Patent Description:
For example, in order to remove cutting chips adhering to a surface of a workpiece during machining and clean the surface of the workpiece, a device that blows high-pressure fluid such as high-pressure air against the surface is used.

<CIT> discloses an intermittent air blow gun used for such applications. In this intermittent air blow gun, when the operator grips the switch lever, the on-off valve of the air discharge channel is opened, and air from the compressed air source is discharged from the nozzle. At the same time, a portion of the air flowing through the air discharge channel is supplied to the pilot valve, and when the pilot valve opens, a portion of the air from the compressed air source is sent to the secondary side of the on-off valve through the bypass channel, and the on-off valve closes.

<CIT> discloses an air pulsar that generates pulse air intermittently from continuously supplied compressed air. The body of this air pulsar is separated into an air supply chamber and an air discharge chamber by a diaphragm including a small hole. An air injection cylinder opened/closed by the diaphragm is provided inside the air supply chamber. Further, the air discharge chamber is separated into a first chamber and a second chamber by a magnetic valve plate including a valve hole. A valve plug into which a permanent magnet is embedded is provided inside the second chamber. Once compressed air is supplied to an air inlet of the body, the compressed air flows from the air supply chamber through the small hole of the diaphragm into the first chamber of the air discharge chamber, so that the valve plug is retracted and the valve hole is opened. In this way, after flowing into the second chamber rom the first chamber, the compressed air is discharged to the outside from the air outlet. As the compressed air is discharged, the pressure inside the air discharge chamber decreases and the diaphragm deforms to expand toward the discharge chamber, so that the compressed air inside the air supply chamber is injected to the outside from the air injection cylinder. On the other hand, as the pressure inside the air discharge chamber decreases, the valve plug progresses to block the valve hole by adhesion between the permanent magnet and the valve plate. Then, the pressure inside the first chamber increases to that the diaphragm blocks the air injection cylinder again and the injection of compressed air is interrupted.

<CIT> discloses a filter backwash means which is suitable for removing debris restrained at a meshed filter and make the filter usable again. The filter backwash means includes a diaphragm valve arranged between an inlet conduit and an outlet conduit, and a dump control pilot valve configured to control communication/interruption between a diaphragm space defined by the diaphragm valve and the outlet conduit. The diaphragm space communicates with the inlet conduit via a hole passing through the center of the diaphragm valve. The pilot valve is actuated by the pressure difference between an inlet pressure one and an outlet pressure zone. The pressure at the inlet pressure zone is the same as the pressure at an inlet pipe of the filter and the pressure at the outlet pressure zone is the same as the pressure at an outlet pipe of the filter. Therefore, if debris are restrained at the filter, the pilot valve is actuated.

<CIT> discloses a flow rate control valve including a main valve for opening and closing a flow path, a diaphragm connected to the main valve, a pilot valve for controlling the fluid applying pressure to the diaphragm and the like.

<CIT> discloses a servo valve including a valve plug for opening and closing a valve seat arranged between an inlet and an outlet, a control chamber connected to the inlet through an orifice and a pilot valve for releasing pressure caused by the orifice.

<CIT> discloses a filling stop valve of automatic cut off of flow of liquid when the liquid reaches a desired level in a container.

However, in order to discharge air by such an air blow gun, it is necessary for the operator to grip the lever and operate the air blow gun at a work site. For example, when the air blow gun needs to be operated at a place where water droplets are scattered, there is a problem that the operator gets wet.

The present invention has been made in consideration the above situation, and an object of the present invention is to provide a high-pressure fluid discharge device which is capable of intermittently discharging a high-pressure fluid without the need of an operator directly and manually operating the device.

This problem is solved by a high-pressure fluid discharge device according to claim <NUM>. Preferred embodiments of the invention are evident from the dependent claims.

