JP6659911B2 - Impeller - Google Patents

Description

The present invention relates to an impeller used for a liquid pump.
This application claims priority based on Japanese Patent Application No. 2017-047545 for which it applied on March 13, 2017, and uses the content here.

  2. Description of the Related Art In general, a liquid pump is known in which a disk-shaped impeller is rotated by a motor to pump up liquid. As a conventional technique relating to an impeller used in such a liquid pump, there is a technique disclosed in Patent Document 1.

  As shown in Patent Document 1, an impeller has a plurality of blades provided along a circumferential direction, and blade grooves formed in a region sandwiched by these blades. The angle between the line segment connecting the center of any blade to the rotation center of the impeller and the line segment connecting the center of the blade adjacent to this arbitrary blade to the rotation center of the impeller is defined as the pitch angle of the blade. In this case, the blades are arranged so that the values of the pitch angles are different from each other. In addition, the blade grooves are arranged at different pitch angles.

  Since the blade grooves having different pitch angles are arranged irregularly over the entire circumference of the impeller, it is possible to reduce the peak of the sound pressure generated due to the rotation of the impeller. As a result, noise generated from the liquid pump can be suppressed.

JP-A-11-50990

  From Patent Literature 1, it can be seen that in order to reduce noise, all pitch angles of the blade grooves need to be different. On the other hand, it is also known that the pump efficiency of the liquid pump is maximized when the blade grooves are arranged at an equal pitch.

  An object of the present invention is to provide an impeller that can reduce noise while ensuring pump efficiency of a liquid pump.

According to an aspect of the present invention, in a substantially disk-shaped impeller used for a liquid pump and for pumping a liquid by being rotated by a driving source,
The impeller has i blades provided along a circumferential direction, and i blade grooves formed in a region sandwiched by these blades,
a line segment connecting the center of the n-th (n = 1 to i) blade to the rotation center of the impeller, and the center of the (n + 1) -th (where n = i, first) blade From the line segment connecting the rotation center of the impeller to the pitch angle θn of the nth blade groove,
The blade groove constitutes a blade groove group for every m blades satisfying m ≧ 5 continuously from the first blade groove (however, if i / m is not an integer, the i-th blade groove is The blade groove group includes a fraction of less than m),
The pitch angle θn is:
A value different from the pitch angle of the other blade grooves constituting one blade groove group,
When the minimum pitch angle is θmin and the maximum pitch angle is θmax in one blade groove group, θmax−θmin ≦ 5 °, and each is set to have an equal difference from θmin to θmax,
The integrated pitch angle tn is the sum of the pitch angles from the nth blade groove having a pitch angle θn to the position before the kth blade groove having the same pitch angle θk along the circumferential direction,
Among the first integrated pitch angle t ₁ to i-th integrated pitch angle t _i, with which takes a single value is 2 or less, a set number i × 0.18 of what it takes the same value An impeller is provided that is not exceeded.

In the above embodiment, when preferably, by arranging the when the number of sets of those taking the same value there are two or more, in order from the first small angle from the integrated pitch angle t ₁ to i-th integrated pitch angle t _i Is set so that at least one integrated pitch angle that does not take the same value is included between the sets of the same value.

  In the above aspect, preferably, when the number of pairs having the same value is two or more, the difference in angle between the pair having the same value is greater than 1 °.

  In the above aspect, preferably, the θmin is 9 ° or more, and the θmax is 13 ° or less.

In another aspect of the present invention, an impeller for a liquid pump includes a disk, i blades circumferentially arranged on the disk, and i grooves provided between the blades on the disk. And the following conditions are satisfied.
(I) The grooves are grouped into a plurality of groups, and each group is composed of m (m ≧ 5) grooves that are continuously arranged (provided that if i / m is not an integer, one group is the number of remaining (Consisting of 1, 2, 3, or 4) grooves),
(Ii) in each group, the values of the pitch angles are all different from each other;
(Iii) In each group, a row of pitch angle values arranged in ascending order has an equal difference relationship.
(Iv) In each group, θmax−θmin ≦ 5 °,
(V) the integrated pitch angle has a single value that is different from any of the other integrated pitch angles, or the common value of the two pairs of integrated pitch angles is different from any of the other integrated pitch angles;
(Vi) the number of unified pitch angle pairs having a common value does not exceed i × 0.18;
However,
a line segment extending between the center of the n-th (n = 1 to i) blade and the center of the disk; and the center of the (n + 1) -th blade (where n = i is the first) And the line segment extending between the center of the blade and the center of the disk is defined as an n-th pitch angle.
In each group, the minimum value of the pitch angle is defined as θmin, and the maximum value is defined as θmax.
Among pitch angles having the same value as the n-th pitch angle, a pitch angle next to the n-th pitch angle is set as a k-th pitch angle,
The integrated pitch angle from the nth to the (k-1) th continuous pitch angle is defined as an integrated pitch angle.

