JP2010156463A - Poppet valve with poppet position detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a poppet valve with a poppet position detecting device, maintaining control valve performance, enhancing position accuracy, preventing decline in position detection performance, easily handled, and directly detecting the position of a poppet. <P>SOLUTION: Separately from movement and positioning means of a needle valve 70, a flange part 79 is provided in the needle valve 70. The poppet valve is provided with: a ring 3a in which the flange part 79 enters and leaves inner holes of a solenoid guide 72 and a spacer 88; a contactor 4a on which either one of the ring 3a and the flange part 79 is made to abut; and a spring 12a for energizing the ring 3a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control valve with a detection device that can directly detect the position of a poppet of a control valve (spool type directional control valve, spool type proportional control valve, poppet type directional control valve) used in industrial machinery, construction machinery, etc. The present invention relates to a poppet valve with a poppet position detection device that can directly detect a position of a predetermined poppet.

FIG. 7 shows the structure of an oil-immersed solenoid valve having the most common spool valve. The oil-immersed solenoid valve 51 includes a main body 53 having an axial hole 53a having a plurality of fluid passages, for example, four fluid passages, and a fluid passage which is inserted into the axial hole 53a and switched by axial movement. The spool 52 and electromagnetic coils 30a and 30b for moving the spool 52 to the left and right are provided, and connectors 54a and 54b for connecting the electrical terminals of the electromagnetic coils 30a and 30b to the outside are connected.
Steps 52a and 52b are provided on both sides of the spool 52. The rods 55a and 55b are provided so that the end portions 2c and 2d of the spool 52 are in contact with each other. The rods 55a and 55b are integrated with a movable iron core (not shown). And inserted so as to be movable in the axial direction along the solenoid guides 11a and 11b. The solenoid guides 11a and 11b are fixed to the main body 53 in a state where they are screwed into screws 53c and 53c provided in end holes of the axial hole 53a and sealed by an O-ring 56.

The opposite side of the insertion hole (guide hole) of the solenoid guides 11a and 11b into which the rods 55a and 55b and the movable iron core (not shown) are inserted is sealed, and the space between the body 53 and the solenoid guides 11a and 11b is sealed. Thus, the pressure in the axial hole 53a of the main body 53 can be kept high, which is a so-called oil-immersed solenoid valve.
Electromagnetic coils 30a and 30b are fitted into the solenoid guides 11a and 11b and fixed with nuts 34. By energizing the electromagnetic coils 30a, 30b, the movable iron core is moved, and the spool 52 is urged in the pressing direction by the rods 55a, 55b. Ring-shaped stoppers 57 a and 57 b having hollow holes provided concentrically with the spool 52 are provided at both end portions of the main body 53.

The outer contact surfaces 58a and 58b of the stoppers 57a and 57b have either one of the stepped portions 52a and 52b of the spool 52, or a hollow hole concentric with the spool 52 that can be contacted simultaneously and moved in the axial direction. Ring-shaped retainers 59a and 59b having the above are provided.
Springs 32a and 32b are provided between the retainers 59a and 59b and the solenoid guides 11a and 11b. The retainers 59a and 59b are urged in the axial direction toward the main body 53 by the elastic force of the springs 32a and 32b. Has been.
The distance between the contact surfaces 58a, 58b with which the retainers 59a, 59b abut and the distance between the stepped parts 52a, 52b on both sides of the spool 52 are ensured to be approximately the same size, and when the electromagnetic coils 30a, 30b are de-energized, the spool 52 Is held at an intermediate position by springs 32a and 32b and retainers 59a and 59b.

As a result, the spool 52 is maintained in a neutral position when not energized. When the right electromagnetic coil 30b is energized in the drawing, the rod 55b pushes the spool 52, and the spool 52 moves to the left by pushing the left retainer 59a and the spring 32a. Then, the fluid passage is switched.
At this time, the retainer 59b on the right side remains in contact with the contact surface 58b (stopper 57b). In the figure, when the left electromagnetic coil 30a is energized, the rod 55a pushes the spool 52, and the spool 52 pushes the right retainer 59b and the spring 32b to move to the right to switch the fluid passage. In this case, the left retainer 59a remains in contact with the contact surface 58a (stopper 57a).

On the other hand, some of the connectors 54a and 54b of the electromagnetic valve 51 are equipped with indicator lights (not shown) assembled in parallel to the electromagnetic coils 30a and 30b. This indicator light is turned on when a voltage is applied across the electromagnetic coils 30a and 30b.
However, this light does not indicate that the spool 52 is surely moving with the excitation of the electromagnetic coils 30a and 30b. For example, even if a voltage is applied to both ends of the electromagnetic coils 30a and 30b, the light turns on even when the electromagnetic coils 30a and 30b are disconnected and the spool 52 does not move.
Further, in the oil-immersed solenoid valve, the spool 52 is placed in a sealed pressure-resistant space, and the main body 53, the spool 52, the solenoid guides 11a and 11b, the retainers 59a and 59b, the springs 32a and 32b, and the like need strength. For this reason, the position of the spool 52 cannot be detected electrically because metal is used and is electrically connected.

