JP2007016891A - Air vent valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air vent valve with a simple structure and superior durability, superior in operation certainty of automatically carrying out air venting without malfunction such as biting of foreign matter. <P>SOLUTION: The air vent valve 1B has a casing 30, a float chamber 1 formed in the casing 30, a valve seat provided in an upper end side of the float chamber 31, and a float valve element 33 housed in the float chamber 31 and capable of approaching and separating away from the valve seat 32. A plurality of coupling members 34 is provided for coupling the casing 30 and the float valve element 33, and it is composed to allow movement of the float valve element 33 in a vertical direction with respect to the casing 30, and to regulate movement in a horizontal direction. Instead of the coupling members 34, it is also favorable to form three or more vertical guide ribs guiding the float valve element 33 on an inner wall surface of the float chamber, or it is also favorable to form three or more vertical guide ribs protruding from an outer circumferential face of the float valve element. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air vent valve for extracting air from a piping system through which a liquid flows, such as a piping system such as a hot water heating system, and the like, and relates to a structure that is downsized and simplified and has improved operational reliability.

  For example, although the piping system of a heating terminal of a hot water heating system is filled with heating water, air that has entered from the outside and air dissolved in water tend to accumulate gradually. It is necessary to vent the air automatically. If this air venting is insufficient, the hot water circulation pump locks and does not operate.

  The hot water heating system is equipped with an air separation tank in its piping system, and is equipped with an air vent valve that vents air from this air separation tank. After the hot water heating system is installed, the piping system is filled with heating water. Air bleeding is performed from the air bleeding valve. However, if air bleeding is incomplete, air will collect again in the piping system around several weeks after construction. The reason for this is that the air that has been hidden from the time of construction, the air that has been dissolved in the heating water, the air that enters through the minute gaps in the pipe joints, and the air that enters through the pipe walls of the synthetic resin pipes This is because of accumulation in the piping system.

  By the way, it is desirable to always discharge the air accumulated in the air separation tank from the air vent valve. However, if the air vent valve malfunctions due to foreign matter in the piping system, the heating water may leak from the air vent valve. Therefore, in the current hot water heating system, after the piping system is filled with the heating water at the time of construction, air is vented from the air vent valve, and then a cap is screwed onto the outlet of the air vent valve and sealed. After that, the manufacturer maintenance staff visits the site in a timely manner, removes the cap, bleeds air, and puts the cap on again.

  When the volume of the air separation tank is insufficient, the hot water circulation pump is locked and the hot water heating system breaks down, resulting in a complaint from the user. In order to deal with this complaint, manufacturers have to make a useless design to prevent the hot water circulation pump from being locked by increasing the volume of the air separation tank.

  12 and 13 show a conventional general air vent valve 100. The air vent valve 100 includes a main body casing 101, a float chamber 102 therein, and a tank connected to an air separation tank (not shown). The connection port 103, the float 104 accommodated in the float chamber 102 so as to be movable up and down, the lateral casing portion 101a at the upper portion of the main body casing 101, the packing member 105 mounted in the distal end portion of the lateral casing portion 101a, and formed in the packing member 105 And a valve member 109 having a valve body 108 capable of opening and closing the valve seat 107, a spring member 110 for urging the valve rod 109 toward the valve closing side, and the like. ing.

  The base end portion of the valve rod 109 is inserted into the support hole 111 in the force point portion at the upper end of the float 104 in a loosely fitting manner. When the amount of air in the float chamber 102 increases and the liquid level in the float chamber 102 decreases, the float level becomes lower. The buoyancy acting on 104 decreases, the float 104 descends, the base end of the valve rod 109 descends, the valve body 108 tilts as shown in FIG. 12, and the air vent valve opens. FIG. 13 shows a state where the liquid level in the float chamber 102 is raised and the valve is closed.

  The gap A between the float 104 and the inner peripheral surface of the float chamber 102 is very small, and the gap B between the outer peripheral surface of the valve body portion 108 and the lateral casing portion 101a is also set to be small. Foreign matter (fine metal powder, dry fixed matter of water-soluble components, corrosive powder, wear powder, etc.) generated therein causes the float 104 and the valve body portion 108 to not work smoothly, and malfunctions are likely to occur. If the valve open state continues due to malfunction, it will cause water leakage, and if the valve close state continues due to malfunction, the pump will be locked. Therefore, after the hot water heating system is constructed, the air is vented, and as shown in FIG. 13, the cap 112 is attached and kept in a sealed state.