A high-pressure fluid discharge device according to the present invention includes an inlet port to which a high-pressure fluid is supplied, a tank chamber that stores the high-pressure fluid, and a discharge port that discharges the high-pressure fluid. The high-pressure fluid discharge device further includes a diaphragm valve that separates a pilot chamber and a valve chamber communicating with the tank chamber. The pilot chamber communicates with the valve chamber through a pilot passage. When the diaphragm valve opens, the valve chamber communicates with the discharge port through a discharge passage. An opening and closing control valve is provided in a release flow path that opens the pilot chamber to the discharge passage. The opening and closing control valve is operated to open and close by a pressure of the fluid supplied from the tank chamber.

According to the above-described high-pressure fluid discharge device, fluid having a high peak pressure can be periodically discharged from the discharge port merely by supplying a high-pressure fluid from the inlet port.

The high-pressure fluid discharge device according to the present invention includes a diaphragm valve that separates a pilot chamber and a valve chamber communicating with the tank chamber. An opening and closing control valve that opens the pilot chamber to the discharge passage is operated to open and close by a pressure of the fluid supplied from the tank chamber. Therefore, a fluid having a high peak pressure can be periodically discharged merely by supplying the high-pressure fluid from the inlet port.

A high-pressure fluid discharge device of the present invention will be described below with reference to the accompanying drawings, while giving several suitable embodiments. In the following description, the terms "up", "down", "left", and "right" refer to directions in the drawings for the sake of convenience, and do not limit the actual arrangement of devices or the like.

A high-pressure fluid discharge device <NUM> according to a first embodiment of the present invention will be described with reference to <FIG>. As shown in <FIG> and <FIG>, the high-pressure fluid discharge device <NUM> includes a tank housing <NUM> having a tank chamber <NUM> therein, a diaphragm housing <NUM> having a diaphragm valve <NUM> therein, and a control housing <NUM> having an opening and closing control valve <NUM> therein. The high-pressure fluid discharge device <NUM> is used for removing cutting chips or the like.

The tank housing <NUM> includes a quadrangular tubular cylinder tube <NUM>, a cylindrical inlet cover <NUM>, and a disk-shaped end cover <NUM>. The inlet cover <NUM> is attached to one end side of the cylinder tube <NUM> via a C-ring 30a, and includes an inlet port <NUM> penetrating in the axial direction. The end cover <NUM> is attached to the other end side of the cylinder tube <NUM> via a C-ring 30b, and closes the other end side of the cylinder tube <NUM>.

The tank chamber <NUM> that stores high-pressure air (high-pressure fluid) supplied from the inlet port <NUM> is formed inside the cylinder tube <NUM>. A seal member 34a for sealing between the inlet cover <NUM> and the cylinder tube <NUM> is attached to the outer peripheral surface of the inlet cover <NUM>. A seal member 34b for sealing between the end cover <NUM> and the cylinder tube <NUM> is attached to the outer peripheral surface of the end cover <NUM>.

As shown in <FIG>, the upper side wall of the cylinder tube <NUM> is provided with a pedestal portion <NUM> projecting upward. The pedestal portion <NUM> extends parallel to the axis of the cylinder tube <NUM>. A discharge air supply port <NUM> penetrates through the upper side wall of the cylinder tube <NUM>, and opens at the top of the pedestal portion <NUM>. Further, an operating air supply port <NUM> for supplying air toward the opening and closing control valve <NUM> described later penetrates through the upper side wall of the cylinder tube <NUM>. The operating air supply port <NUM> opens in a circular recess 36a formed in the top of the pedestal portion <NUM>.

A connecting plate <NUM> for mounting the diaphragm housing <NUM> and the control housing <NUM> is arranged on an upper portion of the cylinder tube <NUM>. The lower surface of the connecting plate <NUM> is provided with a recessed groove <NUM> matching the cross-sectional shape of the pedestal portion <NUM> of the cylinder tube <NUM>. In a state where the pedestal portion <NUM> of the cylinder tube <NUM> is fitted into the recessed groove <NUM> of the connecting plate <NUM>, the connecting plate <NUM> is fixed to the pedestal portion <NUM> by a plurality of first bolts <NUM>.

