CN208886379U - A kind of air compressor machine - Google Patents

A kind of air compressor machine Download PDF

Info

Publication number
CN208886379U
CN208886379U CN201821396719.1U CN201821396719U CN208886379U CN 208886379 U CN208886379 U CN 208886379U CN 201821396719 U CN201821396719 U CN 201821396719U CN 208886379 U CN208886379 U CN 208886379U
Authority
CN
China
Prior art keywords
cylinder
tank body
output shaft
motor
brush holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201821396719.1U
Other languages
Chinese (zh)
Inventor
张涛
杨树发
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Tengjing Air Compressor Co Ltd
Original Assignee
Zhejiang Tengjing Air Compressor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Tengjing Air Compressor Co Ltd filed Critical Zhejiang Tengjing Air Compressor Co Ltd
Priority to CN201821396719.1U priority Critical patent/CN208886379U/en
Application granted granted Critical
Publication of CN208886379U publication Critical patent/CN208886379U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Drying Of Gases (AREA)

Abstract

The utility model discloses a kind of air compressor machines, it is related to air compression field, the main points of its technical scheme are that: including tank body, the compression cylinder being set on tank body, the intracorporal end of tank is equipped with the first cylinder, the output shaft of first cylinder is equipped with first motor, the output shaft of motor is located at away from the side of the first cylinder, and mounting blocks are fixedly connected on the output shaft of motor, the lateral wall of mounting blocks is equipped with several first dehumidifying brushes, first dehumidifying brush includes the first brush holder support being connected on mounting blocks, it is wrapped in the first suction head of the first brush holder support end, first suction head fits on the inner sidewall of tank body;Pass through the first cylinder of setting and first motor, so that the first dehumidifying brush rotates the steam to be condensed on side wall in tourie body in all directions while the axial direction along tank body moves and along the circumferential direction of tank body, and then the steam of tank interior can be reduced, corrosion of the water body to tank body inner sidewall is advantageously reduced, the service life of tank body is improved.

