JP3453682B2 - Float type steam trap - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap that is connected to steam-using equipment, steam piping, etc. and automatically discharges condensed water.

[0002]

2. Description of the Related Art A conventional float type steam trap is shown in FIGS. In the float type steam trap 50 shown in FIG. 11, a cylindrical inner valve 53 is fixed to a lever 52 having one end fixed to the float 51 and the other end rotatably supported. Float 5
It is configured to move up and down following the up and down movement of 1.

A float type steam trap 60 shown in FIG. 12 has a spherical inner valve 6 at the lower end of a lever 62, one end of which is fixed to a float 61 and the other end of which is rotatably supported.
3 is fixed, and the inner valve 63 opens and closes together with the turning operation of the lever 62.

In these float type steam traps shown in FIGS. 11 and 12, the buoyancy of the float 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 is the inner valve. Let L2 be the distance to the mounting position of A, the cross-sectional area of the outlet be A, and the pressure difference of the condensate between the inlet side and the outlet side of the outlet be ΔP, the condition for opening the valve is expressed by the following equation. . F × L1> A × ΔP × L2 ・ ・ ・ Equation (1)

However, in the conventional float type steam trap, in order to open the valve, it is sufficient to increase F or L1 in the formula (1) or decrease A or ΔP, L2, but increase F or L1. That is, there is a problem that the entire device becomes large.

Further, decreasing A causes a decrease in discharge capacity, and decreasing L2 results in a decrease in condensate discharge capacity because the lift amount of the inner valve cannot be taken. Furthermore Δ
Reducing P limits the use conditions and causes a problem that versatility is lost.

Further, the valve seat system for determining the valve closing performance of the conventional float type steam trap is the vertically moving surface contact system shown in FIG. 11 and the spherical line contact system shown in FIG. For this reason, the closing performance and durability are not perfect, and there is a problem that steam leakage occurs.

Therefore, in order to solve these problems, in the past, a float type steam trap having a large discharge capacity had a large size of the entire apparatus and had a small usable ΔP. In addition, the discharge capacity was small when the device was downsized or the usable ΔP was large. Therefore, in order to satisfy a wide range of specifications, there is a tendency that the number of models increases and the size of the device increases.

[0009]

Problems to be solved by the present invention include the following problems required for the float type steam trap. 1) To reduce the size of the conventional large-sized apparatus as a whole, increase the drainage capacity, and widen the working pressure range. 2) Improving closing performance and durability, eliminating unnecessary waste of steam, and realizing economical operation. 3) Prevent the occurrence of water hammer associated with the sudden closure of the inner valve. 4) Enables continuous discharge even with a small amount of condensate inflow in a device with a large condensate discharge capacity. 5) Prevent the float from being damaged by sudden disturbance of disturbance such as condensate inflow or vibration during transportation of the equipment.

The present invention has been made by paying attention to such problems of the prior art, and it is possible to reduce the size of the apparatus, enhance the drainage capacity, improve the valve closing performance, and prevent the occurrence of water hammer. The purpose is to provide a conventional float type steam trap.

[0011]

In order to achieve the above object, a float type steam trap according to the present invention of claim 1 has a float chamber, and an inlet and an outlet communicating with the float chamber are provided. A body having, a float provided to be movable up and down inside the float chamber, a valve seat communicating with the outflow port inside the float chamber, and a valve seat linked to the vertical motion of the float with respect to the valve seat. A valve body provided on the float so that the valve seat can be opened and closed by sliding.
The sealing surfaces of the valve seat and the valve body are curved surfaces projecting from the surroundings in directions opposite to each other, and the surroundings are tapered.

According to the above construction, when the fluid enters the float chamber through the inflow port and the fluid is accumulated in the float chamber up to a predetermined amount, the float rises due to 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. As a result, the fluid accumulated in the float chamber is discharged from the valve seat to the outflow port. When the fluid is discharged from the float chamber,
The float descends and the valve body slides to close the valve seat.

As described above, since the valve body slides on the valve seat to open and close the valve seat, the device can be downsized and the working pressure range can be widened. Furthermore, it improves durability and enables continuous discharge when the amount of condensed water is small. Further, since the change in the discharge area is gradual, it is possible to prevent the occurrence of a water hammer associated with the sudden closing of the inner valve.
Further, the sealing surface of the valve element is in flat contact with the valve seat, and the higher the fluid pressure, the higher the surface pressure of the sealing surface. Further, compared with the case where the sealing surfaces of the valve seat and the valve body are made into a simple flat shape by the configuration in which the sealing surfaces of the valve seat and the valve body are formed in a curved surface shape protruding from the surroundings in the directions opposite to each other. As a result, the surface pressure of the valve seat can be increased to increase the valve closing property, and damage to the valve seat can be reduced.

Even if the float is provided with a guide member inside the float chamber and is vertically movable 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. May be rotatably provided on the main body so as to be vertically movable. The number of valve seats may be one or more.

According to a second aspect of the present invention, in the float type steam trap according to the first aspect of the present invention, a holder is further provided, and the holder has therein a flow path communicating with the outlet. The valve seat is fixed to the main body inside the float chamber, the valve seat is provided to the holder so as to communicate with the flow path, the float has a float and a lever, and the valve body is provided to the lever, One end of the lever is fixed to the float, and the valve body slides with respect to the valve seat in conjunction with the vertical movement of the float to open and close the valve seat, and the other end is rotatably provided to the holder. It is characterized by being.

According to the above construction, when buoyancy acts on the float, one end side of the lever rotates upward with respect to the holder, the valve body slides with respect to the valve seat, and the valve seat opens. As a result, the fluid accumulated in the float chamber is discharged from the outflow port through the valve seat and the flow path of 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 with respect to the valve seat to close the valve seat. With this configuration, the device has a simple structure and can be made small.

Furthermore, by changing the distance between the center of rotation of the lever and the center of the valve body, the lever ratio (L1 / L2) can be increased, the operating pressure range can be easily widened, and high pressure use is possible. it can. Further, the float float is integrated with the lever, and the movement of the float is restricted only to the vertical rotation motion. Therefore, the float is not violated even by disturbance such as vibration, and damage to the float can be prevented.

It is preferable that the valve seat is provided in the holder so as to communicate with the flow path on the bottom side of the main body with respect to the inflow port and the outflow port. further,
If the lever is easily removed from the holder, 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 on only one side.

Further, in the float type steam trap according to the present invention of claim 3, in the structure of claim 2, the holder has a plurality of valve seats on one side, and the valve element corresponds to each valve seat. A plurality of levers are provided on the lever. The levers are provided such that each valve element slides with respect to each valve seat in conjunction with the vertical movement of the float to open and close each valve seat, and the other end side is rotatable on the holder. It is characterized by that.

According to the above construction, by increasing the number of valve seats, the corresponding range of discharge capacity can be widened, and moreover, common parts can be dealt with. Also, by closing the valve seat, the discharge capacity can be easily changed. In this case, it is preferable that the valve seat can be easily replaced with the stopper.

[0021]

Further, in the float type steam trap according to the present invention of claim 4, in the structure of claim 1, 2 or 3, the valve element can rotate in the float about an axis perpendicular to the sliding direction. The center of rotation of the valve body and the center of the opening of the valve seat are displaced from each other when the valve body closes the valve seat.
Characterize.

According to the above construction, the valve body is not fixed to the float but is provided so as to be rotatable, so that it can freely rotate when sliding with the valve seat. Therefore, the sealing surface is not easily scratched, and
The scale of the fluid is less likely to adhere to the valve seat, and the valve closing performance can be maintained and the service life of the parts can be extended. In addition,
It is preferable that the valve body is rotatably provided on the float about an axis in a sliding direction and a direction perpendicular to a sealing surface of the valve seat. In addition, it is preferable that the valve body is rotatably provided on the lever in the structure of claim 2.

