Poppet valve and poppet valve device having the same

Abstract

The snap valve includes a housing including a valve passage having a first passage portion and a second passage portion, a valve seat interposed between the first passage portion and the second passage portion, and a valve hole having a back pressure chamber into which an upstream pressure of the valve passage is introduced, and a valve body which is slidably accommodated in the valve hole between a closed position in which the valve body is seated on the valve seat to close the valve passage and an open position in which the valve body opens the valve passage at an opening degree corresponding to a stroke amount, the valve body including a valve main body having a valve portion seated on the valve seat at a tip end side and being slidably provided in the valve hole, and a cylindrical valve head portion protruding from the valve portion inside the first passage portion, the valve head portion having a plurality of slots passing through the valve head portion in an inner-outer direction, and a sliding portion in which the plurality of slots are formed, the sliding portion being slidably accommodated in the first passage portion.

Description

Technical Field

[0001] This disclosure relates to a poppet valve for regulating the opening of a valve passage and a poppet valve device having the poppet valve. Background Technology

[0002] As a lifting valve for regulating the opening of the valve passage, a flow control valve, such as the one described in Patent Document 1, is known. The flow control valve of Patent Document 1 includes a valve body slidably disposed in the housing. The valve body closes the inlet-side passage and the outlet-side passage by placing the valve portion onto the valve seat. On the other hand, the valve body opens the inlet-side passage and the outlet-side passage by moving the valve portion away from the valve seat, and opens the valve passage to an opening degree corresponding to the stroke amount.

[0003] Existing technical documents: Patent documents: Patent Document 1: Japanese Patent Application Publication No. 2022-166300. Summary of the Invention

[0004] The problem the invention aims to solve: In the flow control valve of Patent Document 1, a cylindrical protrusion, known as a valve head, is provided on the tip side of the valve body. The valve head protrudes from the inlet passage. Furthermore, an annular groove extending circumferentially is formed on the outer circumferential surface of the valve head, adjacent to the tip side of the valve body. A fixed throttling section is formed in the annular groove. Therefore, in the flow control valve, after the valve body just leaves the valve seat, the inlet passage and the outlet passage are connected to each other via the fixed throttling section and the annular groove. As a result, the opening area between the inlet passage and the outlet passage, i.e., the opening area of ​​the valve passage, increases sharply after the valve body just leaves the valve seat. Consequently, the flow of the working fluid increases sharply after the valve body just leaves the valve seat. On the other hand, for a lift valve, flow control in a smaller flow range is desired. To achieve flow control in a small flow range in a lift valve, it is necessary to suppress the sharp increase in the opening area of ​​the valve passage after the valve body just leaves the valve seat.

[0005] Therefore, the object of the present invention is to provide a lifting valve that can suppress the sharp increase in the opening area of ​​the valve passage after the valve body has just left the valve seat.

[0006] Solution methods: The lifting valve of the present invention comprises: a housing including a valve passage having a first passage portion and a second passage portion, a valve seat disposed between the first passage portion and the second passage portion, and a valve orifice having a back pressure chamber into which an upstream pressure is introduced into the valve passage; and a valve body slidably received in the valve orifice between a closed position in which the valve passage is closed by sitting on the valve seat and an open position in which the valve passage is opened by an opening degree corresponding to the stroke amount, and the valve body being stroked according to the back pressure of the back pressure chamber, the valve body comprising: a valve body having a valve portion at a tip end that sits on the valve seat and is slidably disposed in the valve orifice, and a cylindrical valve head that protrudes from the valve portion into the first passage portion, the valve head having a plurality of slots penetrating the valve head in an inward and outward direction, and a sliding portion having the plurality of slots formed thereon, the sliding portion being slidably received in the first passage portion.

[0007] According to the present invention, the valve head is cylindrical and protrudes into the first passage portion. Furthermore, the valve head has multiple slots extending through the valve head in the inward and outward directions, and a sliding portion having the multiple slots formed thereon. The sliding portion is slidably accommodated within the first passage portion. Therefore, the gap between the first passage portion and the sliding portion can be reduced. This prevents a sharp increase in the opening area of ​​the valve passage immediately after the valve part leaves the valve seat, and allows control of the opening area of ​​the valve passage based on the opening degree of the slots. Therefore, the opening degree of the valve passage can be controlled with a smaller opening degree.

[0008] The lifting valve device of the present invention includes: the lifting valve described above; and a slide valve for discharging pressurized fluid from the back pressure chamber, wherein the slide valve discharges the pressurized fluid from the back pressure chamber by performing a stroke, thereby adjusting the back pressure, and the lifting valve adjusts the opening degree of the valve passage according to the back pressure.

[0009] According to the present invention, a lifting valve device having the functions described above can be realized.

[0010] Invention effects: According to the present invention, it is possible to suppress the sharp increase in the opening area of ​​the valve passage immediately after the valve body leaves the valve seat.

[0011] The above-mentioned objects, other objects, features, and advantages of the present invention will become clear from the following detailed description of preferred embodiments with reference to the accompanying drawings. Attached Figure Description

[0012] Figure 1 A cross-sectional view of the lifting valve device of this embodiment is shown; Figure 2 To show in magnified form Figure 1 An enlarged cross-sectional view of the lifting valve equipped with the lifting valve device; Figure 3 To show in Figure 2An enlarged cross-sectional view of the main valve body in the lifting valve during its full stroke. Figure 4 To show in magnified form Figure 2 A three-dimensional view of the valve head of the lifting valve; Figure 5 To show in magnified form Figure 2 An enlarged cross-sectional view near the valve head of the lifting valve; Figure 6 An enlarged cross-sectional view of the lifting valve provided with the lifting valve device of the second embodiment is shown in an enlarged manner. Figure 7 An enlarged cross-sectional view of the lifting valve provided with the lifting valve device of the third embodiment is shown in an enlarged manner. Figure 8 An enlarged perspective view of the valve body of the lifting valve equipped with a lifting valve device according to other embodiments; Figure 9 An enlarged perspective view of the valve body of a lifting valve equipped with a lifting valve device according to yet another embodiment. Detailed Implementation

[0013] Hereinafter, with reference to the above-mentioned accompanying drawings, the lifting valve devices 1, 1A, 1B and their equipped lifting valves 2, 2A, 2B of the first to third embodiments of this disclosure will be described. Furthermore, the directional concepts used in the following description are for ease of explanation only and are not intended to limit the structural orientation of the invention to these directions. Also, the lifting valve devices 1, 1A, 1B and lifting valves 2, 2A, 2B described below are only one embodiment of this disclosure. Therefore, this disclosure is not limited to any particular embodiment, and additions, deletions, and modifications can be made without departing from the spirit of the invention.

[0014] <First Implementation> [Lifting valve device] Figure 1 The lifting valve device 1 shown controls the flow rate of the working fluid according to the energizing state (e.g., current or voltage). The lifting valve device 1 is installed, for example, in construction machinery such as excavators. The lifting valve device 1 controls the flow rate of the working fluid flowing to the hydraulic actuator equipped on the construction machinery according to the energizing state. The lifting valve device 1 includes, for example, a lifting valve 2 and an electric spool valve 4.

[0015] [Lift valve] Figure 2 As detailed later, the lifting valve 2 shown has a housing 10, and adjusts the opening of the valve passage 12 formed in the housing 10. More specifically, the lifting valve 2 adjusts the opening of the valve passage 12 according to the back pressure, as detailed later. Thus, the lifting valve 2 allows the working fluid to flow at a flow rate corresponding to the back pressure. Further detailed, the lifting valve 2 includes a main valve body 14, a check valve body 15, and a spring member 16 for the main valve.

[0016] The housing 10 has a valve hole 11, a valve passage 12, and a valve seat 13. The valve hole 11 is a bottomed hole extending along a defined axis L1. The main valve body 14, which will be described in detail later, is received in the valve hole 11. The valve passage 12 is formed in the housing 10 such that the valve hole 11 is disposed therein. More specifically, the valve passage 12 includes a first passage portion 12a and a second passage portion 12b. The first passage portion 12a has a valve port 11a opening in the bottom surface of the valve hole 11 and is connected to the valve hole 11 via the valve port 11a. In this embodiment, the first passage portion 12a extends from the valve port 11a in a first direction. Furthermore, the first direction is the direction in which the axis L1 of the valve hole 11 extends. The valve seat 13 is disposed between the first passage portion 12a and the second passage portion 12b. In this embodiment, the valve seat 13 is formed in the bottom surface of the valve hole 11 such that it surrounds the valve port 11a. On the other hand, the second passage portion 12b opens on the inner circumferential surface of the bottom portion of the valve hole 11 and is connected to the valve hole 11. Thus, the first passage portion 12a and the second passage portion 12b are respectively connected to the valve hole 11 and connected to each other via the valve hole 11. In this embodiment, in the valve passage 12, the working fluid flows from the first passage portion 12a to the second passage portion 12b via the valve hole 11.

[0017] Furthermore, the valve orifice 11 has a back pressure chamber 11c. The back pressure chamber 11c is supplied with upstream pressure from the valve passage 12, which in this embodiment is the first passage portion 12a. More specifically, the back pressure chamber 11c is a space formed in the valve orifice 11 by the main valve body 14, described in detail later, and is located on the opposite side of the valve port 11a in the first direction within the valve orifice 111. That is, in the valve orifice 111, the valve port 11a is located on one side of the first direction, and the back pressure chamber 11c is located on the other side of the first direction. Furthermore, the valve orifice 11 has an annular passage portion 11d. The annular passage portion 11d is an annular groove recessed radially outward from the axial middle portion of the valve orifice 11. The back pressure chamber 11c is connected to the first passage portion 12a via the feedback flow path 14a, described in detail later, and the annular passage portion 11d.

[0018] As an example of a valve body, the main valve body 14, such as... Figure 2 As shown, the main valve body 14 is slidably disposed in the valve port 11. More specifically, the main valve body 14 is slidably disposed in the valve port 11 along a first direction. Further detailed, the main valve body 14 is slidably disposed in the valve port 11 between a closed position and an open position. The closed position is the position where the main valve body 14 is seated on the valve seat 13 and the valve port 11a is closed (i.e., the valve passage 12 is closed). On the other hand, the open position is the position where the main valve body 14 is removed from the valve seat 13 and the valve port 11a is opened (i.e., the valve passage 12 is opened) (see reference). Figure 3Furthermore, in the open position, valve port 11a opens to an opening degree corresponding to the stroke of the main valve body 14. Thus, the main valve body 14 opens and closes valve port 11a by sliding along the first direction, while simultaneously adjusting the opening degree of valve passage 12 according to its position. More specifically, the main valve body 14 includes a valve body 17 and a valve head 18.

