JP4615195B2 - Float type steam trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam trap that is connected to steam-using equipment, steam piping, or the like and automatically discharges condensate.
[0002]
[Prior art]
A conventional float type steam trap is shown in FIGS. A float type steam trap 50 shown in FIG. 13 has a cylindrical inner valve 53 fixed to a lever 52 that is fixed at one end to a float 51 and rotatably supported at the other end. It is configured to move up and down following the up and down movement of the float 51.
[0003]
Further, a float type steam trap 60 shown in FIG. 14 has a spherical inner valve 63 fixed to the lower end of a lever 62 whose one end is fixed to a float 61 and the other end is rotatably supported. 63 opens and closes together with the rotation of the lever 62.
[0004]
In these float steam traps shown in FIGS. 13 and 14, the float buoyancy is F, the distance from the center of the float to the position of the lever rotation center is L1, and the position of the lever rotation center to the inner valve mounting position. The condition for opening the valve is expressed by the following equation, where L2 is the distance to the outlet, A is the cross-sectional area of the outlet, and ΔP is the condensate pressure difference between the inlet and outlet sides of the outlet.
F × L1> A × ΔP × L2 Expression (1)
[0005]
However, in order to open the valve in the conventional float type steam trap, F or L1 in Formula (1) may be increased or A or ΔP, L2 may be decreased. However, increasing F or L1 is a device. There was a problem that the whole was enlarged.
[0006]
Decreasing A leads to a decrease in discharge capacity, and decreasing L2 leads to a decrease in the condensate discharge capacity because the lift amount of the inner valve cannot be taken. Further, if ΔP is made smaller, the use conditions are limited, and there is a problem that versatility is lost.
[0007]
Further, the valve seat method for determining the valve closing performance of the conventional float type steam trap is a vertical contact surface contact method in the one shown in FIG. 13, and a line contact method by a spherical surface in the one shown in FIG. The closing performance and durability are not perfect, and there is a problem that steam leaks.
[0008]
Therefore, in order to solve these problems, conventionally, the float type steam trap having a large discharge capacity is large in size as a whole, and the usable ΔP is small. In addition, when the apparatus is downsized or when the usable ΔP is increased, the discharge capacity is reduced. For this reason, in order to satisfy a wide range of specifications, there has been a tendency that the number of models increases and the size of the apparatus increases.
[0009]
As described above, problems required for the float type steam trap include the following.
1) The conventional large-sized apparatus is reduced in size, the drainage capacity is increased, and the working pressure range is widened.
2) Improve closing performance and durability, eliminate unnecessary steam waste, and realize economical operation.
3) Prevent water hammer from occurring due to sudden closing of the inner valve.
4) In a device with a large condensate discharge capacity, continuous discharge is possible even when the amount of condensate inflow is small.
5) Prevent the float from breaking and breaking against disturbances such as sudden condensate inflow and vibration during equipment transport.
[0010]
In order to solve such a conventional problem, the present inventors have made a float steam provided with a valve body on the float so that the valve seat can be opened and closed by sliding with respect to the valve seat in conjunction with the vertical movement of the float. A trap has been developed (see Patent Document 1).
[0011]
[Patent Document 1]
JP 2002-195492 A
[0012]
[Problems to be solved by the invention]
The present invention provides a float-type steam trap that can further improve the closing performance in a float-type steam trap that reduces the size of the apparatus and increases drainage capacity, improves valve closing performance, and prevents water hammer. The purpose is to do.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a float steam trap according to the first aspect of the present invention has a float chamber, a main body having an inlet and an outlet that communicate with the float chamber, and an interior of the float chamber. A float that can be moved up and down, a valve seat that communicates with the outlet in the float chamber, and can slide to the valve seat in conjunction with the up and down movement of the float to open and close the valve seat A valve body provided in the float, When the valve body slides with respect to the valve seat to open and close the valve seat, the valve body is worn and the sealing degree is increased, so that the frictional resistance is further reduced. The valve seat is made of stainless steel or other metal, and the valve body is made of carbon having a lower degree of wear resistance and higher hardness than the valve seat.
[0014]
A float steam trap according to a second aspect of the present invention has a float chamber, a main body having an inlet and an outlet communicating with the float chamber, and a float provided in the float chamber so as to be vertically movable. A valve seat seal surface that communicates with the outlet and protrudes into the float chamber, and a cross-section of the outer peripheral edge of the valve seat seal surface is perpendicular to the valve seat. A valve body made of a material with a low degree of wear, provided on the float, and having a valve body seal surface capable of opening and closing the valve seat by sliding with respect to the valve seat seal surface in conjunction with the vertical movement of the float; Have When the valve body slides with respect to the valve seat to open and close the valve seat, the valve body is worn and the sealing degree is increased, so that the frictional resistance is further reduced. The valve seat is made of stainless steel or other metal, and the valve body is made of carbon having a lower degree of wear resistance and higher hardness than the valve seat.
