JP2014047860A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve with a pressure relief valve having a reduced manufacturing cost.SOLUTION: A main valve of a check valve 18 comprises: a check valve seat 31 internally disposed on a case 30; a check valve body 37 supported in the opening and closing direction; a packing 45 attached to the check valve body 37; and a spring 44 which biases the packing 45 in the direction of the check valve seat 31. A pressure relief valve comprises: a valve hole 40 formed on the check valve body 37; an inner annular part 45b of the packing 45 which functions as a valve body; and a spring 47 which biases the inner annular part 45b in the direction of the check valve body 37 in which the valve hole exists. The valve body of the pressure relief valve is shared with a part of the packing 45 as the valve body of the main valve and, thereby, a component which constitutes the valve body of the pressure relief valve is made unnecessary. The spring 47 of the pressure relief valve is configured so as to be arranged on the outer circumference of a second shaft part 39 of the primary side, thereby, it is prevented that the size of the component becomes too small as compared to the case of being internally disposed in the shaft part and the assembling operability is improved.

Description

  The present invention relates to a check valve, and in particular, in a hot water supply device, the hot water that comes out first from a faucet or the like becomes hot when applied to a mixing valve that mixes hot and cold water into hot water. The present invention relates to a check valve used for preventing the above.

  In a hot water supply apparatus, a check valve is used in a faucet device to which a water supply pipe and a hot water supply pipe are connected for the purpose of preventing backflow of water or hot water. In addition to the original backflow prevention function, the check valve includes a pressure relief valve that can release the abnormally high pressure to the primary side when the pressure on the secondary side of the check valve becomes abnormally high. Some have a function (see, for example, Patent Document 1). The cause of the abnormally high pressure is that cold water confined in the piping on the secondary side of the check valve expands due to heating or increases in volume due to freezing.

  According to the check valve described in Patent Document 1, the shaft that supports the check valve body in the opening / closing direction has a relief passage communicating from the secondary side to the primary side, and is formed in the relief passage. The pressure relief valve is configured to urge the relief valve body from the primary side so as to close the narrowed portion. The relief valve element receives the pressure on the secondary side through the constriction, and when the pressure on the secondary side exceeds a predetermined value, it opens away from the constriction and opens the secondary pressure to the primary. Miss to the side. In this way, when the pressure relief valve releases the abnormally high pressure on the secondary side of the check valve to the primary side, the secondary side piping is destroyed by the high pressure, causing water leakage or parts of the check valve being destroyed. Is prevented.

JP 2010-96298 A

  However, in the conventional check valve, since the pressure relief valve is configured inside the shaft portion of the check valve, the component dimensions of the relief valve body (seal member) and the biasing member are inevitably reduced. As a result, the assembling workability deteriorates, and there is a problem that the manufacturing cost increases.

  This invention is made | formed in view of such a point, and it aims at providing the nonreturn valve with the pressure relief valve which reduced the manufacturing cost.

  In the present invention, in order to solve the above problems, a cylindrical case having a check valve seat on the primary side inside, a bearing portion coaxially disposed on the axis of the case on the secondary side of the case, A check valve body supported by the bearing portion so as to be movable in a direction to be seated on or separated from the check valve seat, and a packing disposed on the check valve seat side of the check valve body; A first spring for urging the check valve body in a direction in which the packing is seated on the check valve seat, a valve hole formed in the check valve body and opened and closed by the packing, and the valve And a second spring for urging the packing in a direction to close the hole.

  According to such a check valve, the packing serves as both a check valve seal member and a pressure relief valve seal member. Thereby, since it is not necessary to prepare the seal member of the pressure relief valve as one component, the cost can be reduced.

  The check valve with the above configuration does not constitute a pressure relief valve in the check valve body supported by the bearing portion, but is configured outside the check valve body and uses a seal member as the check valve. This eliminates the need for a pressure relief valve sealing member, and has the advantage of reducing the manufacturing cost. Further, since there are no extremely small parts that can be accommodated in the check valve body, there is an advantage that the check valve can be assembled relatively easily.

