Discharge amount monitoring device

Abstract

To provide a discharge amount monitoring device capable of monitoring that a specified amount is discharged by a stable operation.SOLUTION: A discharge amount monitoring device 100 includes: a set screw 120 having a first flow channel 124 where fluid flows, arranged on an inflow port side in a cylinder 110; a check ball 130 capable of moving in the cylinder; a second flow channel 114 in which fluid flows on the side of the check ball; a ball stopper part 140 for regulating predetermined movement or more of the check ball; a movable nozzle 150 having a third flow channel 152 where fluid flows; an opening spring 160 for energizing the check ball and the movable nozzle in a direction to separate them; and a return spring 170 for energizing the movable nozzle in an inflow port direction. The movable nozzle moves only by the pressing force of the fluid after the movement of the check ball is regulated by the ball stopper part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a discharge amount monitoring device that monitors whether a specified amount of fluid has been discharged, and more particularly to a discharge amount monitoring device used to check the discharge of lubricant at the end of an automatic lubrication system. [Background technology]

[0002] Moving parts of machines are lubricated with oil or grease to prevent wear and reduce friction. With growing interest in SDGS, there is a trend toward reducing lubricant consumption. Conventionally, a flow switch, as disclosed in Non-Patent Document 1, is used as a device for monitoring the amount of lubricant discharged. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Internet URL<http: / / www.katohgiken.co.jp / switch / images / MK.pdf> Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional discharge rate monitoring devices such as those described in Non-Patent Document 1 are piston resistance type devices that use the reaction force of a spring and the resistance of a piston, and the piston moves as the fluid leaks around the piston's periphery. Therefore, the amount of piston movement varies depending on the viscosity and flow rate of the fluid. Furthermore, depending on the conditions, the piston may barely move or may not return from top dead center to bottom dead center, making detection impossible. Thus, piston resistance type devices have the problem of unstable operation and making it difficult to monitor whether the specified amount has been discharged.

[0005] The present invention has been made in consideration of the above problems, and its purpose is to provide a new and improved discharge amount monitoring device that can monitor whether a specified amount has been discharged with stable operation. [Means for solving the problem]

[0006] In order to solve the above problem, according to the present invention, there is provided a discharge volume monitoring device that monitors whether a specified amount of fluid has been discharged, comprising: a cylinder having an inlet and an outlet for fluid; a first movable member that is movable within the cylinder; a second flow path through which fluid flows from the inlet side to the outlet side alongside the first movable member; a movement regulating section that regulates the movement of the first movable member beyond a predetermined level; a second movable member that is arranged downstream of the first movable member, is movable within the cylinder, and has a third flow path through which fluid flows from the inlet side to the outlet side; a first movable member opening spring that urges the first movable member and the second movable member in a direction separating them; and a return spring that urges the second movable member toward the inlet, wherein after the movement of the first movable member is regulated by the movement regulating section, only the second movable member moves and separates from the first movable member.

[0007] With this configuration, when discharging fluid from the cylinder, after the movement of the first moving member is restricted by the movement restriction portion, the second moving member moves alone, separating it from the first moving member and opening the third flow path. At the same time, the pressure difference between the inlet and outlet sides of the second moving member is eliminated, eliminating the pressing force acting on the first moving member toward the outlet, and the first moving member release spring maintains the separation between the first and second moving members. Therefore, while the return spring biases the second moving member to bottom dead center, the second and first moving members remain separated. This ensures sufficient third flow path, allowing the piston to move (return) to bottom dead center with little resistance. Therefore, the discharge rate monitoring device can monitor whether the specified amount has been discharged with stable operation. When a magnetic switch (on-off switch) is used, the discharge rate monitoring device monitors whether the specified amount has been discharged. When a magnetic analog sensor is used, the flow rate can be measured up to top dead center.

[0008] Various application examples of the present invention are conceivable. For example, the first moving member may be a check ball that is movably fitted in the cylinder.

[0009] The movement restricting portion may be a protrusion that protrudes from the inner periphery of the cylinder toward the center. With this configuration, the movement restricting portion can be easily configured.

[0010] The movement restricting portion may be a ball stopper pin extending in the axial direction within the cylinder. With this configuration, the movement restricting portion can be easily configured.

[0011] The movement restricting portion may be a cylindrical ball stopper pipe that is fitted onto an inner circumferential surface of the third flow path so that the first moving member can move. With this configuration, the movement restricting portion can be easily configured.

[0012] Furthermore, the ball stopper pipe may have an oil passage formed therein that penetrates the wall portion. With this configuration, the first moving member can be reliably moved away from the ball stopper pipe.

[0013] Furthermore, a magnet that moves integrally with the second moving member may be provided on the outer periphery of the ball stopper pipe, and a magnetic sensor that detects the position of the magnet may be provided outside the cylinder. With this configuration, by providing a magnet that moves integrally with the second moving member and magnetically attracting the first moving member, the first moving member release spring can be strengthened. As a result, even with hard grease, the first moving member can be reliably released and returned to the piston bottom dead center. Furthermore, by providing an external magnetic sensor, the position of the second moving member can be detected.

[0014] The ball stopper pipe may be movable within the cylinder, the cylinder may have a ball stopper pipe movement restriction portion that restricts movement of the ball stopper pipe beyond a predetermined amount, and the second moving member may move integrally with the ball stopper pipe until the movement of the ball stopper pipe is restricted by the ball stopper pipe movement restriction portion, but after the movement is restricted, the second moving member may move relative to the ball stopper pipe. With this configuration, the specified discharge amount can be changed by changing the depth of the cylinder, thereby enabling the device to accommodate large discharge amounts.

[0015] Furthermore, a magnet that moves integrally with the second moving member may be provided, and a repulsive magnet that repels the magnet near the top dead center of the first moving member may be provided in the cylinder or the ball stopper pipe. Alternatively, the repulsive magnet may act in a direction that constantly repels the magnet. With this configuration, the repulsive force of the repulsive magnet can reliably impart a returning force to the ball stopper pipe even when the resistance of the viscous fluid is small.

[0016] The cylinder or the ball stopper pipe may be provided with a stopper pipe return spring that returns the first moving member to a return position near the top dead center. With this configuration, the elastic force of the stopper pipe return spring can reliably apply a returning force to the ball stopper pipe even when the resistance of the viscous fluid is small.

