JP6017850B2 - valve - Google Patents

Description

  The present invention relates to a valve for opening and closing a fluid flow path. The present invention is effective when applied to a counter balance valve.

  For example, in the valve described in Patent Document 1, a valve seat portion on which a valve body is seated is provided in a valve seat that is a separate part from the valve body.

JP 2002-130500 A

  By the way, normally, in the valve, there is a pressure difference between one side and the other side across the valve port, that is, the valve seat portion. For this reason, when the pressure difference is large, a valve seat member such as a valve seat may move relative to the valve body.

  If the valve seat member moves relative to the valve body integrally with the valve body, the valve body may remain seated on the valve seat portion. And in such a case, there exists a possibility that the malfunction that a valve port may remain substantially obstruct | occluded may generate | occur | produce.

  In view of the above points, an object of the present invention is to suppress the occurrence of a problem that a valve opening remains substantially closed in a valve in which the valve seat member is separate from the valve body.

  In order to achieve the above object, the present invention partitions the first pressure chamber (11A) and the second pressure chamber (11B), and the first pressure chamber (11A) side and the second pressure chamber (11B) side. A valve body (11) having a partition part (11C) and provided with a communication hole (13B) for communicating the first pressure chamber (11A) side and the second pressure chamber (11B) side in the partition part (11C) A valve body (19) that is provided on the first pressure chamber (11A) side and adjusts the communication state between the first pressure chamber (11A) side and the second pressure chamber (11B) side, and a communication hole (13B) And a valve seat member (21B) having a valve seat (21B) on which the valve body (19) is seated and a valve port (21A) that press-fits the first pressure chamber (11A) and the second pressure chamber (11B). ) And the valve seat member (21), and communicates with the second pressure chamber (11B) side and a communication hole (1 Characterized in that it comprises an inner circumferential surface (first opening that opens toward the @ 13 C) (25A) relief channel having a B) and (25).

  Thereby, in this invention, since the 1st opening part (25A) is opened toward the internal peripheral surface (13C) of a communicating hole (13B), the press-fitted valve seat member (21) is the said press-fitting position. The first opening (25A) is closed by the inner peripheral surface (13C). That is, in this state, the state is similar to that of a conventional valve in which no escape passage (25) is provided.

  However, when the pressure in the second pressure chamber (11B) is larger than the first pressure chamber (11A), the pressure difference between the second pressure chamber (11B) and the first pressure chamber (11A) is excessively large for some reason. There is a case. In such a case, since the force that presses the valve seat member (21) toward the first pressure chamber (11A) increases, the valve seat member (21) moves toward the first pressure chamber (11A) side. May end up.

  And even if it is a case where a valve-seat member (21) moves with respect to a partition part (11C) integrally with a valve body (19), in this invention, the 2nd pressure chamber (11B) side and 1st The pressure chamber (11A) side can be communicated.

  That is, when the valve seat member (21) moves to the first pressure chamber (11A) side, in the present invention, the first opening (25A) is opened to the space on the first pressure chamber (11A) side. Can be. Therefore, the second pressure chamber (11B) side and the first pressure chamber (11A) side can be communicated with each other.

  As described above, according to the present invention, in the valve in which the valve seat member (21) is a separate body from the valve body (11), the valve port (21A) remains substantially closed. Can be suppressed.

In the present invention, “adjusting the communication state” refers to a case where the valve opening (21A) is simply opened or closed, a case where the opening degree of the valve opening (21A) is changed continuously or stepwise, and the like.
Incidentally, the reference numerals in parentheses for each of the above means are examples showing the correspondence with the specific means described in the embodiments described later, and the present invention is indicated by the reference numerals in the parentheses of the above respective means. It is not limited to specific means.

It is a figure which shows the hydraulic control circuit to which the valve | bulb which concerns on this invention is applied. It is sectional drawing which shows the structure of the valve | bulb part which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the operation state of FIG. It is a figure which shows the state which the valve-seat member 21 has moved in the valve | bulb part which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of the valve | bulb part which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the valve | bulb part which concerns on 3rd Embodiment of this invention.

