JPH07100898B2 - Fluid pressure regulator for jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fluid pressure adjusting device in a jet loom.

(Prior Art) Generally, in a fluid jet loom, a weft yarn measured and stored by a certain amount in a length measurement storage mechanism is jetted into a warp opening by a main nozzle and then assisted by an auxiliary nozzle to jet a weft yarn guide. It flies into the weft passing path composed of members and is beaten by a reed. If the jet pressure of the main nozzle and the auxiliary nozzle at the time of weft insertion and flying of the weft described above is too large, the weft is cut, and if it is too small, the tip of the weft hangs down, which causes a weft insertion error. Therefore, the control of the fluid pressure in the air tank, which determines the fluid injection pressure in the main nozzle and the auxiliary nozzle, is extremely important.

Therefore, as disclosed in, for example, JP-A-53-14868, a pressure adjusting valve is provided in the fluid circuit. However, the pressure adjusting valve shown here is generally A proportional solenoid valve using a diaphragm as shown in FIG. 6 is used. That is, the flapper 52 attached to the electromagnetic solenoid 51 and the nozzle 53 are arranged so as to face each other, and the compressed fluid flowing from the fluid circuit (not shown) into the housing 55 through the inflow hole 54 passes through the orifice 57 and the nozzle 53 through the orifice 57. And the fuel is ejected to the flapper 52. At this time, a predetermined voltage is applied to the solenoid 51 to move the flapper 52 downward, and the diaphragm 59 vibrates up or down until the downward moving pressure becomes equal to the injection pressure of the nozzle. With the movement of the diaphragm 59, the opening amount of the relief valve 60 changes, and the amount of fluid corresponding to the applied voltage is supplied from the inflow hole 54 side to the outflow hole 62.

(Problems to be Solved by the Invention) In the above-described configuration in which the pressure is adjusted by the flapper and the nozzle, irregular vibration (chattering) occurs due to antagonism of two pressures.
Is likely to occur. However, since the diaphragm is made of rubber, it does not have sufficient strength against vibration. Therefore, if this valve is used for a long period of time, the diaphragm may deteriorate, and not only there is a problem in terms of durability, but the diaphragm is also susceptible to elastic deformation due to vibration during use, causing malfunction of the flow control valve. Is caused, and there is a problem in that the fluid ejection pressure from the nozzle is rounded. Further, the solenoid valve using the diaphragm has a problem that not only the structure is complicated and the manufacturing is complicated, but also the number of parts is increased and the manufacturing cost is increased. Configuration of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a fluid pressure adjusting device in which a pressure adjusting valve for adjusting the fluid pressure is arranged in a fluid passage used in a jet loom. In the device, a plunger driven by a solenoid and having a pressure receiving plate at its tip and a valve body biased by the pressure receiving plate are arranged in the housing, and the valve body is provided with a fluid A fluid passage that forms an inflow chamber that communicates with the inflow hole and an outflow hole, and that axially penetrates the valve and the valve body that are in contact with the throttle portion that defines the circulation hole and the inflow chamber to the pressure receiving plate side. A first exit side fluid receiving surface is formed on the valve body side between the pressure receiving plate and the valve body, and a first protruding side fluid receiving surface is formed between the valve body and the flow hole. Forming a second exit side fluid receiving surface, The Between the inflow chamber in the body 2
A first exit-side fluid receiving surface and a second exit-side fluid receiving surface which are formed on the valve body and which form a protruding-side fluid receiving surface.
A means is adopted in which the pressure receiving area in the sliding direction of the valve body is made equal between the protruding side fluid receiving surface and the second protruding side fluid receiving surface.

(Operation) By adopting the above means, the present invention makes the upward and downward fluid pressures acting on the valve body always equal, and proportionally adjusts the fluid pressure in the housing and the voltage applied to the solenoid. Therefore, it is not necessary to provide a special adjusting means, the proper fluid pressure is always maintained, and
Excellent in high-speed followability.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS.

