JP6444108B2 - Fluid coupling - Google Patents

Description

  The present invention relates to a fluid coupling usable for a check valve, and more particularly to a fluid coupling suitable for ultra-high pressure.

  Conventionally, for example, a pump disclosed in Patent Document 1 is known as a check valve (check valve) used in an extremely high pressure fluid ultrahigh pressure generator. The check valve check body 14 of the check valve includes a flange portion whose diameter suddenly increases at the center. The check valve body 14 is sandwiched and coupled to the pump housing 35. The poppet 19 has a substantially cylindrical shape.

Japanese translation of PCT publication No. 2006-509171 (FIG. 2)

Since the check valve body constituting the conventional check valve is fixed to the pump housing with the flange portion interposed therebetween, stress concentrates on the rapidly expanding portion of the cross section. This stress becomes a tensile stress. For this reason, the conventional valve seat has a problem in that cracks are generated starting from the stress concentration site and are easily damaged.
Similar problems were common to fluid couplings that connect piping to pressure vessels. In particular, in a high-pressure vessel having a high pressure or a high-pressure vessel having a high pressure amplitude and frequency, there has been a problem that the body of the joint is easily damaged.

  Further, the suction valve and the discharge valve have a problem that the valve seat surface is easily damaged because the valve element repeatedly opens and closes. When the valve seat surface is damaged once and the fluid leaks from the damaged portion, the flow rate of the leaked fluid is high, and the valve seat surface or the valve body is worn by the leaked fluid. In addition, due to fluid leakage, cavitation occurs upstream of the valve, and the flow path inside the check valve body is damaged.

  This invention is made | formed in view of such a background, and makes it a subject to provide the fluid coupling which reduced the load to the main body of a fluid coupling, and improved durability.

In order to solve the above problems, the present onset Ming, a fluid coupling disposed in the pressure vessel, comprising: a body, a through passage in which the fluid communication to the pressure vessel flows, one side of the body Formed in the pressure vessel and arranged to be engaged with the inner surface of the pressure vessel. The first cylindrical portion is provided in the first cylindrical portion, and has a smaller diameter than the first cylindrical portion. packing installation portion, and an engaging portion having a packing disposed on the gasket installation portion, and a conical surface formed on the other side, from the engaging portion between the engaging portion and the conical surface and diameter has been enlarged diameter portion also includes a cross-sectional enlarged portion sectional toward the enlarged diameter portion from said engaging portion is enlarged, a body having a a accepted member, same as in the previous SL conical surface of opening has a receiving portion having a tapered surface which is above the angle, a flow passage communicating with the other side of said through-passage, wherein the pressure Disposed in the container, said conical surface of the body is brought into contact with the tapered surface of the receiving member, and a receiving member for supporting the body, wherein the pressure container has a notch on the front end surface, wherein The pressure vessel and the main body are partitioned by the enlarged cross-sectional portion and the cutout portion, and are formed so that the pressure vessel and the main body do not directly or indirectly contact each other in the axial direction. A gap is provided.

  In the fluid coupling, the pressure in the pressure vessel acts on the main body from one side and the force obtained by multiplying the cross-sectional area of the portion inserted into the pressure vessel of the main body is received by the receiving member. According to such a configuration, since the conical surface of the main body and the tapered surface of the receiving portion have the same groove angle, the fluid coupling receives a force due to the pressure in the pressure vessel over the entire tapered surface of the receiving member. . In the reaction, the receiving member gives the main body a force which is perpendicular to the conical surface of the main body and is evenly directed from the periphery to the central portion. On the other hand, the same pressure as that in the pressure vessel acts on the through passage. The pressure applied in the through passage tends to push the main body from the center in the radially outer circumferential direction. Due to the force acting from the outer periphery and the force acting from the inside, a substantially uniform compressive stress acts on the entire body. In the fluid coupling, since there is no portion where the cross section of the main body rapidly expands, stress concentration hardly occurs.

Moreover, according to this structure, a diameter expansion part does not contact with a pressure vessel inner surface. The body receives a force obtained by the product of the pressure in the pressure vessel and the cross-sectional area of the pressure vessel. This force acts from the tapered portion of the main body to the direction in which the receiving member is removed from the pressure vessel, that is, to the other side, through the tapered surface of the receiving member. The receiving member is coupled to the pressure vessel with a greater coupling force than this force. If the fluid pressure in the pressure vessel is very high, this coupling force can be a force that deforms the body. Since the enlarged diameter portion does not contact the inner surface of the pressure vessel, the coupling force between the receiving member and the pressure vessel does not act on the main body. For this reason, in the fluid coupling, only the internal stress generated by the fluid pressure acts on the main body, and the durability of the main body is improved.

  The engaging portion includes a first cylindrical portion fitted inside the pressure vessel, a packing installation portion having a smaller diameter than the first cylindrical portion, and a packing disposed in the packing installation portion. And are preferably provided.

  According to such a configuration, the main body is in a state where the main body and the inner surface of the pressure vessel are coaxially arranged by fitting the first cylindrical portion formed on the suction port side into the inner surface of the pressure vessel. Can be assembled. The main body has a smaller diameter than the first cylindrical portion on the suction port side, and a packing installation portion that is inserted into the inner surface of the pressure vessel is formed, so that the packing can be disposed in the packing installation portion. . For this reason, the pressure caused by the ultrahigh pressure fluid stored in the pressure vessel is prevented from acting on the central portion of the main body on the discharge side from the portion where the packing installation portion of the main body is formed. be able to. The ultra-high pressure fluid in the pressure vessel is blocked by packing. The cross-sectional area with which the ultrahigh pressure fluid comes into contact is the outer diameter of the packing, that is, the inner diameter of the pressure vessel. Since the ultra-high pressure fluid does not act on the enlarged diameter portion of the main body having a larger cross-sectional area than the inner diameter of the pressure vessel, the forward force due to the pressure received by the main body can be reduced. Since this force acts on the receiving member, the force for coupling the receiving member can be reduced.

