JP3761985B2 - Temperature control trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a temperature control trap that is provided on the downstream side of a steam pipe and is opened when the condensate is at a predetermined temperature or less to discharge the condensate to the outside.
[0002]
[Prior art]
Conventionally, this type of temperature control trap is fitted into a valve rod having a valve seat member, a valve body that opens and closes a passage between the valve seat surface of the valve seat member, and the valve rod. A bimetal column that is a temperature-sensitive driving body is provided. When the condensate temperature is higher than the predetermined temperature, the valve rod is moved in the valve closing direction by the thermal expansion of the bimetal column, and the valve seat is closed by the valve body to prevent the external discharge of the condensate above the predetermined temperature. In addition, when the condensate falls below a predetermined temperature, the thermal expansion force of the bimetal column declines, so that the valve stem is moved in the valve opening direction to open the valve seat surface. To the outside.
[0003]
In addition, an adjustment screw capable of controlling the amount of deformation during thermal expansion of the bimetal column is provided inside the body, and before the temperature control trap is attached to the steam pipe, the adjustment screw is screwed to operate the bimetal column. The drainage temperature can be arbitrarily adjusted by appropriately setting (initial setting) the valve closing temperature due to the thermal expansion of.
[0004]
[Problems to be solved by the invention]
However, in the conventional temperature control trap, since the adjustment screw of the bimetal column is incorporated in the body, the drainage temperature cannot be adjusted from the outside of the body after the initial setting.
[0005]
Therefore, an object of the present invention is to make it possible to easily adjust the drainage temperature from the outside of the body at any time.
[0006]
[Means for Solving the Problems]
The configuration of the present invention for achieving the above object will be described with reference to FIG. 1 showing an embodiment. The temperature control trap of the present invention is attached to the valve stem 4, the valve stem 4 having the valve body 41 at one end, the support flange 51 at one end, and the sleeve 5 fitted on the outer periphery of the valve stem 4. A spring receiving member 6, a temperature-sensitive driving body 7 that is fitted on the outer periphery of the sleeve 5, has one end supported by the support flange 51, and generates a driving force in the valve closing direction of the valve stem 4 by thermal expansion. A compression spring 8 fitted into the outer periphery of the sleeve 5 with one end facing the other end of the temperature-sensitive driver 7 and the other end facing the spring receiving member 6 ; the operation from the outside of the temperature control trap is characterized in that relative to the valve stem 4 with an adjusting member 9 for moving the sleeve 5 in the axial direction.
[0007]
According to the above temperature control trap, when the condensate temperature is equal to or higher than a predetermined temperature, the temperature-sensitive drive body 7 fitted on the outer periphery of the sleeve 5 is thermally expanded, and the compression spring 8 is compressed accordingly, The valve stem 4 moves in the valve closing direction along the sleeve 5 via the spring receiving member 6, and the valve body 41 of the valve stem 4 is pressed against the valve seat surface of the valve seat member to be in a valve-closed state. To prevent external discharge of water. Condensate falls below a predetermined temperature, the thermal expansion force of the temperature-sensitive driver 7 decreases, and the compression spring 8 expands accordingly, thereby reducing the pressing force in the valve closing direction with respect to the valve rod 4. In response to the force to move the valve stem 4 in the valve closing direction by the temperature-sensitive drive body 7 and the compression spring 8, the valve stem 4 is caused by the condensate pressure in the body 1 acting on the valve rod 4 and the valve body 41. When the force to move in the valve opening direction is overcome, the valve rod 4 moves in the valve opening direction and is separated from the valve seat surface to be in the valve open state, and condensate having a predetermined temperature or less is discharged to the outside. .