Further, there is a case where it is desired to detect the position of the spool 52 not in the neutral state but in the middle of the switching or when the switching is completed. Furthermore, the neutral position is not provided by the stoppers 57a and 57b and the retainers 59a and 59b, and the spool 52 is moved to the third position by making the magnetic force of the electromagnetic coils 30a and 30b proportionally controlled by only the balance of the springs 32a and 32b. Even in the case of a proportional control valve that moves proportionally without being moved, it may be desired to detect the position of the spool 52.
In this case, various detection positions are assumed.
Therefore, in Patent Document 1, the position of the spool is detected from the outside of the sealed pressure resistant space using a differential transformer. In Patent Document 2, the position of the spool and poppet in the sealed pressure resistant space is detected using a magnetic sensor.

On the other hand, a conventional poppet valve (not shown) includes two fluid passages, and the two fluid passages are communicated or blocked by the poppet so that the pressure fluid from the supply port passes or is blocked. It has a function. When it is desired to detect the operation of communication or blocking between the two fluid passages in the poppet valve, it is only necessary to check the presence or absence of fluid flow in the valve body, so a flow meter may be installed either before or after the poppet valve. However, installing a flow meter is a problem because it directly leads to an increase in the cost of the apparatus.
Therefore, a structure for detecting the position of the poppet assembled in the poppet valve body has been devised as a method for detecting the communication and blocking state between the two fluid passages.
That is, Patent Document 3 discloses detecting the position of a poppet using a differential transformer.

JP-A-10-177918 JP 2002-89742 A JP-A-6-173907

However, the differential transformer type as shown in Patent Document 1 and Patent Document 3 has a complicated valve structure. Since a differential transformer and a dedicated electric circuit (amplifier) are required, it becomes expensive. Moreover, before use, it is necessary to adjust the position of the core which is a differential transformer or a detection body. Furthermore, there has been a problem that the detection position of the detection body changes (a phenomenon called temperature drift occurs) due to temperature changes of the differential transformer and the electric circuit (amplifier).
Further, in the magnetic sensor type as shown in Patent Document 2, the valve structure is complicated. Since a magnetic sensor is required, it is expensive. Before use, it is necessary to adjust the position of the magnet which is a magnetic sensor or a detection body. There are similar problems such as a change in the detection position of the detection body (a phenomenon called temperature drift occurs) due to a temperature change of the magnetic sensor.
Moreover, there is a difference between the position of the detection body where the magnetic sensor is turned on and the position of the detection body where the magnetic sensor is turned off (there is hysteresis). Furthermore, both of them have a problem that the sensitivity is poor because the spool in the sealed pressure resistant space is detected from the outside.

  The present invention has been made in view of the above-described problems, and does not use expensive sensors and electric circuits. Simple structure and excellent durability. It is not necessary to adjust the position of the sensor and the detection body in the pre-use stage. Unlike magnetic sensors, the detection positions at ON and OFF are the same (no hysteresis). Provided are a control valve with a poppet position detection device capable of directly detecting the position of a poppet having a feature such that the detection position of a detection body does not change due to a change in temperature (no temperature drift), an electromagnetic valve, and an electromagnetic proportional valve That is. Another object is to provide a sensor structure that can directly detect the position of the poppet even when a high back pressure is applied to the tank line, such as an oil-immersed solenoid valve. Furthermore, it is to provide a sensor structure that can be easily assembled.

Therefore, in the invention according to claim 1,
A first axial hole that forms first and second fluid passages and is connected to the first fluid passage and is coaxially connected to the first fluid passage and connected to the second fluid passage. A body having a second axial hole and a third axial hole communicating with the second axial hole;
A sleeve having an outer peripheral surface of a cylindrical portion fitted in the first axial hole and a flange portion fitted in a third axial hole and having a large-diameter inner peripheral surface and an inner peripheral surface inward;
A poppet that has a large-diameter portion inserted into the large-diameter inner peripheral surface of the sleeve and a small-diameter portion inserted into the inner peripheral surface of the sleeve, and opens and closes the first and second fluid passages in the axial direction;
Means for moving or positioning the poppet;
A control valve with
The means for moving or positioning the poppet is
When the poppet is inserted into the sleeve, the first inner diameter is formed by the inner diameter surface of the sleeve, the larger diameter portion and the smaller diameter portion of the poppet, and the inner diameter surface of the sleeve and the small diameter portion. And a second fluid chamber;
A hole formed in the axial direction of the central portion of the sleeve for communicating the large diameter inner peripheral surface side and the inner peripheral surface side of the sleeve divided by the poppet;
A needle valve in which a conical portion that engages with the hole of the sleeve is provided at a distal end portion of a small diameter portion that is connected to a plunger and integrated with the large diameter portion;
A flange provided at a connection portion between the large diameter portion and the small diameter portion of the needle valve;
A ring provided concentrically with the needle valve so as to be able to enter and exit the large diameter portion of the needle valve and not to interfere with the needle valve;
Either the outer side end surface of the ring or the collar part or the collar part can be moved in the axial direction so as to be able to contact at the same time, and provided so as not to interfere with the needle valve except the collar part concentrically with the needle valve. A ring contact,
A first spring that biases the contact against the flange or the ring;
A second spring that urges the needle valve to engage the conical portion of the needle valve with the hole of the sleeve;
When the contact and the outer side end surface of the ring abut, a gap provided between the end surface of the flange and the outer side wall surface of the ring,
With
The contact is electrically connected to an electrical terminal having electrical conductivity and electrically connectable to the outside, and the ring is electrically connected to a detection electrical terminal different from the electrical terminal, When the outer side wall surface of the ring and the contact are in contact with each other by the spring of 1, the electrical terminal and the detection electrical terminal are conducted through the ring, and the conical portion of the needle valve is connected to the poppet. When the hole is closed by closing the hole and detecting the blocking of the first and second fluid passages, the outer side wall surface of the ring is separated from the contactor. At least the ring and the electrical terminal do not conduct electricity, the conical portion of the needle valve is detached from the hole portion of the poppet, and the hole portion is opened to communicate the first and second fluid passages. Is detected.