As shown in FIG. 1, the weft Y, which is measured and stored by a predetermined amount by a weft measuring and storing mechanism (not shown), is led out to the main nozzle 1, and is ejected onto the sley 2 by the fluid ejection from the main nozzle 1. It is jetted to the weft guide members 3 arranged in a row. After that, the weft Y is assisted by the jet fluid of an appropriate number of auxiliary nozzles 4 arranged on the sley 2, flies in the weft passage S formed by the weft guide member 3, and is beaten by the reed R.

The main nozzle 1 is connected to a first air tank 6 via a first fluid passage 5, and the compressed fluid sent from the first air tank 6 to the main nozzle 1 is transferred to a switching valve 7a interposed in the first fluid passage 5. It is distributed and cut off. Similarly, the auxiliary nozzle 4 is also connected to the second air tank 9 through the second fluid passage 8, and the switching valve 7b is also provided in the second fluid passage 8.

The first and second air tanks 6 and 9 are connected to a fluid source through third and fourth fluid passages 10a and 10b, respectively, and electromagnetic pressure control valves are provided in the third and fourth fluid passages 10a and 10b. 1
1a and 11b are interposed.

Hereinafter, specific configurations of the pressure adjusting valves 11a and 11b will be described. However, since the two have the same configuration, the main nozzle 1
Only the pressure adjusting valve 11a on the side will be described. As shown in FIGS. 2 and 3, the cylindrical housing 12 is closed at both ends.
Is composed of a core portion 13 and a flow rate adjusting portion 14. Solenoid 15 is embedded in the periphery of the core portion 13, and a plunger 17 made of a magnetic material is housed in a drive chamber 16 formed in the upper central portion so as to be vertically slidable. As shown in FIG. 3, when the plunger 17 descends, the lower surface of the plunger 17 contacts the bottom portion 18 of the drive chamber 16, and the lowermost position of the plunger 17 is determined.
An opening 19 is formed in the central portion of the bottom portion 18 of the drive chamber 16, and a pressing rod protruding downward from the bottom surface of the plunger 17 is provided in the rod movement passage 20 penetrating the core portion 13 through the opening 19.
20a extends.

On the other hand, a valve body accommodating chamber 21 having a circular cross-section that opens upward is formed in the upper part of the flow rate adjusting unit 14, and a cylindrical valve body 22 made of a rigid body is accommodated in the interior thereof. The lower end of the pressing rod 20a slightly protruding from the rod moving passage 20 is fitted to the upper surface of the pressure receiving plate 23, and the upper end of the sliding portion 22a formed on the valve body 22 is on the lower surface of the pressure receiving plate 23. Abutting.

Further, the accommodation chamber 21 is formed with a corner portion 24 at a substantially central portion in the vertical direction so as to project slightly inward.
The lower part has a slightly smaller diameter. It should be noted that the plunger 17 reaches the lowest position, and the push rod 20a
When is greatly projected into the accommodation chamber 21, the lower surface of the pressure receiving plate 23 is brought into contact with the corner portion 24 to determine the most lowered position of the pressure receiving plate 23. Further, the valve body 22 is provided at the bottom of the accommodation chamber 21.
A communication hole 25 having the same diameter as the outer diameter of the sliding portion 22a is provided, and the peripheral portion of the communication hole 25 slightly projects upward to form a small wall 26. Then, on the outside of the small wall 26, a push spring 27 is hooked between the bottom portion of the storage chamber 21 and the flange portion 22b of the valve body 22, and always biases the valve body 22 upward. There is.

An inflow chamber 29, which communicates with the communication hole 25 of the accommodation chamber 21 via the circulation hole 28, is formed in the lower portion of the flow rate adjusting unit 14, and the upper portion of the inflow chamber 29 has a boundary portion with the circulation hole 28. A narrowed portion 29a that slightly projects downward is provided.