The main body has a second cylindrical portion at a front end portion on the other side, and the receiving member has a receiving portion into which the second cylindrical portion is inserted, and the receiving portion includes the first cylindrical portion. It is preferable that the main body is supported by restricting the cylindrical portion 2.
According to this configuration, the fluid coupling can place the main body and the receiving member at an accurate position by fitting the second cylindrical portion of the main body into the receiving portion of the receiving member. By correctly arranging the main body and the receiving member, the point of action of the force received by the main body from the receiving member and the force received by the main body from the pressurized fluid are matched. In the fluid coupling, the point of action exactly matches, so that the compressive stress acting inside the main body is more uniformly distributed, and the durability of the main body is improved.

Preferably, the main body has a stepped surface continuously formed on the front side of the second cylindrical portion, a reduced diameter portion formed on an axial base side end portion of the stepped surface, and a front side of the reduced diameter portion. A discharge-side small-diameter portion that is continuously formed.
According to this configuration, since the main body has a reduced diameter portion formed between the step surface and the second cylindrical portion, there is no portion where the cross section of the main body rapidly expands, and therefore stress concentration hardly occurs. It is possible to suppress the occurrence of cracks and cracks.

Moreover, it is preferable that a valve body housing member is provided, and the valve body housing member is inserted into the housing portion and disposed at a position where an end portion of the valve body housing member abuts on the reduced diameter portion .
According to this configuration, the valve body housing member is inserted into the housing portion in a state where the end of the valve body housing member is in contact with the reduced diameter portion.

The pressure vessel is a cylinder of a piston pump, and the main body has a supply port to which the fluid is supplied, and a suction port for discharging the fluid supplied from the supply port to one side into the cylinder. And the through passage has an inflow port through which the fluid pressurized in the cylinder flows into the one side, and a discharge port through which the fluid is discharged to the other side, It is preferable that a suction valve disposed at the suction port and a discharge valve disposed at the discharge port are provided.
According to such a configuration, cut with applied to the check valve using the fluid coupling to the piston pump cylinder.

Further, the main body includes a valve seat of said inlet valve on the other hand are formed on the side of the body, is preferably provided with a valve seat of the discharge valve formed in said other side of said body.
According to such a configuration, since the main body includes the valve seat, a fluid coupling that is a simple structure and a highly durable check valve can be formed.

Preferably, the valve seat of the suction valve and the valve seat of the discharge valve are continuously formed integrally with the main body.

  The discharge valve includes a discharge valve body having a flat valve portion, and a discharge valve body guide portion that slidably supports the discharge valve body, and the suction valve has a flat valve portion. And a suction valve body guide portion that slidably supports the suction valve body, and the valve seat surface of the discharge valve and the valve seat surface of the suction valve are preferably flat.

  According to this configuration, the discharge valve body and the suction valve body are supported by the discharge valve body guide portion and the suction valve body by the suction valve body guide portion, so that the discharge valve body and the suction valve body slide stably. Open and close. In addition, the valve body can be improved in adhesion with a flat valve seat surface by forming the flat valve portion thin to facilitate bending.

  Moreover, it is preferable that the thickness of the flat valve part of the suction valve body and the discharge valve body is 15% or more and 45% or less with respect to the outer diameter of the flat valve part.

  According to such a configuration, the flat valve portions of the suction valve and the discharge valve are formed of a thin flat plate having a thickness of 15 to 45% with respect to the outer diameter of the flat valve portion. Abuts against the valve seat surface. Since the flat valve portion is thinner than the conventional valve body, the valve body is easily deformed along the shape of the valve seat, and the adhesion of the valve body to the valve seat can be enhanced. As a result, the flat valve portion of the valve body is in close contact with the valve seat surface, so that even if the valve seat begins to wear, leakage from the valve body can be prevented and the valve seat surface is less likely to be damaged. Thus, the life of the main body can be extended.

  The fluid coupling of the present invention can improve durability. Therefore, this fluid coupling can be suitably used for a pressure vessel used particularly in a high pressure region (350 to 700 MPa).

It is a schematic sectional drawing which shows an example of the check valve which concerns on embodiment of this invention. It is a principal part expanded sectional view of the check valve shown in FIG. (A) is a principal part expanded sectional view which shows the state of the suction valve at the time of valve closing, (b) is a principal part expanded sectional view which shows the state of the suction valve at the time of valve opening. (A) is a principal part expanded sectional view which shows the state of the discharge valve at the time of valve closing, (b) is a principal part expanded sectional view which shows the state of the discharge valve at the time of valve opening. (A) is an expanded sectional view which shows a suction valve body, (b) is an expanded sectional view which shows a discharge valve body.

  Hereinafter, a check valve that is a fluid coupling according to an embodiment of the present invention will be described with reference to the accompanying drawings. For convenience of explanation, in the check valve 1, one side (suction side) on which the suction valve 3 is disposed is appropriately referred to as a rear side, and the side on which the other side (discharge side) discharge valve 4 is disposed is appropriately referred to as a front side. .

  A check valve 1 disposed in a cylinder 5 of a piston pump, which is a pressure vessel, includes a valve seat 2 that is a main body having a discharge passage 22 (through passage) that communicates with the cylinder 5 and through which a fluid flows, and a valve seat 2. And a flange member 6 that is a receiving member that is supported and disposed in the cylinder 5. The valve seat 2 includes an engagement portion 2o formed on the rear side of the discharge passage 22 that is a through passage and engaged with the cylinder 5, and a tapered portion 2j that is a conical surface formed on the front side. Have. The flange member 6 has a tapered surface 6c that is a receiving portion having an inclination that is the same groove angle as the tapered portion 2j, and a discharge valve installation portion 6d (accommodating portion) that is a flow passage communicating with the front side of the discharge passage 22. And a male screw portion 6e. The flange member 6 supports the valve seat 2 with the flange member 6 by bringing the tapered portion 2 j of the valve seat 2 into contact with the tapered surface 6 c of the flange member 6.

