the primary pressure P1 is also supplied to the primary pressure supply port 28 of the supercharging output stabilization device 10, and the pressure fluid is supplied from the primary pressure supply port 28 to the first chamber 24a of the first cylinder 12.

[0040] In addition, when the primary pressure is supplied to the inlet port 80 of the boosting device 70, the boosting device 70 starts to work, and the boosted pressure fluid is supplied from the outlet port 82 of the boosting device 70 toward the secondary pressure supply port 34 of the boost output stabilization device 10. When the boosting device 70 works for more than a constant time, the pressure of the fourth chamber 26b of the second cylinder 14 supplied with the pressure fluid via the secondary pressure supply port 34 reaches the secondary pressure P2 set by the boosting device 70, and the pressure P2' for maintaining the balance of the above-mentioned piston assembly rises. As a result, the piston assembly moves until the first piston 12b abuts against the first end cover 20, and the fourth chamber 26b of the second cylinder 14 stores the pressure fluid having the secondary pressure P2 set by the boosting device 70 (refer to Figure 5 ).

[0041] When the flow path connecting the output port 36 and the fluid pressure device is opened from the state where the pressure fluid having the secondary pressure P2 is stored in the fourth chamber 26b of the second cylinder 14, the pressure fluid stored in the fourth chamber 26b is supplied to the fluid pressure device from the output port 36. When the pressure fluid stored in the fourth chamber 26b is taken out from the output port 36, in order to maintain the balance of the force applied to the piston assembly, the first piston 12b moves away from the first end cover 20, and the piston assembly moves in the direction in which the second piston 14b approaches the second end cover 22.

[0042] As a result, the volume of the fourth chamber 26b is reduced and the pressure drop is suppressed. The pressure of the fourth chamber 26b is at least maintained not to be below P2′. When the pressure of the fourth chamber 26b is lower than the secondary pressure P2 set by the booster device 70, although the booster device 70 works, its movement speed is relatively slow. In this way, the piston assembly moves and the volume of the fourth chamber 26b is reduced, and while the pressure fluid with the secondary pressure P2 is supplemented to the fourth chamber 26b from the outlet port 82 of the booster device 70, the pressure fluid is taken out from the fourth chamber 26b, and the pressure fluid can be sent toward the fluid pressure device at a stable pressure.

[0043] When the use of the pressure fluid of the fluid pressure device stops while the first piston 12b is located at the middle position between the first end cover 20 and the intermediate cover 18, the piston assembly moves until the first piston 12b abuts against the first end cover 20 because the pressure fluid having the secondary pressure P2 is supplied from the outlet port 82 of the booster device 70 to the fourth chamber 26b. As a result, the volume of the fourth chamber 26b is restored to the maximum.

[0044] When the pressure fluid usage of the fluid pressure device continues to be extremely large and the pressure fluid stored in the fourth chamber 26b is rapidly consumed, the piston assembly moves until the first piston 12b abuts against the intermediate cover 18, so that the volume of the fourth chamber 26b becomes minimum (see Figure 6 In this case, although only the booster device 70 is actually working, if the usage amount of the pressure fluid in the fluid pressure device decreases or becomes zero, the volume of the fourth chamber 26b will be restored again.

[0045] Figure 7 This is a graph showing the relationship between the flow rate and pressure of the pressure fluid taken out of two supercharging devices of different sizes, respectively, when a supercharging output stabilization device is installed and when it is not installed. The horizontal axis represents the flow rate, and the vertical axis represents the pressure. The dots connected by a dotted line represent the case where a small supercharging device is used alone, and the dots connected by a solid line represent the case where a small supercharging device is combined with a supercharging output stabilization device. The dotted line connects the triangular points to represent the case where a medium-sized supercharging device is used alone, and the solid line connects the triangular points to represent the case where a medium-sized supercharging device is combined with a supercharging output stabilization device.