  In the above aspect, a single pair of integrated pitch angles having a common value and a second pair of integrated pitch angles having another common value are arranged in a single column in ascending order of all integrated pitch angles. At least one integrated pitch angle having a value may be provided.

  For example, the difference in value between a first pair of integrated pitch angles having a common value and a second pair of integrated pitch angles having another common value is greater than one.

  Further, for example, θmin is 9 ° or more, and θmax is 13 ° or less.

  In the aspect of the present invention, the pitch angle θn is a value different from the pitch angle of the other blade grooves constituting one blade groove group, θmax−θmin ≦ 5 °, and from θmin to θmax. Each of them is set to satisfy all of the following conditions. Since the pitch angle is different from the pitch angle of the other blade grooves forming the blade groove group, noise can be suppressed. On the other hand, since θmax−θmin ≦ 5 ° and θmin to θmax are equal, the magnitude of the pitch angle variation is kept within a certain range, and the pump efficiency is secured. The blade grooves are divided into a plurality of groups, and the pitch angle is set so that noise can be reduced while securing the pump efficiency of the liquid pump in each of these groups.

Furthermore, among the first integrated pitch angle t ₁ to i-th integrated pitch angle t _i, which takes a single value is 2 or less. The appearance of blade grooves having the same pitch angle at regular intervals can cause noise. Noise can be further reduced by reducing the number of parts that cause noise. In addition, the number of pairs having the same value from the _first integrated pitch angle t1 to the i-th integrated pitch angle t _i does not exceed i × 0.18. When it does not exceed i × 0.18, it was found that it was particularly excellent in noise reduction. Even if two or less take one value, it is difficult to reduce noise if there are a large number of sets having the same value. In this regard, noise can be further reduced by setting the number of pairs having the same value to i × 0.18 or less.

  According to the aspect of the present invention, by focusing on the integrated pitch angle, it is possible to prevent the blade grooves having the same pitch angle from appearing at regular intervals. For this reason, in each blade groove group and in the entire impeller, noise can be reduced while ensuring the pump efficiency of the liquid pump.

  As for the integrated pitch angle tn, at least one integrated pitch angle that does not take the same value is included between a pair having the same value. If pairs of values having the same value are close to each other, there will be many integrated pitch angles of the approximate values. When the integrated pitch angles that do not have the same value are interposed, the values of the sets having the same value are far from each other, and the noise can be further reduced.

  The angle difference between pairs that take the same value is greater than 1 °. If pairs of values having the same value are close to each other, there will be many integrated pitch angles of the approximate values. When the angle difference between the sets having the same value is greater than 1 °, the values of the sets having the same value are far from each other, and the noise can be further reduced.

  θmin is 9 ° or more, and θmax is 13 ° or less. By setting the pitch angle of the blade grooves so as to fall within this range, it has been found that the pump efficiency of the liquid pump can be particularly secured.

1 is a sectional view of a fuel pump equipped with an impeller according to an embodiment of the present invention. FIG. 2 is a plan view of the impeller shown in FIG. 1.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
<Example>

  Please refer to FIG. The impeller 20 according to the present invention is mounted on, for example, a fuel pump 10 provided in a motorcycle. The fuel pump 10 is used for pumping liquid fuel filled in a fuel tank and supplying it to an engine. The fuel pump 10 can also be called a liquid pump for pumping liquid.

  The fuel pump 10 mainly includes a motor 11 (drive source 11) driven by electric power from an external power supply, an impeller 20 fixed to a motor shaft 11 a of the motor 11, and a pump casing 30 surrounding the impeller 20. It is a component. The motor 11, the impeller 20, and the pump casing 30 are housed in the housing 15. The upper part of the housing 15 is covered by a lid member 16.

  The pump casing 30 includes a lower casing 31 disposed below the impeller 20, and an upper casing 32 that overlaps the lower casing 31 and covers the side and the upper side of the impeller 20.

