DLA MIL-DTL-151 F-2010 FANS CIRCULATING CEILING REFRIGERATED SPACE.pdf

1、AMSC N/A FSC 4140 INCH-POUND MIL-DTL-151F 2 MARCH 2010 SUPERSEDING MIL-F-151E 5 August 1968 DETAIL SPECIFICATION FANS, CIRCULATING, CEILING, REFRIGERATED SPACE INACTIVE FOR NEW DESIGN AFTER 4 APRIL 1998 This specification is approved for use by all Departments and Agencies of the Department of Defen

2、se. 1. SCOPE 1.1 Scope. This specification covers nonoscillating class HI (High Impact) shockproof fans suitable for ceiling mounting in refrigerated storage space onboard surface ships. 1.2 Classification. Fans will be of the following classes and types, as specified (see 6.2): Class 1. Magnetic. T

3、ype I Single speed, 115 volts alternating current (a.c.). Type II Single speed, 115 volts direct current (d.c.). Class 2. Nonmagnetic. Type I NM Single speed, 115 volts a.c. Type II NM Single speed, 115 volts d.c. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specifie

4、d in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they mus

5、t meet all specified requirements of documents cited in section 3 and section 4 of this specification, whether or not they are listed. Comments, suggestions, or questions on this document should be addressed to Defense Supply Center Philadelphia, ATTN: DSCP-NASA, 700 Robbins Avenue, Philadelphia, PA

6、 19111-5096 or email to dscpg and Packing Assemblies; General Specification for MIL-I-24768/1 - Insulation, Plastic, Laminated, thermosetting, Glass-Cloth, Melamine-Resin (GME) MIL-I-24768/17 - Insulation, Plastic, Laminated, Thermosetting, Glass-Cloth, Silicone-Resin (GSG) DEPARTMENT OF DEFENSE STA

7、NDARDS MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited) (Copies of these documents are available online at http:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, P

8、A 19111-5094.) 2.3 Non-Government publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR QUALITY (ASQ) ASQ Z1.4 - Sampling

9、Procedures and Tables for Inspection by Attributes (Copies of this document are available from www.asq.org or the American Society for Quality, 611 East Wisconsin Avenue, Milwaukee, WI 53202.) ASTM INTERNATIONAL ASTM A342/A342M - Standard Test Methods for Permeability of Feebly Magnetic Materials (C

10、opies of this document are available from www.astm.org or ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.) NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA) NEMA CB 1 - Brushes for Electrical Machines (Copies of this document are available from www.nema.o

11、rg or from the National Electrical Manufacturers Association, 1300 North 17thStreet; Suite 1752, Rosslyn, VA 22209.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the reference cited herein, the text of thi

12、s document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-151F 33. REQUIREMENTS 3.1 Preproduction

13、sample. Prior to production, a fan of each class and type offered for delivery, constructed in accordance with an approved drawing (see 3.23), shall be examined, tested and approved as specified in 4.2. 3.2 Material. The material shall be of the best commercial quality and suitable in every respect

14、for the purpose intended. Cast iron shall not be used. 3.2.1 Class 1 magnetic fans. When class 1 fans are specified (see 6.2), the parts may be constructed of paramagnetic materials satisfactory to the procuring activity concerned. 3.2.2 Class 2 nonmagnetic fans. When class 2 fans are specified (see

15、 6.2), all parts except the magnetic circuit shall be of nonmagnetic material. Nonmagnetic material is defined as material which has a maximum permeability of less than 2.0 after fabrication. 3.3 Blades and guards. 3.3.1 Blades. Fans shall have not less than three blades of the diameter specified (s

16、ee 3.18), which shall be corrosion-resisting metal, polished and lacquered; or (for class 1 fans only) of a metal treated in a manner, satisfactory to the procuring activity to resist corrosion and finished to match frame, base, and guard; or of a laminated plastic approved by the procuring activity

17、 conforming to MIL-I-24768/1 or MIL-I-24768/17. Fan blades shall be of such design that normal cleaning and dusting will not result in their being bent out of alignment. When mounted as shown on figure 1, the plane of rotation of the fan blades shall be parallel to the ceiling. 3.3.2 Guard. The guar