Description

A kind of air compressor machine
Technical field
The utility model relates to air compression field, in particular to a kind of air compressor machine.
Background technique
Air compressor machine is a kind of equipment to compressed gas, and existing air compressor machine such as notification number is the one of CN205135954U Kind Chinese utility model patent is fixed with mounting rack, mounting rack top it discloses a kind of air compressor machine, including tank body on tank body It is fixed with the cylinder for compressed air, the end of tank body is equipped with the handle for carrying air compressor machine.
In use, the intracorporal gas of suction tank can contain wetly above-mentioned air compressor machine, and gas is in the mistake of compression Cheng Zhong, moisture can be in contact with the inner sidewall of tank body, and gradually condense into steam and be attached on the inner sidewall of tank body, so that empty Press easily makes tank interior by the corrosion of steam during prolonged use, and the service life of tank body is caused to reduce.
Utility model content
In view of the deficienciess of the prior art, having and reducing the purpose of this utility model is to provide a kind of air compressor machine The steam of tank interior improves the advantage of tank body service life.
The above-mentioned technical purpose of the utility model has the technical scheme that a kind of air compressor machine, including Tank body, the compression cylinder being set on tank body, the intracorporal end of tank are equipped with the first cylinder, the output shaft of first cylinder It is equipped with first motor, the output shaft of the motor is located at away from the side of the first cylinder, and solid on the output shaft of the motor Surely mounting blocks are connected with, the lateral wall of the mounting blocks is equipped with several first dehumidifying brushes, and the first dehumidifying brush includes connection In on the mounting blocks the first brush holder support, be wrapped in the first suction head of first brush holder support end, the first suction head patch Together in the inner sidewall of the tank body.
Through the above technical solutions, can be driven by the first cylinder of starting when needing the inner sidewall to tank body to dehumidify Dynamic first motor is moved back and forth along the axial direction of tank body, is simultaneously started first motor and is driven mounting blocks rotation, mounting blocks The first dehumidifying brush rotation is driven, so that circumferential direction of first suction head while axial direction along tank body moves and along tank body The steam that direction is rotated to be condensed on side wall in tourie body in all directions, and then the steam of tank interior can be reduced, favorably In reducing corrosion of the water body to tank body inner sidewall, the service life of tank body is improved.
Preferably, installation cavity is offered in the mounting blocks, the cavity wall of the installation cavity is equipped with the second motor, and described the The output shaft of two motors is fixedly connected with the first umbrella tooth towards the first motor direction, and on the output shaft of second motor Wheel, first brush holder support are worn far from the end of first suction head to the installation cavity, and the first brush holder support is located at installation The second bevel gear is fixedly connected on intracavitary lateral wall, second bevel gear is mutually perpendicular to nibble with first bevel gear It closes.
Through the above technical solutions, the second motor of starting drives the first umbrella tooth when first motor driving mounting blocks rotation The rotation of wheel, the first bevel gear drive the rotation of the second bevel gear, and the second bevel gear can drive the rotation of the first suction head at this time, To increase the mixing area of the first suction head, the water suction vapour speed of the first suction head is improved.
Preferably, first brush holder support is equipped with several second dehumidifying brushes, institute close to the lateral wall of first suction head Stating the second dehumidifying brush includes the second brush holder support and the second suction head, and the shape between the first dehumidifying brush is brushed in second dehumidifying At a certain angle, the second suction head fitting is in same on the inner sidewall of the tank body and with first suction head On horizontal plane.
Through the above technical solutions, the second dehumidifying brush is along the first brush holder support when the second bevel gear drives the rotation of the first brush holder support It is circumferentially rotated, the second suction head can carry out water suction processing to the tank body inner sidewall on the first suction head periphery at this time, into one Step improves the absorption efficiency to steam on tank body inner sidewall while increasing water vapor absorption area.
Preferably, the first drying chamber being connected with first suction head is offered in first brush holder support, described The second drying chamber being connected with second suction head, first drying chamber and second drying are offered in two brush holder supports It is intracavitary to be filled with lime desiccant, and the lime desiccant extends in first suction head and the second suction head.
Through the above technical solutions, after the first suction head and the second suction head sucking steam, it is dry by setting lime Agent, so that the first suction head enters in lime desiccant with the steam on the second suction head further to be absorbed, this When can reduce the presence of steam in the first suction head and the second suction head, the first suction head and the second suction head still can be at this time Continue to absorb steam, and then the use time of the first dehumidifying brush and the second dehumidifying brush can be improved.
Preferably, first brush holder support offers link slot on the lateral wall of first suction head, several described Second brush holder support is connected to the slot bottom of the link slot.
Through the above technical solutions, being connected during several second brush holder supports are fixed on the first brush holder support by setting Slot can play the role of a positioning to the fixation of several second brush holder supports.
