JP4844713B2 - Compressed air supply device - Google Patents

Description

  The present invention is suitable for each plug when both the normal pressure type plug and the second high pressure type plug higher than the high pressure zone or the first high pressure type and the second high pressure type plug of the normal pressure type and the high pressure zone are attached. The present invention relates to a compressed air supply device capable of supplying compressed air having a high pressure.

  As the use of high-pressure gas has been approved due to the revision of the High-Pressure Gas Control Law, the equipment used has gradually shifted to the high-pressure side. The reason is that if high-pressure compressed air can be used, high energy can be obtained even if the tool itself is compact, so that it is light and easy to handle, and it is necessary to fasten hard materials such as laminated SVL and LVL. This is because high energy is required. For this reason, the maximum operating pressure is specified as the maximum operating pressure of the second high pressure of 4 to 4.2 MPa in addition to the conventional normal pressure of less than 0.98 MPa and the first high pressure of 2.94 MPa or less. There is a hose and connected equipment attached to its tip. And from the convenience of the above-mentioned high pressure, it is predicted that such a tendency will further shift to less than 5 MPa in the future.

  On the other hand, in the past, dedicated connection devices have been used for each pressure zone. For example, a low pressure and high pressure coupler is attached to a common air compressor that is provided with a pressure reducing valve and can supply both normal pressure and high pressure compressed air, and the low pressure coupler has a low pressure plug. The nail driving machine having a high pressure plug is connected to the high pressure coupler. On the other hand, it is also known that a normal pressure plug and a high pressure plug can be connected to the same coupler.

Therefore, at present, the second high-pressure building compressor and the connecting device have not been realized. However, when this is realized, the second high-pressure compressor and the second high-pressure dedicated connecting device have not been realized. At the same time, it is necessary to be offered to the market. Then, in addition to the low pressure and the first high pressure, the second high pressure compressor and the connecting device are simultaneously put on the market.
JP 2003-90480 A

  However, if the second high-pressure compressor and the second high-pressure connection device are replaced at once for the second high-pressure, not only the manufacturer's manufacturing cost and the purchaser's expense will increase. Since those for normal pressure and the first high pressure are discarded all at once, it is not preferable in terms of environmental protection.

  The present inventors can use the conventional normal pressure and the first high-pressure plug by supplying two or three types of pressure to the second high-pressure compressed air supply device. Focused on.

  Therefore, the present invention solves the above problems and supplies predetermined compressed air to each of the normal pressure, the first high pressure plug, or any one of them and the second high pressure plug. It is an object of the present invention to provide a compressed air supply device that can perform the above.

In order to solve the above-mentioned problem, the invention according to claim 1 is such that a primary pressure side opening communicating with a compressed air supply source is provided on one side of a housing provided in the compressed air supply device main body, and a coupler for a connecting device is provided on the other side. A secondary pressure side opening is formed, a conduction space for compressed air is formed between both openings, and the adjustment cylinder is arranged to open to the primary pressure side opening, and is slidably disposed in the adjustment cylinder. One side of the adjustment piston has a pressing part that can push the first valve body provided in the primary pressure side opening and a pressure receiving surface that receives the compressed air in the conduction space, and the other side is a pressure regulating spring. By constantly urging the pressing portion in the pressing direction for pressing the first valve body, the adjustment piston is stopped at a position where the spring force of the pressure adjusting spring and the force against the pressure receiving surface are balanced, Secondary pressure side open Between the second valve body and the first valve body provided in part disposed operating rod, the operation rod when activated beyond a certain amount of movement in the opening direction the second valve body is first The valve body can be pressed in the opening direction, and the first high-pressure plug and the second high-pressure plug for higher pressure than the first high-pressure plug can be attached to the coupler. When the high-pressure plug is attached, the second valve body is pushed in at the tip of the first high-pressure plug within a range not exceeding the movement amount, and operates with the adjustment piston based on the balance of force against the adjustment piston. When the pressing portion opens and closes the first valve body to supply compressed air in the conduction space to the first high-pressure plug from the secondary opening, and the second high-pressure plug is mounted. The second valve at the tip of the second high pressure plug The is characterized in that so as to operate to open by pressing the operation rod is first valve body is pushed beyond the amount of movement.

In the invention according to claim 2, the primary pressure side opening that leads to the compressed air supply source is formed on one side of the housing provided in the compressed air supply device main body, and the secondary pressure side opening that leads to the coupler for connection device is formed on the other side. A compressed air conduction space is formed between the openings, and the adjustment cylinder is opened to the primary pressure side opening. The adjustment piston is slidably disposed in the adjustment cylinder. While having a pressing part which can push in the 1st valve body provided in the above-mentioned primary pressure side opening, and a pressure receiving surface which receives compressed air in the above-mentioned conduction space, the other side is always above the above-mentioned pressing part with a pressure regulation spring The first piston is urged in the pressing direction, and the adjustment piston is stopped at a position where the spring force of the pressure adjustment spring and the force against the pressure receiving surface are balanced, while the secondary pressure side opening is Second valve body provided and above Between the first valve body disposed operating rod, said operating rod is capable pressed in a direction to open the first valve body when the second valve member is operated beyond a certain amount of movement in the opening direction, A second adjusting cylinder is provided on the second valve body side of the adjusting cylinder, a second adjusting piston slidably provided on the second adjusting cylinder and the adjusting piston are connected via a connecting rod, and the operating rod And a seal member that seals the inner surface of the through hole at the bottom of the second adjustment cylinder is attached to the operating rod, and the second valve body is attached to the operating rod. Is operated to such an extent that the sealing member is removed, the compressed air in the conduction space is introduced between the second adjustment piston and the bottom from the through hole, The second valve body can be opened and closed. A movable sleeve is slidably provided, and a normal pressure plug, a high pressure plug, and an ultrahigh pressure plug can be mounted. The normal pressure plug and the movable sleeve are formed with protrusions that engage with each other. When the pressure plug is attached to the coupler, the normal pressure plug engages with the movable sleeve, and the second valve body does not disengage the operating rod from the seal member and does not exceed the certain amount of movement. And the pressing portion that operates together with the adjustment piston opens and closes the first valve body based on a balance between the force of the adjustment piston against the pressure receiving surface and the spring force of the pressure adjustment spring. When compressed air is supplied from the secondary opening to the normal pressure plug and the high pressure plug is attached to the coupler, the second valve body and the operating rod are pushed by the tip of the high pressure plug. When the second valve body is pushed in, the seal member comes off the seal with the through hole at the bottom of the second adjustment cylinder, and the push-in operation is performed to the extent that the fixed movement amount is exceeded. Compressed air is introduced from the through hole between the second adjustment piston and the bottom, and the sum of the pressure acting to move the second adjustment piston to the primary pressure side and the spring force of the pressure adjusting spring, and the above The adjustment piston opens and operates the first valve body due to the difference in force against the pressure receiving surface, so that high-pressure compressed air is supplied from the conduction space to the high-pressure plug, and the super-high-pressure plug is attached to the coupler. In this case, the second valve body is pushed beyond the amount of movement by the tip of the ultrahigh-pressure plug, and the first valve body is directly pressed by the operating rod so as to open. That.

  According to a third aspect of the present invention, instead of the connecting rod, a projecting shaft is provided on the second adjusting piston, the projecting shaft is projected into the adjusting cylinder, and a spring receiver is formed at the tip of the projecting shaft. The pressing portion is constantly urged in the pressing direction by a pressure adjusting spring disposed between the receiver and the adjusting piston.

According to the first aspect of the present invention, when the first high pressure plug is attached, the second valve body is pushed in within a range that does not exceed a certain amount of movement, so that the operating rod presses and opens the first valve body. Although the second valve body is not opened, the compressed air in the conduction space is supplied from the plug, and the pressure in the conduction space is reduced. For this reason, since the force on the pressure receiving surface of the adjustment piston becomes relatively small with respect to the pressure adjustment spring, the adjustment piston moves to the primary pressure side by the spring force, and the pressing portion pushes in and opens the first valve body, and in the conduction space. When the primary pressure is supplied to the cylinder and the pressure is increased and exceeds a predetermined normal pressure or the first high pressure, the pressure on the adjustment piston prevails and the first valve body is closed again. In this way, the compressed air is supplied.