18、d shall be corrosion-resisting metal, polished and lacquered; or (for class 1 fans only) of a metal treated in a manner satisfactory to the procuring activity to resist corrosion and finished to match frame, blades, and base. It shall be sufficiently rugged to prevent distortion under normal operati

19、ng conditions and shall adequately protect personnel from injury. The guard shall be securely fastened to the motor frame by screws or other means to permit ready removal and it shall not vibrate excessively when the fan is in operation. 3.4 Fan characteristics and mounting. 3.4.1 Characteristics. T

20、he characteristics of the fan shall be such that the air will be drawn from the area directly below the blades and delivered in a plane parallel to the ceiling when mounted as shown on figure 1. 3.4.2 Mounting. Fans shall be designed for mounting in an overhead position, either directly or by means

21、of an auxiliary bracket, as shown on figure 1. 3.4.2.1 Mounting holes. The fan assembly shall have at least 4 mounting holes. The mounting shall be solid. Grommets or isolation mounts shall not be used. 3.5 Motor. 3.5.1 Bearings. The bearings shall be self-lubricating, and shall be so designed as to

22、 prevent dripping and throwing of the lubricating compound. Bearing may be ball or sleeve type. 3.5.2 Temperature rise. The temperature rise of the motor, when measured by a thermometer in contact with the windings, shall not exceed 40 Centigrade (C), and when measured by a change in resistance shal

23、l not exceed 50 C. 3.5.3 A. c. motors. The design shall be such that no commutators, collector rings, or any automatic starting devices shall be used. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-151F 418 INCHES5 FEETMAXIMUM VELOCITYTO BE

24、DETERMINEDWITHIN THIS SPACE.FLOORCEILINGFigure 1 Mounting. 3.5.4 D. c. motors. 3.5.4.1 Brushes. Brushes shall be rectangular in shape and shall conform to NEMA CB1 except that the brand marking may be omitted. The sides of the brushes shall be smooth and free from saw marks. 3.5.4.2 Brush holders. B

25、rush holders shall be readily accessible for the renewal of brush or spring. The brush-feeding device shall insure proper brush contact under all conditions of brush and commutator wear. The brush holder caps shall be so constructed that no live parts are exposed. 3.5.4.3 Commutator. The commutator

26、shall be of sufficient depth to allow turning down to an extent of 0.10 inch reduction in diameter. The insulation between commutator bars shall be undercut. 3.6 Voltage. The fans shall be designed for operation on 115 volts, single phase, 60 cycles a.c. or 115 volts d.c. as specified (see 6.2). Fan

27、s shall operate satisfactorily in accordance with the requirements of this specification between the limits of 105 and 125 volts. 3.7 Operating temperatures. Fans shall operate satisfactorily over an ambient temperature range from minus 18 C (0 F) to 38 C (100 F). The fans shall start and run smooth

28、ly at minimum rated voltage while in an ambient temperature of minus 18 C after having remained idle in an ambient temperature of minus 18 C for 24 hours. The fans shall also start and run smoothly at minimum rated voltage while in an ambient temperature of 38 C after having remained in an ambient t

29、emperature of 38 C for 4 hours. 3.8 Input. The power input at rated voltage shall not exceed 35 watts. The power input of any individual fan shall not vary more than 15 percent from the average obtained when samples (see 4.3.1) are tested as specified in 4.4.4. 3.9 Speed. The speed of any individual

30、 fan shall not vary more than 5 percent from the average speed obtained when samples (see 4.3.1) are tested as specified in 4.4.3. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-151F 53.10 Shock. Fans shall be designed to withstand the shock

31、 tests specified in 4.4.13. 3.11 Mechanical balance and audible noise. Fans shall be dynamically balanced and shall operate without objectionable noise at rated speed. 3.12 Output. The air output shall be such that the average velocity of the air delivered (see 4.4.7) shall be not less than 75 feet

32、per minute, when measured at a radius of 5 feet from the center of the fan. 3.13 Terminal boxes. A metal terminal box shall be furnished, mounted as part of the fan assembly. The box shall be of such size that undue crowding of the connections between the motor leads and the incoming cable will not

33、result. Each box shall be provided with a 1.26 inch diameter hole to accommodate a size 4, stuffing tube in accordance with MIL-S-19622. Each box shall also be equipped with a metal cover which shall be secured by machine bolts. 3.14 Life. Fans shall operate satisfactorily in accordance with the req

