CN101749153A - Fuel pump - Google Patents
Fuel pump Download PDFInfo
- Publication number
- CN101749153A CN101749153A CN200910161951A CN200910161951A CN101749153A CN 101749153 A CN101749153 A CN 101749153A CN 200910161951 A CN200910161951 A CN 200910161951A CN 200910161951 A CN200910161951 A CN 200910161951A CN 101749153 A CN101749153 A CN 101749153A
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- Prior art keywords
- impeller
- pump
- housing
- foreign matter
- fuel
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Abstract
The present invention provides a fuel pump, capable of preventing foreign matters stacked on the outer circumference of an impeller from contacting the impeller and preventing the efficiency of the pump from being reduced. The fuel pump is provided with a roughly circular disk shaped impeller (20) rotating through a motor part (70); and a housing (18) for accepting the impeller rotatablely and provided with foreign matter discharge passageways (100, 101) on the inner surface of the housing, wherein the discharge passageways are arranged on a position facing to a region between the outer circumference of the impeller and a first blade groove group (20b) as well as a second blade groove group (20c), and arranged on the circumference apart from the part from a fuel outlet (41) to a fuel inlet (40) when the fuel pump is viewed along the rotary direction of the impeller, and the foreign matter discharge passageways are used for discharging the foreign matters intaked from the fuel inlet into the housing to the fuel outlet.
Description
Technical field
The present invention relates to a kind of petrolift, the housing that it has impeller and rotatably accommodates this impeller.
Background technique
As the device that the fuel in the fuel tank is supplied with to internal-combustion engine (for example, the motor of vehicle etc.), known fuel pump.In this petrolift, pump portion has: housing; And roughly discoid impeller, it rotatably is housed in the housing.On the suction side of impeller, be formed with the blade slot part with ring-type along the peripheral part of impeller.On the discharge side of impeller, the position corresponding with the blade slot part that is formed at the suction side forms the blade slot part.Be formed at the suction side of impeller and the blade slot part on the discharge side, be communicated with by the bottom.
With the suction side of impeller with discharge on the relative shell inner surface in side, each comfortable be formed at impeller on the relative zone of blade slot part on, extend to the pump path of downstream from upstream extremity along the sense of rotation formation of impeller.The upstream extremity of the pump path of suction side is communicated with outward with housing by fuel suction port, discharges the downstream of the pump path of side, is communicated with outward with housing by fuel discharge outlet.
In this petrolift, if make the impeller rotation, then in housing, suck fuel from suction port, the fuel of suction is fed in the blade slot part and pump path of impeller.Fuel in being sucked into housing, the centrifugal force that effect is caused by the rotation of impeller.Be sucked into the fuel in the housing, on one side owing to the centrifugal force of impeller boosts, an edge pump path is side flow downstream, discharges outside housing from exhaust port.
In the fuel that petrolift sucked, majority has been sneaked into foreign matter (solid).If the rotation of fuel by impeller that is sucked in the housing is stirred, then, separate with fuel by the centrifugal force of impeller with the fuel bigger foreign matter of specific mass mutually, be deposited near the shell inner surface the peripheral part of impeller.Usually, consider the efficient of pump, with the degree of several μ m that be set between impeller and the shell inner surface to tens of μ m.Therefore, if pile up foreign matter on shell inner surface, then foreign matter and the impeller of piling up sometimes comes in contact.If impeller contacts with the foreign matter of accumulation, then make the wearing and tearing of impeller and/or shell inner surface and the fuel leak that produces the self-pumping path, thereby the efficient of pump is reduced.
Therefore, on the position in the more close outside of periphery of the ratio impeller of the shell inner surface relative, form groove with impeller surface.In this petrolift, will by impeller stir and from fuel isolated foreign matter be deposited in the groove that is formed on the shell inner surface.Therefore, can suppress contacting of impeller and foreign matter, thereby suppress the wearing and tearing of impeller.Thus, can keep higher pump efficiency.As the example of the prior art of this petrolift, can enumerate for example patent documentation 1.