  On the other hand, when the second high pressure plug is attached, the second valve body operates over a certain amount of movement, so that the operating rod directly pushes the first valve body, and the primary pressure passes through the conduction space. Supplied to the second high-pressure plug.

According to the invention of claim 2, when the normal pressure plug is mounted, the normal pressure plug engages with the movable sleeve so that the second valve body does not release the operating rod and the seal member does not come off. push to the extent that does not exceed a certain amount of movement, based on the balance between the spring force of the force and the pressure control spring against the pressure receiving surface of the adjusting piston, the pressing unit operating with adjusting piston opening and closing the first valve body As a result, the compressed air in the conduction space is supplied from the secondary side opening to the normal pressure plug. In addition, when the high pressure plug is attached, the second valve body is pushed to the extent that the seal member is released and the fixed movement amount is not exceeded, so that the compressed air in the conduction space is second adjusted. It introduce | transduces between a 2nd adjustment piston and the said bottom part from the through-hole of the bottom part of a cylinder. For this reason, since the pressure of the compressed air in the conduction space acts on the second adjustment piston, the second adjustment piston moves to the primary pressure side and presses the adjustment piston via the connecting rod. Since the pressure from the second adjustment piston and the spring force of the pressure adjusting spring act on the adjustment piston on the side opposite to the pressure receiving surface, when the first valve body is opened, this corresponds to this in the conduction space. compressed air high pressure flows were, which is supplied to the high pressure plug.

When the ultra high pressure plug is mounted , the second valve body is pushed beyond the moving amount at the tip of the ultra high pressure plug, and the first valve body is directly pressed by the operating rod to open and operate. Ultra high pressure compressed air is supplied to the ultra high pressure plug.

Therefore, when mounting the atmospheric pressure plug and high-pressure plug and the ultra-high pressure plug in the same coupler can be supplied with compressed air corresponding to each.

According to the invention of claim 3, when the high pressure plug is attached, the pressure of the compressed air in the conduction space acts on the second adjustment piston, so that the projecting shaft moves to the primary pressure side together with the second adjustment piston. since deflecting the piston such pressure control spring on the side opposite to the pressure receiving surface of the spring force is increased, the high pressure of the compressed air corresponding to the increased spring force may be supplied to the high-pressure plug. When the ultra high pressure plug is attached, the same as in the second aspect.

  Here, for convenience, the first high pressure in the high pressure zone will be described as high pressure, and the second high pressure in the higher pressure zone will be described as ultra high pressure.

  FIG. 1 shows a compressed air supply device which can be connected to a high pressure plug and an ultrahigh pressure plug and can supply compressed air corresponding to each plug. In FIG. 1, reference numeral 1 denotes a compressed air supply device main body. The housing provided in is shown. The housing 1 includes a housing 1a provided directly on the apparatus main body and a coupler housing 1b coupled to the housing 1a. A primary pressure side opening 2 is formed on one side of the housing 1, and a secondary pressure side opening 3 leading to a coupler for connecting to a connection device is formed on the other side.

  An adjustment cylinder 4 is disposed between the openings 2 and 3, and a compressed air conduction space S is formed around the adjustment cylinder 4. The adjusting cylinder 4 has a bottomed cylindrical shape, and one end opens to the primary pressure side opening 2, and the opposite side is closed by the bottom 5.

  Next, a first valve body 6 is disposed in the primary pressure side opening 2 of the housing 1, and a second valve body 7 is disposed in the secondary pressure side opening 3. The first valve body 6 is biased by a spring 8 so as to close the primary pressure side opening 2. A cylindrical stem 10 is slidably disposed in the secondary pressure side opening 3 and is engaged with the second valve body 7.

