JP2013096496A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembly and to effectively suppress vibration of a valve element while simplifying a structure, in a check valve including a valve housing in which a valve seat is provided while opening an inlet-side flow passage, the valve element which can be seated on the valve seat, and a coil spring for energizing the valve element to the side of seating on the valve seat.SOLUTION: A coil spring 28 is configured by winding a strip-like spring material 28a having a horizontal cross-sectional shape which is long in the operating direction of a valve element 27.

Description

  The present invention provides a valve housing in which a valve seat having an inlet-side flow path opened and a valve chamber facing the valve seat is formed inside, a valve body that can be seated on the valve seat, and the valve The present invention relates to a check valve including a coil spring accommodated in the valve chamber so as to urge a body to the side seated on the valve seat.

  In FIG. 8, a valve seat 62 that opens the inlet-side flow passage 61 in the center is provided in the valve housing 63, and a valve body 64 that can be seated on the valve seat 62 is attached to the valve seat 62 by a spring 65. In a check valve that is biased, the valve body 64 may be seated on the valve seat 62 with its axis inclined with respect to the axis of the inlet-side flow path 61. As a result of the non-uniform pressure distribution, as shown in FIG. ) And a longitudinal vibration that reciprocates along the axis of the inlet-side flow path 61 by a movement amount x, and the transverse vibration and the longitudinal vibration are coupled and are generated independently. It is difficult to do.

  In order to suppress such self-excited vibration, the one disclosed in Patent Document 1 relates to the guide member on the shaft portion provided integrally with the valve body so as to be guided by the guide member fixed to the valve housing. A flow resistance member located on the opposite side of the valve seat is attached so as to impart flow resistance from a fluid to the valve body.

JP-A-6-185645

  However, in the one disclosed in Patent Document 1, the flow resistance member, which is a member different from the valve body, is attached to the shaft portion of the valve body, which increases the number of parts and increases the size of the check valve. In addition, since it is necessary to attach the flow resistance member to the shaft portion after the shaft portion is fitted to the guide member, the assembly work becomes complicated and the structure may be complicated.

  The present invention has been made in view of such circumstances, and provides a check valve capable of effectively suppressing vibration of a valve body while facilitating assembly and simplifying the structure. Objective.

  In order to achieve the above-mentioned object, the present invention provides a valve housing in which a valve seat having an inlet-side flow path opened and a valve chamber facing the valve seat is formed, and seated on the valve seat A check valve comprising a possible valve body and a coil spring accommodated in the valve chamber so as to bias the valve body toward a side seated on the valve seat, wherein the coil spring includes the valve body The first feature is that the belt-shaped spring material having a long cross-sectional shape in the operation direction is wound.

  The present invention also provides a valve housing in which a valve seat having an inlet-side flow path opened is provided and a valve chamber facing the valve seat is formed therein, a valve body that can be seated on the valve seat, A check valve comprising a coil spring accommodated in the valve chamber so as to urge the valve body toward the side seated on the valve seat, wherein the coil spring is in a direction orthogonal to the operation direction of the valve body. A second feature is that a belt-shaped spring material having a long cross-sectional shape is wound.

  According to the present invention, in addition to the configuration of the first or second feature, the coil spring is tapered so as to have a smaller diameter toward the receiving surface formed on the valve body so as to receive the coil spring. The third feature is that it is formed in a shape.

  According to the present invention, in addition to any of the configurations of the first to third features, a guide member that forms the valve chamber is attached to the valve housing between the valve seat and the guide member. A cylindrical portion in which a shaft portion provided integrally with the valve body is coaxially surrounded and inserted into the valve housing and provided with communication holes communicating with an outlet-side flow path at a plurality of circumferential positions; and the shaft portion is slid A guide hole that is movably fitted is formed, and a support cylinder portion that is integrally and coaxially connected to an end portion of the cylindrical portion on the valve seat side, and an outer surface of the support cylinder portion faces the communication hole. A ring-shaped spring receiving portion that is formed in a tapered shape having a larger diameter as the end and receives one end of the coil spring provided between the guide member and the valve body is provided on the outer surface of the support cylinder portion. Features.

  Furthermore, in the present invention, in addition to the configuration of the first feature, the coil spring is formed so that a part of the spring material overlaps in a direction orthogonal to the operation direction of the valve body when the coil spring contracts. Is the fifth feature.