Preferably, water absorption plate is additionally provided in the tank body, the output shaft of first cylinder is worn to the water absorption plate Middle part, and the water absorption plate is located at close to the first cylinder side of the first motor, the end abutment of the water absorption plate is in institute It states on the inner sidewall of tank body.
Through the above technical solutions, during cylinder pushes first motor movement, first motor output shaft to first In this section of distance of cylinder output shaft and the first cylinder contact side, the steam on tank body inner sidewall not can be removed, and pass through setting Water absorption plate, so that water absorption plate can remove the steam on the tank body inner sidewall in this section of distance during the first cylinder moving It removes, to be further reduced the intracorporal steam of tank.
Preferably, the water absorption plate include the fixing seat being set on the first cylinder output shaft, be articulated with it is described solid The end of several soft water suction seats on reservation lateral wall, the soft water suction seat fits in the inner sidewall of the tank body, described The actuator for driving the soft water suction seat to move towards first cylinder direction is additionally provided on the output shaft of first cylinder.
Through the above technical solutions, can be driven by actuator soft when the output shaft of the first cylinder returns to initial position Property water suction seat rotate towards the first cylinder direction, with absorption the first cylinder circumferential portion tank body inner sidewall on steam.
Preferably, the actuator include the second cylinder being set on the first cylinder output shaft, be set to it is described Driving frame on second cylinder output shaft, the end of the driving frame are connected on the side wall of several soft water suction seats.
Through the above technical solutions, several soft water suction seats are linked together, and pass through the by setting driving frame Two cylinders are driven, to improve the synchronism of soft water suction seat movement.
Preferably, several springs are fixedly connected between soft water suction seat and the lateral wall of first cylinder.
Through the above technical solutions, by the way that several springs are arranged, to play the role of a pulling force to soft water suction seat, and During second cylinder drives soft water suction seat to reset, the speed resetted can be increased by spring.
In conclusion the utility model has the following beneficial effects:
By setting the first cylinder and first motor so that the first dehumidifying brush moved in the axial direction along tank body it is same When and rotate steam to be condensed on side wall in tourie body in all directions along the circumferential direction of tank body, and then tank can be reduced The steam in internal portion, advantageously reduces corrosion of the water body to tank body inner sidewall, improves the service life of tank body.
Detailed description of the invention
Fig. 1 is the overall structure figure of embodiment, and the overall structure of embodiment is shown for emphasis;
Fig. 2 is tank interior structure chart in embodiment, and the internal structure of tank body is shown for emphasis;
Fig. 3 is the overall structure figure of tank interior dehumidifying part, and the entirety of tank interior dehumidifying part is shown for emphasis Structure;
Fig. 4 is the enlarged drawing in the portion A in Fig. 3, and the filling position of lime desiccant is shown for emphasis;
Fig. 5 is the side view of tank interior dehumidifying part, and the structure of water absorption plate is shown for emphasis.
Appended drawing reference: 1, tank body;11, compression cylinder;12, driving motor;13, pressure switch;2, the first cylinder;21, One motor;3, mounting blocks;31, installation cavity;32, the second bevel gear;4, the first dehumidifying brush;41, the first brush holder support;411, first is dry Chamber;412, link slot;42, the first suction head;5, the second motor;51, the first bevel gear;6, the second dehumidifying brush;61, the second brush Bar;611, the second drying chamber;62, the second suction head;7, lime desiccant;8, water absorption plate;81, fixing seat;82, soft water suction Seat;83, ventilation space;9, actuator;91, the second cylinder;92, frame is driven;921, drive disk;922, column is driven;10, spring.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
Referring to Fig. 1, a kind of air compressor machine, including tank body 1, the compression cylinder being set on tank body 1 11 and driving motor 12, Pressure switch 13, the arc-shaped shape in the both ends of tank body 1 are equipped between compression cylinder 11 and driving motor 12.
Referring to fig. 2, the both ends of 1 inside arc shape of tank body are horizontal is equipped with the first cylinder 2, the output shaft end of the first cylinder 2 Portion is fixedly connected with first motor 21, and the output shaft of first motor 21 is located at away from the side of the first cylinder 2, and first motor 21 Output shaft on be fixedly connected with mounting blocks 3, be uniformly fixed with along circumferential direction on the lateral wall of mounting blocks 3 it is several first dehumidifying 4 are brushed, the quantity of the first dehumidifying brush 4 is preferably three in the present embodiment;First dehumidifying brush 4 includes the be connected on mounting blocks 3 One brush holder support 41 is wrapped in first suction head 42 of first brush holder support 41 far from 3 end of mounting blocks, the first suction head 42 in the present embodiment It is preferred that being made of water suction cotton material, and the first suction head 42 fits in the inner sidewall of tank body 1 far from the end of the first brush holder support 41 On.
Referring to fig. 2, Fig. 3 offers installation cavity 31 in mounting blocks 3, in installation cavity 31 in the cavity wall far from first motor 21 It is horizontally fixed with the second motor 5, the output shaft of the second motor 5 is towards 21 direction of first motor, and on the output shaft of the second motor 5 It is fixedly connected with the first bevel gear 51, the first brush holder support 41 is worn far from the end of the first suction head 42 to installation cavity 31, and the The second bevel gear 32, the second bevel gear 32 and the first bevel gear are fixedly connected on the end that one brush holder support 41 is located in installation cavity 31 51 are mutually perpendicular to engage.