  An adjustment piston 11 is slidably disposed in the adjustment cylinder 4. One side of the adjustment piston 11 is formed in a conical shape, and a pressing portion 12 capable of pressing the first valve body 6 provided in the primary pressure side opening 2 is provided at the tip thereof. The one side surface 13 is a pressure receiving surface that receives the compressed air in the conduction space S. A through hole 14 is formed in the center of the adjustment piston 11.

  A pressure adjustment spring 15 is disposed between the other side of the adjustment piston 11 and the bottom 5 of the adjustment cylinder 4, and the adjustment piston 11 is always pressed by the pressure portion 12 by the pressure adjustment spring 15. It is biased in the pressing direction.

  Next, an operating rod 16 is provided between the first valve body 6 and the second valve body 7. The operating rod 16 passes through the central through hole 14 of the adjustment piston 11, a flange portion 18 is formed in the middle, and a pressing spring 20 is provided between the flange portion 18 and the adjustment piston 11. The operating rod 16 and the through hole 21 at the bottom of the adjustment cylinder 4 are sealed by a seal ring 22.

  The adjustment piston 11, the first valve body 6, the second valve body 7, the cylindrical stem 10, and the operating rod 16 are arranged coaxially. The operating rod 16 is urged by the presser spring 20 so that the second valve body 7 closes the secondary pressure side opening 3. When the second valve body 7 is operated over a certain amount of movement against the presser spring 20, the tip of the operating rod 16 is engaged with the first valve body 6, and further, the first valve body 6 is pushed out to the primary pressure side. Open the opening 2.

  In the above configuration, in the initial state (the state in which the plug is not attached), the adjustment piston 11 is pressed by the pressure adjusting spring 15 and the pressing portion 12 pushes the first valve body 6, so that the conduction space from the primary pressure side opening 2. Compressed air is supplied into S, acts on the pressure receiving surface 13 of the adjustment piston 11, and pushes back the adjustment piston 11 against the pressure adjustment spring 15. In this way, the adjustment piston 11 stops at a position where the pressure adjusting spring 15 force of the pressure adjusting spring 15 and the force (product of pressure receiving area and pressure) on the pressure receiving surface 13 are balanced. For this reason, the spring constant of the pressure adjusting spring 15 is set to correspond to a predetermined high pressure.

  Next, a coupler 9 is provided in the secondary pressure side opening. The coupler 9 includes a short cylinder portion 24 having a seal ring 23, a movable sleeve 26 having a protrusion 25 on the inner surface, a cylinder portion 30 having a hole 28 into which a lock ball 27 can be dropped, and a lock ball 27. A cylindrical body 31 that is locked or unlocked is provided.

  The coupler 9 can be fitted with a high-pressure plug 33 and an ultrahigh-pressure plug 34. The high-pressure plug 33 and the ultra-high-pressure plug 34 are different in that the length from the receiving groove 35 that receives the ball 27 to the tip is longer in the latter length than the former length.

  Therefore, an operation mode when the high-pressure plug 33 and the ultrahigh-pressure plug 34 are attached to the coupler 9 of the compressed air supply device will be described.

  First, as shown in FIG. 1, when the high-pressure plug 33 is inserted into the coupler 9, the annular projecting surface 37 at the tip of the large-diameter portion 36 of the plug 33 is first engaged with the projecting portion 25 of the movable sleeve 26. , The hole 28 of the cylindrical portion 30 is opened, the ball 27 is dropped into the hole 28 of the cylindrical portion by the movable sleeve 26, the plug 33 is further pressed, and the ball 27 is inserted into the receiving groove 35 of the large diameter portion 36. When engaged, the plug 33 cannot be pushed any further. At the same time, the cylindrical body 31 is pushed out by the spring 38 and covers the ball 27, so that the engaged state by the ball 27 is locked. At this time, the seal ring 23 of the coupler 9 comes into contact with the outer peripheral surface of the short cylinder portion 24 of the plug 33 to be sealed, and the tip of the plug 33 pushes the stem 10 of the coupler 9 against the presser spring 20 to The two-valve body 7 is opened and operated.

  When the plug 3 is removed from the coupler 9, the cylindrical body 31 is moved to the primary pressure side against the spring 38, and the plug 33 may be extracted.

