JPS63246618A - Flow rate detector - Google Patents

Abstract

PURPOSE:To measure a flow rate with high accuracy by reducing a measuring error, by respectively providing chambers for averaging the total pressure or static pressure introduced from a plurality of total pressure or static pressure holes to both of a fluid total pressure route and a fluid static pressure route. CONSTITUTION:A flow rate detector 3 contains a ring body 6 and four ribs 9 are provided to the internal space having an inner diameter 6a of the ring body 6 so as to cross each other crosswise at the centers thereof. A fluid total pressure route 10 introducing the total pressure in fluid pipings 1, 2 into a flow rate indicator 5 and a fluid static pressure route 11 introducing the static pressure of a fluid into a flow rate indicator 5 are provided to the ribs 9. Further, chambers 15, 19 averaging the total pressure or static pressure introduced from a plurality of total pressure holes 12a, 12b or static pressure holes 16a, 16b are respectively provided to the fluid total pressure route 10 and the fluid static pressure route 11.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a flow rate detector for detecting the flow IH of fluid in fluid piping of cold/hot water pumps, refrigerators, air conditioning equipment, etc. .

[Conventional technology]

Conventionally, devices have been known that measure the flow rate in the fluid piping by attaching a flow rate detector equipped with a detection tube for introducing fluid to the fluid piping and connecting a flow rate indicator to the flow rate detector. As a technique, there is a measuring device as disclosed in, for example, Japanese Utility Model Application Publication No. 60-158118.

This device attaches a flow detector to a socket 1 protruding from the outer wall of the fluid piping, and detects the tip of the flow detector! is installed orthogonally in the fluid piping, and an lff1 indicator is screwed to the outer end of the detector, and multiple introduction holes are bored on the upstream side of the detection tube to introduce the total pressure of the fluid. There is.

The upper flow detector averages the total pressure of the fluid introduced from multiple total pressure holes within the detection tube, reducing errors in the total pressure and making it possible to accurately measure outflow. .

C Problems to be Solved by the Invention] However, the above method captures the total pressure in the fluid only on one line, so there is a limit to the improvement in accuracy of the flow rate.

The present invention was made against this background, and an object of the present invention is to provide a flow δ detector that further improves pumping measurement accuracy.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a plurality of ribs intersecting at the center in the internal space of a ring body interposed in a fluid piping, and a first total pressure passage is provided on the fluid upstream side of each rib. A first static pressure passage is formed on the downstream side of the fluid, and a total pressure hole is provided for introducing the total pressure of the fluid into each first total pressure passage.
A static pressure hole is provided for introducing static pressure of a fluid into the static pressure passage, and a second total pressure passage and a second static pressure passage that are open to the peripheral surface of the ring body are formed in one of the ribs, and a second total pressure passage and a second static pressure passage are formed in one of the ribs. 2 at the intersection of the ribs
chambers, the first and second total pressure passages are connected to one chamber to form a total fluid pressure path, and the first and second static pressure passages are connected to the other chamber to form a fluid static pressure path. Each is characterized by its formation.

(Function) According to the above configuration, the total pressure applied to each total pressure hole is averaged within the chamber via the first total pressure passage, and is further introduced into the flow rate indicator from the second total pressure passage. . In addition, the static pressure introduced from each static pressure hole is averaged within the chamber via the first static pressure passage, and is further introduced into the flow R indicator from the second static pressure passage, and the differential pressure within the outflow indicator is That is, it becomes a dynamic pressure, and the flow rate is displayed by this dynamic pressure.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Between the fluid piping 1.2 that circulates fluids such as cold and hot water,
A flow ω detector 3 for detecting the flow rate of fluid is interposed, and a flow rate indicator 15 is attached to the detector 3 via a device 4.

The flow rate detector 3 is installed by sandwiching the ring body 6 between the fluid piping 1.2 and screwing the 7 langes 1a and 2a of the piping 1.2 through a plurality of holes hB and nuts N. Something,
The inner diameter Ft 6 a of the ring body 6 is formed to have the same diameter as the inner diameters 1 b and 2 b of the fluid pipes 1 and 2, and the guide of the shaft portion of the through bolt B prevents the ring body 6 from moving in the lateral direction. has been done.

The ring body 6 has a socket 1-7 welded to its outer circumference, which becomes the outer cylinder of the device 4, and a socket 1-7, which serves as an outer cylinder of the device 4, is welded to the outer circumference, and a socket 1-7, which serves as the outer cylinder of the device 4, is welded to the outer periphery of the ring body 6.
Wooden ribs 9 are arranged criss-cross in the center.
The above rib 9 is arranged on an extension line of one rib 9.

The rib 9 has a total fluid pressure path 10 for introducing the total pressure of the fluid in the fluid pipes 1 and 2 to the flow rate indicator 5, and a passage for introducing the static pressure of the fluid.
A hydrostatic pressure path 11 leading to the indicator 5 is provided.

The fluid total pressure path 10 includes total pressure holes 12a and 12b on the inner and outer peripheries that open at the upstream end surface 9a of each rib 9, and the total pressure holes 12a.
, 12b within the rib 9, a second total pressure passage 14 that opens to the circumferential surface of the ring body 6 in the socket 7, and a chamber 15 that connects both tank pressure passages 13.14.
It is composed of.

Further, the fluid static pressure path 11 includes both sides 9b, gb of each rib 9.
static pressure holes 16a, 16b on the inner and outer peripheries that open downstream of the
A first static pressure passage 17 communicating the static pressure holes 16a and 16b within the rib 9, a second static pressure passage 18 opening to the outer peripheral surface of the ring body 6 in the socket 7, and each double-sided pressure passage 17.18. The static pressure hole 16a on the inner circumference side is provided at the corresponding position to the total pressure hole 12a, and the static pressure hole 16b on the outer circumference side is provided at the corresponding position to the total pressure hole 12b. .

-1- The chamber 15 of the fluid total pressure path 10 is provided at the intersection 9c of the rib 9 which is equidistant from the total pressure hole 12a on the inner peripheral side and the total pressure hole 12b on the outer peripheral side, and Hole 12a, 1
2b, and the chamber 19 of the hydrostatic pressure path 11 is similarly provided at the intersection 9C of the ribs 9 equidistant from each static pressure hole 16a, 16b.
16b is averaged.

In the above installation, there is a communication path 2 inside and outside the socket 7 of the device 4.
A sleeve 22 having a diameter of 0.21 mm is provided, and a small diameter opening 22a at the tip of the sleeve 22 is inserted into the second total pressure passage 14 through a seal ring 23 in a fluid-tight manner.

Next, the operation of this embodiment configured as described above will be explained.

The total pressure of the fluid is applied to each of the total pressure holes 12 a and 12 b of the total fluid pressure path 10 that opens toward the upstream side of the fluid, and these total pressures enter the chamber 15 from the first total pressure path 13 .

Here, if the main flow hanging detector 3 is installed, for example, directly under a bent pipe or a feed pump, the fluid will become quite turbulent.
Although the total pressure applied to each of the total pressure holes 12a and 12b is different, since the chamber 15 is provided at the same distance from the total pressure hole 12a on the inner peripheral side and the total pressure hole 12b on the outer peripheral side, these total pressures to obtain a total pressure close to the average of the fluid.

This total pressure is introduced into the flow rate indicator 5 from the chamber 15 through a second total pressure passage 14 and a communication passage 20 mounted inside the device 4 .

Further, the static pressure of the fluid is introduced from each static pressure hole 16a, 16b of the fluid static pressure path 11, and these static pressures are applied to the first static pressure path 1.
7 into the chamber 19 and averaged in the same way as the total pressure above, and further introduced into the flow rate indicator 5 from the second static pressure passage 18 and the communication passage 21 outside the device 4.

The total pressure and the static pressure measured by the flow rate indicator 5 become a differential pressure and a dynamic pressure, and the flow rate is displayed by this dynamic pressure.

As a result, the total pressure and static pressure of the fluid flowing through the fluid piping are detected from the plurality of total pressure holes or static pressure holes provided in the cross-shaped ribs. −
After being averaged in each chamber, the flow rate is measured by a flow indicator.

Therefore, since the fluid flowing through the fluid pipe 1.2 introduces the total pressure and static pressure from multiple locations on the same surface, measurement errors are reduced, compared to the conventional method where the pressure is measured only on one line. Therefore, the accuracy can be further improved, so that the flow rate can be measured with high accuracy even when the flow rate detector is installed at 27 locations such as in a bent pipe or in a turbulent flow directly under the feed pump.

In the above embodiment, the ribs inside the ring body are arranged in a cross shape, and two total pressure holes and two static pressure holes are provided on the inner and outer peripheries of each rib. The more static pressure holes are provided, the more the total pressure and static pressure of the fluid can be taken at more locations, and the flow rate can be measured with better viscosity.

〔Effect of the invention〕

As explained above, the flow rate detector of the present invention is provided with a plurality of ribs intersecting at the center in the internal space of a ring body interposed in a fluid piping, and a fluid total pressure path formed in the ribs and a fluid Since the static pressure path is provided with a chamber that averages the total pressure or static pressure introduced from a plurality of total pressure holes or static pressure holes, measurement errors are reduced compared to conventional ones.
: It is possible to measure a flow rate with a high degree of M, and it is suitable not only when the fluid is a laminar flow, but also for measuring turbulent flow directly under a feeding pump or a curved pipe of a fluid piping where the flow velocity distribution is unstable.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a half-sectional perspective view of a flow rate detector, and FIG. 2 is a sectional front view showing the installation state. 1.2...Fluid piping 1b, 2b...Fluid piping 1
Inner diameter of ゜2 3...Flow rate detector 4...Mounting device 5...Flowmeter indicator 6...Ring body 6a
... Inner diameter of ring body 6 7 ... Socket 8.
...Inner space 9...Rib 10...Fluid total pressure path 11...Fluid static pressure path 12a, 12b...
Total pressure hole 13...First total pressure passage 14...Second
Total pressure passage 15... Buyamba 16a, 16b.
...Static pressure hole 17...First static pressure passage 18...
1 second static pressure passage...chamber

Claims (1)

[Claims] 1. A plurality of ribs intersecting at the center are provided in the internal space of a ring body interposed in the fluid piping, and a first total pressure passage is provided on the fluid upstream side of each rib, and a first static pressure passage is provided on the fluid downstream side of each rib. a total pressure hole for introducing the total pressure of the fluid into each of the first total pressure passages, a static pressure hole for introducing the static pressure of the fluid into each of the first static pressure passages, and one of the ribs. A second total pressure passage and a second static pressure passage are formed in the circumferential surface of the ring body, and two chambers are provided at the intersection of the ribs.
Connect the total pressure passage to one chamber to create a total fluid pressure path.
A flow rate detector characterized in that the first and second static pressure passages are connected to the other chamber to form respective fluid static pressure paths.