[0019] The valve body 17 is slidably disposed in the valve port 11. The valve body 17 has a valve portion 17a at its tip. The valve portion 17a sits on the valve seat 13, thereby closing the valve port 11a. In this embodiment, the valve portion 17a is formed in a tapered shape. However, the valve portion 17a does not necessarily have to be tapered; it can also be formed in a flat shape.

[0020] like Figure 4 and Figure 5 As shown, the valve head 18 is formed in a cylindrical shape and protrudes within the first passage portion 12a. More specifically, the valve head 18 constitutes the tip-end portion of the main valve body 14, extending axially from the valve portion 17a. Here, axial refers to the direction in which the axis of the main valve body 14 extends, which in this embodiment is the same direction as the first direction. The valve head 18 thus configured has a sliding portion 18a and a plurality of notches 18b. Further detailed, the valve head 18 has a guided portion 18c.

[0021] The sliding portion 18a is slidably accommodated within the first passage portion 12a. More specifically, the sliding portion 18a is annular, and in this embodiment, it is circular. Furthermore, the sliding portion 18a is accommodated within the first passage portion 12a in a manner that is substantially without gap between it and the first passage portion 12a throughout the entire circumference. In this embodiment, a very small gap (i.e., a sliding gap) of 5 μm to 50 μm is formed between the sliding portion 18a and the first passage portion 12a. This suppresses the flow of working fluid between the sliding portion 18a and the first passage portion 12a.

[0022] Multiple slots 18b are formed in the sliding portion 18a. In this embodiment, six slots 18b are formed in the sliding portion 18a at equal intervals along the circumferential direction. However, the number of slots 18b is not limited to six; it can be five or fewer, or seven or more. The multiple slots 18b penetrate the valve head 18 in the inward and outward directions. Each slot 18b is, for example, a semi-circular cut and opens at the tip of the valve head 18. That is, the valve portion 17a side of the slot 18b is formed in an arc shape and opens axially. Furthermore, the shape of the slot 18b described above is an example; it can also be an arc shape, an ellipse, a U-shape, or other shapes, as long as the valve portion side is arc-shaped. Also, the slots 18b are arranged in the sliding portion 18a away from the valve portion 17a in a first direction. However, the slots 18b can also be arranged adjacent to the valve portion 17a in the first direction.

[0023] The guided portion 18c is formed in the valve head 18 at the tip of the sliding portion 18a. More specifically, the guided portion 18c extends axially from the sliding portion 18a. Furthermore, the guided portion 18c protrudes into the first passage portion 12a during the full stroke of the main valve body 14, when it is furthest from the valve seat 13. Therefore, even during the full stroke of the main valve body 14, the tip of the main valve body 14 will not disengage from the first passage portion 12a. A gap d is left between the guided portion 18c and the first passage portion 12a. The gap d is, for example, 0.3 mm or more and 0.5 mm or less. That is, the guided portion 18c moves radially inward away from the first passage portion 12a. More specifically, the outer peripheral surface of the guided portion 18c is formed with a radius of curvature smaller than the outer diameter of the sliding portion 18a. Therefore, the outer peripheral surface of the valve head 18 is formed in a stepped shape relative to the minor diameter of the sliding portion 18a.

[0024] Furthermore, the guided portion 18c in this embodiment is configured as follows: The guided portion 18c has a plurality of feet 18d. The plurality of feet 18d are formed circumferentially spaced apart from each other on the tip side of the sliding portion 18a. More specifically, the feet 18d are formed on the tip side of the sliding portion 18a between two adjacent slots 18b. In this embodiment, four feet 18d are formed on the tip side of the sliding portion 18a. Two of the four feet 18d are staggered by 180 degrees from each other. That is, the sliding portion 18a has formed portions 18e on the tip side where feet 18d are formed, and non-formed portions 18f where feet 18d are not formed. In this embodiment, the sliding portion 18a has four formed portions 18e and two non-formed portions 18f. Both the formed portions 18e and the non-formed portions 18f are located between two adjacent slots 18b, and the two non-formed portions 18f are positioned staggered by 180 degrees from each other. Therefore, the main valve body 14, by having feet 18d, can be stably guided even after the sliding portion 18a has disengaged from the first passage portion 12a. Furthermore, in the main valve body 14, a larger opening is formed between two adjacent feet 18d at the non-forming portion 18f. More specifically, at the non-forming portion 18f, an opening is formed between two adjacent feet 18d, and this opening has a width equal to the sum of the widths of the two slots 18b and the non-forming portion 18f. Therefore, a larger flow rate of working fluid flows through this opening in the guided portion 18c.