First brush holder support 41 offers link slot 412, link slot on the lateral wall of the first suction head 42 along circumferential direction 412 slot bottom is fixedly connected with along the circumferential direction of the first brush holder support 41 in several second dehumidifying brushes 6 being arranged at equal intervals, this implementation The quantity of the second dehumidifying brush 6 is preferably again three in example;Second dehumidifying brush 6 includes being fixed on the second of 412 slot bottom of link slot Brush holder support 61 is set to second suction head 62 of second brush holder support 61 far from 41 end of the first brush holder support, the second suction head in the present embodiment 62 of water suction cotton material also, it is preferred that be made;Shape is at a certain angle between second dehumidifying brush 6 and the first dehumidifying brush 4, this reality Applying angle in example is preferably acute angle, and the second suction head 62 fits on the inner sidewall of tank body 1 far from the end of the second brush holder support 61, and Second suction head 62 and the first suction head 42 are in same level.
Referring to Fig. 3, Fig. 4, the first brush holder support 41 is offered far from the end of mounting blocks 3 to be connected with inside the first suction head 42 The first drying chamber 411, the second brush holder support 61 offers to be connected with the second suction head 62 far from the end of the first brush holder support 41 Lime desiccant 7 is filled in two drying chambers 611, the first drying chamber 411 and the second drying chamber 611, lime desiccant 7 extends It contacts with each other to the first suction head 42 and the second suction head 62, and with absorbent wool;When the first suction head 42 and the second suction head After 62 draw the steam on 1 inner sidewalls of tank body, can further it be absorbed by lime desiccant 7, so that the first suction head 42 and the Two suction heads 62 are dried again, in order to continue to absorb other steam.
Referring to fig. 2, Fig. 5 is additionally provided with water absorption plate 8 in tank body 1, and the diameter of water absorption plate 8 is identical as the diameter of tank body 1, water suction The side wall of disk 8 fits on 2 side wall of the first cylinder of first motor 21, and the output shaft of the first cylinder 2 wears and fixes In the middle part of water absorption plate 8, the end abutment of 8 circumferencial direction of water absorption plate is on the inner sidewall of tank body 1;Water absorption plate 8 includes being set to Fixing seat 81 on first cylinder, 2 output shaft, several soft water suction seats 82 for surrounding and being articulated on 81 lateral wall of fixing seat, Gu There are ventilation space 83 between reservation 81 and several soft water suction seats 82, soft water suction seat 82 preferably uses sponge in the present embodiment Rubber material is made, and soft water suction seat 82 is fitted in far from the end of fixing seat 81 on the inner sidewall of tank body 1.
Referring to Fig. 3, Fig. 5, it is additionally provided with actuator 9 on the output shaft of the first cylinder 2, actuator 9 is located at water absorption plate 8 away from the On the output shaft of one cylinder, 2 side, actuator 9 is for driving soft water suction seat 82 to rotate towards 2 direction of the first cylinder;Actuator 9 Including the second cylinder 91 being fixed on 2 output shaft of the first cylinder, the driving frame 92 being set on 91 output shaft of the second cylinder,
Driving frame 92 includes the drive disk 921 that is fixed on 91 output shaft of the second cylinder and is set to the back of drive disk 921 Several driving columns 922 from 91 side of the second cylinder, the middle part that 91 output shaft of the second cylinder passes through drive disk 921 make drive disk 921 slidings are connected on the output shaft of the second cylinder 91, and driving column 922 extends and is fixedly connected on towards soft 82 direction of water suction seat On soft water suction seat 82, and each driving column 922 and each soft water suction seat 82 correspond;Each soft water suction seat 82 Spring 10, the both ends point of spring 10 are fixedly connected on towards the side wall of the first cylinder 2 between the lateral wall of the first cylinder 2 Not Di Jin in soft water suction seat 82 and the first cylinder 2, and when water absorption plate 8 be in perpendicular to the first cylinder 2 state when, spring 10 In a state of nature.
The working principle of the present embodiment:
When needing the inner sidewall to tank body 1 to dehumidify, first motor 21 can be driven along tank by the first cylinder 2 of starting The axial direction of body 1 moves, and starts first motor 21 and the second motor 5 simultaneously, and first motor 21 drives mounting blocks 3 to rotate, Mounting blocks 3 drive the first dehumidifying brush 4 to rotate along the circumferential direction of tank body 1, and the second motor 5 drives the rotation of the first bevel gear 51, the One bevel gear 51 drives the rotation of the second bevel gear 32, and the second bevel gear 32 drives 41 rotation of the first brush holder support, and makes the second dehumidifying brush 6 It is circumferentially rotated along the first brush holder support 41, so that the first suction head 42 and the second suction head 62 draw 1 inside of tank body in all directions The steam condensed on wall;And during the driving of the first cylinder 2, water absorption plate 8 can be to 21 output shaft of first motor to first 1 inner sidewall of tank body in cylinder this section of distance of 2 output shaft absorbs water;
In addition after the output shaft of the first cylinder 2 returns to initial position, the second cylinder 91 drives soft water suction seat 82 towards The movement of one cylinder, 2 direction, the steam on 1 inner sidewall of arc shape tank body to absorb 2 circumferential portion of the first cylinder, to realize to tank Water vapor absorption processing on 1 inner sidewall of body on each position.
This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability Field technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but As long as all by the protection of Patent Law in the scope of the claims of the utility model.