[0015]
A float steam trap according to a third aspect of the present invention has a float chamber, a main body having an inlet and an outlet communicating with the float chamber, and a float provided inside the float chamber so as to be movable up and down. A valve seat seal surface that communicates with the outlet and protrudes into the float chamber, and a cross-section of the outer peripheral edge of the valve seat seal surface is perpendicular to the valve seat. It is made of a material with a low degree of wear, and has a valve body seal surface that can be opened and closed by sliding with respect to the valve seat seal surface in conjunction with the vertical movement of the float, and with respect to the valve seat seal surface A valve body provided on the float so as to be able to come into contact with the edge by swinging with respect to a direction perpendicular to the valve seat seal surface when sliding; When the valve body slides with respect to the valve seat to open and close the valve seat, the valve body is worn and the sealing degree is increased, so that the frictional resistance is further reduced. The valve seat is made of stainless steel or other metal, and the valve body is made of carbon having a lower degree of wear resistance and higher hardness than the valve seat.
[0016]
A float steam trap according to a fourth aspect of the present invention has a float chamber, a main body having an inlet and an outlet communicating with the float chamber, and a float provided in the float chamber so as to be vertically movable. A valve seat communicating with the outlet in the float chamber, and a valve body provided in the float so as to be able to open and close the valve seat by sliding with respect to the valve seat in conjunction with the vertical movement of the float And When the valve body slides with respect to the valve seat and opens and closes the valve seat, the valve seat is worn and the sealing degree is increased, and the frictional resistance is further reduced. The valve body is made of stainless steel or other metal, and the valve seat is made of carbon having a lower degree of wear resistance and higher hardness than the valve body.
[0017]
A float steam trap according to a fifth aspect of the present invention has a float chamber, a main body having an inlet and an outlet communicating with the float chamber, and a float provided in the float chamber so as to be movable up and down. And a valve seat having a valve seat sealing surface that communicates with the outlet and protrudes into the float chamber, and is made of a material having a higher degree of wear resistance than the valve seat, and is provided on the float, A valve body seal surface capable of opening and closing the valve seat by sliding relative to the valve seat seal surface in conjunction with the vertical movement of the float, and a valve body having a sharp cross section at the edge of the valve body seal surface. Have When the valve body slides with respect to the valve seat and opens and closes the valve seat, the valve seat is worn and the sealing degree is increased, and the frictional resistance is further reduced. The valve body is made of stainless steel or other metal, and the valve seat is made of carbon having a lower degree of wear resistance and higher hardness than the valve body.
[0018]
A float steam trap according to a sixth aspect of the present invention has a float chamber, a main body having an inlet and an outlet communicating with the float chamber, and a float provided in the float chamber so as to be movable up and down. And a valve seat having a valve seat sealing surface provided in communication with the outlet and projecting into the float chamber, and a material having higher wear resistance than the valve seat, and interlocking with the vertical movement of the float And a valve body seal surface capable of opening and closing the valve seat by sliding with respect to the valve seat seal surface, and the cross section of the edge of the valve body seal surface forms an acute angle and slides with respect to the valve seat seal surface And a valve body provided on the float so as to be able to come into contact with the valve seat seal surface by swinging with respect to the vertical direction of the valve seat seal surface, When the valve body slides with respect to the valve seat and opens and closes the valve seat, the valve seat is worn and the sealing degree is increased, and the frictional resistance is further reduced. The valve body is made of stainless steel or other metal, and the valve seat is made of carbon having a lower degree of wear resistance and higher hardness than the valve body.
[0020]
According to the above-described float type steam trap according to the present invention, when the fluid enters the float chamber from the inflow port and the fluid is accumulated up to a predetermined amount in the float chamber, the float rises by buoyancy. The float can move up and down inside the float chamber. When the float rises, the valve body interlocks and slides against the valve seat to open the valve seat. Thereby, the fluid accumulated in the float chamber is discharged from the valve seat to the outlet. When the fluid is discharged from the float chamber, the float descends and the valve body slides to close the valve seat.
[0021]
Thus, since the valve body slides relative to the valve seat to open and close the valve seat, the apparatus can be miniaturized and the working pressure range can be widened. In addition, durability is improved and continuous discharge is possible when the amount of condensate is small. Further, since the change in the discharge area is gradual, it is possible to prevent the occurrence of water hammer due to the sudden closing of the inner valve. Furthermore, the sealing surface of the valve body is in contact with the flat surface with respect to the valve seat, and the higher the fluid pressure, the higher the surface pressure of the sealing surface.
[0022]
In the float steam trap according to the present invention, the valve seat and the valve body are made of materials having different wear resistances. Therefore, when the valve body slides relative to the valve seat and opens and closes the valve seat, The smaller the wear resistance of the body, the higher the sealing degree and the lower the frictional resistance. For this reason, the resistance of the opening and closing operation of the valve body is reduced with the passage of time of use, and the operating performance is improved. In addition, it is preferable that the valve body and the valve seat are biased with respect to each other so as to slide even when they are worn. The smaller the wear resistance of the valve seat or the valve body, the higher the hardness than the higher the wear resistance.
