CN212008739U

CN212008739U - Digital clamp meter

Info

Publication number: CN212008739U
Application number: CN201922146624.5U
Authority: CN
Inventors: 吴清源; 黄志刚; 陈志宏; 曾繁建
Original assignee: ZHANGZHOU YUSHAN ELECTRONIC MANUFACTURING CO LTD
Current assignee: ZHANGZHOU YUSHAN ELECTRONIC MANUFACTURING CO LTD
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-11-24
Anticipated expiration: 2029-12-04

Abstract

The utility model relates to a digital clamp meter, which comprises a meter upper cover and a meter lower cover, wherein the meter upper cover and the meter lower cover are spliced to form a meter body of a multi-purpose meter; the upper end of the meter body upper cover is provided with a left tong head and a right tong head in a left-right distribution mode, plastic winding frames are arranged in the left tong head and the right tong head, a plurality of inwards concave winding grooves are formed in the outer side wall of each plastic winding frame in a spaced mode, a lead is wound in each winding groove to form an induction coil, and the induction coils on the two plastic winding frames are matched to form a current transformer; a printed circuit board is fixed in the watch body upper cover, a battery bin is arranged on the side edge of the printed circuit board, and a positive spring and a negative spring which are electrically connected with the printed circuit board are fixedly arranged in the battery bin; and two plastic winding frames are respectively sleeved with a plastic plug at one end close to the jaw.

Description

Digital clamp meter

Technical Field

The utility model relates to a digital clamp meter belongs to and exchanges clamp meter technical field.

Background

The current digital AC pincerlike multimeter on the market has the working principle that: based on the working principle of the current transformer, when the pincer-shaped ammeter wrench is held tightly, the iron core of the current transformer is opened, and a lead of a measured current enters the jaw to be used as a primary winding of the current transformer. After the wrench is loosened, the iron core is closed, induction current can be generated on a secondary winding of the wrench according to the principle of the mutual inductor, and the value of the current to be measured is converted and displayed through an internal circuit. However, magnetic saturation exists for a certain shape and volume of iron core, namely nonlinear distortion exists when the test current is high, therefore, the maximum test current of the AC clamp meter in the market can only be measured by 1000A basically, and the iron core of the clamp meter for measuring the AC current must be opened and closed, the iron core is difficult to be completely sealed on the structure of the opening and closing part, when a user tests, if a test lead is close to the opening and closing part, a larger magnetic leakage phenomenon exists, therefore, these products have a large position error problem, many products have a specification that requires the test lead to be placed at the center of the test clamp head, some product specifications may specifically specify that an additional position error of 2.5% is required to be added to the test lead when the test lead is not at the center (e.g., product MS2033A), and the safety of the electronic product during the manufacturing process requires a creepage distance: -design criteria for the shortest distance between live conductors along the insulating surface. For the product with higher safety level, the design of the structure is more difficult because of the existence of the iron core.

In addition, most common AC pincerlike watches in the market have the watch body with the thickness of 25-45mm and the weight of 200-400 g, and the watch body has large size and weight, so that the watch body feels heavy when being held by a hand, the operation is inconvenient by one hand, and the use experience is influenced. Although some products are light and thin in the market, such as a clamp meter CM3280, the weight is only 100 g, and the thickness is 16mm, in order to reduce the thickness of the watch body, 1 CR2032 button battery is used in the product, the endurance time is short, and the battery needs to be replaced frequently; by using a thin knob structure, a plastic rib for shifting the knob is very short and sharp, the function of switching gears is inconvenient, and the hand feels painful.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model provides an AC pincerlike multimeter, which is provided with a plastic winding frame made of plastic, a plurality of winding grooves are arranged on the plastic winding frame, which is convenient for winding and positioning coils, so that coil winding groups are relatively uniformly distributed in the plastic winding frame similar to a circular ring, the defect that the position error of the upper end and the lower end is larger when the actual measurement is carried out because the binding clip has no magnetic conduction function of an iron core and cannot be caused by winding coils within a certain range away from a jaw part according to safety requirements is overcome, and the actual position measurement error of the multimeter is greatly reduced; the silicon steel sheet iron core is not adopted in the tong head, so that the weight of the whole machine is reduced, and the tong head is light and thin; the silicon rubber key is adopted for cyclic switching, and a knob, a turntable and a slideway structure are not adopted, so that the thickness of the whole machine is reduced, and the one-hand operation is convenient; 2 AA batteries are serially connected and placed in a built-in battery bin on the side edge of the printed circuit board, so that the thickness of the watch body can be reduced, and the longer endurance time can be guaranteed.

