CN1862523A - Method for measuring and calculating standard efficiency of centrifugal pump and apparatus thereof - Google Patents

Abstract

The present invention relates to a measurement and calculation method of centrifugal pump standard efficiency. Said method includes the following steps: (1), in data base, firstly making corresponding table of pump flow rate and calculation efficiency and corresponding table of specific rotating speed and efficiency correction value; (2), according to operating condition point of centrifugal pump to be measured obtaining flow rate, delivery head and rotating speed of centrifugal pump; (3), inputting the parameter values of flow rate, delivery head an rotating speed of centrifugal pump, calculation module can be used for calculating specific rotating speed, said invention provides its calculation formula; (4), according to flow rate and specific rotating speed automatically-looking said corresponding table to obtain, calculation efficiency; and (5), utilizing a formula to obtain its standard efficiency value.

Description

A kind of measuring method of standard efficiency of centrifugal pump and device thereof

(1) technical field

The present invention relates to a kind of measuring method and device thereof of standard efficiency of centrifugal pump.

(2) background technology

Carry out the design studies work of centrifugal pump product, at first want the size of analytical calculation standard efficiency of centrifugal pump performance index, common way is to carry out GB/T13007-1991 " centrifugal pump efficient " national standard.After flow Q, lift H, rotation speed n are determined, the specific speed n of first calculating pump _s, computing formula is: $n_s=\frac{3.65n\sqrt{Q}}{H^{\frac{3}{4}}},$ Look in chart according to the size of pump discharge Q and to get counting yield η ₁, again according to the specific speed n of pump _sSize in chart, look into and get counting yield modified value Δ η, the standard performance value equals η ₁-Δ η, detailed calculated process and method document [1] GB/T13007-1991 " centrifugal pump efficient " national standard that sees reference.

Because the design conditions point of pump is determined according to user demand, design conditions point is change often, therefore want frequent basis of calculation efficiency value, the pump product is a many product of small dimension in batches, centrifugal pump size will have up to ten thousand kinds, the workload of calculating is very big, and especially the amount of calculation of product quality detection department more wants big.Owing to be that manually-operated is looked into and got chart data, easily produce error, precision is low, and the time that takies is also many, and traditional standard performance computing method can not satisfy the demand of pump industry technology work.

(3) summary of the invention

The deficiency that amount of calculation is big, precision is low, holding time is many for the measuring method that overcomes existing standard efficiency of centrifugal pump, the invention provides a kind of computer technology of utilizing, can carry out the calculating of standard efficiency of centrifugal pump fast, the computational accuracy height, the measuring method of time saving and energy saving standard efficiency of centrifugal pump and device thereof.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of measuring method of standard efficiency of centrifugal pump, described measuring method may further comprise the steps:

(1), in database, sets up pump discharge Q and counting yield η in advance ₁Corresponding tables, specific speed n _sWith efficient modified value Δ η corresponding tables;

(2), according to the operating point of centrifugal pump to be measured, obtain flow Q, lift H, the rotation speed n of centrifugal pump;

(3), import flow Q, the lift H of centrifugal pump, the parameter value of rotation speed n, computing module calculating specific speed n _s, computing formula is (1):

$n_s=\frac{3.65n\sqrt{Q}}{H^{\frac{3}{4}}}---\left(1\right)$

(4), according to flow Q, specific speed n _sAutomatically obtain counting yield η after looking into described corresponding tables ₁, efficient modified value Δ η;

(5), obtain the standard performance value, computing formula is (2):

η＝η ₁-Δη (2)

Further, in described (1), set up pump discharge Q and counting yield η ₁The rule of corresponding tables is:

As flow Q=5m ³/ h～100m ³In the time of in/h the scope, flow is every 1m ³/ h is provided with an efficiency value;

As flow Q=100～1000m ³In the time of in/h the scope, flow is every 10m ³/ h is provided with an efficiency value;