[0023]
Furthermore, in the float type steam trap according to the second aspect of the present invention, when the valve body slides with respect to the valve seat, the valve body seal surface of the valve body Perimeter Edges scrape off deposits such as surface scales and dirt. If scale or dirt adheres to the valve body and the valve seat, the frictional resistance on the surface of the valve body increases, which may cause a decrease in operable pressure. In the float type steam trap according to the second aspect of the present invention, the deposit on the valve body seal surface is peeled off to prevent a decrease in the operable pressure due to the deposit, to improve the operation performance, and to maintain an appropriate performance. can do.
[0024]
In the float type steam trap according to the third aspect of the present invention, when the valve body slides relative to the valve seat, the valve body seal surface of the valve body is Perimeter Edges scrape off deposits such as surface scales and dirt. At this time, the valve body swings with respect to the vertical direction of the valve seat seal surface, Perimeter Contact the edge. For this reason, it becomes easy to scrape off deposits on the surface of the valve body seal surface. If scale or dirt adheres to the valve body and the valve seat, the frictional resistance on the surface of the valve body increases, which may cause a decrease in operable pressure. First 3 In the float type steam trap according to the present invention, the deposit on the valve body seal surface is peeled off to prevent a decrease in operable pressure due to the deposit, to improve the operating performance, and to maintain an appropriate performance. Can do.
[0025]
In the float type steam trap according to the fifth aspect of the present invention, when the valve body slides with respect to the valve seat, the valve seat seal surface of the valve seat is attached to the surface of the valve body seal surface with an acute cross section, such as surface scale and dirt. Kimono is scraped off. If scale or dirt adheres to the valve body and the valve seat, the frictional resistance on the surface of the valve body increases, which may cause a decrease in operable pressure. First 5 In the float type steam trap according to the present invention, the deposit on the valve seat seal surface is peeled off to prevent a decrease in the operable pressure due to the deposit, to improve the operating performance, and to maintain the proper performance Can do.
[0026]
In the float type steam trap according to the sixth aspect of the present invention, when the valve body slides with respect to the valve seat, the valve seat seal surface of the valve seat is attached to the surface of the valve body seal surface with an acute cross section, such as surface scale or dirt. Kimono is scraped off. At this time, the valve body swings with respect to the direction of the vertical line of the valve seat seal surface to bring the edge into contact with the valve seat seal surface. For this reason, it becomes easy to scrape off deposits on the surface of the valve seat seal surface. If scale or dirt adheres to the valve body and the valve seat, the frictional resistance on the surface of the valve body increases, which may cause a decrease in operable pressure. First 6 In the float type steam trap according to the present invention, the deposit on the valve seat seal surface is peeled off to prevent a decrease in the operable pressure due to the deposit, to improve the operating performance, and to maintain the proper performance Can do.
[0027]
In the present invention, it is preferable that a gap is provided between the valve body and the support member for the valve body in order to facilitate the swinging of the valve body.
[0028]
Even if the float is provided with a guide member inside the float chamber and can be moved up and down by sliding with respect to the guide member, the float is fixed to one end of the lever, and the other end of the lever is attached to the main body. It may be provided so that it can move up and down by being provided so as to be rotatable. The number of valve seats may be one or more.
[0029]
The float steam trap according to the present invention further includes a holder, and the holder has a flow path communicating with the outlet and is fixed to the main body inside the float chamber, and the valve seat Is provided in the holder so as to communicate with the flow path, the float has a float and a lever, the valve body is provided in the lever, the lever is fixed at one end to the float, and the valve body is It is preferable that the other end side of the holder is rotatably provided so that the valve seat can be opened and closed by sliding with respect to the valve seat in conjunction with the vertical movement of the float.
[0030]
According to this configuration, when buoyancy acts on the float, one end of the lever rotates upward with respect to the holder, the valve body slides with respect to the valve seat, and the valve seat is opened. Thereby, the fluid accumulated in the float chamber is discharged from the outlet through the flow path of the valve seat and the holder. When the fluid is discharged from the float chamber, the float descends, one end of the lever rotates downward with respect to the holder, and the valve body slides against the valve seat to close the valve seat. With this configuration, the structure is simple and the device can be small.
[0031]
Further, by changing the distance between the rotation center of the lever and the center of the valve body, the lever ratio (L1 / L2) can be increased, the working pressure range can be easily widened, and high pressure use can be accommodated. In addition, since the lever ratio (L1 / L2) can be increased, it is possible to reduce the size as compared with devices having the same discharge capacity and the same operating pressure. Further, the float float is integrated with the lever, and the movement of the float is restricted only by the vertical rotation motion, so that the float can be prevented from being damaged even by disturbances such as vibrations, and the breakage of the float can be prevented.
[0032]
In addition, it is preferable that the said valve seat is provided in the said holder so that it may connect with the said flow path by the bottom part side of the said main body from the said inflow port and the said outflow port. Furthermore, if the lever is easily removed from the holder, the maintenance can be facilitated. The number of valve seats may be one or more, and the valve seats may be provided on both sides of the holder or only on one side.
[0033]
In the float type steam trap according to the present invention, it is preferable that the valve seat includes a plurality of valves and the valve body includes a plurality corresponding to each valve seat.