Further, in the float type steam trap according to the present invention of claim 5, in the constitution of claim 1, 2, 3 or 4, the sealing surfaces of the valve seat and the valve body are easily exchangeable with the valve seat. It is characterized by having a simple stopper.

[0025]

Further, in the float type steam trap according to the present invention of claim 6, in the structure of claim 2, 3 or 4, the main body can be opened and closed, and the holder is detachably fixed to the main body. It is characterized by that.

According to the above construction, after installation in the pipe, the float, the valve body and the holder can be collectively taken out by opening the main body and removing the holder from the main body without removing the main body from the pipe. Therefore, the labor and cost of maintenance can be reduced.

[0028]

1 to 10 show an embodiment of the present invention. As shown in FIG. 1, the float type steam trap includes a main body 1, a strainer 2, and a holder 3.
It has a float 4, a valve seat 5, and a valve body 6.
The main body 1 is formed by fixing a cover 1b to a body 1a with a bolt 7 so that the cover 1b can be opened and closed.

The main body 1 has a float chamber 1c inside,
It 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 condensed water. 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 designed to prevent foreign matter such as dust from flowing in.
It is provided on the inflow side of the float chamber 1c near the opening 1h of the body 1a.

The holder 3 is tubular and is detachably fixed to the outflow port 1e inside the float chamber 1c of the main body 1. The holder 3 has a flow path 3a inside which communicates with the outlet 1e. The holder 3 includes an outlet 1e and a bottom 1
It extends between f. As shown in FIG. 2, the valve seat 5 is
The holder 3 is fixed to both sides of the bottom side end so as to communicate with the flow path 3a or the outlet 1e. 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 the valve body 6. Condensate can be discharged from the outlet 1e through the opening 5a of each valve seat 5.

As shown in FIG. 3, the valve seat 5 is preferably easy to replace with the plug 8 having no opening 5a. Further, as shown in FIG. 4, the valve seat 5 may be arranged outside and the valve body 6 may be arranged inside. Furthermore, as shown in FIG.
Each of the valve seat 5 and the valve body 6 may be composed of one piece.
Further, as shown in FIGS. 6A and 6B, two valve seats 5 and two valve bodies 6 may be provided on one side of the holder 3 and four on both sides.

The float 4 has a float 4a having a spherical shape, an oblong shape, and other shapes, and a lever 4b. Float 4
Is provided in the float chamber 1c so as to be vertically movable. Since the inside of the float 4a is hermetically sealed, buoyancy acts according to the amount of condensed water. The lever 4b is bifurcated and extends so as to project 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.
The valve body 6 can be opened and closed by sliding with respect to the valve seat 5 in conjunction with the vertical movement of the float 4.

One end of the bent portion of the lever 4b is fixed to the float 4a, and the other end of the lever 4b sandwiches the holder 3 and is rotatably fixed to both sides thereof with pins 4c. Therefore, the lever 4b uses the pin 4c as a fulcrum to support the float chamber 1
It rotates up and down in c. As a result, the valve body 6 rotates together with the lever 4b in conjunction with the vertical movement of the float 4a and slides with respect to the valve seat 5 so that the valve seat 5 can be opened and closed. The valve body 6 is rotatably attached to the lever 4b about the axis in the sliding direction and the vertical direction on the seal surface 5b (see FIG. 8) of the valve seat 5. As shown in FIG. 7, when the valve body 6 closes the valve seat 5, the rotation center 6a of the valve body 6 and the center 5c of the opening 5a of the valve seat 5 may be designed to be displaced from each other. Therefore, the surface pressure of the sealing surfaces 5b and 6b generated by the fluid force becomes non-uniform,
The valve body 6 is easy to rotate.

As shown in FIG. 8, the seal surfaces 5b and 6b of the valve seat 5 and the valve body 6 are curved so as to project from the surroundings in the directions facing each other, and the circumferences are tapered. There is. As a result, as compared with the case where the seal surfaces 5b and 6b of the valve seat 5 and the valve body 6 have a simple flat shape, the actual valve seat area is reduced and the surface pressure of the valve seat 5 is increased to improve the valve closing performance. Can be increased. In addition, the taper shape reduces the amount of catching when opening and closing as compared with a simple flat shape, and thus has a characteristic that parts are less likely to be damaged.

As shown in FIG. 1, in the float type steam trap, the condensate that has flowed from steam-using equipment, steam piping, etc. (not shown) passes through the strainer 2 from the inlet 1d to the float chamber 1c. It enters and gradually accumulates in the float chamber 1c. The float 4 can move up and down inside the float chamber 1c. When the condensate is accumulated in the float chamber 1c to a predetermined amount, the float 4 rises due to buoyancy.

When buoyancy acts on the float 4, one end side of the lever 4b 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 of the valve seat 5.
Open a. As a result, the fluid accumulated in the float chamber 1c passes through the valve seat 5 and the flow path 3a of the holder 3 and the outlet 1
It is discharged from e. 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 so that the valve seat Close 5

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 sealing surfaces 5b, 6b increases as the fluid pressure increases, and the valve body 6 and the valve seat 5 are Since it slides and moves on a flat surface, it has excellent valve closing performance.

As described above, 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 device can be downsized, 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) causes a change in the area of interference between circles ( (Shown with diagonal lines). As shown in FIG. 10, the change in the opening area is much more gradual than that in the vertically moving valve seat or spherical valve seat. Therefore, it is possible to prevent the water hammer from being generated due to the sudden closing of the inner valve. In the open state,
Continuous drainage is possible even when the amount of condensate is small. Since the number of operations is reduced, it is possible to improve durability and extend the service life of parts.

Further, since the valve body 6 can be installed at a position immediately near the pin 4c which is the fulcrum of the lever 4b, the lever ratio (L1 / L2) is different from the conventional structure in which the valve seat 5 is installed outside the lever fulcrum. , See FIG. 1). For this reason, it is possible to cope with high-pressure use, and eventually to downsize the device.

The float 4a of the float 4 is a lever 4b.
Since the movement of the float 4 is restricted to the vertical rotation movement only, the float 4 is not affected even by disturbance such as vibration.
It is possible to prevent the float 4 from being damaged without causing a runaway. Since the lever 4b can be easily removed from the holder 3, it can be taken out from the main body 1 to facilitate maintenance.

The number of the valve seats 5 may be one or both sides of the side surface of the holder 3, and the number of the valve seats 5 may be freely changed depending on the required discharge amount. For this reason, by increasing the number of valve seats 5, the corresponding range of discharge performance can be widened, and 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 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, in the case where the valve seat 5 and the valve body 6 are plural, even if the operating angle of the float 4 is small, the opening area is large and
The discharge capacity can be increased.

Float type steam trap, 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. Therefore, the seal surfaces 5b and 6b are less likely to be damaged. Also, the valve seat 5
It has a self-cleaning action to remove scale adhering to, which has the effect of enhancing the valve closing performance, and can prolong the service life of parts.

After the float type steam trap is installed in the pipe, the cover 1b can be installed without removing the main body 1 from the pipe.
It is possible to take out the components in which the float 4, the valve body 6, the valve seat 5 and the holder 3 are integrated, to the outside in a lump by simply removing the holder from the body 1a, opening the main body 1 and removing the holder 3 from the main body 1. Therefore, the labor and cost of maintenance can be reduced.

[0044]

According to the float type steam trap of the present invention, the device can be downsized and the drainage capacity can be enhanced. Furthermore, since the valve body slides on the plane with respect to the valve seat, the valve closing performance is high, and since the opening area change of the valve is gentle, it prevents the occurrence of water hammer accompanying the sudden closing of the inner valve. be able to.

