JP2012241855A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve which has a small number of components, requires less assembling man-hours and has a remarkably reduced pressure loss and which is adaptable to highly corrosive fluid by using resin heavily.SOLUTION: A check valve 10 includes a valve cage 11, a valve stem 12, a valve element 13, a valve seat 14, a spring presser 15 and a spring 16. In the check valve 10, body ribs 11c are provided inside the valve cage 11, through-grooves through which the body ribs passes are provided on an outer periphery of the spring presser. At a predetermined angle with respect to the through-grooves, supporting grooves are evenly spaced. The valve stem of an assembly of the valve stem 12, the valve element 13, the valve seat 14 and the spring 16 is inserted into a valve stem through hole of the spring presser 15 and the spring presser 15 is integrated into the valve cage 11, thereby arranging the valve stem 12 freely movable within the valve cage 11.

Description

  The present invention relates to a check valve used for piping of a pump having a medium diameter of 300 mm or less.

  FIG. 1 is a diagram showing a cross-sectional configuration of this type of conventional check valve. FIG. 1 (a) shows the check valve in an open state, and FIG. 1 (b) shows the check valve in a closed state. A check valve 100 used for piping of a medium-diameter pump having a diameter of 300 mm or less includes a valve box 101, a valve body 102, a spring retainer 103, a spring 104, a valve seat 105, a valve stem 110, and a seat abutment plate 106. I have. The valve box 101 is made of cast metal, and SUS press products are used for the valve body 102, the spring presser 103, and the like disposed in the valve box 101. Reference numeral 107 denotes a presser ring for fixing the spring presser 103.

  In the check valve 100 configured as described above, when the valve is open, the valve body 102 is pushed toward the valve outlet 111 against the elastic force of the spring 104 by the fluid pressure flowing from the inlet 108, and the valve seat of the valve body 102 is 105 is separated from the valve seat 109, and the fluid flowing in from the inlet 108 flows as indicated by an arrow A and flows out from the valve outlet 111. When the inflow of the fluid stops, the valve body 102 is pushed by the elastic force of the spring 104, the valve seat 105 of the valve body 102 contacts and comes into close contact with the valve seat 109, and the fluid flows in (backflow) from the valve outlet 111. However, the fluid is blocked and prevented by the valve body 102.

The conventional metal check valve shown in FIG. 1 is strong and has been widely used since ancient times. However, it has the following drawbacks.
・ In order to use a pressed product for a part of a part, it is necessary to manufacture a mold for pressing, and there is a cost for manufacturing the mold.
-Due to the structure of the valve body 102, the spring retainer 103, the seat abutment plate 106, etc., the pressure loss is large.
・ Furthermore, if the fluid to be used is seawater etc., corrosion cannot be completely prevented even if a corrosion resistant material such as stainless steel is used, and if a material with higher corrosion resistance is used, it becomes more expensive than metal. Some customers want a plastic check valve.

Japanese Utility Model Publication No. 5-22954

The conventional check valve has the following problems.
-Considering the conventional metal check valve from the cost aspect, the conventional metal check valve often uses a pressed product for some parts such as the spring retainer 103 and the seat abutment plate 106 (300 mm or more). Large diameters may be made from castings.) In the case of pressing a metal thin plate, a mold must be manufactured, and the manufacturing cost of the mold greatly affects the manufacturing cost of the check valve 100.
Further, the conventional metal check valve 100 has a large number of parts such as the fixing ring 107 for fixing the spring retainer 103, and the assembly work becomes complicated. In addition, the large number of parts directly increases the cost.

-From the viewpoint of pressure loss, the metal check valve 100 is configured such that the fluid does not pass through the spring retainer 103 and the seat contact plate 106 which are one of the components of the check valve 100 as they are. You must make a window that allows water to pass through in place. If the window for allowing water to pass through is large, there is a lot of fluid and pressure loss does not become a big problem, but if the window is made too large, the strength is insufficient and an unlimitedly large window cannot be made.

In addition, the positions of the spring retainer 103 and the sheet abutment plate 106 are structurally positioned so as to abut against (flow against) the fluid flow. If the fluid flow direction is not changed, the fluid moves the spring retainer 103 and the sheet abutment plate 106. Do not pass. Therefore, even if the fluid passage window is opened, the spring retainer 103 and the sheet abutment plate 106 cause a large pressure loss.
・ If the pressure loss is large, a large amount of energy is generated in the transfer of the fluid, which indirectly adversely affects the global environment.
・ Depending on the customer, a highly corrosive fluid may be used for the handling liquid. In such a case, metal parts may not be used, and a resin check valve may be required.