[0034]
According to this configuration, the range of discharge capacity can be widened by increasing the number of valve seats, and it is also possible to deal with the common use of parts. Moreover, the discharge capacity can be easily changed by closing the valve seat. In this case, it is preferable that the valve seat can be easily replaced with the plug.
[0035]
In the float type steam trap according to the present invention, the holder has a plurality of valve seats, a plurality of the valve bodies are provided on the levers corresponding to the valve seats, and the levers each of the valve bodies are provided on the float. It is preferable that the other end is rotatably provided on the holder so that the valve seat can be opened and closed by sliding with respect to the valve seat in conjunction with the vertical movement. In this case, the holder is preferably provided with a plurality of valve seats on the side surface.
[0036]
In the float type steam trap according to the present invention, it is preferable that the valve body is provided so as to be rotatable with respect to the float about an axis perpendicular to a sliding direction.
[0037]
According to this configuration, the valve body is not fixed to the float, but is provided so as to be rotatable. Therefore, the valve body can freely rotate when sliding with the valve seat. For this reason, the seal surface is not easily damaged, and the fluid scale is less likely to adhere to the valve seat, so that the valve closing performance can be maintained and the life of the parts can be extended. In addition, it is preferable that the said valve body is provided in the said float so that rotation is possible centering | focusing on the axis line of the direction of sliding and the perpendicular direction to the sealing surface of the said valve seat. Moreover, it is preferable that the valve body is rotatably provided on the lever.
[0038]
In the float steam trap according to the present invention, the valve seat and the sealing surface of the valve body may each have a curved shape protruding from the periphery in a direction facing each other.
[0039]
According to this structure, compared with the case where the sealing surface of the valve seat and the valve body is a simple flat shape, the valve seat is increased in surface pressure to increase the valve closing performance, and damage to the valve seat is reduced. be able to.
[0040]
In the float steam trap according to the present invention, the main body may be opened and closed, and the holder may be detachably fixed to the main body.
[0041]
According to this configuration, the float, the valve body and the holder can be taken out to the outside simply by opening the main body and removing the holder from the main body without removing the main body from the pipe after being installed in the pipe. Can save time and money.
[0042]
DETAILED DESCRIPTION OF THE INVENTION
1 to 12 show an embodiment of the present invention.
As shown in FIG. 1, the float type steam trap has a main body 1, a strainer 2, a holder 3, a float 4, a valve seat 5, and a valve body 6. The main body 1 is formed by screwing a cover 1b to a body 1a with a bolt 7 so as to be opened and closed.
[0043]
The main body 1 has a float chamber 1c inside, and has an inlet 1d and an outlet 1e communicating with the float chamber 1c. The inflow port 1d and the outflow port 1e are for inflowing or outflowing condensate. A hole is formed in the side wall near the bottom of the main body 1, and the hole is closed with a plug 1g. The strainer 2 is provided on the inflow side of the float chamber 1c in the vicinity of the opening 1h of the body 1a in order to prevent the inflow of foreign matter such as dust.
[0044]
The holder 3 is tubular, and is detachably fixed to the outlet 1e inside the float chamber 1c of the main body 1. The holder 3 has a flow path 3a communicating with the outflow port 1e. The holder 3 extends between the outlet 1e and the bottom 1f. As shown in FIG. 2, the valve seat 5 is fixed to the side surfaces on both sides of the bottom side end of the holder 3 so as to communicate with the flow path 3 a or the outlet 1 e. Each valve seat 5 is detachably screwed into a hole formed in the holder 3. As shown in FIG. 9, each valve seat 5 has an opening 5 a that can be opened and closed by a valve body 6. Condensate can be discharged from the outlet 1 e through the opening 5 a of each valve seat 5.
[0045]
As shown in FIGS. 11A and 11B, each valve seat 5 has a valve seat seal surface 5b around the opening 5a. The valve seat seal surface 5b is provided so as to protrude into the float chamber. As shown in FIG. 11 (b), each valve seat 5 has a valve seat seal surface 5b. Perimeter The cross section of the edge 5c forms a right angle, and the valve seat seal surface 5b protrudes from the outer peripheral side end surface 5d with a step.
[0046]
In addition, as shown in FIG. 3, it is preferable that the valve seat 5 is easy to replace | exchange with the plug body 8 which does not have the opening 5a. Moreover, as shown in FIG. 4, the valve seat 5 may be arrange | positioned outside and the valve body 6 may be arrange | positioned inside. Furthermore, as shown in FIG. 5, the valve seat 5 and the valve body 6 may each consist of one piece. 6A and 6B, the valve seat 5 and the valve body 6 may be provided two on one side of the holder 3 and four on both sides.
[0047]
The float 4 has a float 4a and a lever 4b that are spherical, oblong, or other shapes. The float 4 is provided in the float chamber 1c so as to be movable up and down.
Since the inside of the float 4a is hermetically sealed, buoyancy works according to the amount of condensate.
The lever 4b is bent in two and extends so as to protrude from the float 4a. As shown in FIG. 2, the valve body 6 is attached to both side surfaces of the bifurcated lever 4b at a position facing the valve seat 5 so as to be rotatable about the rotation center 6a. The valve body 6 has a valve body seal surface 6b that can slide with respect to the valve seat seal surface 5b in conjunction with the vertical movement of the float 4 to open and close the valve seat 5. The outer periphery of the valve body seal surface 6b is curved and rounded toward the side surface 6c.