Further, in the flow hole 28, the valve element 22 is formed in a small diameter through the step portion 36, and is arranged at a sufficient distance from the inner wall of the flow hole 28. In the inside of the inflow chamber 29, the valve body 22 has a large diameter again and a valve 31 is formed. When the solenoid 15 is not energized, the valve body 22
The upper surface of the valve 31 is located at the retracted position below the narrowed portion 29a of the inflow chamber 29, and is slightly separated therefrom. When the solenoid 15 is energized and moves to the lowered position, the valve body 22 is pressed through the pressure receiving plate 23. Then, the valve 31 moves to the protruding position.

An inflow hole 32 is transparently provided in the circulation hole 28, and an outflow hole 33 is provided in the inflow chamber 29. The respective holes 32, 33 communicate with the first and third circulation passages 5, 10a, respectively. In addition, the valve body accommodation chamber 21
A through hole 21a for allowing the fluid to escape is provided through.

FIG. 4 particularly shows the valve body 22 in detail, the upper surface of which is provided with a first exit-side fluid receiving surface 34 that inclines downward toward the center, and the same receiving surface 34 and the lower surface of the pressure receiving plate 23. A fluid admission chamber 34a is formed between them, and the step portion 36 of the central small diameter portion is formed.
A first protruding side fluid receiving surface 35 is formed on the upper side. Further, the stepped portion 36 of the valve 31 of the valve element 22 forms a retreat side receiving surface, and a second protruding side fluid receiving surface 37 is formed on the lower surface of the valve 31. Further, a fluid passage 38 extending in the longitudinal direction is provided at the center of the valve body 22 so as to penetrate the inflow chamber of the housing 12.
The compressed fluid in 29 flows into the fluid entrance chamber 34a.

Now, the operation of the pressure adjusting device configured as described above will be described below.

When the compressed fluid supplied from the fluid source to the first air tank 6 reaches the pressure regulating valve 11a of the third fluid passage 10a, it flows into the flow hole 28 from the inflow hole 32, and at the same time, the main nozzle 1
The voltage determined based on the desired ejection pressure of is applied to the solenoid 15.

When the solenoid 15 is energized, the plunger 17 moves downward, and accordingly, a downward dynamic pressure is applied to the valve body 22 via the pressure receiving plate 23, and this is moved in the protruding direction to move the valve 31 and the throttle portion 29a. Increase the space between and. On the other hand, the fluid flowing into the inflow hole 32 is filled in the flow hole 28 between the step portion 36 of the valve body 22 and the valve 31, and further passes between the throttle portion 29a and the valve 31 to flow into the inflow chamber. 2
Inflow into 9. The compressed fluid passes through the fluid passage 38 of the valve body 22 from the inflow chamber 29 and reaches the fluid entry chamber 34a, and then a pressure that opposes the lower dynamic pressure of the plunger 17 is applied to the lower surface of the pressure receiving plate 23. The pressure receiving plate 23 is pushed upward. Then the valve body
22 is moved upward by the push spring 27, and the valve 31 and the throttle portion 29a are moved.
And the distance between and decreases, the amount of fluid flowing into the inflow chamber decreases, and the fluid pressure is maintained at an appropriate value.

The fluid pressure is applied to the first exit side fluid receiving surface 34 in the fluid entrance chamber 34a and to the first protruding side fluid receiving surface 35 in the flow hole 28.
Further, in the inflow chamber 29, the stepped portion 36 and the second protruding side fluid receiving surface 37 which are the second exit side fluid receiving surface are covered. Fourth
As shown in the figure, the pressure receiving area a projected in the axial direction of the first exit side fluid receiving surface 34 is the pressure receiving area b between the second projecting side fluid receiving surface 37 and the second exit side fluid receiving surface 36, It is a value obtained by adding the pressure receiving area e of the first exit side fluid receiving surface 34 to the difference d of c. Therefore, 2
When the pressures of the fluids on the two exit side fluid receiving surfaces 34 and 36 and the two projecting side fluid receiving surfaces 35 and 37 are equal, and the fluid pressure is significantly larger than the lower dynamic pressure of the plunger 17. However, the valve body 22 is not moved upward by the fluid pressure. Therefore, the distance between the throttle portion 29a and the upper surface of the valve 31 is maintained in proportion to the magnitude of the voltage applied to the solenoid 15, and a desired amount of fluid is supplied to the first air tank 6 from the outflow hole 33. . Therefore, the main nozzle 1 carries out weft insertion at an appropriate injection pressure.