  The present invention has been made in view of the above points. The check valve has a small number of parts, a small number of assembly steps, can significantly reduce pressure loss, and can deal with highly corrosive fluids by using a lot of resin. The purpose is to provide.

  In order to solve the above-described problems, the present invention provides a valve box having a fluid inlet and an outlet, a valve stem disposed in the valve box, a valve body fixed to the valve stem, and the valve A valve seat fixed to the body, a spring presser fixed in the valve box and formed with a valve stem through hole through which the valve stem passes, and the valve body and the spring presser located on the outer periphery of the valve stem In the check valve provided with a spring that is disposed between the springs and biases the valve body in the valve closing direction by an elastic force, a plurality of main body ribs are provided inside the valve box, and the spring retainer On the outer periphery, the same number of through grooves as the main body ribs through which the main body ribs penetrate are provided, and the same number of support grooves as the main body ribs provided at equal intervals with respect to the through grooves are provided. The valve stem, the valve body, and the valve casing disposed in the valve box By inserting the valve stem of the assembly of the spring and the spring into the valve stem through hole of the spring retainer and incorporating the spring retainer into the valve casing, the valve stem is inserted into the valve casing and the inlet and the flow path. The check valve is arranged to be movable in a linear direction connecting the outlets.

  Further, according to the present invention, in the check valve, the spring retainer is assembled by fitting the main body rib into the through groove provided on the outer periphery of the spring retainer and dropping it into a notch provided in the main body rib. The spring retainer is rotated by the predetermined angle θ in a plane perpendicular to the valve stem at the notch position, the support groove is aligned with the main body rib, and the support groove and the main body rib are fitted by the reaction force of the spring. And the spring retainer is fixed.

  Further, in the check valve according to the present invention, the number of the body ribs is n (n is an integer of n ≧ 2), the predetermined angle θ is related to the number n of the body ribs, and θ = 360 °. / (2 × n).

  Moreover, the present invention is characterized in that, in the check valve, the main body rib is disposed substantially in parallel with a flow direction of a fluid flowing in the valve box.

  In the check valve according to the present invention, the spring retainer includes an opening through which the fluid flows in a plane orthogonal to the flow of the fluid.

  Further, according to the present invention, in the check valve, the valve box, the spring retainer, the valve body, the valve seat, the valve stem, and a nut that couples the valve stem and the valve body are made of resin. It is characterized by being.

  In the check valve according to the present invention, the resin is pentam (polydicyclopentagen).

  In the check valve according to the present invention, the valve box is integrally formed.

  In the present invention, a plurality of main body ribs are provided on the inner side of the valve box, and the same number of through grooves as the main body ribs through which the main body ribs pass are provided on the outer periphery of the spring presser, and the predetermined number of through grooves are defined. The same number of support grooves as the body ribs that are equally spaced at an angle θ are provided, and the valve stem of the valve stem, valve body, valve seat, and spring assembly arranged in the valve box is spring-loaded. By inserting the spring presser into the valve box and inserting the spring retainer into the valve box, the valve rod is arranged in the valve box so as to be freely movable in the linear direction connecting the inlet and outlet. A check valve having an effect can be provided.

  -It is possible to use many resin products without using pressed parts, and the number of parts can be reduced. Further, the check valve can be made of resin, and the metal check valve does not require a fixing ring that is necessary for fixing the spring presser, and the number of parts can be reduced. This reduces production costs and facilitates assembly.

  -By installing the main body rib substantially parallel to the fluid flow direction, pressure loss can be remarkably reduced, and energy saving can be improved.

  -By using a lot of resin, a check valve suitable as a check valve for handling highly corrosive fluid can be provided.

It is a figure which shows the cross-section of the conventional check valve. It is a figure showing the section structure in the state where the valve of the check valve concerning the present invention closed. It is a figure showing the section structure in the state where the valve of the check valve concerning the present invention opened. It is a figure which shows the structure of the spring retainer of the non-return valve which concerns on this invention. It is a figure which shows the structure of the valve box of the non-return valve which concerns on this invention. It is a figure which shows the relationship between the spring retainer of the non-return valve which concerns on this invention, and a valve box. It is a figure which shows the diameter dimension relationship of each part of the non-return valve which concerns on this invention. It is a figure which shows the method for equalizing the flow path diameter of the fluid inlet / outlet from which the diameter of the non-return valve which concerns on this invention differs. It is a figure which shows the method for equalizing the flow path diameter of the fluid inlet / outlet from which the diameter of the non-return valve which concerns on this invention differs.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 2 to 5 are views showing the structure of the check valve according to the present invention. FIG. 2 is a longitudinal section showing a state where the check valve is closed. FIG. 3 is a longitudinal section showing a state where the check valve is opened. FIG. 4 is a view showing the structure of a spring presser of a check valve according to the present invention, FIG. 4 (a) is a plan view, FIG. 4 (b) is a cross-sectional view taken along the arrow AOB, and FIG. 5A and 5B are views showing the structure of a valve box, in which FIG. 5A shows a cross section taken along the arrow A--B, and FIG. 5B shows a cross section taken along the line C-C. As shown in the figure, the check valve 10 according to the present invention includes a valve box 11, a valve rod 12, a valve body 13, a valve seat 14, a spring retainer 15, and a spring 16.

  As shown in FIG. 5, the valve box 11 is substantially cylindrical and includes an inlet 11a through which fluid flows into one end, and an outlet 11b through which fluid flows out at the other end, and a plurality of (four in the figure) inner peripheral surfaces. This is a structure in which the main body ribs 11c are provided equally in a linear direction connecting the inflow port 11a and the outflow port 11b. The end of the main body rib 11c on the outlet 11b side is an inclined surface 11d, and the bottom surface of the valve box 11 is a valve seat surface 11e with which the surface of the valve seat 14 on the side opposite to the valve body 13 abuts. A notch 11f is formed between the lower end of the inclined surface 11d of the main body rib 11c and the valve seat surface 11e. The valve box 11 is integrally manufactured from a resin material such as pentam (polydicyclopetagen). Manufacture of the valve box 11 is a manufacturing method in which a resin melted in a mold is poured and formed integrally.

  As shown in FIG. 4, the spring retainer 15 has a flat circular shape, and has the same number (four in the figure) of through grooves 15 a as the number of the main body ribs 11 c through which the main body ribs 11 c of the valve box 11 penetrate. A support groove 15b is formed between the through groove 15a and the through groove 15a on the outer periphery. Openings 15c through which a plurality of (four in the figure) fluids pass are formed in the spring retainer 15 at equal intervals, and a valve rod through hole 15d through which the valve rod 12 passes is formed in the center. A spring engaging recess 15e is formed at one end of the center portion of the spring retainer 15 so that one end of the spring 16 engages.

  As shown in FIGS. 2 and 3, the valve stem 12 has a cylindrical shape, and a thread groove portion (not shown) into which a nut 17 is screwed is formed at one end, and the other end of the spring 16 is interposed between the one end and the other end. An engaging large diameter portion 12b is formed.

  The valve body 13, the valve seat 14, and the seat abutment plate 18 are inserted into the lower end of the large-diameter portion 12 b of the valve stem 12 into the valve stem insertion holes formed at the center portions thereof, and formed at one end of the valve stem 12. A nut 17 is screwed into the thread groove and tightened to form a valve stem assembly including the valve stem 12, the valve body 13, the valve seat 14, and the seat abutment plate 18. Then, with one end of the spring 16 engaged with the large diameter portion 12b of the valve stem 12 of this valve stem assembly, the nut 17 of the valve stem assembly is inserted toward the inlet 11a side of the valve box 11. . Then, the valve stem 12 is inserted into the valve stem through hole 15d provided at the center of the spring retainer 15, the main body rib 11c is inserted into the through groove 15a provided at the outer peripheral portion, and the spring retainer 15 is moved along the main body rib 11c. It drops down to the position of the notch 11f in FIGS.

  The spring retainer 15 is rotated by 45 ° in a plane perpendicular to the valve stem 12 with the spring retainer 15 lowered to the position of the notch 11 f, so that the spring retainer 15 is moved to the outlet 11 b side by the elastic force of the spring 16. The one end of the notch portion 11f of the main body rib 11c is fitted into the support groove 15b of the spring retainer 15, the spring retainer 15 is fixed to the valve box 11, and the check valve 10 is assembled.

  In order to assemble the check valve 10 as described above, the outer diameter of the outlet 11b of the valve box 11: A, the outer diameter of the spring retainer 15: A, the outer diameter of the valve body 13 and the valve seat 14 Dimension: c, bore size between the body ribs 11c of the valve box 11: d, bore size of the inlet 11a of the valve box 11: o, a, i, c, d, o, as shown in FIG. It is necessary to satisfy the following dimensional relationship: a> i> d> u> e.