[0048]
The lever 4b has one end of the bent portion fixed to the floating 4a, and the other end sandwiched with the holder 3 and is rotatably fixed to both sides with pins 4c. Therefore, the lever 4b moves up and down in the float chamber 1c with the pin 4c as a fulcrum. Thereby, the valve body 6 rotates with the lever 4b in conjunction with the vertical movement of the float 4a, and can slide with respect to the valve seat 5 to open and close the valve seat 5. The valve body 6 is attached to the lever 4b so as to be rotatable about an axis in a direction perpendicular to the sliding direction and the valve seat seal surface 5b (see FIG. 8) of the valve seat 5. The valve body 6 is provided with a gap in the mounting hole 4d of the lever 4b. When the valve body 6 slides with respect to the valve seat seal surface 5b, the valve body 6 swings with respect to the vertical direction of the valve seat seal surface 5b. 6b can be brought into contact with the edge 5c. As shown in FIG. 7, when the valve body 6 closes the valve seat 5, the rotation center 6 a of the valve body 6 and the center 5 c of the opening 5 a of the valve seat 5 may be designed to deviate from each other. For this reason, the surface pressure of the valve seat seal surface 5b and the valve body seal surface 6b generated by the fluid force becomes uneven, and the valve body 6 is easy to rotate.
[0049]
The valve seat 5 is made of stainless steel. The valve body 6 is made of a carbon-based material. The material constituting the valve body 6 is a material that can be easily manufactured with a coefficient of friction smaller than that of the stainless steel constituting the valve seat 5, and is more resistant to wear than a general valve seat and valve body made of stainless steel. Is considerably small and has high hardness. By making the valve body from a carbon-based material having a low coefficient of friction, the operable pressure of the trap can be increased. In one example, stainless steel having a hardness of HRC 11 or 56 can be used as the material for the valve seat 5, and carbon having a hardness of HRC 68 can be used as the material for the valve body 6. In the case of carbon, the hardness is high, but the degree of bonding between particles is low, and therefore, when carbon is slid with stainless steel, it is easy to wear.
[0050]
Conventionally, metal has been used for the material of the valve seat and valve body, and in order to reduce the frictional resistance of the seal surface, the processing accuracy has been increased to smooth the surface, and the surface health has been maintained even during use. In order to increase the wear resistance of the surface, a heat treatment or an alloy is deposited. Such processing has been a factor in raising manufacturing costs. On the other hand, in this float type steam trap, since the valve body 6 is made of a non-metallic material, that is, a carbon-based material or a ceramic-based material, which can easily manufacture a material having a smaller coefficient of friction than metal, the metal is used as the material. Manufacturing is easier than in the case, and the manufacturing cost can be reduced.
[0051]
The force required for operation, that is, the force F necessary for the valve body to slide and move on the valve seat,
F = μ × A × P μ; coefficient of friction A; valve seat area P; fluid pressure
It is represented by Since A and P are constant values when the trap size and conditions are determined, the force F is a function of the friction coefficient μ. Normally, metal is used for the material of the valve seat, but in order to reduce the friction coefficient μ, the surface is made smooth (to increase the processing accuracy), and the surface wear resistance is increased (heat treatment and alloy are welded). ) When a self-lubricating carbon material is used as the material for the sliding portion, μ is reduced to about ½ that of the metal material, so that the force F required for operation is also reduced to about ½. Therefore, when the trap size and usage conditions are constant, the apparatus can be made smaller. If the size of the apparatus is constant, the working pressure can be increased.
[0052]
Both the valve seat 5 and the valve body 6 may be made of a carbon-based material or a ceramic-based material. The material of the valve seat 5 may be carbon or ceramic, and the material of the valve body 6 may be stainless steel or other metal. In the case of carbon, the coefficient of friction is smaller than that of stainless steel, and the hardness is high but the degree of bonding between particles is small. There is. The material constituting the valve body 6 may have a higher wear resistance than the material constituting the valve seat 5.
[0053]
In the float type steam trap, the valve seat 5 and the valve body 6 are made of materials having different wear resistances. Therefore, when the valve body 6 slides relative to the valve seat 5 to open and close the valve seat 5, the valve seat 5 Compared to the above, the valve body 6 having a small wear resistance is worn, the sealing degree is increased, and the frictional resistance is further reduced. For this reason, the resistance of the opening / closing operation | movement of the valve body 6 becomes small with progress of use time, and an operating performance improves.
[0054]
As the valve body 6 slides on the seal surface 5b of the valve seat 5, the carbon wears, but the surface of the carbon becomes smooth as it is polished with the same effect as the grinding process. In addition to the friction coefficient being smaller than that of metal, the surface roughness becomes finer, so a double effect can be expected. Carbon is excellent in heat resistance and can be used up to 400 ° C. In the case of a steam trap, the fluid used is saturated water or saturated steam, so that it can be used under all conditions in view of the saturated vapor pressure.
