JP2022017813A - Flow detector and fluid injection device - Google Patents

Abstract

To provide a flow detector and a fluid injection device that can increase the accuracy of detecting a flow.SOLUTION: The present invention includes a pipe in which a fluid is circulated and a pressure sensor in the pipe. Detecting a pressure change in a fluid circulating in the pipe by a pressure sensor and detecting a flow make it possible to detect, without fail, the presence or absence of a circulating fluid without being affected by false operations caused for various reasons including operational failures of a float that can happen when the float is used, and therefore the accuracy of detecting a flow can be increased.SELECTED DRAWING: Figure 1

Description

The present invention relates to a galvanometer and a fluid injection device installed in a fluid injection device for injecting a fluid such as sodium hypochlorite, and is particularly devised so as to improve the accuracy of the flow detection. Regarding things.

For example, Patent Document 1 discloses the configuration of this type of galvanometer. The galvanometer described in Patent Document 1 has the following configuration. First, there is a pipeline, and this pipeline is provided with a throttle portion. The throttle portion is equipped with a float that can be raised and lowered. The float moves up and down due to the flow of fluid in the pipeline. Further, an optical sensor is attached to the outside of the pipeline, and the optical sensor detects whether or not the float is floating, that is, the presence or absence of fluid flow.

Japanese Unexamined Patent Publication No. 2007-278777

According to the above-mentioned conventional configuration, there are the following problems.
First, there was the problem that it was greatly affected by the movement of the float. That is, it is configured to detect the flow depending on whether or not the optical path is blocked by the float, and it is premised that the operation of the float is accurate. However, the normal operation of the float may be impaired due to dirt on the pipeline and the float, adhesion of air, and the like. For example, even though there is no fluid flow, the float remains floating due to the above phenomenon, and as a result, the optical path is not blocked and there is a fluid flow, resulting in a false detection. ..

The present invention has been made based on such a point, and an object thereof is to enable accurate inspection without being influenced by the movement of the float, and to improve the inspection accuracy. It is an object of the present invention to provide a fluid injection device having a galvanometer and such a galvanometer.

In order to achieve the above object, the flow detector according to claim 1 of the present invention is characterized by comprising a pipeline through which a fluid flows and a pressure sensor installed in the pipeline.
Further, in the galvanometer according to claim 2, in the galvanometer according to claim 1, a valve for amplifying a pressure change at the pressure detection position is provided on the secondary side of the pressure detection position by the pressure sensor in the pipeline. It is characterized by being provided.
Further, the fluid detector according to claim 3 is the fluid detector according to claim 2, wherein the valve is a housing, a valve seat provided on the upstream side in the housing, a valve body housed in the housing, and the valve body. It is composed of an elastic member that urges the valve body to the valve seat side, and the pressure of the fluid causes the valve body to move in a direction away from the valve seat against the elastic force of the elastic member, and the fluid is released. It is characterized in that it can pass through the inside of the valve.
Further, in the galvanometer according to claim 4, in the galvanometer according to any one of claims 1 to 3, a float is installed on the primary side of the pressure detection position by the pressure sensor in the pipeline. It is characterized by being present.
Further, the fluid injection device according to claim 5 includes a pump for sucking and discharging a fluid, and a flow detector according to any one of claims 1 to 4 installed on the discharge side of the pump. It is characterized by that.

As described above, according to the flow detector according to claim 1 of the present invention, a pipeline through which the fluid flows and a pressure sensor installed in the pipeline are provided, so that the flow detection accuracy can be improved. Can be done.
Further, according to the galvanometer according to claim 2, in the galvanometer according to claim 1, a valve that amplifies the pressure change at the pressure detection position on the secondary side of the pressure detection position by the pressure sensor in the pipeline. Is provided, so that the flow detection accuracy can be further improved.
Further, the fluid detector according to claim 3 is the fluid detector according to claim 2, wherein the valve is a housing, a valve seat provided on the upstream side in the housing, a valve body housed in the housing, and the valve body. It consists of an elastic member that urges the valve body to the valve seat side, and the pressure of the fluid causes the valve body to move in a direction away from the valve seat against the elastic force of the elastic member, and the fluid is released. Since it can pass through the valve, it is possible to physically amplify the amount of change in the pressure of the fluid at the pressure detection position in the flow detector, which leads to the accuracy of pressure detection and thus the flow detection accuracy. The accuracy can be improved.
Further, according to the galvanometer according to claim 4, in the galvanometer according to any one of claims 1 to 3, a float is installed on the primary side of the pressure detection position by the pressure sensor in the pipeline. Therefore, the flow can be visually detected.
Further, according to the fluid injection device according to claim 5, a pump for sucking and discharging a fluid and a galvanometer according to any one of claims 1 to 4 installed on the discharge side of the pump are provided. Therefore, it is possible to improve the flow detection accuracy.