  The “embodiment of the invention” described below shows an example of the embodiment. In other words, the invention specific items described in the claims are not limited to the specific means and structures shown in the following embodiments.

In this embodiment, the valve according to the present invention is applied to a counter balance valve. Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows a hydraulic control circuit using a counter balance valve 10 according to the present embodiment. The hydraulic control circuit controls the operating pressure of the actuator 1 using fluid pressure such as a hydraulic cylinder.

  The hydraulic control circuit shown in FIG. 1 is the same as the hydraulic control circuit described in, for example, Japanese Patent Application Laid-Open No. 2004-308746, and each component constituting the hydraulic control circuit shown in FIG. -1 (2007) and JIS B 0125-2 (2001). Therefore, the description of the hydraulic control circuit is only a brief description.

1. Hydraulic control circuit (see Fig. 1)
The hydraulic pump 2 sucks the working oil stored in the tank 2A and discharges the sucked working oil. The direction control valve 3 switches the connection relationship between the hydraulic pump 2 and the counter balance valve 10. Incidentally, the direction control valve 3 according to the present embodiment is a manual type.

  The relief valve 4 is a safety valve that suppresses an increase in the discharge pressure by connecting the discharge side and the suction side of the hydraulic pump 2 when the discharge pressure of the hydraulic pump 2 becomes equal to or higher than a predetermined pressure. .

  Then, by switching the connection relationship between the hydraulic pump 2 and the counter balance valve 10, the actuator 1, that is, the hydraulic cylinder is (a) extended, (b) reduced, and (c) extended or reduced. The case where a state is held can be switched.

2. 2. Counter Balance Valve 2.1 Overview of Counter Balance Valve As shown in FIG. 2, the valve body 11 is provided with a partition portion 11C that partitions the inside of the valve body 11 into a first pressure chamber 11A and a second pressure chamber 11B. ing. The first pressure chamber 11A is connected to the hydraulic pump 2 side, and the second pressure chamber 11B is connected to the actuator 1 side.

  The valve body 11 according to the present embodiment is made of cast iron. The spaces in the valve body 11 such as the first pressure chamber 11A and the second pressure chamber 11B are formed as casting holes when the valve body 11 is cast, and then formed through a finishing process by machining such as cutting. The For this reason, the partition part 11 </ b> C according to the present embodiment is a part integrally formed with the valve body 11.

  Further, the partition portion 11C is provided with a first communication hole 13A and a second communication hole 13B that allow the first pressure chamber 11A side and the second pressure chamber 11B side to communicate with each other. The first communication hole 13A and the second communication hole 13B are cylindrical spaces whose inner peripheral surfaces are configured by the partition portions 11C.

  The second pressure chamber 11B communicates with a first connection port 11D and a second connection port 11E provided in the valve body 11. The first connection port 11D is connected to the extension-side oil chamber 1A (see FIG. 1) side of the actuator 1. The second connection port 11E is connected to the reduction-side oil chamber 1B (see FIG. 1) side of the actuator 1.

  Then, the hydraulic oil discharged from the hydraulic pump 2 flows into the extension-side oil chamber 1A via the first communication hole 13A and the first connection port 11D, and the actuator 1 is extended. Although the volume of the reduction side oil chamber 1B is reduced as the expansion side oil chamber 1A expands, the hydraulic oil corresponding to the reduced volume is supplied to the tank 2A via the flow path 1C (see FIG. 1). Return.

  A check valve 15 is provided in the first communication hole 13A. The check valve 15 allows hydraulic oil to flow from the first pressure chamber 11A side to the second pressure chamber 11B side, and allows the hydraulic oil to flow from the second pressure chamber 11B side to the first pressure chamber 11A side. Is prohibited.

  The check valve 15 includes a valve body 15A, a valve seat 15B on which the valve body 15A is seated, and a valve port 15E that communicates with the first pressure chamber 11A and the second pressure chamber 11B. The valve seat 15C and the spring 15D that presses the valve body 15A against the valve seat 15C are provided. The valve seat 15C is press-fitted into the first communication hole 13A from the second pressure chamber 11B side.