[0055]
As shown in FIGS. 12 (a) and 12 (b), as a modification of the valve seat 5 and the valve body 6, the valve body seal of the valve body 6 is used instead of the cross section of the edge 5c of the valve seat seal surface 5b being a right angle. The cross section of the edge 6d of the surface 6b may form an acute angle. In this case, the edge 5c of the valve seat 5 is curved and rounded. Also in this case, the valve seat 5 and the valve body 6 are made of a carbon-based material or a ceramic-based material that can easily manufacture a material having a smaller coefficient of friction than metal, and are made of a general valve seat and valve body made of metal. However, the coefficient of friction is considerably small. Since the valve seat 5 and the valve body 6 made of such a material are easier to manufacture than the case of using a metal as a material, the manufacturing cost can be reduced.
[0056]
As shown in FIG. 8, as a modification of the valve seat 5 and the valve body 6, the valve seat seal surface 5 b of the valve seat 5 and the valve body seal surface 6 b of the valve body 6 protrude from the surroundings in directions opposite to each other. It may have a curved surface and the periphery may be inclined in a tapered shape. Thereby, compared with the case where the valve seat seal surface 5b of the valve seat 5 and the valve body seal surface 6b of the valve body 6 are made into a simple flat shape, the surface area of the valve seat 5 is reduced by reducing the substantial valve seat area. The valve closing performance can be increased by increasing the valve closing performance. Further, since the taper shape reduces the number of catches during opening and closing compared to a simple flat shape, there is a feature that parts are not easily damaged.
[0057]
As shown in FIG. 1, in the float type steam trap, the condensate flowing from the steam using equipment, steam piping or the like (not shown) passes through the strainer 2 from the inlet 1d and enters the float chamber 1c. It gradually accumulates in the chamber 1c. The float 4 can move up and down inside the float chamber 1c. When the condensate accumulates to a predetermined amount in the float chamber 1c, the float 4 rises by buoyancy.
[0058]
When buoyancy is applied to the float 4, one end of the lever 4 b rotates upward with respect to the holder 3, and the valve body 6 interlocks and slides upward with respect to the valve seat 5 to open the opening 5 a of the valve seat 5. Thereby, the fluid accumulated in the float chamber 1 c is discharged from the outlet 1 e through the valve seat 5 and the flow path 3 a of the holder 3. When the condensate is discharged from the float chamber 1c, the float 4 descends, one end side of the lever 4b rotates downward with respect to the holder 3, and the valve body 6 slides downward with respect to the valve seat 5 to move the valve seat. Close 5
[0059]
Since the fluid pressure always works in the direction of pressing the valve body 6 against the valve seat 5, the surface pressure of the valve seat seal surface 5b of the valve seat 5 and the valve body seal surface 6b of the valve body 6 increases as the fluid pressure increases. Moreover, since the valve body 6 and the valve seat 5 slide and move on a plane, the valve closing performance is excellent.
[0060]
Thus, since the valve body 6 slides with respect to the valve seat 5 to open and close the valve seat 5, the structure is simple, the apparatus can be miniaturized and the working pressure range can be widened. As shown in FIG. 9, since the valve body 6 moves so as to slide with respect to the valve seat 5, the change in the opening area of the valve seat 5 due to the float lift (change in the water level) is an interference area between the circle and the circle ( (Indicated by diagonal lines). As shown in FIG. 10, the change in the opening area is much more gradual than that of a vertically moving valve seat or a spherical valve seat. For this reason, generation | occurrence | production of the water hammer accompanying the sudden closing of the inner valve can be prevented. In the open state, continuous drainage is possible even when the amount of condensate is small. Since the number of operations is reduced, durability can be improved and the life of parts can be extended.
[0061]
Furthermore, since the valve body 6 can be installed at a position close to the pin 4c, which is the fulcrum of the lever 4b, the lever ratio (L1 / L2, FIG. 1) is compared with the structure in which the valve seat 5 is installed outside the conventional lever fulcrum. Can be dramatically increased. For this reason, it can respond to high-pressure use, and can attain size reduction of an apparatus by extension.
[0062]
In addition, the float 4a of the float 4 is integrated with the lever 4b, and the movement of the float 4 is restricted only by the vertical rotation motion, so that the float 4 is not unraveled by disturbances such as vibrations, and the float 4 is prevented from being damaged. it can. Since the lever 4b can be easily detached from the holder 3, it can be removed from the main body 1 to facilitate maintenance.
[0063]
One or a plurality of valve seats 5 can be provided on one side or both sides of the side surface of the holder 3 according to the required discharge amount. For this reason, by increasing the number of the valve seats 5, the corresponding range of the discharge performance is widened, and the parts can be shared. Further, by closing the valve seat 5, the discharge capacity can be easily changed. Conventionally, when the hole diameter of the valve seat 5 is increased in order to increase the discharge capacity, the fully open state cannot be achieved unless the operating angle of the float 4 is increased. On the other hand, when the valve seat 5 and the valve body 6 are composed of a plurality, even if the operating angle of the float 4 is small, the opening area can be increased and the discharge capacity can be increased.