The connecting plate <NUM> has a first hole <NUM> penetrating in the vertical direction at a position corresponding to the discharge air supply port <NUM> of the tank housing <NUM>. The first hole <NUM> includes a lower passage forming portion 48a having a diameter equal to that of the discharge air supply port <NUM> and an upper fitting portion 48b having a diameter larger than that of the passage forming portion 48a. Further, the connecting plate <NUM> has a second hole <NUM> penetrating in the vertical direction at a position corresponding to the operating air supply port <NUM>.

As shown in <FIG>, the diaphragm housing <NUM> is formed by combining a first body <NUM> and a second body <NUM>. The first body <NUM> and the second body <NUM> are butted against each other by fitting an annular convex portion 52a provided on the outer peripheral side of the right side surface of the first body <NUM> into an annular concave portion 54a provided on the outer peripheral side of the left side surface of the second body <NUM>.

The diaphragm valve <NUM> has a thick main body portion 16a having a cylindrical shape and a flange 16b that is thinner than the main body portion 16a and is flexible. An outer peripheral edge portion of the flange 16b is sandwiched between the first body <NUM> and the second body <NUM>.

The first body <NUM> has an annular valve chamber <NUM> defined by the diaphragm valve <NUM>. The second body <NUM> has a pilot chamber <NUM> defined by the diaphragm valve <NUM>. The interior of the main body portion 16a of the diaphragm valve <NUM> is provided with a pilot passage 16c for allowing the pilot chamber <NUM> to communicate with the valve chamber <NUM>. One end of the pilot passage 16c opens at a side surface of the main body portion 16a that faces the valve chamber <NUM>. The other end of the pilot passage 16c opens at an end surface of the main body portion 16a facing the pilot chamber <NUM>.

The bottom surface of the first body <NUM> is provided with an annular projecting portion 52b projecting downward at a position corresponding to the discharge air supply port <NUM> of the tank housing <NUM>. The bottom portion of the first body <NUM> including the projecting portion 52b has a connection passage <NUM> for connecting the discharge air supply port <NUM> to the valve chamber <NUM>. The projecting portion 52b of the first body <NUM> is fitted into the fitting portion 48b of the first hole <NUM> of the connecting plate <NUM>. The discharge air supply port <NUM> communicates with the valve chamber <NUM> via the passage forming portion 48a of the first hole <NUM> of the connecting plate <NUM> and the connection passage <NUM> of the first body <NUM>. Reference numeral 34c denotes a seal member for sealing between the projecting portion 52b and the fitting portion 48b.

The first body <NUM> has a discharge port <NUM> opened on a side surface opposite to a side surface butted against the second body <NUM>, and a discharge passage <NUM> communicating with the discharge port <NUM> and extending to the vicinity of the diaphragm valve <NUM>. The first body <NUM> includes therein a tubular wall portion 52c that separates the valve chamber <NUM> and the discharge passage <NUM>. The distal end of the tubular wall portion 52c constitutes a valve seat 52d. When the main body portion 16a of the diaphragm valve <NUM> is not in contact with the valve seat 52d, the discharge passage <NUM> communicates with the valve chamber <NUM>. When the main body portion 16a of the diaphragm valve <NUM> is in contact with the valve seat 52d, communication between the discharge passage <NUM> and the valve chamber <NUM> is blocked.

The control housing <NUM> has a first release flow path 64a and a second release flow path 64b. The first release flow path 64a and the second release flow path 64b form a part of a flow path for releasing the air in the pilot chamber <NUM> toward the discharge passage <NUM>. One end of the first release flow path 64a opens at a side surface of the control housing <NUM> that faces the diaphragm housing <NUM>, and the one end is connected to an extension passage 58a extending from the pilot chamber <NUM>. The other end of the first release flow path 64a is connected to the opening and closing control valve <NUM>. Reference numeral 34d denotes a seal member for sealing a connection portion between the first release flow path 64a and the extension passage 58a from the outside.

The diaphragm housing <NUM> has a third release flow path 64c and a fourth release flow path 64d. The third release flow path 64c and the fourth release flow path 64d constitute the remaining portions of the flow path for releasing the air in the pilot chamber <NUM> toward the discharge passage <NUM>. The third release flow path 64c is formed in the second body <NUM>, and the fourth release flow path 64d is formed in the first body <NUM>. One end of the fourth release flow path 64d is connected to the third release flow path 64c, and the other end of the fourth release flow path 64d is connected to the discharge passage <NUM>.