  Further, when the actuator 1 is contracted, that is, when hydraulic fluid flows from the actuator 1 side to the tank 2A side, the hydraulic fluid flows into the second pressure chamber 11B from the first connection port 11D and then the third connection. It flows out from the port 11F to the tank 2A side.

  That is, when the second communication hole 13B, that is, a later-described valve port 21A is opened, the hydraulic fluid on the actuator 1 side flows into the second pressure chamber 11B from the first connection port 11D and then passes through the third connection port 11F. And flows out to the tank 2A side. In the present embodiment, the valve according to the present invention is applied to the valve portion 17 that controls the communication state of the second communication hole 13B.

2.2 Details of valve section <Structure of valve section>
The valve unit 17 includes a valve body 19, a valve seat member 21, a spring 23, and the like. The valve seat member 21 communicates the valve port 21A for communicating the first pressure chamber 11A and the second pressure chamber 11B, the valve seat portion 21B on which the valve body 19 is seated, and the valve port 21A and a throttle 29A described later. It has a communication port 21C. The valve seat member 21 is press-fitted into the second communication hole 13B from the first pressure chamber 11A side.

  The valve seat member 21 is press-fitted and fixed to the extent that it does not move relative to the partition portion 11C as long as the pressure difference between the first pressure chamber 11A and the second pressure chamber 11B is within a predetermined specification range. . Further, the valve seat member 21 is made of a metal material (for example, carbon steel) having higher toughness than the valve body 11.

  The valve body 19 is disposed on the first pressure chamber 11A side, and can be displaced so as to be separated from the valve seat portion 21B. And the connection state of the 1st pressure chamber 11A side and the 2nd pressure chamber 11B side is adjusted by the valve body 19 separating / connecting with respect to the valve seat part 21B. That is, as shown in FIG. 3, when the valve body 19 is separated from the valve seat portion 21B, the valve port 21A is opened. On the other hand, as shown in FIG. 2, when the valve body 19 contacts the valve seat portion 21B, the valve port 21A is closed.

  The valve seat member 21 is provided with at least one escape passage 25. The escape passage 25 is a fluid passage having a first opening 25A on one end side and the other end communicating with the second pressure chamber 11B side. The first opening 25A opens toward the inner peripheral surface 13C of the second communication hole 13B.

  The valve seat member 21 according to the present embodiment is a cylindrical body formed in a cylindrical shape. The relief passage 25 according to the present embodiment communicates the outer peripheral surface side of the valve seat member 21 and the inner peripheral surface side of the valve seat member 21.

  That is, the relief flow path 25 is configured by a through hole that penetrates the valve seat member 21 in the radial direction. For this reason, the second opening 25 </ b> B that opens on the second pressure chamber 11 </ b> B side in the escape passage 25 is open on the inner peripheral surface of the valve seat member 21.

  The valve body 19 includes a valve portion 19B and a contact portion 19C. The valve portion 19B has a conical tapered surface 19A that is in contact with the valve seat portion 21B. The contact portion 19C is provided at the tip of a columnar portion extending from the valve portion 19B in a direction away from the valve port 21A on the first pressure chamber 11A side.

  As shown in FIG. 3, the contact portion 19C contacts the stopper portion 27A provided in the valve body 11 when the valve portion 19B is separated from the valve seat portion 21B, thereby cooperating with the stopper portion 27A. It works to stop the movement of the valve body 19.

  The stopper portion 27A according to the present embodiment is provided on the inner wall surface of the plug 27 that closes the processing hole. Incidentally, the processed hole is a hole formed when machining the second communication hole 13B or the like. A sealing material 27B such as an O-ring is disposed in the gap between the plug 27 and the valve body 11.

  Further, a piston portion 19D is provided on the side opposite to the contact portion 19C with respect to the valve portion 19B, that is, on the second pressure chamber 11B side. The piston portion 19D is displaced integrally with the valve portion 19B, and partitions the second pressure chamber 11B into a back pressure chamber 11G and a pilot pressure chamber 11H. The O-ring 19E is a seal part that partitions the pilot pressure chamber 11H side and the back pressure chamber 11G side in a liquid-tight manner.