[0008]
Further, the adjusting member 9 is adjusted to move the sleeve 5 in the axial direction, and the deformation amount at the time of thermal expansion of the temperature-sensitive driving body 7 interposed between the flange 51 provided on one end side thereof and the compression spring 8 is adjusted. Then, the drainage temperature is arbitrarily adjusted by appropriately setting the valve closing temperature due to the thermal expansion of the temperature sensitive driving body 7. At this time, since the adjusting member 9 is operated from the outside of the temperature control trap, the drainage temperature can be easily adjusted. Further, the initial temperature of the valve stem 4, that is, the start temperature of the valve opening operation is set by the temperature-sensitive driver 7 and the compression spring 8, so that the valve stem is substantially parallel to the saturation temperature line. 4 can be adjusted.
[0009]
In the embodiment of the present invention, a stopper sleeve 10 is provided between the sleeve 5 and the compression spring 8. According to this configuration, when the compression spring 8 is compressed by the thermal expansion of the temperature-sensitive drive body 7, the temperature-sensitive drive body 7 comes into contact with the stopper sleeve 10 to prevent excessive compression of the compression spring 8. Thereby, damage to the compression spring 8 can be prevented and durability is increased.
[0010]
Further, in another embodiment of the present invention, the adjustment member 9 is screw-connected to the cover 2 provided on the body 1 of the temperature control trap. According to this configuration, the drainage temperature can be easily adjusted by screwing the adjusting member 9 from the outside of the cover 2.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
The temperature control trap shown in FIG. 1 includes a body 1 having an inflow port 1a and a discharge port 1b on both the left and right sides, and a cover 2 that is detachably screwed to an upper opening of the body 1. Inside the body 1, a valve seat member 3 screwed to the bottom thereof, and the valve seat member 3 are inserted vertically, and a valve seat surface 31 formed on the valve seat member 3 on the lower end side thereof. And a valve rod 4 provided with a valve body 41 for opening and closing the passage between the two.
[0012]
The valve seat member 3 is provided with an insertion hole 32 through which the valve rod 4 is inserted on the upper side, and a communication passage 33 is formed on the lower side to communicate the inside of the body 1 with the outlet 1b. As shown in FIG. 2, the communication path 33 includes a first hole 33 a that extends in a vertical direction larger than the insertion hole 32, and a second hole 33 b that extends in the radial direction from the top of the first hole 33 a. A plurality of third holes 33c that are radially connected to the lower portion of the first hole 33a and that always open to the discharge port 1b side are provided. A valve seat surface 31 is formed at a lower portion of the first hole 33a, that is, a connecting portion with the third hole 33c. The valve seat surface 31 is a tapered surface having a large diameter on the lower side and a small diameter on the upper side.
[0013]
As shown in FIG. 3, the valve body 41 of the valve stem 4 is formed with a tapered surface 41 a that is pressed against the valve seat surface 31. Further, a pin hole 42 penetrating in the radial direction is provided on the upper side of the valve stem 4, and the first pin 43 of FIG. 1 is inserted into the pin hole 42, and both ends of the inserted first pin 43 are inserted. The portion supports a spring receiving member 6 of a compression spring 8 made of a washer or the like.
[0014]
Further, a sleeve 5 that is movable relative to the valve stem 4 in the axial direction is fitted on the outer periphery of the valve stem 4. As shown in FIG. 4, the sleeve 5 is integrally formed with a support flange 51 on the lower end side, and a first pin 42 inserted through the valve stem 4 is inserted on the upper side to connect the valve stem 4 and the sleeve 5. Two slits 52 that allow relative movement are provided, and a pin hole 54 through which a second pin 53 for connecting an adjusting member 9 and a sleeve 5 described later is inserted at a position orthogonal to each slit 52. Form.
[0015]
As shown in FIG. 1, a temperature sensitive driving body 7 such as a bimetal column in which a plurality of bimetals are superposed is fitted on the outer periphery of the sleeve 5 so as to be movable up and down. The bimetal column 7 is composed of a high expansion member 71 made of Cu or the like and a low expansion member 72 made of Ni or the like that are superposed so that the high expansion member 71 is located on the outside and the low expansion member 72 is located on the inside. As a set, the two sets of two pieces are fitted into the sleeve 5, and one end (lower end) of the bimetal column 7 is supported by the flange 51 at the lower end of the sleeve 5.