  According to the first feature of the present invention, the coil spring for urging the valve body toward the seat on the valve seat winds the strip-shaped spring material having a long cross-sectional shape in the operation direction of the valve body. Since it is configured, resistance to vibration in a direction perpendicular to the operation direction of the valve body is imparted from the spring material to the valve body, and vibration in a direction perpendicular to the operation direction of the valve body, that is, lateral vibration ( (Pendulum vibration) can be damped, and vibration generated in combination with this vibration, that is, longitudinal vibration can also be suppressed. Moreover, when the valve element is separated from the valve seat, the space between the spring materials is narrowed due to the contraction of the coil spring, so that the flow resistance by the coil spring can be efficiently applied to the valve element. Accordingly, the coil spring itself can function as a flow resistance member, and it is not necessary to separately provide a dedicated flow resistance member, and vibration of the valve body is effectively performed while facilitating assembly and simplifying the structure. Can be suppressed.

  Further, according to the second feature of the present invention, the coil spring for biasing the valve body toward the side seating on the valve seat has a strip-shaped spring having a long cross-sectional shape in a direction perpendicular to the operation direction of the valve body. Since the material is wound, resistance to vibration in the operating direction of the valve body is imparted from the spring material to the valve body, so that vibration in the operating direction of the valve body, that is, longitudinal vibration can be attenuated. It is also possible to suppress vibrations that are coupled to vibrations, that is, lateral vibrations (pendulum vibrations). In addition, when the valve body that vibrates is separated from the valve seat, the space between the spring materials is narrowed by the contraction of the coil spring, so that the flow resistance by the coil spring can be efficiently applied to the valve body. Accordingly, the coil spring itself can function as a flow resistance member, and it is not necessary to separately provide a dedicated flow resistance member, and vibration of the valve body is effectively performed while facilitating assembly and simplifying the structure. Can be suppressed.

  According to the third feature of the present invention, since the coil spring has a tapered shape with a smaller diameter toward the receiving surface side of the valve body, the centering effect of the valve body can be obtained and the vibration preventing effect can be obtained. The coil spring can be easily expanded and contracted even if the spring material is in the form of a strip.

  According to the fourth aspect of the present invention, the guide member attached to the valve housing has a cylindrical portion that is coaxially surrounded by the shaft portion of the valve body and is inserted into the valve housing and is provided with a plurality of communication holes. A guide hole for slidably fitting the shaft portion is formed, and a support cylinder portion that is integrally and coaxially connected to an end portion of the cylindrical portion on the valve seat side is provided, and an outer surface of the support cylinder portion is a communication hole. Since the annular spring receiving portion that receives one end of the coil spring is provided on the outer surface of the support cylinder portion, the fluid that has reached the vicinity of the guide member is formed on the outer surface of the support cylinder portion. Guided and circulated to the communication hole side, fluid can be smoothly circulated.

  Further, according to the fifth feature of the present invention, when the coil spring is contracted, a part of the spring material overlaps in a direction perpendicular to the operation direction of the valve body. The space between the spring materials is further reduced by the contraction of the spring, and the flow resistance by the coil spring can be more effectively applied to the valve body.

It is a partially cutaway side view of the fuel pump provided with the check valve of the first embodiment. It is an enlarged view in the valve closing state of the check valve of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a longitudinal cross-sectional view corresponding to FIG. 2 of the check valve in the valve open state. It is a graph which shows the comparison of the transverse vibration by the presence or absence of flow resistance. It is a graph which shows the comparison of the longitudinal vibration by the presence or absence of flow resistance. It is a longitudinal cross-sectional view corresponding to FIG. 2 of the check valve of the second embodiment. It is a longitudinal cross-sectional view of the conventional check valve for demonstrating the state which self-excited vibration produces. It is a graph which shows the transverse vibration and longitudinal vibration which arise with the conventional check valve.

  Embodiments of the present invention will be described with reference to the accompanying drawings.

  The first embodiment of the present invention will be described with reference to FIGS. 1 to 6. First, in FIG. 1, the fuel pump P is accommodated in a fuel tank mounted on a vehicle, for example. The housing 11 of the fuel pump P is held in cooperation by a bottomed cylindrical pump holder 12 in which the lower portion of the housing 11 is fitted and a mounting base member 13 attached to the ceiling wall of the fuel tank. A filter 14 for filtering fuel in the fuel tank is connected to the lower portion of the fuel pump P.

  The housing 11 includes a cylindrical housing main body 15, a lower bracket (not shown) fixed to the lower portion of the housing main body 15, and an upper bracket 17 that is caulked and coupled to the upper portion of the housing main body 15. The The mounting base member 13 is integrally provided with a connecting cylinder 18 in which a part of the upper bracket 17 is liquid-tightly fitted and a fuel discharge pipe 19 projecting outward. An outlet-side flow path 20 is formed in the discharge pipe 19. The mounting base member 13 is formed with a pressure adjusting passage 21 branched from the outlet side flow path 20, and the pressure adjusting path 21 pressurizes fuel as a fluid flowing through the outlet side flow path 20. Is connected to a regulator valve 22 held by the mounting base member 13 so as to adjust the pressure to a predetermined pressure.