Patent documentation 1: TOHKEMY 2008-51020 communique
Summary of the invention
In the petrolift shown in the patent documentation 1, a large amount of foreign matters are sucked under the situation in the pump, and foreign matter surpasses the allowing accumulating amount of groove and overflows from the groove inlet, and beginning is piled up near the shell inner surface the peripheral part of impeller.Like this, foreign matter begins to contact with impeller, makes impeller produce wearing and tearing, and the efficient of pump begins to descend.Under the situation of a spot of foreign matter of long-term suction, also produce identical phenomenon.
The present invention proposes in order to address the above problem, and its purpose is, a kind of petrolift is provided, and it can prevent to be deposited in contacting between near the periphery of impeller foreign matter and the impeller, thereby the efficient that prevents pump reduces.
Petrolift of the present invention has: roughly discoid impeller, and it is rotated by motor part; And housing, it rotatably accommodates described impeller, on the positive and negative of described impeller, with periphery on the zone that the distance of regulation is extended along Zhou Fangxiang in the inboard, form respectively by Zhou Fangxiang and go up the 1st blade groove group and the 2nd blade groove group that continuous recess group constitutes, on the internal surface of the described housing relative with described impeller front, with the right zone of described the 1st blade groove faciation on form the 1st pump path that extends to downstream from upstream extremity, on the internal surface of the described housing relative with described impeller reverse side, with the right zone of described the 2nd blade groove faciation on form the 2nd pump path that extends to downstream from upstream extremity, on described housing, be formed with: fuel suction port, it is with near upstream extremity of described the 1st pump path and the external communications of described housing; And fuel discharge outlet, it is with near downstream of described the 2nd pump path and the external communications of described housing, in this petrolift, on the described shell inner surface relative, form the foreign matter drain passageway with described impeller, it is positioned at and the periphery and the 1st blade groove group that are clipped in described impeller, on the regional relative position between the 2nd blade groove group, and the sense of rotation along described impeller is observed, be positioned at and remove from described fuel discharge outlet on the circumference beyond the part till the described fuel suction port, this foreign matter drain passageway is used for the foreign matter of will sneak in the fuel that sucks from described fuel suction port in described housing, discharge to described fuel discharge outlet.
The effect of invention
According to petrolift of the present invention, since make by impeller stir and from fuel isolated foreign matter, discharge to the outside of pump from the foreign matter drain passageway that is formed on the shell inner surface, so foreign matter can not be deposited in the inside of pump, can suppress contacting between impeller and the foreign matter, thereby suppress the wearing and tearing of impeller, thus, can keep higher pump efficiency.
Description of drawings
Fig. 1 is the sectional arrangement drawing of the related petrolift of expression embodiments of the present invention 1.
Fig. 2 be the pump portion in the presentation graphs 1 of amplifying want portion's sectional arrangement drawing.
Fig. 3 is the plan view of the impeller in the presentation graphs 1.
Fig. 4 is a plan view of observing the pump housing in Fig. 1 from impeller side.
Fig. 5 is a plan view of observing the pump cover in Fig. 1 from impeller side.
Fig. 6 wants portion's sectional arrangement drawing near the foreign matter drain passageway that amplifies in the presentation graphs 2.
Embodiment
Mode of execution 1
Based on accompanying drawing, mode of execution involved in the present invention 1 is described.
At first, with reference to Fig. 1, the mechanical structure of petrolift is described.As shown in Figure 1, petrolift 10 is made of motor part 70 and pump portion 12.
Fig. 2 extracts the pump portion among Fig. 1 12 and illustrate enlargedly out.Pump portion 12 has housing 18 and impeller 20.
As shown in Figure 3, impeller 20 is for roughly discoid.On the suction side of impeller 20, form the 1st blade groove group 20b that constitutes by the upward continuous recess group of Zhou Fangxiang with ring-type across the distance of regulation with outer circumferential face 20e.That is, the outer circumferential face 20e of the 1st blade groove group 20b and impeller 20 is separated by the periphery wall 20d of impeller 20.On the discharge side of impeller 20, in the position corresponding (promptly with the 1st blade groove group 20b on the suction side that is formed at impeller 20, and between the outer circumferential face 20e across the zone of distance of regulation) locate, be formed with by Zhou Fangxiang with ring-type and go up the 2nd blade groove group 20c that continuous recess group constitutes.In addition, the bottom of the bottom of the 1st blade groove group 20b and the 2nd blade groove group 20c is communicated with by intercommunicating pore (omitting diagram).At the central part of impeller 20, form the card complex hole 20a of impenetrating thickness direction, its with the rectangular direction of axle on section be D word shape roughly.Axle 78 engages with card complex hole 20a.If to the coil electricity of rotor 76, then axle 78 rotations make impeller 20 rotations thus.