Patent Document 1 describes a liquid open / close valve equipped on a rising pipe of a sprinkler, and in this liquid open / close valve, a float valve body is supported by a plurality of float support members made of springs. .
In the column of the prior art in Patent Document 2, a ball type air vent valve in which a spherical float is accommodated in a float chamber in a casing is described. With this type of air vent valve, the valve is closed when the liquid level rises. However, since the air pressure of the air accumulated in the float chamber thereafter acts on the float, the float may not open. As a countermeasure, it is possible to increase the weight of the float. However, if the internal pressure is 0.42 MPa and the seal diameter at the valve seat is 5 mm, for example, in order to make the weight of the float larger than (internal pressure) × (seal cross-sectional area), the weight of the float should be about 820 gw or more. Therefore, it is necessary to provide a float with a large diameter, and it is not easy to make an air vent valve that can withstand practical use.

Patent Document 2 discloses an air vent valve that automatically vents air in place of the ball type air vent valve. In this air vent valve, when the liquid level rises, the valve seat at the end of the large-diameter opening is closed by the first float valve body and the second valve body above the valve body, and then When the liquid level is lowered, the second valve body holds the closed position, but atmospheric pressure is introduced from the pores formed in the second valve body, the second valve body is opened, and air is released again. Is automatically executed.
Japanese Patent Publication No.59-20072 Japanese Utility Model Publication No. 5-17279

  In the air vent valve shown in FIGS. 12 and 13, since the gaps A and B are small as described above, the float 104 and the valve body portion 108 do not operate smoothly due to foreign matter generated in the heating water, and malfunctions are caused. It's easy to do. As a countermeasure, it is conceivable to form a large gap A ′ between the casing 101 </ b> A and the float 104 as shown in FIG. 14. However, in such a structure, the amount of movement of the float 104 in the horizontal direction increases, so that the base end portion of the valve rod 109 separates from the support hole 111 of the float 104 and is likely to fail.

  In the air vent valve of Patent Document 2, since the gap between the upper and lower ends of the casing and the first valve body is small, the first float valve body is liable to malfunction due to the foreign matter generated in the liquid as described above. The structure of the air vent valve becomes complicated because it is necessary to additionally provide a second valve body, a guide cylinder for guiding the second valve body, a valve seat that comes into contact with the lower end of the second valve body, etc. There are problems such as becoming expensive.

  An object of the present invention is to provide an air bleed valve that has a simple structure and is less likely to malfunction due to foreign matter or the like, and to provide an air bleed valve that is excellent in operational certainty to automatically bleed air.

  The air vent valve according to claim 1 is a casing, a float chamber formed in the casing, a valve seat provided on the upper end side of the float chamber, and accommodated in and separated from the valve seat. An air bleeding valve having a float valve body, a plurality of connecting members for connecting the casing and the float valve body, wherein the float valve body is allowed to move in a vertical direction with respect to the casing and in a horizontal direction. A plurality of connecting members for restricting the movement of are provided. In this air vent valve, the casing, the float valve body, and the valve seat are arranged substantially concentrically.

  When the air vent valve is connected to a piping system through which liquid flows, when the liquid level in the float chamber rises, the float valve body rises and abuts against the valve seat provided on the upper end side of the float chamber to close the valve. become. When the air in the float increases and the liquid level drops, the buoyancy acting on the float valve body decreases, and when the buoyancy becomes smaller than the weight of the float valve body, the float valve body opens and air is released. Is made.

  A plurality of connecting members for connecting the casing and the float valve body are provided, and the plurality of connecting members allow the float valve body to move in the vertical direction with respect to the casing and restrict the movement in the horizontal direction. The valve body operates reliably so as to maintain the height position corresponding to the liquid level. Since a plurality of connecting members are provided, a sufficiently large gap can be ensured between the inner surface of the casing and the float valve body, so that a foreign object is caught in the gap between the inner surface of the casing and the float valve body. Can be structured so as not to malfunction.

  According to a second aspect of the present invention, there is provided the air vent valve according to the first aspect of the present invention. An annular gap is formed between the outer peripheral surface of the float valve body and the inner wall surface of the float chamber, and can prevent foreign matter from being caught.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the float valve body is formed so as to contact the valve seat in a state where the gas phase portion is left at the upper end portion of the float chamber. It is a feature.
According to a fourth aspect of the present invention, in the invention of the first or second aspect, the plurality of connecting members are arranged at equal intervals in the circumferential direction on the outer peripheral side of the float valve body. .

  According to a fifth aspect of the present invention, the air vent valve according to any one of the first to fourth aspects is detachably attached to the casing, and swings the float valve body with respect to the casing during transportation before the air vent valve is installed. A rocking restriction cap for restriction is provided.

  The air vent valve according to claim 6 is a casing, a float chamber formed in the casing, a valve seat provided on the upper end side of the float chamber, and accommodated in and separated from the valve seat. An air bleeding valve having a float valve body, and three or more longitudinal guide ribs formed on an inner wall portion of the float chamber, wherein the float valve body is allowed to move in a vertical direction with respect to the casing; Three or more vertical guide ribs for restricting movement in the horizontal direction are provided.