  The upper bracket 17 is provided with a check valve 24A for preventing the fuel discharged from the fuel pump P from flowing back to the fuel pump P, and the valve housing 25 of the check valve 24A includes the check valve 24A. A part of the upper bracket 17 is formed and is fitted in the connecting cylinder 18 of the mounting base member 13 in a liquid-tight manner.

  In FIG. 2, the check valve 24 </ b> A is provided with an inlet side flow passage 29 that guides fuel discharged from the fuel pump P, and a valve seat 30 having the inlet side flow passage 29 opened at the center. 25, a valve chamber 31 that always communicates with the outlet-side flow path 20 is formed between the valve seat 30 and a guide member 26 fixed to the valve housing 25, and can be seated on the valve seat 30. In addition, a valve body 27 guided by the guide member 26 and a coil spring 28 that urges the valve body 27 toward the seating side of the valve seat 30 are provided.

  The valve housing 25 includes an inlet-side flow passage 29 having one end communicating with the housing 11 of the fuel pump P, and the valve seat formed in an annular shape surrounding the other end opening of the inlet-side flow passage 29. 30, a tapered hole 32 having a small diameter end on the valve seat 30 side, an insertion hole 33 coaxially connected to the large diameter end of the tapered hole 32, and an insertion hole 33 coaxially connected to the other end of the insertion hole 33 A fitting hole 34 having a larger diameter than 33 is provided, and an annular step 35 is formed between the insertion hole 33 and the fitting hole 34. In addition, the protruding end of the valve housing 25 is integrally provided with a thin cylindrical portion 25 a that forms a part of the fitting hole 34.

  The guide member 26 includes a ring plate portion 26a fitted in the fitting hole 34, a cylindrical portion 26b connected to the inner peripheral portion of the ring plate portion 26a so as to be inserted into the insertion hole 33, The cylindrical portion 26b has a coaxial guide hole 36 and has a support cylinder portion 26c that is coaxially connected to the end of the cylindrical portion 26b on the valve seat 30 side, and is fitted in the fitting hole 34. Further, the thin cylindrical portion that is caulked so that the ring plate portion 26a is engaged with the step portion 35 between the insertion hole 33 and the fitting hole 34 in the valve housing 25 and the outer peripheral portion of the ring plate portion 26a. The guide member 26 is attached to the valve housing 25 by being sandwiched between the valve housing 25 and the valve housing 25.

  Communication holes 37, 37... For communicating the valve chamber 31 with the outlet-side flow path 20 are provided at a plurality of locations in the circumferential direction of the cylindrical portion 26b, and close to the cylindrical portion 26b of the outer surface of the support cylinder portion 26c. This portion is formed as a tapered surface 38 that increases in diameter toward the communication holes 37, 37... In order to smoothly guide the fuel to the communication holes 37, 37.

  The valve body 27 is slidably fitted to the valve member 40 that can be seated on the valve seat 30 and the guide hole 36 of the support cylinder portion 26c of the guide member 26 so as to be slidable by the guide member 26. A shaft portion 41 that is coaxially connected to the valve portion 40 so as to be supported by the valve portion 40 is integrally formed of rubber.

  The coil spring 28 is provided between the valve portion 40 and the guide member 26, and an annular spring receiving portion 42 that receives one end of the coil spring 28 is provided on the outer periphery of the support cylinder portion 26 c of the guide member 26. An annular receiving surface 43 for receiving the other end of the coil spring 28 is formed on the outer peripheral portion of the end of the valve portion 40 opposite to the valve seat 30.

  The coil spring 28 is configured by winding a strip-shaped spring material 28a having a long cross-sectional shape in the operation direction of the valve body 27, and in this embodiment, the operation direction of the valve body 27 The coil spring 28 is formed by winding a strip-shaped spring material 28a having a long rectangular cross-sectional shape, and is formed in a tapered shape so that the diameter decreases toward the receiving surface 43 of the valve element 27. Is done.

  Further, as shown in FIG. 3, the spring material 28a has a rectangular cross-sectional shape composed of a pair of short sides SS, SS parallel to each other and a pair of long sides LS, LS parallel to each other. The long sides LS are formed so as to have, for example, 1.3 times the length of the short sides SS.