On the bottom surface (hereinafter referred to as " lower surface of pump cover 14 ") of the recess 14a of pump cover 14, on the zone relative, form the 2nd pump path 31 of the groove shape that extends along Zhou Fangxiang with the 2nd blade groove group 20c of impeller 20.The upstream extremity 31a of the 2nd pump path 31, be formed on the position relative with the upstream extremity 30a of the 1st pump path 30 described later near.On the downstream 31b of the 2nd pump path 31, form fuel discharge outlet 41.Fuel discharge outlet 41 extends to the upper surface (upper surface of Fig. 1) of pump cover 14 from the 2nd pump path 31, and the outside (that is the motor part 70 in the shell 72) of the 2nd pump path 31 and housing 18 is communicated with.
Between the recess 14a of impeller 20 and pump cover 14, form the axial micro-gap shown in the A among Fig. 6, and, between the inner peripheral surface 14b of the recess 14a of impeller 20 and pump cover 14, form the micro-gap shown in the B among Fig. 6.These gaps are provided with for impeller 20 is successfully rotated.
In addition, as Fig. 2, shown in Figure 5, at the face relative of pump cover 14, be on the bottom surface of recess 14a, form the recess 14c that overlooks to circle with impeller 20.The diameter of recess 14c is littler than the diameter of impeller 20.The degree of depth of recess 14c is compared minimum with the thickness of impeller 20, becomes gradually greatly to the center from outer circumferential side, and be the degree of tens μ m at the interior perimembranous place of recess 14c.Therefore, the lower surface of pump cover 14 is the concave shape to downside.
In addition, schematically expression is amplified in the gap between impeller 20 and the pump cover 14 among the figure, but actual degree for number μ m～tens of μ m.
On the recess 14a of pump cover 14, be formed for enlarging the foreign matter drain passageway 100 in gap, its with outer circumferential face 20e that is clipped in impeller 20 and the 2nd blade groove group 20c between the relative position of periphery wall on, and the sense of rotation P along impeller observes, and is positioned on the circumference outside the part from downstream 31b to upstream extremity 31a of removing the 2nd pump path 31.
The degree of depth of foreign matter drain passageway 100 is compared greatly with axial clearance A between the recess 14a of impeller 20 and pump cover 14, and is less than or equal to the radial clearance B (with reference to Fig. 6) that the inner peripheral surface 14b by the recess 14a of the outer circumferential face 20e of impeller 20 and pump cover 14 forms.
The width of the radial direction of foreign matter drain passageway 100, near the downstream 31b of the 2nd pump path 31 towards the 2nd pump path 31 narrow down lentamente (with reference to Fig. 5).
In addition, the outer circumferential side bight 100a of foreign matter drain passageway 100 carries out chamfering or rounding as shown in Figure 2.
As Fig. 2, shown in Figure 4, on the face (that is, the face of the upside of Fig. 1) of impeller 20 sides of the pump housing 16, form the recess 16a that overlooks to circle.The diameter of recess 16a is littler than the diameter of impeller 20.The degree of depth of recess 16a is compared minimum with the thickness of impeller 20, becomes gradually greatly to the center from outer circumferential side, and at the interior perimembranous place of recess 16a the degree of number μ m.Therefore, the upper surface of the pump housing 16 is the concave shape to upside.