[0017] Furthermore, a check valve may be provided upstream or downstream of the first moving member to prevent the viscous fluid from flowing back from the outlet toward the inlet. With this configuration, the viscous fluid can be prevented from flowing back from the outlet toward the inlet.

[0018] Furthermore, a small-diameter cylinder portion having a diameter smaller than that of the second moving member may be provided near the outlet of the cylinder, and the tip of the ball stopper pipe may be movably disposed in the small-diameter cylinder portion, and the small-diameter cylinder portion may have a ball stopper pipe movement restricting portion. With this configuration, a return spring or the like can be installed outside the small-diameter cylinder portion, allowing for greater design freedom. Furthermore, because volume change occurs in the small-diameter cylinder portion, the piston can move significantly with a small flow rate. [Effects of the Invention]

[0019] According to the present invention, a discharge amount monitoring device is provided that can monitor whether a specified amount of ink has been discharged with stable operation. Other effects of the present invention will be described in the detailed description of the invention below. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a diagram showing a configuration of a discharge amount monitoring device 100 according to a first embodiment. [Figure 2] FIG. 10 is a diagram showing a state in which the movable nozzle 150 has reached the top dead center. [Figure 3]10A and 10B are diagrams showing the configuration of a discharge rate monitoring device 200 according to a second embodiment, in which (a) shows a state in which the check ball 130 and the ball stopper pin 240 are spaced apart, and (b) shows a state in which the check ball 130 and the ball stopper pin 240 are spaced apart. [Figure 4] FIG. 10 is a diagram showing the configuration of a discharge amount monitoring device 300 according to a third embodiment. [Figure 5] FIG. 10 is a diagram showing the configuration of a discharge amount monitoring device 400 according to a fourth embodiment. [Figure 6] FIG. 10 is a diagram showing the configuration of a discharge amount monitoring device 500 according to a fifth embodiment. [Figure 7] FIG. 10 is a diagram showing the configuration of a discharge amount monitoring device 600 according to a sixth embodiment. [Figure 8] 10A and 10B are diagrams showing the configuration of a discharge amount monitoring device 700 according to a seventh embodiment, in which (a) shows an example in which a stopper pipe return magnet 780 is used, and (b) shows an example in which a stopper pipe return spring 790 is used. [Figure 9] FIG. 10 is a diagram showing the configuration of a discharge amount monitoring device 800 according to an eighth embodiment. [Figure 10] FIG. 13 is a diagram illustrating a modified example of the eighth embodiment. [Figure 11] FIG. 13 is a diagram showing the configuration of a discharge amount monitoring device 900 according to a ninth embodiment. [Figure 12] FIG. 13 is a diagram illustrating a first modified example of the ninth embodiment. [Figure 13] FIG. 13 is a diagram illustrating a second modified example of the ninth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0022] (First embodiment) The configuration of a discharge amount monitoring device 100 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing the configuration of the discharge amount monitoring device 100 according to this embodiment.

[0023] The discharge rate monitoring device 100 is a sensor that detects or measures the minute low-speed flow rate of a viscous fluid. As shown in Fig. 1, the discharge rate monitoring device 100 includes a cylinder 110, a set screw 120, a check ball 130 (first moving member), a ball stopper portion 140 (movement restricting portion), a movable nozzle 150 (second moving member), an opening spring 160 (first moving member opening spring), and a return spring 170. Each of the components will be described in detail below.

[0024] (Cylinder 110) 1, the cylinder 110 is configured to include an inlet 110a for allowing the viscous fluid to flow into the interior of the cylinder 110 from a viscous fluid supply device, and an outlet 110b for discharging the viscous fluid from the interior of the cylinder 110 to a portion to be supplied. The diameter of the interior of the cylinder 110 narrows in four stages from the inlet 110a to the outlet 110b.

[0025] As shown in FIG. 1, the inlet 110a is configured as an O-ring seal formed in a substantially L-shape so that an O-ring can be fitted. The end of the inlet 110a is the largest-diameter mounting thread 111, to which a set screw 120 is fixed with threads 126. The set screw 120 is sealed at the contact point with the cylinder 110. Because the inlet 110a is configured as an O-ring seal formed in a substantially L-shape so that an O-ring can be fitted, a one-touch fitting can also be attached. Furthermore, because the inlet 110a is designed to be sealed with a bushing sleeve, a bushing fitting can also be attached without using an O-ring. The bushing fitting can be fastened to the thread of the mounting thread 111.

[0026] A check ball sliding portion 112 having a smaller diameter than the mounting screw portion 111 is formed on the downstream side of the mounting screw portion 111. A check ball 130 is slidably disposed in the check ball sliding portion 112. A second flow path 114 is formed in the check ball sliding portion 112 in the shape of a groove, connecting the mounting screw portion 111 with a movable nozzle sliding portion 113 (described later). A ball stopper portion 140 is formed at the downstream end of the check ball sliding portion 112, protruding toward the center. The ball stopper portion 140 restricts downstream movement of the check ball 130. The second flow path 114 is formed deeper than the ball stopper portion 140.

[0027] A movable nozzle sliding part 113 having a smaller diameter than the check ball sliding part 112 is formed on the downstream side of the check ball sliding part 112. A movable nozzle 150 is slidably disposed on the movable nozzle sliding part 113. In addition, a return spring 170 is disposed between the movable nozzle 150 on the circumferential surface of the movable nozzle sliding part 113 and the downstream end of the movable nozzle sliding part 113, which urges the movable nozzle 150 toward the inlet 110a. In addition, an open spring 160 is disposed across the check ball sliding part 112 and the movable nozzle sliding part 113.

[0028] An outlet-side flow path 115 having a smaller diameter than the movable nozzle sliding part 113 is formed downstream of the movable nozzle sliding part 113. The outlet-side flow path 115 connects the movable nozzle sliding part 113 and the outlet 110b.

[0029] (Set screw 120) 1, the set screw 120 is disposed in the mounting thread portion 111 on the inlet 110a side of the cylinder 110 and is fixed with a screw 126. A contact portion 122 that protrudes downstream near the center of the downstream end of the set screw 120 is formed. The contact portion 122 contacts a check ball 130.

