TW201341696A - Flow control valve - Google Patents

Abstract

The present invention provides a flow control valve, which comprises a valve body and an adjustment member. The valve body has an inlet communicating with a main channel inside the valve body. The main channel is diverted to a groove chamber via a first channel. The groove chamber is then connected to an outlet via a second channel. The second channel has a circular hole-like opening at one end of the groove chamber. The adjustment member is screwed into the valve body with an axially displaceable shaft. One end of the shaft that is located in the valve body has a cylindrical section, of which an end face has the same diameter as the opening of the second channel opening. The end face of the cylindrical section extends through the opening into the second channel. The cylindrical section has a slit, and the slit follows the cylindrical section to extend into the second channel to change the exposed length in the groove chamber, so as to control the flow of hydraulic oil through the slit.

Description

Flow control valve

The present invention relates to a flow control valve, and more particularly to a valve body structure for controlling the flow rate of hydraulic oil in a hydraulic circuit.

As shown in the eighth to the ninth, the flow control valve is a conventional valve control unit 8 and an adjusting member 9. The valve body 8 is connected to the first port 80, the main flow path 81, the first passage 82, the groove chamber 83, and the The two passages 84 and the second port 85, the adjusting member 9 is locked into the valve body 8 by the connecting seat 90, and is screwed into the connecting seat 90 by the shaft 91. The shaft 91 is exposed in the groove chamber 910 with the tapered portion 910. The end surface 911 of the tapered section 910 is smaller than the opening 840 of the second passage 84. The shaft 91 is axially displaceable when the connecting seat 90 is rotated, so that the shaft 91 extends into the opening 840 to the second passage 84 with its end surface 911.

Flow control of the hydraulic oil that will be pressurized into the valve body 8 from the first port 80 and bypassed by the first passage 82 into the chamber 83 and having a slope through the tapered section 910 A gap A (shown in FIG. 10) between the torus 912 and the opening 840 is passed through, and the gap A is permeable to a depth adjustment of the cone section 910 into the second passage 84, thereby controlling hydraulic oil by the first Two port 85 output flow control.

However, when the hydraulic oil passes through the gap A between the aforementioned toroid 912 and the opening 840, since the hydraulic oil itself has a viscosity, that is, the viscosity of the hydraulic oil is lower when the temperature is lower, and the temperature of the hydraulic oil is higher. The viscosity at a high time is low, so when the hydraulic oil flows through the torus 912, since the torus 912 has the entire circumference of the predetermined surface area, the torus 912 will generate resistance to the flow of the hydraulic oil, resulting in hydraulic pressure. The phenomenon of "stagnation" of oil, this "stagnation" phenomenon is more obvious when the viscosity of the hydraulic oil is higher, so that the hydraulic oil is less likely to pass through the gap A, and the hydraulic oil is easier to pass through the gap when the viscosity is low. A, the hydraulic oil changes its viscosity due to the difference in temperature, which will cause different "stagnation" phenomenon. The hydraulic oil will form a difficult gap through the gap A due to the "stagnation" phenomenon, which makes the control of the hydraulic oil flow unstable. The main problem that the present invention is intended to improve is.

The main object of the present invention is to solve the above problems and to provide a flow control valve, mainly when hydraulic oil flows from a tank chamber to a second passage, through a slit of a cylindrical section, and when hydraulic oil flows through a slit, hydraulic pressure The oil only contacts the relatively small side walls of the seam, so that the "stagnation" phenomenon of the hydraulic oil during the flow can be significantly reduced, and the flow control of the hydraulic oil can be relatively stable.

For the purposes of the foregoing, the present invention includes:

a valve body having an inlet connected to a main passage inside the valve body, the main passage being bypassed to a tank chamber via a first passage, the tank chamber being connected to an outlet through a second passage, the first The second channel has an opening having a circular hole shape at one end of the groove chamber;

An adjusting member is screwed into the valve body by a shaft, and one end of the shaft is located in the slot, and the other end of the shaft is located outside the valve body, and the shaft has a rotating portion at one end of the valve body to The rotating portion rotates the shaft and is axially displaced relative to the valve body, and the shaft has a cylindrical section of equal diameter at one end of the chamber, the cylindrical section having an end surface equal to the opening, the cylinder The segment has a counterbore recessed by the end surface, and an outer circumferential circumference of the cylindrical section and an inner peripheral wall closer to the counterbore have a slit communicating with the counterbore, the slit being opened by the end surface along the depth direction of the counterbore The cylindrical section extends coaxially and snugly into the opening into the second passage, the slit extending into the depth of the second passage with the cylindrical section to adjust the length of the slit exposed to the chamber.

The above and other objects and advantages of the present invention will be readily understood from

Of course, the invention may be varied on certain components, or in the arrangement of the components, but the selected embodiments are described in detail in the specification and their construction is shown in the drawings.

Referring to Figures 1 through 6, the structure of the embodiment selected for use in the present invention is for illustrative purposes only and is not limited by such structure in the patent application.