  That is, the contact is electrically connected to an electrical terminal having conductivity and electrically connected to the outside, and the ring is electrically connected to a detection electrical terminal different from the electrical terminal. When the contact between the outer side wall surface of the ring and the contact is caused by the spring of the ring, the electrical terminal and the detection electrical terminal are conducted through the ring, and the conical portion of the needle valve is engaged with the hole of the poppet. And blocking the first and second fluid passages to detect the blockage of the first and second fluid passages. When the outer side wall surface of the ring and the contact are separated, at least the ring and the electrical terminal are Without conducting electricity, the conical portion of the needle valve is separated from the hole portion of the poppet, and the hole portion is opened to detect communication between the first and second fluid passages.

In the present invention, the movement of the collar of the needle valve causes the ring and the contactor to be brought into contact with or separated from each other, and is configured as an on-off switch that conducts and non-conducts between the ring and the contactor. Since the position of the needle valve can be directly detected even in a sealed space, the detection accuracy is high, expensive sensors and electric circuits are unnecessary, the structure is simple, the durability is excellent, and the sensor is in the stage before use. In addition, there is no need to adjust the position of the detection body, and there is no hysteresis or drift, and a poppet valve with a poppet position detection device that is easy to handle and easy to use is provided.
In addition, since the hook and the like can be arranged separately from the poppet moving and positioning means, it is possible to detect the position of the needle valve at a predetermined position within the moving distance of the needle valve. Furthermore, the conventional poppet valve only needs to be configured so that the collar portion is externally attached, and the influence on the basic structure of the control valve is small. Is easy.

It is a fragmentary sectional view at the time of neutral of the spool valve with a spool position detection device shown as a first reference. FIG. 10 is a partial cross-sectional view of a two-position type spool valve with a spool position detection device shown as a second reference when neutral (when an electromagnetic coil is de-energized and a spring is returned). FIG. 10 is a partial cross-sectional view of a three-position type proportional spool valve with a spool position detection device shown as a third reference when neutral (when the proportional electromagnetic coil is de-energized and when the spring is neutral). FIG. 10 is a partial cross-sectional view of a three-position type proportional spool valve with a spool position detection device shown as a fourth reference when neutral (when the proportional electromagnetic coil is de-energized and when the spring is neutral). It is a fragmentary sectional view at the time of neutral of the poppet valve with a poppet position detection device showing an embodiment of the present invention. It is operation | movement explanatory drawing of a poppet valve with a poppet position detection apparatus. It is a fragmentary sectional view of the conventional 3 position solenoid valve.

Before explaining the details of the poppet valve with poppet position detection device of the present invention, the spool valve with spool position detection device will be described with reference to FIGS. 1 to 4 as a reference of the poppet valve with poppet position detection device.
FIG. 1 is a partial cross-sectional view of a spool valve 31 with a spool position detection device 31 shown as a first reference of the poppet valve with a poppet position detection device of the present invention when neutral.
In FIG. 1, the same components as those in FIG. 7 are denoted by the same reference numerals.
The spool valve 31 with a spool position detecting device of the present invention is an oil-immersed three-position solenoid valve having electromagnetic coils 30a and 30b on the left and right sides. FIG. 1 shows a case where the solenoid valve is deenergized and the spool 2 is in a neutral state. Is shown.
As shown in FIG. 1, the main body 1 is provided with an axial hole 1a having a plurality of fluid passages, and a case 10a having stepped through holes 22a and 22b concentric with the axial hole 1a on both sides of the main body 1. 10b is fixed by a bolt (not shown). A spool 2 is inserted into the axial hole 1a of the main body 1 so as to switch the fluid passage by axial movement. Steps 2 a and 2 b are provided at both ends of the spool 2.

In the conventional spool 52 (see FIG. 7), the retainers 59a and 59b can be brought into contact with these portions, and the spool 52 is biased to the neutral position. However, in this embodiment, the step portions 2a and 2b Further, flange portions 52a and 52b are formed inward. Abutting surfaces 58a and 58b for receiving the retainers 59a and 59b are provided at both end portions of the main body 1.
Spring holding holes 33a and 33b for inserting the springs 32a and 32b are formed on the opposite sides (the main body 1 side) of the stepped through holes 22a and 22b of the cases (casings) 10a and 10b, and the springs 32a and 32b are elastic. The retainers 59a and 59b are urged to the contact surfaces 58a and 58b and the flange portions 52a and 52b of the spool 2 by the generated force, so that the neutral position of the spool 2 is maintained. Note that stoppers 57a and 57b may be provided on the contact surfaces 58a and 58b as in the prior art.

The screw 22c, 22d of the stepped through hole 22a, 22b is screwed with a tip screw of a solenoid guide 11a, 11b having a guide function, and the solenoid guide 11a, 11b is fixed to the case 10a, 10b. Male screws (not shown) are cut on the opposite sides (electromagnetic coils 30a, 30b side) of the screws 22c, 22d of the solenoid guides 11a, 11b, and nuts 34 are screwed.
The electromagnetic coils 30a and 30b into which the solenoid guides 11a and 11b are inserted are sandwiched between the cases 10a and 10b and the nuts 34 and 34, whereby the main body 1, the cases 10a and 10b, the solenoid guides 11a and 11b, and the electromagnetic coil 30a. , 30b are integrated.
The electromagnetic coils 30a and 30b are provided with connectors 54a and 54b for connecting coil terminals to an external power source. Connectors 19a and 19b that can be electrically connected to the outside are attached to the cases 10a and 10b.
The connectors 19a and 19b are provided with detection electric terminals 21a and 21b provided with terminals and electrically insulated, cases 10a and 10b, and electric terminals 20a and 20b electrically connected (grounded) to the main body 1.

The spool 2 is of a neutral all-port block type, and is provided with rods 55a and 55b concentric with the spool 2 and capable of contacting the end portions 2c and 2d of the spool 2. The rods 55a and 55b are connected to a movable iron core (not shown) and inserted into the guide holes 11c and 11d, and the movable iron core and the electromagnetic coils 30a and 30b bias the rods 55a and 55b in the direction of the spool 2. Means.
In this case, the electromagnetic coils 30a and 30b have a function of pressing the rods 55a and 55b against the spool 2 via the movable iron core and moving them in the axial direction. It has a hollow hole larger than the outer diameter of the small diameter portions 2e and 2f forming the step portions 2a and 2b of the spool 2 and smaller than the outer diameter of the step portions 2a and 2b, and can be brought into contact with the step portions 2a and 2b. Contacts 4a and 4b are slidably fitted to the small diameter portions 2e and 2f. The contacts 4a and 4b are provided so as to push the spool 2 by springs 12a and 12b provided between the end portions of the solenoid guides 11a and 11b and the contacts 4a and 4b. The step portions 2 a and 2 b function so that the contacts 4 a and 4 b can move integrally with the spool 2 when the spool 2 is displaced.

The step portions 2a and 2b of the spool 2 protrude into stepped through holes 22a and 22b. The first spacers 5a and 5b, the rings 3a and 3b, and the second spacers 6a and 6b having a hollow hole concentric with the shaft of the spool 2 are sequentially arranged from the stepped portions 23a and 23b of the stepped through holes 22a and 22b. The solenoid guides 11a and 11b are inserted and fixed by being sandwiched and fixed.
The first spacers 5a and 5b have concave inlay portions 5c and 5d formed on the side surfaces thereof. Convex portions 3c, 3d, 3e, 3f that are fitted into the inner diameters of the concave inlay portions 5c, 5d of the first spacers 5a, 5b and the second spacers 6a, 6b are provided on both end faces of the rings 3a, 3b. Is formed.
As a result, the rings 3a and 3b are sandwiched between the first and second spacers 5a, 5b, 6a and 6b along the axial direction and the direction perpendicular to the axis, thereby preventing the rings 3a and 3b from contacting the cases 10a and 10b. ing. The first and second spacers 5a, 5b, 6a, and 6b are electrically insulating materials so that the rings 3a and 3b and the cases 10a and 10b are not electrically connected.

In FIG. 1, the electrical insulating material is a glass fiber reinforced polyamide 66 resin because of its mechanical strength, heat resistance, insulation, oil resistance, and the like. Accordingly, the rings 3a and 3b are electrically insulated from the cases 10a and 10b and the first and second spacers 5a, 5b, 6a and 6b.
Naturally, the diameters of the hollow holes of the first spacers 5a and 5b and the rings 3a and 3b are formed so as not to interfere with the moving spool 2. The second spacers 6a and 6b are cylindrical and are provided so as not to interfere with the contacts 4a and 4b and the springs 12a and 12b.

