JP2694307B2 - Piping unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

 "Object of the invention"

[Industrial applications]

The pipe unit of the present invention is mainly used for the discharge pipe of a pump, but it can also be used for the suction pipe of a pump, and further relates to a pipe unit that can be used for the pipe of an air conditioner, a refrigerator, etc. Is.

[Prior Art and Problems to be Solved by the Invention]

FIG. 8 is an external view showing an example of a discharge pipe of a conventional pump. In FIG. 8, 21 is a pump, 22 is a reducer, 23 is a flexible joint, 24 is a check valve, 25 is a short pipe, 26
Is a butterfly valve, 27 is a pipe, and the short pipe 25 is a thermometer.
28 and pressure gauge 29 are attached. Fluid such as water discharged from the pump 21 is
Also, the check valve 24 is pushed open through the flexible joint 23 and flows into the short pipe 25. When the butterfly valve 26 is opened, fluid such as water is discharged through the butterfly valve 26 and the pipe 27. In this state, the flow rate can be adjusted by adjusting the opening of the butterfly valve 26. The thermometer 28 and the pressure gauge 29 indicate the temperature and pressure of a fluid such as water. When the rotation of the pump 21 is stopped, water or the like in the discharge pipe starts to backflow, but the check valve 24 is closed to prevent backflow.
When stopping the pump 21 for a long time, the butterfly valve 26
To prevent backflow. In such a conventional structure, after the pump 21 is installed, the length of the short pipe 25 or the pipe 27 is determined and cut in the field, the short pipe 25 is provided with the pipe flanges 25a and 25b, and the pipe 27 is provided with the pipe flange. In order to screw in or weld 27a for connection, it was common to perform thread cutting work or welding work to assemble. For this reason, it is necessary to perform cutting, thread cutting, and welding work on the site, which is troublesome and costly, and the work is difficult to perform. Further, due to the fact that cutting, processing, welding, etc. are carried out on-site in this way, a perfect anticorrosion structure could not be obtained, which also caused a problem of red water. The piping unit of the present invention is for solving these conventional problems. "Configuration of the Invention"

[Means for Solving the Problems]

The piping unit of the present invention is configured as follows in order to solve the above-mentioned conventional problems. A piping unit used for pump discharge piping,
The piping unit is configured by connecting a butterfly valve, a check valve and a pipe portion by flanges or screws, and providing standard pipe flanges or pipe screws at both ends thereof. Make adjustments,
The non-return valve prevented backflow without generating a water hammer, and the pipe part was equipped with instruments such as a pressure gauge, a thermometer, and a flowmeter. It is preferable to form a butt step surface at the connecting position of one end or both ends of the above-mentioned butterfly valve or check valve to form a centering structure. In this case, after attaching the piping unit to the discharge piping of the pump or the like, the butterfly valve and the check valve alone are
It may be possible to remove it from the piping unit for maintenance or the like. Further, the pipe portion of the piping unit may include a flexible joint or a reducer. Furthermore, a resin coating may be applied to the inner surface of the pipe portion of the piping unit to form an anticorrosion structure together with the butterfly valve and the check valve.

[Operation]

First, connect this piping unit to the discharge side of the pump,
When connecting the water supply pipe to the water tank to this pipe unit, the water discharged from the pump passes through the reducer and the flexible joint if these are provided, and also passes through the check valve, and further, the pressure gauge, It is sent to a water tank through a pipe part equipped with instruments such as a thermometer and a flow meter, a butterfly valve in an open state, and a water supply pipe. In this case, instruments such as a thermometer, a pressure gauge, and a flow meter are attached as needed, and these indicate the state of fluid such as water flowing in the piping unit. The reducer is for compensating for the difference in diameter between the discharge side of the pump and the piping unit, and the flexible joint is for misalignment of the pump, piping unit, water supply piping, etc. Change in dimensions of
Alternatively, it is for absorbing vibration and the like. Further, since standard pipe flanges or pipe screws of JIS, ANSI, etc. are provided at both ends of this piping unit, it can be easily connected to the front and rear pipe parts such as the pump and the water supply pipe as they are. Moreover, since the butterfly valve that can open and close and adjust the flow rate and the check valve that prevents the backflow without generating a water hammer are components, it is possible to flow and shut off the fluid and adjust the flow rate. When a backflow is about to occur due to the pump stopping, the backflow can be prevented without causing a water hammer. As such a check valve, a dual plate type check valve equipped with a spring is convenient. Since the piping unit of the present invention is integrally configured to have such a function, it can be extremely easily performed both in piping design and on-site construction. Especially for on-site construction, there is no need to perform cutting, thread cutting, welding, etc. on site, work is easy and cost can be reduced, and the butterfly valve, check valve and pipe part are functionally and aesthetically combined in advance. Because you can keep it
Easy handling and beautiful piping. Further, the heat insulating coating can be integrally applied to the entire piping unit, which also contributes to cost reduction due to labor saving in the field construction, and can provide a unified appearance. Further, since the butterfly valve and the check valve are configured so that they can be taken out from the piping unit individually, they can be removed individually for inspection, maintenance, etc. without removing the entire piping unit. Furthermore, if the inside of the butterfly valve and the check valve is rubber or resin coated or has a corrosion resistant structure using a corrosion resistant material, and the inside of the pipe part is resin coated,
The entire piping unit has an anticorrosion structure and does not become a source of red water problems. Further, the present piping unit can be used not only in the discharge pipe of the pump but also in the suction pipe, the air conditioner, and the refrigerator.