  This air vent valve operates in the same manner as the air vent valve of claim 1 to perform air venting. Three or more vertical guide ribs are formed on the inner wall portion of the float chamber, and the vertical guide ribs allow the float valve body to move in the vertical direction relative to the casing and restrict the movement in the horizontal direction. Only a small frictional force acts on the float valve body from the ribs, and foreign matters are not easily caught between the float valve and the longitudinal guide ribs, so that the operational reliability and durability are improved.

  The air vent valve according to claim 7 is a casing, a float chamber formed in the casing, a valve seat provided on the upper end side of the float chamber, and accommodated in and separated from the valve seat. An air bleeding valve having a float valve body, and three or more vertical guide ribs formed so as to protrude from the outer peripheral surface of the float valve body, wherein the float valve body moves in the vertical direction relative to the casing. And three or more vertical guide ribs for restricting the movement in the horizontal direction are provided.

  In this air vent valve, as in the air vent valve according to claim 6, instead of forming three or more vertical guide ribs on the inner wall portion of the float chamber, the air vent valve is formed so as to protrude from the outer peripheral surface of the float valve body. Since two or more vertical guide ribs are provided, the same effect as that of the air vent valve according to the sixth aspect is obtained.

  The air vent valve according to claim 8 is the air vent valve according to claim 6 or 7, wherein the float chamber and the float valve body are formed in a circular shape in a horizontal section, and three or more vertical guide ribs are arranged at equal intervals in the circumferential direction, The vertical guide ribs are formed in a thin plate shape.

  According to the air vent valve of claim 1, the casing, the float chamber in the casing, the valve seat provided on the upper end side of the float chamber, the float valve body housed in the float chamber and capable of contacting and separating from the valve seat; Therefore, the float chamber, the float valve body, and the valve seat can be arranged concentrically, and the structure of the air vent valve can be simplified.

  Moreover, in order to provide a plurality of connecting members for connecting the casing and the float valve body, and to allow the movement of the float valve body relative to the casing in the vertical direction and to restrict the movement in the horizontal direction by the plurality of connecting members, The float valve element operates reliably to maintain the height position corresponding to the liquid level. Since a sufficiently large gap can be secured between the inner surface of the casing and the float valve body, a structure in which foreign matter is caught in the gap between the inner surface of the casing and the float valve body and the float valve body does not malfunction. can do.

  The air vent valve according to claim 2, wherein the float valve body includes a valve body main body, and a valve body upper portion having a smaller diameter than the valve body main body and protruding upward from the upper end of the valve body main body by a predetermined length. An annular gap is formed between the outer peripheral surface of the valve body and the inner wall surface of the float chamber, so that foreign materials can be caught between the outer peripheral surface of the float valve body and the inner wall surface of the float chamber. Therefore, the operational reliability can be improved.

  The air vent valve according to claim 3 is formed so that the float valve body comes into contact with the valve seat in a state where the gas phase portion remains in the upper end portion of the float chamber, so that the liquid level in the float chamber reaches the valve seat. Since the valve is closed before operation, liquid leakage can be reliably prevented.

  In the air vent valve according to the fourth aspect, since the plurality of connecting members are arranged at equal intervals in the circumferential direction on the outer peripheral side of the float valve body, the float valve body can move smoothly in the vertical direction.

  The air vent valve according to claim 5 is detachably attached to the casing and is provided with a rocking restriction cap for restricting rocking of the float valve body with respect to the casing during transportation before installation of the air bleeding valve. The movement restricting cap restricts the swinging of the float valve body with respect to the casing during transportation of the air bleeding valve, and can reliably prevent the plurality of connecting members from dropping off.

  According to the air vent valve of claim 6, the casing, the float chamber in the casing, the valve seat provided on the upper end side of the float chamber, the float valve body housed in the float chamber and capable of contacting and separating from the valve seat; Therefore, the float chamber, the float valve body, and the valve seat can be arranged concentrically, and the structure of the air vent valve can be simplified.

  Three or more vertical guide ribs are formed on the inner wall portion of the float chamber, and the vertical guide ribs allow the float valve body to move in the vertical direction relative to the casing and restrict the movement in the horizontal direction. Only a small frictional force acts on the float valve body from the ribs, and foreign objects are not easily caught between the float valve body and the longitudinal guide ribs, so that an air vent valve with excellent operational reliability and durability can be realized. . The structure for allowing the float valve body to move in the vertical direction and restricting the movement in the horizontal direction can be simplified, and an air vent valve that can be manufactured at low cost with a simple structure can be realized.

  In the air vent valve according to claim 7, unlike the air vent valve according to claim 6, instead of forming three or more vertical guide ribs on the inner wall portion of the float chamber, the air vent valve is formed to protrude from the outer peripheral surface of the float valve body. Since the three or more vertical guide ribs are provided, the same effect as that of the air vent valve according to the sixth aspect is obtained.