As flow Q=1000m ³/ h～10000m ³In the time of in/h the scope, flow is every 100m ³An efficiency value is set during/h;

In described (3), according to the flow Q of centrifugal pump, query flows Q belongs to in-scope in the corresponding tables automatically, determines counting yield η ₁

Further again, in described (1), set up specific speed n _sWith the rule of efficient modified value Δ η corresponding tables be:

Specific speed n _sIn the time of in=20～120 scopes, one of the every increase of specific speed is provided with an efficient modified value;

Specific speed n _sIn the time of in=120～210 scopes, the unification of efficient modified value is set to zero, Δ η _120-210=0;

Specific speed n _sIn the time of in=210-300 the scope, one of the every increase of specific speed is provided with an efficient modified value;

In described (3), according to the specific speed n of centrifugal pump _s, inquire about specific speed n automatically _sBelong to in-scope in the corresponding tables, determine counting yield modified value Δ η.

A kind of measuring and calculating device of standard efficiency of centrifugal pump, described measuring and calculating device comprises: the corresponding tables database is used to set up pump discharge Q and counting yield η ₁Corresponding tables, specific speed n _sWith efficient modified value Δ η corresponding tables;

Parameter input module is used for the operating point according to centrifugal pump to be measured, obtains flow Q, lift H, the rotation speed n of centrifugal pump;

The specific speed computing module is used for flow Q, lift H, rotation speed n according to input, calculates specific speed n _s, computing formula is (1):

$n_s=\frac{3.65n\sqrt{Q}}{H^{\frac{3}{4}}}---\left(1\right)$

Enquiry module is used for according to flow Q, specific speed n _sAutomatically obtain counting yield η after looking into described corresponding tables ₁, efficient modified value Δ η;

The standard performance computing module is used for according to counting yield η ₁, efficient modified value Δ η basis of calculation efficiency value, computing formula is (2):

η＝η ₁-Δη (2)

Further, in the described corresponding tables database, set up pump discharge Q and counting yield η ₁The rule of corresponding tables is:

As flow Q=5m ³/ h～100m ³In the time of in/h the scope, flow is every 1m ³/ h is provided with an efficiency value;

As flow Q=100～1000m ³In the time of in/h the scope, flow is every 10m ³/ h is provided with an efficiency value;

As flow Q=1000m ³/ h～10000m ³In the time of in/h the scope, flow is every 100m ³An efficiency value is set during/h;

In described (3), according to the flow Q of centrifugal pump, query flows Q belongs to in-scope in the corresponding tables automatically, determines counting yield η ₁

In the described corresponding tables database, set up specific speed n _sWith the rule of efficient modified value Δ η corresponding tables be:

Specific speed n _sIn the time of in=20～120 scopes, one of the every increase of specific speed is provided with an efficient modified value;

Specific speed n _sIn the time of in=120～210 scopes, the unification of efficient modified value is set to zero, Δ η _120-210=0;

Specific speed n _sIn the time of in=210-300 the scope, one of the every increase of specific speed is provided with an efficient modified value;

In described (3), according to the specific speed n of centrifugal pump _s, inquire about specific speed n automatically _sBelong to in-scope in the corresponding tables, determine counting yield modified value Δ η.

Principle of work of the present invention is: by means of computer technology, at the computation process of existing standard efficiency of centrifugal pump, in computing machine, set up pump discharge Q and counting yield η ₁Corresponding tables, specific speed n _sWith efficient modified value Δ η corresponding tables, and calculate n automatically according to computing formula _s, obtain counting yield η behind the data lookup table ₁With efficient modified value Δ η, promptly obtain standard performance η after subtracting each other.

When input one group of flow Q, lift H, rotation speed n, can calculate automatically to look into and get n _s, η ₁, Δ η, η technical indicator numerical value, only import data with common operating personnel, just can finish a large amount of standard performance value amounts of calculation.Saving technique personnel's quantity is also saved a large amount of time, and corresponding precision has also improved, and the size of precision can be according to how much determining of data is set.

