JPH03220418A - Measuring apparatus of flow rate of steam trap - Google Patents

Abstract

PURPOSE:To enable accurate measurement of the leak circulation amount of steam and the circulation amount of drain without mutual hindrance between them by constructing an apparatus of a vibration sound detecting means, a plurality of filters and an arithmetic means. CONSTITUTION:An output of a vibration detector 2 having a probe 1 is amplified 3 and then supplied to filters 4A to 4C... These filters are so constructed as to pass outputs only for zones A to C,... respectively. An output of each filter is supplied to an electronic computer 7 via a change-over switch 5 and an A/D converter 6 and concurrently via a change-over switch 8 and an A/D converter 9. When a machine-type specification signal M is inputted, the electronic computer 7 controls the change-over switches 5 and 8 in accordance with the type of a machine, reads values of constants Ka to Kc,... corresponding to the type of the machine specified out of its own table and executes computation by using the read constants, and values of the circulation amount WS of steam and the circulation amount WD of drain thus obtained are displayed on a display unit 11.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is based on the level of vibration sound generated when steam or condensate flows through a steam trap. j:,
-Flow*: Applies to equipment that measures either or both of waste and drain flow rates.

[Conventional technology]

Steam traps constantly leak steam and condensate when the valve body or valve seat is damaged, thereby producing a characteristic vibration noise. Depending on the model, the vibration noise may be caused by this steam leakage, for example, as shown in Figure 2.
The odd frequency range A around z may be detected as being emphasized compared to the vibration sound caused by drain flow.

Utilizing this phenomenon, as shown in FIG. 4, the vibration sound of the steam trap is captured by a microphone 42 having a probe 41 in contact with it, amplified by an amplifier 43, and a second A device is known in which the signal is passed through a filter 44 that extracts only band A shown in the figure, converted by an AD converter 45, processed by a computer circuit 46, and displayed on a suitable display 47.

Here, when the microphone 42 has a characteristic of capturing only the band A shown in FIG. 2, the filter 44 can be omitted. Further, the computer circuit 46 is configured to calculate the leakage steam flow jJ by changing calculation constants according to the model of the steam trap.

[Invention or problem to be solved]

The conventional device shown in No. 41J, which is of the model type, is capable of measuring the flow t of leaked steam at a constant value.
Because it is strongly affected by the flow rate of drain, it has not been possible to measure the flow rate of drain with high precision. In addition, I was unable to use another model that did not emphasize the steam flow sound in the odd frequency range A.

This invention separates the vibrational noise of a wide range of steam trap models into components caused by leakage steam and components caused by drain flow, and achieves high accuracy in the flow of one or both of leaked steam and drain. - is intended to be measured.

(Means for Solving the Problems) The present invention includes a detection means, such as a microphone, for detecting the vibration sound of a steam trap, and a detection means, such as a microphone, for detecting the vibration sound of a steam trap, and a detection means that detects the vibration sound by detecting two components having different mixing ratios of steam flow sound and drain flow sound. First and second filters each extract vibration sounds in frequency bands, for example, bands A and B shown in FIG. Alternatively, it consists of an arithmetic means for calculating both.

Depending on the steam trap model, there may be a large difference in the mixing ratio of steam flow sound and drain flow sound not between the frequency bands AB shown in m2UA but between different frequency bands. It is desirable that the frequency bands of the first and second filters be switched in conjunction with the designation.

The ha calculation means has a constant determined for each steam trap model, selects a calculation constant from this by specifying the model, and calculates the vibration sound of each frequency band extracted above by using the selected calculation constant. By processing, one or both of the steam flow rate and the drain flow rate are calculated.

(Function) The apparatus described in I (here, by specifying the steam trap model, it is assumed that the frequency band interval ψ, hiB shown in Fig. 2 is used.The detection means is as shown in Fig. 2). The vibration sound that is a mixture of the steam flow component and the drain flow component shown in the figure is detected over almost the entire frequency range, and the first and second
The filters extract vibration sounds in frequency bands A and B, respectively.

r-Me, by flowing only steam through the steam trap and not changing the steam flow HW, the levels LSA and Lsa of the steam flow sound obtained in one frequency odd region A and B, respectively.
of? i! By determining 4, it is possible to know the relationship expressed by the linear equation.

LsA=f CWs) (1) Lsn=
f (ws) −−−−−−−−(2) Similarly, only drain is allowed to flow through the steam trap, and drain flow i
Wo, and the level L of the drain flow sound obtained in the odd frequency ranges A and B, respectively. A andri. It is possible to know the relationship as shown below.

LnA= f (W, ) −−−−−−・−(:l)
L nn = f (W n ) (4)
Next, if the levels of flow sound obtained in frequency bands A and B during actual measurement, which are a mixture of steam flow components and drain flow components, are respectively LA and 8th, then t, A = f (LSA, Ll)A ) --------
---(5) 8th = f (L5a, L, n)...
...(6) and LSA, LSII, L
The values of DA and LD8 are as shown in (1), (2), (3) above.
, (4) are known, so solve them in the form of a binary equation to obtain the steam flow rate Ws and the drain flow rate Bw. It is possible to calculate.

For simplicity, as shown in FIG. 3, the steam flow sound levels LSA and Lsa are linear functions of the steam flow rate W3, and the drain flow sound level L is a linear function of the steam flow rate W3. A andri. B or drain flow rate W. Assuming that it is a linear function of L SA= Ka
Ws 10K b ・””(I)′LsB=KcW, 10,・・・・・・・・・(2)′(, DA=KewD+,
−・・・・・・(3)′L OB=, WD+Kh・・
...(4)', and ~Kh is required for the eight constants.

Also, if equations (5) Ji' and (6) are two-dimensional equations as shown below, eight constants are still required.

Therefore, there are 16 constants and 1. Store the values of ~, and 1~Kt in the ', ti, f, i + calculator, and select the value of each constant by specifying the type of steam trap to be measured. It is convenient to keep it.

In addition, if the above formulas (1) to (6) or higher-order functions are used, the necessary constants will increase, or by using an electronic computer, these values will be selected and calculated in the cylinder. Something comes up.

C″XX In Example 1M, the output of the vibration detector 2 having the probe l is amplified by the amplification tube 3 and then passed through the filters 4A, 4B, 1
(:...) These filters are configured to pass only the bands A, B, C, etc. shown in No. 21N, respectively.The output of each filter is connected to the selector switch 5 and It is supplied to the electronic meter rX machine 7 via the AD converter 6, and is simultaneously connected to the changeover switch 8 and the AD converter 9.
It is supplied to the electronic computer 7 via. When the computer 7 receives the model designation signal M, it controls the changeover switches 5 and 8 according to the model, and selects a constant corresponding to the designated model from the table 1O stored in itself. 4,
The steam flow rate Ws and the drain flow rate W are obtained by reading out the values of Kc, . . . and performing calculations using the read constants. The value of is displayed on the display 11.

In the device described above, first, the steam trap model M,
If , the selector switches 5 and 8 select the filters 4A and 4B, respectively, so that the vibration sounds LA and L8 in bands A and B shown in FIG. 2 are introduced into the electronic meter 1[7. Also, from table IO, constants Ka to Kh and values of ~Kt corresponding to model M, a to h, and m to
t is read out. Therefore, the simultaneous equations are solved based on equations (5)' and (6)', and the obtained steam flow rate Ws and drain flow rate @WD are displayed on the display 11.

(Effect of the invention) Below 1. As is clear from Example '
- Being able to measure accurately without being interfered with by heat management greatly contributes to heat management.

[Brief explanation of drawings]

Fig. 1 is a flow rough diagram of an embodiment of the present invention, and Fig. 2 is a line L4 showing an example of the frequency distribution of vibration sound of a steam trap.
, Figure 3 is a diagram showing an example of the relationship between the distribution fee and the liver level of each component of the vibration sound of a steam trap, and Figure 4 [71
is a block diagram of a conventional steam leak μ measuring device. 2... Vibration sound detector, 4A... First filter 4... Second filter, 7... Electronic computer (
Calculation (1 stage), IO...Constant number for each model.Sugar 1st 21!1 Patent issued by Teilfi Co., Ltd.

Claims (1)

[Claims] (1) Means for detecting the vibration sound of the steam trap, and first and second filters for respectively extracting vibration sounds in two frequency bands with different mixing ratios of steam flow sound and drain flow sound from the vibration sound. and a calculation means for calculating the amount of steam and/or condensate flowing through the steam trap based on a constant determined for each steam trap model and the vibration sound level of each extracted frequency band. A steam trap flow rate measuring device characterized by: