JP2009228737A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve for eliminating weak points of (1) the troublesomeness of frequently performing maintenance, (2) being uneconomical, (3) an increase in installation cost and (4) becoming severe in the restriction of a use place, in a fluid device such as an apparatus cooling system by devising so as to incorporate a strainer function into a check valve by paying attention to the check valve of a relatively simpler structure than a gate valve. <P>SOLUTION: This check valve has an inside flow passage 5 formed in a valve body 1, and a valve element 2 capable of abutting on a valve seat 9 being the valve inner side end of the inside flow passage 5, and constituted so that the valve element 2 can move over a closing position (t) for blocking up the inside flow passage 5 when the valve element abuts on the valve casing valve seat 9 and an opening position (h) for opening the inside flow passage 5 when the valve element 2 separates from the valve seat 9. A strainer 3 acting on fluid flowing in the flow passage 5 is integrally incorporated in an inclined attitude into the valve seat 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a check valve used in a drainage facility or the like provided in seawater, a river or the like.

  As an apparatus or facility having a check valve, for example, there is an equipment cooling system that cools water such as a river or a pond by pumping it up and passing it through equipment such as a heat exchanger or an engine. There existed a thing of a structure as shown in FIGS. 5-7 as a form of this apparatus cooling system.

  The apparatus cooling system K1 according to the first prior art shown in FIG. 5 is configured such that the water pumped up by the pump 21 passes through the check valve 22, the gate valve 23, and the strainer 24 in this order, and then is supplied to the apparatus 25 and drained. It is. In the equipment cooling system K2 according to the second prior art shown in FIG. 6, the water passing through the strainer 24 is pumped up by the pump 21, passes through the check valve 22 and the gate valve 23 in this order, and then passed through the equipment 25 to drain. It is a configuration. In the equipment cooling system K3 according to the third prior art shown in FIG. 7, the water pumped up by the pump 21 passes through the check valve 22, the gate valve 23, and the auto strainer 26 in this order, and then is supplied to the equipment 25 to be drained. It is a configuration.

  According to the first and second prior arts, it is necessary to assume that the strainer 24 is clogged, and there is the trouble that frequent maintenance is required. In the third prior art, a power source and control means for the auto strainer 26 are required, and construction costs for wiring, control panels, etc. are required separately, and running costs (electricity costs) are also incurred, which is uneconomical. is there. In the first and third prior arts, a dedicated installation location (foundation, etc.) for the strainer 24 and the auto strainer 26 is required, which is disadvantageous in that the installation cost increases. Further, in the second prior art, since the strainer 24 is provided below the pump 21, there is a disadvantage that the restriction on the place of use becomes severe that it is used in a relatively deep water storage place.

As conventional techniques of the check valve itself used in these conventional techniques, there are a disk type check valve disclosed in Patent Document 1 and a check valve disclosed in Patent Document 2 (so-called swing type check valve). Are known.
JP-A-10-252910 JP 2002-188740 A

  An object of the present invention is to focus on a check valve having a relatively simple structure compared to a gate valve, and devise so that the function of a strainer can be incorporated in the check valve. The purpose is to develop and provide a check valve that eliminates the disadvantages of frequent maintenance.

The invention according to claim 1 includes an internal flow path 5 formed inside the valve body 1 and a valve body 2 capable of abutting on a valve box valve seat 9 serving as a valve internal side end of the internal flow path 5. The valve body 2 is in contact with the valve seat 9 to close the internal flow path 5 and to the open position h away from the valve seat 9 to open the internal flow path 5. Check valve configured to be movable,
The valve seat 9 is provided with a strainer 3 that acts on a fluid flowing through the internal flow path 5.

  According to a second aspect of the present invention, in the check valve according to the first aspect, the valve body 2 is pivotally supported by the valve body 1 so as to be swingable about an axis P provided at one end thereof. Further, it is configured to be swingable between the closing position t and the opening position h.

  The invention according to claim 3 is the check valve according to claim 2, wherein the pivot axis P of the valve body 2 is provided above the valve seat 9, and the lower portion 9b of the valve seat 9 is It is characterized in that it is set in an inclined posture that protrudes downstream of the flow from the upper part 9a of the valve seat 9.

  According to a fourth aspect of the present invention, in the check valve according to the second or third aspect, the valve body 2 is provided with a protrusion 17 that contacts the strainer 3 at the same time as or during the transition to the closed position t. It is characterized by being.

  The invention according to claim 5 is characterized in that, in the check valve according to claim 4, the contacted portion 3A that is in contact with the protruding portion 17 in the strainer 3 is reinforced. .

