Liquid force feed device

Abstract

To provide a liquid force feed device capable of reliably closing a valve mechanism which introduces high pressure gas.SOLUTION: A drain force feed device is connected to a piping system for inputting drain collected through a pipe into the device and automatically force-feeding it from time to time. An air supply valve 18 is an automatic valve for introducing force-feeding high pressure steam. An air supply valve element 21 for opening / closing the air supply valve 18 is moved up and down while being guided by a cylindrical screen 60. The cylindrical screen 60 is fixed and mounted directly to a valve case 20 formed with an air supply valve port 24 to prevent positional deviation from the air supply valve port 24. Two bent pieces 65 are provided as stoppers at the upper end of the cylindrical screen 60 to prevent the separation of the air supply valve element 21 and also prevent the collision of the air supply valve element 21 with a cap 26 or a lid 8.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The liquid pumping device according to the present application relates to the configuration of a device that pumps a liquid taken in from the outside by introducing a high-pressure gas.

Background Art

[0002] As a liquid pumping device, there is a device disclosed in Patent Document 1 below. The liquid pumping device 1 according to Patent Document 1 is connected to a pipe, temporarily takes in the drain generated by various steam-using devices, and is then used to pump the taken-in drain to a boiler or a waste heat utilization location.

[0003] A liquid inlet 16 and a liquid outlet 17 that communicate with the liquid storage space 10 are formed in the lid portion 8 attached to the main body portion 7. Drain flows in from the liquid inlet 16 through a pipe, and the drain is stored in the liquid storage space 10. A float 3 is disposed in the liquid storage space 10 so as to be floating, and this float 3 is fixed to the tip of the float arm 34 of the snap mechanism 5.

[0004] In addition, an operating fluid inlet 11 and an operating fluid outlet 13 into which high-pressure steam is introduced are formed above the lid portion 8. The steam inlet 11 opens and closes according to the operation of the air supply valve 18, and the steam outlet 13 opens and closes according to the operation of the exhaust valve 19. The air supply valve 18 and the exhaust valve 19 constitute a switching valve 4. When the air supply valve 18 opens, the exhaust valve 19 closes, and when the air supply valve 18 closes, the exhaust valve 19 opens.

[0005] When the drain accumulates in the liquid storage space 10, the float 3 floats, and this floating is transmitted to the air supply valve 18 and the exhaust valve 19 by the link action of the snap mechanism 5. When the air supply valve 18 opens, the exhaust valve 19 closes at the same time. As a result, high-pressure steam flows into the liquid storage space 10 from the operating fluid inlet 11, and the drain staying in the liquid storage space 10 is pushed out from the liquid outlet 17 under the steam pressure and pumped to a boiler or a waste heat utilization location.

[0006] In the valve case 20 of the air supply valve 18, a through-hole communicating with the working fluid inlet 11 is formed axially. The air supply valve port 24 located at the upper part of the through-hole is opened and closed by the vertical movement of the air supply valve body 21. An opening 25 is formed in the approximate center of the valve case 20 in four directions, and the opening 25 communicates with the axial through-hole. The air supply valve body 21 is arranged in the cylindrical filter 23 and moves vertically guided by the inner surface of the cylindrical filter 23.

[0007] Above the air supply valve 18, a cap 26 is screwed and attached to the lid portion 8. And a cylindrical filter 23 is arranged between the cap 26 and the air supply valve port 24 at the upper part of the valve case 20. The cylindrical filter 23 is fixed by being fitted into the protruding portion on the lower surface of the cap 26. The cylindrical filter 23 allows the high-pressure steam introduced from the working fluid inlet 11 to pass through. This high-pressure steam passes through the through-hole from the air supply valve port 24, jets out from the opening 25 toward the liquid storage space 10, puts the liquid storage space 10 in a high-pressure state, and pumps the drain from the liquid discharge port 17.

[0008] A lower lifting rod 22 is integrally fixed to the air supply valve body 21 by welding. And when the lower end of this lower lifting rod 22 is pushed up by the connecting plate 27 provided on the valve shaft operating rod 28, the air supply valve body 21 is guided by the inner surface of the cylindrical filter 23 and moves upward, and the air supply valve 18 opens.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0010] In the liquid pumping device 1 disclosed in the aforementioned Patent Document 1, when the air supply valve 18 opens, the high-pressure steam introduced from the working fluid inlet 11 passes through the cylindrical filter 23 and vigorously passes through the lower surface of the cap 26.