The valve seat 2 includes a large-diameter portion 2a that is a diameter-expanded portion that is larger in diameter than the engaging portion 2o between the engaging portion 2o and the tapered portion 2j (conical surface).
The engaging portion 2o includes a suction side medium diameter portion 2b (first cylindrical portion) fitted inside the inner surface of the cylinder 5, a packing installation portion 2g having a smaller diameter than the first cylindrical portion, and this packing installation portion 2g. And a packing P disposed on the surface.
The valve seat 2 has a discharge-side medium diameter portion 2d which is a second cylindrical portion at the front end portion on the front side. The flange member 6 has a discharge valve installation part 6d into which the discharge-side medium diameter part 2d is fitted, and supports the valve seat 2 by regulating the discharge-side medium diameter part 2d by the discharge valve installation part 6d.
The valve seat 2 has a supply port 21 a through which fluid is supplied and a suction port 21 b through which the fluid supplied from the supply port 21 a is discharged to the inside of the cylinder 5.

The discharge flow path 22 (through path) includes an inflow port 22a into which the fluid pressurized in the cylinder 5 flows into the rear side (one side), and a discharge port 22b through which the fluid is discharged to the front side (the other side). ,have. The suction valve 3 is disposed in the suction port 21b. The discharge valve 4 is disposed at the discharge port 22b.
The valve seat 2 includes a suction valve seat 2h formed on the rear side and a discharge valve seat 2n formed on the front side thereof.

The discharge valve 4 includes a discharge valve body 41 having a flat valve portion 41a, and a discharge valve body guide portion 43a that slidably supports the discharge valve body 41. The suction valve 3 includes a suction valve body 31 having a flat valve portion 31a, and a suction side small diameter portion 2c that is a suction valve body guide portion that slidably supports the suction valve body 31. The seating surface of the discharge valve seat 2n and the seating surface of the suction valve seat 2h are flat.
The thickness t of the flat valve portions of the suction valve body 31 and the discharge valve body 41 is formed to be 15% or more and 45% or less with respect to the outer diameter of the flat valve portions 31a and 41a.

The inlet 1a is provided on the outer peripheral side of the flange member 6, and is connected via a pipe to a fluid supply unit that supplies fluid to the check valve 1 via a control valve (not shown).
The outlet 1b communicates with a supply destination to which high pressure fluid is supplied.

<Main body (valve seat)>
As shown in FIG. 2, the valve seat 2 includes a supply passage 21 through which fluid flows from an outer peripheral portion toward a suction port 21b formed on one side (suction side), and the other side (discharge side) from the inflow port 22a. And a discharge passage 22 (through-passage) through which a fluid flows toward the discharge port 22b. In the valve seat 2, a suction valve 3 for opening and closing the suction port 21b is disposed on the rear side, and a discharge valve 4 for opening and closing the discharge port 22b is disposed on the front side.

The valve seat 2 includes a large-diameter portion 2a (expanded diameter portion) formed on the center outer peripheral portion, a cross-sectional enlarged portion 2f formed on the rear side of the large-diameter portion 2a, an engaging portion 2o, and a suction-side small-diameter portion 2c. And a tapered portion 2j formed on the front side of the large-diameter portion 2a, a discharge-side medium-diameter portion 2d (second cylindrical portion), and a discharge-side small-diameter portion 2e. Is formed.
On the suction side of the valve seat 2, a cross-sectional enlarged portion 2f formed between the large diameter portion 2a and the cross-sectional enlarged portion 2f, an engagement portion 2o continuously formed on the rear side of the cross-sectional enlarged portion 2f, A suction valve seat 2h formed continuously on the rear side of the joint portion 2o and a spring receiving portion 2i formed on the rear end portion of the suction side small diameter portion 2c are formed.
On the discharge side of the valve seat 2, a tapered portion 2j formed between the large diameter portion 2a and the discharge side intermediate diameter portion 2d, a step surface 2k continuously formed on the front side of the discharge side intermediate diameter portion 2d, A reduced diameter portion 2m formed at the base end on the axial center side of the step surface 2k and a discharge valve seat 2n formed at the front end surface of the discharge side small diameter portion 2e are formed.
The valve seat 2 has a suction side medium diameter part 2b (first cylindrical part) fitted inside the inner wall of the cylinder chamber 5a, and a discharge side large diameter part 2a, a taper part 2j, and a discharge side medium diameter part. It is interposed between the cylinder 5 (pressure vessel) and the flange member 6 with 2d fitted in the through hole 6a.

  The supply channel 21 is a channel for sending the fluid supplied to the inlet 1a of the check valve 1 through the valve seat 2 to the suction port 21b. The supply channel 21 extends in an axial direction from a supply port 21 a formed on the outer peripheral surface of the large-diameter portion 2 a of the valve seat 2, and then has an L shape in front of the vicinity of the discharge channel 22. It is bent and formed along the discharge passage 22 toward the suction port 21b of the suction valve seat 2h.

  The supply port 21a is disposed so as to communicate with the inlet 1a of the flange member 6, and is connected to a fluid supply source (not shown) via a tube or the like via the flange member 6 and the inlet 1a.

  As shown in FIGS. 3 (a) and 3 (b), the suction port 21b is arranged in a state opened to the cylinder chamber 5a in the cylinder 5, and the front and rear direction (arrows i, j) of the plunger 7 (see FIG. 1). (Direction), the intake valve body 31 moves backward and forward (in the directions of arrows h and g) against the spring force of the valve spring 32, thereby opening and closing the valve.