[0030] A first flow path 124, through which the viscous fluid flows from the inlet 110a side to the outlet 110b side, is formed in the set screw 120, penetrating from the upstream side to the downstream side. The first flow path 124 has a center-side flow path 124a of the abutting portion 122 and an outer peripheral surface-side flow path 124b of the abutting portion 122. A check ball 130 is disposed at the downstream end of the center-side flow path 124a, and is pressed by the viscous fluid flowing through the center-side flow path 124a. The downstream end of the outer peripheral surface-side flow path 124b is connected to the check ball sliding portion 112, and the viscous fluid that flows into the check ball sliding portion 112 presses the check ball 130 and flows through the second flow path 114 toward the movable nozzle sliding portion 113.

[0031] The set screw 120 has a hole drilled on the side so that it is not sealed by the check ball 130. A tool is inserted into this hole and the set screw 120 is fixed to the cylinder 110 with a screw 126.

[0032] (Check Ball 130) The check ball 130 blocks the third flow path 152 of the movable nozzle 150. As shown in Fig. 1, the check ball 130 is disposed in the check ball sliding portion 112. The check ball 130 abuts against the abutment portion 122 of the set screw 120 on the upstream side, and is capable of abutting against and separating from the movable nozzle 150 on the downstream side.

[0033] The check ball 130 is pressed in a direction away from the movable nozzle 150 by the elastic force of the opening spring 160, which will be described later. Because the pressing force of the movable nozzle 150 is greater than the force of the opening spring 160, the check ball 130 seals the third flow path 152 before the pressure of the viscous fluid is applied.

[0034] (Ball stopper part 140) The ball stopper portion 140 restricts the movement of the check ball 130 beyond a predetermined distance, thereby enabling it to separate from the movable nozzle 150. As shown in Fig. 1, the ball stopper portion 140 is configured by the inner surface of the cylinder 110 protruding toward the center. The ball stopper portion 140 can be shaped, for example, as a cone or a stepped cylinder.

[0035] (movable nozzle 150) The movable nozzle 150 pushes out the viscous fluid in the cylinder 110 from the outlet 110b. As shown in Fig. 1, the movable nozzle 150 is movably arranged on the movable nozzle sliding part 113. The movable nozzle 150 can come into contact with and separate from the downstream side of the check ball 130, and can move together with the check ball 130 while it is in contact with the check ball 130. When the movable nozzle 150 is separated from the check ball 130, it can move the movable nozzle sliding part 113 by the action of the viscous fluid flowing into the movable nozzle sliding part 113 or the action of the return spring 170.

[0036] Movable nozzle 150 is configured in a cylindrical shape with a tip 150a that expands in diameter. Tip 150a and the circumferential surface of movable nozzle sliding part 113 are sealed with an O-ring or metal seal, preventing viscous fluid from leaking out from the outer periphery of movable nozzle 150. In this way, movable nozzle sliding part 113 and movable nozzle 150 are sealed to the extent that pressure does not leak, so movable nozzle 150 moves due to the pressure that movable nozzle sliding part 113 and movable nozzle 150 receive as a result of being sealed.

[0037] (Release spring 160) The opening spring 160 biases the check ball 130 and the movable nozzle 150 in a direction separating them from each other. The opening spring 160 is disposed between the circumferential surface of the check ball 130 and the movable nozzle 150.

[0038] (return spring 170) The return spring 170 biases the movable nozzle 150 toward the inlet 110a. As shown in FIG. 1, the return spring 170 is disposed between the tip 150a of the movable nozzle 150 and the downstream end of the movable nozzle sliding part 113.

[0039] The above has described the configuration of the discharge rate monitoring device 100. The operation of the discharge rate monitoring device 100 will now be described with reference to FIG.

[0040] 1, before a viscous fluid is supplied to the discharge rate monitoring device 100, the movable nozzle 150 is pressurized by the return spring 170, compressing the release spring 160 and bringing it into contact with the check ball 130. When the viscous fluid flows into the inlet 110a of the cylinder 110, the movable nozzle 150 is pressurized by the return spring 170 and the movable nozzle 150 and check ball 130 are sealed, so that pressure is generated on the primary side when the viscous fluid is pushed in. Due to this pressure, the check ball 130 is loaded in the downstream direction by the viscous fluid that flows into the check ball sliding part 112 via the first flow path 124.

[0041] When the pressure on the inlet 110a side increases further, the check ball 130 and the movable nozzle 150 move while compressing the release spring 160. As the check ball 130 and the movable nozzle 150 move, the viscous fluid flows from the second flow path 114 into the movable nozzle sliding part 113 and is discharged from the outlet 110b.

[0042] 2, the check ball 130 gets caught on the ball stopper portion 140, and the movable nozzle 150 is further pushed in by the pressure of the viscous fluid flowing into the movable nozzle sliding portion 113. This causes the movable nozzle 150 and the check ball 130 to separate. Therefore, the pressure difference between the inlet 110a side and the outlet 110b side via the movable nozzle 150 disappears, and the load acting in the downstream direction on the check ball 130 disappears. As a result, the movable nozzle 150 maintains the separation of the check ball 130 due to the force of the release spring 160, and the movable nozzle 150 returns to the bottom dead center due to the force of the return spring 170, and as shown in FIG. 1, it comes into contact with the check ball 130 with the release spring 160 compressed.

[0043] (Effects of the first embodiment) As described above, according to this embodiment, when viscous fluid is discharged from the cylinder 110, after the movement of the check ball 130 is restricted by the ball stopper portion 140, only the movable nozzle 150 moves. After a specified amount of viscous fluid has been discharged, the pressure difference between the inlet 110a side and the outlet 110b side of the movable nozzle 150 disappears, so the pressing force acting on the check ball 130 toward the outlet 110b disappears, and the release spring 160 maintains the separation between the check ball 130 and the piston. Therefore, while the movable nozzle 150 is moved to the bottom dead center by the biasing force of the return spring 170, the movable nozzle 150 and the check ball 130 remain separated from each other, so that the movable nozzle 150 can monitor whether the specified amount has been discharged with stable operation. Note that the specified amount in the discharge amount monitoring device 100 refers to the volume from the bottom dead center to the ball stopper portion 140. The same applies to the following embodiments.

[0044] The following describes an application example of the first embodiment, focusing on differences from the first embodiment, and components having substantially the same functional configurations are designated by the same reference numerals to avoid redundant description.