Particularly, according to the float type steam trap according to the present invention of claim 2, since the lever ratio (L1 / L2) can be made large, the device can be made smaller than the device having the same discharge capacity and the same working pressure. Can be achieved. Further, since the movement of the float is restricted to the movement of the vertical rotation movement by the lever, the float is not violent particularly due to disturbance such as vibration, and the damage of the float can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing a float type steam trap according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view of a modification of the float steam trap of FIG. 1, corresponding to the cross-sectional view taken along the line II-II of FIG.

4 is a cross-sectional view of another modified example of the float steam trap of FIG. 1, corresponding to the cross-sectional view taken along the line II-II of FIG.

5 is a sectional view of still another modified example of the float steam trap of FIG. 1, corresponding to the sectional view taken along the line II-II of FIG.

6 (A) is an explanatory view showing a modified example of the float type steam trap of FIG. 1 with a plurality of valve seats attached, and FIG. 6 (B) is a sectional view corresponding to the sectional view taken along the line II-II in FIG. .

FIG. 7 is an explanatory diagram showing a shift of centers of a valve body and a valve seat of the float type steam trap of FIG.

8 is an enlarged cross-sectional view of a main part showing a valve body and a valve seat of the float type steam trap of FIG.

FIG. 9 is an explanatory diagram showing a change in the opening area of the valve seat of the float steam trap of FIG.

10 is a graph showing a change in the opening area of the valve seat of the float steam trap of FIG.

FIG. 11 is a sectional view showing a conventional float type steam trap.

FIG. 12 is a sectional view showing another conventional float type steam trap.

[Explanation of symbols]

1 body 1a body 1b cover 1c float room 1d inlet 1e Outlet 2 strainers 3 holder 4 floats 4a floating 4b lever 5 seat 6 valve body

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-2-300598 (JP, A) JP-A-2-17280 (JP, A) JP-A-2001-132894 (JP, A) JP-B-48-4332 (JP, B1) JP-B 48-37285 (JP, B1) JP-B 49-23925 (JP, B1) JP-B 50-40034 (JP, Y2) JP-B 51-36267 (JP-Y1) JP KO 48-40175 (JP, Y1) KO 9-10110 (JP, Y1) KO 56-30784 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16T 1 / 00-1/48 F16K 31/18-31/34 F16K 3/00

Claims (6)

(57) [Claims] 1. A main body having a float chamber, having an inflow port and an outflow port communicating with the float chamber, a float provided inside the float chamber so as to be movable up and down, and inside the float chamber. A valve seat communicating with the outflow port; and a valve body provided on the float so as to open and close the valve seat by sliding with respect to the valve seat in conjunction with vertical movement of the float. The float type steam trap, wherein the sealing surfaces of the valve body are curved surfaces projecting from the surroundings in directions opposite to each other and the surroundings are tapered. 2. A holder is further provided, the holder having a flow passage communicating with the outflow port therein, is fixed to the main body inside the float chamber, and the valve seat communicates with the flow passage. The float has a float and a lever, the valve body is provided on the lever, one end of the lever is fixed to the float, and the valve body is interlocked with the vertical movement of the float. The float type steam trap according to claim 1, wherein 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. 3. The holder has a plurality of valve seats on one side, a plurality of the valve bodies are provided on the levers corresponding to the respective valve seats, and the levers move the valve bodies up and down of the float. The float type steam trap according to claim 2, wherein the holder is rotatably provided on the other end side so as to open and close each valve seat by slidingly interlocking with each valve seat. 4. The valve body is rotatably provided on the float about an axis perpendicular to the sliding direction, and when the valve body closes the valve seat, the center of rotation of the valve body and the opening of the valve seat. 4. The float type steam trap according to claim 1, wherein the centers of the floats are displaced from each other. 5. The float type steam trap according to claim 1, wherein the float type steam trap has a plug that can be easily replaced with the valve seat. 6. The float type steam trap according to claim 2, 3, 4, or 5, wherein the main body is openable and closable, and the holder is detachably fixed to the main body.