[0016]
Further, a compression spring 8 made of a coil spring is interposed between the spring receiving member 6 and the other end (upper end) of the temperature-sensitive drive body 7 around the outer periphery of the sleeve 5.
[0017]
Further, the cover 2 is provided with an adjustment member 9 capable of controlling the amount of deformation of the temperature-sensitive driver 7 during thermal expansion by moving the sleeve 5 up and down. As shown in FIG. 5, the adjustment member 9 is composed of a shaft body 91 having a blind hole portion 90 in the lower inside, and a screw hole 21 (provided at the center of the cover 2 on the upper side of the shaft body 91 ( 1), an upper end surface is provided with an operation groove 93 for screwing the shaft body 91 by inserting a screwdriver or the like from the outside of the cover 2, and a lower side of the shaft body 91. Are formed with a plurality of through holes 94 extending through the blind hole portion 90 in the radial direction. Then, by inserting the upper side of the sleeve 5 into the blind hole portion 90 and press-fitting the second pin 53 inserted into the pin hole 54 of the sleeve 5 into the through hole 94, the second pin 53 is inserted through the second pin 53. The shaft body 91 and the sleeve 5 are connected.
[0018]
1 is compressed between the spring receiving member 6 and the upper end portion of the temperature-sensitive drive body 7 due to the thermal expansion of the temperature-sensitive drive body 7 at an intermediate portion between the sleeve 5 and the compression spring 8 shown in FIG. When the spring 8 is compressed between the temperature-sensitive driving body 7 and the spring receiving member 6, a stopper sleeve 10 is provided that contacts the upper end of the temperature-sensitive driving body 7 and prevents excessive compression of the compression spring 8. To do. Reference numeral 95 denotes a seal member provided between the adjustment member 9 and the cover 2.
[0019]
Next, the operation of the temperature control trap having the above configuration will be described. When the temperature of the condensate flowing into the body 1 from the inflow port 1a is equal to or higher than a predetermined temperature, as shown in FIG. 1, each thermal expansion element (each bimetal set) of the temperature-sensitive driver 7 is thermally expanded and vertically moved. By deforming into a curved shape, the compression spring 8 is compressed between the temperature-sensitive drive body 7 and the spring receiving member 6, and the spring receiving member 6 is pushed upward, and accordingly, the first pin 43. As the valve rod 4 moves upward along the slits 52 of the sleeve 5, the valve stem 4 moves upward in the valve closing direction with respect to the sleeve 5, and the valve element 41 at the tip of the valve stem 4 moves to the valve of the valve seat member 3. The valve is closed against the seat surface 31 to prevent the condensate from being discharged from the discharge port 1b.
[0020]
When the condensate in the body 1 falls below a predetermined temperature from the above state, the thermal expansion force of the temperature-sensitive drive body 7 is lowered, and the compression spring 8 is extended along with this, so that the valve closing direction with respect to the valve stem 4 is closed. The pressing force to the is reduced. The body acting on the top surface of the valve stem 4 and the tapered contact surface of the valve body 41 against the force to move the valve stem 4 in the valve closing direction by the temperature sensitive drive body 7 and the compression spring 8. When the force to move the valve stem 4 in the downward valve opening direction is overcome by the condensate pressure or the dead weight in the valve 1, the valve rod 4 moves in the valve opening direction and separates from the valve seat surface 31. As a result, the condensate having a predetermined temperature or lower is discharged from the discharge port 1b to the outside through the communication path 33.
[0021]
In the embodiment of FIG. 1, the valve seat surface 31 of the valve seat member 3 is formed on the discharge port 1 b side, and the valve body 41 that opens and closes the valve seat surface 31 is also a so-called circumscribed type arranged on the discharge port 1 b side. When the temperature-sensitive drive body 7 does not exhibit sufficient thermal expansion force due to malfunction, the valve body 41 is held open by the condensate pressure in the body 1, so that steam and condensate can be prevented. Can be discharged to the outside. Therefore, there is no possibility that the condensate stays upstream and adversely affects the steam equipment.
[0022]
Further, when changing the drainage temperature of the condensate discharged from the outlet 1b, a screwdriver or the like is inserted from the outside into the operation groove 93 provided on the upper end surface of the shaft body 91 of the adjusting member 9 attached to the cover 2. The body 91 is screwed. Then, the sleeve 5 moves in the vertical direction along the valve stem 4 via the second pin 53, and accordingly, the dimension between the support flange 51 and the compression spring 8, that is, the storage space of the temperature-sensitive drive body 7. The axial length is adjusted. With such adjustment, the valve rod 4 is moved by the temperature-sensitive drive body 7 and the compression spring 8 against the force that moves the valve rod 4 in the valve opening direction due to the condensate pressure in the body 1 acting on the valve body 41. The force for moving the valve 4 in the valve closing direction is adjusted to set the initial temperature when the valve rod 4 is moved in the valve opening direction. Therefore, the initial temperature, that is, the drainage temperature can be easily set by an operation from the outside of the body.
[0023]
In addition, when blow-off is performed to discharge dust and the like remaining in the body 1 to the outside, the shaft 91 is operated from the outside of the cover 2 to open the valve, thereby easily discharging dust and the like to the outside. It can also be done. Further, since the contact surfaces of the valve seat surface 31 and the valve body 41 are both tapered surfaces, the valve body 41 is automatically held at the center of the valve seat surface 31 and the opening / closing operation by the valve body 41 is stable. It becomes.
[0024]
In addition, by setting the initial temperature of the valve body 41 with the temperature-sensitive drive body 7 and the compression spring 8, a drain temperature line that is substantially parallel to the saturation temperature line can be obtained. This will be described next.
[0025]
6 corresponds to the saturation temperature line A in which the vertical axis represents temperature (° C.) and the horizontal axis represents absolute pressure (Kg · f / cm ² ), and the initial opening temperature set by the adjusting member 9. Drain temperature lines B to F are shown. As shown in FIG. 7, these drain temperature lines B to F have a stroke from the upper end of the temperature-sensitive drive body 7 to the lower end of the compression spring 8 in the contracted state of the temperature-sensitive drive body 7 as S1. The stroke from the upper end of the driving body 7 to the lower end of the stopper sleeve 10 is S2, and the strokes S1 and S2 are experimentally obtained by changing the sleeve 5 by the adjustment member 9 by the vertical movement of the sleeve 5. Here, S1 and S2 are set to be smaller in the order of line B → C → D → E → F. In addition, in the same figure, the drainage temperature line G when the initial temperature of the valve rod is set only by the temperature sensitive driving body 7 without using the compression spring 8 is shown as a reference.
[0026]
As is clear from FIG. 6, the saturation temperature line A shows a relatively steep increase with respect to the pressure increase in the range of the absolute pressure of 1 to 5 kg · f / cm ² , and the absolute pressure of 5 to 11 kg · f / cm ^2. In the range of cm ^2, the rise is moderate. On the other hand, in the case of the drainage temperature line G without a compression spring, the temperature rises linearly with a rising slope as the pressure rises. For this reason, the temperature difference between the saturation temperature line A and the drainage temperature line G due to pressure fluctuations. Changes significantly.
[0027]
On the other hand, in the case of each drainage temperature line B to F, the temperature is low in a low pressure state where the absolute pressure is 1 to 5 kg · f / cm ² , and the driving force of both the temperature-sensitive driving body 7 and the compression spring 8 is connected to the series spring. Since the valve closing driving force weakened as follows, it becomes difficult to close the valve, so that each drain temperature line B to F shows a relatively steep rise with respect to the pressure rise, and the absolute pressure in the saturation temperature line A It becomes almost parallel to the range of 1 to 5 kg · f / cm ² . Further, in a high pressure state of 5 to 11 kg · f / cm ² in absolute pressure, the temperature becomes high, and the temperature-sensitive drive body 7 expands greatly and the compression spring 8 is completely compressed, so that the spring force is not exerted, that is, compression. Since the initial state of the temperature of the valve stem 4 is set only by the temperature-sensitive drive body 7, the drain temperature lines B to F rise gradually with respect to the pressure rise, and the saturation temperature line A It becomes almost parallel to the absolute pressure range of 5 to 11 kg · f / cm ² . Therefore, this can be satisfied when there is a request to discharge the condensate which is lower than the saturation temperature by a certain temperature regardless of the pressure level.