  Thus, the second valve body 7 opens and the operating rod 16 moves accordingly, but the amount of movement is not sufficient to push out the first valve body 6. At this time, the compressed air in the conduction space S is supplied to the high-pressure plug 33 through the cylindrical stem 10. When supplied, the pressure in the conduction space S is reduced, so that the force acting on the pressure receiving surface 13 of the adjustment piston 11 is reduced, the spring force of the pressure adjustment spring 15 is relatively increased, and the adjustment piston 11 is 1 The valve body 6 is pushed out and opened. As a result, compressed air having a primary pressure is supplied into the conduction space S. When the pressure in the conduction space S increases, the working pressure of the adjustment piston 11 against the pressure receiving surface 13 increases and moves against the spring force of the pressure adjusting spring 15, so the first valve body 6 is closed. In this way, high-pressure compressed air set by the spring force of the pressure adjusting spring 15 is supplied from the primary pressure side opening 2 to the conduction space S and discharged from the secondary pressure side opening 3.

  Next, when the ultrahigh-pressure plug 34 is inserted into the coupler 9, as shown in FIG. 2, the plug 34 is locked in the same manner as described above. In this case, the length of the tip of the plug 34 is longer than that of the high-pressure plug 33. Because of this, the pushing amount of the second valve body 7 is also large. For this reason, the amount of movement of the operating rod 16 also exceeds a certain amount of movement necessary to push in the first valve body 6. Therefore, the tip of the operating rod 16 directly pushes out the first valve body 6 to open the primary pressure side opening 2, and the ultra high pressure primary pressure is directly supplied to the ultra high pressure plug 34 through the conduction space S.

  As described above, when the high-pressure plug 33 and the ultrahigh-pressure plug are attached, predetermined compressed air can be supplied to each.

  3 (a) and 3 (b) show a coupler configuration in which a normal pressure plug and an ultrahigh pressure plug can be mounted. The coupler 9 has the same basic configuration as the coupler 9 of FIG. The cylindrical portion 24 is movable along the axial direction, is urged in the protruding direction by a spring 41, and the short cylindrical portion 24 is engageable with a protruding portion 42 formed on the outer surface of the cylindrical stem 10 on the inner surface. The difference is that the protrusion 43 formed on the outer surface is provided and the cylindrical stem 10 is long. Of course, the pressure in the conduction space S of the compressed air supply device in this case is set to be a normal pressure by reducing the spring force of the pressure adjusting spring 15. The coupler 9 may be coupled to the housing 1a provided in the apparatus main body in the same manner as in FIG.

  In the above configuration, when the normal pressure plug 32 is mounted as shown in FIG. 5A, the tip of the plug 32 pushes the short cylindrical portion 24 and engages the protrusions to push the stem 10, and the second While opening the valve body 7, the operating rod 16 is also moved. The amount of movement of the operating rod 16 at this time is the same as the amount of movement when the high-pressure plug 33 shown in FIG. 1 is attached. 3B, when the ultra-high pressure plug 34 is mounted, the stem 10 is pushed directly at the tip of the plug as described above, and the operating rod 16 together with the second valve body 7 as described above. Move. This amount of movement is also set so as to exceed a certain amount of movement necessary to push in the first valve body 6.

  Therefore, according to the above configuration, when the normal pressure plug 32 and the ultrahigh pressure plug 34 are attached to the same coupler 9, compressed air of a predetermined pressure can be supplied to each.

Next, FIG. 4 to FIG. 7 show an example of an embodiment in which a normal pressure plug, a high pressure plug, and an ultrahigh pressure plug are attached and predetermined compressed air can be supplied to each. The same members as those in the above-described embodiment are denoted by the same reference numerals.

  In this embodiment, further, a second adjustment cylinder 44 is provided on the second valve body 7 side of the adjustment cylinder 4. A second adjustment piston 45 is slidably accommodated in the second adjustment cylinder 44. The second adjustment piston 45 and the adjustment piston 11 are connected via a connecting rod 46.