The contacts 4a and 4b are provided so as to press the spool 2 by the elastic force of the springs 12a and 12b. The outer peripheries of the contacts 4a and 4b are formed smaller than the inner diameters of the second spacers 6a and 6b, and come into contact with the outer end faces (contact surfaces between the contacts and the rings 3a and 3b) 13a and 13b of the rings 3a and 3b. Has been.
When the step portions 2a, 2b of the spool 2 are inside the positions of the outer side end faces 13a, 13b of the rings 3a, 3b, the contacts 4a, 4b abut against the outer side end faces of the rings 3a, 3b, When the step portions 2a, 2b of the spool 2 are outside the positions of the outer end faces of the rings 3a, 3b, the contacts 4a, 4b are provided so as to contact the step portions 2a, 2b of the spool 2.

The contact surfaces (outer side end surfaces) 13a and 13b of the rings 3a and 3b with the contacts 4a and 4b are not coated with an insulating coating, and the metal surfaces are exposed, so the rings 3a and 3b and the contacts 4a and 4a are contacted by contact. 4b is made to be electrically conductive. The contacts 4a and 4b, which are conductors, are always in conduction with the cases 10a and 10b, which are also conductors, via springs 12a and 12b, which are also conductors, and solenoid guides 11a and 11b.
Since the cases 10a and 10b are connected to the electrical terminals 20a and 20b, the contacts 4a and 4b and the electrical terminals 20a and 20b are always in conduction. When the spool 2 is in the neutral position, the contacts 4a and 4b are provided so as not to contact the step portions 2a and 2b with gaps 35a and 35b, and the contacts 4a and 4b and the rings 3a and 3b are in contact with each other. However, it is in a conductive state.

A communication path 14 is formed in the lower position of the connectors 19a and 19b of the case 10a and 10b of the main body 1 in a direction substantially perpendicular to the axis of the stepped through holes 22a and 22b. The communication path 14 is provided at the same position as the side surfaces of the rings 3a and 3b provided in the stepped through holes 22a and 22b.
Further, a through hole 18 is formed in the bush 8, an O-ring 17 that is a seal member is mounted in the through-hole 18, and a seal plate 9 for stopping the O-ring 17 is provided. 9 is made of glass fiber reinforced polyamide 66 resin which is an electrical insulating material.

Reference numerals 7a and 7b are conductive rods, the conductive rods 7a and 7b pass through the through hole 18 and the O-ring 17 hole, and the outer periphery of the conductive rods 7a and 7b is the O-ring 17 of the through hole 18. It is sealed. One end of each of the conductive rods 7a and 7b is provided on the side surfaces of the rings 3a and 3b, and is therefore screwed into the screw 15 in an electrically conductive state. The other end of each of the conductive rods 7a and 7b is connected to the detection electrical terminal 21a, 21b and the lead wire 24, respectively.
Thereby, the rings 3a and 3b, the conductive rods 7a and 7b, and the detection electrical terminals 21a and 21b are always electrically connected, while being insulated from the cases 10a and 10b, the solenoid guides 11a and 11b, and the like. .

The spool valve 31 with a spool position detecting device shown in FIG. 1 is basically configured as described above. Next, the operation will be described.
As shown in FIG. 1, at the neutral time when both the electromagnetic coils 30a and 30b are not excited, the rings 3a and 3b on both sides and the contacts 4a and 4b are in contact with the contact surfaces 13a and 13b. 20a, 20b and the detection electrical terminals 21a, 21b are electrically connected to each other.
In FIG. 1, when the right electromagnetic coil 30b is excited, the spool 2 moves in the arrow X direction. As a result, the right contact 4b and the ring 3b remain in contact with the contact surface 13b, but the left contact 4a moves in the direction of the arrow X as the spool 2 moves, so the left contact 4a And the ring 3a are not in contact with each other. That is, the right electrical terminal 20b and the detection electrical terminal 21b are electrically connected, but the left electrical terminal 20a and the detection electrical terminal 21a are not electrically connected.

Based on the same principle, when the left electromagnetic coil 30a is excited, the spool 2 moves in the arrow Y direction. The left electrical terminal 20a and the detection electrical terminal 21a are electrically connected, but the right electrical terminal 20b and the detection electrical terminal 21b are not electrically connected. Thus, the contact states between the left and right contacts 4a and 4b and the rings 3a and 3b are all different in the non-excitation state, the excitation state of the right electromagnetic coil 30a, and the excitation state of the left electromagnetic coil 30b.
Therefore, when the contact state between the contacts 4a, 4b and the rings 3a, 3b is different, the conduction state between the electrical terminals connected to the contacts 4a, 4b and the rings 3a, 3b also changes. It is possible to directly detect the position of the spool 2 using.

Note that the position between the neutral position of the spool 2 and the switching position can be adjusted by appropriately adjusting the gaps 35a and 35b. Further, the first and second spacers 5a, 5b, 6a, 6b for fixing the rings 3a, 3b, the bush 8 for supporting the conductive rods 7a, 7b and the seal plate 9 need to be insulated. It may be manufactured or may be subjected to an insulation treatment such as an insulating coating after being manufactured with a conductor.
Further, the contacts 4a and 4b are electrically connected to the solenoid guides 11a and 11b and the cases 10a and 10b through contact conductor parts such as the springs 12a and 12b and are connected to the electric terminals 20a and 20b. You may connect an electric wire etc. directly and connect with an external terminal (not shown).