[0028]
In the second embodiment shown in FIG. 8, a flat valve seat surface 31 is provided on the lower side of the communication passage 33 in the valve seat member 3, and the upper surface side of the valve body 41 seated on the valve seat surface 31 is defined as a flat surface 41b. Yes. According to this configuration, when the valve stem 4 moves down and the valve seat 41 is opened by the valve body 41, the passage rapidly expands with a small amount of movement of the valve stem 4, so that a large amount of condensate is externally applied at once. Can be discharged. At this time, although the valve seat surface 31 is flat and the flat surface 41b is formed on the upper surface side of the valve body 41 seated on the valve seat surface 31, the condensate from the communication passage 33 is Since it is discharged through the plurality of third holes 33c provided in a radial manner while going around the periphery of the valve body 41, the valve body 41 can be held at the center of the valve seat surface 31, and the opening / closing operation by the valve body 41 is stabilized. Is done.
[0029]
【The invention's effect】
As described above, according to the present invention, the adjustment member that sets the initial temperature when the valve stem 4 moves in the valve opening direction can be operated from the outside of the temperature control trap. Can be easily performed. Moreover, since the initial temperature of the valve stem is set by the temperature-sensitive drive body and the compression spring, the initial temperature of the valve stem 4 can be adjusted so as to be substantially parallel to the saturation temperature line.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a temperature control trap according to an embodiment of the present invention.
FIG. 2 is a side sectional view of a valve seat member.
FIG. 3 is a front view of the valve stem partially cut away.
FIG. 4 is a longitudinal side view of a sleeve.
FIG. 5 is a vertical side view of the adjustment member.
FIG. 6 is a graph showing a saturation temperature line and a drain temperature line.
FIG. 7 is an explanatory diagram when creating the graph.
FIG. 8 is a side sectional view showing another embodiment of the valve seat member and the valve body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Cover, 4 ... Valve rod, 41 ... Valve body, 5 ... Sleeve, 51 ... Support flange, 6 ... Spring receiving member, 7 ... Temperature-sensitive drive body, 8 ... Compression spring, 9 ... Adjustment member

Claims (3)

A valve stem 4 having a valve body 41 at one end;
A sleeve 5 having a support flange 51 at one end and fitted on the outer periphery of the valve stem 4;
A spring receiving member 6 attached to the valve stem 4;
A temperature-sensitive drive body 7 fitted into the outer periphery of the sleeve 5 and supported at one end by the support flange 51 to generate a driving force in the valve closing direction of the valve rod 4 by thermal expansion;
In a temperature control trap that is fitted to the outer periphery of the sleeve 5 and has a compression spring 8 having one end facing the other end of the temperature-sensitive driver 7 and the other end facing the spring receiving member 6 .
A temperature control trap comprising an adjusting member 9 for moving the sleeve 5 in the axial direction with respect to the valve stem 4 by an operation from the outside of the temperature control trap.   In Claim 1, when the compression spring 8 is compressed between the sleeve 5 and the compression spring 8 by the thermally-expanded temperature-sensitive drive body 7, it is compressed by abutting against the other end portion of the temperature-sensitive drive body 7. A temperature control trap equipped with a stopper sleeve 10 that prevents excessive compression of the spring 8.   The temperature control trap according to claim 1 or 2, wherein the adjustment member (9) passes through a cover (2) that is freely attached to and detached from the body (1) of the temperature control trap and is screwed to the cover (2).

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