  The operating rod 16 penetrates the second adjusting cylinder 44, and the operating rod 16 has a through hole 48 formed in the bottom 47 of the second adjusting cylinder 44 and a through hole 49 at the center of the second adjusting piston 45. Seal rings 50 and 51 are attached as seal members for sealing. The seal ring 51 of the second adjustment piston 45 is not sealed with the through hole 49 of the second adjustment piston 45 in the initial state. When the second valve body 7 moves the operating rod 16 to such an extent that the seal ring 50 is removed, the seal is removed and the compressed air in the conduction space S passes from the through hole 48 to the second adjustment cylinder 44. It is set to be introduced between the bottom 47 and the second adjustment piston 45.

  In this case, since the air pressure equal to the pressure in the conduction space S acts on the surface of the second adjustment piston 45, the second adjustment piston 45 moves to the primary pressure side, and at the same time, the adjustment piston 11 via the connecting rod 46. Is also moved in the same direction. The adjustment piston 11 is subjected to the spring force of the pressure adjustment spring 15 in the adjustment cylinder 4 and the force applied to the second adjustment piston 45. Accordingly, the first valve body 6 is opened, and high-pressure compressed air is supplied from the primary pressure side opening 2. The second valve body 7 continues to open until the supply pressure becomes high enough to correspond to the sum of the force of the pressure adjusting spring 15 and the force from the second adjustment piston 45. When the supply pressure exceeds a predetermined high pressure, the pressure receiving surface 13 of the adjustment piston 11 is reached. The force acting on the first valve body 6 closes.

  Thus, the pressure in the conduction space S can be set to a high pressure by the sum of the spring force of the pressure adjusting spring 15 and the force acting on the second adjustment piston 45, and the first valve body 6 is opened. Can be set to ultra-high pressure.

  Corresponding to the configuration of the compressed air supply device, the coupler 9 can also be fitted with a normal pressure plug 32, a high pressure plug 33, and an ultrahigh pressure plug 34. Such a coupler 9 has the same configuration as that shown in FIGS. The amount of movement of the second valve element 7 and the operating rod 16 when the above three types of plugs are attached is the smallest when the normal pressure plug is attached (to the extent that the seal ring 50 does not come off). When the plug 33 is attached, the amount of movement is large (to the extent that the seal ring 50 is detached), and the amount of movement is the largest when the ultrahigh pressure plug 34 is attached. 6 is set to be pushed in.

  Therefore, an operation mode when the plugs are mounted on the compressed air supply device will be described.

First, as shown in FIG. 5, when mounting the normal pressure plug 32, the second valve body 7 opens, but since the seal ring 50 is not disengaged, as in the case shown in FIG. 3 (a), pressure regulating Normal pressure compressed air corresponding to the spring force of the spring 15 is supplied.

  Next, when the high-pressure plug 33 is attached, as shown in FIG. 6, the seal ring 50 of the operating rod 16 that moves together with the second valve body 7 is detached from the through hole 48 of the bottom 47 of the second adjustment cylinder 44 ( At this time, another seal ring 51 seals the through hole 49 of the second adjustment piston 45), so that the compressed air in the conduction space S enters from the through hole 48 of the bottom 47 of the second adjustment cylinder 44. For this reason, the pressure of the compressed air acts on the surface (pressure receiving surface 52) of the second adjustment piston 45 and presses and moves the adjustment piston 11 together with the pressure adjustment spring 15 to the primary pressure side. High pressure compressed air corresponding to the sum of the spring force and the force acting on the second adjustment piston 45 is supplied from the conduction space S to the high pressure plug 33.

  Further, as shown in FIG. 7, when the ultra-high pressure plug 34 is attached, the movement amount of the second valve body 7 and the operating rod 16 is large, so that the operating rod 16 directly pushes the first valve body 6. For this reason, the compressed air of the primary pressure is directly supplied to the plug 34.

  Therefore, according to the configuration of the compressed air supply device, when the normal-pressure plug, the high-pressure plug 33, and the ultrahigh-pressure plug 34 are mounted on the same coupler 9, compressed air having a predetermined pressure is supplied to each. Can do.