FIG. 2 is a partial cross-sectional view of the poppet valve with poppet position detection device according to the present invention when the spool valve 31 'with two-position spool position detection device shown in the second reference is neutral (when the electromagnetic coil is de-energized and the spring is returned). FIG. In FIG. 2, the same components as those of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. The same applies hereinafter.
As shown in FIG. 2, the second spool valve 31 ′ with a spool position detecting device is an oil-immersed two-position solenoid valve having an electromagnetic coil 30a on the left side. In the case of FIG. 1, the opening / closing switch of the case 10b, the ring 3b, and the contact 4b is provided only on one side with respect to the main body 1, and the electromagnetic coil 30a including the rod 55a and the movable iron core for operating the spool 2 ' It differs in that it is only provided. Since no electromagnetic coil is required on the case 10b side, a solenoid guide, for example, a solenoid guide 11b (see FIG. 1) is not provided, and a tip screw of a plug 11 ′ having a cap nut shape is screwed. Further, the electromagnetic coil 30a side may be the same as the conventional structure shown in FIG. 5, but a cover 36 is provided for the convenience of mounting the electromagnetic coil 30a.

In the spool valve 31 ′ with a two-position type spool position detecting device, the right ring 3b and the contact 4b are in contact with each other when the electromagnetic coil 30a is neutral (when the spring is returned). The terminal 20b and the detection electrical terminal 21b are electrically connected to each other. When the electromagnetic coil 30a is excited, the spool 2 'moves in the arrow Y direction.
Then, the contact 4b moves in the direction of the arrow Y as the spool 2 'moves, so that the contact 4b and the ring 3b are not in contact with each other. As described above, the electrical connection state of the electric terminals 20b and 21b connected to the contact 4b and the ring 3b changes according to the energization state of the electromagnetic coil 30a. It can be directly detected whether it is in a position.

FIG. 3 is a partial cross-section of a three-position type spool valve 41 with a spool position detecting device shown as a third reference of the poppet valve with a poppet position detecting device of the present invention (when the proportional electromagnetic coil is de-energized and the spring is neutral). FIG.
This spool valve 41 with a spool position detecting device excludes stoppers 57a and 57b (see FIG. 7) and retainers 59a and 59b (see FIGS. 1 and 5) for mechanically holding the spool 2 in a neutral position, The position of the spool 2 is controlled by balancing the position of the spool 2 with the opposing springs 37a and 37b by holding the neutral position by the elastic force of 37a and 37b and changing the energization current of the electromagnetic coils 30a and 30b. The embodiment is a proportional control valve that proportionally controls the flow rate and pressure.
In this case, opposing springs 37a and 37b are provided on the flange portions 52a and 52b formed on the spool 2.

FIG. 6 is a partial cross-sectional view of a three-position type spool valve with a spool position detecting device 41 ′ shown as a fourth reference of the poppet valve with a poppet position detecting device of the present invention when neutral (when a proportional electromagnetic coil is de-energized and a spring is neutral); is there.
FIG. 4 shows an example in which the opposing springs 38a and 38b corresponding to the opposing springs 37a and 37b described in the third embodiment are urged from the outside of the rings 3a and 3b.
As shown in FIG. 4, in the spool valve 41 'with a spool position detecting device, bowl-shaped step portions 2 "a, 2" b are formed at both ends of the spool 2 ". Further, the step portions 2" a, 2 ″ Contacts 4a and 4b and springs 12a and 12b are provided so as to be able to abut against b, and proportional springs 38a and 38b having an outer diameter smaller than the inner diameter of the contacts 4a and 4b and springs 12a and 12b are provided on the inner side. The tips of the opposing springs 38a and 38b are in contact with the stepped portions 2 "a and 2" b.

The opposite sides of the springs 12a and 12b and the opposing springs 38a and 38b are supported by solenoid guides 11a and 11b. Thereby, a plurality of means for moving or positioning the spool 2 ″ can also be applied to those arranged so as to act through the rings 3a and 3b from outside the rings 3a and 3b.
In this case, as can be understood from FIG. 4, the axial hole 1a of the main body 1 and the stepped through holes 22a, 22b can be coaxially secured, and the main body 1 and the casings 10a, 10b are formed as one member. It is also possible to configure. Further, by forming the step portions 2 ″ a, 2 ″ b into a bowl shape, the springs 12a, 12b and the opposing springs 38a, 38b can be arranged in a double manner, and the length of the main body 2 can be reduced as a unit. .

  In contrast to the conventional example, the counter springs 38a and 38b are provided for holding the neutral position, so that the detection springs 12a and 12b are added. Therefore, it goes without saying that the strengths of the neutral springs for maintaining and detecting the neutral positions 38a and 38b and the springs 12a and 12b are appropriately adjusted. On the other hand, since the degree of freedom in spring design increases, it is possible to increase the spool driving force at the time of spring return and to improve reliability.

Next, a poppet valve with a poppet position detection device according to an embodiment of the present invention will be described.
5 and 6 are longitudinal cross-sectional views showing the schematic structure of the poppet valve 60 with a poppet position detecting device. 5 and 6, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 5, a poppet valve 60 with a poppet position detection device communicates with an axial hole (first axial hole) 1a in a main body 1 and an axial hole 1a larger than the diameter of the axial hole 1a. An axial hole (second axial hole) 61 and an axial hole (third axial hole) 62 that is larger than the hole diameter of the axial hole 61 and communicates with the axial hole 61. Fluid passages (first fluid passages) 63 and (second fluid passages) 64 which are substantially orthogonal to the axial direction are formed in the main body 1 in the axial holes 1 a and 61. The axial holes 1a, 61, 62 are all provided coaxially.
A sleeve 65 is fitted into the axial holes 1a and 62. The sleeve 65 has a flange 65a formed at one end thereof engaged with the end surface of the axial hole 62, and the outer peripheral surface of the cylindrical portion 65b is inserted into the axial hole 1a. The large-diameter portion 66a of the poppet 66 is slidably fitted on the large-diameter inner peripheral surface of the sleeve 65, and the tip of the small-diameter portion 66b of the poppet 66 is on the end surface of the inner peripheral surface of the cylindrical portion 65b of the sleeve 65. It is provided to abut.

  A hole 67 is formed in the central portion of the small diameter portion 66 b in the axial direction, and a ball 68 is loaded by a screw member 69. The needle valve 70 is slidably disposed on a flange 65a of the sleeve 65 and a bush 71 fitted on the inner peripheral surface of the large diameter. The other end of the needle valve 70 is connected to a plunger 73, which is a movable iron core slidable within the solenoid guide 72, by a pin 74. The needle valve 70 is pressed against the poppet 66 by the elastic force of the spring (second spring) 75 and functions to close the hole 81. The solenoid guide 72 is screwed to the main body 1 by screw means 76 through a spacer 88.

The ring 3a which is a conductor is fixed by first and second spacers 5a and 6a which are insulators, a corrugated washer 77 and a retainer 78 which are conductors. Thereby, the ring 3a is maintained in an insulated state from the main body 1. The contact 4a is a conductor, and is pressed against the ring 3a by a spring (first spring) 12a that is also a conductor. Therefore, the contact 4a is always in conduction with the main body 1 through the spring 12a, the plunger 73 spring 75, the spacer 89, and the solenoid guide 72.
Further, when the fluid passages 63 and 64 are blocked, the ring 3a and the contact 4a are maintained in a reliable contact state, and the ring 3a is considered in consideration of variations in processing dimensions of each component. In order to move the ring 3a, a gap 80 is provided between the ring 3a and the end surface 79a of the flange 79 provided on the needle valve 70.

The poppet valve 60 with poppet position detecting device is basically configured as described above, and the operation will be described next.
First, when pressure fluid is supplied from the fluid passage 64 while the electromagnetic coil 30a is not excited, the hole 87 is provided in the poppet 66, so that the fluid chamber (first fluid chamber) 82 and (second fluid chamber) are provided. ) 83 is kept the same, but the pressure receiving area 86 on the fluid chamber 82 side is larger than the pressure receiving area 85 on the fluid chamber 83 side due to the pressure receiving area difference between the both end faces of the poppet 66. The conical portion 70a of the needle valve 70 contacts the hole 81 and blocks between the fluid passages 63 and 64 (see FIG. 5).

  Further, since the ring 3a and the contact 4a are in contact with each other, the electrical terminal 20a is electrically connected to the detection electrical terminal 21a, and the needle valve is detected by detecting the electrical connection state between the electrical terminal 20a and the detection electrical terminal 21a. The communication between the fluid passages 63 and 64 can be confirmed remotely by checking the position detection of 70.

When the electromagnetic coil 30a is excited in this state, the plunger 73 is displaced in the direction of the arrow X as shown in FIG. 6, and the needle valve 70 cooperates therewith. When the needle valve 70 is displaced in the direction of the arrow X, the hole 81 closed by the conical portion 70 a of the needle valve 70 is opened, and the pressure fluid in the fluid chamber 82 flows to the fluid passage 63 through the hole 81. When the pressure fluid flows from the fluid chamber 82 to the fluid passage 63, the pressure of the fluid chamber 82 becomes lower than the pressure of the fluid chamber 83.
Since the pressure of the fluid chamber 82 becomes lower and the force of (the pressure of the fluid chamber 82 × the pressure receiving area 86) becomes smaller than the force of (the pressure of the fluid chamber 83 × the pressure receiving area 85), the poppet 66 is displaced in the arrow X direction. To do. Accordingly, the tip end portion of the small diameter portion 66b of the poppet 66 is separated from the end surface of the inner peripheral surface of the cylindrical portion 65 of the sleeve 65, so that the fluid passages 63 and 64 are in communication and the pressure fluid flows from the fluid passage 63 to the fluid passage 64. It becomes like this.