[0045] (Second embodiment) The configuration of a discharge rate monitoring device 200 according to a second embodiment will be described with reference to Fig. 3. Fig. 3 is a diagram showing the configuration of the discharge rate monitoring device 200 of this embodiment. The discharge rate monitoring device 200 of this embodiment is for extremely small flow rates and differs from the first embodiment in the configuration of the movement restriction unit that restricts the movement of the check ball 130. In this embodiment, the differences from the first embodiment will be mainly described. Components having substantially the same functional configuration will be assigned the same reference numerals, and redundant description will be omitted.

[0046] The discharge volume monitoring device 200 replaces the ball stopper portion 140 formed on the cylinder 110 in the discharge volume monitoring device 100 of the first embodiment with a ball stopper pin 240 (movement restriction portion) arranged on the movable nozzle sliding portion 113 of the cylinder 110.

[0047] As shown in Figure 3, the ball stopper pin 240 is composed of a cylindrical pin portion 242 that extends over the entire axial length of the movable nozzle sliding portion 113 of the cylinder 110, and a disk-shaped bottom portion 244 from which the pin portion 242 extends. The pin portion 242 is inserted axially into the center of the movable nozzle 150. The bottom portion 244 has an opening 246 through which the viscous fluid flows out. The bottom portion 244 of the ball stopper pin 240 is fitted into the downstream end of the movable nozzle sliding portion 113. A return spring 170 is arranged between the tip portion 150a of the movable nozzle 150 and the bottom portion 244 of the ball stopper pin 240, and the bottom portion 244 is held in place by the return spring 170.

[0048] This concludes the description of the configuration of the discharge rate monitoring device 200. The operation of the discharge rate monitoring device 200 will now be described with reference to FIG.

[0049] Before a viscous fluid is supplied to the discharge rate monitoring device 200, as shown in FIG. 3(a), the check ball 130 is in contact with the set screw 120 due to the forces of the release spring 160 and the return spring 170. When a viscous fluid flows into the cylinder 110, the check ball 130 and the movable nozzle 150 move, as in the first embodiment. As shown in FIG. 3(b), the check ball 130 comes into contact with the tip of the pin portion 242 of the ball stopper pin 240, restricting its movement, and only the movable nozzle 150 moves, as in the first embodiment. Other operations are the same as in the first embodiment.

[0050] (Effects of the second embodiment) As described above, according to this embodiment, by using the ball stopper pin 240 as the movement restricting portion, the resistance of the third flow path 152 increases when only the movable nozzle 150 moves, making it easier for only the movable nozzle 150 to move. This is particularly effective for fluids with low viscosity.

[0051] (Third embodiment) The configuration of a discharge rate monitoring device 300 according to a third embodiment will be described with reference to Fig. 3. Fig. 4 is a diagram showing the configuration of the discharge rate monitoring device 300 of this embodiment. The discharge rate monitoring device 300 of this embodiment is for minute flow rates and differs from the first embodiment in the configuration of the movement restriction unit for restricting the movement of the check ball 130. In this embodiment, the differences from the first embodiment will be mainly described. Components having substantially the same functional configuration will be assigned the same reference numerals, and redundant description will be omitted.

[0052] The discharge volume monitoring device 300 replaces the ball stopper portion 140 formed on the cylinder 110 in the discharge volume monitoring device 100 of the first embodiment with a ball stopper pipe 340 (movement restriction portion) arranged on the movable nozzle sliding portion 113 of the cylinder 110.

[0053] As shown in FIG. 4, the ball stopper pipe 340 is cylindrical and extends over the entire axial length of the movable nozzle sliding portion 113 of the cylinder 110. The ball stopper pipe 340 has one upstream through-hole 340a and two downstream through-holes 340b formed at three axial locations, which connect the movable nozzle sliding portion 113 with the inside of the ball stopper pipe 340. The upstream through-hole 340a is formed within the range in which the movable nozzle 150 slides and opens and closes as the movable nozzle 150 slides. The upstream through-hole 340a needs to be located in at least one location, but may be located in two locations. The downstream through-hole 340b is formed outside the range in which the movable nozzle 150 slides and is always open. The downstream through-hole 340b needs to be located in at least one location, but may be located in two locations.

[0054] The upstream end of the ball stopper pipe 340 is slidably fitted onto the inner circumferential surface of the movable nozzle 150. The downstream end of the ball stopper pipe 340 is fixed to the downstream end of the movable nozzle sliding part 113 by a pipe fixing bush 342. The pipe fixing bush 342 has a cylindrical shape with a flange, and the ball stopper pipe 340 is fitted onto the inner circumferential surface of the cylinder. The flange of the pipe fixing bush 342 is fitted onto the downstream end of the movable nozzle sliding part 113. A return spring 170 is disposed between the tip end 150a of the movable nozzle 150 and the flange of the pipe fixing bush 342, and the pipe fixing bush 342 is held by the return spring 170. Note that, because the pipe fixing bush 342 is held by the return spring 170, the pipe fixing bush 342 does not necessarily have to be fitted onto the movable nozzle sliding part 113.

[0055] The downstream end of the ball stopper pipe 340 and the upstream through-hole 340a at the adjacent upstream position communicate with the third flow path 152, allowing the viscous fluid downstream of the movable nozzle 150 to flow in and out.

[0056] This concludes the description of the configuration of the discharge rate monitoring device 300. Hereinafter, the operation of the discharge rate monitoring device 300 will be described with reference to FIG.

[0057] Before a viscous fluid is supplied to the discharge rate monitoring device 300, as shown in FIG. 4(a), the check ball 130 is in contact with the set screw 120 due to the forces of the release spring 160 and the return spring 170. When a viscous fluid flows into the cylinder 110, the check ball 130 and the movable nozzle 150 move, similar to the first embodiment. As shown in FIG. 4(b), the check ball 130 comes into contact with the upstream end of the ball stopper pipe 340, restricting its movement, and only the movable nozzle 150 moves, similar to the first embodiment.

[0058] As the movable nozzle 150 moves alone, the pressure-receiving area of ​​the check ball 130 decreases, but at this time, the pressing force from the inner diameter hole of the ball stopper pipe 340 is still greater than the release spring 160, and the check ball 130 does not separate. When the movable nozzle 150 moves alone and the end face of the movable nozzle 150 reaches the upstream through-hole 340a, the pressure difference between the inlet 110a side and the outlet 110b side disappears, and the force of the release spring 160 separates the check ball 130 and the movable nozzle 150, opening the third flow path 152. Because the check ball 130 and the movable nozzle 150 separate with a sufficient distance maintained, even highly viscous fluids are not sealed by the check ball 130 during the return of the movable nozzle 150, and the movable nozzle 150 reliably reaches the bottom dead center. The return time is also short. Other operations are the same as in the first embodiment.