  The lower casing 31 has a casing suction port 31a penetrated to suck liquid fuel from outside.

  The upper casing 32 has a casing outlet 32a that is penetrated to discharge the liquid fuel into the housing 15.

  The lid member 16 has a lid discharge port 16a penetrated to discharge the liquid fuel to the outside. The lid discharge port 16a is provided with a check valve 17 that can open and close the lid discharge port 16a.

  When the motor 11 operates, the impeller 20 rotates together with the motor shaft 11a. Thereby, the liquid fuel is sucked up. The sucked liquid fuel is guided into the pump casing 30 from the casing inlet 31a, and is discharged from the casing outlet 32a into the housing 15. The liquid fuel that has passed through the pump casing 30 opens the lid discharge port 16 a against the urging force of the check valve 17. The liquid fuel discharged from the lid discharge port 16a to the outside of the housing 15 is sent to the engine. In the next figure, the impeller 20 will be described in detail.

Please refer to FIG. In one example, the impeller 20 has a substantially disk shape. The impeller 20 includes a disk (base, main body) 21, 33 blades P ₁ to ₃₃ provided in the circumferential direction, and 33 blades formed in a region sandwiched by the blades P ₁ to ₃₃ . And the blade grooves Q _{1 to} Q ₃₃ .

  It can be said that the impeller 20 has i blades P provided in the circumferential direction and i blade grooves Q formed in a region sandwiched by the blades P. Alternatively, the impeller 20 includes a disk 21, i blades P circumferentially arranged in an annular region on the disk 21, and i grooves provided between the blades P in the annular region on the disk 21. Q.

The blade P ₁ arbitrarily selected as the first blade P _1, the second blade P _2, 3-th blade P ₃ from now counted clockwise. The impeller 20 has a from the first blade _{P 1} until 33 th blade _{P 33.}

The first vane P ₁ and blade grooves Q ₁ formed in the region sandwiched by the second blade P ₂ (intermediate region), the first of vane grooves Q _1. Similarly, the second vane groove Q ₂ to which is formed in a region sandwiched by the blade P ₂ and the third blade P _3, the second of the vane groove Q _2. 33 th blade _{P 33} and the first blade _{P 1} and blade grooves _{Q 33} which is formed in a region sandwiched between is a 33-th blade grooves _{Q 33.} The impeller 20 has a from the first vane groove _{Q 1} to 33 th blade grooves _{Q 33.}

  The number of blades P and blade grooves Q is not limited to 33. In another example, the impeller 20 can have a different number of blades and blade grooves than 33 each.

Rotation center CL line connecting to the L1 of the first impeller 20 from the center of the blade P _1, and the line segment L2, forms the connecting from the second center of blade P ₂ to the rotational center CL of the impeller 20 The angle is referred to as a pitch angle θ1 of the _first blade groove. Similarly, the second line segment connecting from the center of the blade P ₂ to the rotational center CL of the impeller 20 L2, and a line segment L3 connecting the from the third center of the blade P ₃ to the rotational center CL of the impeller 20 Is referred to as a pitch angle θ2 of the _second blade groove. A line segment L33 connecting the center of the _33rd blade P33 to the rotation center CL of the impeller 20 and a line segment L1 connecting the center of the _first blade P1 to the rotation center CL of the impeller 20 are formed. The angle is referred to as a pitch angle θ33 of the _33rd blade groove.

  That is, line segments L1 to L33 connecting the center of the n-th (n = 1 to i) blade P to the rotation center CL of the impeller 20 and the (n + 1) th (where n = i is the first) ), The angle formed by the line segments L2 to L33 to L1 connecting the center of the blade P to the rotation center CL of the impeller 20 can be referred to as the pitch angle θn of the nth blade groove. Alternatively, the line segments L1 to L33 extending between the center of the nth (n = 1 to i) blade P and the center of the disk 21 and the center of the (n + 1) th blade (where n = i The angle formed by the line segments L2 to L33 to L1 extending between the center of the first blade P and the center of the disk 21 is defined as an n-th pitch angle.

The blade grooves Q _{1 to} Q ₃₀ form a blade groove group R _{1 to} R ₆ every five blades continuously from the _first blade groove Q ₁ . Vane grooves _Q 31 _{to Q 33} constitute a blade groove groups _{R 7} in three.

The first blade groove group R ₁ is constituted by a blade grooves Q ₅ of the first blade grooves Q _{1 ~} 5. Similarly, the second blade groove group _{R 2} is constituted by a blade grooves _{Q 6} ~ 10 blade groove _{Q 10} of the sixth.

The blade groove Q constitutes a group of blade grooves R _{1 to} R ₇ every m pieces that satisfy m ≧ 5, continuing from the _first blade groove Q ₁ . However, if i / m is not an integer, the blade groove group R ₇ comprising i th blade grooves Q ₃₃ is constituted by a fraction less than the m. Alternatively, the grooves Q are grouped into a plurality of groups _R 1 to R _7. Each of the groups R _{1 to} R ₇ is composed of m (m ≧ 5) grooves that are continuously arranged. However, if i / m is not an integer, one group consists of the remaining number (1, 2, 3, or 4) of grooves.

  Refer also to Table 1. First, reference will be made to the pitch angles θ1 to θ5 according to Example 1.

  The first pitch angle θ1 is 9 °, the second pitch angle θ2 is 10 °, the third pitch angle θ3 is 11 °, the fourth pitch angle θ1 is 12 °, and the fifth pitch angle θ5 is 13 °. is there.

The first pitch angle θ1 is 9 °, which is different from the pitch angles θ2 to θ5 of the other blade grooves constituting the _first blade groove group R1. Similarly, the second pitch angle θ2 to the fifth pitch angle θ5 have different values from the pitch angles of the other blade grooves.

In addition, among the pitch angle θ1~θ5 blade grooves _Q 1 to Q ₅ constituting the first blade groove group _{R 1,} the minimum pitch angle θmin is located 9 ° at a first pitch angle .theta.1. The maximum pitch angle θmax is the fifth pitch angle θ5, which is 13 °. θmax−θmin = θ5−θ1 = 4 °.

Furthermore, the pitch angle θ1~θ5 blade grooves _Q 1 to Q ₅ constituting the first blade groove group _{R 1,} when arranged in ascending from θmin to θmax, 9 °, 10 °, 11 °, 12 °, 13 °. These are arranged at equal intervals of 1 °.

  These can be summarized as follows. The pitch angle θn (for example, θ1) has a value different from the pitch angle (for example, θ2 to θ5) of the other blade grooves constituting one blade groove group R. When the minimum pitch angle is θmin and the maximum pitch angle is θmax in one blade groove group R, the value of the pitch angle θn satisfies θmax−θmin ≦ 5 °. The value of the pitch angle θn is set such that, when the pitch angles of the blade grooves Q constituting one blade groove group R are arranged in ascending order, each of the values becomes equal from θmin to θmax.

θ6 to θ33 are similarly set. In other words, in the groups R _{1 to} R ₇ of the groove Q, the values of the corresponding pitch angles are all different from each other. In each of the groups R _{1 to} R ₇ , the columns of pitch angle values arranged in ascending order have an equal difference relationship. In each group, when the minimum value of the pitch angle is θmin and the maximum value is θmax, θmax−θmin ≦ 5 °.

From the first vane groove Q ₁ pitch angle is 9 °, and become the pitch angle of the next same value along the circumferential direction (9 °), a seventh blade grooves Q ₇ is .theta.7. Here, the sum of the pitch angles from the _first blade groove Q1 to the position before the _seventh blade groove Q7 is referred to as an integrated pitch angle (integrated angle, large pitch angle) tn. Integrated pitch angle _{t 1} is 9 ° + 10 ° + 11 ° + 12 ° + 13 ° + 12 ° = 67 °.

The integrated pitch angle tn is the k-th blade having the same pitch angle θk along the circumferential direction from the n-th blade groove Q (for example, the first blade groove Q ₁ ) whose pitch angle is θn. It can be defined as the sum of the pitch angles up to just before the groove Q (for example, the seventh blade groove Q ₇ ).

  In other words, among the pitch angles having the same value as the n-th pitch angle, when the next pitch angle after the n-th pitch angle is set to the k-th pitch angle, the n-th to (k-1) -th consecutive pitch angles The integrated pitch angle is referred to as an integrated pitch angle.

Note that the integrated pitch angle _{t 28,} the pitch angle _{θ 28, θ 29 ... θ 33} , θ 1, as the θ ₂ ... θ _5, returns to the theta ₁ across the pitch angle theta _33, are the following same value is the sum of the pitch angle of up to front of the pitch angle θ _5. In other words, integrated pitch angle _{t 28} is 13 ° + 10 ° + 12 ° + 9 ° + 11 ° + 10 ° + 9 ° + 10 ° + 11 ° + 12 ° = 107 °. Integrated pitch angle _{t 30} is the sum of theta ₃₀ through? _4, the 72 °. Similarly, for the integrated pitch angles t ₃₁ , t ₃₂ , and t ₃₃ , the sum is obtained across θ ₃₃ .

The integrated pitch angles tn thus obtained are arranged in ascending order. Then, at 23 °, the ninth integrated pitch angle t ₉ and the fifteenth integrated pitch angle t ₁₅ have the same value. Similarly, 22-th integrated pitch angle _{t 22} at 42 ° and 29 th integrated pitch angle _t 29, 44 ° in the eighth integration pitch angle _{t 8} and 27 th integrated pitch angle _t 27, 7 th at 64 ° integrated pitch angle _{t 7} and the 26-th integrated pitch angle _t 26, 68 ° on the 16th integrated pitch angle _{t 16} and 17 th integrating the pitch angle _{t 17} have the same value.

Here, the pitch angle θn of the blade groove Q is set so that three or more integrated pitch angles do not have the same value. That is, among the first integrated pitch angle t ₁ to the 33rd integrated pitch angle t _33, integrated pitch angle tn take one value can be said to be two or less. This is called a first requirement. In other words, in the first requirement, the integrated pitch angle has a single value that is different from any of the other integrated pitch angles, or a common value in two pairs of integrated pitch angles is different from any of the other integrated pitch angles .

  The set of integrated pitch angles tn having the same value was 23 sets of 42 °, 44 °, 64 °, and 68 °. This is about 15.2% (= (5/33) × 100) for 33 blades P.

Among the first integrated pitch angle t ₁ to i-th integrated pitch angle t _i, with which takes a single value is 2 or less, a set number i × 0.18 of what it takes the same value Can not be exceeded. This is called a second requirement. In other words, in the second requirement, the number of integrated pitch angle pairs having a common value does not exceed i × 0.18.

When arranged from small angle integrated pitch angle tn, 9 th integrated pitch angle _{t 9} and 15 th integrated pitch angle _{t 15} a is 23 ° set, and, 29 th and 22 th integrating the pitch angle _{t 22} Between the set of 42 ° which is the integrated pitch angle t ₂₉ of the fourth integrated pitch angle t ₄ which is 25 °, the 31st integrated pitch angle t ₃₁ which is 30 ° and the 18th integrated pitch angle t which is 32 ° integrated pitch angle _t 18, is 40 ° 32 th integrating the pitch angle _{t 32} is present.

It is to take 25 °, only the fourth integrated pitch angle t _4. The same applies to 30 °, 32 °, and 40 °.

The pitch angle θn is an integrated pitch angle that does not take the same value (for example, t ₄ , t ₃₁ ) between a set (for example, a set of 23 °) and a set (for example, a set of 42 °) having the same value. , T ₁₈ , t ₃₂ ) are set to be included. This is called a third requirement. In other words, in the third requirement, in all the ascending columns of the integrated pitch angles, a first pair of integrated pitch angles having a common value and a second pair of integrated pitch angles having another common value are arranged. At least one integrated pitch angle having a single value.

  The following can also be said. The angle difference between a set (for example, a set of 23 °) and a set (for example, a set of 42 °) having the same value is larger than 1 °. This is called a fourth requirement. In other words, in the fourth requirement, the value difference between the first pair of integrated pitch angles having a common value and the second pair of integrated pitch angles having another common value is greater than one.

  Example 1 satisfies all of the first to fourth requirements and is most preferable.

  Example 2 satisfies the first requirement and the second requirement. On the other hand, an integrated pitch angle that does not take the same value is not included between the set of 44 ° and the set of 45 ° that take the same value. For this reason, the third requirement is not satisfied. Furthermore, the angle difference between the set of 44 ° and the set of 45 ° taking the same value is 1 °, which does not satisfy the fourth requirement.

Refer to Table 2. The impeller in Example 3 is constituted by 30 blades. Therefore, the number of blade grooves is 30, and the pitch angle θn of the blade grooves is θ _{1 to} θ ₃₀ . Integrated pitch angle tn _is t 1 _{~t 30.}

  One blade groove group Rn is composed of six blade grooves. The pitch angles constituting one blade groove group Rn are 9.5 °, 10.5 °, 11.5 °, 12.5 °, 13.5 °, 14.5 ° from small pitch angles θmin to θmax. It has been.