  When fluid flows into the inlet 11a of the check valve 10 having the above-described configuration and the valve seat 14 is pressed against the elastic force of the spring 16 by the pressure, the valve body 13, the valve seat 14, and the seat abutment plate 18 are pressed. As shown in FIG. 3, the valve stem assembly including the valve stem 12 moves in the valve box 11 along the straight line connecting the inlet 11a and the outlet 11b toward the outlet 11b. As a result, as shown by an arrow D in FIG. 3, the fluid flowing into the valve box 11 from the inlet 11a passes through the valve box 11 between the main body rib 11c and the main body rib 11c, and through the opening 15c of the spring retainer 15. It flows to the outlet 11b side and flows out from the outlet 11b. At this time, the longitudinal direction of the plurality of (four in this embodiment) main body ribs 11c provided on the inner wall of the valve box 11 and the direction of the opening 15c of the spring retainer 15 are in relation to the flow direction of the fluid flowing in the valve box 11. Therefore, the pressure loss can be remarkably reduced.

  As described above, the check valve 10 according to the present invention eliminates the need for the presser ring 107 for fixing the spring presser 103 to the valve box 101 unlike the conventional metal check valve shown in FIG. The number of points is reduced and the assembly is simplified.

  Although the number of the main body ribs 11c has been described here as four, it is not limited to this, and it may be selected from n (n ≧ 2) according to the size of the pipe diameter to which the check valve 10 is attached. Moreover, the main body rib 11c is arrange | positioned equally on the inner wall of the valve box 11 according to the main body rib 11c. That is, the angle is set at 360 ° / n.

  The through grooves 15a for penetrating the main body ribs 11c provided on the outer periphery of the spring retainer 15 are arranged at equal intervals according to the number of the main body ribs 11c. Further, the support groove 15b provided on the outer peripheral portion of the spring retainer 15 has the main body rib at a position having an angle θ = 360 ° / (2 × number of main body ribs 11c) with respect to the through groove 15a through which the main body rib 11c passes. The same number as 11c is installed equally. The rotation angle θ in the plane perpendicular to the valve stem 12 at the notch 11f of the main rib 11c of the valve box 11 is θ = 360 ° / (2 × number of main ribs 11c).

  Further, from the viewpoint of pressure loss, when the check valve 10 according to the present invention is discussed, when the valve is opened by the pressure of the fluid flowing in from the inlet 11a as shown in FIG. 3, the conventional reverse valve shown in FIG. The fluid flows into the valve box 11 of the check valve 10 without being obstructed by the seat contact plate 106 unlike the stop valve 100. The fluid flows linearly from the inlet 11a of the valve box 11 toward the outlet 11b. Again, the direction of the main body rib 11c of the valve box 11 is set in the fluid flow direction, and the fluid flows toward the outlet port 11b without being blocked by the flow.

  In addition to the fluid flowing in the valve box 11 along the main body rib 11c as described above, a part of the fluid also hits the spring retainer 15, but the spring retainer 15 also enters the spring retainer 15 from the inlet 11a side as shown in FIG. An opening 15c is provided in the direction toward the outflow port 11b, and the fluid can freely flow. As described above, the check valve 10 according to the present invention does not have a structural part that resists the flow of fluid as compared with the check valve of the conventional structure, so that the pressure loss is remarkably reduced. Reduction of the pressure loss of the check valve 10 leads to energy saving of the device to which the check valve 10 is attached.

  Further, the check valve 10 according to the present invention can be manufactured by a valve box 11, a spring retainer 15, a valve body 13, a seat abutment plate 18, a valve stem 12, and a nut 17 made of pentam resin, and the valve seat 14 made of rubber. Yes, if these are made of pentam resin or rubber, even if the handling fluid is a highly corrosive handling liquid, it is sufficient to use a highly corrosion-resistant material such as Ti material or duplex stainless steel for the spring 16 Yes, and the price can be kept to a minimum.

  In the check valve 10, the diameter of the inlet 11 a of the valve box 11 is different from that of the outlet 11 b (A> O). An example of aligning the flow path diameter on the inlet / outlet side of the check valve 10 will be described with reference to FIGS. One method for aligning the flow path diameter on the inlet / outlet side of the check valve 10 is to connect a bolt 21 to a flow path diameter adjusting pipe 20 for adjusting the flow path diameter on the outlet 11b side of the valve box 11 as shown in FIG. The diameter of the outlet 20b of the flow path diameter adjusting pipe 20 is the same as the diameter of the inlet 11a of the valve box 11: O. The diameter of the inlet end of the flow path diameter adjusting pipe 20 is the same as the diameter of the outlet 11b of the valve box 11: a continuous shape from the end of the outlet 11b to the end of the outlet 20b. The flow path.

  Further, as shown in FIG. 9, a ring fitting step portion 22 for fitting a flow path diameter adjusting ring 23 is provided on the side wall surface of the outlet 11 b of the valve box 11, and the flow passage diameter adjustment is provided in the ring fitting step portion 22. The ring 23 for use is fitted. The diameter of the outlet end of the flow path diameter adjusting ring 23 is the same as the diameter of the inlet 11a of the valve box 11: o. And it is set as the shape which continued from the outflow port 11b of the valve box 11 to the edge part of the outflow port 23b of the ring 23 for flow path diameter adjustment.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape or structure not directly described in the specification and drawings is within the technical scope of the present invention as long as the effects of the present invention are achieved. For example, in the above-described embodiment, the main body ribs are equally distributed in the circumferential direction. However, the main body ribs are not necessarily evenly distributed, and the spring presser is balanced when the support groove of the spring presser and the main body rib are fitted. It only needs to be arranged so that it can be well supported.

  In the present invention, the main body ribs are provided at equal intervals on the inner side of the valve box, and the same number of through grooves as the main body ribs through which the main body ribs pass are provided at the outer periphery of the spring presser. The same number of support grooves as the main body ribs provided at equal intervals with a predetermined angle θ are provided, and the valve rod of the valve rod, valve body, valve seat and spring assembly arranged in the valve box is spring-loaded. Inserting the presser foot into the valve stem through hole and incorporating the spring presser into the valve box makes it possible to move the valve stem into the valve box so that it can be moved freely. Can be a check valve capable of.

  Also, the check valve can be made of resin, and the metal check valve eliminates the need for a fixing ring that was necessary to fix the spring retainer, reducing the number of parts and reducing production costs. As well as reducing, assembly becomes easy.

  Further, the main body rib can be used as a check valve that can significantly reduce pressure loss and improve energy saving by being installed substantially parallel to the fluid flow direction. Furthermore, by using a lot of resin, it can be used as a check valve suitable as a check valve for handling highly corrosive fluid.

DESCRIPTION OF SYMBOLS 10 Check valve 11 Valve box 12 Valve rod 13 Valve body 14 Valve seat 15 Spring presser 16 Spring 17 Nut 18 Seat contact plate 20 Flow path diameter adjustment pipe 21 Bolt 22 Ring fitting step part 23 Flow path diameter adjustment ring

Claims (8)

A valve box having a fluid inlet and outlet, a valve rod disposed in the valve box, a valve body fixed to the valve rod, a valve seat fixed to the valve body, and a valve seat A spring retainer that is fixed and has a valve stem through-hole through which the valve stem penetrates, is located on the outer periphery of the valve stem, and is disposed between the valve body and the spring retainer. In a check valve with a spring that biases in the valve closing direction,
A plurality of body ribs are provided inside the valve box,
The outer periphery of the spring retainer is provided with the same number of through grooves as the main body ribs through which the main body ribs penetrate, and the same number of the main body ribs provided at equal intervals with the through grooves at a predetermined angle θ. Support groove is provided,
Inserting the valve stem of the valve stem, the valve body, the valve seat, and the spring assembly disposed in the valve casing into the valve stem through hole of the spring presser, and inserting the spring presser into the valve casing A check valve characterized in that the valve rod is disposed in the valve box so as to be freely movable in a linear direction connecting the inlet and the outlet. The check valve according to claim 1,
The spring retainer is assembled by fitting the main body rib into the through groove provided on the outer periphery of the spring retainer and dropping it into the notch provided in the main body rib, and at the position of the notch, the spring retainer is attached to the valve stem. The support groove is rotated by the predetermined angle θ in an orthogonal plane, the support groove is aligned with the main body rib, and the support groove and the main body rib are fitted by the reaction force of the spring to fix the spring presser. Check valve. The check valve according to claim 1 or 2,
The number of the main body ribs is n (n is an integer of n ≧ 2), and the predetermined angle θ is related to the number n of the main body ribs, and θ = 360 ° / (2 × n). Check valve. The check valve according to any one of claims 1 to 3,
The check valve according to claim 1, wherein the main body rib is disposed substantially parallel to a flow direction of a fluid flowing in the valve box. The check valve according to any one of claims 1 to 4,
The check valve is characterized in that an opening through which the fluid flows is provided in a plane orthogonal to the flow of the fluid. The check valve according to any one of claims 1 to 5,
The check valve according to claim 1, wherein the valve box, the spring retainer, the valve body, the valve seat, the valve rod, and a nut that couples the valve rod and the valve body are made of resin. The check valve according to claim 6,
The check valve is characterized in that the resin is pentam (polydicyclopentagen). The check valve according to any one of claims 1 to 7,
The check valve is integrally formed with the check box.

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