[0025] Furthermore, the main valve body 14, as Figure 2As shown, a back pressure chamber 11c is formed in the valve port 11. More specifically, the back pressure chamber 11c is separated from the main valve body 14 in the valve port 11 and formed on the opposite side of the valve port 11a in the first direction. As described above, the upstream pressure of the valve passage 12 is introduced into the back pressure chamber 11c. Furthermore, the main valve body 14 bears the hydraulic pressure, i.e., back pressure, of the back pressure chamber 11c in the first direction (i.e., the closed direction, which is the direction of closing the valve passage 12). More specifically, the main valve body 14 has a feedback flow path 14a leading to the back pressure chamber 11c, through which the upstream pressure of the valve passage 12 is introduced into the back pressure chamber 11c via the feedback flow path 14a and the annular passage portion 11d. That is, the feedback flow path 14a guides the working fluid from the first passage portion 12a to the back pressure chamber 11c. More specifically, the feedback flow path 14a has an internal passage portion 14b and multiple side notches 14c.

[0026] An internal passage 14b is formed inside the main valve body 14 and is connected to the first passage 12a. More specifically, the internal passage 14b is formed in the valve body 17. Furthermore, the internal passage 14b opens at the tip of the valve body 17 into the inner hole 18g of the valve head 18. Thus, the internal passage 14b is connected to the first passage 12a via the inner hole 18g of the valve head 18, and working fluid is introduced into the internal passage 14b via the inner hole 18g. A plurality of side slots 14c are spaced apart and arranged in the middle portion of the outer peripheral surface of the main valve body 14, and are connected to the internal passage 14b. More specifically, each of the side slots 14c is connected to the internal passage 14b via radially extending branch passages 14d. Each side slot 14c is correspondingly arranged with an annular passage 11d and is connected to the back pressure chamber 11c via the annular passage 11d.

[0027] The check valve body 15 opens and closes the feedback flow path 14a. More specifically, the check valve body 15 is slidably disposed within the main valve body 14. A check valve seat 14e is formed in the internal passage portion 14b. The check valve seat 14e is located in the internal passage portion 14b on the tip side (i.e., upstream side) compared to each branch passage portion 14d. The check valve body 15 can be seated in the check valve seat 14e. By being seated in the check valve seat 14e, the check valve body 15 closes the feedback flow path 14a (see reference). Figure 2 ), opening the feedback flow path 14a by exiting from the check valve seat 14e (see reference) Figure 3 Furthermore, the check valve body 15 is subjected to hydraulic pressure from the working fluid flowing from the first passage portion 12a to the back pressure chamber 11c, and is forced against the check valve seat 14e in a manner that resists the hydraulic pressure. Thus, the check valve body 15 allows the flow of the working fluid from the first passage portion 12a to the back pressure chamber 11c, and prevents its reverse flow.

[0028] The main valve spring member 16 applies force to the main valve body 14 in the closed position. More specifically, the main valve spring member 16 is a compression coil spring. The main valve spring member 16 is housed in a compressed state within the back pressure chamber 11c. In this embodiment, the back pressure chamber 11c is closed by the housing 21, which will be described in detail later. The main valve spring member 16 abuts against both the housing 21 and the main valve body 14, and is housed in a compressed state within the back pressure chamber 11c. Consequently, the main valve body 14 is forced in the closed direction, i.e., in the direction of the valve seat 13.

[0029] [Electric slide valve] Electric slide valve 4 is also like Figure 1 As shown, it is installed in the housing 10. More specifically, the electric slide valve 4 is installed in the housing 10 in such a way that it closes the valve orifice 11 (more specifically, the back pressure chamber 11c). The electric slide valve 4 is energized, and its opening degree is adjusted according to the energization state. In this embodiment, the electric slide valve 4 discharges the pressurized fluid from the back pressure chamber 11c. Furthermore, the electric slide valve 4 changes its opening degree according to the energization state, thereby adjusting the back pressure of the back pressure chamber 11c. The electric slide valve 4 thus configured includes a housing 21, a valve core 22, an electric actuator 23, and a spring member 24.

[0030] Housing 21 is disposed on housing 10. More specifically, housing 21 is disposed on housing 10 in a manner that closes valve port 11. Housing 21 as... Figure 1 As shown, it has a valve core hole 31, an inlet side flow path 32, and an outlet side flow path 33.

[0031] The valve core 22 is slidably accommodated in the valve core orifice 31. In this embodiment, the valve core orifice 31 extends in the housing 21 along a second direction. The second direction is, for example, a direction orthogonal to the first direction. More specifically, the valve core orifice 31 penetrates the housing 21 along the second direction. One side of the valve core orifice 31 in the second direction is closed by the spring support 25, and the other side in the second direction is closed by the electric device 23. The inlet-side flow path 32 and the outlet-side flow path 33 are respectively connected to the valve core orifice 31. The inlet-side flow path 32 is connected to the back pressure chamber 11c, and the valve core orifice 31 is connected to the back pressure chamber 11c. On the other hand, the outlet-side flow path 33 is connected to the second passage portion 12b of the valve passage 12. More specifically, the housing 10 has a connecting passage 10a, and the outlet-side flow path 33 is connected to the second passage portion 12b via the connecting passage 10a.

[0032] The valve core 22 is slidably inserted into the valve core hole 31. More specifically, the valve core 22 opens and closes the inlet-side flow path 32 and the outlet-side flow path 33 by performing a stroke. Furthermore, during its stroke, the valve core 22 adjusts the opening between the inlet-side flow path 32 and the outlet-side flow path 33 to a degree corresponding to the stroke amount.