  In addition, as shown in FIG. 4, when the valve element 27 is in a valve-opening state in which the valve portion 40 is separated from the valve seat 30 while the coil spring 28 is contracted, the coil spring 28 has the spring material 28a. Is formed to overlap in a direction orthogonal to the operation direction of the valve body 27. In the valve closed state of the valve body 27, that is, the valve portion 40 is seated on the valve seat 30, a part of the spring material 28a is preliminarily overlapped in a direction orthogonal to the operation direction of the valve body 27. Also good.

  Next, the operation of the first embodiment will be described. The coil spring 28 that urges the valve body 27 toward the side where the valve body 27 is seated on the valve seat 30 has a rectangular cross-sectional shape that is long in the operation direction of the valve body 27. Since the belt-shaped spring material 28a is wound, the valve body 27 is provided with resistance against vibration in a direction perpendicular to the operating direction of the valve body 27 from the spring material 28a. The vibration in the direction perpendicular to the operating direction, that is, the lateral vibration (pendulum vibration) can be damped, and the vibration generated in combination with this vibration, that is, the longitudinal vibration can also be suppressed. In addition, when the valve element 27 is separated from the valve seat 30, the space between the spring materials 28 a is narrowed by the contraction of the coil spring 28, so that the flow resistance by the coil spring 28 can be efficiently applied to the valve element. Therefore, the coil spring 28 itself can function as a flow resistance member, and it is not necessary to separately provide a dedicated flow resistance member, and the vibration of the valve element 27 is effectively achieved while facilitating assembly and simplifying the structure. Can be suppressed.

  Further, since the coil spring 28 is tapered so that the diameter thereof becomes smaller toward the receiving surface 43 side of the valve body 27, the centering effect of the valve body 27 can be obtained, and the vibration preventing effect can be enhanced. Even if the spring material 28a has a strip shape, the coil spring 28 can be easily expanded and contracted.

  The guide member 26 attached to the valve housing 25 has a cylindrical portion 26b that is coaxially surrounded by the shaft portion 41 of the valve body 27 and is inserted into the valve housing 26 and provided with a plurality of communication holes 37, 37. A guide hole 36 that slidably fits the shaft portion 41 is formed, and a support cylinder portion 26c that is integrally and coaxially connected to an end portion of the cylindrical portion 26b on the valve seat 30 side is provided. Since the outer surface of 26c is formed as a tapered surface 38 that increases in diameter toward the communication hole, and an annular spring receiving portion 42 that receives one end of the coil spring 28 is provided on the outer surface of the support cylinder portion 26c, the vicinity of the guide member 26 The fuel having reached 1 is guided by the outer surface of the support cylinder portion 26c and circulates to the communication holes 37, 37..., And the fuel can be smoothly circulated.

  In addition, when the coil spring 28 is contracted, a part of the spring material 28a overlaps in a direction orthogonal to the operating direction of the valve body 27. Therefore, when the valve body 27 is separated from the valve seat 30, the coil spring 28 contracts to spring material. The space | interval between 28a will become still narrower, and the flow resistance by the coil spring 28 can be provided to the valve body 27 more effectively.

  Here, when the vibration in the lateral direction is confirmed by an experiment with the valve body 27 to which the flow resistance is not applied and the valve body 27 to which the flow resistance is applied, the result is as shown in FIG. When confirmed, the result is as shown in FIG.

  In FIG. 5, the solid line indicates the lateral vibration generated in the valve element 27 to which flow resistance is applied, and the two-dot chain line indicates the horizontal vibration generated in the valve element to which no flow resistance is applied. Yes, it can be confirmed that lateral vibration can be suppressed by applying flow resistance.

  In FIG. 6, the solid line indicates the vertical vibration generated in the valve element 27 to which flow resistance is applied, and the two-dot chain line indicates the vertical vibration generated in the valve element to which no flow resistance is applied. It can be confirmed that the vibration in the vertical direction can be suppressed by providing the flow resistance portion 28a.

  A second embodiment of the present invention will be described with reference to FIG. 7, but the portions corresponding to the first embodiment are indicated by the same reference numerals and detailed description is omitted. To do.

  The check valve 24B includes a valve housing 25 provided with an inlet-side flow passage 29 and a valve seat 30 having the inlet-side flow passage 29 opened at a central portion, and a valve chamber 31 formed between the valve seat 30 and the valve housing 31. A guide member 26 fixed to the valve housing 25, a valve body 27 which can be seated on the valve seat 30 and guided by the guide member 26, and the valve body 27 with the valve seat 30. And a coil spring 44 biased toward the side of the seat.

  The coil spring 44 is formed by winding a strip-shaped spring material 44 a having a long rectangular cross-sectional shape in a direction orthogonal to the operation direction of the valve body 27, and is formed on the valve body 27. It is formed in a taper shape so as to decrease in diameter toward the receiving surface 43 side.

  Moreover, as in the first embodiment, the spring material 44a has a pair of short sides that are parallel to each other and a pair of long sides that are at least twice as long as the short sides and are parallel to each other. It is formed to have a rectangular cross-sectional shape composed of LS and LS.

  According to the second embodiment, the coil spring 44 that urges the valve element 27 toward the seating side of the valve seat 30 has a rectangular cross-sectional shape that is long in a direction perpendicular to the operation direction of the valve element 27. Since the strip-shaped spring material 44a is wound, resistance to vibration in the operation direction of the valve body 27 is applied from the spring material 44a to the valve body 27, so that vibration in the operation direction of the valve body 27, that is, Longitudinal vibration can be damped, and vibration generated in combination with this vibration, that is, lateral vibration (pendulum vibration) can also be suppressed. In addition, when the valve element 27 is separated from the valve seat 30, the space between the spring materials 44 a is narrowed by the contraction of the coil spring 44, so that the flow resistance by the coil spring 44 can be efficiently applied to the valve element. Accordingly, the coil spring 44 itself can function as a flow resistance member, and it is not necessary to separately provide a dedicated flow resistance member, and the vibration of the valve element 27 is effective while facilitating assembly and simplifying the structure. Can be suppressed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

  For example, in each of the above embodiments, the spring material 28a, 44a has a rectangular cross-sectional shape. However, a coil spring is formed by winding a spring material having an oval or elliptical cross-sectional shape. You may do it.

20 ... outlet side flow paths 24A, 24B ... check valve 25 ... valve housing 26 ... guide member 26b ... cylindrical part 26c ... support cylinder part 27 ... valve element 28, 44 ... Coil springs 28a, 44a ... Spring material 29 ... Inlet side channel 30 ... Valve seat 31 ... Valve chamber 36 ... Guide hole 37 ... Communication hole 38 ... Tapered surface 41 ... shaft portion 42 ... spring receiving portion 43 ... receiving surface

Claims (5)

  A valve housing (25) in which a valve seat (30) having an inlet-side flow path (29) opened and a valve chamber (31) facing the valve seat (30) is formed; A valve body (27) that can be seated on the seat (30), and a coil that is accommodated in the valve chamber (31) so as to bias the valve body (27) toward the side seated on the valve seat (30) In the check valve including the spring (28), the coil spring (28) is configured by winding a strip-shaped spring material (28a) having a long cross-sectional shape in the operation direction of the valve body (27). A check valve.   A valve housing (25) in which a valve seat (30) having an inlet-side flow path (29) opened and a valve chamber (31) facing the valve seat (30) is formed; A valve body (27) that can be seated on the seat (30), and a coil that is accommodated in the valve chamber (31) so as to bias the valve body (27) toward the side seated on the valve seat (30) In the check valve including the spring (44), the coil spring (44) is a strip-shaped spring material (44a) having a long cross-sectional shape in a direction orthogonal to the operation direction of the valve body (27). A check valve characterized by being wound.   The coil springs (28, 44) are tapered so as to decrease in diameter toward the receiving surface (43) formed on the valve body (27) so as to receive the coil springs (28, 44). The check valve according to claim 1, wherein the check valve is formed as follows.   A guide member (26) that forms the valve chamber (31) between the valve housing (25) and the valve seat (30) is attached to the valve housing (25). 27), a shaft portion (41) provided integrally therewith is coaxially surrounded and inserted into the valve housing (25), and communication holes (37) communicating with the outlet-side flow path (20) are provided at a plurality of locations in the circumferential direction. The cylindrical portion (26b) and a guide hole (36) for slidably fitting the shaft portion (41) are formed to be integrated with the end portion of the cylindrical portion (26b) on the valve seat (30) side. And a support cylinder part (26c) connected coaxially, and an outer surface of the support cylinder part (26c) is formed as a tapered surface (38) having a larger diameter toward the communication hole (37), and the guide The coil provided between the member (26) and the valve body (27) The check according to any one of claims 1 to 3, wherein an annular spring receiving portion (42) for receiving one end of the screw (28, 44) is provided on an outer surface of the support tube portion (26c). valve.   The coil spring (28) is formed so that a part of the spring material (28a) overlaps in a direction perpendicular to the operation direction of the valve body (27) when the coil spring (28) contracts. The check valve according to claim 1.

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