The embodiment provides a flow control valve, as shown in Figures 1 to 2, including a valve body 1 and an adjusting member 2, wherein:

As shown in FIG. 3, the valve body 1 has a first port 10, a main channel 11, a first channel 12, a slot chamber 13, a second channel 14, and a first port 15, and the main channel 11 The first port 12 and the second channel 14 are hidden inside the valve body 1, and the first port 10, the slot chamber 13 and the first port 15 respectively lead to the outside of the valve body 1, and the first port 10 is directed into the valve body 1. In the present embodiment, a backstop device is disposed in the main flow channel 11. The backstop device includes a ball 110 and a compression spring 111. The main channel 11 passes through the first body in the valve body 1. The passage 12 is bypassed to the slot chamber 13. The slot 13 is further communicated to the first port 15 via the second passage 14. The second passage 14 has an opening 140 at one end of the slot chamber 13. Round hole shape. The ball 110 and the compression spring 111 which are disposed in the main channel 11 are in the embodiment of the embodiment. The arrangement of the ball 110 and the compression spring 111 does not constitute an essential component of the present invention, and the scope of the patent application is interpreted. Not subject to the above description.

As shown in FIG. 3, the adjusting member 2 of the embodiment is screwed into a connecting seat 4 with an axial displacement of the shaft 3. The two ends of the shaft 3 extend out of the connecting base 4, respectively. One end has a rotating portion 30, the rotating portion 30 can be axially displaced in the connecting seat 4 by rotation, and the other end of the shaft 3 has a cylindrical portion 31, and the cylindrical portion 31 is waitable The diameter (that is, the diameter between the sections of the cylindrical section 31 is the same), and has an end surface 310 and the same diameter of the opening 140 as shown in FIGS. 3 to 4 (ie, the end surface 310 has the same diameter as the opening 140), The cylindrical section 31 has a counterbore 311 recessed by the end surface 310. In this embodiment, the center of the counterbore 311 is offset from the axis of the shaft 3, and the outer circumference 312 of the cylindrical section 31 and the counterbore 311 A relatively small inner peripheral wall 313 has a slit 314. The slit 314 communicates with the counterbore 311, and the slit 314 is opened by the end surface 310 along the deep direction of the counterbore 311.

As shown in FIGS. 4 to 5, the shaft 3 of the present embodiment, the cylindrical section 31 forms the two inner side walls 315 of the slit 314 as inclined surfaces, and the inner side walls 315 are in the inner peripheral wall 313 of the counterbore 311. One end is wider to form a wider opening 316, and one end of the outer circumference 312 of the cylindrical section 31 is narrower to form a narrower opening 317. The cylindrical section 31 forming the two inner side walls 315 of the slit 314 is a sloped surface, which is an embodiment of the embodiment, and is not a necessary condition for the formation of the slit 314 in the present invention, and is not limited by the above description when interpreting the scope of the patent application. .

As shown in FIG. 3, the flow control valve of the present invention is locked into the chamber 13 by the end of the connecting seat 4 extending from the cylindrical section 31, and is hermetically coupled to the valve body 1, the cylindrical section 31. And exposing in the trough chamber 13 , the cylindrical section 31 extends coaxially and closely into the opening 140 into the second passage 14 by the end surface 310 thereof, the slit 314 extending into the depth of the second passage 14 with the cylindrical section 31 To adjust the length of the slit 314 exposed in the chamber 13.

When the hydraulic oil is pressurized and flows into the valve body 1 from the first port 10, the hydraulic oil enters the main flow path 11 and flows into the groove chamber 13 via the bypass first flow path 12, at this time, the groove The chamber 13 is sealed by the connecting seat 4, so that hydraulic oil is injected into the counterbore 311 from the slit 314, and the hydraulic oil is output to the first port 15 via the second passage 14. As shown in Fig. 6, when the flow rate of the hydraulic oil is to be adjusted, the shaft 3 is axially displaced with respect to the joint 4 by rotating the rotating portion 30, and the length of the slit 314 exposed in the chamber 13 can be Adjust to the appropriate caliber.

If the slit 314 is compared with the gap A described by the conventional flow control valve, the slit 314 can be designed to have the same diameter as the gap A, and when the same hydraulic oil passes through the slit 314 and the gap A, Since the area of the hydraulic oil contacting the inner peripheral wall 313 in the slit 314 is smaller than the predetermined surface area of the entire circumferential surface of the conventional toroid 912, and the inner peripheral wall 313 is inclined, when the hydraulic oil enters the slit 314, The narrower opening 317 enters and enters the counterbore 311 through the wider opening 316, so that the resistance of the hydraulic oil flowing through the slit 314 by the inner peripheral wall 313 is relatively small, so the "stagnation" phenomenon is compared with the conventional one. The flow control valve is not obvious. At this time, the flow control valve of the present invention only needs to consider the influence of the viscosity change due to the high temperature and low temperature during the flow control of the hydraulic oil, and does not cause the flow due to the "stagnation" phenomenon of the hydraulic oil flow process. The control is unstable.