It is a system configuration figure showing an example of a hot-water supply device to which the check valve concerning a 1st embodiment is applied. It is a center longitudinal cross-sectional view which shows the valve closing state of the non-return valve which concerns on 1st Embodiment. It is a center longitudinal cross-sectional view which shows the axial part and check valve body of a check valve which concern on 1st Embodiment. It is an AA arrow sectional view of Drawing 3 showing a shaft part and a check valve body of a check valve concerning a 1st embodiment. It is a center longitudinal cross-sectional view which shows the valve opening state of the non-return valve which concerns on 1st Embodiment. It is a center longitudinal cross-sectional view which shows the valve opening state of the pressure relief valve with which the non-return valve which concerns on 1st Embodiment is provided. It is a top view showing packing of a check valve concerning a 2nd embodiment. It is a figure which shows the non-return valve body and packing of the non-return valve which concerns on 3rd Embodiment, (A) is the figure which looked at the non-return valve body from the 2nd axial part side, (B) It is the figure which looked at packing from the check valve body side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, taking as an example the case of application to a water supply line of a mixing valve in a hot water supply apparatus. Each embodiment can be implemented by combining a plurality of embodiments within a consistent range.

FIG. 1 is a system configuration diagram illustrating an example of a hot water supply apparatus to which the check valve according to the first embodiment is applied.
This hot water supply apparatus includes a hot water storage unit 10 that stores hot water and a heat pump unit 20 that generates hot water. The hot water storage unit 10 includes a hot water storage tank 11, and a water supply line 12 is connected to the lower portion of the hot water storage unit 10 to supply low-temperature water supplied from a water supply or the like. The lower part of the hot water storage tank 11 is connected to the inlet of the heat pump unit 20 via a circulation line 13a, and a circulation pump 14 is installed in the circulation line 13a. The outlet of the heat pump unit 20 is connected to the upper part of the hot water storage tank 11 via the circulation line 13b.

  The upper part of the hot water storage tank 11 is connected to one end of the hot water supply line 15, and the other end of the hot water supply line 15 is connected to the hot water supply side input of the mixing valve 17 through the check valve 16. The water supply side input of the mixing valve 17 is connected to the water supply line 12 via a check valve 18. The outlet of the mixing valve 17 is connected to a mixed water line 19, and this mixed water line 19 is connected to a kitchen faucet, a bathroom shower, and the like via a water amount sensor 19a. Here, the check valve according to the present invention is applied to the check valve 16 interposed in the hot water supply line 15 or the check valve 18 interposed in the water supply line 12.

  In this hot water supply apparatus, in the operating state, the circulating pump 14 sends low temperature water at the lower part of the hot water storage unit 10 to the heat pump unit 20, and hot water that has been heated by the heat pump unit 20 and heated to the upper part of the hot water storage unit 10. I try to return it. Thereby, the low temperature water supplied from the water supply line 12 is stored in the lower part of the hot water storage unit 10, and the hot water boiled by the heat pump unit 20 is stored in the upper part.

  Hot water stored in the upper part of the hot water storage unit 10 is supplied to the mixing valve 17 via the check valve 16 by the hot water supply line 15, while low temperature water supplied by the water supply line 12 is supplied via the check valve 18. It is supplied to the mixing valve 17. In the mixing valve 17, hot water and water are mixed at a predetermined ratio so as to reach a temperature set by a control unit (not shown) and sent to the mixed water line 19.

  Here, the check valve 18 is for preventing the heat of hot water supplied to the mixing valve 17 via the check valve 16 from propagating to the water supply line 12. As a result, the water in the water supply line 12 that the mixing valve 17 first mixes with hot water during hot water supply is insulated by the check valve 18 and does not become hot, so that the hot water that comes out first from the faucet or the like is burned. It can prevent becoming high temperature. Further, the check valve 18 on the side of the water supply line 12 expands when the water accumulated in the sealed space between the water supply line 17 is heated by the hot water from the hot water supply line 15 and increases in volume due to freezing. When the pressure on the secondary side rises abnormally, it has a pressure relief valve that releases the pressure to the primary side. Next, a specific configuration will be described taking the check valve 18 installed on the water supply line 12 side as an example.

  2 is a central longitudinal sectional view showing a closed state of the check valve according to the first embodiment, and FIG. 3 is a center showing a shaft portion and a check valve body of the check valve according to the first embodiment. FIG. 4 is a longitudinal cross-sectional view, and FIG. 4 is a cross-sectional view taken along the line AA of FIG.