  The back pressure chamber 11G is a pressure chamber provided on the valve portion 19B side with respect to the piston portion 19D, and communicates with the first connection port 11D side via the first throttle portion 29A. The pilot pressure chamber 11H is a pressure chamber provided on the side opposite to the back pressure chamber 11G across the piston portion 19D, and communicates with the second connection port 11E side via the second throttle portion 29B.

  In addition, a regulating portion 11J is provided on the second pressure chamber 11B side of the partition portion 11C, that is, on the back pressure chamber 11G side of the second communication hole 13B. The restricting portion 11J restricts the valve seat member 21 from moving to the second pressure chamber 11B side, that is, the back pressure chamber 11G side by contacting the valve seat member 21.

  Note that the restricting portion 11J according to the present embodiment is configured by hook-shaped protrusions protruding from the inner peripheral surface 13C toward the center in the entire inner peripheral surface 13C of the second communication hole 13B. That is, the second pressure chamber 11 </ b> B side of the second communication hole 13 </ b> B is formed in a stepped shape, and the restricting portion 11 </ b> J is configured by the stepped portion.

  The spring 23 is an elastic member that is disposed on the first pressure chamber 11A side and exhibits an elastic force that presses the valve portion 19B against the valve seat portion 21B. Therefore, when the force acting on the piston portion 19D based on the pressure of the pilot pressure chamber 11H, that is, the force pressing the valve portion 19B toward the first pressure chamber 11A exceeds the elastic force, the valve portion 19B It moves to the 27A side and the valve opening 21A opens.

<Operation of counter balance valve>
When the discharge pressure of the hydraulic pump 2 is acting on the third connection port 11F, the valve portion 19B is pressed against the valve seat portion 21B by the discharge pressure in addition to the elastic force, so the valve port 21A is closed. It becomes a state.

  The valve seat member 21 is press-fitted into the second communication hole 13B, and the first opening 25A is closed by the inner peripheral surface 13C of the second communication hole 13B, and therefore the second communication hole 13B. The hydraulic oil does not flow through the mating surface between the valve seat member 21 and the valve seat member 21.

  For this reason, since the pressure in the first pressure chamber 11A is higher than the pressure in the second pressure chamber 11B, the hydraulic oil sent from the hydraulic pump 2 passes through the check valve 15 and the first connection port 11D. It flows into the extension side oil chamber 1A. On the other hand, the hydraulic oil in the reduction side oil chamber 1B returns to the tank 2A via the flow path 1C.

  Further, when the third connection port 11F is connected to the tank 2A side, the pressure in the first pressure chamber 11A decreases to the pressure on the tank 2A side. The operating oil discharged from the hydraulic pump 2 is introduced into the reduction-side oil chamber 1B via the flow path 1C, and is introduced into the pilot pressure chamber 11H via the second throttle portion 29B. Acts on the piston portion 19B.

  And since the force which acts on piston part 19D and presses valve part 19B to the 1st pressure chamber 11A side exceeds the elastic force of spring 23, valve part 19B separates from valve seat part 21B, and valve mouth 21A opens . For this reason, the hydraulic oil in the extension side oil chamber 1A returns to the tank 2A from the first connection port 11D via the throttle 29A and the third connection port 11F.

3. Features of Valve Part According to this Embodiment In this embodiment, the inner peripheral surface 13C of the second communication hole 13B is in a state where the press-fitted valve seat member 21 is held at the press-fitting position shown in FIGS. The first opening 25A that opens toward the end is closed by the inner peripheral surface 13C. That is, in this state, a state similar to that of the valve in which the escape passage 25 is not provided is obtained.

  However, when the pressure difference between the second pressure chamber 11B and the first pressure chamber 11A becomes excessively large for some reason, the force that presses the valve seat member 21 toward the first pressure chamber 11A increases, and therefore, as shown in FIG. Thus, the valve seat member 21 may move to the first pressure chamber 11A side.

  At this time, in this embodiment, since the escape passage 25 is provided, the valve seat member 21 is moved to the first pressure chamber 11A side, and the first opening 25A is on the first pressure chamber 11A side. It can be made into the state opened toward the space of.