  In the above-described embodiment, the second adjustment piston 45 and the adjustment piston 11 are directly connected via the connection rod 46. However, instead of this configuration, as shown in FIG. The projecting shaft 53 is provided integrally with the adjustment piston 45, the projecting shaft 53 is projected into the adjustment cylinder 4, and a spring receiver 54 is formed at the tip of the projecting shaft 53, and between the spring receiver 54 and the adjustment piston 11. Alternatively, the pressure adjusting spring 15 may be arranged.

  Further, the second adjustment piston 45 and the projecting shaft 53 may be configured separately.

  In this case, when the high pressure plug (33) is attached, the seal ring 50 is detached as shown in the figure, and the compressed air enters the second adjustment cylinder 44 from the conduction space S, and the pressure receiving surface of the second adjustment piston 45 is shown. By acting on 52 and moving the second adjustment piston 45 to the primary pressure side, the pressure adjusting spring 15 is bent, so that the force of the pressure adjusting spring 15 is also increased. For this reason, since the spring force with respect to the adjustment piston 11 also increases, the pressure of the compressed air supplied into the conduction space S when the first valve body 6 is opened increases, and can be set to a required high pressure.

  As shown in FIG. 9, the pressure adjusting spring 15 is a double spring consisting of a strong pressure adjusting spring 15a and a weak pressure adjusting spring 15b so that the total spring force is the same as that of the pressure adjusting spring 15 shown in FIG. It is preferable that the spring constant of the strong pressure adjusting spring 15a is made low and the weak pressure adjusting spring 15b is in an unloaded state in the initial state. The reason is that the opening / closing sensitivity of the first valve body 6 is improved and the accuracy of pressure adjustment is improved. This is because if the spring constant is high, the sensitivity of the first valve body 6 is poor and the flow rate of the compressed air from the primary pressure side opening 2 tends to be reduced.

1 is a cross-sectional view showing an embodiment when a high-pressure plug is attached to a compressed air supply device according to the present invention. It is sectional drawing which shows one Embodiment at the time of mounting | wearing with the plug for ultra high pressures in the said compressed air supply apparatus. (A) (b) is sectional drawing which shows the form of the coupler which can mount | wear with the normal pressure plug and the ultrahigh pressure plug. FIG. 3 is a cross-sectional view showing an embodiment of a compressed air supply device to which plugs for normal pressure, high pressure, and ultrahigh pressure can be attached. It is sectional drawing which shows one Embodiment at the time of attaching the plug for normal pressure to the said compressed air supply apparatus. FIG. 3 is a cross-sectional view showing an embodiment when a high-pressure plug is attached to the compressed air supply device. It is sectional drawing which shows one Embodiment at the time of mounting | wearing with the plug for ultra high pressures in the said compressed air supply apparatus. It is sectional drawing of the principal part of other embodiment of the said compressed air supply apparatus. It is sectional drawing of the principal part of other embodiment of the said compressed air supply apparatus.

2 Primary pressure side opening 3 Secondary pressure side opening 4 Adjustment cylinder 6 First valve body 7 Second valve body 15 Pressure adjusting spring 16 Actuating rod 11 Adjustment piston 10 Stem 9 Coupler 32 Normal pressure plug 33 High pressure plug 34 Super high pressure plug

Claims (3)