It is a figure which shows the 1st Embodiment of this invention, and is the front view of the fluid injection apparatus which shows the main part partially as a cross section. It is a figure which shows the 1st Embodiment of this invention, and is the II-II sectional view of FIG. It is a figure which shows the 1st Embodiment of this invention, is a sectional view III-III of FIG. It is a figure which shows the 2nd Embodiment of this invention, and is the front view of the fluid injection apparatus which shows the main part as a cross section partially. It is a figure which shows the 2nd Embodiment of this invention, and is the VV sectional view of FIG. It is a figure which shows the 2nd Embodiment of this invention, and is a schematic diagram for explaining the pumping action by a plunger in the order of operation.

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, the fluid injection device 1 according to the first embodiment includes a pump 3 and a galvanometer 5.

The pump 3 has a base 7 as shown in FIGS. 1 and 2. An induction motor 13 is installed on the upper side of the base 7 in the figure. A gear head (reducer) 15 is connected to the induction motor 13. An output shaft (not shown) of the induction motor 13 is connected to an input shaft (not shown) of the gear head 15. The cam 19 is fixed to the output shaft 17 of the gear head 15 in an eccentric state. A housing 21 is attached to the outer peripheral side of the cam 19 so as to be movable up and down. The rotation of the output shaft 17 of the gear head 15 causes the cam 19 to rotate, whereby the housing 21 moves up and down. Further, a ring ball 27 is connected to the lower end of the housing 21 via a set screw 23 and a lock nut 25.

On the other hand, the body 33 is fixed to the lower side of the base 7 in the figure by a plurality of bolts 31. A gland nut 35 is fixed to the central portion of the body 33 by screwing, and the gland nut 35 penetrates the base 7 and protrudes upward in the drawing, and is on the inner peripheral side thereof. Has a sleeve 37 inside.

Further, an outer pipe 41 is attached to the lower portion of the central portion of the body 33. The middle pipe 43 is coaxially installed on the inner peripheral side of the outer pipe 41. A rod 45 is installed on the inner peripheral side of the middle pipe 43 so as to be movable up and down. The upper end of the rod 45 is connected to the ring ball 27 described above. When the housing 21 reciprocates in the vertical direction, the rod 45 reciprocates in the vertical direction via the ring ball 27.

A pump head 53 fixed to a flange 55 by a fixing screw 57 is connected to the lower end of the outer pipe 41. A sleeve 58 is installed in the pump head 53, and a plunger 59 is installed on the inner peripheral side of the sleeve 58 so as to be able to reciprocate in the vertical direction. The upper end of the plunger 59 is connected to the lower end of the rod 45. When the housing 21 reciprocates in the vertical direction, the rod 45 reciprocates in the vertical direction via the ring ball 27, and the plunger 59 reciprocates in the vertical direction.

A strainer body 61 is connected below the pump head 53, and an element 63 is externally attached to the strainer body 61. Further, a suction flow path 65 is formed in the pump head 53, and a ball check 67 is installed at the tip of the suction flow path 65. The chemical solution sucked through the element 63 is sucked into the suction flow path 65 via the ball check 67.

A discharge flow path 71 is formed in the pump head 53, and another ball check 73 is installed in the discharge flow path 71. A liquid feed pipe 74 is connected to the discharge port of the discharge flow path 71 via a valve retainer 75. The liquid feed pipe 74 passes through the through hole 77 of the flange 55 and extends upward in FIG. 2 through the through hole 81 of the pipe steady rest 79 attached to the outer pipe 41.

A through hole 91 is formed in the body 33, and the upper end portion of the liquid feeding pipe 74 is inserted into the through hole 91. Further, a socket 93 is attached to the tip of the inserted liquid feeding pipe 74.

A liquid feed flow path 101 is formed in the base 7 described above, and the tip of the liquid feed pipe 74 communicates with the liquid feed flow path 101 via the socket 93. The opening at the tip (left end in FIG. 1) of the liquid feed flow path 101 is closed by the closing plug 103.

Next, the configuration of the galvanometer 5 will be described. First, a transparent visual tube 105 is installed on the base 7 via a joint sleeve 107. The liquid feeding flow path 109 is formed in the joint sleeve 107, and the liquid feeding flow path 111 is also formed in the visual inspection tube 105. The liquid feed flow path 101 communicates with the liquid feed flow paths 109 and 111. As shown in FIG. 3, a float 113 made of a ceramic ball is housed in the liquid feeding flow path 111 so as to be movable in the vertical direction. Further, the air bleeding flow path 115 is branched in the direction orthogonal to the liquid feeding flow path 111, and the air bleeding valve 117 is attached to the opening of the air bleeding flow path 115.

When the lower middle side of FIG. 3 of the liquid feeding flow path 111 is reduced in diameter to form a step portion 119, and there is a flow of the chemical liquid from the lower middle to the upper side of FIG. 3 in the liquid feeding flow path 111. The float 113 floats, but is seated on the step portion 119 when there is no flow of the chemical solution. Further, the visual tube 105 is made of a transparent material such as acrylic, and the movement of the float 113 can be visually recognized from the outside.

As shown in FIG. 1, the inspection flow path 121 is branched from the liquid supply flow path 111 provided in the visual inspection tube 105, and the pressure sensor 123 is attached to the opening of the inspection flow path 121. The pressure sensor 123 is fixed to the visual inspection tube 105 by a plurality of bolts 125. The pressure sensor 123 detects the pressure in the liquid feed flow path 111 via the inspection flow path 121, thereby detecting the presence or absence of the flow of the chemical solution.
The pressure sensor 123 may have various configurations, but in the case of the present embodiment, a pressure sensor 123 manufactured by Hamamatsu Photoelectric Co., Ltd. with a model number of "KH18001 MPa" is used as an example.

A valve 131 for amplifying a pressure change is installed above the visual tube 105 in the figure. The valve 131 has a hose socket 133 that also functions as a housing for the valve 131, and the hose socket 133 is formed with a liquid feeding flow path 135 extending in the vertical direction in FIG. The lower side of the liquid feeding flow path 135 in FIG. 3 is expanded in diameter to form a valve body accommodating portion 137. A valve valve 139 is installed in the valve body accommodating portion 137. The valve valve 139 is pressed downward in FIG. 3 by a valve spring 141. A valve seat 143 is installed below the valve valve 139. When the valve valve 139 is pressed by the valve spring 141 and seated on the valve seat 143, the liquid feed flow path 135 is blocked. When the valve valve 139 moves upward in FIG. 3 against the elastic force of the valve spring 141 due to the chemical pressure, the chemical flows in the liquid feed flow path 135. By providing the valve 131 having such a configuration on the downstream side of the pressure detection position by the pressure sensor 123 described above, the pressure change at the pressure detection position so as to add a predetermined resistance to the fluid in the liquid feed flow path 111. Amplifies.

A hose 151 is connected to the downstream side (upper side in FIG. 3) of the valve 131 by a hose nut 153.

Next, the operation by this first embodiment will be described.
First, the induction motor 13 rotates the cam 19 via the gear head 15. The rotation of the cam 19 causes the housing 21 to reciprocate in the vertical direction. Due to the reciprocating movement of the housing 21, the rod 45 and the plunger 59 reciprocate in the vertical direction via the ring ball 25.

When the plunger 59 rises, the ball check 67 is opened, and the chemical solution in the tank (not shown) is sucked into the suction flow path 65. Next, when the plunger 59 is lowered, the ball check 67 is closed and the ball check 73 on the discharge flow path 71 side is opened instead. As a result, the chemical liquid sucked into the suction flow path 65 is discharged to the discharge flow path 71 side, passes through the ball check 73, and is discharged into the liquid delivery pipe 74.
Hereinafter, when the plunger 59 reciprocates in the vertical direction, the above action is repeated and the drug solution is pulsatilely discharged.

The chemical liquid discharged into the liquid feeding pipe 74 is sent out into the hose 151 via the liquid feeding flow path 101, the liquid feeding flow path 111, and the liquid feeding flow path 135, and is sent to the target chemical liquid injection point. Is injected.

Further, the pressure in the liquid feeding flow path 111 is detected by the pressure sensor 123 via the inspection flow path 121. If the amount of change in pressure in the liquid feed flow path 111 is equal to or greater than a predetermined value, it is determined that the chemical solution is in circulation, and if it is less than the predetermined value, it is determined that the chemical solution is not in circulation.

At that time, since the valve 131 is configured to add a predetermined resistance to the fluid in the liquid feed flow path 111, the amount of change in pressure between the case with the flow of the chemical solution and the case without the flow of the chemical solution is physically determined. Can be amplified. Thereby, the accuracy of the pressure detection by the pressure sensor 123 and the accuracy of the flow detection accuracy are improved.