[0059] Even if the third flow path 152 cannot be opened due to damage to the release spring 160 or sticking of the check ball 130, the presence of the upstream through-hole 340a ensures that a flow path is maintained even in the worst case, and the fluid is discharged from the outlet 110b via the upstream through-hole 340a, thereby solving the above problem.

[0060] (Effects of the third embodiment) As described above, according to this embodiment, the movement restricting portion is the ball stopper pipe 340, which allows for a simple configuration.

[0061] Furthermore, by using the ball stopper pipe 340 as the movement restriction section, the movable nozzle 150 is not sealed by the check ball 130 during its return, and the movable nozzle 150 can be reliably returned to the bottom dead center in a short time.

[0062] Furthermore, since the entire periphery of the end face of the ball stopper pipe 340 can press the check ball 130, the check ball 130 will not open to one side (open diagonally).

[0063] (Modification of the third embodiment) If the ball stopper pipe 340 does not have an upstream through-hole 340a, the movement of only the movable nozzle 150 reduces the pressure-receiving area of ​​the check ball 130, and the force of the release spring 160 becomes greater, causing the check ball 130 to separate. Before the movement of the check ball 130 is restricted by the ball stopper pipe 340, the tip of the movable nozzle 150 provides a seal (large pressure-receiving area), and from the stopper portion onwards, the pipe inner diameter hole of the ball stopper pipe 340 provides a seal (small pressure-receiving area). In this modified example, the ball stopper pipe 340 does not have an upstream through-hole 340a, so the rigidity of the pipe is higher than in a case where the upstream through-hole 340a is provided.

[0064] (Fourth embodiment) The configuration of a discharge rate monitoring device 400 according to a fourth embodiment will be described with reference to Fig. 5. Fig. 5 is a diagram showing the configuration of the discharge rate monitoring device 400 of this embodiment. The discharge rate monitoring device 400 of this embodiment is for extremely small flow rates, and this embodiment differs from the third embodiment in the configuration of the movable nozzle 150, so this embodiment will be described mainly focusing on the differences from the third embodiment. Components having substantially the same functional configuration will be assigned the same reference numerals, and redundant explanations will be omitted.

[0065] The discharge rate monitoring device 400 is the same as the discharge rate monitoring device 300 of the third embodiment, except that a magnet 480 is provided at the downstream end of the movable nozzle 150, so that it slides integrally with the movable nozzle 150. The magnet 480 is configured in a doughnut shape and is slidably provided on the outer periphery of the ball stopper pipe 340. The gap between the magnet 480 and the ball stopper pipe 340 is optional, and sealing is not necessarily required. By providing the magnet 480 that slides integrally with the movable nozzle 150, if a magnetic sensor 490 is provided on the outside of the cylinder 110, for example, it is possible to detect the position of the magnet 480 and thereby detect the amount of movement of the movable nozzle 150.

[0066] (Effects of the fourth embodiment) As described above, according to this embodiment, by providing the magnet 480 that slides integrally with the movable nozzle 150, it is possible to measure the piston movement amount by a magnetic sensor.

[0067] (Fifth embodiment) The configuration of a discharge rate monitoring device 500 according to a fifth embodiment will be described with reference to Fig. 6. Fig. 6 is a diagram showing the configuration of the discharge rate monitoring device 500 of this embodiment. The discharge rate monitoring device 500 of this embodiment is for extremely small flow rates, and this embodiment differs from the fourth embodiment in the configuration of the check ball 530 and the movable nozzle 550, so this embodiment will be described mainly focusing on the differences from the fourth embodiment. Components having substantially the same functional configuration will be assigned the same reference numerals, and redundant explanations will be omitted.

[0068] As shown in Fig. 6, the discharge rate monitoring device 500 has the same shape as the check ball 130, movable nozzle 150, and release spring 160 of the fourth embodiment, but the check ball 530 and movable nozzle 550 are made of a magnetic material in order to increase the elastic force of the release spring 560. The check ball 530 is attracted to the movable nozzle 550, which is magnetized by the magnet 480, so the elastic force of the release spring 560 can be increased. Note that the magnet 480 is preferably a samarium-cobalt magnet, whose magnetic force changes little with temperature changes, and it is desirable that the parts other than the check ball 530 and magnet 480 be made of non-magnetic materials.

[0069] (Effects of the fifth embodiment) As described above, according to this embodiment, the check ball 530 is attracted by the magnetic force of the magnet 480, which increases the elastic force of the release spring 560. Therefore, even with hard grease, the check ball 530 is reliably released, and the movable nozzle 550 can be returned to the bottom dead center.

[0070] Furthermore, since the attractive force of the magnet 480 is inversely proportional to the square of the distance, the attractive force drops sharply as it moves away from the check ball 530, allowing it to reach the bottom dead center.

[0071] Furthermore, the check ball 530 can be attracted and held by the magnet 480, which prevents it from falling off and improves vibration resistance.

[0072] (Modification of the fifth embodiment) If the ball stopper pipe 340 were not provided with the upstream through-hole 340a, the pressure-receiving area of ​​the check ball 530 would decrease as only the movable nozzle 150 moved, but at this time the pressing force from the inner diameter hole of the ball stopper pipe 340 and the force of the magnet 480 attracting the check ball 530 would still be greater than the force of the release spring 560, and the check ball 530 would not separate. When only the movable nozzle 150 further moves and the force of the magnet 480 attracting the check ball 530 weakens, the check ball 530 separates and the third flow path 552 opens. With this configuration, the check ball 530 and the tip of the movable nozzle 550 can be separated while a sufficient distance is maintained between them.

[0073] (Sixth embodiment) The configuration of a discharge rate monitoring device 600 according to a sixth embodiment will be described with reference to Fig. 7. Fig. 7 is a diagram showing the configuration of the discharge rate monitoring device 600 of this embodiment. The discharge rate monitoring device 600 of this embodiment is for minute flow rates and differs from the fourth embodiment in the configuration of the cylinder 610, and therefore, the following description will focus on the differences from the fourth embodiment. Components having substantially the same functional configuration will be assigned the same reference numerals, and redundant description will be omitted.