[0011] If erosion (mechanical wear) occurs on the protruding portion of the lower surface of the cap 26, it may affect the cylindrical filter 23 that is fitted and fixed to the protruding portion of the cap 26. For example, it is conceivable that the lower end of the cylindrical filter 23 affected by the steam pressure is deformed and enters the air supply valve port 24. If the lower end of the cylindrical filter 23 enters the air supply valve port 24, even if the air supply valve body 21 descends, it may not be able to close the air supply valve port 24, and there is a risk that it will be difficult to close the air supply valve 18.

[0012] In addition, since the air supply valve body 21 repeatedly moves up and down to open and close the air supply valve 18, if the air supply valve body 21 repeatedly collides with the cap 26 forcefully, the air supply valve body 21 may wear and deform. In particular, when the cylindrical filter 23 is wobbling, if the air supply valve body 21 rises and repeatedly collides violently with the cap 26, there is a risk of uneven wear on the spherical air supply valve body 21.

[0013] Such deformation of the air supply valve body 21 may cause the air supply valve body 21 to rotate when reciprocating up and down. When the air supply valve body 21 rotates, it may impact the mesh of the cylindrical filter 23, and the mesh may be damaged and debris may adhere to the portion of the air supply valve port 24, which may prevent the closing of the air supply valve port 24.

[0014] Therefore, the liquid pumping device according to the present application aims to provide a liquid pumping device that can surely close the valve mechanism for introducing high-pressure gas.

Means for Solving the Problems

[0015] The liquid pumping device according to the present application is A main body portion having a target liquid inlet portion into which a target liquid flows, a valve chamber portion for storing the introduced target liquid, a target liquid outlet portion from which the stored target liquid flows out, and an operating gas introduction portion for introducing a high-pressure operating gas. A responsive portion whose state changes according to the storage amount of the target liquid stored in the valve chamber portion. An operating valve portion that closes or opens according to the change in the state of the responsive portion. When the valve is opened, the high-pressure operating gas is introduced into the valve chamber portion, so that the target liquid stored in the valve chamber portion flows out from the target liquid outlet portion and is pressure-fed. In a liquid pressure feeding device provided with the above. The operating valve portion is An operating valve body A valve body portion provided on the operating valve body so as to be reciprocally movable in the reference axis direction. The valve body portion reciprocates according to the change in the state of the responsive portion, and closes or opens the flow path of the operating gas from the operating gas introduction portion toward the valve chamber portion. A guide portion that is arranged such that the guide center axis coincides with the reference axis, holds the valve body portion reciprocally movably inside, and allows the operating gas to permeate. The guide portion is connected to the operating valve body by connecting means, contacts the valve body portion to restrict the reciprocating movement of the valve body portion, and has restricting means for avoiding contact between the valve body portion and the main body portion. It is provided with the above. It is characterized by the above.

Effect of the Invention

[0016] In the liquid pressure feeding device according to the present application, the guide portion provided in the operating valve portion is connected to the operating valve body by connecting means. Therefore, it is possible to prevent the guide portion from wobbling, and the valve body portion reciprocating inside the guide portion can surely block the flow path of the operating gas toward the valve chamber portion. Therefore, the operating valve portion for introducing the high-pressure operating gas can be surely closed.

[0017] Further, the guide portion has a regulating means that contacts the valve body portion to regulate the reciprocating movement of the valve body portion and avoid contact between the valve body portion and the main body portion. Therefore, deformation of the valve body portion due to collision with the main body portion can be prevented, and rotation of the valve body portion during reciprocating movement can be suppressed. As a result, wear around the flow path of the operating gas and damage to the guide portion can be avoided, and the flow path of the operating gas can be reliably blocked. Therefore, the operating valve portion for introducing high-pressure operating gas can be reliably closed.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0019] [Term Explanation in Embodiment] The main terms shown in the embodiment respectively correspond to the following elements of the liquid pumping device according to the present application.