At the upper surface of the pump housing 16, on the zone relative, form along the 1st pump path 30 of the groove shape of Zhou Fangxiang extension with the 1st blade groove group 20b of impeller 20.On the upstream extremity 30a of the 1st pump path 30, fuel suction port 40 is set.Between the upstream extremity 30a of the 1st pump path 30 and downstream 30b steam escape hole 30c is set, (Fig. 1 about) runs through the pump housing 16 about it.Central part at the upper surface 16a of the pump housing 16 forms recess 16b, in recess 16b, disposes thrust-bearing 33 with one heart with axle 78.The thrust loading of thrust-bearing 33 bear rotor 76.
Be formed for enlarging the foreign matter drain passageway 101 in gap at the outer circumferential side of the 1st pump path 30 of the pump housing 16, its with outer circumferential face 20e that is clipped in impeller 20 and the 1st blade groove group 20b between the relative position of periphery wall 20d on, and the sense of rotation P along impeller observes, and is removing on the downstream 30b and the circumference beyond the part between the upstream extremity 30a that is clipped in the 1st pump path 30.The inner peripheral surface 14b of the recess 14a of the outer circumference diameter of foreign matter drain passageway 101 and said pump cover 14 is complementary.
The degree of depth of foreign matter drain passageway 101 is compared greatly with axial clearance A between the recess 14a of impeller 20 and pump cover 14, and is less than or equal to the radial clearance B (with reference to Fig. 6) that the inner peripheral surface 14b by the recess 14a of the outer circumferential face 20e of impeller 20 and pump cover 14 forms.
The width of the radial direction of foreign matter drain passageway 101, near the downstream 30b of the 1st pump path 30 towards the 1st pump path 30 narrow down lentamente (with reference to Fig. 4).
In addition, the outer circumferential side bight 101a of foreign matter drain passageway 101 carries out chamfering or rounding as shown in Figure 2.
Housing 18 (comprising the pump cover 14 and the pump housing 16) is under the state behind the impeller 20 of packing in the recess 14a of pump cover 14, by with the lower end 72b of shell 72 calking to the inside, and is fixed on the shell 72.
In addition, under the state that housing 18 is fixed on the shell 72, axle 78 underpart 78b, the position comparing with the position of being supported by bearing 82 below more close is inserted among the card complex hole 20a of impeller 20.Between the lower end and the pump housing 16 of axle 78, installed thrust bearing 33 (with reference to Fig. 1).
In above-mentioned petrolift 10, if make electric current flow through rotor 76, thereby make impeller 20 rotations, then the fuel in the fuel tank (omitting diagram) is sucked in the housing 18 by fuel suction port 40.Be sucked into the fuel in the housing 18, at first, flow into the upstream extremity 30a of the 1st pump path 30.As shown in Figure 6, flow into the fuel in the 1st pump path 30, by the rotation of impeller 20, and form eddy flow S between the 1st pump path 30 and the 1st blade groove group 20b, pressure thus raises.In addition, flow into the fuel in the 1st pump path 30, by the rotation of impeller boost on one side, in the 1st pump path 30, flow on one side from upstream extremity 30a downstream end 30b.Therefore, by centrifugal force, separate to the radial direction outside of impeller sneaking into foreign matter in fuel (to compare proportion bigger with fuel).
Isolated foreign matter is flowed in the foreign matter drain passageway 101 that is formed on the pump housing 16 by eddy flow S extrusion, by foreign matter drain passageway 101, flows into the downstream 30b of the 1st pump path 30.Foreign matter by pump cover 14 recess 14a and the gap B between the outer circumferential face 20e of impeller 20 flow, discharge to motor part 70 from the fuel discharge outlet 41 of the downstream 31b of the 2nd pump path 31 that is positioned at pump cover 14.
Because the axial clearance A between the recess 14a of the degree of depth of foreign matter drain passageway 101 and impeller 20 and pump cover 14 compares greatly, so foreign matter is to above-mentioned axial clearance A inflow, and optionally to 101 inflows of foreign matter drain passageway.In addition, because the degree of depth of foreign matter drain passageway 101 is less than or equal to the radial clearance B that the outer circumferential face 20e by the recess 14a of pump cover 14 and impeller 20 forms, so the pressure that can suppress to be caused by the fuel leak from above-mentioned radial clearance B descends, and make foreign matter waltz through above-mentioned radial clearance B simultaneously, and be directed to fuel discharge outlet 41.