[0033] The electric actuator 23 causes the valve core 22 to travel. More specifically, the electric actuator 23 is mounted on the housing 21 in a manner that closes the opening on the other side of the valve core bore 31 in the second direction. The electric actuator 23 is an electrically driven direct-acting device that causes the valve core 22 to travel in the second direction by applying a load corresponding to the energized state to the valve core 22. The electric actuator 23 can be, for example, a direct-acting solenoid or a ball screw motor. In this embodiment, the electric actuator 23 is a direct-acting solenoid.

[0034] The spring member 24 applies a force to the valve core 22 in the second direction. More specifically, the spring member 24 applies a force to the valve core 22 against a load from the electric device 23. The spring member 24 is, for example, a compression coil spring. The spring member 24 is housed in a compressed state on one side of the valve core bore 31 in the second direction. Thus, the valve core 22 is subjected to a force by the spring member 24 in the second direction.

[0035] [Action of the valve lifting device] In the lifting valve device 1, when the electric slide valve 4 is energized, it operates as follows: In the electric slide valve 4, the valve core 22 moves in the second direction, opening the inlet-side flow path 32 and the outlet-side flow path 33. Consequently, the pressurized fluid in the back pressure chamber 11c of the lifting valve 2 flows from the inlet-side flow path 32 through the outlet-side flow path 33, and further discharges via the connecting passage 10a to the second passage portion 12b of the valve passage 12. On the other hand, in the lifting valve 2, because the pressurized fluid is discharged from the back pressure chamber 11c, the feedback flow path 14a, which was closed by the check valve body 15, is opened (see reference). Figure 3 Then, the working fluid is introduced from the first passage portion 12a of the valve passage 12 through the feedback flow path 14a and the annular passage portion 11d, and through the gap between the main valve body 14 and the valve orifice 11 into the back pressure chamber 11c (see reference). Figure 3 (Thick line in the image). At this time, due to the pressure loss at the side slot 14c, the pressure in the back pressure chamber 11c, i.e., the back pressure, is reduced. As a result, the main valve body 14 is lifted to a position where the back pressure and the upstream pressure of the valve passage 12 are balanced with the force applied by the main valve spring member 16.

[0036] The back pressure is a pressure corresponding to the ratio of the opening area of ​​the side slot 14c to the opening degree between the inlet-side flow path 32 and the outlet-side flow path 33. Therefore, the main valve body 14 is raised by an amount corresponding to the ratio of the opening area of ​​the side slot 14c to the opening degree between the inlet-side flow path 32 and the outlet-side flow path 33. Since the opening degree between the inlet-side flow path 32 and the outlet-side flow path 33 is controlled to correspond to the energized state of the electric slide valve 4, the main valve body 14 is raised by an amount corresponding to the energized state of the electric slide valve 4. Therefore, in the lifting valve device 1, for example, the flow rate flowing in the valve passage 12 can be controlled based on the characteristics of the main valve body opening area relative to the amount of lifting.

[0037] To further explain, when the electric slide valve 4 is energized and the main valve body 14 disengages from the valve seat 13, the lifting valve 2 operates as follows: In the lifting valve 2, the valve head 18 slides along the first passage portion 12a while disengaging from the valve seat 13. Furthermore, multiple slots 18b are formed in the sliding portion 18a. Therefore, in the lifting valve 2, immediately after disengagement (more specifically, before the slots 18b reach the valve port 11a), the opening area of ​​the valve passage 12 can be suppressed to approximately the cross-sectional area of ​​the sliding gap, i.e., a small area. Thus, the sharp increase in the opening area of ​​the valve passage 12 immediately after disengagement can be prevented in the lifting valve 2.

[0038] Furthermore, after the slots 18b reach the valve port 11a, the valve passage 12 opens with an opening area corresponding to the area of ​​the portion of the multiple slots 18b exposed from the valve port 11a to the valve hole 11, i.e., the exposed area. More specifically, in the lifting valve 2, the exposed area of ​​the multiple slots 18b increases according to the stroke of the main valve body 14. Therefore, in the lifting valve 2, the valve passage 12 can be opened with an opening area corresponding to the stroke of the main valve body 14. Thus, the lifting valve device 1 can allow the working fluid, at a flow rate corresponding to the energized state of the electric slide valve 4, to flow from the first passage portion 12a to the second passage portion 12b.

[0039] Furthermore, in the lifting valve 2, in this embodiment, the plurality of slots 18b are formed in a semi-circular shape. Therefore, after reaching the valve port 11a, the portion of the slot 18b exposed to the valve hole 11 is formed in an arc shape, allowing the exposed area of ​​the plurality of slots 18b to increase slowly. This also prevents the opening area of ​​the valve passage 12 from increasing sharply immediately after it leaves the seat. On the other hand, after the sliding portion 18a disengages from the valve port 11a into the valve hole 11, due to the presence of the non-formed portion 18f, a larger opening area can be ensured in the valve passage 12. As a result, when a large flow rate of working fluid flows in the valve passage 12, pressure loss generated in the working fluid can be suppressed.