One end of the second release flow path 64b formed in the control housing <NUM> is connected to the opening and closing control valve <NUM>. The other end of the second release flow path 64b opens at the side surface of the control housing <NUM> facing the diaphragm housing <NUM> and is connected to the third release flow path 64c formed in the second body <NUM>.

The opening and closing control valve <NUM> includes a spool <NUM> slidable between a position where the second release flow path 64b is connected to the first release flow path 64a and a position where the second release flow path 64b is blocked from the first release flow path 64a. The spool <NUM> receives the urging force of a spring <NUM> in one direction and receives the urging force of the air pressure of a second operating air flow path 70b described later in the opposite direction. The first release flow path 64a is always connected to a recess 66a formed in the outer peripheral surface of the spool <NUM>.

When the air pressure in the second operating air flow path 70b is less than a predetermined value, the spool <NUM> moves to the position where the second release flow path 64b is blocked from the first release flow path 64a, by the biasing force of the spring <NUM> (see <FIG>). At this time, the air in the pilot chamber <NUM> is confined. On the other hand, when the air pressure in the second operating air flow path 70b is equal to or higher than the predetermined value, the spool <NUM> moves, against the urging force of the spring <NUM>, to the position where the second release flow path 64b is connected to the first release flow path 64a (see <FIG>). At this time, the air in the pilot chamber <NUM> is released toward the discharge passage <NUM>.

The control housing <NUM> has an operating air flow path with a speed controller <NUM> being installed in the path. The operating air flow path includes a first operating air flow path 70a located upstream of the speed controller <NUM> and the second operating air flow path 70b located downstream of the speed controller <NUM>. The first operating air flow path 70a opens in a circular recess 22a formed in the bottom of the control housing <NUM>. The second operating air flow path 70b is connected to the opening and closing control valve <NUM>.

A cylindrical sleeve <NUM> is inserted into the second hole <NUM> of the connecting plate <NUM>. The sleeve <NUM> is supported between the circular recess 22a formed in the control housing <NUM> and the circular recess 36a formed in the pedestal portion <NUM> of the cylinder tube <NUM>. The operating air supply port <NUM> of the cylinder tube <NUM> communicates with the first operating air flow path 70a via a passage formed inside the sleeve <NUM>. On the outer periphery of the sleeve <NUM>, a seal member 34e abutting against the wall surface of the circular recess 22a of the control housing <NUM> and a seal member 34f abutting against the wall surface of the circular recess 36a of the pedestal portion <NUM> of the cylinder tube <NUM> are mounted.

The speed controller <NUM> is a variable flow rate control valve capable of adjusting the flow rate of air flowing through the operating air flow path. The flow rate of air passing through the speed controller <NUM> can be adjusted by operating a knob 74a of the speed controller <NUM> to thereby set a needle 74b provided inside the speed controller <NUM>, to a desired position. The flow rate of the air passing through the speed controller <NUM> determines the rising speed of the pressure of the air in the second operating air flow path 70b acting on the spool <NUM> of the opening and closing control valve <NUM> when the air pressure in the tank chamber <NUM> rises.

The first body <NUM>, the second body <NUM>, and the control housing <NUM> are connected in series by a plurality of second bolts <NUM>. The first body <NUM> is connected to the connecting plate <NUM> by a plurality of third bolts <NUM>. As a result, the diaphragm housing <NUM> constituted by the first body <NUM> and the second body <NUM> and the control housing <NUM> are integrally connected to the connecting plate <NUM>. Reference numeral <NUM> denotes a cover body that covers the diaphragm housing <NUM>.

The high-pressure fluid discharge device <NUM> according to the first embodiment of the present invention is basically configured as described above. Hereinafter, the operation will be described with reference to <FIG>.