[0046] from Figure 7 It can be seen that when the boost output stabilization device is combined, the pressure drop when the flow rate increases is suppressed. In addition, even if it is a small boost device, if the boost output stabilization device is used together, it can also make the small boost device have the same capacity as a larger boost device.

[0047] According to the boost output stabilization device 10 involved in this embodiment, the first piston 12b and the second piston 14b are connected, and the primary pressure of the boost device 70 acts on the first piston 12b, and the secondary pressure of the boost device 70 acts on the second piston 14b. Since the pressure fluid is taken out to the outside from the fourth chamber 26b to which the secondary pressure is supplied, it can be output at a stable pressure close to the secondary pressure of the boost device 70. In addition, since the operation speed of the boost device 70 is slowed down, the amount of pressure fluid discharged from the discharge port 84 is reduced, so that the consumption of the pressure fluid is reduced, and the durability of the boost device 70 is improved.

[0048] (Second Embodiment)

[0049] Next, refer to Figure 8 and Fig. 9 The boost output stabilization device 40 according to the second embodiment of the present invention is described. In the second embodiment, the pressure fluid from the fluid supply source is supplied to the third chamber of the second cylinder in addition to the first chamber of the first cylinder. The second embodiment is also described as a device combined with the above-mentioned supercharging device 70 in the same manner as the first embodiment, but the supercharging device to be combined is not limited to the above-mentioned supercharging device 70.

[0050] The boost output stabilization device 40 is composed of a first cylinder 42 and a second cylinder 44 connected in series. The first cylinder 42 has a first cylinder tube 42a in a rectangular parallelepiped shape and a first piston 42b slidably disposed in a cylinder hole formed in the first cylinder tube 42a. The second cylinder 44 has a second cylinder tube 44a in a rectangular parallelepiped shape and a second piston 44b slidably disposed in a cylinder hole formed in the second cylinder tube 44a.

[0051] The first piston 42b is fixed to one end of the piston rod 46, and the second piston 44b is fixed to the other end of the piston rod 46. The first piston 42b and the second piston 44b move integrally in the axial direction with the piston rod 46. The outer diameter of the first piston 42b is the same as the outer diameter of the second piston 44b.

[0052] An intermediate cover 48 is provided between the first cylinder tube 42a and the second cylinder tube 44a. A first end cover 50 is provided at the end of the first cylinder tube 42a on the side away from the intermediate cover 48, and a second end cover 52 is provided at the end of the second cylinder tube 44a on the side away from the intermediate cover 48. The booster device 70 is mounted on the second end cover 52. The piston assembly composed of the first piston 42b, the second piston 44b and the piston rod 46 can move between a position where the first piston 42b abuts against the first end cover 50 and a position where the first piston 42b abuts against the intermediate cover 48.

[0053] The cylinder bore of the first cylinder tube 42a is divided into a first chamber 54a on the first end cover 50 side and a second chamber 54b on the intermediate cover 48 side by the first piston 42b. The cylinder bore of the second cylinder tube 44a is divided into a third chamber 56a on the intermediate cover 48 side and a fourth chamber 56b on the second end cover 52 side by the second piston 44b.

[0054] A primary pressure supply first port 58 connected to a fluid supply source is provided at the first end cover 50, and a primary pressure supply second port 60 connected to the fluid supply source is provided at the intermediate cover 48. The pressure fluid from the fluid supply source is supplied to the primary pressure supply first port 58 and the primary pressure supply second port 60 while being supplied to the inlet port 80 of the supercharging device 70. Therefore, the pressure of the fluid supplied to the first chamber 54a of the first cylinder 42 via the primary pressure supply first port 58 and the pressure of the fluid supplied to the third chamber 56a of the second cylinder 44 via the primary pressure supply second port 60 are the same as the pressure of the fluid supplied to the inlet port 80 of the supercharging device 70 (the primary pressure of the supercharging device 70).