The technical scheme of the utility model as follows:

a digital clamp meter comprises a meter upper cover and a meter lower cover, wherein the meter upper cover and the meter lower cover are spliced to form a meter body of a multi-purpose meter; the upper end of the meter body upper cover is provided with a left tong head and a right tong head in a left-right distribution mode, plastic winding frames are arranged in the left tong head and the right tong head, a plurality of inwards concave winding grooves are formed in the outer side wall of each plastic winding frame in a spaced mode, a lead is wound in each winding groove to form an induction coil, and the induction coils on the two plastic winding frames are matched to form a current transformer; a printed circuit board is fixed in the watch body upper cover, a battery bin is arranged on the side edge of the printed circuit board, and a positive spring and a negative spring which are electrically connected with the printed circuit board are fixedly arranged in the battery bin; and two plastic winding frames are respectively sleeved with a plastic plug at one end close to the jaw.

Furthermore, a triangular convex part is arranged at the top of the left tong head or the right tong head and is used for poking away the barrier when the electrified conductor is measured; a reserved cavity is formed in the convex part.

Further, the printed circuit board comprises a function selection circuit, and the function selection circuit is used for switching the measurement function of the multi-purpose meter; and the upper cover of the watch body is provided with a silica gel key used for triggering the function selection circuit.

Further, an LCD display screen is arranged on the meter body upper cover and electrically connected with the printed circuit board.

Further, a wrench is arranged at the lower end of the right tong head; spring fixing columns penetrate through the left tong head and the right tong head at positions far away from the tong openings, the spring fixing columns in the left tong head penetrate out of one ends, used for fixing springs, of the two ends of the left tong head, and the spring fixing columns in the right tong head penetrate out of the other ends, used for fixing the springs, of the two ends of the right tong head.

Furthermore, a first gear part is arranged at a position, far away from the jaw, of the left tong head, a second gear part is arranged at a position, far away from the jaw, of the right tong head, and the first gear part is meshed with the second gear part.

The utility model discloses following beneficial effect has:

1. the utility model relates to a digital clamp meter sets up the plastics bobbin that plastics were made, set up several wire winding groove on the plastics bobbin, make things convenient for the coil around establishing and fixing a position, make coil winding group evenly distributed relatively in the plastics bobbin that is similar to the ring, compensate because of the binding clip does not have the magnetic conduction effect of iron core and in response to the requirement for safety can not have the bigger defect of the position error of lower extreme during the actual measurement that the coil coiling arouses apart from the jaw department certain limit, the actual position measuring error of greatly reduced universal meter.

2. The utility model relates to a digital pincerlike meter adopts plastics bobbin, prevents the magnetic saturation phenomenon.

3. The utility model relates to a digital pincerlike meter, plastics bobbin holder are equipped with the plastics end cap in upper jaw department one end, can satisfy the internal circuit to the safety requirement of keeping silent dual insulation, accomplish higher security level.

4. The utility model relates to a digital pincerlike meter realizes that the table body is light, thin, and silica gel button key circulation switches the function, can lightly one-hand operation, and adopts 2 sections AAA battery power supplies, compromises the duration of an instrument.

5. The utility model relates to a digital clamp meter, the inside headspace of binding clip can adorn NCV response piece, wire, convenient follow-up extension NCV test function.

Drawings

FIG. 1 is a schematic view of the overall structure of the inside of the watch body in the embodiment;

fig. 2 is a schematic structural view of the plastic bobbin in the embodiment;

FIG. 3 is a schematic structural view of the exterior of the watch body in the embodiment;

FIG. 4 is a schematic structural view of the jaw assembly according to the embodiment;

FIG. 5 is a sectional view of the watch case and the input shaft of the embodiment;

fig. 6 is a schematic diagram of a stylus used in the embodiment.

The reference numbers in the figures denote:

1. a left binding clip; 101. a convex portion; 102. reserving a cavity; 103. a first gear portion; 2. a right binding clip; 201. a wrench; 202. a second gear portion; 3. a plastic bobbin; 301. a winding slot; 4. a AAA battery; 5. a positive electrode spring; 6. a negative spring; 7. a printed circuit board; 8. an input column; 9. a shaft sleeve; 10. a watch body upper cover; 1001. a battery compartment; 11. a plastic plug; 12. A silica gel key; 13. an LCD display screen; 14. a meter pen; 15. a spring; 16. a watch body lower cover; 18. the spring fixes the column.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-6, a digital clamp meter comprises a meter upper cover 10, a meter lower cover 16, an input column 8 and a shaft sleeve 9, wherein the meter upper cover 10 and the meter lower cover 16 are spliced to form a meter body of a multi-purpose meter; a left binding clip 1 and a right binding clip 2 are distributed on the left and right of the upper end of the watch body upper cover 10, plastic winding frames 3 are arranged in the left binding clip 1 and the right binding clip 2, a plurality of inward concave winding grooves 301 are formed in the outer side wall of each plastic winding frame 3 at intervals, a lead is wound in each winding groove 301 to form an induction coil, and the induction coils on the two plastic winding frames 3 are matched to form a current transformer; a printed circuit board 7 is fixed in the watch body upper cover 10, a battery bin 1001 is arranged on the side edge of the printed circuit board 7, 2 AAA batteries 4 are connected in series and placed in the battery bin 1001, and a positive spring 5 and a negative spring 6 which are electrically connected with the printed circuit board 7 are fixedly arranged in the battery bin 1001; and one end of each plastic winding frame 3 close to the jaw is sleeved with a plastic plug 11.

Further, a triangular convex part 101 is arranged at the top of the left tong head 1 or the right tong head 2, and the convex part 101 is used for poking away an obstacle when measuring a live conductor; a reserved cavity 102 is formed in the convex part 101; the reserved cavity 102 can be provided with an NCV induction sheet and a lead, so that the subsequent expansion of the NCV test function is facilitated.

Further, the printed circuit board 7 includes a function selection circuit therein, and the function selection circuit is used for switching the measurement function of the multi-purpose meter; the watch body upper cover 10 is provided with a silica gel key 12 for triggering the function selection circuit.

Further, an LCD display screen 13 is arranged on the watch body upper cover 10, and the LCD display screen 13 is electrically connected with the printed circuit board 7.

Further, a wrench 201 is arranged at the lower end of the right binding clip 2; spring fixing columns 18 penetrate through the left tong head 1 and the right tong head 2 at positions far away from the tong mouths, the spring fixing columns 18 in the left tong head 1 penetrate through two ends of the left tong head 1 to be used for fixing one end of a spring 15, and the spring fixing columns 18 in the right tong head 2 penetrate through two ends of the right tong head 1 to be used for fixing the other end of the spring 15; the two sides of the tong head are both provided with springs 15, the springs 15 are double-hook ring pressure center cylindrical spiral extension springs, the hooks at the two ends of the springs are respectively fixed at the end parts of two spring fixing columns 18, and the end parts of the spring fixing columns 18 are provided with hooks for preventing the springs 15 from falling off.

Further, a first gear part 103 is arranged at the position, far away from the jaw, of the left tong head 1, a second gear part 202 is arranged at the position, far away from the jaw, of the right tong head 2, and the first gear part 103 is meshed with the second gear part 202.

The working principle of the utility model is as follows:

a coil is wound on the plastic bobbin 3; get a section enameled wire, define the end of a thread as the initiating terminal, the end of a thread reserves a section length, begin to wind from the winding groove 301 of keeping away from 3 tail ends of plastics bobbin holder of jaw department and establish the coil, from up wind the winding groove 301 of establishing to jaw department down, again heavily down wind the winding groove 301 of establishing back the first winding that begins, end the coiling of plastics bobbin holder 3, each groove wire winding is even, and the number of turns is the same.

After the winding is completed, the two plastic winding frames 3 are respectively sleeved with the plastic plugs 11 at one ends of the winding grooves 307 at the jaw, and then are respectively installed in the left tong head 1 and the right tong head 2.

The winding method of the embodiment can ensure that the coil windings are relatively uniformly distributed on the plastic winding frame 3 similar to a circular ring, so as to make up for the defects that the position errors of the upper end and the lower end are larger during actual measurement due to the fact that the binding clip does not have the magnetic conduction function of an iron core and the coil cannot be wound within a certain range away from the jaw according to the safety requirement, and the actual position measurement error of a product can be controlled within 1% after the method is adopted for debugging.

The plastic plug 11 is additionally arranged on the plastic winding frame 3, so that the creepage distance and the electric clearance from an internal circuit to the jaw are increased, the requirement of double insulation is met, and the product reaches a higher safety level.

The plastic winding frame 3 is made of plastic, a traditional silicon steel sheet laminated iron core is not adopted, the number of turns of a winding wire is less, and meanwhile, a high-strength plastic shell is adopted, so that the shell wall is thin, the weight of the binding clip is light, and the overall thickness dimension is thin.

The silica gel key 12 is adopted to trigger the function selection circuit, the switched function state can be checked through the LCD display screen 12, the traditional knob, turntable and slideway structure is replaced, the one-hand operation can be realized, and the instrument function can be switched conveniently; on the premise that the CAT III 600V safety requirement is met and the input plug of the meter pen 14 is matched with the input column on the meter body reliably, the input column 8 and the shaft sleeve 9 which are lower in height are adopted, the meter pen 14 with the shorter input plug is matched, and the thickness of the meter body is prevented from being increased.

By adopting the measures, the watch body is light, thin, portable and easy to use.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A digital clamp meter, comprising: the multifunctional watch comprises a watch body upper cover (10) and a watch body lower cover (16), wherein the watch body upper cover (10) and the watch body lower cover (16) are spliced to form a watch body of the multifunctional watch; the upper end of the watch body upper cover (10) is provided with a left tong head (1) and a right tong head (2) in a left-right distribution mode, plastic winding frames (3) are arranged in the left tong head (1) and the right tong head (2), a plurality of inward-concave winding grooves (301) are formed in the outer side wall of each plastic winding frame (3) at intervals, a lead is wound in each winding groove (301) to form an induction coil, and the induction coils on the two plastic winding frames (3) are matched to form a current transformer; a printed circuit board (7) is fixed in the watch body upper cover (10), a battery bin (1001) is arranged on the side edge of the printed circuit board (7), and a positive spring (5) and a negative spring (6) which are electrically connected with the printed circuit board (7) are fixedly arranged in the battery bin (1001); and one end of each plastic winding frame (3) close to the jaw is sleeved with a plastic plug (11).

2. A digital clamp meter according to claim 1, wherein: the top of the left tong head (1) or the right tong head (2) is provided with a triangular convex part (101), and the convex part (101) is used for poking away an obstacle when a live conductor is measured; a reserved cavity (102) is formed in the convex part (101).

3. A digital clamp meter according to claim 1, wherein: the printed circuit board (7) comprises a function selection circuit which is used for switching the measurement function of the multi-purpose meter; and a silica gel key (12) used for triggering the function selection circuit is arranged on the watch body upper cover (10).

4. A digital clamp meter according to claim 1, wherein: the watch body upper cover (10) is provided with an LCD display screen (13), and the LCD display screen (13) is electrically connected with the printed circuit board (7).

5. A digital clamp meter according to claim 1, wherein: a wrench (201) is arranged at the lower end of the right tong head (2); spring fixing columns (18) penetrate through the left tong head (1) and the right tong head (2) at positions far away from the tong openings, the spring fixing columns (18) in the left tong head (1) penetrate through two ends of the left tong head (1) to be used for fixing one ends of springs (15), and the spring fixing columns (18) in the right tong head (2) penetrate through two ends of the right tong head (2) to be used for fixing the other ends of the springs (15).

6. A digital clamp meter according to claim 1, wherein: a first gear part (103) is arranged at a position, far away from a jaw, of the left tong head (1), a second gear part (202) is arranged at a position, far away from the jaw, of the right tong head (2), and the first gear part (103) is meshed with the second gear part (202).