[0074] The cylinder 610 of the discharge rate monitoring device 600 has a cylinder intermediate part 616 in which the check ball sliding part 112 and the movable nozzle sliding part 113 of the discharge rate monitoring device 400 of the fourth embodiment are integrated. The cylinder intermediate part 616 has the same diameter as the check ball sliding part 112 of the fourth embodiment, but is larger in diameter than the check ball sliding part 112. Note that as long as the sliding part for the O-ring 682 is secured, there is no functional problem even if the cylinder intermediate part 616 has a step.

[0075] The piston 680 is sealed to the circumferential surface of the cylinder middle section 616 by an O-ring 682. A notch 680a extending in the axial direction is formed in the piston 680. Providing the notch 680a makes it possible to ensure a flow path. If the notch 680a is small, resistance will be generated that pushes the fluid upstream of the check ball 130 downstream when the check ball 130 separates, resulting in poor separation performance. Furthermore, when the piston 680 descends, the resistance of the check ball 130 toward the movable nozzle 150 increases. By properly securing the notch 680a, the check ball 130 can be properly guided and held, and furthermore, fluid resistance can be reduced when the check ball 130 separates and when the piston 680 descends.

[0076] A check ball fall-out prevention portion 680b is formed at the upstream end of piston 680 by a protrusion that protrudes toward the center. Check ball fall-out prevention portion 680b turns the upstream end of piston 680 into a small-diameter hole, preventing check ball 130 from falling out. Note that check ball fall-out prevention portion 680b may be molded integrally with piston 680, or may be formed as a separate part. The downstream end of piston 680 is integrally fixed to the downstream end of movable nozzle 150 by press-fitting or adhesive so as to prevent leakage of viscous fluid and so that it will not come off piston 680 due to pressing force. Movable nozzle 550 is held so as to slide integrally with ball stopper pipe 340.

[0077] Furthermore, a pipe fall-off prevention cover 690 that slides integrally with the piston 680 is disposed adjacent to the downstream side of the piston 680. The upstream end of the pipe fall-off prevention cover 690 is bent radially outward, and the downstream end is bent toward the center. The return spring 170 is disposed across the upstream end of the pipe fall-off prevention cover 690 and the downstream end of the cylinder middle section 616. A magnet 480 is provided on the pipe fall-off prevention cover 690. Furthermore, a flow path 690a is formed in the pipe fall-off prevention cover 690 to smooth the inflow and outflow of fluid behind the magnet 480.

[0078] The following explains the advantage of being able to make the check ball 130 small in diameter despite the large diameter of the cylinder middle section 616. When the check ball has a large diameter, it becomes heavy, making it vulnerable to vibration and shock, and in the case of low-viscosity fluids, the shock at the time of separation increases, resulting in poor sealing performance. In addition, there is a possibility that the resistance received from the fluid when the check ball separates will be large, resulting in poor separation performance. In contrast, in this embodiment, the play of the check ball 130 is suppressed within the range where it can slide due to the inner diameter of the piston 680, making it resistant to vibration and shock.

[0079] The midstream through-hole 340c of the ball stopper pipe 340 facing the magnet 480 prevents stagnation of the viscous fluid on the inner diameter portion of the magnet 480 and the side surface of the ball stopper pipe 340.

[0080] (Effects of the sixth embodiment) As described above, according to this embodiment, by providing the piston 680 which holds the movable nozzle 150 and the check ball 130 and slides together as one unit, it is possible to increase the diameter of the cylinder middle section 616 without increasing the size of the check ball 130, and therefore it is possible to accommodate a large discharge rate.

[0081] Moreover, the specified discharge amount can be changed by changing the depth of the cylinder 110.

[0082] (Seventh embodiment) The configuration of a discharge rate monitoring device 700 according to a seventh embodiment will be described with reference to Fig. 8. Fig. 8 is a diagram showing the configuration of the discharge rate monitoring device 700 of this embodiment. This embodiment differs from the sixth embodiment in the configuration for returning the ball stopper pipe 340 to its return position, and the following description will focus on the differences from the first embodiment. Components having substantially the same functional configuration will be assigned the same reference numerals, and redundant description will be omitted.

[0083] Two examples for returning the ball stopper pipe 340 to the return position will be described. In the first example, as shown in Figure 8(a), a stopper pipe return magnet 780 (repulsion magnet) is provided on the pipe fixing bush 342. The stopper pipe return magnet 780 is a magnet that repels the magnet 480, and functions to forcibly return the ball stopper pipe 340 to the return position.

[0084] Next, a second example for returning the ball stopper pipe 340 to its return position will be described with reference to FIG. 8(b). In the second example, as shown in FIG. 8(b), a stopper pipe return spring 790 is provided between the pipe fixing bush 342 and the magnet 480. The stopper pipe return spring 790 acts to forcibly return the ball stopper pipe 340 to its return position by its elastic force. The stopper pipe return spring 790 can be, for example, a cylindrical spring, a conical spring, a curved spring, or a wave washer.

[0085] The ball stopper pipe 340 is subjected to a force returning to its return position due to the resistance of the fluid, but if the resistance is small it may not return, so the repulsive force of the stopper pipe return magnet 780 and the elastic force of the stopper pipe return spring 790 ensure that the ball stopper pipe 340 will return to its return position even if the resistance is small.

[0086] (Effects of the Seventh Embodiment) As described above, according to this embodiment, the repulsive force of the stopper pipe return magnet 780 and the elastic force of the stopper pipe return spring 790 can reliably impart a returning force to the ball stopper pipe 340 even when the resistance of the viscous fluid is small.

[0087] (Eighth embodiment) The configuration of a discharge rate monitoring device 800 according to an eighth embodiment will be described with reference to Fig. 9. Fig. 9 is a diagram showing the configuration of a discharge rate monitoring device 800 according to this embodiment. This embodiment differs from the sixth embodiment in the configuration of the set screw, and the following description will focus on the differences from the sixth embodiment. Components having substantially the same functional configuration will be assigned the same reference numerals, and redundant description will be omitted.

[0088] As shown in Fig. 9, the discharge rate monitoring device 800 of this embodiment is provided with a backflow prevention set screw 820 instead of the set screw 120 of the sixth embodiment. The backflow prevention set screw 820 is provided in a first flow path 824 and includes an opening / closing ball 827 that is capable of opening and closing the first flow path 824 by moving axially, and a biasing spring 828 that biases the opening / closing ball 827 in a direction that closes the first flow path 824. Note that although the backflow prevention set screw 820 is used in this embodiment, any type of check valve, such as a rubber check valve, may be used as long as it is a check valve. A check ball fall-out prevention ring 832 is provided at the upstream end of the piston 680 to prevent the check ball 130 from falling out.

[0089] When viscous fluid flows in from the inlet 110a, the opening / closing ball 827 moves against the biasing force of the biasing spring 828 to open the first flow path 824. Then, when the inflow of viscous fluid from the inlet 110a stops, the opening / closing ball 827 moves due to the biasing force of the biasing spring 828 to close the first flow path 824. Therefore, the backflow prevention set screw 820 prevents the movable nozzle 150 from descending except when the movable nozzle 150 reaches top dead center, the check ball 130 is released, and the fluid downstream of the opening / closing ball 827 is replaced by the cylinder middle part 616. In this way, the reliability of the movable nozzle 150 is improved, for example, by preventing the movable nozzle 150 from descending due to leakage in the piping connected to the inlet 110a.

[0090] (Effects of the eighth embodiment) As described above, according to this embodiment, the backflow prevention set screw 820 prevents the movable nozzle 150 from descending except when the movable nozzle 150 reaches top dead center, the check ball 130 is released, and the fluid on the mounting screw portion 111 side is replaced by the fluid on the cylinder middle portion 616 side, thereby improving the reliability of the movable nozzle 150.

[0091] (Modification of the eighth embodiment) A modified example of the eighth embodiment will be described with reference to Fig. 10. In this modified example, as shown in Fig. 10, a stopper pipe return spring 790 similar to that of the seventh embodiment is provided between the pipe fixing bush 342 and the magnet 480. The elastic force of the stopper pipe return spring 790 can reliably impart a returning force to the ball stopper pipe 340 even when the resistance of the viscous fluid is small.

[0092] (Ninth embodiment) The configuration of a discharge rate monitoring device 900 according to a ninth embodiment will be described with reference to Fig. 11. Fig. 11 is a diagram showing the configuration of the discharge rate monitoring device 900 of this embodiment. The discharge rate monitoring device 900 of this embodiment is for extremely small flow rates and differs from the sixth embodiment mainly in the configuration of the cylinder intermediate section 916 and the pipe drop-off prevention cover 690. In this embodiment, the differences from the first embodiment will be mainly described. Components having substantially the same functional configuration will be assigned the same reference numerals, and redundant description will be omitted.

[0093] As shown in Fig. 11, the discharge rate monitoring device 900 is provided with a small-diameter cylinder section 916a at the downstream end of a cylinder intermediate section 916. The tip of the ball stopper pipe 340 is inserted into the small-diameter cylinder section 916a. Furthermore, instead of the piston 680 of the sixth embodiment, a moving member 980 is provided which does not have an O-ring and is not subjected to the pressure of a piston. The moving member 980 is formed with a moving member first flow path 980a and a moving member second flow path 980b which communicate from upstream to downstream. The moving member second flow path 980b communicates with a pipe fall-off prevention cover / piston 990.

[0094] Furthermore, instead of the pipe fall-off prevention cover 690 of the sixth embodiment, a pipe fall-off prevention cover / piston 990 is provided, which functions as both a pipe fall-off prevention cover and a piston. The upstream end of the pipe fall-off prevention cover / piston 990 is press-fitted to the movable nozzle 150 to form an integrated unit. Its functions are to hold the movable nozzle 150 and to move the movable nozzle 150 using the return spring 170. The downstream side of the pipe fall-off prevention cover / piston 990 forms a piston portion 990a that bends toward the center and then extends axially. The piston portion 990a is slidably fitted around the outer periphery of the ball stopper pipe 340. The outer periphery of the piston portion 990a is sealed with an O-ring 992 and slidably fitted into the small-diameter cylinder portion 916a, forming a piston with variable volume. The O-ring 992 is prevented from falling off by an O-ring retainer lid 994 provided at the downstream end of the cylinder intermediate portion 916. The piston portion 990a also has the function of opening and closing the upstream through-hole 340a of the ball stopper pipe 340 by sliding.

[0095] Additionally, an upstream oil passage 990b and a downstream oil passage 990c are formed by penetrating the wall at the upstream end and downstream end of pipe falling-off prevention cover / piston 990. Magnet 480 is fixed to the inner circumferential surface of pipe falling-off prevention cover / piston 990, and is disposed in contact with movable nozzle 150.

[0096] When viscous fluid flows into the cylinder middle section 916, a change in volume causes the moving member 980, movable nozzle 150, pipe fall-off prevention cover / piston 990, and ball stopper pipe 340 to slide together. When the ball stopper pipe 340 abuts against the downstream end of the small-diameter cylinder section 916a, further movement is restricted, so only the movable nozzle 150 and pipe fall-off prevention cover / piston 990 slide. When the pipe fall-off prevention cover / piston 990 slides and the upstream through-hole 340a communicates with the cylinder middle section 916, the pressure difference acting on the check ball 130 disappears, and it separates.

[0097] (Effects of the ninth embodiment) As described above, according to this embodiment, the return spring 170 and the magnet 480 can be installed outside the small diameter cylinder portion 916a, which allows for a high degree of freedom in design.

[0098] Since the volume change occurs in the small diameter cylinder portion 916a, the movable nozzle 150 can be moved a large distance with a small flow rate.

[0099] (First modified example of the ninth embodiment) A first modified example of the ninth embodiment will be described with reference to FIG. 12. FIG. 12 is a diagram showing the first modified example of the ninth embodiment. In the first modified example, as shown in FIG. 12, a backflow prevention set screw 820 similar to that of the eighth embodiment is provided instead of the set screw 120. The upstream end of the pipe fall-off prevention cover / piston 990 is fixed to the movable nozzle 150 by press-fitting. A groove is cut in the center of the downstream end of the movable nozzle 150 like the head of a flathead screw, forming a downstream end flow path 150b, which communicates with the pipe fall-off prevention cover / piston 990. This allows for smooth movement of fluid inside and outside the pipe fall-off prevention cover / piston 990 when the pipe fall-off prevention cover / piston 990 descends.

[0100] (Second modified example of the ninth embodiment) A second modified example of the ninth embodiment will be described with reference to Fig. 13. Fig. 13 is a diagram showing the second modified example of the ninth embodiment. As shown in Fig. 13, in the second modified example, the downstream end of the ball stopper pipe 940 is bent radially outward to form a bent portion 940b, and a stopper pipe return spring 790 is provided between the downstream end of the pipe fall-off prevention cover / piston 990 and the bent portion 940b, as in the seventh embodiment.

[0101] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention.

[0102] For example, in the fourth embodiment, the movable nozzle 150 and the magnet 480 are configured as separate bodies, but the present invention is not limited to this example. For example, the movable nozzle and the magnet may be configured as an integrated unit. Furthermore, the movable nozzle itself may be configured as a magnet.

[0103] Furthermore, in the fifth embodiment, a samarium-cobalt magnet, whose magnetic force changes little with temperature, is used as magnet 480, but the present invention is not limited to this example. By employing a ball stopper pipe, a sufficient distance can be secured between the upstream end of the movable nozzle and the check ball, so the relationship between the magnetic attraction force and the release spring does not need to be strict. Therefore, the magnet is not limited to a samarium-cobalt magnet.

[0104] Furthermore, in the fifth embodiment, the check ball 530 is made of a magnetic material, but the present invention is not limited to this example. Any design is possible as long as it is possible to seal the gap between the check ball and the movable nozzle. For example, the check ball itself may be a magnet. [Explanation of symbols]

[0105] 100, 200, 300 Discharge rate monitoring device 110, 610 cylinder 110a Inlet 110b Outlet 111 Mounting screw part 112 Check ball sliding part 113 Movable nozzle sliding part 114 Second Channel 115 Outlet side flow path 120 set screw 122 Contact part 124, 824 First channel 124a Center side flow path 124b, 824b Outer surface side flow path 126 screws 130, 530 Check ball (first moving member) 140 Ball stopper part (movement restriction part) 150, 550 Movable nozzle (second moving member) 150a Tip 150b downstream end flow path 152, 552 Third channel 160 Open spring (first moving member open spring) 170 Return spring 240 Ball stopper pin (movement restriction part) 242 Pin section 244 Bottom 246 Aperture 340, 940 Ball stopper pipe (movement restriction part) 340a Upstream through hole 340b Downstream through hole 340c Midstream side through hole 342 Pipe fixing bush 480 Magnet 616, 916 Cylinder middle section 680 Piston 680a Notch 680b Check ball fall prevention part 682, 992 O-rings 690 Pipe fall prevention cover 690a flow path 780 Stopper pipe return magnet (repulsion magnet) 790 Stopper pipe return spring 820 Backflow prevention set screw 827 Opening and Closing Ball 828 bias spring 832 Check ball fall prevention ring 916a Small diameter cylinder part 940b Bending part 980 Moving parts 980a Moving member first flow path 980b Moving member second flow path 990 Pipe fall prevention cover and piston 990a Piston part 990b Upstream oilway 990c Downstream oilway 994 O-ring retaining lid

Claims

1. A discharge amount monitoring device that monitors whether a specified amount of fluid has been discharged, a cylinder having a fluid inlet and outlet; a first moving member that is movable within the cylinder; a second flow path through which a fluid flows from the inlet side to the outlet side along a side of the first moving member; a movement restricting portion that restricts movement of the first moving member beyond a predetermined limit; a second moving member disposed downstream of the first moving member, movable within the cylinder, and having a third flow path through which fluid flows from the inlet side to the outlet side; a first moving member opening spring that biases the first moving member and the second moving member in a direction separating them from each other; a return spring that biases the second moving member toward the inlet; Equipped with A discharge amount monitoring device, characterized in that after the movement of the first moving member is restricted by the movement restricting portion, only the second moving member moves and separates from the first moving member.

2. 2. The discharge amount monitoring device according to claim 1, wherein the first moving member is a check ball movably fitted in the cylinder.

3. 2. The discharge amount monitoring device according to claim 1, wherein the movement restricting portion is formed by a protruding portion that protrudes from the inner periphery of the cylinder toward the center.

4. 2. The discharge amount monitoring device according to claim 1, wherein the movement restricting portion is a ball stopper pin extending axially within the cylinder.

5. 2. The discharge amount monitoring device according to claim 1, wherein the movement restricting portion is a cylindrical ball stopper pipe that is fitted onto an inner peripheral surface of the third flow path so that the first moving member can move.

6. 6. The discharge amount monitoring device according to claim 5, wherein an oil passage is formed in the ball stopper pipe, passing through a wall portion thereof.

7. a magnet that moves integrally with the second moving member is provided on the outer periphery of the ball stopper pipe; 6. The discharge amount monitoring device according to claim 5, wherein a magnetic discharge amount monitoring device for detecting the position of the magnet is provided outside the cylinder.

8. the ball stopper pipe is movable within the cylinder, the cylinder has a ball stopper pipe movement restricting portion that restricts movement of the ball stopper pipe to a predetermined amount or more, 6. The discharge volume monitoring device according to claim 5, wherein the second moving member moves integrally with the ball stopper pipe until the movement of the ball stopper pipe is restricted by the ball stopper pipe movement restricting portion, but after the movement is restricted, the second moving member moves relative to the ball stopper pipe.

9. a magnet that moves integrally with the second moving member is provided; 9. The discharge amount monitoring device according to claim 8, wherein the cylinder or the ball stopper pipe is provided with a repulsive magnet that repels the magnet near the top dead center of the first moving member.

10. 9. The discharge amount monitoring device according to claim 8, wherein the cylinder or the ball stopper pipe is provided with a stopper pipe return spring that returns the first moving member to a return position near the top dead center.

11. 2. The discharge amount monitoring device according to claim 1, further comprising a check valve provided upstream or downstream of the first moving member for preventing a fluid from flowing back from the outlet toward the inlet.

12. a cylinder small diameter portion having a diameter smaller than that of the second moving member is provided in the vicinity of the outflow port of the cylinder, a tip of the ball stopper pipe is movably disposed in the cylinder small diameter portion, 9. The discharge amount monitoring device according to claim 8, wherein the small diameter portion of the cylinder has a portion for restricting movement of the ball stopper pipe.

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