  As shown in FIG. 2, the discharge channel 22 (through channel) is a channel for sending the fluid in the cylinder chamber 5a to the discharge port 22b. The discharge passage 22 is formed in a straight line from the inlet 22a at the center of the rear end of the valve seat 2 toward the discharge port 22b at the center of the front end of the valve seat 2 along the axial center line.

  The inflow port 22a is an opening into which the fluid in the cylinder chamber 5a pushed by the plunger 7 (see FIG. 1) is fed, and is formed at the rear end of the cylindrical suction side small diameter portion 2c. It opens to the cylinder chamber 5a.

  The discharge port 22b is an opening through which the fluid sent from the inflow port 22a into the discharge channel 22 by the plunger 7 (see FIG. 1) is discharged, and is a space in the valve body housing portion 44a of the valve body housing member 44. The discharge valve body 41 opens and closes the valve. A discharge valve seat 2n of the discharge valve 4 is formed at the peripheral edge of the discharge port 22b.

The large diameter portion 2 a (expanded diameter portion) is a cylindrical portion having the largest outer diameter in the valve seat 2, and is formed in the central portion of the valve seat 2 in the axial direction. The large-diameter portion 2a is formed to have a larger diameter than the engaging portion 2o between the engaging portion 2o (thin diameter portion) and the tapered portion 2j (conical surface). The seal member O provided in the flange member 6 is installed in a state in which the supply port 21a is formed in the large diameter portion 2a in the front-rear direction.
The large diameter portion 2 a (expanded diameter portion) is a cylindrical portion having the largest outer diameter in the valve seat 2, and is formed in the central portion of the valve seat 2 in the axial direction. The large-diameter portion 2a is formed with a larger diameter than the engaging portion 2o between the engaging portion 2o and the tapered portion 2j (conical surface). The seal member O provided in the flange member 6 is installed in a state in which the supply port 21a is formed in the large diameter portion 2a in the front-rear direction.

  The cross-sectional enlarged portion 2f is a portion formed in a tapered shape in which the cross-section gradually increases in diameter from the front end of the suction side medium diameter portion 2b to the rear end of the large diameter portion 2a in the discharge port side direction. It is formed on the rear side. The cross-sectional enlarged portion 2f is formed so that the outer diameter does not rapidly increase or decrease when viewed in cross section, and suppresses stress concentration. A gap S is formed between the cross-sectional enlarged portion 2f and the end face of the cylinder 5 adjacent to the rear side of the cross-sectional enlarged portion 2f, by arranging the notch portion 5c of the cylinder 5.

  Because of the clearance S, the cross-sectional enlarged portion 2f allows the fastening bolt B to tighten when the flange member 6 is fastened to the housing (not shown) with the valve seat 2 and the cylinder 5 interposed therebetween. However, it does not cover the valve seat 2 from the front end surface 5 b of the cylinder 5.

The engaging portion 2o is a portion where a part of the suction side of the valve seat 2 is inserted into the cylinder 5, and includes a suction side medium diameter portion 2b (first cylindrical portion), a packing installation portion 2g, and a packing P. And is configured. The length of the engaging portion 2 o is formed longer than the depth at which the engaging portion 2 o is inserted into the cylinder 5.
The suction-side medium diameter portion 2b is a cylindrical portion that is fitted into the inner surface of the cylinder chamber 5a, and is continuously formed on the rear side of the cross-sectional enlarged portion 2f.
The packing installation part 2g is a part to which the packing P fitted to the valve seat 2 is attached, and is continuously formed in a stepped shape slightly smaller than the thickness of the packing P on the rear side of the suction side medium diameter part 2b. . In other words, the packing installation portion 2g is formed on the front side (suction port side) of the cylinder 5.

  In the valve seat 2 (main body), the suction side medium diameter portion 2b formed on the suction port side is fitted into the inner surface of the cylinder 5, so that the valve seat 2 and the inner surface of the cylinder 5 (pressure vessel) are coaxial. Can be assembled in the state of being placed in The valve seat 2 has a packing installation portion 2g that is smaller in diameter than the suction-side medium-diameter portion 2b and is inserted into the inner surface of the cylinder 5 on the suction port side. Can be arranged. For this reason, the pressure due to the ultrahigh pressure fluid stored in the cylinder 5 is blocked by the packing P in the central portion of the valve seat 2 on the discharge side from the portion where the packing installation portion 2g of the valve seat 2 is formed. To prevent it from acting.

The discharge-side intermediate diameter portion 2d (second cylindrical portion) is a cylindrical portion formed toward the front side with the discharge valve 4 disposed from the proximal end portion on the reduced diameter side of the taper portion 2j. The discharge-side medium diameter portion 2d is fitted in a discharge valve installation portion 6d formed in the through hole 6a of the flange member 6.
The check valve 1 has a valve seat 2 (main body) having a discharge side medium diameter portion 2d (cylindrical portion) fitted into a discharge valve installation portion 6d (accommodating portion) of a flange member 6 (receiving member). The seat 2 and the flange member 6 can be arranged at accurate positions. The valve seat 2 and the flange member 6 are arranged accurately so that the resultant force of the force that the valve seat 2 receives from the flange member 6 and the point of action of the force that the valve seat 2 receives from the pressurized fluid are matched. become. In the check valve 1, when the operating points are precisely matched, the compressive stress acting inside the valve seat 2 is more uniformly distributed, and the durability of the valve seat 2 is improved.

The step surface 2k is a portion formed flat from the front end of the discharge-side intermediate diameter portion 2d in the axial direction, and the rear end surface of the cylindrical valve body housing member 44 is disposed opposite to the step surface 2k. Has been.
The reduced diameter portion 2m is a portion formed in a taper shape from the axial center side base end portion of the stepped surface 2k to the rear end of the discharge side small diameter portion 2e. The reduced diameter portion 2m is installed in a state in which the rear end of the valve body housing member 44 is in contact.

  The discharge side small-diameter portion 2e is a cylindrical portion to which the rear end portion of the valve body housing member 44 is fitted, and is formed from the front end of the reduced diameter portion 2m to the periphery of the discharge valve seat 2n.

<Flange member>
As shown in FIG. 1, the flange member 6 (valve seat receiving member, receiving member) holds the valve seat 2 in which the suction-side intermediate diameter portion 2b is fitted in the front end portion of the cylinder chamber 5a from the front inner surface side. It is a holding member to do. The flange member 6 is formed with a through hole 6a including a receiving portion for accommodating the large-diameter portion 2a and the tapered portion 2j of the valve seat 2 and a flow passage on the axial center line. Further, a bolt insertion hole 6g into which a fastening bolt B for fastening the flange member 6 to a housing (not shown) is inserted is formed. Here, the “flow passage” in the claims refers to a flow passage communicating with the front side of the discharge flow passage 22 (through passage).

As shown in FIG. 2, the valve seat 2, the valve body housing member 44, and the connection member 8 are coaxially inserted in the flow passage. In the through hole 6a, a step surface 6f disposed in a state where the front end surface 5b of the inserted cylinder 5 abuts, and a valve seat internal portion 6b (receiving) in which the large diameter portion 2a of the valve seat 2 is fitted. Part), a tapered surface 6c (receiving part) opposed to each other so that the tapered part 2j matches, and a discharge valve installation part 6d into which the valve body housing member 44 forming the outer peripheral part of the discharge valve 4 is inserted, An internal thread portion 6e to which the connecting member 8 is fixed is formed.
The “accepting portion” described in the claims includes the valve seat inner portion 6b and the tapered surface 6c.

  The connection member 8 is a holding member having a male screw portion 8a that is screwed into the female screw portion 6e so as to close the front end portion side of the valve body housing member 44. The connection member 8 includes a male screw portion 8a formed on the outer peripheral portion, a connection hole 8b forming an outlet 1b of a flow path formed on the axis, and a female screw portion formed on the opening end side in the connection hole 8b. 8c is formed. A connecting tool is screwed to the female screw portion 8c.

<Housing>
A housing (not shown) is a member that accommodates the cylinder 5 and to which the flange member 6 is fastened, and includes a pump housing such as a high-pressure pump.

<Cylinder>
As shown in FIG. 1, the cylinder 5 (pressure vessel) is a cylindrical member that forms a cylinder chamber 5a into which the plunger 7 is inserted so as to be able to advance and retract, and is provided in a housing (not shown). The cylinder 5 has the cylinder chamber 5a on the axial center side, and has a notch 5c on the axial center side of the front end surface 5b. In the front end portion of the cylinder 5, the front end surface 5 b is in contact with the step surface 6 f of the flange member 6.

<Plunger>
As shown in FIG. 1, the plunger 7 is a member that reciprocates by hydraulic pressure or the like. The plunger 7 moves backward to suck the suction valve body 31 against the valve spring 32, and sucks the fluid in the supply flow path 21 into the cylinder chamber 5a and moves forward to move into the cylinder chamber 5a. It functions as a plunger pump that presses the fluid and feeds the fluid from the inlet 22a into the discharge channel 22.

<Suction valve>
As shown in FIGS. 3A and 3B, the suction valve 3 is a valve that opens and closes the suction port 21b. The suction valve 3 includes a suction port 21b, a suction valve seat 2h formed at the periphery of the suction port 21b, a suction valve body 31 that closes the suction port 21b, and a valve that biases the suction valve body 31 toward the valve closing side. It consists of a normally closed valve comprising a spring 32, a suction valve body 31 and a suction side small diameter portion 2c (valve body guide portion) that supports the valve spring 32, and a spring receiving portion 2i of the valve spring 32.

The suction valve body 31 is composed of an annular flat plate member that is urged by the valve spring 32 to close the suction port 21b, and closes and opens the suction port 21b. The suction valve 3 is opened when the fluid supplied to the supply passage 21 presses the suction valve body 31 in the rearward direction with a force greater than the spring force of the valve spring 32, and is supplied to the supply passage 21. When the fluid is less than the spring force of the valve spring 32, the suction valve body 31 is pressed forward to close the valve. The suction valve body 31 has a flat valve portion 31a that contacts the valve seat surface, and is slidably disposed along the suction side small diameter portion 2c (valve body guide portion) that supports the suction valve body 31. . As shown in FIGS. 5A and 5B, the suction valve body 31 and the discharge valve body 41 to be described later have the flat valve portions 31a and 41a having a thickness t that is equal to the outer diameter of the flat valve portions 31a and 41a. On the other hand, it is formed of 15% or more and 45% or less, and is made of, for example, stainless steel formed thinner than a conventional valve body.
As shown in FIG. 3A, the valve spring 32 is a spring member that constantly presses the suction valve body 31 in the valve closing direction (arrow g direction) with a preset spring force, and includes a compression coil spring.

  The suction valve seat 2h is a portion where a suction seat 21b and a valve seat in which a suction valve body 31 for opening and closing the suction port 21b is arranged are formed. The suction valve seat 2h is formed by a flat surface formed radially from the front end side proximal end portion of the suction side small diameter portion 2c toward the outer periphery with the suction side small diameter portion 2c as the center.

  The suction side small-diameter portion 2c (suction valve body guide portion) is a portion that supports and guides the valve spring 32 of the suction valve 3 so as to be extendable and contractible, and the outer diameter of the suction-side middle diameter portion 2b and the inner diameter of the valve spring 32. Smaller diameter. The suction side small-diameter portion 2c is formed of a cylindrical projection protruding from the suction valve seat 2h toward the rear side, the discharge passage 22 is formed inside, and the spring receiving portion 2i is formed at the outer rear end portion. ing.

  The spring receiving portion 2i is a portion that receives the rear end of the valve spring 32 formed of a compression coil spring, and is formed in, for example, an annular shape (a bowl shape) integrally formed with the rear end portion of the suction side small diameter portion 2c. . The spring receiving portion 2i only needs to have a function of receiving the valve spring 32, and may be a member that can be attached to the suction side small diameter portion 2c such as a retaining ring separate from the valve seat 2. Good.