  As described above, in the present embodiment, even if the valve seat member 21 moves relative to the partition portion 11C integrally with the valve portion 19B, the second pressure chamber 11B side and the first pressure chamber 11A side are communicated. Therefore, in the valve portion 17 in which the valve seat member 21 is separate from the valve body 11, it is possible to suppress the occurrence of a problem that the valve port 21A remains substantially closed.

  In the present embodiment, even if the valve seat member 21 moves relative to the partition portion 11C integrally with the valve portion 19B, the second pressure chamber 11B side and the first pressure chamber 11A side are reliably communicated. Accordingly, as shown in FIGS. 2 and 3, the first dimension A is made smaller than the second dimension B.

Here, the 1st dimension A means the dimension from the edge part (henceforth a pressure chamber side edge part) by the side of the 1st pressure chamber 11A among division parts 11C to the edge of the 1st opening 25A.
That is, the edge of the first opening 25A refers to an edge close to the pressure chamber side end in a state where the valve seat member 21 is in the press-fitting position as shown in FIG. The first dimension A is a dimension measured from the pressure chamber side end to the edge of the first opening 25A along the press-fitting direction of the valve seat member 21.

  The second dimension B is a dimension measured along the moving direction of the contact part 19C from the contact part 19C to the stopper part 27A in a state where the valve body 19 is seated on the valve seat part 21B. In the present embodiment, the moving direction of the contact portion 19C, that is, the valve body 19, and the press-fitting direction of the valve seat member 21 coincide with each other.

  Moreover, in this embodiment, the regulation part 11J which regulates that the valve seat member 21 contacts the valve seat member 21 and moves to the second pressure chamber 11B side on the second pressure chamber 11B side in the partition part 11C. Is provided. Thereby, the valve seat member 21 can be press-fitted while being positioned easily.

  Further, in the present embodiment, the valve body 11 is made of cast iron having excellent machinability and castability, and the valve seat member 21 is made of carbon steel having excellent toughness. Therefore, while improving the workability of the counterbalance valve 10, Manufacturing costs can be reduced.

(Second Embodiment)
In the first embodiment, the relief flow path 25 is configured by a through hole that penetrates the valve seat member 21 in the radial direction, and therefore the second opening that opens on the second pressure chamber 11B side in the relief flow path 25. The portion 25 </ b> B was opened on the inner peripheral surface of the valve seat member 21.

  On the other hand, as shown in FIG. 5, the relief flow path 25 according to the present embodiment is not a through hole that penetrates the valve seat member 21 in the radial direction, but a first opening on the outer peripheral surface of the valve seat member 21. This is constituted by a groove extending from the portion 25A to the back pressure chamber 11G side. For this reason, the second opening 25B does not open on the inner peripheral surface of the valve seat member 21, but continues to the communication port 21C and opens at the end of the valve seat member 21 on the back pressure chamber 11G side. .

(Third embodiment)
In the present embodiment, as shown in FIG. 6, a counterbore 11K is provided on the first pressure chamber 11A side in the partition portion 11C. Accordingly, the first dimension A according to the present embodiment is a dimension from the bottom surface 11L of the counterbore 11K to the edge of the first opening 25A.

  The escape passage 25 shown in FIG. 6 has the same shape as the escape passage 25 according to the first embodiment. However, the present invention is not limited to this, and the second embodiment relates to the second embodiment. It may have the same shape as the escape passage 25.

(Other embodiments)
In the above-described embodiment, the valve according to the present invention is applied to the counter balance valve. However, the application of the present invention is not limited to this and can be applied to valves for other purposes.

  In the above-described embodiment, the valve element 19 is pressed against the valve seat portion 21B by the spring 23. However, the present invention is not limited to this. For example, the valve element 19 is valved using electromagnetic force or the like. You may press against the seat part 21B.

Moreover, in the above-mentioned embodiment, although the contact part 19C and the stopper part 27A were provided and the movement amount of the valve body 19 was controlled, this invention is not limited to this.
In the above case, the contact part 19C and the stopper part 27A may be eliminated. Therefore, when the contact part 19C and the stopper part 27A are eliminated, the first dimension A is equal to the second dimension B. Not specified in relationship.