  Example 3 satisfies the first requirement, the second requirement, and the fourth requirement. On the other hand, an integrated pitch angle that does not have the same value is not included between the 20 ° pair and the 24 ° pair that have the same value. For this reason, the third requirement is not satisfied.

  In the aspect of the present invention, it is important that the first requirement and the second requirement are satisfied. Such an embodiment of the present invention has the following effects. Explanation will be made according to Example 1 in Table 1.

The pitch angle θn (for example, θ1 to θ5) is a value (9 °, 10 °, 11 °, 12 °, 13 °) different from the pitch angle of the other blade grooves forming _one blade groove group (R ₁ ). ), Θmax−θmin ≦ 5 ° (θ5−θ1 = 4 °), and from θmin to θmax with equal differences (9 °, 10 °, 11 °, 12 °, 13 °). It is set to satisfy all of the things. Since the pitch angle is different from the pitch angle of the other blade grooves constituting the blade groove group (R ₁ ), noise can be suppressed. On the other hand, since θmax−θmin ≦ 5 ° and each of θmin to θmax is an equal difference, the magnitude of the variation of the pitch angle is kept within a certain range, and the pump efficiency is also ensured. The blade groove Q is divided into a plurality of groups (R _{1 to} R ₇ ), and the pitch angle is set such that noise can be reduced while securing the pump efficiency of the liquid pump in each of these groups.

Further, no more than two of them take one value (for example, 23 °) from the _first integrated pitch angle t ₁ to the i-th integrated pitch angle t _i (the 33rd integrated pitch angle t ₃₃ ). (The ninth integrated pitch angle t ₉ and the fifteenth integrated pitch angle t ₁₅ ). The appearance of blade grooves having the same pitch angle at regular intervals can cause noise. Noise can be further reduced by reducing the number of parts that cause noise. In addition, among the first integrated pitch angle t ₁ to the i-th integrated pitch angle t _i (the 33rd integrated pitch angle t ₃₃ ), the number (5) of pairs having the same value is i × 0 .18 or less (33 × 0.18 = 5.94 or less). When it does not exceed i × 0.18, it was found that it was particularly excellent in noise reduction. Even if two or less take one value, it is difficult to reduce noise if there are a large number of sets having the same value. In this regard, noise can be further reduced by setting the number of pairs having the same value to i × 0.18 or less.

  According to the aspect of the present invention, by focusing on the integrated pitch angle tn, the appearance of the blade grooves Q having the same pitch angle at regular intervals is suppressed. For this reason, in each of the blade groove groups R and in the entire impeller 20, noise can be reduced while ensuring the pump efficiency of the liquid pump.

Furthermore, integrated pitch angle tn is between pairs of those have the same value _{(t 9} take 23 ° and _{t 15)} and a set _{(t 22} and _{t 29} to take 42 °), integrated pitch does not take the same value At least one corner (t ₄ taking 25 °, t ₃₁ taking 30 °, t ₁₈ taking 32 °, t ₃₂ taking 40 °) is included. When the value of the set of those that take the same value (23 ° take t ₉ and t ₁₅₎ and the set (t ₂₂ and t ₂₉ to take 42 _°) are close, integrated pitch angle of numbers approximating there are many It will be. A set of ones that take the same value by intervening integrated pitch angles (t ₄ taking 25 °, t ₃₁ taking 30 °, t ₁₈ taking 32 °, t ₃₂ taking 40 °) that do not take the same value. Numerical values are separated from each other, so that noise can be further reduced.

Moreover, the difference in angle between the set _{(t 9} and _{t 15} that takes 23 °) and the set _{(t 22} and _{t 29} to take 42 °) take the same value is greater than 1 °. If pairs of values having the same value are close to each other, there will be many integrated pitch angles of the approximate values. When the angle difference between the sets having the same value is greater than 1 °, the values of the sets having the same value are far from each other, and the noise can be further reduced.

  Further, θmin is 9 ° or more, and θmax is 13 ° or less. By setting the pitch angle of the blade grooves so as to fall within this range, it has been found that the pump efficiency of the liquid pump can be particularly secured.

  The liquid pump on which the impeller according to the embodiment of the present invention is mounted is not limited to a fuel pump. Impellers according to aspects of the invention may be mounted on other types of liquid pumps. Further, the liquid pump can be provided in vehicles and vehicles other than motorcycles.