As shown in <FIG> and <FIG>, a state in which the main body portion 16a of the diaphragm valve <NUM> abuts against the valve seat 52d and the spool <NUM> of the opening and closing control valve <NUM> is at a position at which the second release flow path 64b is blocked from the first release flow path 64a is referred to as an initial state. That is, a state in which both the diaphragm valve <NUM> and the opening and closing control valve <NUM> are closed is defined as an initial state. At this time, although the high-pressure air is not sufficiently stored in the tank chamber <NUM>, the pressure of the air in the valve chamber <NUM> and the pilot chamber <NUM> communicating with each other via the pilot passage 16c is higher than the pressure of the air in the discharge passage <NUM>.

When the high-pressure air is supplied to the tank chamber <NUM> through the inlet port <NUM> from the initial state, the pressure of the air in the tank chamber <NUM> increases. Part of the air enters the valve chamber <NUM> through the discharge air supply port <NUM>, the passage forming portion 48a of the first hole <NUM> of the connecting plate <NUM>, and the connection passage <NUM> of the first body <NUM>, and then enters the pilot chamber <NUM> through the pilot passage 16c. Therefore, the pressure of the air in the valve chamber <NUM> and the pilot chamber <NUM> continues to be higher than the pressure of the air in the discharge passage <NUM>, and the diaphragm valve <NUM> is kept closed.

Another part of the air in the tank chamber <NUM> flows toward the speed controller <NUM> through the operating air supply port <NUM>, the inside of the sleeve <NUM>, and the first operating air flow path 70a. Here, the flow rate of the air passing through the speed controller <NUM>, that is, the flow rate of the air flowing into the second operating air flow path 70b is limited to a flow rate corresponding to the position of the needle 74b of the speed controller <NUM>. Therefore, the pressure of the air in the second operating air flow path 70b acting on the opening and closing control valve <NUM> increases at a speed corresponding to the limited flow rate.

When the pressure of the air in the second operating air flow path 70b becomes equal to or higher than a predetermined value, the spool <NUM> of the opening and closing control valve <NUM> moves against the urging force of the spring <NUM>, and the second release flow path 64b is connected to the first release flow path 64a. That is, the opening and closing control valve <NUM> is opened (see <FIG>). Thus, the air in the pilot chamber <NUM> sequentially flows through the first release flow path 64a to the fourth release flow path 64d and reaches the discharge passage <NUM>.

When the air in the pilot chamber <NUM> is released, the pressure of the air in the pilot chamber <NUM> decreases, and the main body portion 16a of the diaphragm valve <NUM> separates from the valve seat 52d. That is, the diaphragm valve <NUM> opens (see <FIG>). Then, the air supplied to and stored in the tank chamber <NUM> through the inlet port <NUM> enters the valve chamber <NUM> through the discharge air supply port <NUM>, the passage forming portion 48a of the first hole <NUM> of the connecting plate <NUM>, and the connection passage <NUM> of the first body <NUM>. Thereafter, the air flows into the discharge passage <NUM> at once and is discharged from the discharge port <NUM> to the outside.

When the air stored in the tank chamber <NUM> is discharged to the outside, the pressure of the air in the tank chamber <NUM> decreases, and the pressure of the air in the second operating air flow path 70b acting on the spool <NUM> of the opening and closing control valve <NUM> also decreases. When a predetermined amount of air stored in the tank chamber <NUM> is discharged, the pressure of the air in the second operating air flow path 70b becomes lower than the predetermined value. As a result, the spool <NUM> is moved by the urging force of the spring <NUM>, and the second release flow path 64b is blocked from the first release flow path 64a. That is, the opening and closing control valve <NUM> is closed.

When the opening and closing control valve <NUM> is closed, the releasing of the air in the pilot chamber <NUM> is stopped. Further, since the air from the valve chamber <NUM> flows into the pilot chamber <NUM> via the pilot passage 16c, the pressure of the air in the pilot chamber <NUM> increases. On the other hand, since the air in the valve chamber <NUM> and the discharge passage <NUM> that communicate with each other is discharged from the discharge port <NUM> to the outside, the pressure of the air in the pilot chamber <NUM> becomes higher than the pressure of the air in the valve chamber <NUM> and the discharge passage <NUM>. As a result, the main body portion 16a of the diaphragm valve <NUM> comes into contact with the valve seat 52d, and the diaphragm valve <NUM> is closed. Therefore, the discharge of air from the discharge port <NUM> is stopped, and the state returns to the initial state.