Since the float 113 floats when the chemical liquid flows in the liquid feeding flow path 111, it can be visually recognized from the outside of the visual tube 105.

Next, the effect of this first embodiment will be described.
First, it is possible to improve the flow detection accuracy. This is because the flow is detected by the pressure sensor 123, and the presence or absence of chemical flow can be reliably detected without being affected by the malfunction of the float 113 due to various reasons.
Further, since the valve 131 is provided on the downstream side of the pressure detection position by the pressure sensor 123, it is possible to amplify the pressure change with and without the chemical flow, thereby the pressure sensor 123. The detection accuracy can be further improved.
Further, since the float 113 is also installed, it is possible to visually inspect the flow from the outside.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5.
The fluid injection device 201 according to the second embodiment employs a pump 203 having a configuration different from that of the fluid injection device according to the first embodiment.

The pump 203 has a base 207, and a cam cover 209 is installed on the upper side of the base 207 in FIG. The upper side of the cam cover 209 is a motor mounting plate 210. An induction motor 211 is installed on the upper side of FIG. 4 of the cam cover 209, and a gear head (reducer) 213 is connected to the induction motor 211. An output shaft (not shown) of the induction motor 211 is connected to an input shaft (not shown) of the gear head 213.

A plurality of stud bolts 215 are attached to the upper side of the base 207 in FIG. 4 and in the cam cover 209. A bearing holder 217 is attached to the upper side of the stud bolt 215. Further, a plurality of stud bolts 219 are attached to the upper side of the bearing holder 217 in FIG. 4, and the upper end of the stud bolt 219 (the upper end in FIG. 4) is fixed to the motor mounting plate 210.

The upper cam 221 is installed on the lower side in FIG. 4 of the bearing holder 217, and the lower cam 223 is installed on the upper side of the base 207. An upper cam surface 225 is formed on the lower side of the upper cam 221 in FIG. 4, and the lower cam surface has an inclined surface for raising and lowering a spline shaft, a rod, and a plunger, which will be described later, and an inclination for lowering. It is composed of a surface and a pair of flat surfaces for rotating only. A lower cam surface 227 is formed on the upper side of the lower cam 223 in FIG. 4, and the lower cam surface 227 also has an inclined surface for raising and lowering a spline shaft, a rod, and a plunger, which will be described later, for lowering. It is composed of an inclined surface and a pair of flat surfaces for only rotation. The distance between the upper cam surface 225 and the lower cam surface 227 in the vertical direction in FIG. 4 is equal.

Further, a roller bearing 231 is installed in the bearing holder 217, and a spline nut 233 is installed in the roller bearing 231. The spline nut 233 is rotatable with respect to the bearing holder 217. The spline nut 233 is connected to the output shaft 239 of the gear head 213 via a joint 240. Further, the spline shaft 235 is installed so as to penetrate the bearing holder 217, the upper cam 221 and the lower cam 223, and the base 207. The spline shaft 235 meshes with the spline nut 233, is rotatable together with the spline nut 233, and is installed so as to be reciprocating in the vertical direction in FIG.

A cam follower 237 is fixed to the spline shaft 235. The tip end side (left side in FIG. 4) of the cam follower 237 is interposed between the upper cam surface 225 and the lower cam surface 227.

Then, the gear head 213 is rotated by the induction motor 211, the spline nut 233 is rotated via the joint 240, and the spline shaft 235 is rotated. Further, the spline shaft 235 is reciprocated in the vertical direction while rotating by the action of the cam follower 237, the upper cam surface 225, and the lower cam surface 227.

A hollow cylindrical body pipe 243 is installed on the lower side of the base 207 in FIG. 4 via a coupling 241. A rod 245 is installed in the body pipe 243. The upper end of the rod 245 is connected to the lower end of the spline shaft 235. An O-ring 247 is installed in a portion of the coupling 241 through which the rod 245 penetrates.

A pump head 251 fixed via a flange 257 installed on the body pipe 243 is connected to the tip end side (lower side in FIG. 4) of the body pipe 243. The pump head 251 is provided with a suction port 253 and a discharge port 255. A strainer body 254 is attached to the suction port 253. Further, a plug 256 is attached to the tip of the pump head 251.

A plunger 261 is installed from the tip end side (lower side in FIG. 4) of the body pipe 243 to the inside of the pump head 251. The plunger 261 is connected to the tip end side (lower side in FIG. 4) of the rod 245 via the plunger holder 263, rotates via the spline shaft 235 and the rod 245, and reciprocates in the vertical direction.