  The present invention is not limited to the embodiments as long as the functions and effects of the embodiments of the present invention are exhibited.

  The impeller according to the embodiment of the present invention is suitable for mounting on a fuel pump.

10. Fuel pump (liquid pump)
11 Motor (drive source)
20 impeller 21 disk (base, body)
P: blade Q: blade groove R: blade groove group CL: rotation center L1, L2: line segment

Claims (8)

In a substantially disk-shaped impeller that is used for a liquid pump and pumps liquid by being rotated by a driving source,
The impeller has i blades provided along a circumferential direction, and i blade grooves formed in a region sandwiched by these blades,
a line segment connecting the center of the n-th (n = 1 to i) blade to the rotation center of the impeller, and the center of the (n + 1) -th (where n = i, first) blade From the line segment connecting the rotation center of the impeller to the pitch angle θn of the nth blade groove,
The blade groove constitutes a blade groove group for every m blades satisfying m ≧ 5 continuously from the first blade groove (however, if i / m is not an integer, the i-th blade groove is The blade groove group includes a fraction of less than m),
The pitch angle θn is:
A value different from the pitch angle of the other blade grooves constituting one blade groove group,
When the minimum pitch angle is θmin and the maximum pitch angle is θmax in one blade groove group, θmax−θmin ≦ 5 °, and each is set to have an equal difference from θmin to θmax,
The integrated pitch angle tn is the sum of the pitch angles from the nth blade groove having a pitch angle θn to the position before the kth blade groove having the same pitch angle θk along the circumferential direction,
Among the first integrated pitch angle t ₁ to i-th integrated pitch angle t _i, with which takes a single value is 2 or less, a set number i × 0.18 of what it takes the same value An impeller characterized by not exceeding. Wherein when the number of sets of those taking the same value is more than one, when the first from the integrated pitch angle t ₁ arranged from a small angle to the i-th integrated pitch angle t _i sequentially takes the same value 2. The impeller according to claim 1, wherein at least one integrated pitch angle that does not take the same value is set between sets of objects.   2. The impeller according to claim 1, wherein, when the number of pairs having the same value is two or more, a difference in angle between the pair having the same value is larger than 1 °. 3.   The impeller according to any one of claims 1 to 3, wherein the θmin is 9 ° or more and the θmax is 13 ° or less. An impeller for a liquid pump,
Disc and
I blades circumferentially arranged on the disk;
I grooves each provided between the blades in the disc;
And the following conditions are satisfied.
(I) The grooves are grouped into a plurality of groups, and each group is composed of m (m ≧ 5) grooves arranged in a row (where i / m is not an integer, one group is the number (Consisting of 1, 2, 3, or 4) grooves),
(Ii) In each group, the values of the pitch angles are all different from each other;
(Iii) In each group, a row of pitch angle values arranged in ascending order has an equal difference relationship.
(Iv) In each group, θmax−θmin ≦ 5 °,
(V) the integrated pitch angle has a single value that is different from any of the other integrated pitch angles, or the common value of the two pairs of integrated pitch angles is different from any of the other integrated pitch angles;
(Vi) the number of unified pitch angle pairs having a common value does not exceed i × 0.18;
However,
a line segment extending between the center of the nth (n = 1 to i) blade and the center of the disk; and the center of the (n + 1) th blade (where n = i is the first) And the line segment extending between the center of the blade and the center of the disk is defined as an n-th pitch angle.
In each group, the minimum value of the pitch angle is defined as θmin, and the maximum value is defined as θmax.
Among pitch angles having the same value as the n-th pitch angle, a pitch angle next to the n-th pitch angle is set as a k-th pitch angle,
The integrated pitch angles from the nth to the (k-1) th continuous pitch angle are defined as an integrated pitch angle.   At least a single value having a single value between a first pair of integrated pitch angles having a common value and a second pair of integrated pitch angles having another common value in an ascending column of all integrated pitch angles. 6. The impeller according to claim 5, wherein one integrated pitch angle is provided.   7. The impeller according to claim 5, wherein the value difference between a first pair of integrated pitch angles having a common value and a second pair of integrated pitch angles having another common value is greater than one. .   8. The impeller according to claim 5, wherein θmin is equal to or greater than 9 ° and θmax is equal to or less than 13 °.

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