On the other hand, flow into to the 2nd blade groove group 20c by intercommunicating pore (omitting diagram) from the 1st blade groove group 20b of impeller 20, and flow into foreign matter in the 2nd pump path 31 of pump cover 14, the also centrifugal force that produces by rotation in the same manner by impeller 20, and separate to the radial direction outside of impeller.Isolated foreign matter flows in the foreign matter drain passageway 100 that is formed on the pump cover 14, by foreign matter drain passageway 100, from the fuel discharge outlet 41 of the downstream 31b that is positioned at the 2nd pump path 31 to motor part 70 discharges.
Because the width of the radial direction of foreign matter drain passageway 100 narrows down towards the 2nd pump path 31 near the downstream 31b of the 2nd pump path 31, lentamente so foreign matter along the outer circumferential face of foreign matter drain passageway 100, successfully is directed to fuel discharge outlet 41.In addition, because the outer circumferential side bight 100a of foreign matter drain passageway 100 is carried out chamfering or rounding,, foreign matter is piled up in path so in the path section, do not have the position that makes flow velocity slack-off.Foreign matter drain passageway 101 has these effects too.
Be formed on the outside because foreign matter drain passageway 100,101 is compared with the periphery of impeller 20, be not subjected to centrifugal force and contact with impeller 20 from the foreign matter that the interior outer circumferential sides of foreign matter drain passageway 100,101 flow through so can not make on one side.Therefore, impeller 20 can not be rotated with foreign matter contiguously, thus rotational resistance can be suppressed for lower, thus can successfully rotate.
The fuel that the fuel discharge outlet 41 of the downstream by being formed at the 2nd pump path 31 is discharged to motor part 70 flows motor part 70 in, from being formed at the exhaust port 73a on the engine casing (Eng Cas) 73, discharge outside petrolift 10.
In above-mentioned petrolift 10, by on the internal surface of housing 18, forming foreign matter drain passageway 100,101, foreign matter in the fuel is separated from the 1st pump path the 30, the 2nd pump path 31, can suppress the wearing and tearing of the internal surface of the impeller that causes by the foreign matter in the fuel 20 and/or housing 18.Thus, fuel leak from the 1st pump path 30 and the 2nd pump path 31 etc. can be prevented, the pump efficiency of petrolift 10 can be kept chronically.
In addition, in above-mentioned petrolift 10, owing to only on the pump housing 16 and pump cover 14, form the fuel drain tank, so existing structure (parts) can be used in other positions.
In addition, because the upper surface 16a of the pump housing 16 is made as concave shape, so can make the impeller 20 can run-off the straight in rotation.
In addition, in the above-described embodiment, be formed at the foreign matter drain passageway 100,101 on the internal surface of housing 18, be to be formed at respectively on the pump housing 16 and the pump cover 14, but also can only on a certain side, form.
In addition, various distortion of the present invention or change, do not depart from the scope of the present invention with thought in, can realize by relevant those of skill in the art, be interpreted as the mode of execution that is not limited to put down in writing in this specification.
Claims (6)
1. petrolift, it has: roughly discoid impeller, it is rotated by motor part; And housing, it rotatably accommodates described impeller,
On the positive and negative of described impeller, with periphery on the zone that the distance of regulation is extended along Zhou Fangxiang in the inboard, form respectively by Zhou Fangxiang and go up the 1st blade groove group and the 2nd blade groove group that continuous recess group constitutes,
With the internal surface of the positive relative described housing of described impeller on, with the right zone of described the 1st blade groove faciation on form the 1st pump path that extends to downstream from upstream extremity,
On the internal surface of the described housing relative with described impeller reverse side, with the right zone of described the 2nd blade groove faciation on form the 2nd pump path that extends to downstream from upstream extremity,
On described housing, be formed with: fuel suction port, it is with near upstream extremity of described the 1st pump path and the external communications of described housing; And fuel discharge outlet, it is near downstream of described the 2nd pump path and the external communications of described housing,
This petrolift is characterised in that,
On the described shell inner surface relative, form the foreign matter drain passageway with described impeller, its with the periphery that is clipped in described impeller and the 1st blade groove group, the 2nd blade groove group between regional relative position on, and the sense of rotation along described impeller is observed, be positioned at and remove from described fuel discharge outlet on the circumference beyond the part till the described fuel suction port, this foreign matter drain passageway is used for the foreign matter of will sneak in the fuel that sucks from described fuel suction port in described housing, discharge to described fuel discharge outlet.