Claims (9)

1. a kind of air compressor machine, including tank body (1), the compression cylinder (11) being set on tank body (1), it is characterized in that: the tank body (1) end in is equipped with the first cylinder (2), and the output shaft of first cylinder (2) is equipped with first motor (21), the motor Output shaft be located at away from the side of the first cylinder (2), and mounting blocks (3), institute are fixedly connected on the output shaft of the motor The lateral wall for stating mounting blocks (3) is equipped with several first dehumidifying brushes (4), and the first dehumidifying brush (4) includes being connected to the peace The first suction head (42) for filling the first brush holder support (41) on block (3), being wrapped in the first brush holder support (41) end, described first inhales Head (42) fits in the inner sidewall of the tank body (1).
2. a kind of air compressor machine according to claim 1, it is characterized in that: installation cavity (31) are offered in the mounting blocks (3), The cavity wall of the installation cavity (31) is equipped with the second motor (5), and the output shaft of second motor (5) is towards the first motor (21) direction, and the first bevel gear (51) are fixedly connected on the output shaft of second motor (5), first brush holder support (41) End far from first suction head (42) is worn to the installation cavity (31), and the first brush holder support (41) is located at installation cavity (31) it is fixedly connected on the lateral wall in the second bevel gear (32), second bevel gear (32) and first bevel gear (51) it is mutually perpendicular to engage.
3. a kind of air compressor machine according to claim 1, it is characterized in that: first brush holder support (41) is close to first water suction The lateral wall of head (42) is equipped with several second dehumidifying brushes (6), and the second dehumidifying brush (6) includes the second brush holder support (61) and the Two suction heads (62), and to brush shape between (4) at a certain angle for the second dehumidifying brush (6) and first dehumidifying, described the Two suction heads (62) fitting is in same level on the inner sidewall of the tank body (1) and with first suction head (42) On.
4. a kind of air compressor machine according to claim 3, it is characterized in that: being offered in first brush holder support (41) and described the The first drying chamber (411) that one suction head (42) is connected, second brush holder support (61) is interior to be offered and second suction head (62) it is filled in the second drying chamber (611) being connected, first drying chamber (411) and second drying chamber (611) Have lime desiccant (7), and the lime desiccant (7) extends to first suction head (42) and the second suction head (62) It is interior.
5. a kind of air compressor machine according to claim 3, it is characterized in that: first brush holder support (41) is close to first water suction It is offered link slot (412) on the lateral wall of head (42), several second brush holder supports (61) are connected to the link slot (412) Slot bottom.
6. a kind of air compressor machine according to claim 1, it is characterized in that: being additionally provided with water absorption plate (8), institute in the tank body (1) The output shaft for stating the first cylinder (2) is worn to the middle part of the water absorption plate (8), and the water absorption plate (8) is located at close to described the The first cylinder (2) side of one motor (21), the end abutment of the water absorption plate (8) is on the inner sidewall of the tank body (1).
7. a kind of air compressor machine according to claim 6, it is characterized in that: the water absorption plate (8) includes being set to described first Fixing seat (81) on cylinder (2) output shaft, several soft water suction seats (82) being articulated on the fixing seat (81) lateral wall, The end of soft water suction seat (82) fits in the inner sidewall of the tank body (1), goes back on the output shaft of first cylinder (2) Equipped with the actuator (9) for driving soft water suction seat (82) to move towards the first cylinder (2) direction.
8. a kind of air compressor machine according to claim 7, it is characterized in that: the actuator (9) includes being set to described first The second cylinder (91) on cylinder (2) output shaft, the driving frame (92) being set on the second cylinder (91) output shaft, it is described The end of driving frame (92) is connected on the side wall of several soft water suctions seat (82).
9. a kind of air compressor machine according to claim 7, it is characterized in that: the soft water suction seat (82) and first cylinder (2) several springs (10) are fixedly connected between lateral wall.
CN201821396719.1U 2018-08-28 2018-08-28 A kind of air compressor machine Expired - Fee Related CN208886379U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821396719.1U CN208886379U (en) 2018-08-28 2018-08-28 A kind of air compressor machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821396719.1U CN208886379U (en) 2018-08-28 2018-08-28 A kind of air compressor machine