<Discharge valve>
As shown in FIG. 2, the discharge valve 4 is a valve that opens and closes the discharge port 22 b of the valve seat 2. The discharge valve 4 includes a discharge valve seat 2n formed at the peripheral edge of the discharge port 22b, a discharge valve body 41 that opens and closes the discharge port 22b, and a discharge valve body 41 that is in contact with the discharge valve seat 2n. A valve spring 42 that closes the valve, a valve body support member 43 that supports the discharge valve body 41, and a valve body housing member 44 that houses the discharge valve body 41, the valve spring 42, and the valve body support member 43. Yes.

As shown in FIGS. 4A and 4B, the discharge valve body 41 is provided with a rod having a flat disk-like flat valve portion 41a and a rod-like portion 41b protruding from the flat valve portion 41a. It consists of a flat valve and is formed of, for example, stainless steel.
The flat valve portion 41a is formed in a circular flat plate shape with a small plate thickness, and is a portion that contacts the valve seat surface and closes the discharge port 22b. The discharge valve seat 2n is a flat surface formed on the front end surface of the valve seat 2.
The rod-like portion 41 b is slidably inserted into a valve body support member 43 having a discharge valve body guide portion 43 a formed in a cylindrical shape that supports the discharge valve body 41.

  The valve spring 42 is a spring member for pressing the flat valve portion 41a against the discharge valve seat 2n, and includes a compression coil spring. The valve spring 42 is loosely fitted in the discharge valve body guide portion 43a so as to be extendable and retractable, the rear end is supported by the discharge valve body 41, and the front end is a spring receiver formed on the discharge side (front side) of the discharge valve body guide portion 43a. It is supported by the portion 43b.

The valve body support member 43 is a member that performs a function of supporting the discharge valve body 41, a function of supporting the valve spring 42, and a function of a flow path for discharging the fluid in the valve body housing portion 44a from the outlet 1b. is there. The valve body support member 43 includes a discharge valve body guide portion 43a, a spring receiving portion 43b, an axial hole 43c formed so as to penetrate in the axial direction, and a lateral passage penetrating perpendicularly to the axial hole 43c. A hole 43d is formed.
A valve spring 42 is fitted on the outside of the discharge valve body guide portion 43a, and a rod-like portion 41b of the discharge valve body 41 is inserted into the shaft center hole 43c so as to be housed in the valve body housing portion 44a of the valve body housing member 44. Has been.

  As shown in FIGS. 4A and 4B, the discharge valve body guide portion 43a is a cylindrical portion that extends from the center of the rear end portion of the spring receiving portion 43b toward the rear side. The discharge valve body guide portion 43a supports the rod-like portion 41b so as to be able to advance and retreat inside the discharge valve body guide portion 43a (axial center hole 43c), and the valve spring 42 in the front-rear direction outside the discharge valve body guide portion 43a. Supports to expand and contract.

The spring receiving portion 43b is a portion that is integrally formed on the front end side of the discharge valve body guide portion 43a with an outer diameter larger than the outer diameter of the discharge valve body guide portion 43a and supports the valve spring 42. An axial hole 43c and a lateral hole 43d forming a path are formed. The spring receiving portion 43 b is arranged in a state where it is urged by the valve spring 42 and pressed against the rear end surface of the accommodating member flow passage portion 44 b of the valve body accommodating member 44.
In addition, the spring receiving part 43b can also be formed in the rear-end surface of the accommodating member flow-path part 44b.

The shaft hole 43 c is formed along the shaft center from the rear end surface to the front end surface of the valve body support member 43. The axial hole 43c forms a support portion where the rear side is inserted into the rod-like portion 41b, and the front side forms a flow path for flowing the fluid in the horizontal hole 43d to the accommodating member flow path portion 44b.
The horizontal hole 43d is a flow passage formed from the outer peripheral part on one side of the spring receiving part 43b to the outer peripheral part on the other side through the axial center hole 43c, and the fluid in the valve body housing part 44a is passed through the axial center hole. It is formed for feeding to 43c.

As shown in FIG. 2, the valve body housing member 44 includes a valve body housing portion 44a in which a space for housing the discharge valve 4 is formed, and a housing member flow channel portion 44b in which a flow path is formed. It is a cylindrical member. The valve body housing member 44 may be formed as a single member in which the valve body housing portion 44a and the housing member flow channel portion 44b are integrated, but the valve body housing portion 44a and the housing member flow channel portion 44b are separate members. It is preferable to form with.
The valve body accommodating member 44 is provided in the discharge valve installation portion 6d (accommodating portion) of the flange member 6, and the outer end of the discharge valve seat 2n is placed in the rear end with the rear end in contact with the reduced diameter portion 2m. The discharge side small diameter portion 2e is fitted inside, and the connection member 8 is provided in contact with the front side.

  The accommodating member channel portion 44b has a cylindrical shape in which a channel 44e through which the fluid in the valve element accommodating portion 44a passes toward the outlet 1b is formed. The flow path inlet 44c communicates with the axial hole 43c. The channel outlet 44d may be formed in a tapered shape that expands to the front side. The front end face of the housing member flow path portion 44 b is in contact with the rear end face of the connection member 8.

<Action>
Next, the operation of the check valve according to the embodiment of the present invention will be described with reference to the accompanying drawings.

  When the reciprocating plunger 7 moves in the rearward direction (in the direction of arrow i in FIG. 1), the plunger 7 opens the intake valve body 31 of the intake valve 3 as shown in FIG. The fluid in the flow path 21 is sucked to the cylinder chamber 5a side. At this time, the pressure of the fluid in the supply flow path 21, the cylinder chamber 5a, and the discharge flow path 22 is, for example, 0.4 MPa.

  The fluid in the supply channel 21 flows in the direction of the cylinder chamber 5a (in the direction of the arrow b) by being sucked by the plunger 7, and resists the valve spring 32 against the suction valve body 31 that has closed the suction port 21b. Then, the suction valve body 31 is opened by pressing backward (arrow h direction). Since the annular suction valve body 31 is guided by being freely fitted to the suction side small diameter portion 2c (valve body guide portion) together with the valve spring 32, it slides in a stable state along the suction side small diameter portion 2c. Open and close. That is, the movement of the flat valve portion 31a is also stabilized.

  In addition, the rigidity of the suction valve body 31 is reduced by reducing the thickness of the flat valve portion 31a. On the other hand, the flat valve portion 31a is bent due to the pressure difference, so that the suction valve body 2h is flat. Increased adhesion. The suction valve seat 2h gradually wears due to the opening and closing of the suction valve body 31, but despite the wear of the suction valve seat 2h, the flat valve portion 31a has high adhesion to the suction valve seat 2h. Can prevent leakage.

  When the plunger 7 (see FIG. 1) is moved to the rear side, the discharge valve 4 has a flat valve portion 41a of the discharge valve body 41 by the spring force of the valve spring 42, as shown in FIG. The valve is pressed against the discharge valve seat 2n to be closed. The pressure of the fluid in the discharge flow path 22 at this time is 0.4 MPa, for example. Moreover, the pressure of the fluid in the valve body accommodating part 44a is 500 MPa, for example.

  When the plunger 7 moves in the front direction (arrow j direction in FIG. 1), the plunger 7 presses the fluid in the cylinder chamber 5a in the front direction to close the suction port 21b, and in FIG. As shown, the fluid in the cylinder chamber 5a is caused to flow in the direction in the discharge flow path 22 (the direction of the arrow c). The pressure of the fluid in the supply flow path 21 at this time is, for example, 0.4 MPa, and the pressure of the fluid in the discharge flow path 22 is, for example, 500 MPa.

  The fluid in the cylinder chamber 5a flows into the discharge flow path 22 through the inlet 22a, and as shown in FIG. 4B, moves the flat valve portion 41a of the discharge valve body 41 forward (in the direction of the arrow m). The valve body 42 is pressed against the valve spring 42 to open the discharge valve body 41 and flows into the valve body housing portion 44a. Thereafter, the fluid exits from the inside of the valve body accommodating portion 44a through the horizontal hole 43d of the valve body support member 43, the axial hole 43c, the flow path 45a of the connection member 45, and the connection hole 8b of the connection member 8 shown in FIG. Go out from 1b.

  As shown in FIG. 4B, when the discharge valve 4 is opened, the discharge valve body 41 having the rod-like portion 41b inserted into the discharge valve body guide portion 43a of the valve body support member 43 slides. The valve spring 42 is also compressed while being supported by the discharge valve body guide portion 43a. At this time, the pressure of the fluid in the discharge flow path 22 and the valve body accommodating portion 44a is, for example, 500 MPa.

The discharge valve body 41 slides in a stable state along the discharge valve body guide portion 43a to open and close the valve.
Further, the discharge valve body 41 is reduced in rigidity by reducing the thickness of the flat valve portion 41a. On the other hand, the flat valve portion 41a is bent due to a pressure difference, so that a flat discharge valve seat 2n is formed. Increased adhesion. The discharge valve seat 2n gradually wears due to the opening and closing of the discharge valve body 41. However, despite the wear of the discharge valve seat 2n, the flat valve portion 41a has high adhesion to the discharge valve seat 2n. Can prevent leakage.

The intake valve body 31 and the discharge valve body 41 of the check valve 1 according to the present embodiment have been tested by reducing the thickness of the flat valve portions 31a and 41a. sealability becomes unavailable eliminated in .5 × 10 ⁵ times, Tairaben portion 31a, 41a according to the present invention was able to extend the sealing properties until the repeat count 1 × 10 ⁶ times.

As shown in FIG. 4B, when the plunger 7 moves in the front direction (the direction of arrow j in FIG. 1), the pressure in the cylinder chamber 5a of the cylinder 5 (pressure vessel) is applied to the valve seat 2 (main body). Works. Since the taper portion 2j (conical surface) of the valve seat 2 and the taper surface 6c of the receiving portion of the flange member 6 have the same groove angle, the entire taper surface 6c of the flange member 6 has the inside of the cylinder chamber 5a. Receives force F1 due to pressure. As a result of the reaction, the flange member 6 gives the valve seat 2 a force F2 perpendicular to the taper portion 2j of the valve seat 2 and directed from the periphery to the center portion.
On the other hand, the same pressure as that of the cylinder chamber 5a acts on the discharge passage 22. The pressure applied to the discharge channel 22 tends to push the valve seat 2 from the center toward the radially outer periphery. Due to the force acting from the outer periphery and the force acting from the inside, a substantially uniform compressive stress acts on the entire valve seat 2.

The valve seat 2 has a reduced diameter portion 2m inclined between the step surface 2k and the discharge-side intermediate diameter portion 2d (second cylindrical portion), so that the cross section of the valve seat 2 is rapidly expanded. Since there is no location, stress concentration is difficult to occur and cracks and cracks can be prevented from occurring.
Since the valve seat 2 eliminates the occurrence of tensile stress at the root of the flange-shaped portion, the life of the valve seat 2 can be extended.

  Further, the check valve 1 is formed so that the thickness t of the flat valve portions 31a and 41a of the intake valve body 31 and the discharge valve body 41 is 15% or more and 45% or less with respect to the outer diameter of the flat valve portions 31a and 41a. Thus, while maintaining the strength, it is thinned to an extent that allows deformation and lowered in rigidity, so that it comes into contact with the suction valve seat 2h and the discharge valve seat 2n while being bent. Can be provided.

[First Modification]
The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea. The present invention extends to these modifications and changes. Of course.

The check valve 1 described in the above embodiment is an optimal valve for an ultra-high pressure generator such as a high-pressure pump. However, the check valve 1 is particularly installed as long as the intake valve 3 and the discharge valve 4 can be installed. The location is not limited.
In the above embodiment, the fluid coupling which is the check valve 1 has been described. However, a self-contained valve seat 2 having a drain passage 22 (through passage) and a flange-shaped flange member 6 (receiving member) are provided. It can be used universally for the fluid coupling of the pressure vessel provided.
For example, the suction valve 3 or the discharge valve 4 may be removed using a pressure vessel instead of the cylinder 5. When the discharge valve 4 is removed, the valve body housing member 44 and the housing member flow path portion 44b may also be removed. When the suction valve 3 is removed, the supply flow path 21 is also removed. The discharge flow path 22 in the above-described embodiment is used as a fluid passage between the pressure vessel and the outside.
Such a fluid coupling is particularly suitable for pressure vessels that contain very high pressure fluid or pressure vessels with high pressure amplitude and frequency.

1 Fluid coupling (check valve)
2 Body (valve seat)
2a Large diameter part (expanded part)
2b Suction side medium diameter part (first cylindrical part)
2c Suction side small diameter part (suction side small diameter cylindrical part, suction valve body guide part)
2d Discharge side medium diameter part (second cylindrical part)
2f Cross-sectional enlarged part 2g Packing installation part (engagement part)
2j Conical surface (tapered part)
2n Discharge valve seat 2o Engagement part 3 Suction valve 4 Discharge valve 5 Pressure vessel (cylinder)
5a Cylinder chamber 6 Receiving member (flange member, valve seat receiving member)
6a Through hole 6b Valve seat internal portion 6b (receiving portion)
6c Tapered surface (receiving part)
6d storage part (flow passage, discharge valve installation part)
6e Female thread (flow passage)
21 Supply channel 21b Suction port 22 Drain channel (through channel)
22a Inflow port 22b Discharge port 31 Suction valve body 31a, 41a Flat valve part 41 Discharge valve body 41b Rod-like part 42 Valve spring 43 Valve body support member 43a Discharge valve body guide part 43b Spring receiving part 44 Valve body housing member 44a Valve body housing Part 44b Housing member flow path part D Outer diameter of flat valve part of suction valve and discharge valve P Packing (engagement part)
t Thickness of the flat valve section of the intake and discharge valves

Claims (9)

A fluid coupling disposed in the pressure vessel,
A body,
A through passage through which fluid flows and communicates with the pressure vessel ;
A first cylindrical portion formed on one side of the main body and disposed in engagement with the pressure vessel; and fitted into an inner surface of the pressure vessel; provided on the first cylindrical portion; A packing installation portion having a smaller diameter than the cylindrical portion, and an engagement portion having a packing disposed in the packing installation portion ;
A conical surface formed on the other side ;
A diameter-expanded portion that is larger in diameter than the engagement portion between the engagement portion and the conical surface;
A cross-sectional enlarged portion in which a cross-section is enlarged from the engagement portion toward the enlarged diameter portion;
A body having
A accepted member,
A receiving portion having a tapered surface of the same included angle and the previous SL conical surface,
Anda flow path communicating to the other side of said through-passage,
Wherein disposed in the pressure vessel and the conical surface of the body is brought into contact with the tapered surface of the receiving member, the receiving member supporting the main body,
With
The pressure vessel has a notch in a front end surface;
The pressure vessel and the main body are partitioned by the enlarged cross-sectional portion and the cutout portion, and are formed so that the pressure vessel and the main body do not directly or indirectly contact each other in the axial direction. Provided gaps,
Flow body joints. The main body has a second cylindrical portion at a front end portion on the other side,
The receiving member has a receiving portion to which the second cylindrical portion is fitted, to restrict the second cylindrical portion in the receiving portion that are supporting the body,
Fluid coupling according to 請 Motomeko 1. The body is
A stepped surface continuously formed on the front side of the second cylindrical portion;
A diameter-reduced portion formed at the base end on the axial center side of the stepped surface;
A discharge-side small-diameter portion continuously formed on the front side of the reduced-diameter portion,
The fluid coupling according to claim 2. Comprising a valve body housing member,
The valve body housing member is inserted into the housing portion, and is disposed at a position where an end of the valve body housing member abuts on the reduced diameter portion,
The fluid coupling according to claim 3. The pressure vessel is a cylinder of a piston pump,
The body includes a supply port to which the fluid is supplied;
Meanwhile a suction port for discharging the fluid supplied from the supply port on a side in the cylinder, has,
The through-passage has an inlet through which the fluid pressurized in the cylinder flows into the one side;
A discharge port for discharging the fluid on the other side;
A suction valve disposed in the suction port;
A discharge valve disposed in the discharge port, that features,
請 Motomeko 1 to the fluid coupling according to any one of claims 4. The body is
A valve seat of the intake valve formed on the one side of the main body ;
That features a valve seat of the discharge valve formed in said other side of said body,
Fluid coupling according to 請 Motomeko 5. The valve seat of the suction valve and the valve seat of the discharge valve are continuously formed integrally with the main body,
The fluid coupling according to claim 6. The discharge valve includes a discharge valve body having a flat valve portion;
A discharge valve body guide portion that slidably supports the discharge valve body, and
The suction valve includes a suction valve body having a flat valve portion;
A suction valve body guide portion that slidably supports the suction valve body,
A valve seat surface of the valve seat surface and the suction valve of the discharge valve, Ru plane der,
請 Motomeko 6 or fluid coupling according to claim 7. The thickness of the Tairaben portion of the suction valve body and the discharge valve body, that is formed of 45% or less than 15% with respect to the outer diameter of the Tairaben portion,
Fluid coupling according to 請 Motomeko 8.

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