  According to a sixth aspect of the present invention, in the check valve according to the fourth or fifth aspect, the strainer 3 is formed of a flexible material, and the strainer is brought into contact with the protruding portion 17 at the closed position t. 3 is set to bend.

  According to a seventh aspect of the present invention, in the check valve according to any one of the first to sixth aspects, the valve body 1 positioned on the upstream side and the lower side of the strainer 3 in the internal flow path 5 is disposed of dust. The receiving part 10 is formed.

  According to the first aspect of the present invention, since the check valve is provided with the strainer and the check valve with strainer is configured, the installation place is reduced as compared with the case where the check valve and the strainer are provided separately. Thus, space saving is realized, and it is possible to install in a place where the installation is impossible in the past. Thus, there are advantages in that the installation cost is reduced and the installation flexibility is excellent without reducing the function. As a result, paying attention to the check valve that has a relatively simple structure compared to the gate valve, the check valve is designed to incorporate the function of the strainer. For example, frequent maintenance is performed in fluid devices such as the equipment cooling system described above. Therefore, it is possible to develop and provide a check valve that eliminates the above disadvantages. Further, since the impact and vibration when the valve body moves to the closed position and comes into contact with the valve seat are directly transmitted to the strainer, dust and foreign matters captured by the strainer can be efficiently removed.

  According to invention of Claim 2, it is the structure which performs the movement over the closing position and opening position of a valve body by rocking | fluctuation movement, for example, compared with the case where it slides, and simplification of a structure and cost reduction are carried out. As a result, there is an advantage that the effect of the invention of claim 1 can be economically achieved.

  According to invention of Claim 3, a strainer can also be arrange | positioned in a tilting attitude | position by arrange | positioning a valve seat inclining. Accordingly, the surface of the strainer on which the dust or foreign matter is attached can be inclined downward, making it difficult for the dust or foreign matter to adhere to the strainer, and the effect of extending the effective operation time of the strainer (longer life) can be obtained. .

  According to the invention of claim 4, since the protrusion of the valve body can directly abut on the strainer and be excited as the check valve is closed, it is more efficient than dust and foreign matter adhering to the strainer. Therefore, it is possible to provide a check valve which can realize the advantage that can be removed by simple and economical means by providing a protrusion on the valve body.

  According to the fifth aspect of the present invention, since the contacted portion with which the protrusion hits is strengthened, deterioration and damage due to the contact between the protrusion and the contacted portion are prevented or suppressed. There exists an advantage which can implement | achieve the said effect by this invention, without causing the life shortening of a strainer.

  According to the invention of claim 6, the flexible strainer is set in a state of being bent by the protrusion due to the shift of the valve body to the closed position, and the impact of the protrusion on the strainer can be increased. It has become. As a result, the advantage that any one of the effects according to the invention of claim 4 or 5 can be enhanced is obtained.

  According to the invention of claim 7, dust and foreign matter falling from the strainer can be collected in the dust receiving portion, and scattering of dust and foreign matter in the internal flow path can be suppressed, There is an effect that foreign substances can be easily removed.

  Embodiments of a check valve according to the present invention will be described below with reference to the drawings. 1 is a sectional view showing the structure of the check valve, FIG. 2 is a side view of the check valve, FIG. 3 is a plan view of the strainer, FIG. 4 is a sectional view showing the check valve in an open state, and FIGS. These are the schematic diagrams which show the apparatus cooling system of the 1st-3rd prior art.

[Example 1]
As shown in FIGS. 1 and 2, the check valve A according to the first embodiment is pivotally supported by a valve body 1 having an upper cover 4 and a swingable axis P inside the valve body 1. It has a valve body 2 and a strainer 3. The valve body 1 is formed with an introduction-side internal flow path 5, a discharge-side internal flow path 6, and an upper opening 7 that is closed by the upper lid 4. Further, 5a is an introduction side mounting flange, 6a is a derivation side mounting flange, 7a is an opening flange, 8 is an inspection sight window for visually checking the accumulation of dust and foreign matter, 9 is a valve seat, and 10 is a valve body. Reference numeral 1 denotes a dust receiving portion formed by being locally recessed downward, and reference numeral 11 denotes a lower end cover provided on the left or right side of the dust receiving portion 10.