  As shown in FIG. 2, the check valve 18 according to the first embodiment includes a cylindrical case 30 having openings at both ends, and the lower opening in FIG. 2 is connected to the water supply line 12. 2 is the secondary side connected to the water supply side input of the mixing valve 17. The case 30 is integrally formed with an annular check valve seat 31 that protrudes toward the secondary opening on the inner side of the primary side.

  A bearing portion 32 is disposed at the center of the case 30 in the opening on the secondary side of the case 30. The bearing portion 32 is coupled to the annular portion 34 via, for example, an arm portion 33 extending in three directions, and is integrally formed with a plurality of hooks 35 provided around the annular portion 34. The case 30 is provided with a plurality of fitting holes 36, and the hooks 35 are fitted into the fitting holes 36 so that the bearing portion 32 is coaxially disposed on the axis of the case 30. 30 is fixed.

  The bearing portion 32 supports a check valve body 37 having an outer diameter larger than that of the check valve seat 31 so that the check valve body 37 can advance and retract in the opening and closing direction. For this purpose, the check valve body 37 has a disk shape as shown in FIG. 4, and, as shown in FIG. 3, the first shaft portion extending in the secondary direction from the center of the disk shape. 38 and a second shaft 39 extending in the primary direction. The first shaft portion 38 is formed to have a larger diameter than the second shaft portion 39, and the first shaft portion 38 on the larger diameter side is pivotally supported by the bearing portion 32.

  In the check valve body 37, a pressure relief valve valve hole 40 is formed in a direction parallel to the axis of the first shaft portion 38 in the vicinity of the outer periphery of the first shaft portion 38. In the illustrated example, two valve holes 40 are arranged symmetrically about the axis of the first shaft portion 38.

  The check valve body 37 further has a pressure relief passage groove 41 formed on the outer peripheral surface of the second shaft portion 39 in a direction parallel to the axis. The pressure relief passage groove 41 is preferably formed on a line connecting the axis of the second shaft portion 39 and the center of the valve hole 40. That is, the pressure relief passage groove 41 is formed at a position on the circumference of the second shaft portion 39 that is the shortest from the valve hole 40.

  The second shaft portion 39 is also provided with a circumferential groove 43 for fitting the retaining ring 42 in the vicinity of the tip thereof. For the retaining ring 42, for example, a general-purpose part such as an E-type retaining ring can be used.

  The check valve body 37 is urged in the direction away from the bearing portion 32, that is, in the direction of the check valve seat 31, with the spring 44 disposed between the check valve body 37 and the arm portion 33. The spring 44 is formed with a small spring load so that the check valve can be opened even when the pressure difference between the primary side and the secondary side is small.

  On the primary side of the check valve body 37, a flexible packing 45 having low thermal conductivity is disposed. This packing 45 has substantially the same outer diameter as the check valve body 37, and has a double annular seal structure having an outer annular portion 45a, an inner annular portion 45b, and an intermediate coupling portion 45c for coupling them. Yes. The outer annular portion 45a is formed thicker than the inner annular portion 45b, and the intermediate coupling portion 45c is formed thinner than the outer annular portion 45a. The outer annular portion 45 a is a portion that is seated or separated from the check valve seat 31 and functions as a seal member of the check valve 18. On the other hand, the inner annular portion 45b of the packing 45 opens and closes the valve hole 40 formed in the check valve body 37, and functions as a seal member for the pressure relief valve. Therefore, on the primary side surface of the check valve body 37 with which the inner annular portion 45b of the packing 45 is in contact, the periphery of the valve hole 40 becomes a seal valve seat of the pressure relief valve.

  The packing 45 is provided with a spring guide 46 adjacent to the primary side of the inner annular portion 45 b, and a retaining ring 42 fitted in the spring guide 46 and a circumferential groove 43 near the tip of the second shaft portion 39. A spring 47 is arranged between the two. The spring 47 closes the valve hole 40 by urging the inner annular portion 45 b of the packing 45 toward the check valve body 37 via the spring guide 46. This spring 47 is also used with a large spring load, and only when the pressure on the secondary side received by the inner annular portion 45b of the packing 45 via the valve hole 40 becomes abnormally high, a check is made. The inner annular portion 45b is separated from the valve body 37, and the pressure relief valve is opened. The spring 47 not only constitutes a pressure relief valve but also has a function of holding the packing 45 on the check valve body 37.

  In addition, about the valve hole 40, although the two valve holes 40 were provided in the non-return valve body 37 in the example of illustration, the number is not limited to two, What is necessary is just at least one. When a plurality of valve holes 40 are provided, the valve holes 40 are provided in the annular region of the check valve body 37 with which the inner annular portion 45b of the packing 45 abuts. The valve hole 40 is preferably made as small as possible because the spring 47 that opposes the high pressure can be made small by forming the pressure receiving diameter small. However, if the pressure receiving diameter is too small, the valve hole 40 may be blocked by dust. Therefore, in the present embodiment, the pressure receiving diameter of the valve hole 40 is set to a minimum value that is less likely to be clogged by dust empirically, and the number of valve holes 40 having such a pressure receiving diameter is the number of springs. The number is set to 2 according to the spring load of 47.

  According to the above configuration, the seal 45 as the seal member of the check valve 18 is also used as the seal of the pressure relief valve, so that a dedicated seal member for the pressure relief valve becomes unnecessary, and the pressure relief valve component The score can be reduced. Further, the seal valve seat of the pressure relief valve is formed on the check valve body 37 outside the first shaft portion 38 and the second shaft portion 39, and the spring 47 of the pressure relief valve is formed on the second shaft portion 39. It was arranged outside. As a result, there is no small part that can be inserted into the first shaft part 38 and the second shaft part 39 as a part of the pressure relief valve, so that the assembling workability is greatly improved. Can be reduced.

Next, the operation of the check valve 18 configured as described above will be described.
FIG. 5 is a central longitudinal sectional view showing a check valve according to the first embodiment, and FIG. 6 shows a pressure relief valve provided in the check valve according to the first embodiment. It is a center longitudinal cross-sectional view.

  First, when there is no or very small pressure difference between the primary side pressure and the secondary side pressure of the check valve 18, as shown in FIG. The outer annular portion 45 a of the packing 45 is seated on the check valve seat 31. As a result, the check valve 18 is closed. The packing 45 is in close contact with the check valve body 37 by the urging force of the spring 47 with respect to the inner annular portion 45 b, but the outer annular portion 45 a is reversed in a state of being separated from the check valve body 37. The valve seat 31 is seated. At this time, the check valve 18 has a primary side space and a secondary side space separated from each other by a packing 45 having a low thermal conductivity, so that water in the secondary side space is supplied from the hot water supply line 15. Even if the temperature becomes high due to heat propagation, the water in the primary space does not become high temperature.

  Next, when the pressure on the secondary side of the check valve 18 becomes lower than the pressure on the primary side due to the opening of the faucet of the mixed water line 19, as shown in FIG. Receives the water pressure on the primary side and moves to the secondary side, and the check valve 18 opens. Thereby, as shown by the arrow B in the figure, the water supplied from the water supply line 12 flows in from the primary side of the check valve 18 and flows out through the inside of the case 30 to the secondary side.

  When the pressure on the secondary side is higher than the pressure on the primary side, the check valve 18 closes as shown in FIG. 2, but when the pressure on the secondary side becomes higher, the check valve body 37 further moves toward the primary side and comes into contact with the outer annular portion 45a of the packing 45 that has been separated so far. Further, when the pressure on the secondary side is increased, the outer annular portion 45a of the packing 45 is further pushed into the check valve seat 31 so that the check valve body 37 and the check valve seat 31 It is firmly fixed.

  From this state, when the pressure on the secondary side is further increased and the pressure difference from the pressure on the primary side exceeds a predetermined value, this time, as shown in FIG. The inner annular portion 45 b of the packing 45 receiving pressure is separated from the check valve body 37 against the biasing force of the spring 47. As a result, the pressure on the secondary side is reduced by flowing to the primary side through the valve hole 40, the clearance between the check valve body 37 and the inner annular portion 45b, and the pressure relief passage groove 41. Thus, even if the pressure on the secondary side of the check valve 18 becomes abnormally high, the pressure relief valve releases the pressure on the secondary side to the primary side, so that the components of the check valve 18 become high pressure. It will be avoided that it breaks.