【Example】

An embodiment of the piping unit of the present invention will be described based on the drawings. FIG. 1 is a half-part cross-sectional external view showing one embodiment of a piping unit of the present invention. In FIG. 1, 1 is a unit body, 2 is a butterfly valve, 3 is a check valve, 4 and 5 are pipe parts, and 6 and 7 are flexible joints and reducers included in the pipe part. , Check valve 3,
The pipe parts 4 and 5, the flexible joint 6, and the reducer 7 are connected to the adjacent parts by flanges. However, the connection may be made by screws, except for the connecting portions of the butterfly valve 2 and the check valve 3. The upper flange 5a of the pipe part 5 and the lower flange 7a of the reducer 7 which are both ends of the unit body 1 are JIS, ANSI.
Etc. is a standard pipe flange. It should be noted that one or both of these ends may be pipe threads. The butterfly valve 2 can be opened / closed by operating the handle 8 or the flow rate can be adjusted appropriately at intermediate intervals. FIG. 1 shows a state in which the disc 2a is fully opened. The check valve 3 has a spring (not shown) attached to the disc 3a, and when the fluid does not flow, the disc 3a is closed by the spring so that a water hammer is not generated. Backflow can be prevented. The check valve 3 shown in FIG. 1 is a dual plate type check valve having two discs 3a, and the disc 3a is shown opened by the flow of fluid. Reference numeral 9 is a thermometer, 10 is a pressure gauge, and these gauges are attached to the pipe section 4. Further, a flow meter or the like can be attached if necessary. The butterfly valve 2 and the check valve 3 are both wafer type as shown in FIG. 1, and the butterfly valve 2 is
The butterfly valve 2 can be taken out from between the lower flange 5b of the pipe portion 5 and the upper flange 4a of the pipe portion 4 by loosening the mounting nut 2b and removing the mounting bolt 2c. In addition, the check valve 3 is loosened by removing the mounting nut 3b, the mounting bolt 3c is pulled out, and the check valve 3 alone is taken out from between the lower flange 4b of the pipe portion 4 and the upper flange 6a of the flexible joint 6. be able to. Although not shown in FIG. 1, resin coating is applied to the inner surfaces of the pipe portions 4 and 5, the flexible joint 6 and the deducer 7, and the butterfly valve 2 and the check valve 3 are provided with an anticorrosion structure. It should be noted that the butterfly valve 2 and the check valve 3 are preferably provided with a rubber or resin coating on the internal liquid contact portion or have an anticorrosion structure using a corrosion resistant material. The flanged pipe 11 shown by the two-dot chain line in FIG. 1 is the discharge port of the pump or the pipe connected to it, and the flange 11a is connected to the lower flange 7a of the reducer 7, and the flange shown by the two-dot chain line is the same. The attached pipe 12 is a water supply pipe for supplying water to a water tank or the like, and the flange 12a is connected to the upper flange 5a of the pipe portion 5. FIG. 2 is a partial cross-sectional partial external view showing another embodiment, in which a plate flange 13 is used in place of the pipe portion 5 in FIG. 1, and the butterfly valve 2 includes the plate flange 13 and the pipe portion 4. The bolt 2d and the nut 2e are assembled with the upper flange 4a, and the plate flange 13 has a bolt hole (not shown) for connecting to the flange 12a. 3 to 6 are semi-sectional views showing different embodiments, in which 14 is a butt step surface formed at the connecting position of one or both ends of a butterfly valve or a check valve, 15
Is a projection surface provided on the mating flange 16, 17 is a connecting flange provided on the butterfly valve, and 18 is a gasket spacer. Next, based on the embodiment shown in FIGS. 1 to 6,
The operation will be described. First, when the unit body 1 is connected to the flanged pipe 11 on the discharge side of the pump, and the flanged pipe 12 that is the water supply pipe to the water tank is connected to the unit body 1, the water discharged from the pump is reduced. 7, a flexible joint 6, a check valve 3, a pipe part 4 equipped with a thermometer 9, a pressure gauge 10 and other instruments, a butterfly valve 2 in an open state, and a water supply pipe. It is sent to the reservoir through the flanged pipe 12. In this case, instruments such as the thermometer 9 and the pressure gauge 10 indicate the state of water flowing in the piping unit. The reducer 7 is for correcting the difference in diameter between the flanged pipe 11 and the unit body 1, and the flexible joint 6 is a core between the flanged pipe 11, the unit body 1 and the flanged pipe 12. This is for absorbing deviations, dimensional changes due to temperature changes, or vibrations. Further, both ends of the unit body 1 can be connected to the pipe flanges 11a and 12a of JIS, ANSI or the like, so that the pipe unit can be easily connected. This unit body 1 has a butterfly valve 2 that can be opened and closed and a flow rate adjusted, and a check valve 3 that prevents a backflow without generating a water hammer, so that the fluid flow can be blocked. Also, the flow rate can be adjusted, and when a backflow is about to occur due to a pump stop, the backflow can be prevented without causing a water hammer. As such a check valve 3, in the embodiment, a dual plate type check valve having a spring is used. Since the unit main body 1 in this example is integrally configured to have such a function, it can be extremely easily performed both in piping design and on-site construction. Particularly in the field construction, there is no need to perform cutting, thread cutting, welding, etc. on the site, the work is easy and the cost can be reduced, and the butterfly valve 2, the check valve 3, the pipe parts 4 and 5, the flexible joint 6 and Reducer 7,
Since they can be preliminarily combined functionally and aesthetically, it is possible to make the piping easy to handle and beautiful. Further, the heat insulating coating can be integrally applied to the entire unit main body 1, which also contributes to cost reduction due to labor saving in the field construction, and can provide a unified appearance. Further, since the butterfly valve 2 and the check valve 3 are configured so that they can be taken out from the unit body 1 by themselves, they can be removed individually for inspection and maintenance without removing the entire unit body 1. You can Further, the inside of the butterfly valve 2 and the check valve 3 is coated with rubber or resin or has an anticorrosion structure using a corrosion resistant material, and the inner surfaces of the pipe portions 4 and 5, the flexible joint 6 and the reducer 7 are resin coated. As a result, the entire unit body 1 has an anticorrosion structure, and does not become a source of the red water problem. "Effects of the Invention" The piping unit of the present invention has the following excellent effects. It can be installed between standard piping connections, and piping design and on-site construction are easy. The piping is uniform, functional and aesthetic. There is no need to perform cutting, threading, welding, and the like on the site, so that site installation is easy and cost is reduced. It is possible to prevent the flow of the fluid in the pipe, cutoff, and backflow. Water hammer does not occur during backflow prevention. The butterfly valve and check valve can be taken out from the piping unit individually for inspection and maintenance. It has an anticorrosion structure and does not become a source of red water problems. The present invention can be used not only for a discharge pipe of a pump but also for a suction pipe, an air conditioner, a refrigerator and the like. There is no need to individually install butterfly valves and instruments in the piping, and the installation is completed by simply attaching the flanges provided at both ends of the unit body to the piping connection position on site.
Further, the centering work of the butterfly valve is not necessary, and even if the direction of the butterfly valve is changed, the centering work can be easily performed.