[0040] Furthermore, in the lifting valve 2, even when the main valve body 14 is in its full stroke state, the guided portion 18c of the valve head 18 remains within the first passage portion 12a. Therefore, it is possible to prevent the main valve body 14 from dislodging from the first passage portion 12a. This prevents the main valve body 14 from failing to sit on the valve seat 13 and thus failing to close the valve passage 12. In particular, in this embodiment, the guided portion 18c has four legs 18d, and each pair of legs 18d is staggered by 180 degrees. This allows the main valve body 14 to move along the first passage portion 12a via the four legs 18d.

[0041] In the lifting valve 2 of the first embodiment, the valve head 18 is cylindrical and protrudes into the first passage portion 12a. Furthermore, the valve head 18 has a plurality of slots 18b extending through the valve head 18 in the inward and outward directions, and a sliding portion 18a having the plurality of slots 18b formed thereon. The sliding portion 18a is slidably accommodated within the first passage portion 12a. Therefore, the gap between the first passage portion 12a and the sliding portion 18a can be reduced. This prevents a sharp increase in the opening area of ​​the valve passage 12 immediately after the valve portion 17a leaves the valve seat 13, and allows control of the opening area of ​​the valve passage 12 based on the opening degree of the slots 18b. Therefore, the opening degree of the valve passage 12 can be controlled with a smaller opening degree.

[0042] Furthermore, in the lifting valve 2 of the first embodiment, the guided portion 18c protrudes from the first passage portion 12a when the main valve body 14 is in its full stroke. Therefore, even when the main valve body 14 is in its full stroke, the valve head 18 will not disengage from the first passage portion 12a. As a result, the guided portion 18c can be guided through the first passage portion 12a, allowing the main valve body 14 to reposition itself onto the valve seat 13. Therefore, it is possible to prevent the main valve body 14 from failing to reposition itself onto the valve seat 13.

[0043] Furthermore, in the lifting valve 2 of the first embodiment, the sliding portion 18a has a forming portion 18e and a non-forming portion 18f. Therefore, a larger opening can be formed between adjacent feet 18d at the non-forming portion 18f. As a result, after the sliding portion 18a disengages from the first passage portion 12a, a larger flow rate of working fluid can flow through the opening between the feet 18d. Therefore, the pressure loss of the working fluid can be reduced.

[0044] Furthermore, in the lifting valve 2 of the first embodiment, the guided portion 18c has a gap d between it and the first passage portion 12a. Therefore, even after the sliding portion 18a disengages from the first passage portion 12a, the working fluid can still flow between the guided portion 18c and the first passage portion 12a. This allows for the flow of more working fluid, thus reducing pressure loss. Also, after the sliding portion 18a disengages from the first passage portion 12a, the sliding resistance of the main valve body 14 is reduced, allowing the main valve body 14 to move smoothly. This improves controllability in high-flow-rate areas.

[0045] Furthermore, in the lifting valve 2 of the first embodiment, the valve portion 17a side of the plurality of slots 18b is formed in an arc shape. Therefore, as the slots 18b gradually open, they open in an arc shape, thereby making it easy to perform fine control over the opening area of ​​the slots 18b. As a result, flow control can be performed in a smaller flow range in the lifting valve 2.

[0046] In the lifting valve device 1 of the first embodiment, the lifting valve device 1 can realize the functions described above.

[0047] <Second Implementation> Figure 6 The lifting valve device 1A and lifting valve 2A of the second embodiment shown are structurally similar to those of the lifting valve device 1 and lifting valve 2 of the first embodiment. Therefore, for the structures of the lifting valve device 1A and lifting valve 2A of the second embodiment, the differences from those of the lifting valve device 1 and lifting valve 2 of the first embodiment will be mainly described, and the same symbols will be used for the same structures and the descriptions will be omitted. The same applies to the third embodiment and the like described below.

[0048] Figure 6 The lifting valve device 1A shown in the second embodiment includes, for example, a housing 10, a lifting valve 2A, and an electric slide valve 4 (not shown). The lifting valve 2A includes a main valve body 14A, a check valve body 15, and a main valve spring member 16. The main valve body 14A includes a valve body 17 and a valve head 18A. The valve head 18A has a sliding portion 18a, a guided portion 18Ac, and a plurality of slots 18Ab. The guided portion 18Ac extends axially from the sliding portion 18a in the valve head 18 and protrudes into the first passage portion 12a in the full stroke state of the main valve body 14 when it is furthest from the valve seat 13. In this embodiment, the guided portion 18Ac is cylindrical, similar to the sliding portion 18a. A plurality of slots 18Ab are formed integrally with the valve head 18. That is, the slots 18Ab are also formed in the guided portion 18Ac. Furthermore, the slots 18Ab are, for example, circular, and their valve portion 17a side is arc-shaped. In this embodiment, the groove 18Ab formed in the guided portion 18Ac has a smaller diameter than the groove 18Ab formed in the sliding portion 18a.

[0049] The lifting valve device 1A and lifting valve 2A of the second embodiment achieve the same effect as the lifting valve device 1 and lifting valve 2 of the first embodiment.