A primary pressure side opening that leads to the compressed air supply source is formed on one side of the housing provided in the compressed air supply device body, and a secondary pressure side opening that leads to the coupler for the connected device is formed on the other side. An air conduction space is formed, and the adjustment cylinder is disposed to open to the primary pressure side opening, and one side of the adjustment piston that is slidably disposed in the adjustment cylinder is provided in the primary pressure side opening. A pressing direction in which the first valve body can be pushed in and a pressure receiving surface that receives the compressed air in the conduction space, and the other side is always pressed by the pressure regulating spring into the first valve body. The adjustment piston is stopped at a position where the spring force of the pressure adjusting spring and the force against the pressure receiving surface are balanced, while the second valve body provided in the secondary pressure side opening and the above Between the first valve body The rod was placed, together with the operation rod when activated beyond a certain amount of movement in the opening direction the second valve body to enable pressed in a direction to open the first valve body,
The coupler can be fitted with a first high-pressure plug and a second high-pressure plug for higher pressure than the first high-pressure plug,
When the first high-pressure plug is attached, the second valve body is pushed in at the tip of the first high-pressure plug within a range not exceeding the movement amount, and together with the adjustment piston based on the balance of force against the adjustment piston The operating pressing portion opens and closes the first valve body to supply compressed air in the conduction space from the secondary side opening to the first high-pressure plug ,
When the second high-pressure plug is mounted, the second valve body is pushed beyond the amount of movement by the tip of the second high-pressure plug, and the operating rod presses the first valve body to open. A compressed air supply device characterized in that: A primary pressure side opening that leads to the compressed air supply source is formed on one side of the housing provided in the compressed air supply device body, and a secondary pressure side opening that leads to the coupler for the connected device is formed on the other side. An air conduction space is formed, and the adjustment cylinder is disposed to open to the primary pressure side opening, and one side of the adjustment piston that is slidably disposed in the adjustment cylinder is provided in the primary pressure side opening. A pressing direction in which the first valve body can be pushed in and a pressure receiving surface that receives the compressed air in the conduction space, and the other side is always pressed by the pressure regulating spring into the first valve body. The adjustment piston is stopped at a position where the spring force of the pressure adjusting spring and the force against the pressure receiving surface are balanced, while the second valve body provided in the secondary pressure side opening and the above Between the first valve body The rod is arranged, the actuating rod is capable pressed in a direction to open the first valve body when activated beyond a certain amount of movement in the opening direction the second valve body,
A second adjusting cylinder is provided on the second valve body side of the adjusting cylinder, a second adjusting piston slidably provided on the second adjusting cylinder and the adjusting piston are connected via a connecting rod, and the operating rod And a seal member that seals the inner surface of the through hole at the bottom of the second adjustment cylinder is attached to the operating rod.
When the second valve body operates the operating rod to such an extent that the seal member is removed, compressed air in the conduction space is introduced between the second adjustment piston and the bottom portion from the through hole. While
The coupler is slidably provided with a movable sleeve that can open and close the second valve body, and can be fitted with a normal pressure plug, a high pressure plug, and an ultrahigh pressure plug. The sleeve is formed with protrusions that engage each other,
When the normal pressure plug is attached to the coupler, the normal pressure plug engages with the movable sleeve so that the second valve body does not disengage the operating rod and the seal member does not come off, and the predetermined amount of movement is exceeded. The conducting space is opened by opening and closing the first valve body based on the balance between the force of the adjusting piston against the pressure receiving surface and the spring force of the pressure adjusting spring based on the balance between the adjusting piston and the spring force of the pressure adjusting spring. The compressed air inside is supplied to the normal pressure plug from the secondary side opening,
When the high pressure plug is attached to the coupler, the second valve body and the operating rod are pushed in at the tip of the high pressure plug, and the second valve body is pushed in so that the seal member is moved to the bottom of the second adjustment cylinder. Compressed air in the conduction space is introduced between the second adjustment piston and the bottom portion from the through hole by being pushed to the extent that the seal with the through hole is removed and exceeds the certain amount of movement. The adjustment piston opens and operates the first valve body by the difference between the sum of the pressure acting to move the second adjustment piston to the primary pressure side and the spring force of the pressure adjusting spring and the force on the pressure receiving surface. High pressure compressed air is supplied from the conduction space to the high pressure plug,
When the ultrahigh-pressure plug is attached to the coupler, the second valve body is pushed beyond the amount of movement by the tip of the ultrahigh-pressure plug, and the first valve body is pressed directly by the operating rod. A compressed air supply device characterized in that it opens and operates.   Instead of the connecting rod, a projecting shaft is provided on the second adjusting piston, the projecting shaft is projected into the adjusting cylinder, and a spring receiver is formed at the tip of the projecting shaft. Between the spring receiver and the adjusting piston, The compressed air supply device according to claim 2, wherein the pressing portion is constantly urged in the pressing direction by a pressure adjusting spring disposed in the pressure chamber.

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