Next, when pressure fluid is supplied from the fluid passage 63 and the electromagnetic coil 30a is in a non-excited state, the force obtained by adding the pressure receiving area 84 to the pressure of the fluid passage 63 is the force of the spring 75-the elasticity of the spring 12a. If greater than the force, the pressure fluid pushes poppet 66 and flows into fluid passage 64.
When pressure fluid is supplied from the fluid passage 63 and the electromagnetic coil 30 a is excited, the plunger 73 is displaced in the direction of the arrow X, so that the poppet 66 is not biased by the spring 75.
Therefore, since the force that pushes the poppet 66 is only the sliding resistance of the poppet 66, the pressure fluid freely flows from the fluid passage 63 to the fluid passage 64. In this state, when the electromagnetic coil 30a is excited to open the hole 81 closed by the needle valve 70, the ball 68 prevents the pressure fluid from flowing from the fluid passage 63 through the hole 81 into the fluid chamber 82. is doing. For this reason, the hole 81 is closed by displacing the poppet 66 in the arrow X direction. Here, when the needle valve 70 is displaced in the direction of the arrow X, the contact 4a also cooperates with the rod 79, so that the contact between the ring 3a and the contact 4a is lost and the electrical connection between the electrical terminal 20a and the detection electrical terminal 21a is released. Is done.

  The poppet valve 60 with a poppet position detecting device can detect the presence or absence of the flow of the pressure fluid by directly detecting the position of the needle valve 70 and confirming the communication and blocking states between the fluid passages 63 and 64.

1 Body 1a Axial hole
2, 2 ', 2 "Spool 2a, 2b, 2" a, 2 "b Stepped portion 3a, 3b Ring 4a, 4b Contactor 5a, 5b First spacer 5c, 5d Inlay portion 6a, 6b Second spacer 7a 7b Conductive rod 8 Bushing 11a, 11b, 11 'Guide (solenoid guide)
12a, 12b Spring 13a, 13b Outer end face (contact surface)
14 Communication path 15 Female thread 16, 17 Seal member (O-ring)
18 Through hole 20a, 20b Electrical terminal (ground)
21a, 21b Detection electric terminal 22a, 22b Through hole 23a, 23b (Through hole) Stepped portion 24 Lead wire 30a, 30b Electromagnetic coil 31, 31 ', 41, 41 "Spool valve with spool position detection device 55a, 55b Rod 60 Poppet valve with poppet position detector

Claims (1)

A first axial hole forming first and second fluid passages and connected to the first fluid passage and coaxially communicating with the first axial hole and connected to the second fluid passage A body having a second axial hole and a third axial hole communicating with the second axial hole;
A sleeve having an outer peripheral surface of a cylindrical portion fitted in the first axial hole and a flange portion fitted in a third axial hole and having a large-diameter inner peripheral surface and an inner peripheral surface inward;
A poppet that has a large-diameter portion inserted into the large-diameter inner peripheral surface of the sleeve and a small-diameter portion inserted into the inner peripheral surface of the sleeve, and opens and closes the first and second fluid passages in the axial direction;
Means for moving or positioning the poppet;
A control valve with
The means for moving or positioning the poppet is
When the poppet is inserted into the sleeve, the first inner diameter is formed by the inner diameter surface of the sleeve, the larger diameter portion and the smaller diameter portion of the poppet, and the inner diameter surface of the sleeve and the small diameter portion. And a second fluid chamber;
A hole formed in the axial direction of the central portion of the sleeve for communicating the large diameter inner peripheral surface side and the inner peripheral surface side of the sleeve divided by the poppet;
A needle valve in which a conical portion that engages with the hole of the sleeve is provided at a distal end portion of a small diameter portion that is connected to a plunger and integrated with the large diameter portion;
A flange provided at a connection portion between the large diameter portion and the small diameter portion of the needle valve;
A ring provided concentrically with the needle valve so as to be able to enter and exit the large diameter portion of the needle valve and not to interfere with the needle valve;
Either the outer side end surface of the ring or the collar part or the collar part can be moved in the axial direction so as to be able to contact at the same time, and provided so as not to interfere with the needle valve except the collar part concentrically with the needle valve. A ring contact,
A first spring that biases the contact against the flange or the ring;
A second spring that urges the needle valve to engage the conical portion of the needle valve with the hole of the sleeve;
When the contact and the outer side end surface of the ring abut, a gap provided between the end surface of the flange and the outer side wall surface of the ring,
With
The contact is electrically connected to an electrical terminal having electrical conductivity and electrically connectable to the outside, and the ring is electrically connected to a detection electrical terminal different from the electrical terminal, When the outer side wall surface of the ring and the contact are in contact with each other by the spring of 1, the electrical terminal and the detection electrical terminal are conducted through the ring, and the conical portion of the needle valve is connected to the poppet. When the hole is closed by closing the hole and detecting the blocking of the first and second fluid passages, the outer side wall surface of the ring is separated from the contact At least the ring and the electrical terminal do not conduct electricity, and the conical portion of the needle valve is detached from the hole portion of the poppet to open the hole portion so as to communicate the first and second fluid passages. Poppet position detection device characterized by detecting With the poppet valve.

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