[0055] A breathing port (not shown) open to the atmosphere is provided on the intermediate cover 48, and the second chamber 54b of the first cylinder body 42 is open to the atmosphere via the breathing port. A secondary pressure supply port 62 directly connected to the outlet port 82 of the supercharging device 70 is provided on the second end cover 52. The pressure fluid output from the supercharging device 70 is supplied to the fourth chamber 56b of the second cylinder body 44 via the secondary pressure supply port 62. The pressure of the fluid in the secondary pressure supply port 62 is the same as the pressure of the fluid in the outlet port 82 of the supercharging device 70 (the secondary pressure of the supercharging device 70). In addition, an output port 64 is provided on the second end cover 52, and the pressure fluid in the fourth chamber 56b of the second cylinder body 44 can be taken out from the output port 64 to the outside and supplied to the fluid pressure device not shown. In addition, the output port 64 is provided at a position away from the secondary pressure supply port 62.

[0056] Here, the pressure of the first chamber 54a and the third chamber 56a, that is, the primary pressure of the booster device 70 is set to P1, the pressure of the fourth chamber 56b when the force acting on the piston assembly is balanced is set to P2', and the secondary pressure set by the booster device 70 is set to P2. P2' can be obtained based on P1, the cross-sectional areas of the first piston 42b and the second piston 44b, and the cross-sectional area of ​​the piston rod 46.

[0057] In order to maintain the pressure of the fluid taken out from the fourth chamber 56b at a value close to the secondary pressure P2 set by the booster device 70, it is preferred that P2' is as close to P2 as possible. In addition, after the piston assembly moves to the point where the volume of the fourth chamber 56b becomes minimum, in order to restore the volume of the fourth chamber 56b, P2' needs to be less than P2.

[0058] The supercharged output stabilization device 40 according to the present embodiment is configured as described above, and its operation is the same as that of the supercharged output stabilization device 10 described above, so the description thereof will be omitted.

[0059] According to the boost output stabilization device 40 involved in this embodiment, since the primary pressure and the secondary pressure of the boost device 70 act on the piston assembly, and the pressure fluid is taken out to the outside from the fourth chamber 56b to which the secondary pressure is supplied, it is possible to output at a stable pressure close to the secondary pressure of the boost device 70. In addition, since the operation speed of the boost device 70 is slowed down, the amount of pressure fluid discharged from the discharge port 84 is reduced, so that the consumption of the pressure fluid is reduced, and the durability of the boost device 70 is improved.

[0060] The boost output stabilization device according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

Claims

1. A boost output stabilization device (10, 40) connected to a boost device (70) for outputting a fluid having a secondary pressure specified for a primary pressure, characterized in that: have: A first cylinder (12, 42), wherein the first chamber (24a, 54a) and the second chamber (24b, 54b) are divided by a first piston (12b, 42b); a second cylinder (14, 44), wherein the third chamber (26a, 56a) and the fourth chamber (26b, 56b) are divided by a second piston (14b, 44b); and a piston rod (16, 46), wherein the first piston and the second piston are connected to each other, the primary pressure is supplied to the first chamber, the secondary pressure is supplied to the fourth chamber, and the pressure fluid is taken out from the fourth chamber to the outside, The second chamber and the third chamber are open to the atmosphere and the outer diameter of the first piston is larger than the outer diameter of the second piston, or the primary pressure is supplied to the third chamber and the second chamber is open to the atmosphere.

2. The boost output stabilization device according to claim 1, characterized in that: The outer diameter of the second piston is the same as the outer diameter of the first piston.

3. The boost output stabilization device according to claim 1, wherein: The first cylinder includes a first cylinder tube (12a, 42a) and a first end cover (20, 50), and the second cylinder includes a second cylinder tube (14a, 44a) and a second end cover (22, 52), and the first cylinder tube and the second cylinder tube are connected to each other via an intermediate cover (18, 48).

4. The boost output stabilization device according to claim 3, characterized in that: The first end cover is provided with a primary pressure supply port (28) to which the primary pressure is supplied, and the second end cover is provided with a secondary pressure supply port (34) and an output port (36) to which the secondary pressure is supplied.

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