While the high-pressure air is supplied to the tank chamber <NUM> through the inlet port <NUM>, the above-described operations are repeatedly performed. That is, a series of operations of "opening the opening and closing control valve <NUM>" → "opening the diaphragm valve <NUM>" → "discharging the air stored in the tank chamber <NUM> to the outside from the discharge port <NUM>" → "closing the opening and closing control valve <NUM>" → "closing the diaphragm valve <NUM>" → "stopping the discharge of the air from the discharge port <NUM>" are periodically repeated.

<FIG> shows how the air pressure in the tank chamber <NUM> and the air pressure in the discharge port <NUM> change when the above-described series of operations are periodically repeated. The pressure of the air in the tank chamber <NUM> is indicated by a one dot chain line, and the pressure of the air in the discharge port <NUM> is indicated by a solid line. For comparison with a case where the normal continuous air blow is performed, the discharge pressure in the continuous air blow is indicated by a dotted line.

When the air pressure in the tank chamber <NUM> rises and reaches a predetermined value P1, the air pressure in the discharge port <NUM> instantaneously rises to a high peak value (peak pressure) P2, and then the air pressure in the discharge port <NUM> and the air pressure in the tank chamber <NUM> drop. This operation is periodically repeated.

The period in this case depends on the air flow rate set by the speed controller <NUM>. Specifically, when the position of the needle 74b is changed by operating the knob 74a of the speed controller <NUM> and the flow path area around the needle 74b is reduced, the period becomes longer. The peak pressure P2 at the discharge port <NUM> depends on the strength of the spring <NUM> of the opening and closing control valve <NUM>. The stronger the spring <NUM> (the greater the spring constant), the greater the peak pressure P2.

By the intermittent air blow having a high peak pressure P2, cutting chips can be effectively removed from the surfaces of the workpieces, and the consumption amount of air is remarkably small as compared with the continuous air blow.

According to the high-pressure fluid discharge device <NUM> of the present embodiment, air having a high peak pressure P2 can be periodically discharged from the discharge port <NUM> merely by continuously supplying high-pressure fluid through the inlet port <NUM>.

In the present embodiment, high-pressure air is used as the high-pressure fluid. However, the fluid to be used is not limited to air and may be another fluid as long as it is a compressible fluid. In addition, although the speed controller is provided in the present embodiment, the speed controller need not necessarily be provided when it is not necessary to adjust the period.

Next, a high-pressure fluid discharge device <NUM> according to a second embodiment of the present invention will be described with reference to <FIG> and <FIG>. In the high-pressure fluid discharge device <NUM> according to the second embodiment, the same or equivalent components as those of the high-pressure fluid discharge device <NUM> described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

The high-pressure fluid discharge device <NUM> is attached to a spindle <NUM> of a machining center, and is used to remove chips adhering to the surface of the workpiece. For reference, <FIG> shows a state in which an end mill (tool) <NUM> is mounted on the spindle <NUM> of the machining center via a tool holder <NUM>.

As shown in <FIG>, the high-pressure fluid discharge device <NUM> includes a hollow conical tool holder <NUM> in which a tank chamber <NUM> is formed, the diaphragm housing <NUM> incorporating the diaphragm valve <NUM>, and the control housing <NUM> incorporating the opening and closing control valve <NUM>.

The tool holder <NUM> is one of a plurality of tool holders which are attached to the spindle <NUM> of the machining center. In other words, the high-pressure fluid discharge device <NUM> includes, as a part of the configuration, an empty tool holder from among a plurality of tool holders used for mounting a tool such as an end mill in a machining center, and uses the internal space thereof as the tank chamber <NUM>.

As shown in <FIG>, the tool holder <NUM> includes an inlet port 94a on one end side in the axial direction thereof. A plate-shaped cover plate <NUM> that forms a wall surface of the tank chamber <NUM> together with an inner wall surface of the tool holder <NUM> is attached to the other end side of the tool holder <NUM> in the axial direction. A seal member <NUM> for sealing the tank chamber <NUM> from the outside is attached to an end surface of the tool holder <NUM> that contacts the cover plate <NUM>.