FIG. 7 is a plan view showing packing of the check valve according to the second embodiment.
In the check valve 18 according to the first embodiment, the pressure passing through the pressure relief valve is released to the primary side via the pressure relief passage groove 41 formed in the second shaft portion 39. However, in the second embodiment, the pressure relief passage 48 is formed in the packing 45. That is, the packing 45 forms the pressure relief passage 48 by making the inner peripheral surface of the inner annular portion 45b uneven. In this embodiment, the pressure relief passage groove 41 is not necessarily required on the outer surface of the second shaft portion 39 through which the packing 45 is inserted.

  FIG. 8 is a view showing the check valve body and packing of the check valve according to the third embodiment, and (A) is a view of the check valve body as viewed from the second shaft portion side. B) is a view of the packing as viewed from the check valve body side.

  In the check valve 18 according to the third embodiment, as shown in FIG. 8A, there are two valves on the surface of the check valve body 37 on the second shaft portion 39 side. Two positioning convex portions 49 are formed on a line passing through the center of the second shaft portion 39 perpendicular to the line connecting the centers of the holes 40. On the other hand, as shown in FIG. 8B, the packing 45 is formed with two pressure relief passages 48 at positions opposed to the inner peripheral surface of the inner annular portion 45b. In addition, two positioning recesses 50 are formed on both sides of the inner annular portion 45 b on a line passing through the center of the packing 45 perpendicular to the line connecting the centers of the two pressure relief passages 48. The positioning recess 50 may be provided only on one side of the inner annular portion 45b. However, by providing the positioning recess 50 on both sides, the packing 45 can be assembled to the second shaft portion 39 regardless of the front and back, and the positioning recess 50 that is not used for positioning can be used for positioning. Can be a landmark.

DESCRIPTION OF SYMBOLS 10 Hot water storage unit 11 Hot water storage tank 12 Water supply line 13a, 13b Circulation line 14 Circulation pump 15 Hot water supply line 16 Check valve 17 Mixing valve 18 Check valve 19 Mixed water line 19a Water quantity sensor 20 Heat pump unit 30 Case 31 Check valve seat 32 Bearing Part 33 Arm part 34 Annular part 35 Hook 36 Fitting hole 37 Check valve body 38 First shaft part 39 Second shaft part 40 Valve hole 41 Pressure relief passage groove 42 Retaining ring 43 Circumferential groove 44 Spring 45 Packing 45a Outer annular portion 45b Inner annular portion 45c Intermediate coupling portion 46 Spring guide 47 Spring 48 Pressure relief passage 49 Positioning convex portion 50 Positioning concave portion

Claims (7)

A cylindrical case having a check valve seat on the inner primary side;
A bearing portion coaxially disposed on the axis of the case on the secondary side of the case;
A check valve body supported by the bearing portion so as to be movable in a direction to be seated or separated from the check valve seat;
A packing disposed on the check valve seat side of the check valve body;
A first spring that biases the check valve body in a direction in which the packing is seated on the check valve seat;
A valve hole formed in the check valve body and opened and closed by the packing;
A second spring that biases the packing in a direction to close the valve hole;
A check valve characterized by comprising:   The check valve body has a disk shape, and extends from the center of the disk shape in the direction of the secondary side and extends in the direction of the first shaft portion and the primary side supported by the bearing portion, and the packing. 2. The check valve according to claim 1, wherein the check valve is formed integrally with a second shaft portion that supports the valve, and the valve hole is formed in the vicinity of the outer periphery of the first shaft portion.   In the packing, an outer annular portion that is seated or separated from the check valve seat and an inner annular portion that opens and closes the valve hole are integrally formed, and the inner annular portion is formed on the second shaft portion. The check valve according to claim 2, wherein the check valve body is held by being biased in a direction of closing the valve hole by the second spring disposed on the outer periphery.   The check valve according to claim 3, wherein the inner annular portion is formed thicker than the outer annular portion.   The check valve according to claim 3, wherein at least one of the valve holes is provided in an annular region of the check valve body with which the inner annular portion of the packing abuts.   The second shaft portion is characterized in that a pressure relief passage groove is formed in a direction parallel to the axis of the second shaft portion at a position on the circumference that is the shortest from the valve hole. 2. The check valve according to 2.   The check valve according to claim 2, wherein the packing has a pressure relief passage formed in an inner peripheral surface of the inner annular portion.

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