Beneficial effect of the present invention mainly shows: utilizes computer technology, can carry out the calculating of standard efficiency of centrifugal pump fast, the computational accuracy height is time saving and energy saving.

(4) description of drawings

Fig. 1 is the process flow diagram of the measuring method of standard efficiency of centrifugal pump.

Fig. 2 is the theory diagram of the measuring and calculating device of standard efficiency of centrifugal pump.

(5) embodiment

Below in conjunction with accompanying drawing the present invention is further described.

Embodiment 1

With reference to Fig. 1, a kind of measuring method of standard efficiency of centrifugal pump, described measuring method may further comprise the steps:

(1), in database, sets up pump discharge Q and counting yield η in advance ₁Corresponding tables, specific speed n _sWith efficient modified value Δ η corresponding tables;

(2), according to the operating point of centrifugal pump to be measured, obtain flow Q, lift H, the rotation speed n of centrifugal pump;

(3), import flow Q, the lift H of centrifugal pump, the parameter value of rotation speed n, computing module calculating specific speed n _s, computing formula is (1):

$n_s=\frac{3.65n\sqrt{Q}}{H^{\frac{3}{4}}}---\left(1\right)$

(4), according to flow Q, specific speed n _sAutomatically obtain counting yield η after looking into described corresponding tables ₁, efficient modified value Δ η;

(5), obtain the standard performance value, computing formula is (2):

η＝η ₁-Δη (2)

In described (1), set up pump discharge Q and counting yield η ₁The rule of corresponding tables is:

As flow Q=5m ³/ h～100m ³In the time of in/h the scope, flow is every 1m ³/ h is provided with an efficiency value;

As flow Q=100～1000m ³In the time of in/h the scope, flow is every 10m ³/ h is provided with an efficiency value;

As flow Q=1000m ³/ h～10000m ³In the time of in/h the scope, flow is every 100m ³An efficiency value is set during/h;

In described (3), according to the flow Q of centrifugal pump, query flows Q belongs to in-scope in the corresponding tables automatically, determines counting yield η ₁, concrete corresponding tables is referring to table 1:

Q(m 3/h)	5	6	7	8	9	10	…
								η 1(％)	58.0	59.2	60.4	61.6	62.8	64.0	…
Q(m 3/h)	100	100～ 110	110～ 120	120～130	130～ 140	140～ 150	…
								η 1(％)	78.0	78.36	78.72	79.08	79.44	79.8	…
Q(m 3/h)	1000	1000～ 1100	1100～ 1200	1200～ 1300	1300～ 1400	1400～ 1500	…
								η 1(％)	85.7	85.88	86.06	86.24	86.42	86.6	…

Table 1

In described (1), set up specific speed n _sWith the rule of efficient modified value Δ η corresponding tables be:

Specific speed n _sIn the time of in=20～120 scopes, the every increase of specific speed one (being numerical value 1) is provided with an efficient modified value;

Specific speed n _sIn the time of in=120～210 scopes, the unification of efficient modified value is set to zero, Δ η _120-210=0;

Specific speed n _sIn the time of in=210-300 the scope, the every increase of specific speed one (being numerical value 1) is provided with an efficient modified value;

In described (3), according to the specific speed n of centrifugal pump _s, inquire about specific speed n automatically _sBelong to in-scope in the corresponding tables, determine counting yield modified value Δ η, concrete corresponding tables is referring to table 2:

n s	20	21	22	23	24	25	…
								Δη(％)	32	30.7	29.4	28.1	26.8	25.5	…
n s	120～210
								Δη(％)	0
n s	210	211	212	213	214	215	…
								Δη(％)	0	0.03	0.06	0.09	0.12	0.15	…

Table 2

Embodiment 2

Referring to Fig. 2, a kind of measuring and calculating device of standard efficiency of centrifugal pump, described measuring and calculating device comprises: corresponding tables database 1 is used to set up pump discharge Q and counting yield η ₁Corresponding tables, specific speed n _sWith efficient modified value Δ η corresponding tables; Parameter input module 2 is used for the operating point according to centrifugal pump to be measured, obtains flow Q, lift H, the rotation speed n of centrifugal pump; Specific speed computing module 3 is used for flow Q, lift H, rotation speed n according to input, calculates specific speed n _s, computing formula is (1):

$n_s=\frac{3.65n\sqrt{Q}}{H^{\frac{3}{4}}}---\left(1\right);$

Enquiry module 4 is used for according to flow Q, specific speed n _sAutomatically obtain counting yield η after looking into described corresponding tables ₁, efficient modified value Δ η; Standard performance computing module 5 is used for according to counting yield η ₁, efficient modified value Δ η basis of calculation efficiency value, computing formula is (2):

η＝η ₁-Δη (2)

In the described corresponding tables database 1, set up pump discharge Q and counting yield η ₁The rule of corresponding tables is:

As flow Q=5m ³/ h～100m ³In the time of in/h the scope, flow is every 1m ³/ h is provided with an efficiency value;

As flow Q=100～1000m ³In the time of in/H the scope, flow is every 10m ³/ h is provided with an efficiency value;

As flow Q=1000m ³/ h～10000m ³In the time of in/h the scope, flow is every 100m ³An efficiency value is set during/h;

In described (3), according to the flow Q of centrifugal pump, query flows Q belongs to in-scope in the corresponding tables automatically, determines counting yield η ₁, corresponding tables is referring to table 1.

In the described corresponding tables database 1, set up specific speed n _sWith the rule of efficient modified value Δ η corresponding tables be:

Specific speed n _sIn the time of in=20～120 scopes, one of the every increase of specific speed is provided with an efficient modified value;

Specific speed n _sIn the time of in=120～210 scopes, the unification of efficient modified value is set to zero, Δ η _120-210=0;

Specific speed n _sIn the time of in=210-300 the scope, one of the every increase of specific speed is provided with an efficient modified value;

In described (3), according to the specific speed n of centrifugal pump _s, inquire about specific speed n automatically _sBelong to in-scope in the corresponding tables, determine counting yield modified value Δ η, corresponding tables is referring to table 2.

Secondary development on EXCEL software is used, and subordinate list 3 is the standard efficiency of centrifugal pump reckoner of present embodiment.

Sequence number	Flow Q (m 3/h)	Lift H (m)	Rotation speed n (r/min)	Specific speed n s	Efficiency eta 1	Efficient modified value Δ η	Standard performance η	Remarks
									1
2
									

Table 3

When input one group of flow Q, lift H, rotation speed n, can calculate automatically to look into and get n _s, η ₁, Δ η, η technical indicator numerical value, only import data with common operating personnel, just can finish a large amount of standard performance value amounts of calculation.

Claims (6)

1, a kind of measuring method of standard efficiency of centrifugal pump, described measuring method may further comprise the steps:

(1), in database, sets up pump discharge Q and counting yield η in advance ₁Corresponding tables, specific speed n _sWith efficient modified value Δ η corresponding tables;

(2), according to the operating point of centrifugal pump to be measured, obtain flow Q, lift H, the rotation speed n of centrifugal pump;

(3), import flow Q, the lift H of centrifugal pump, the parameter value of rotation speed n, computing module calculating specific speed n _s, computing formula is (1):

$n_s=\frac{3.65n\sqrt{Q}}{H^{3/4}}---\left(1\right)$

(4), according to flow Q, specific speed n _sAutomatically obtain counting yield η after looking into described corresponding tables ₁, efficient modified value Δ η;

(5), obtain the standard performance value, computing formula is (2):

η＝η ₁-Δη (2)

2, the measuring method of a kind of standard efficiency of centrifugal pump as claimed in claim 1 is characterized in that: in described (1), set up pump discharge Q and counting yield η ₁The rule of corresponding tables is:

As flow Q=5m ³/ h～100m ³In the time of in/h the scope, flow is every 1m ³/ h is provided with an efficiency value;

As flow Q=100～1000m ³In the time of in/h the scope, flow is every 10m ³/ h is provided with an efficiency value;

As flow Q=1000m ³/ h～10000m ³In the time of in/h the scope, flow is every 100m ³An efficiency value is set during/h;

In described (3), according to the flow Q of centrifugal pump, query flows Q belongs to in-scope in the corresponding tables automatically, determines counting yield η ₁

3, the measuring method of a kind of standard efficiency of centrifugal pump as claimed in claim 1 or 2 is characterized in that: in described (1), set up specific speed n _sWith the rule of efficient modified value Δ η corresponding tables be:

Specific speed n _sIn the time of in=20～120 scopes, one of the every increase of specific speed is provided with an efficient modified value;

Specific speed n _sIn the time of in=120～210 scopes, the unification of efficient modified value is set to zero, Δ η _120-210=0;

Specific speed n _sIn the time of in=210-300 the scope, one of the every increase of specific speed is provided with an efficient modified value;

In described (3), according to the specific speed n of centrifugal pump _s, inquire about specific speed n automatically _sBelong to in-scope in the corresponding tables, determine counting yield modified value Δ η.

4, a kind of device of realizing the measuring method of standard efficiency of centrifugal pump as claimed in claim 1, it is characterized in that: described measurement mechanism comprises:

The corresponding tables database is used to set up pump discharge Q and counting yield η ₁Corresponding tables, specific speed n _sWith efficient modified value Δ η corresponding tables;

Parameter input module is used for the operating point according to centrifugal pump to be measured, obtains flow Q, lift H, the rotation speed n of centrifugal pump;

The specific speed computing module is used for flow Q, lift H, rotation speed n according to input, calculates specific speed n _s, computing formula is (1):

$n_s=\frac{3.65n\sqrt{Q}}{H^{3/4}}---\left(1\right)$

Enquiry module is used for according to flow Q, specific speed n _sAutomatically obtain counting yield η after looking into described corresponding tables ₁, efficient modified value Δ η;

The standard performance computing module is used for according to counting yield η ₁, efficient modified value Δ η basis of calculation efficiency value, computing formula is (2):

η＝η ₁-Δη (2)

5, standard efficiency of centrifugal pump measuring and calculating device as claimed in claim 4 is characterized in that: in the described corresponding tables database, set up pump discharge Q and counting yield η ₁The rule of corresponding tables is:

As flow Q=5m ³/ h～100m ³In the time of in/h the scope, flow is every 1m ³/ h is provided with an efficiency value;

As flow Q=100～1000m ³In the time of in/h the scope, flow is every 10m ³/ h is provided with an efficiency value;

As flow Q=1000m ³/ h～10000m ³In the time of in/h the scope, flow is every 100m ³An efficiency value is set during/h;

In described (3), according to the flow Q of centrifugal pump, query flows Q belongs to in-scope in the corresponding tables automatically, determines counting yield η ₁

6, as the measuring and calculating device of claim 4 or 5 described a kind of standard efficiency of centrifugal pump, it is characterized in that: in the described corresponding tables database, set up specific speed n _sWith the rule of efficient modified value Δ η corresponding tables be:

Specific speed n _sIn the time of in=20～120 scopes, one of the every increase of specific speed is provided with an efficient modified value;

Specific speed n _sIn the time of in=120～210 scopes, the unification of efficient modified value is set to zero, Δ η _120-210=0;

Specific speed n _sIn the time of in=210-300 the scope, one of the every increase of specific speed is provided with an efficient modified value;

In described (3), according to the specific speed n of centrifugal pump _s, inquire about specific speed n automatically _sBelong to in-scope in the corresponding tables, determine counting yield modified value Δ η.

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