In the pressure adjusting device described above, the voltage applied to the solenoid 15 and the pressure of the compressed fluid flowing in the housing 12 are proportionally adjusted by the four fluid receiving surfaces 34, 35, 36, 37. The main nozzle 1, depending on the strength of the thread
If the injection pressure of the auxiliary nozzle 4 is set in advance and a voltage corresponding to this set value is applied to the solenoid 15, a predetermined amount of fluid is supplied to both nozzles 1 and 4, and these injection pressures also reach the set value. Retained.

Further, since the fluid receiving surfaces 34, 35, 36, 37 are formed on the pressure regulating valve 11, the diaphragm used in the conventional product can be omitted.

The present invention is not limited to the above-described embodiment, and, for example, the pressure adjusting device is interposed in the first and second fluid passages 5 and 8, and the air tanks 6 and 9 are connected to the main nozzle 1 and the auxiliary nozzle 4. The pressure of the fluid sent to the pressure adjusting plate 23 is adjusted, or as shown in FIG. 5, the pressure receiving plate 23 is bent at its peripheral portion downward to form a fitting portion 39, and a valve is provided in the fitting portion 39. The upper part of the body 22 is tightly fitted to prevent fluid leakage and the accommodation chamber 21
Any modification can be made without departing from the invention, such as omitting the through hole 21a.

As described above in detail, according to the present invention, the pressure receiving areas of the fluid receiving surface on the projecting side and the fluid receiving surface on the withdrawing side formed with the valve for controlling the fluid passage amount that projects and retracts in the housing are made equal. Since the fluid pressure inside the housing and the voltage applied to the solenoid are proportionally adjusted, this configuration acts as an adjusting means, so no special adjusting means is required, and the valve operation is always maintained accurately and desired. Nozzle injection pressure can be obtained, and the structure is simplified,
Not only can the manufacturing cost be kept low, but it is also highly durable, and has the excellent effect of high-speed follow-up without malfunction.

[Brief description of drawings]

FIG. 1 is a perspective view showing a pressure adjusting device of the present invention together with a weft inserting mechanism, FIG. 2 is a sectional view showing a pressure adjusting valve, FIG. 3 is a sectional view showing changes in FIG. 2, and FIG. FIG. 5 is a sectional view showing a body, FIG. 5 is a sectional view showing another example of the pressure receiving plate, and FIG. 6 is a sectional view showing a conventional technique. Housing 12, solenoid 15, valve body 22 as a fluid passage amount control valve, first exit side fluid receiving surface 34, first protruding side fluid receiving surface 35, step portion (second exit side fluid receiving surface) 36, second protruding side fluid receiving surface 37.

Claims (1)

[Claims] 1. A fluid pressure adjusting device having a pressure adjusting valve for adjusting a fluid pressure in a fluid passage used in a jet loom, the plunger being driven by a solenoid in a housing and having a pressure receiving plate formed at a tip thereof. And a valve body urged by the pressure receiving plate, the valve body forming an inflow chamber communicating with an inflow hole of the fluid and an inflow chamber communicating with the outflow hole between the valve body and the inner wall surface of the housing. A valve and a valve body that are in contact with a throttle section that divides the hole and the inflow chamber form a fluid passage that axially penetrates to the pressure receiving plate side, and the valve body side between the pressure receiving plate and the valve body has a first exit side. A fluid receiving surface is formed, and a first protruding side fluid receiving surface and a second exit side fluid receiving surface are formed between the valve body and the flow hole, and the valve body is connected to the inflow chamber. Is formed with a second protruding side fluid receiving surface, and is further formed on the valve body. The pressure receiving area in the sliding direction of the valve element between the first exit side fluid receiving surface and the second exit side fluid receiving surface and the first projecting side fluid receiving surface and the second projecting side fluid receiving surface. Fluid pressure regulator in equally formed jet loom.