Of course, there are many examples of the invention, with only minor variations in the details. The second embodiment of the present invention has a different embodiment of the slit 314 of the cylindrical section 31 described in the first embodiment. Referring to FIG. 7, the cylindrical section 31A of the present embodiment has a slit 314A having an inner diameter width with respect to the axial direction of the shaft 3 as described in the first embodiment, and is largest at one end of the end surface 310A, and is away from the The other end of the end face 310A is the smallest, thereby achieving the same effect as the first embodiment.

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.

From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objects and is in accordance with the provisions of the Patent Law.

(customized part)

8. . . Valve body

80. . . First port

81. . . Mainstream road

82. . . First channel

83. . . Slot room

84. . . Second channel

840. . . Opening

85. . . Second port

9. . . Adjustment piece

90. . . Connecting seat

91. . . Shaft

910. . . Cone section

911. . . End face

912. . . Torus

A. . . gap

(part of the invention)

1. . . One valve body

10. . . First port

11. . . Mainstream road

110. . . Ball

111. . . compressed spring

12. . . First channel

13. . . Slot room

14. . . Second channel

140. . . Opening

15. . . First port

2. . . Adjustment piece

3. . . Shaft

30. . . Rotating part

31. . . Cylindrical section

310. . . End face

311. . . Counterbore

312. . . Outer ring week

313. . . Inner peripheral wall

314. . . Seam

315. . . Bevel

316. . . Opening

317. . . Opening

4. . . Connecting seat

Figure 1 is a perspective view of the three-dimensional combination of the present invention.

Fig. 2 is a perspective exploded view of the present invention.

Figure 3 is a schematic cross-sectional view of the present invention.

Figure 4 is an enlarged schematic view, partly in section, of the cylindrical section of Figure 2.

Fig. 5 is a schematic enlarged plan view showing the position of the slit at the end face of the cylindrical section of the present invention.

Figure 6 is a diagram in which the axial section of the present invention is axially displaced, and the cylindrical section is then changed in depth in the second flow path to adjust the length of the slit in the chamber.

Figure 7 is an enlarged schematic view showing a partial cross section of the second embodiment at a cylindrical section.

Figure 8 is a perspective exploded view of a conventional flow control valve.

Figure 9 is a schematic cross-sectional view of a conventional flow control valve.

Fig. 10 is a partially enlarged schematic view showing a gap formed between the taper section and the opening of the second flow path.

1. . . One valve body

12. . . First channel

13. . . Slot room

140. . . Opening

2. . . Adjustment piece

3. . . Shaft

30. . . Rotating part

31. . . Cylindrical section

310. . . End face

311. . . Counterbore

314. . . Seam

4. . . Connecting seat

Claims (7)

A flow control valve includes:
a valve body having an inlet connected to a main passage inside the valve body, the main passage being bypassed to a tank chamber via a first passage, the tank chamber being connected to an outlet through a second passage, the first The second channel has an opening having a circular hole shape at one end of the groove chamber;
An adjusting member is screwed into the valve body by a shaft, and one end of the shaft is located in the slot, and the other end of the shaft is located outside the valve body, and the shaft has a rotating portion at one end of the valve body to The rotating portion rotates the shaft and is axially displaced relative to the valve body, and the shaft has a cylindrical section of equal diameter at one end of the chamber, the cylindrical section having an end surface equal to the opening, the cylinder The segment has a counterbore recessed by the end surface, and an outer circumferential circumference of the cylindrical section and an inner peripheral wall closer to the counterbore have a slit communicating with the counterbore, the slit being opened by the end surface along the depth direction of the counterbore The cylindrical section extends coaxially and snugly into the opening into the second passage, the slit extending into the depth of the second passage with the cylindrical section to adjust the length of the slit exposed to the chamber. The flow control valve according to claim 1, wherein the adjusting member comprises a connecting rod, the shaft is axially displaceably screwed into the connecting seat, and one end of the shaft extends out of the connecting seat In combination with the rotating portion, the other end of the shaft protrudes from the connecting seat to have the cylindrical portion, and the connecting seat is locked into the groove chamber at an end protruding from the cylindrical portion. The flow control valve according to the first aspect of the invention, wherein the two inner side walls of the cylindrical section forming the slit are inclined surfaces, and the inner side walls are wider at one end of the inner peripheral wall of the counterbore to form a wider width. The opening is narrower at one end of the outer circumference of the cylindrical section to form a narrower opening. The flow control valve according to claim 1, wherein the slit has the same inner diameter of the axial direction of the shaft. The flow control valve according to claim 1, wherein the inner diameter of the slit relative to the axial direction of the shaft is largest at one end of the end face and smallest at the other end away from the end face. The flow control valve according to claim 1, wherein a check device is disposed in the main flow channel, and the check device comprises a ball and a compression spring. The flow control valve of claim 1, wherein the center of the counterbore is offset from the axis of the shaft.