The cover plate <NUM> has a discharge air supply port 96a and an operating air supply port 96b, which penetrate through a wall surface thereof. The diaphragm housing <NUM> and the control housing <NUM> are mounted on a surface of the cover plate <NUM> opposite to a surface against which the tool holder <NUM> abuts.

On the right side surface of the first body <NUM> constituting a part of the diaphragm housing <NUM>, an annular projecting portion 52b projecting rightward is provided at a position corresponding to the discharge air supply port 96a of the cover plate <NUM>. The projecting portion 52b is fitted to the cover plate <NUM>. The discharge air supply port 96a communicates with the valve chamber <NUM> via a connection passage <NUM> provided in the right side surface portion of the first body <NUM> including the projecting portion 52b.

A sleeve <NUM> is disposed between the control housing <NUM> and the cover plate <NUM> at a position corresponding to the operating air supply port 96b of the cover plate <NUM>. The operating air supply port 96b of the cover plate <NUM> communicates with the first operating air flow path 70a of the control housing <NUM> via a passage inside the sleeve <NUM>.

The first body <NUM> has a discharge port <NUM> opened on the left side surface of the first body <NUM> and a discharge passage <NUM> communicating with the discharge port <NUM> and extending to the vicinity of the diaphragm valve <NUM>. The discharge port <NUM> and the discharge passage <NUM> extend parallel to the axial direction of the tool holder <NUM>.

The control housing <NUM> includes a first release flow path 64a and a second release flow path 64b as flow paths for releasing the air in the pilot chamber <NUM> toward the discharge passage <NUM>. The diaphragm housing <NUM> includes a third release flow path 64c and a fourth release flow path 64d. The third release flow path 64c and the fourth release flow path 64d are arranged in one straight line and extend in a direction perpendicular to the discharge passage <NUM>.

Also in the high-pressure fluid discharge device <NUM> of the present embodiment, as in the previously-described high-pressure fluid discharge device <NUM>, while high-pressure air is supplied to the tank chamber <NUM> through the inlet port 94a, a series of operations of "opening of the opening and closing control valve <NUM>" → "opening of the diaphragm valve <NUM>" → "discharge of air stored in the tank chamber <NUM> to the outside from the discharge port <NUM>" → "closing of the opening and closing control valve <NUM>" → "closing of the diaphragm valve <NUM>" → "stopping of discharge of air from the discharge port <NUM>" are periodically repeated. By periodically discharging air having a high pressure peak value from the discharge port <NUM>, chips adhering to the surface of a workpiece (not shown) that is positioned in front of the discharge port <NUM> are effectively removed.

Claim 1:
A high-pressure fluid discharge device (<NUM>, <NUM>) comprising an inlet port (<NUM>, 94a) to which a high-pressure fluid is supplied, and a discharge port (<NUM>) configured to discharge the high-pressure fluid wherein
the high-pressure fluid discharge device further comprises a tank chamber (<NUM>, <NUM>) configured to store the high-pressure fluid, a pilot chamber (<NUM>), a valve chamber (<NUM>) and a diaphragm valve (<NUM>) configured tc separate the pilot chamber (<NUM>) from the valve chamber (<NUM>) communicating with the tank chamber (<NUM>, <NUM>); wherein
the pilot chamber (<NUM>) communicates with the valve chamber (<NUM>) through a pilot passage (16c); wherein
when the diaphragm valve (<NUM>) opens, the valve chamber (<NUM>) communicates with the discharge port (<NUM>) through a discharge passage (<NUM>);
the high-pressure fluid discharge device further comprising an opening and closing control valve (<NUM>) which is provided in a release flow path (64a to 64d) configured to open the pilot chamber (<NUM>) to the discharge passage (<NUM>); wherein
the opening and closing control valve is operated to open and close by a pressure of the fluid supplied from the tank chamber (<NUM>, <NUM>).