[0020] Drain pumping device 1... Liquid pumping device Float 3... Reaction part Body 7 and lid 8... Main body part Valve chamber space 10... Valve chamber part Steam inlet 11... Operating gas introduction part Drain inlet 16... Target liquid inlet Drain outlet 17... Target liquid outlet Air supply valve 18... Actuating valve part Valve case 20... Actuating valve body Air supply valve body 21... Valve body part Insertion space 23a, locking space 23b and locking projection 68... Connecting means Cylindrical screens 60, 70... Guide part Bending piece 65, stopper plate 75... Restricting means Center line 80... Reference axis, guide center axis Drain... Target liquid Steam... Actuating gas

[0021] [First Embodiment] The first embodiment of the liquid pumping device according to the present application will be described. In this embodiment, the drain pumping device 1 is taken as an example of the liquid pumping device. In an industrial plant, a piping system for transferring steam generated by a boiler to various devices may be installed. The steam in the piping condenses due to heat dissipation during transfer and use in various devices, generating drain (condensed water).

[0022] The drain is automatically discharged by the operation of steam traps installed at various locations in the piping system and recovered through a recovery pipe. The drain pumping device 1 in this embodiment is connected to this drain recovery pipe. Then, the drain recovered through the drain recovery pipe is once taken into the device, and the taken-in drain is automatically pumped appropriately toward a boiler or a waste heat utilization location using the steam pressure.

[0023] (Overall configuration of the drain pumping device 1) First, the overall configuration of the drain pumping device 1 will be described with reference to FIG. 1. The drain pumping device 1 forms a main body by screwing together a body 7 and a lid 8 (not shown), and forms an airtight valve chamber space 10 inside. In the valve chamber space 10, a float 3, a link mechanism 5, and an air supply valve 18 are provided. The link mechanism 5 is a transmission mechanism for transmitting the floating of the float 3 to the air supply valve 18. In FIG. 1, each member of the link mechanism 5 is shown schematically rather than in cross-section for convenience of explanation.

[0024] The lid 8 is formed with a steam inlet 11, a drain inlet 16, and a drain outlet 17. An external pipe (not shown) connected to a high-pressure steam source is connected to the steam inlet 11, and high-pressure steam flows in from the steam inlet 11. The steam passes through a filter (not shown) provided in the external pipe, and after the foreign matter mixed in the steam is removed, it is supplied to the steam inlet 11.

[0025] A drain recovery pipe (not shown) is connected to the drain inlet 16, and the drain that has passed through a check valve (not shown) flows into the valve chamber space 10 from the drain inlet 16. Also, a transfer pipe (not shown) is connected to the drain outlet 17, and the drain is pumped through the transfer pipe to a pumping destination such as a boiler. An air supply valve 18 is attached inside the steam inlet 11 to open and close the flow path of the high-pressure steam.

[0026] As shown in FIG. 2, the air supply valve 18 includes a valve case 20, a cylindrical screen 60, an air supply valve body 21, and a lifting rod 22. The valve case 20 has a through hole 29 formed along a center line 80, and the upper opening of the through hole 29 is configured as an air supply valve port 24. The lower end of the through hole 29 opens toward the valve chamber space 10. The upper part of the through hole 29 continuous with the air supply valve port 24 is formed with its inner diameter smaller than that of the lower part.

[0027] The cover 8 is formed with an intervening space 19 communicating with the steam inlet 11. And, facing this intervening space 19, the valve case 20 is screwed to the cover 8 via a screw mechanism. That is, a high-pressure steam flow path leading to the valve chamber space 10 is formed by the steam inlet 11, the intervening space 19, the air supply valve port 24, and the through hole 29. Note that a cap 26 is screwed and attached to a through hole formed in the cover 8 at the upper part of the intervening space 19.

[0028] Inside the intervening space 19, a cylindrical screen 60 connected and fixed to the valve case 20 is arranged. And, an air supply valve body 21 is provided inside this cylindrical screen 60. The air supply valve body 21 is a steel ball having a spherical shape and is positioned above the air supply valve port 24. The diameter of the air supply valve body 21 is slightly smaller than the inner diameter of the cylindrical screen 60, and the air supply valve body 21 is guided by the cylindrical screen 60 and is arranged to be reciprocally movable in the vertical direction (the directions of arrows 91 and 92).

[0029] Inside the through hole 29 formed in the valve case 20, a lifting rod 22 is arranged. As shown in B of FIG. 3, the outer peripheral surface of this lifting rod 22 constitutes a columnar curved surface so as to follow the inner peripheral curved surface of the through hole, and the width 51 is slightly smaller than the inner diameter of the through hole 29. On the other hand, the thickness 52 of the lifting rod 22 is sufficiently smaller than the inner diameter of the through hole 29, and the thickness surfaces 55 on both sides are configured as flat surfaces. For this reason, a sufficient space is secured between the thickness surface 55 of the lifting rod 22 and the inner surface of the through hole 29, and this space is configured as a high-pressure steam flow path.

[0030] The lifting rod 22 is movable vertically within the through hole 29. The tip 22b of the lifting rod 22 is formed as a thin cylindrical bar. When the lifting rod 22 ascends in the direction of arrow 91, the tip surface of the tip 22b protrudes from the air supply valve port 24 toward the intervening space 19 side, and is configured to push up the air supply valve body 21. A transmission shaft 22a protruding laterally is provided at the lower end of the lifting rod 22, and this transmission shaft 22a is connected to the link mechanism 5. The central axes of the cap 26, the intervening space 19, and the air supply valve 18 (cylindrical screen 60, air supply valve body 21, through hole 29, and lifting rod 22) are arranged to coincide with the center line 80. In FIG. 1, the lifting rod 22 is shown as a side view rather than a cross section.

[0031] FIG. 4 is a perspective view of the cylindrical screen 60. The cylindrical screen 60 has an upper end frame 61 and a lower end frame 62 in the shape of a cylindrical ring, and a cylindrical mesh portion 63 is integrally fixed between the upper end frame 61 and the lower end frame 62. Two locking protrusions 68 are fixed to the outer periphery of the bottom of the lower end frame 62. The two locking protrusions 68 are provided at positions symmetric about the center line 80 twice and are arranged along a straight line in the diameter direction.

[0032] FIG. 5 is a plan view of the valve case 20 of the air supply valve 18. A circular recess 23 is formed around the air supply valve port 24 on the upper surface of the valve case 20. The inner diameter of the recess 23 is slightly larger than the outer diameter of the lower end frame 62 of the cylindrical screen 60. Two insertion spaces 23a are formed on the inner wall of the recess 23 facing outward. The two insertion spaces 23a are provided at positions symmetric about the center line 80 twice and are arranged along a straight line in the diameter direction. This insertion space 23a has a shape and size corresponding to the locking protrusion 68 formed on the lower end frame 62 of the cylindrical screen 60, and the locking protrusion 68 can be inserted from above due to its upward opening.

[0033] Furthermore, in each of the two insertion spaces 23a, a locking space 23b is formed in a communicating state in the clockwise direction (arrow 95 direction) in the figure. The locking space 23b is a space formed toward the inside of the inner wall of the recess 23, communicates with the recess 23, but is not open to the upper surface of the valve case 20.

[0034] When mounting the cylindrical screen 60 to the valve case 20, while fitting the lower end of the cylindrical screen 60 into the recess 23 of the valve case 20, the locking protrusion 68 on the cylindrical screen 60 side is inserted into the insertion space 23a of the valve case 20. Then, the cylindrical screen 60 is rotated in the direction of arrow 95, and the locking protrusion 68 is slid and fitted into the locking space 23b. Thereby, the cylindrical screen 60 is attached in a fixed state with respect to the valve case 20.

[0035] In addition, as shown in FIGS. 2, 3A, and 4, two bending pieces 65 are provided on the upper end frame 61 of the cylindrical screen 60. The bending pieces 65 are continuously formed on the upper end frame 61, and are disposed at the upper end of the cylindrical screen 60 by bending the bending pieces 65 inward by about 90 degrees. The two bending pieces 65 are stoppers that regulate the air supply valve body 21 from detaching from the upper part of the cylindrical screen 60.