  In the air vent valve according to claim 8, the float chamber and the float valve body are formed in a circular shape in a horizontal section, three or more vertical guide ribs are arranged at equal intervals in the circumferential direction, and each vertical guide rib is formed in a thin plate shape. Therefore, the frictional force acting on the float valve body via the vertical guide rib can be made very small, so that the operation reliability and reliability of the air bleeding valve can be improved.

  An air vent valve according to the present invention includes a casing, a float chamber formed in the casing, a valve seat provided on the upper end side of the float chamber, and accommodated in and separated from the valve seat. An air bleeding valve having a float valve body, a plurality of connecting members for connecting the casing and the float valve body, wherein the float valve body is allowed to move in a vertical direction with respect to the casing and in a horizontal direction. A plurality of connecting members for restricting the movement of are provided.

Examples of the present invention will be described below.
As shown in FIGS. 1 to 3, the air vent valve 1 of the present embodiment is connected to the top of an air separation tank (not shown) at the top of the piping system of the hot water heating system and draws air (air) from the piping system. It is for pulling out. The air vent valve 1 includes a casing 2, a float chamber 3 formed in the casing 2, a float valve body 4, a valve seat body 5 having a valve seat 5 a, a ring 6, and four connecting members 7. Etc.

  The casing 2 includes a synthetic resin or metal cylindrical lower casing 2A, a synthetic resin or metal upper casing 2B fixed to the upper end of the lower casing 2A with a plurality of bolts (not shown), and both casings 2A, 2B. It is composed of an O-ring 8 that seals the gap. The lower casing 2A has a lower casing main body 2a and a slightly small-diameter cylindrical portion 2b continuous downward from the lower end portion of the lower casing main body 2a. The small-diameter cylindrical portion 2b is connected to the top of the air separation tank by a screw coupling portion 9. Connected to.

  The upper casing 2B is formed by integrally forming a large diameter portion 2c having the same diameter as the lower casing 2A and a slightly small diameter upper end cylindrical portion 2d extending upward from the large diameter portion 2c. A float chamber 3 is formed inside the lower casing body 2a and the large diameter portion 2c. The float chamber 3 communicates with a small-diameter channel hole 10 formed in the small-diameter cylindrical portion 2b and communicated with the air separation tank. A float valve body 4 made of a synthetic resin hollow body is accommodated in the float chamber 3 so as to be movable up and down. The float chamber 3 and the float valve body 4 are formed in a circular shape in the horizontal section.

  The upper casing 2B is formed with a passage hole 11, a valve seat mounting hole 12 connected to the passage hole 11, and a screw hole 13 connected to the valve seat mounting hole 12. The valve seat mounting hole 12 has a metal A valve seat body 5 made of metal is mounted so as to be positioned on the upper end side of the float chamber 3, and this valve seat body 5 is pressed and fixed from above by a ring 6 screwed into the screw hole 13. A valve hole 5 b is formed at the center of the valve seat body 5, and an annular valve seat 5 a is formed around the valve hole 5 b at the lower end of the valve seat body 5.

The float valve body 4 has a valve body main body 4a and a valve body upper portion 4b having a smaller diameter than the valve body main body 4a and protruding upward by a predetermined length from the upper end of the valve body main body 4a. The upper end surface of the valve body 4a is formed in a partial cone shape that becomes lower toward the outer peripheral side. The upper end of the valve body upper part 4b is formed in a flat shape, and the upper end part of the valve body upper part 4b is in contact with the valve seat 5a and can be closed between the float valve body 4 and the valve seat 5a or synthetic resin or synthetic resin A valve face portion 14 made of a resilient member such as rubber is formed.
As shown in FIG. 2, when the water level in the float chamber 3 rises, the float valve body 4 moves upward, leaving the gas phase portion at the upper end portion of the float chamber 3. As shown in FIG. 1, when the surface portion 14 comes into contact with the valve seat 5a and the water level in the float chamber 3 falls, the float valve body 4 moves downward to open the valve.

  Between the valve body 4a of the float valve body 4 and the inner wall surface of the float chamber 3, an annular gap 15 (for example, a width of about 3 to 6 mm) capable of preventing foreign matter from being caught is formed. A circular concave portion 16 having an open lower end is formed at the lower end portion of the valve body 4a of the float valve body 4, and a metal adjustment weight 17 for adjusting the weight of the float valve body 4 is attached to the circular concave portion 16. Is done. The float chamber 3, the float valve body 4, the valve seat body 5 and the valve seat 5a are arranged concentrically.

  In order to allow the float valve body 4 to move in the vertical direction with respect to the casing 2 and to restrict the movement in the horizontal direction, four connecting members 7 that connect the casing 2 and the float valve body 4 include the float valve body 4. Are arranged at equal intervals in the circumferential direction on the outer peripheral side of the. Each of these four connecting members 7 is constituted by a thin bendable chain member made of stainless steel in this embodiment.