A notch 265 is formed in a predetermined angle range along the rotation direction on the tip end side (lower side in FIG. 4) of the plunger 261, and the suction port is formed by the rotation of the plunger 261 and the reciprocating movement in the vertical direction. The chemical solution is sucked into the notch 265 from 253 and discharged from the notch 265 to the discharge port 255 side.

The same liquid feed pipe 74 as in the case of the first embodiment is connected to the discharge port 255 of the pump head 251 via the valve holder 267. Further, a ball check 269 is connected to the liquid feeding pipe 74 side of the valve holder 267.
The other configurations are the same as those in the first embodiment, and the same parts in the drawings are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation in the case of this second embodiment will be described.
When the spline nut 233 is rotated by the induction motor 211 of the pump 203 via the gear head 213 and the joint 240, the spline shaft 235, the rod 245, and the plunger 261 are rotated, and the upper cam surface 225 and the lower cam surface 227 are rotated. By the action of the cam follower 237, it reciprocates in the vertical direction in FIG.

Hereinafter, a detailed description will be given with reference to FIG.
First, the plunger 261 is in the state of the bottom dead center shown in the state a. That is, it has descended to the lowest point of the plunger 261 and the notch 265 is located at an intermediate position between the suction port 253 and the discharge port 255 of the pump head 251.
From that state, only the plunger 261 is rotated and the state b is entered. At this stage, the plunger 261 is still lowered to the lowest point, but the notch 265 is slightly facing the suction port 253 side of the pump head 251. In this state, the drug solution begins to flow into the notch 265 through the suction port 253.
When the plunger 261 is further rotated from that state, the plunger 261 rises as shown in the states c and d, whereby the chemical solution is sucked into the pump head 251. In state d, the plunger 261 has risen to the highest point.
After that, only the rotation of the plunger 261 is performed, and the state shifts to the top dead center state of the state e. The notch 265 is located at an intermediate position between the suction port 253 and the discharge port 255 of the pump head 251 (an intermediate position opposite to the intermediate position described above). By the operation up to this point, the suction of the chemical solution is completed.
From that state, only the plunger 261 is rotated and the state f is entered. At this stage, the plunger 261 is still raised to the highest point, but the notch 265 is slightly facing the discharge port 255 side of the pump head 251.
When the plunger 261 is further rotated from that state, the plunger 261 descends as shown in the state g and the state h, whereby the chemical solution in the pump head 251 is discharged through the discharge port 255. .. In state h, the plunger 261 has descended to the lowest point.
Hereinafter, by repeating the same action, the chemical solution is pulsatilely discharged from the discharge port 255.

The galvanometer action in the galvanometer 5 and the side effect of increasing the pressure change due to the valve 131 are the same as in the case of the first embodiment.

Therefore, the same effect as that of the first embodiment can be obtained, and there is an advantage that the check valve on the suction port side is not required in the pump.

The present invention is not limited to the first embodiment and the second embodiment.
First, the type of pressure sensor is not particularly limited.
Further, the structure of the valve is not limited to the one shown in the figure, and may be, for example, a diaphragm type.
In addition, the installation of floats is optional.
In addition, the illustrated configuration is just an example.

The present invention relates to a flow detector and a fluid injection device attached to a fluid injection device for injecting a fluid such as sodium hypochlorite, and particularly to a device devised so as to improve the flow detection accuracy. For example, it is suitable for a fluid injection device that injects sodium hypochlorite for sterilization of tap water.

1 Fluid injection device 3 Pump 5 Galvanometer 123 Pressure sensor 113 Float 131 Valve 201 Fluid injection device 203 Pump

Claims (5)

The pipeline through which the fluid flows and
With the pressure sensor installed in the above pipeline,
A galvanometer characterized by being equipped with. In the galvanometer according to claim 1,
A galvanometer characterized in that a valve for amplifying a pressure change at the pressure detection position is provided on the secondary side of the pressure detection position by the pressure sensor in the pipeline. In the galvanometer according to claim 2,
The valve is composed of a housing, a valve seat provided on the upstream side in the housing, a valve body housed in the housing, and an elastic member for urging the valve body to the valve seat side.
The inspection characterized in that the valve body is moved in a direction away from the valve seat by the pressure of the fluid against the elastic force of the elastic member so that the fluid can pass through the valve. Fluid. In the galvanometer according to any one of claims 1 to 3.
A galvanometer characterized in that a float is installed on the primary side of the pressure detection position by the pressure sensor in the pipeline. A pump that sucks and discharges fluid and
The galvanometer according to any one of claims 1 to 4, which is installed on the discharge side of the pump.
A fluid injection device characterized by being equipped with.

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