[0036] The float 3 located in the valve chamber space 10 has a hollow spherical shape and is fixed to the mounting portion 31 as shown in FIG. 1. This mounting portion 31 is connected to the float arm 32 via a connecting shaft 31a. The mounting portion 31 can swing slightly with respect to the float arm 32 about the connecting shaft 31a. On the other hand, the float arm 32 can swing in the rotational direction about a swing shaft 32a supported by the lid 8.

[0037] One end of a connecting arm 33 is swingably connected to a connecting shaft 31a that connects the mounting portion 31 and the float arm 32. The other end of the connecting arm 33 is swingably connected to the tip of the main arm 34 via a connecting shaft 33a. The rear end of the main arm 34 is connected to a swing shaft 34a supported by the lid 8, and the main arm 34 is swingable about the swing shaft 34a. A main arm stopper 34b supported by the lid 8 is disposed below the rear end of the main arm 34, and the main arm stopper 34b abuts against the rear end of the main arm 34 to restrict the counterclockwise rotation of the main arm 34.

[0038] A sub-arm 35 is further swingably connected to the swing shaft 34a that supports the main arm 34. A sub-arm stopper 39 is disposed below the sub-arm 35, and the sub-arm stopper 39 abuts against the rear end of the sub-arm 35 to restrict the clockwise rotation of the sub-arm 35. The sub-arm stopper 39 abuts against the rear end of the sub-arm 35 and the lower end of the lifting rod 22, but does not abut against the main arm 34 and does not interfere with the swing of the main arm 34.

[0039] A transmission hole 35b (FIG. 2) is formed at the rear end of the sub-arm 35, and the transmission hole 35b is fitted onto a transmission shaft 22a provided on the above-described lifting rod 22, whereby the rear end of the sub-arm 35 and the lifting rod 22 of the air supply valve 18 are connected. The inner diameter of the transmission hole 35b of the sub-arm 35 is configured to be larger than the diameter of the transmission shaft 22a (see FIG. 2).

[0040] As shown in FIG. 1, the main arm 34 incorporates a spring 40 and a spring receiver 42 on the tip side. The spring receiving portion 42 is held reciprocally movable in the longitudinal direction of the main arm 34, and the spring 40 contacts the spring receiving portion 42 and biases the spring receiving portion 42 toward the rear end side. A movable shaft 36a is provided on the spring receiving portion 42, and the movable shaft 36a reciprocates integrally with the spring receiving portion 42.

[0041] The tip of the snap arm 36 is swingably connected to a movable shaft 36a provided on the spring receiving portion 42. Further, the rear end of the snap arm 36 is connected to the tip of the sub-arm 35 by a movable shaft 35a. Since this movable shaft 35a is not supported on the lid 8 side, while connecting the snap arm 36 and the sub-arm 35, the movable shaft 35a itself is movable in the vertical direction. In this embodiment, the main arm 34 incorporating the spring 40, the sub-arm 35, and the snap arm 36 constitute a snap mechanism.

[0042] (Operation of the drain pumping device 1) Next, the operation of the drain pumping device 1 will be described. In an initial state where no drain is stored in the valve chamber space 10 of the drain pumping device 1, as shown in FIG. 1, the float 3 has dropped due to its own weight. At this time, since the sub-arm 35 of the link mechanism 5 is in a state of swinging clockwise to the limit position in FIG. 1, the lifting rod 22 of the air supply valve 18 has dropped in the direction of arrow 92 (see FIG. 2). As a result, the air supply valve body 21 of the air supply valve 18 seats on the valve seat around the air supply valve port 24 due to its own weight and the high pressure of the steam introduced from the steam inlet 11 along the direction of arrow 93, closing the air supply valve port 24, and the air supply valve 18 is in a closed state.

[0043] From this state, when drain flows into the valve chamber space 10 through the drain inlet 16 and is stored in the valve chamber space 10, the float 3 rises according to the water level of the stored drain. Due to the rise of the float 3, the mounting portion 31 swings slightly clockwise in FIG. 1, and subsequently the float arm 32 swings clockwise about the swing shaft 32a. The swing of the float arm 32 is transmitted to the main arm 34 via the connecting arm 33, and the main arm 34 also swings clockwise about the swing shaft 34a in the same manner.