[Brief description of the drawings]

FIG. 1 is a half-section cross-sectional external view showing one embodiment of a piping unit of the present invention, and FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, and FIG. It is a half cross-sectional view showing an example. Further, FIG. 8 is an external view showing an example of a discharge pipe of a conventional pump. 1 ... Unit body, 2 ... Butterfly valve 3 ... Check valve 4,5 ... Pipe section 6 ... Flexible joint 7 ... Reducer, 8 ... Temperature meter 9 ... Pressure gauge, 14 ... Butting Step surface 15 ... Ridge surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography SHO 64-35294 (JP, U) ACT 61-23571 (JP, U)

Claims (3)

(57) [Claims] 1. A piping unit used for a pump discharge pipe or the like, wherein a butterfly valve is connected by flange joining between a short tubular pipe portion having flanges at both ends and a long tubular pipe portion having flange portions at both ends. A unit main body is configured to form a centering structure by forming a butt step surface at the connection position of one or both ends of the butterfly valve, and further, in the long tubular pipe part, a pressure gauge, a thermometer, A piping unit that is equipped with instruments such as a flow meter. 2. The butterfly valve alone can be detached from the unit body for maintenance or the like after the unit body is attached to the discharge pipe of the pump or the like.
The listed piping unit. 3. The piping unit according to claim 1 or 2, wherein a resin coating is applied to the inner surface of the pipe portion of the unit main body to form a corrosion-proof structure together with the butterfly valve.