[0050] <Third Implementation Method> Figure 7 The lifting valve device 1B of the third embodiment shown includes, for example, a housing 10, a lifting valve 2B, and an electric slide valve 4 (not shown). The lifting valve 2B includes a main valve body 14B, a check valve body 15, and a main valve spring member 16. The main valve body 14B includes a valve body 17 and a valve head 18B. The valve head 18B has a sliding portion 18a, a guided portion 18c, and a plurality of slots 18b, 18Bb.

[0051] The first slot 18b is the same as the slot 18b in the first embodiment, for example, it is formed in a semi-circular shape and is formed away from the valve portion 17a towards the tip. The second slot 18Bb, like the first slot 18b, extends through the valve head 18 in the inward and outward directions. The second slot 18Bb is formed, for example, in a circular shape. More specifically, the second slot 18Bb is disposed on the sliding portion 18a between the first slot 18b and the valve portion 17a, and is arranged at intervals along the circumference. In this embodiment, four slots 18b and 18Bb are formed on the sliding portion 18a, and are arranged alternately at intervals along the circumference. Furthermore, on the tip side of the sliding portion 18a, between two adjacent first slots 18b, forming portions 18e and non-forming portions 18f are alternately arranged, and a guided portion 18c is formed in the forming portion 18e. Furthermore, the outer peripheral surface of the guided portion 18c is formed into a cone shape that tapers towards the tip. That is, the outer peripheral surface of the foot 18d slopes radially inward as it moves toward the tip.

[0052] In the lifting valve 2B of the third embodiment, the outer peripheral surface of the guided portion 18c is inclined radially inward. Therefore, the opening area between the guided portion 18c and the first passage portion 12a can be gradually increased. As a result, the sharp increase in opening area after the sliding portion 18a disengages from the first passage portion 12a can be suppressed.

[0053] In addition, the lifting valve device 1B and lifting valve 2B of the third embodiment achieve the same effect as the lifting valve device 1 and lifting valve 2 of the first embodiment.

[0054] <Other Implementation Methods> In the lifting valve devices 1, 1A, and 1B of this embodiment, the working fluid flows from the first passage portion 12a to the second passage portion 12b in the valve passage 12, but it can also flow from the second passage portion 12b to the first passage portion 12a. In this case, the second passage portion 12b becomes the upstream side of the valve passage 12, and the feedback flow path 14a of the main valve body 14 is connected to the second passage portion 12b. Furthermore, in the main valve body 14B of the lifting valve 2B, the circular second slots 18Bb are arranged between adjacent slots 18b, but it can also flow as... Figure 8 As shown, the valve head 18C of the main valve body 14C is formed into a longitudinally elongated rounded rectangle extending from the sliding portion 18a to the foot 18d. Alternatively, it can be as follows... Figure 9 As shown in the figure, the valve head 18D of the main valve body 14D has two second slots 18Bb arranged between the first slots 18b, and a third slot 18Db may also be formed on the foot 18d.

[0055] Furthermore, in the lifting valves 2, 2A, and 2B of this embodiment, the sliding portion 18a is connected to the valve portion 17a, but the sliding portion 18a can also be formed away from the valve portion 17a. In this case, in the closed position, the main valve body 14 is configured such that the working fluid is not introduced between the sliding portion 18a and the valve portion 17a. In the main valve bodies 14, 14A, and 14B, the foot 18d is away from the first passage portion 12a, but the foot 18d can also slide along the first passage portion 12a. Also, the valve heads 18, 18A, and 18B of the main valve bodies 14, 14A, and 14B do not necessarily have guided portions 18c and 18Ac. In addition, the sliding portion 18a does not necessarily have a non-forming portion 18f.

[0056] <Exemplary Implementation> The first aspect of the lifting valve comprises: a housing including a valve passage having a first passage portion and a second passage portion, a valve seat disposed between the first passage portion and the second passage portion, and a valve orifice having a back pressure chamber into which an upstream pressure is introduced into the valve passage; and a valve body slidably received in the valve orifice between a closed position where it is seated on the valve seat and closes the valve passage and an open position where it opens the valve passage with an opening degree corresponding to the stroke amount, and the valve body being stroked according to the back pressure of the back pressure chamber, the valve body comprising: a valve body having a valve portion at a tip end that is seated on the valve seat and slidably disposed in the valve orifice, and a cylindrical valve head protruding from the valve portion into the first passage portion, the valve head having a plurality of slots penetrating the valve head in an inward and outward direction, and a sliding portion having the plurality of slots formed thereon, the sliding portion being slidably received in the first passage portion.

[0057] Based on the above aspects, the valve head is cylindrical and protrudes into the first passage portion. Furthermore, the valve head has multiple slots extending through it in the inward and outward directions, and a sliding portion formed with these slots. The sliding portion is slidably accommodated within the first passage portion. Therefore, the gap between the first passage portion and the sliding portion can be reduced. Consequently, the sharp increase in the opening area of ​​the valve passage after the valve part has just left the valve seat can be suppressed, and the opening area of ​​the valve passage can be controlled according to the opening degree of the slots. Therefore, the opening degree of the valve passage can be controlled with a smaller opening degree.

[0058] In the second aspect of the lifting valve, the valve head further has a guided portion formed on the tip side of the sliding portion, the guided portion protruding into the first passage portion in the full stroke state of the valve body when it is furthest from the valve seat.