  In other words, the valve body 1 includes an internal flow path 5 formed inside the valve body 1 and a valve body 2 that can come into contact with a valve seat 9 that is an end inside the valve of the internal flow path 5. A closed position t (position shown in FIG. 1) that contacts the box valve seat 9 to close the internal flow path 5 and an open position h where the valve body 2 moves away from the valve seat 9 and opens the internal flow path 5. The check valve A is configured to be movable. As will be described later, a strainer 3 that filters the fluid flowing through the internal flow path 5 is integrally provided in the valve seat 9.

  As shown in FIGS. 1 and 2, the valve seat 9 traverses the internal flow paths 5 and 6 on the introduction side and the derivation side, and is inclined downward from the horizontal toward the derivation side from the introduction side to the angle θ (example: The valve seat wall 9H is integrally formed from the inside of the valve body 1 so as to have an inclined posture (30 to 45 degrees). Specifically, the upper surface of the valve seat wall 9H is the valve seat 9, and the annular contact surface 2M of the valve body 2 is also at an angle θ with respect to the valve axis X that is the center of the internal flow paths 5 and 6 at the closed position t. Tilted. That is, the valve seat 9 is set to an inclined posture in which the lower portion 9b of the valve seat protrudes in the direction of the axis X of the internal flow path 5 from the upper portion 9a of the valve seat with respect to the upper portion 9a of the valve seat. ing. In order to improve the sealing performance (sealing performance) with the valve body 2 in the closed state, the valve seat 9 is preferably provided with an annular seal ring 12 made of an elastic material (rubber or the like).

  As shown in FIGS. 1 to 4, the valve seat 9 is integrally incorporated with a strainer 3 that acts on the fluid flowing through the internal flow path. The strainer 3 is a cross-shaped reinforcing member in which a circular filter member 14 formed in a wire mesh shape is stretched (stretched) on a frame body 15 made of an annular plate material and has a center seat 16a. 16 is provided integrally. The filtering member 14 has flexibility with respect to the force in the direction intersecting the valve seat surface applied to the abutment seat 16a due to the attachment structure to the frame body 15 (in essence, The filtration member 14 exerts elasticity against pushing the center or its peripheral part), but the member itself such as rubber or soft synthetic resin may be formed of a flexible material.

  As shown in FIGS. 1, 2, and 4, the valve body 2 is attached to the valve body 1 via a support shaft 13 so as to be swingable about a lateral axis P provided at an upper end portion (an example of one end portion). It is pivotally supported and is configured to be swingable between a closed position t and an open position h. That is, a boss portion 2a that is rotatably fitted to the support shaft 13 is formed at the tips of a pair of arms 2A and 2A that extend upward from the circular valve body 2 at two left and right positions. The contact surface 2M is in contact with the valve seat 9 via the seal ring 12 due to its own weight and is in the closed position t, and is in the closed state (state shown in FIG. 1) as the check valve A.

  The valve body 2 is provided with a projection 17 that contacts the central portion of the strainer 3 as the valve body 2 moves to the closed position t. (Example) 3A is strengthened by placing the seat 16a as described above. That is, as the valve body 2 at a position other than the closing position t such as the maximum opening position hmax moves downward and moves to the closing position t, the projecting portion 17 comes into contact with the abutment seat 16a and impacts or vibrates on the filter member 14. Therefore, the action of shaking off foreign matters such as dust adhering to the filter member 14 can be expected.

  Further, a convex portion 18 for defining the maximum opening position hmax is formed on the upper surface side of the valve body 2, and the convex portion 18 comes into contact with the receiving portion 4 a formed on the inner surface side of the upper lid 4. Thus, the maximum opening position hmax is determined. That is, when the valve body 2 is in an angle range between the closing position t and the maximum opening position hmax, it can be defined as the opening position h. The strainer 3 is detachably incorporated in a state in which the strainer 3 is fitted into the inner peripheral portion 19 of the valve seat wall 9H that forms the valve inner side end of the introduction side internal flow path 5, and the seal ring 12 is disposed on the upper side thereof. Has been. Therefore, when the valve body 2 is in the closed position t, better sealing performance can be obtained if the seal ring 12 is slightly compressed and deformed in the thickness direction.

  Next, the operation of the check valve A will be described. When no fluid such as water is supplied to the introduction-side internal flow path 5, the valve body 2 swings and moves to the closed position t by its own weight. As shown in FIG. Further, if fluid flows backward from the outlet-side internal flow path 6, fluid pressure is applied to the weight of the valve body 2 described above, and the valve body 2 is held more firmly at the closed position t. In other words, the valve is closed (the state shown in FIG. 1), and the check action is exhibited.

  When a positive pressure due to the supply of fluid to the introduction-side internal flow path 5 acts from the strainer side, and when a negative pressure acts due to suction or the like to the lead-out side internal flow path 6, the positive pressure Alternatively, the valve element 2 is moved up and down around the axis P due to the negative pressure to shift to the open position h or the maximum open position hmax, and the check valve A is opened. FIG. 4 shows a valve open state in which the convex portion 18 is opened to the maximum opening position h where the convex portion 18 abuts on the receiving portion 4a, but in reality, the momentum and unit time of the fluid flowing through the internal flow paths 5 and 6 are shown. Depending on the hit amount, as described above, the valve body 2 is often in the open state at the open position h between the closed position t and the maximum open position hmax.

  When the valve body 2 swings downward from the open position h and returns to the closed position t and comes into contact with the valve seat 9, at the same time, the projection 17 also comes into contact with the abutment seat 16a so as to give an impact or vibration to the filter member 14. The dust or foreign matter adhering to or caught on the introduction-side internal flow path 5 side of the filtration member 14 is shaken off, and the upstream side of the strainer 3 (upstream side in the flow direction of the fluid flowing through the internal flow path 5) and below As a result, the clogging of the filter member 14 can be prevented or suppressed.

  That is, every time the valve body 2 returns to the closed position t, the strainer 3 is excited, and in combination with the structure in which the filtering member 14 is inclined and the fall of dust / foreign matter is promoted, the attached dust / foreign matter is effectively dropped. Thus, it becomes possible to maintain the strainer 3 in a clean state without using a special or dedicated strainer excitation means. In addition, the state of storage of dust / foreign matter in the dust receiving unit 10 can be visually confirmed from the inspection viewing window 8. When the amount of dust / foreign matter is accumulated more than a specified amount, the lower end lid 11 can be opened to remove the accumulated dust / foreign matter. .

  For example, if the check valve A configured as described above is introduced in the equipment cooling system K1 shown in FIG. 5 in place of the conventional check valve 22, the dedicated strainer 24 can be omitted, and the necessary function is reduced. It can be used as a check valve with strainer that can reduce the arrangement space and cost.

[Another Example]
Although illustration is omitted by increasing the protruding amount of the protruding portion 17, the strainer 3 made of a flexible material is specifically contacted with the protruding portion 17 when the valve body 2 is in the closed position t. The check valve A may be set so that the filtering member 14 is bent. In this configuration, there is an advantage that the impact or vibration applied to the filter member 14 when the valve body 2 is closed and returns to t is increased, and the dust and foreign matter shake-off action is enhanced. The material of the filtering member 14 may be a synthetic resin, rubber, or the like, in addition to a metal mesh such as a stainless mesh.

Sectional view showing structure of check valve (Example 1) 1 is a side view of a partially cutaway check valve of FIG. Plan view showing strainer structure Sectional drawing which shows the open state of the non-return valve of FIG. Schematic diagram of equipment cooling system according to the first prior art Schematic diagram of equipment cooling system according to second prior art Schematic diagram of equipment cooling system according to 3rd prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve body 2 Valve body 3 Strainer 3A Contacted part 5 Internal flow path 9 Valve box valve seat 9a Upper part of valve seat 9b Lower part of valve seat 10 Dust receiving part 17 Protrusion part P shaft center X Center of internal flow path h Open position t Close position

Claims (7)

An internal flow path formed inside the valve body, and a valve body capable of abutting a valve box valve seat which is an end inside the valve of the internal flow path, the valve body abutting against the valve seat A check valve configured to be movable between a closed position for closing the internal flow path and an open position for opening the internal flow path away from the valve seat,
A check valve in which a strainer that acts on a fluid flowing through the internal flow path is provided in the valve seat.   The valve body is pivotally supported by the valve body so as to be swingable about an axis provided at one end thereof, and is configured to be swingable between the closed position and the open position. The check valve according to Item 1.   The swing axis of the valve body is provided on the upper side of the valve seat, and the lower portion of the valve seat is set to an inclined posture that protrudes downstream of the flow from the upper portion of the valve seat. Check valve described in 1.   4. The check valve according to claim 2, wherein the valve body is provided with a projecting portion that contacts the strainer at the same time as the process of moving to the closed position or at the same time.   The check valve according to claim 4, wherein a contacted portion that is in contact with the protruding portion of the strainer is reinforced.   The check valve according to claim 4 or 5, wherein the strainer is formed of a flexible material, and the strainer is set to be bent by contact with the protruding portion in the closed position.   The check valve according to any one of claims 1 to 6, wherein a dust receiving portion is formed in the valve body located upstream and below the strainer in the internal flow path.

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