[0064]
In the float type steam trap, the valve body 6 is not fixed to the lever 4b but is provided so as to be rotatable on the lever 4b, so that it can freely rotate when sliding with the valve seat 5. it can. For this reason, the valve seat seal surface 5b and the valve body seal surface 6b are hardly damaged. Moreover, there exists a self-cleaning effect | action which removes the scale adhering to the valve seat 5, and while having the effect which improves valve closing performance, the lifetime improvement of components can be achieved.
[0065]
After the float type steam trap is installed in the pipe, the cover 4b is removed from the body 1a without removing the main body 1 from the pipe, the main body 1 is opened, the holder 3 is simply removed from the main body 1, and the float 4, the valve body 6, Since the parts in which the valve seat 5 and the holder 3 are integrated can be taken out to the outside in a lump, maintenance labor and cost can be reduced.
[0066]
Furthermore, as shown in FIG. 11, in this float type steam trap, when the valve body 6 slides with respect to the valve seat 5, the valve body seal surface 6 of the valve body 6 has an edge 5c of the valve seat seal surface 5b having a right-angle cross section. The deposit S such as the scale and dirt on the surface of the valve body seal surface 6b is scraped off by being pressed. At this time, the valve body 6 swings with respect to the direction of the vertical line of the valve seat seal surface 5b to bring the valve body seal surface 6b into contact with the edge 5c. For this reason, it becomes easy to scrape off the deposit S on the surface of the valve body seal surface 6b.
[0067]
In the conventional float type steam trap in which the valve body slides against the valve seat, depending on the installed equipment and the condition in the piping, dirt (scale) in the condensate adheres to the valve body and the valve seat, and the valve It can increase the frictional resistance of the body surface and, as a result, cause a reduction in the operable pressure of the steam trap during use. On the other hand, in the float type steam trap shown in FIG. 11, by reducing the deposit on the valve body seal surface 6b, the operable pressure is prevented from being lowered by the deposit S, the operating performance is improved, and the proper performance is obtained. The performance can be maintained. The edge 5c is particularly effective when operating in the closing direction from the vicinity of the fully open position.
[0068]
As shown in FIGS. 12A and 12B, when the cross section of the edge 6d of the valve body seal surface 6b of the valve body 6 forms an acute angle, the valve body 6 slides with respect to the valve seat 5. The deposit S such as scale and dirt on the surface is scraped off so that the valve seat seal surface 5b of the valve seat 5 is pressed by the edge 6d of the valve body seal surface 6b having an acute cross section. At this time, the valve body 6 is swung with respect to the direction of the vertical line of the valve seat seal surface 5b to bring the edge 6d into contact with the valve seat seal surface 5b. For this reason, it becomes easy to scrape off the deposit S on the surface of the valve seat seal surface 5b. If scale or dirt adheres to the valve body 6 and the valve seat 5, the frictional resistance on the surface of the valve body increases, which may cause a decrease in operable pressure. By peeling off the deposit S on the valve seat seal surface 5b, it is possible to prevent a decrease in the operable pressure due to the deposit S, improve the operating performance, and maintain an appropriate performance. During operation, the pressure in the trap works in a direction to press the valve body 6 against the valve seat 5, so that the higher the pressure, the greater the effect of the edge 6d.
[0069]
【The invention's effect】
According to the float type steam trap concerning the present invention, it is possible to reduce the size of the apparatus and increase the drainage capacity. Furthermore, since the valve body slides on the plane with respect to the valve seat, the valve closing performance is high and the opening area of the valve is gradual, preventing the occurrence of water hammer due to the sudden closing of the inner valve. be able to. Furthermore, according to the float type steam trap which concerns on this invention, closing performance can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a float type steam trap according to an embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view corresponding to a cross-sectional view taken along the line II-II of FIG. 2 of a modification of the float steam trap of FIG.
4 is a cross-sectional view corresponding to the cross-sectional view taken along the line II-II of FIG. 2, of another modification of the float steam trap of FIG.
5 is a cross-sectional view corresponding to the cross-sectional view taken along the line II-II of FIG. 2, of another modification of the float steam trap of FIG.
6A is an explanatory diagram showing a modification of the float steam trap shown in FIG. 1 with a plurality of valve seats attached, and FIG. 6B is a cross-sectional view corresponding to the cross-sectional view taken along the line II-II in FIG. .
FIG. 7 is an explanatory view showing the deviation of the center of the valve body and the valve seat of the float type steam trap of FIG. 1;
FIG. 8 is an enlarged cross-sectional view of a main part showing a modification of the valve body and the valve seat of the float type steam trap of FIG. 1;
9 is an explanatory view showing a change in the opening area of the valve seat of the float type steam trap of FIG. 1. FIG.
10 is a graph showing a change in the opening area of the valve seat of the float type steam trap of FIG. 1. FIG.
11A is a sectional view showing a valve body and a valve seat of the float type steam trap of FIG. 1, and FIG.
12A is a cross-sectional view showing a modified example of the valve body and the valve seat of the float type steam trap of FIG. 1, and FIG.
FIG. 13 is a cross-sectional view showing a conventional float type steam trap.
FIG. 14 is a cross-sectional view showing another conventional float steam trap.
[Explanation of symbols]
1 Body
1a body
1b cover
1c Float room
1d inlet
1e outlet
2 Strainer
3 Holder
4 Float
4a floating
4b lever
5 Valve seat
6 Disc

Claims (6)

A main body having a float chamber and having an inlet and an outlet communicating with the float chamber;
A float provided in the float chamber so as to be movable up and down;
A valve seat communicating with the outlet in the float chamber;
A valve body provided on the float so as to be able to open and close the valve seat by sliding with respect to the valve seat in conjunction with the vertical movement of the float;
When the valve body slides with respect to the valve seat and opens and closes the valve seat , the valve seat is made of stainless steel or other metal so that the valve body is worn and the sealing degree is increased and the frictional resistance is further reduced. The float steam trap is characterized in that the valve body is made of carbon having a lower wear resistance and a higher hardness than the valve seat. A main body having a float chamber and having an inlet and an outlet communicating with the float chamber;
A float provided in the float chamber so as to be movable up and down;
A valve seat having a valve seat seal surface provided in communication with the outlet and projecting into the float chamber, and a cross-section of an outer peripheral edge of the valve seat seal surface is a right angle; and
A valve body seal surface made of a material having a lower wear resistance than the valve seat, provided on the float, and capable of opening and closing the valve seat by sliding relative to the valve seat seal surface in conjunction with the vertical movement of the float And a valve body having
When the valve body slides with respect to the valve seat and opens and closes the valve seat , the valve seat is made of stainless steel or other metal so that the valve body is worn and the sealing degree is increased and the frictional resistance is further reduced. The float steam trap is characterized in that the valve body is made of carbon having a lower wear resistance and a higher hardness than the valve seat. A main body having a float chamber and having an inlet and an outlet communicating with the float chamber;
A float provided in the float chamber so as to be movable up and down;
A valve seat having a valve seat seal surface provided in communication with the outlet and projecting into the float chamber, and a cross-section of an outer peripheral edge of the valve seat seal surface is a right angle; and
The valve seat is made of a material having a lower wear resistance than the valve seat, and has a valve body seal surface that can be opened and closed by sliding with respect to the valve seat seal surface in conjunction with the vertical movement of the float. A valve body provided on the float so that the valve body seal surface can come into contact with the edge by swinging with respect to the vertical direction of the valve seat seal surface when sliding with respect to the seat seal surface;
When the valve body slides with respect to the valve seat and opens and closes the valve seat , the valve seat is made of stainless steel or other metal so that the valve body is worn and the sealing degree is increased and the frictional resistance is further reduced. The float steam trap is characterized in that the valve body is made of carbon having a lower wear resistance and a higher hardness than the valve seat. A main body having a float chamber and having an inlet and an outlet communicating with the float chamber;
A float provided in the float chamber so as to be movable up and down;
A valve seat communicating with the outlet in the float chamber;
A valve body provided on the float so as to be able to open and close the valve seat by sliding with respect to the valve seat in conjunction with the vertical movement of the float;
When the valve body slides with respect to the valve seat and opens and closes the valve seat, the valve body is made of stainless steel or other metal so that the valve seat is worn and the sealing degree is increased and the frictional resistance is further reduced. The float-type steam trap is characterized in that the valve seat is made of carbon having a lower wear resistance and a higher hardness than the valve body. A main body having a float chamber and having an inlet and an outlet communicating with the float chamber;
A float provided in the float chamber so as to be movable up and down;
A valve seat having a valve seat seal surface provided in communication with the outlet and projecting into the float chamber;
A valve body seal surface made of a material having a higher wear resistance than the valve seat, provided on the float, and capable of opening and closing the valve seat by sliding relative to the valve seat seal surface in conjunction with the vertical movement of the float And has a valve body in which a cross section of an edge of the valve body sealing surface forms an acute angle,
When the valve body slides with respect to the valve seat and opens and closes the valve seat, the valve body is made of stainless steel or other metal so that the valve seat is worn and the sealing degree is increased and the frictional resistance is further reduced. The float-type steam trap is characterized in that the valve seat is made of carbon having a lower wear resistance and a higher hardness than the valve body. A main body having a float chamber and having an inlet and an outlet communicating with the float chamber;
A float provided in the float chamber so as to be movable up and down;
A valve seat having a valve seat seal surface provided in communication with the outlet and projecting into the float chamber;
The valve seat is made of a material having a higher degree of wear resistance than the valve seat, and has a valve body seal surface that slides with respect to the valve seat seal surface in conjunction with the vertical movement of the float and can open and close the valve seat, The cross section of the edge of the body seal surface has an acute angle, and when sliding with respect to the valve seat seal surface, the edge can be brought into contact with the valve seat seal surface by swinging with respect to the vertical direction of the valve seat seal surface A valve body provided in the float,
When the valve body slides with respect to the valve seat and opens and closes the valve seat, the valve body is made of stainless steel or other metal so that the valve seat is worn and the sealing degree is increased and the frictional resistance is further reduced. The float-type steam trap is characterized in that the valve seat is made of carbon having a lower wear resistance and a higher hardness than the valve body.

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