34、uirements specified herein at rated voltage without showing defects or undue wear, when tested as specified in 4.4.12. At the end of the life period specified, the wear shall not have exceeded the following: (a) Commutator: 0.030 inch in diameter. (b) Sleeve bearings: 0.003 inch in diameter. (c) Bru

35、shes shall not be worn to the extent of causing the fan to become inoperative during the life test (see 4.4.12). 3.15 Dielectric. The insulation shall withstand the dielectric test specified in 4.4.5. 3.16 Insulation resistance. 3.16.1 The insulation resistance shall be not less than 16 megohms when

36、 measured in accordance with 4.4.2. 3.16.2 The insulation resistance shall be not less than 2 megohms when measured in accordance with 4.4.10. 3.17 Electromagnetic interference. When required, electromagnetic interference shall be as specified (see 6.2). 3.18 Weight and dimensions. The weight and di

37、mensions of the fan shall not exceed those specified in table I. Table I. Weight and dimensions. Projection downward Weight from mounted position Blade diameter 14 pounds 9 inches 8 inches 3.19 Grounding. An electric conducting path shall exist between all exposed metal parts and mounting. In the ca

38、se where the fan motor is electrically isolated from the mounting (for example, in rubber grommets for noise isolation purposes), a stranded wire shall be used for grounding purposes. This wire shall be sufficiently long so that there will always be slack regardless of the fan position. It shall be

39、of at least the same cross-sectional area as each wire which supplies power to the motor, and shall be secured in such a manner that it will not become entangled in any part of the fan assembly. 3.20 Vibration. Fans shall be designed to withstand type I, (environmental) vibration as specified in MIL

40、- STD-167-1. 3.21 Designation and marking. 3.21.1 Designation. The Government designation for the fans shall be shown as type I, type II, type INM or type IINM. The class of fan shall not be shown. 3.21.2 Identification plates. Identification plates and other designating marking shall be provided in

41、 accordance Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-151F 6with type A, B, C, or D of MIL-DTL-15024, except that aluminum alloy or plastic material will not be permitted. These plates shall be installed on and furnished as a part of th

42、e equipment for which they are intended. They shall be attached to the part of the equipment which will not ordinarily be renewed during its normal service life, and shall be located in a readily accessible position where they can be read at all times without danger to personnel. 3.21.3 Identificati

43、on plate markings. Data marked on identification plates shall include the information specified in MIL-DTL-15024, the character of current and the voltage and Federal stock number. 3.22 Finish. The frame, base and guard shall be given a prime coat of zinc-chromate primer conforming to TT-P-645, or a

44、ny equally suitable primer approved by the procuring activity, and a coat of smooth, durable, baked-on enamel conforming to type III, class 2 of MIL-E-15090. 3.23 Drawings. Drawings shall be submitted to the procuring activity concerned for approval prior to the preproduction tests. Certification da

45、ta shall not be furnished. Previously approved drawings need not be resubmitted. 3.23.1 Class 1 fans, type I and II. A list of material shall not be required. Drawings shall contain the following information: (a) An outline drawing giving front and side view, dimensions and mounting hole diameter an

46、d spacing. (b) Brush length, width, and thickness, and number of brushes per stud, number of studs, manufacturers and Navy grade, and name of manufacturer. (c) File number and date of the shock test report and file number and date of the Governments letter forwarding the report. (d) Weight of comple

47、te fan in pounds. (e) List of insulation materials. (f) Material and thickness of fan blade. (g) Type of bearings if ball bearings, manufacturers name and identification. (h) Detail showing means provided for installing incoming cable. (i) Permissible reduction in commutator diameter. (j) Nominal po

48、wer input and speed. (k) Schematic circuit diagram. (l) Test number and date of the test report applicable to the fan. 3.23.2 Class 2 fans, types INM and IINM. Drawings shall contain the information specified in 3.23.1 and the following: (a) Sectional view, with additional detailed and sectional vie

49、ws as necessary, showing and identifying all parts of the fan. (b) A list of material, as required. (c) Material identification of all metal parts. (d) Unit weights of all magnetic parts (parts whose permeability is equal to or greater than 2.0 after fabrication). 3.24 Repair parts. When required (see 6.2), the following repair parts shall be provided: 1 set of brushes and 1 set of brush springs for each d.c. fan. (When brushes are supplied wi