[0044] Here, in the initial state, the snap line connecting the swing shaft 34a, the movable shaft 35a, and the movable shaft 36a is bent upward (see Fig. 1). From this state, the main arm 34 swings clockwise, but the sub-arm 35 does not swing because its clockwise rotation is restricted by the sub-arm stopper 39. As a result, the spring receiving portion 42 to which the tip of the snap arm 36 is connected slides toward the tip side of the main arm 34 while compressing the spring 40, and the above-mentioned snap line bent by the downward movement of the movable shaft 35a approaches a straight line.

[0045] And when the movable shaft 35a crosses the straight line connecting the swing shaft 34a and the movable shaft 36a, the spring receiving portion 42 receives the biasing force of the spring 40 and quickly returns to the rear end side of the main arm 34, and the snap line connecting the swing shaft 34a, the movable shaft 35a, and the movable shaft 36a suddenly changes to a downward bent line (not shown). As a result, the sub-arm 35 snaps counterclockwise in Fig. 1.

[0046] The counterclockwise snap movement of the sub-arm 35 is transmitted to the lifting shaft 22 of the air supply valve 18 via the transmission shaft 22a, and the lifting shaft 22 moves upward in one go to the limit position in the direction of arrow 91. As described above, since the inner diameter of the transmission hole 35b of the sub-arm 35 is larger than the diameter of the transmission shaft 22a (see Fig. 2), the swinging of the sub-arm 35 in the rotational direction is smoothly converted into the linear lifting movement of the lifting shaft 22.

[0047] When the lifting shaft 22 moves upward in the direction of arrow 91, the tip portion 22b of the lifting shaft 22 protrudes from the air supply valve port 24 toward the intervening space 19 side, pushing up the air supply valve body 21. As a result, the high-pressure steam introduced into the intervening space 19 from the steam inlet 11 in the direction of arrow 93 flows into the through hole 29 from the air supply valve port 24.

[0048] Then, the high-pressure steam passes between the inner peripheral surface of the through-hole 29 and the thickness surface 55 of the lifting rod 22 (B in FIG. 3) and is introduced into the valve chamber space 10. When high-pressure steam is introduced into the valve chamber space 10 and the internal pressure rises, the drain stored in the valve chamber space 10 is pushed out by the steam pressure, discharged from the drain outlet 17, and pumped.

[0049] When the water level of the drain in the valve chamber space 10 drops due to the discharge of the drain, the float 3 accordingly descends, and the float arm 32 and the main arm 34 swing counterclockwise in FIG. 1. At this time, since the lifting shaft 22 has moved upward to the limit position, the sub-arm 35 connected to the lifting shaft 22 does not rotate counterclockwise.

[0050] As a result, the downward-bent snap line connecting the swing shaft 34a, the movable shaft 35a, and the movable shaft 36a approaches a straight line, and when the movable shaft 35a exceeds the straight line connecting the swing shaft 34a and the movable shaft 36a, it suddenly changes to the upward-bent snap line. In response to this change, the sub-arm 35 suddenly snaps and moves clockwise in FIG. 1. The clockwise snap movement of the sub-arm 35 is transmitted to the lifting shaft 22 of the air supply valve 18 via the transmission shaft 22a, and the lifting shaft 22 moves downward in one go in the direction of arrow 92 and returns to the initial state shown in FIG. 1.

[0051] As a result, the air supply valve body 21 seats on the valve seat around the air supply valve port 24, closes the air supply valve port 24, and the air supply valve 18 closes. Thereby, the introduction of high-pressure steam into the valve chamber space 10 stops. After that, when drain flows into the valve chamber space 10 again and is stored, the above operation is repeated.

[0052] (Operability and durability of the air supply valve 18) As described above, the drain pumping device 1 automatically pumps the inflowing drain as appropriate by intermittently introducing high-pressure steam. By the way, as described above, the cylindrical screen 60 provided in the air supply valve 18 is directly fixed and attached to the valve case 20 in which the air supply valve port 24 is formed by fitting the locking projection 68 into the locking space 23b formed on the valve case 20 side. That is, since the cylindrical screen 60 is not configured to be fixed to the cap 26 or the lid 8, when the cylindrical screen 60 is displaced relative to the air supply valve port 24 and the air supply valve body 21 closes the air supply valve port 24, the cylindrical screen 60 does not interfere, and the air supply valve 18 can be surely closed.