  That is, if the valve seat member 21 moves with respect to the partition portion 11C, if the second pressure chamber 11B side and the first pressure chamber 11A side can be communicated with each other via the escape passage 25, The relationship between the first dimension A and the second dimension B is not limited to the above relationship.

Moreover, although the stopper portion 27A according to the above-described embodiment is provided on the inner wall surface of the plug 27 that closes the machining hole, the present invention is not limited to this.
Moreover, in the above-mentioned embodiment, although the control part 11J was provided, this invention is not limited to this, You may abbreviate | omit the control part 11J.

  In the above-described embodiment, the valve body 11 is a casting. However, the present invention is not limited to this, and the valve body 11 may be formed by cutting out the material constituting the valve body 11.

  In the above-described embodiment, the valve body 11 and the partition portion 11C are integrally formed. However, the present invention is not limited to this, and for example, the valve body 11 and the partition portion 11C are separated. After the formation, the partition portion 11C may be integrated with the valve body 11. In this case, the partition portion 11C and the valve seat member 21 may be formed separately and then integrated, or the valve seat member 21 and the partition portion 11C may be formed integrally.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 10 ... Counter balance valve 11 ... Valve body 11A ... 1st pressure chamber 11B ... 2nd pressure chamber 11C ... Partition part 11D ... 1st connection port 11E ... 2nd connection port 11F ... 3rd connection port 11G ... Back pressure chamber 11H ... Pilot pressure chamber 11J ... Restriction part 11L ... Bottom 13A ... First communication hole 13B ... Second communication hole 13C ... Inner peripheral surface 15 ... Check valve 15A ... Valve body 15B ... Valve seat part 15C ... Valve seat 17 ... Valve part 19 ... Valve body 19A ... Conical taper surface 19B ... Valve part 19C ... Contact part 19D ... Piston part 21 ... Valve seat member 21A ... Valve port 21B ... Valve seat part 25 ... Relief channel 25A ... First opening 25B ... Second Opening 27 ... Plug 27A ... Stopper 27B ... Sealing material 29A ... First throttle 29B ... Second throttle

Claims (6)

A first pressure chamber, a second pressure chamber, and a partition section partitioning the first pressure chamber side and the second pressure chamber side, wherein the partition section includes the first pressure chamber side and the second pressure chamber; A valve body provided with a communication hole for communicating with the side;
A valve body that is provided on the first pressure chamber side and adjusts a communication state between the first pressure chamber side and the second pressure chamber side;
A valve seat member having a valve seat that is press-fitted into the communication hole and communicates between the first pressure chamber and the second pressure chamber, and a valve seat portion on which the valve body is seated;
An escape passage provided in the valve seat member and communicating with the second pressure chamber side and having a first opening that opens toward an inner peripheral surface of the communication hole , wherein the first opening is And a relief channel closed on the inner peripheral surface . Provided with a stopper portion that is provided in the valve body and stops the movement of the valve body by contacting a contact portion provided in the valve body when the valve body is separated from the valve seat portion;
Of the partition part, the dimension from the end on the first pressure chamber side to the edge of the first opening is called a first dimension, and the dimension from the contact part to the stopper is called a second dimension. When
The valve according to claim 1, wherein the first dimension is smaller than the second dimension.   3. The valve according to claim 1, wherein the valve seat member is formed in a cylindrical shape, and the first opening is opened at an outer peripheral surface of the valve seat member.   4. The valve according to claim 3, wherein a second opening portion that opens on the second pressure chamber side in the escape passage opens on an inner peripheral surface of the valve seat member. 5. The valve seat member is press-fitted into the communication hole from the first pressure chamber side,
Further, a regulating portion that regulates movement of the valve seat member toward the second pressure chamber by contacting the valve seat member is provided on the second pressure chamber side of the partition portion. The valve according to any one of claims 1 to 4, wherein:   6. The valve according to claim 1, wherein an elastic member that exerts an elastic force that presses the valve body against the valve seat portion is provided on the first pressure chamber side. .

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