Publications (1)

Publication Number Publication Date
CN208886379U true CN208886379U (en) 2019-05-21

Family

ID=66510222

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201821396719.1U Expired - Fee Related CN208886379U (en) 2018-08-28 2018-08-28 A kind of air compressor machine

Country Status (1)

Country Link
CN (1) CN208886379U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109237298A (en) * 2018-08-28 2019-01-18 浙江藤井空压机有限公司 A kind of air compressor machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109237298A (en) * 2018-08-28 2019-01-18 浙江藤井空压机有限公司 A kind of air compressor machine
CN109237298B (en) * 2018-08-28 2024-05-24 浙江藤井空压机有限公司 Air compressor

Similar Documents

Publication Publication Date Title
CN115244351A (en) Textile oven capable of continuously drying cloth in reciprocating mode
CN208886379U (en) A kind of air compressor machine
CN112044871B (en) Computer motherboard chip surface cleaning equipment
CN109237298A (en) A kind of air compressor machine
CN209156337U (en) A kind of mechanical feed dries in the air a batch machine dust-extraction unit
CN214770926U (en) Decorate engineering with dustless wall equipment of polishing
CN202021186U (en) Liquid receiver washing machine for hydraulic dampers
CN211258945U (en) Protection mechanism for air compressor machine shell
JP2012229641A (en) Air compressor
CN212977982U (en) Sand blasting fixture device
CN213178671U (en) A intelligent air regenerating device for architectural decoration
CN215325930U (en) Cleaning and winding device for food packaging bag production
CN210757101U (en) Steel bottle inner wall grinder with noise reduction effect
CN205008315U (en) Self -service electrostatic precipitator
CN211758841U (en) Cutting device is used in processing of nonrust steel pipe of having seam
CN108007077A (en) A kind of dewatering device
CN209239753U (en) A kind of steel plate materials derusting device
CN207012712U (en) A kind of electrified dust arrester
CN210831412U (en) Air compressor
CN214308110U (en) Turnover type reaction crystallization, filtration, washing and drying machine
CN208659161U (en) Round brush, scrubbing brush and dust catcher for scrubbing brush
CN216205088U (en) Precooling and module drying integrated machine
CN219152562U (en) Grinder with dust collection and dust removal structure
CN221270743U (en) Polishing device for decoration engineering
CN211355215U (en) Dust collector

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20190521

Termination date: 20210828

CF01 Termination of patent right due to non-payment of annual fee