[0053] In the present embodiment, since the cap 26 is provided above the intervening space 19, when performing maintenance or the like on the cylindrical screen 60, the cap 26 can be removed and the cylindrical screen 60 can be easily taken out from the intervening space 19. When separating the cylindrical screen 60 from the valve case 20 of the air supply valve 18, the cylindrical screen 60 is rotated in a direction opposite to the direction of the arrow 95 shown in FIG. 5, and the locking projection 68 of the cylindrical screen 60 is disengaged from the locking space 23b formed on the valve case 20 side. After that, if the cylindrical screen 60 is pulled upward, the cylindrical screen 60 can be taken out from the intervening space 19.

[0054] In the present embodiment, the cylindrical screen 60 is fixed to the valve case 20 by fitting the locking projection 68 of the cylindrical screen 60 and the locking space 23b of the valve case 20. However, as another embodiment, the cylindrical screen 60 may be screwed to the valve case 20 via a screw mechanism. Also, the cylindrical screen 60 can be fixed to the valve case 20 by welding. In this case, it may be fixed by spot welding only at several locations (for example, about 4 locations).

[0055] Also, as described above, two bent pieces 65 as stoppers are arranged at the upper end of the cylindrical screen 60. Therefore, when the air supply valve body 21 moves upward, it is possible to prevent the air supply valve body 21 from detaching from the cylindrical screen 60. At the same time, it is possible to prevent the air supply valve body 21 from colliding with the cap 26 or the lid 8, and to avoid wear and deformation of the air supply valve body 21.

[0056] By avoiding wear and deformation of the air supply valve body 21, rotation when the air supply valve body 21 moves up and down is suppressed, breakage of the mesh portion 63 due to collision with the cylindrical screen 60 and wear of the valve seat around the air supply valve port 24 are prevented, and reliable closing of the air supply valve port 24 by the air supply valve body 21 can be ensured.

[0057] Note that since the upper end frame 61 and the bent pieces 65 of the cylindrical screen 60 are formed by processing a thin metal plate, the two bent pieces 65 are flexible members that can bend and can absorb the impact when the air supply valve body 21 rises and collides. Thereby, wear and deformation of the air supply valve body 21 can be more reliably avoided.

[0058] In this embodiment, an example in which two bent pieces 65 are formed on the upper end frame 61 of the cylindrical screen 60 is shown, but one or three or more bent pieces 65 may be provided. For example, four bent pieces 65 can also be arranged in the cross direction.

[0059] FIG. 6 shows another embodiment of the cylindrical screen. This cylindrical screen 70 includes a flat circular stopper plate 75 instead of the two bent pieces 65 shown in FIG. 4. An opening 75a is formed in the center of the stopper plate 75 and is fixed to the upper end frame 71 by, for example, welding. By forming the opening 75a in the stopper plate 75, high-pressure steam can flow into the cylindrical screen 70 from the upper end of the cylindrical screen 70.

[0060] Note that the point that the mesh portion 73 is integrally fixed between the upper end frame 71 and the lower end frame 72 of the cylindrical screen 70, and the point that two locking protrusions 78 are fixed to the outer periphery of the bottom of the lower end frame 72 are the same as those of the cylindrical screen 60 shown in FIG. 4, and the functions of each part are also the same as those of the cylindrical screen 60.

[0061] [Other Embodiments] In the above-described embodiments, examples have been given for each of the liquid pumping device, the target liquid, the target liquid inflow portion, the valve chamber portion, the target liquid outflow portion, the operating gas, the operating gas introduction portion, the main body portion, the responsive portion, the operating valve portion, the operating valve body, the reference axis, the valve body portion, the guide central axis, the guide portion, the connecting means, and the restricting means. However, these are merely examples, and different configurations can be adopted for each of them.

[0062] That is, in the above-described embodiments, drain has been exemplified as the target liquid, and steam has been exemplified as the operating gas. However, different liquids or gases can be used respectively. For example, high-pressure air or the like can be used as the operating gas.