[0059] Based on the above, the guided portion protrudes from the first passage portion when the valve body has completed its full stroke. Therefore, even when the valve body has completed its full stroke, the valve head will not disengage from the first passage portion. Thus, the guided portion can be guided through the first passage portion, allowing the main valve body to reseat on the valve seat. Therefore, it is possible to prevent the valve body from failing to seat on the valve seat.

[0060] The third aspect of the lifting valve, in the second aspect of the lifting valve, the guided portion has a plurality of feet formed in the sliding portion, the plurality of slots being arranged spaced apart from each other in the sliding portion, the sliding portion having forming portions where the feet are formed and non-forming portions where the feet are not formed between adjacent slots.

[0061] Based on the above aspects, the sliding portion has a forming portion and a non-forming portion. Therefore, a larger opening can be formed between adjacent feet at the non-forming portion. Consequently, after the sliding portion disengages from the first passage portion, a larger flow rate of working fluid can flow through the opening between the feet. Therefore, the pressure loss of the working fluid can be reduced.

[0062] In the fourth aspect of the lifting valve, in the second or third aspect of the lifting valve, the guided portion has a gap between it and the first passage portion.

[0063] Based on the above aspects, a gap is created between the guided portion and the first passage portion. Therefore, even after the sliding portion disengages from the first passage portion, the working fluid can still flow between the guided portion and the first passage portion. As a result, since more working fluid can flow, the pressure loss of the working fluid can be reduced. Furthermore, after the sliding portion disengages from the first passage portion, the sliding resistance of the valve body can be reduced, thereby allowing the valve body to move smoothly. This improves controllability in high-flow-rate areas.

[0064] The fifth aspect of the lifting valve, in the fourth aspect of the lifting valve, has the outer peripheral surface of the guided portion inclined radially inward toward the tip side.

[0065] Based on the above aspects, the outer peripheral surface of the guided portion is inclined radially inward. Therefore, the opening area between the guided portion and the first passage portion can be gradually increased. Consequently, it is possible to suppress a sharp increase in the opening area after the sliding portion disengages from the first passage portion.

[0066] The sixth aspect of the lifting valve, in any of the first to fifth aspects of the lifting valve, has the valve portion of the plurality of slots formed in an arc shape.

[0067] Based on the above, the valve-side portion of the multiple slots is formed in an arc shape. Therefore, when the valve body leaves the valve seat and the slots open, the slots gradually open in an arc shape, thereby facilitating fine control over the opening area of ​​the slots. This allows for flow control within a smaller flow range during valve operation.

[0068] The seventh aspect of the lifting valve device includes: a lifting valve as described in any one of the first to sixth aspects; and a slide valve for discharging pressurized fluid from the back pressure chamber, the slide valve discharging the pressurized fluid from the back pressure chamber by performing a stroke, thereby adjusting the back pressure, and the lifting valve adjusting the opening of the valve passage according to the back pressure.

[0069] Based on the above aspects, a lifting valve device can be implemented that has the functions described above.

[0070] Based on the foregoing description, many improvements and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the foregoing description should be interpreted as illustrative only, intended to teach those skilled in the art the best mode for carrying out the invention. Details that can substantially change the structure and / or function of the invention without departing from its spirit may be included.

Claims

1. A lifting valve, characterized in that, have: A housing comprising a valve passage having a first passage portion and a second passage portion, a valve seat disposed between the first passage portion and the second passage portion, and a valve port having a back pressure chamber into which an upstream pressure is introduced into the valve passage; and A valve body, which is slidably received in the valve orifice between a closed position where it is seated on the valve seat and closes the valve passage, and an open position where it opens the valve passage to an extent corresponding to the stroke, and the stroke is adjusted according to the back pressure of the back pressure chamber. The valve body includes: a valve body having a valve portion at its tip end that sits on the valve seat and is slidably disposed in the valve hole; and a cylindrical valve head that protrudes from the valve portion into the first passage portion. The valve head has multiple slots extending through the valve head in the inward and outward directions, and a sliding portion formed with the multiple slots. The sliding portion is slidably accommodated within the first passage portion.

2. The lifting valve according to claim 1, characterized in that, The valve head also has a guided portion formed on the tip side of the sliding portion. The guided portion protrudes into the first passage portion during the full stroke of the valve body when it is furthest from the valve seat.

3. The lifting valve according to claim 2, characterized in that, The guided portion has a plurality of feet formed in the sliding portion. The plurality of slots are arranged at intervals between each other in the sliding portion. The sliding portion has a forming portion in which the foot is formed between adjacent slots, and a non-forming portion in which the foot is not formed.

4. The lifting valve according to claim 2, characterized in that, The guided portion leaves a gap between itself and the first passage portion.

5. The lifting valve according to claim 4, characterized in that, The outer peripheral surface of the guided portion is inclined radially inward toward the tip side.

6. The lifting valve according to claim 1, characterized in that, The portion of the valve side of the plurality of slots is formed in an arc shape.

7. A lifting valve device, characterized in that, have: The lifting valve as claimed in claim 1; and The slide valve that discharges the pressurized fluid from the back pressure chamber. The slide valve discharges pressurized fluid from the back pressure chamber by performing a stroke, thereby regulating the back pressure. The lifting valve adjusts the opening degree of the valve passage according to the back pressure.

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