  Therefore, four rib pieces 18 at equal intervals in the circumferential direction are integrally formed in the upper end portion of the valve body 4a of the float valve body 4 in the vertical direction, and on the upper end portion of the inner wall surface of the float chamber 3 The cylindrical body 19 made of stainless steel is fitted and fixed, and at the lower part of the cylindrical body 19, four groove portions 19a are formed at equal intervals in the circumferential direction, and the four rib pieces 18 are opposed to the four groove portions 19a. The phase position around the axis of the float valve body 4 is set.

  The outer peripheral end of each connecting member 7 is connected to a pin provided in the groove 19 a, and the inner peripheral end of the connecting member 7 is connected to the connecting hole of the rib piece 18. When the valve is closed as shown in FIG. 2, the connecting member 7 maintains a slightly loose state. As shown in FIG. 1, even when the float valve body 4 is at the lower limit position and the float valve body 4 is received by the receiving portion 20 of the casing 2, the connecting member 7 maintains a slightly loose state.

The operation and effect of the air vent valve 1 described above will be described.
In a state where the air vent valve 1 is connected to the air separation tank at the top of the piping system of the hot water heating system, when the water level of the float chamber 3 rises, the float valve body 4 rises and is provided on the upper end side of the float chamber 3. The valve seat 5a is brought into contact with the valve seat 5a to be closed. When the air in the float chamber 3 increases and the water level falls, the buoyancy acting on the float valve body 4 decreases, and when the buoyancy becomes smaller than the weight of the float valve body 4, the float valve body 4 moves downward. The valve is moved and separated from the valve seat 5a to be in an open state, and the air is released. Thus, the air is always automatically released.

  Four connecting members 7 for connecting the casing 2 and the float valve body 4 are provided, and the four connecting members 7 allow the float valve body 4 to move in the vertical direction with respect to the casing 2 and move in the horizontal direction. In order to regulate, the float valve body 4 operates reliably so as to maintain a height position corresponding to the water level. Since the four connecting members 7 are provided, a sufficiently large gap (annular gap 15) can be secured between the inner surface of the casing 2 and the float valve body 4, so that the inner surface of the casing 2 and the float valve body 4 can be secured. A structure in which foreign matter is not caught in the gap and the float valve body 4 does not malfunction can be obtained.

  Because it has the casing 2, the float chamber 3 in the casing 2, the valve seat 5 a provided on the upper end side of the float chamber 3, and the float valve body 4 that is accommodated in the float chamber 3 and can be contacted and separated from the valve seat 5 a The float chamber 3, the float valve body 4, and the valve seat 5a can be arranged concentrically, and the structure of the air vent valve 1 can be simplified.

  The float valve body 4 includes a valve body main body 4a and a valve body upper portion 4b having a smaller diameter than the valve body main body 4a and protruding upward from the upper end of the valve body main body 4a by a predetermined length. Since an annular gap 15 is formed between the surface and the inner wall surface of the float chamber 3 to prevent the foreign material from being caught, the foreign material is caught between the outer peripheral surface of the float valve element 4 and the inner wall surface of the float chamber 3. It is possible to improve operation reliability and reliability.

  Since the float valve body 4 is formed so as to contact the valve seat 5a with the gas phase portion remaining in the upper end portion of the float chamber 3, the valve closing operation is performed before the water surface in the float chamber 3 reaches the valve seat 5a. Therefore, the leakage of the heating water can be surely prevented. Since the four connecting members 7 are arranged on the outer peripheral side of the float valve body 4 at equal intervals in the circumferential direction, the float valve body 4 can move smoothly in the vertical direction.

Next, an example of the specifications of the air bleeding valve 1 will be described.
The diameter of the valve hole 5b is set to 1.2 mm so that foreign matter is not clogged in the valve hole 5b and air can be surely removed from the valve hole 5b. If the shutoff pressure of the circulation pump of the piping system of the hot water heating system is 0.35 MPa and the installation head is 0.07 MPa at the maximum, the maximum value of the water pressure and the air pressure in the float chamber 3 is 0.42 MPa. If the radius R of the protruding portion of the valve seat 5a is 0.1 mm in order to ensure the durability of the valve face portion 14, the diameter of the valve hole 5b is 1.2 mm. Therefore, the seal diameter D at the portion of the valve seat 5a is = (1.2 mm + 0.2 mm) = 1.4 mm.

  Therefore, in order for the float valve body 4 to open in response to the accumulation of air in the float chamber 3, the weight of the float valve body 4 needs about 65 gw. Since the float valve body 4 needs to float by buoyancy, the float valve body 4 needs to have a hollow volume of 65 cc or more, and the bulk specific gravity of the float valve body 4 is the liquid flowing into the float chamber 3 (in this embodiment, It is necessary to set it below the specific gravity of the heating water).

  The connecting member 7 of the air vent valve 1 may be constituted by any one of a spring, a flexible synthetic resin string member, a wire link member and the like instead of the chain member. Further, the number of the connecting members 7 is not limited to four, and may be three or five or more, but it is desirable to arrange them at regular intervals in the circumferential direction. Further, the casing 2 of the air vent valve 1 is merely an example, and the structure of the casing 2 can be changed as appropriate. The air vent valve 1 is applicable as an air vent valve for various uses other than the hot water heating system.

The air bleeding valve according to this embodiment will be described with reference to FIGS.
This air vent valve 1A is for venting air from the air separation tank of the hot water heating system, like the air vent valve 1 of the first embodiment, and basically has the same configuration as the air vent valve 1. Therefore, a configuration similar to that of the air vent valve 1 will be briefly described, and a different configuration will be described in detail.

  The air vent valve 1 </ b> A includes a metal casing 30, a float chamber 31 formed in the casing 30, a valve seat 32 provided on the upper end side of the float chamber 31, and a valve seat 32 housed in the float chamber 31. A float valve body 33 that can be brought into contact with and separated from, and four connecting members 34, a rocking restriction cap 35, and the like. The casing 30 includes a casing body 30A having a circular horizontal cross section and a lid casing 30B that closes an upper end portion of the casing body 30A. The lid casing 30B is fixed to the flange portion 30a of the casing body 30A by a plurality of screws 30b. ing.

  A connecting cylinder 36 is formed at the center of the lower end of the casing body 30A, and the casing 30 is connected to the air separation tank by the connecting cylinder 36. The float chamber 31 in the casing 30 communicates with the air separation tank through a flow path hole 37 in the connecting cylinder portion 36. A circular recess 38 is formed at the center of the lower surface of the lid casing 30B. An annular valve seat 32 protruding downward is formed at the center of the circular recess 38, and the valve communicates with the center of the valve seat 32. A hole 39 is formed in the lid casing 30B. The diameter of the valve hole 39 is about 1.0 to 2.0 mm, but is not limited to this value.

  The synthetic resin float valve element 33 includes a valve element body 33a and a valve element upper part 33b having a smaller diameter than the valve element body 33a and protruding upward from the upper end of the valve element body 33a by a predetermined length. The main body 33a has a valve body main body divided body 33c that is internally fitted and screwed to form the hollow portion 40 therein. Between the outer peripheral surface of the valve body 33 a and the inner wall surface 31 a of the float chamber 31, an annular gap 41 that can prevent foreign matter from being caught is formed. A valve face portion 42 made of an elastic synthetic resin material is provided at the center of the upper end portion of the valve body upper portion 33b.

  The four connecting members 34 that connect the casing 30 and the float valve element 33 allow the float valve element 33 to move in the vertical direction relative to the casing 30 and restrict the movement in the horizontal direction. The four connecting members 34 are arranged at equal intervals in the circumferential direction. Each connecting member 34 is formed of a spring made of a stainless steel wire having a small diameter and is arranged in a free length state. The upper end portion of each connecting member 34 is connected to a bracket 43 protruding from the lower surface of the lid casing 30B, and the lower end portion of each connecting member 34 is a bracket 44 formed to protrude from the valve body main body 33a and the valve body upper portion 33b. It is connected to.

  Since the float valve body 33 may swing during transportation before the air vent valve 1A is installed, as shown in FIG. A rocking restriction cap 35 is provided. A circular recess 45 is formed in the lower surface side central portion of the bottom wall of the valve body main body divided body 33 c of the float valve body 33. On the other hand, the rocking restriction cap 35 is formed so as to be fitted and held in the connecting cylinder part 36 of the casing 30, and the rocking restriction cap 35 is fitted in the connecting cylinder part 36 in the upper half of the rocking restriction cap 35. In the held state, a regulating shaft portion 35a that fits into the circular recess 45 is integrally formed.

Next, the operation and effect of the air vent valve 1A will be described.
When the water surface in the float chamber 31 rises, the float valve body 33 rises and the valve surface portion 42 comes into contact with the valve seat 32, the valve is closed. However, at this time, since the valve portion is closed with the gas phase portion remaining in the upper end portion of the float chamber 31, the heating water does not leak from the valve hole 39. On the other hand, when air accumulates in the air separation tank and the water surface of the float chamber 31 is lowered, the buoyancy acting on the float valve body 33 is reduced, the float valve body 33 is lowered by its own weight, and the valve surface portion 42 is separated from the valve seat 32. The valve is opened and the air is automatically vented. In addition, the same operation and effect as the air vent valve 1 are exhibited.

  In addition, when the air vent valve 1A is transported before installation, as shown in FIG. 5, when the swing regulating cap 35 is attached, the swing of the lower end portion of the float valve element 33 in the horizontal direction is restricted. Therefore, the float valve element 33 can be reliably regulated so as not to swing.

Next, the air vent valve 1B according to the present embodiment will be described with reference to FIGS.
In the air vent valve 1B, the same members as those in the air vent valve 1 are denoted by the same reference numerals, description thereof is omitted, and different configurations will be described.
In this air vent valve 1B, the connecting member 7 of the air vent valve 1 and the related members are omitted, and instead, three vertical guide ribs 50 are integrally formed on the inner wall portion of the float chamber 3 to float. It extends to the vicinity of the outer peripheral surface of the valve body 4, and the vertical guide ribs 50 are configured to allow the float valve body 4 to move in the vertical direction relative to the casing 2 and restrict the movement in the horizontal direction.

  The three vertical guide ribs 50 are arranged at three equal circumferential positions, and the vertical guide ribs 50 are formed in a thin plate shape and are formed integrally with the lower casing 2 </ b> A of the casing 2. The inner end portion 50a of the vertical guide rib 50 is formed in a partial cylindrical surface shape having a convex convexity on the float valve body 4 side in order to minimize the contact frictional force with the float valve body 4. A minute gap (for example, 0.4 to 0.8 mm) is formed between the inner end portion 50 a of the vertical guide rib 50 and the outer peripheral surface of the float valve body 4. This is to reduce the contact friction force exerted on the float valve body 4 as much as possible, and to prevent biting of foreign matter.

  Since the air bleeding operation of the air bleeding valve 1B is the same as that of the air bleeding valve 1, the description thereof is omitted. When the float valve body 4 moves up and down as the water level in the float chamber 31 rises and falls, the float valve body 4 is allowed to move in the vertical direction and move in the horizontal direction by three vertical guide ribs 50. Guided to regulate. The vertical guide rib 50 is formed in a thin plate shape, and the inner end portion 50a thereof is formed in a partial cylindrical surface shape. Also, a minute gap is formed between the inner end portion 50a and the outer peripheral surface of the float valve body 4. Since the contact friction force hardly acts on the float valve body 4 from the three vertical guide ribs 50, and even if the contact friction force acts on the float valve body 4, it is very small force. There is no adverse effect on the lifting operation. In addition, since there is no possibility that foreign matter may be caught between the vertical guide ribs 50 and the inner peripheral surface of the float chamber 3, the operation reliability and durability are excellent. In this air vent valve 1B, the structure of the air vent valve is greatly simplified because the three vertical guide ribs 50 permit the vertical movement of the float valve body 4 and restrict the horizontal movement. Can do.

  In the air vent valve 1B of the second embodiment, the three vertical guide ribs 50 as described above can be employed instead of the connecting member 34. Further, the number of the longitudinal guide ribs 50 is not limited to 3, and may be 4 or 5 or more. Further, the example in which the longitudinal guide rib 50 is integrally formed with the casing 2 has been described. However, a cylindrical body that is formed separately from the casing 2 and is fitted in the inner wall portion of the float chamber, and 3 that is integrally formed with the cylindrical body. You may comprise with two or more vertical guide ribs. The air vent valve 1B is also applicable to various uses other than the hot water heating system.

Next, the air vent valve 1C according to the present embodiment will be described with reference to FIGS.
In the air vent valve 1C, the same components as those of the air vent valve 1 are denoted by the same reference numerals, description thereof is omitted, and different configurations will be described.
In this air vent valve 1C, the connecting member 7 of the air vent valve 1 and the related members are omitted, and instead, three vertical guide ribs 60 are integrally formed so as to protrude from the outer peripheral surface of the float valve body 4. It is formed and extends to the vicinity of the inner peripheral surface of the float chamber 3, and the vertical guide rib 60 allows the float valve element 4 to move in the vertical direction relative to the casing 2 and restricts the movement in the horizontal direction. ing.

  The three vertical guide ribs 60 are disposed at a position equally divided into three circumferences, and the vertical guide ribs 60 are formed in a thin plate shape and are formed integrally with the float valve body 4. The outer end portion 60a of the vertical guide rib 60 is formed in a partial cylindrical surface shape having a convex casing 2 side in order to minimize the contact frictional force with the casing 2. A minute gap (for example, 0.4 to 0.8 mm) is formed between the outer end portion 60 a of the vertical guide rib 60 and the inner peripheral surface of the float chamber 3 of the casing 2. This is to reduce the contact friction force exerted on the float valve body 4 as much as possible, and to prevent biting of foreign matter.

  Since the air bleeding operation of the air bleeding valve 1C is the same as that of the air bleeding valve 1, the description thereof is omitted. When the float valve body 4 moves up and down as the water level in the float chamber 31 rises and falls, the float valve body 4 is allowed to move in the vertical direction by the three vertical guide ribs 60 and move in the horizontal direction. Guided to regulate. The vertical guide rib 60 is formed in a thin plate shape, and its outer end portion 60a is formed in a partial cylindrical surface shape. In addition, a minute gap is formed between the outer end portion 60a and the inner peripheral surface of the casing 2. Therefore, almost no contact friction force acts on the three vertical guide ribs 60 from the casing 2, and even if the contact friction force acts, the force is very small. There is no adverse effect. In addition, since there is no possibility of foreign matter being caught between the vertical guide rib 60 and the inner peripheral surface of the float chamber 3, the operation reliability and durability are excellent.

  In this air vent valve 1C, the vertical valve rib 60 allows the vertical movement of the float valve body 4 and restricts the horizontal movement, so that the structure of the air vent valve is greatly simplified. Can do. In the air vent valve 1B of the second embodiment, the three vertical guide ribs 60 as described above can be employed instead of the connecting member 34. Further, the number of the longitudinal guide ribs 60 provided is not limited to three, and four or five or more may be provided. Further, although the example in which the vertical guide rib 60 is integrally formed with the float valve body 4 has been described, a cylinder body that is formed separately from the float valve body and is fitted on the float valve body is integrally formed with the cylinder body. You may comprise with three or more vertical guide ribs. The air vent valve 1C is also applicable to various uses other than the hot water heating system.

It is a longitudinal cross-sectional view of the air vent valve (valve open state) which concerns on Example 1 of this invention. It is a longitudinal cross-sectional view of the air bleeding valve (valve closed state) of FIG. It is the III-III sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the air bleeding valve (opening state) of Example 2. It is a longitudinal cross-sectional view of the air vent valve of FIG. It is a longitudinal cross-sectional view of the air vent valve (valve open state) of Example 3. It is a longitudinal cross-sectional view of the air vent valve (valve closed state) of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the air vent valve (valve open state) of Example 4. It is a longitudinal cross-sectional view of the air vent valve (valve closed state) of FIG. It is the XI-XI sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the air vent valve (valve open state) which concerns on a prior art. It is a longitudinal cross-sectional view of the air vent valve (valve closed state) of FIG. It is a longitudinal cross-sectional view of the virtual air vent valve which changed the air vent valve of FIG.

Explanation of symbols

1, 1A, 1B, 1C Air vent valve 2, 30 Casing 2A Lower casing 2B Upper casing 3, 31 Float chamber 4, 33 Float valve element 4a, 33a Valve element body 4b, 33b Valve element upper part 5a, 32 Valve seat 7, 34 connecting members 15 and 41 annular gaps 50 and 60 longitudinal guide ribs

Claims (8)

An air bleeding valve having a casing, a float chamber formed in the casing, a valve seat provided on the upper end side of the float chamber, and a float valve body housed in the float chamber and capable of contacting and separating from the valve seat Because
A plurality of connecting members for connecting the casing and the float valve body, wherein a plurality of connecting members for allowing the float valve body to move in the vertical direction relative to the casing and restricting the movement in the horizontal direction are provided. Air vent valve characterized by.   The float valve body has a valve body main body, and a valve body upper portion having a smaller diameter than the valve body main body and protruding upward from the upper end of the valve body main body by a predetermined length, and an outer peripheral surface of the float valve body and a float chamber The air vent valve according to claim 1, wherein an annular gap is formed between the inner wall surface and the inner wall surface to prevent foreign matter from being caught.   The air vent valve according to claim 1 or 2, wherein the float valve body is formed so as to contact the valve seat in a state in which a gas phase portion is left at an upper end portion of the float chamber.   The air bleeding valve according to claim 1 or 2, wherein the plurality of connecting members are arranged at equal intervals in the circumferential direction on the outer peripheral side of the float valve body.   5. A rocking restriction cap that is detachably attached to the casing and restricts rocking of the float valve body with respect to the casing during transportation before installation of the air bleeding valve. The air vent valve according to Crab. An air bleeding valve having a casing, a float chamber formed in the casing, a valve seat provided on the upper end side of the float chamber, and a float valve body housed in the float chamber and capable of contacting and separating from the valve seat Because
Three or more vertical guide ribs formed on the inner wall of the float chamber, the three or more vertical guide ribs allowing the float valve body to move in the vertical direction relative to the casing and restricting the movement in the horizontal direction. An air vent valve provided with a guide rib. An air bleeding valve having a casing, a float chamber formed in the casing, a valve seat provided on the upper end side of the float chamber, and a float valve body housed in the float chamber and capable of contacting and separating from the valve seat Because
3 or more vertical guide ribs formed so as to protrude from the outer peripheral surface of the float valve body, which allow the float valve body to move in the vertical direction relative to the casing and restrict the movement in the horizontal direction 3 An air vent valve comprising at least two vertical guide ribs.   7. The float chamber and the float valve body are formed in a circular shape in a horizontal section, three or more vertical guide ribs are arranged at equal intervals in the circumferential direction, and each vertical guide rib is configured in a thin plate shape. Or the air bleeding valve of 7.

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