[0063] Also, in the above-described embodiments, the float 3 has been exemplified as the responsive portion. However, other shapes and structures can be adopted as long as the state changes according to the storage amount of the target liquid (such as drain) stored in the valve chamber portion (such as the valve seat space 10).

[0064] Furthermore, in the above-described embodiments, the air supply valve 18 has been exemplified as the operating valve portion. However, other configurations can be used as long as it closes or opens according to the change in the state of the responsive portion (such as the float 3), and when it opens, it introduces the high-pressure operating gas (such as steam) into the valve chamber portion (such as the valve chamber space 10) to pump the target liquid (such as drain).

[0065] In the above-described embodiment, the air supply valve body 21 having a spherical shape is exemplified as the valve body portion. However, any other configuration may be used as long as it reciprocates according to the change in the state of the responsive portion (such as the float 3) and closes or opens the flow path of the operating gas (such as steam) from the operating gas introduction portion (such as the steam inlet 11) to the valve chamber portion (such as the valve chamber space 10). For example, a disk-shaped valve body may be adopted as the valve body portion. Further, a configuration in which the tip portion 22b of the lifting rod 22 is fixed to the air supply valve body 21 by welding or the like may be adopted.

[0066] In the above-described embodiment, the cylindrical screens 60 and 70 are exemplified as the guide portion. However, any other configuration may be used as long as it holds the valve body portion movably inward, is connected to the operating valve body by the connecting means, and further contacts the valve body portion to regulate the reciprocating movement of the valve body portion. For example, a shape other than the cylindrical shape may be adopted. Further, as the connecting means, the insertion space 23a, the locking space 23b, the locking projection 68, the screw mechanism, or the fixing by welding is exemplified. However, any other means may be used as long as it connects the guide portion (such as the cylindrical screens 60 and 70) and the operating valve body (such as the valve case 20).

[0067] In addition, as the restricting means, the bent piece 65 and the stopper plate 75 are exemplified. However, any other shape or structure may be adopted as long as it contacts the valve body portion (such as the air supply valve body 21) to regulate the reciprocating movement of the valve body portion and avoid the contact between the valve body portion (such as the air supply valve body 21) and the main body portion (such as the body 7 and the lid 8). It should be noted that the above-described embodiments may be combined to form a new embodiment.

Explanation of Reference Numerals

[0068] 1: Drain pumping device 3: Float 7: Body 8: Lid 10: Valve chamber space 11: Steam inlet 16: Drain inlet 17: Drain outlet 18: Air supply valve 20: Valve case 21: Air supply valve body 23a: Insertion space 23b: Locking space 60, 70: Cylindrical screens 65: Bent piece 68: Locking projection 75: Stopper plate 80: Center line

Claims

1. A main body portion having a target liquid inlet portion into which a target liquid flows, a valve chamber portion for storing the introduced target liquid, a target liquid outlet portion from which the stored target liquid flows out, and an operating gas introduction portion for introducing a high-pressure operating gas, A responsive portion whose state changes according to the storage amount of the target liquid stored in the valve chamber portion, An operating valve portion that closes or opens according to the change in the state of the responsive portion, and when opened, introduces the high-pressure operating gas into the valve chamber portion, thereby causing the target liquid stored in the valve chamber portion to flow out from the target liquid outlet portion and be pressure-fed. In a liquid pressure feeding device comprising: The operating valve portion is: An operating valve body, A valve body portion provided on the operating valve body so as to be reciprocally movable in the reference axis direction, which reciprocally moves according to the change in the state of the responsive portion, and closes or opens the flow path of the operating gas from the operating gas introduction portion toward the valve chamber portion. A guide portion arranged such that the guide center axis coincides with the reference axis, and internally holds the valve body portion so as to be reciprocally movable, and is connected to the operating valve body by a connecting means, and has a regulating means that contacts the valve body portion to regulate the reciprocal movement of the valve body portion and avoid contact between the valve body portion and the main body portion. It is provided with: A liquid pressure feeding device characterized by the above.

2. In the liquid pressure feeding device according to Claim 1, The valve body portion has a spherical shape, The guide portion has a cylindrical shape. A liquid pressure feeding device characterized by the above.

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