2. petrolift as claimed in claim 1 is characterized in that,
The degree of depth of described foreign matter drain passageway greater than the axial clearance between described impeller and the described housing, and is less than or equal to radial clearance between described impeller and the described housing.
3. petrolift as claimed in claim 1 or 2 is characterized in that,
The radial width of described foreign matter drain passageway narrows down near described fuel discharge outlet lentamente.
4. petrolift as claimed in claim 1 or 2 is characterized in that,
Chamfering or rounding are carried out in outer circumferential side bight to described foreign matter drain passageway.
5. petrolift as claimed in claim 1 or 2 is characterized in that,
The pump cover that described housing comprises the pump housing with described fuel suction port and has described fuel discharge outlet forms circular recess on the face of the described impeller side of described pump cover, the thickness of this concave depth and described impeller is roughly the same.
6. petrolift as claimed in claim 5 is characterized in that,
Form circular recess on the bottom surface of described recess, its diameter is less than the diameter of described impeller, and its degree of depth gradually becomes big from outer circumferential side to the center less than the thickness of described impeller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008322347A JP2010144609A (en) | 2008-12-18 | 2008-12-18 | Fuel pump |
| JP2008-322347 | 2008-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101749153A true CN101749153A (en) | 2010-06-23 |
Family
ID=42476661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910161951A Pending CN101749153A (en) | 2008-12-18 | 2009-09-07 | Fuel pump |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2010144609A (en) |
| CN (1) | CN101749153A (en) |
| TW (1) | TW201024529A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590942A (en) * | 2013-10-24 | 2014-02-19 | 安徽工贸职业技术学院 | Fuel pump running reliably |
| CN104040180A (en) * | 2011-10-13 | 2014-09-10 | 三菱电机株式会社 | Fuel pump |
| CN108071609A (en) * | 2016-11-11 | 2018-05-25 | 明和工业株式会社 | Water pump |
| CN113423956A (en) * | 2019-01-16 | 2021-09-21 | 株式会社美姿把 | Non-positive displacement pump and liquid supply device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140093398A1 (en) * | 2012-09-28 | 2014-04-03 | Remy Technologies, L.L.C. | Electric machine including a shaft having a pump vane |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5378404A (en) * | 1976-12-22 | 1978-07-11 | Shibaura Eng Works Ltd | Wesco pump |
| JPS6394095A (en) * | 1986-10-09 | 1988-04-25 | Japan Electronic Control Syst Co Ltd | Turbine type fuel pump |
| JP2005240643A (en) * | 2004-02-25 | 2005-09-08 | Toyota Motor Corp | Fuel pump |
-
2008
- 2008-12-18 JP JP2008322347A patent/JP2010144609A/en active Pending
-
2009
- 2009-02-06 TW TW98103804A patent/TW201024529A/en unknown
- 2009-09-07 CN CN200910161951A patent/CN101749153A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104040180A (en) * | 2011-10-13 | 2014-09-10 | 三菱电机株式会社 | Fuel pump |
| CN103590942A (en) * | 2013-10-24 | 2014-02-19 | 安徽工贸职业技术学院 | Fuel pump running reliably |
| CN108071609A (en) * | 2016-11-11 | 2018-05-25 | 明和工业株式会社 | Water pump |
| CN113423956A (en) * | 2019-01-16 | 2021-09-21 | 株式会社美姿把 | Non-positive displacement pump and liquid supply device |
| CN113423956B (en) * | 2019-01-16 | 2024-02-02 | 株式会社美姿把 | Non-positive displacement pump and liquid supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010144609A (en) | 2010-07-01 |
| TW201024529A (en) | 2010-07-01 |
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| C10 | Entry into substantive examination | ||
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| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20100623 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |