Relay ammeter

Abstract

The utility model discloses a relay ammeter, which relates to the technical field of ammeters, and comprises a meter body used for measuring current or voltage in a circuit, and the meter body is provided with a swinging pointer; the device further comprises a light-emitting element, a photosensitive element, a separation blade and a relay. The light-emitting element projects light to the swing range of the pointer of the watch body. The photosensitive element receives light projected by the light-emitting element; the blocking piece is connected with the pointer and swings along with the pointer, and the photosensitive element is located on the rear side of the swing range of the blocking piece. The relay is connected in the circuit, receives a signal of the photosensitive element and controls the on-off of the circuit; according to the utility model, the separation blade swinging along with the pointer is arranged, the position of the separation blade is detected through the light-emitting element and the photosensitive element, and on-off of the circuit is controlled through the relay according to the position of the pointer, thereby realizing dual functions of measurement and control and ensuring circuit safety.

Description

Technical Field

[0001] The utility model relates to the technical field of electric meters, in particular to a relay electric meter. Background Art

[0002] Ordinary pointer-type electrical measuring instruments can only be used to measure current or voltage in a circuit. When the current value or voltage value in the circuit exceeds the threshold range, the circuit will have certain risks. To protect the circuit, the circuit must be cut off immediately and work must be stopped. However, traditional pointer-type electrical measuring instruments cannot realize on-off control of the circuit based on their measurement results. Utility Model Content

[0003] The purpose of the utility model is to provide a relay meter in order to solve the above problems in the prior art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A relay meter comprises a meter body for measuring current or voltage in a circuit, the meter body having a swinging pointer; and also comprises:

[0006] A light emitting element projects light into the swing range of the pointer of the meter body;

[0007] A photosensitive element, receiving light projected by the light-emitting element;

[0008] A baffle is connected to the pointer and swings with the pointer, and the photosensitive element is located at the rear side of the swing range of the baffle;

[0009] The relay is connected in the circuit, receives the signal from the photosensitive element and controls the on and off of the circuit;

[0010] When the baffle blocks the photosensitive element, the relay receives the signal from the photosensitive element and cuts off the circuit.

[0011] Furthermore, the light emitting element is a light emitting diode.

[0012] Furthermore, the photosensitive element is a phototransistor.

[0013] Furthermore, the blocking piece is an arc-shaped copper foil piece.

[0014] Furthermore, the number of the photosensitive elements and the number of the relays are both two, the two photosensitive elements correspond to the two relays respectively, and there is a gap between the two photosensitive elements.

[0015] Furthermore, the position of the photosensitive element is adjustable.

[0016] Furthermore, a swing arm is provided in the watch body, one end of the swing arm is rotatably connected to the watch body, and a photosensitive element is installed at the other end; the swing arm is connected to a knob for adjusting the swing angle of the swing arm.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] The utility model is provided with a baffle that swings with the pointer, detects the position of the baffle by means of a light emitting element and a photosensitive element, and controls the on and off of the circuit by means of a relay according to the position of the pointer, thereby realizing the dual functions of measurement and control and ensuring the circuit safety;

[0019] The utility model has two groups of photosensitive elements and relays, which can react and control the upper and lower limits of the pointer swing, so that the current or voltage in the circuit works normally when it is within the normal range, and the circuit is quickly cut off when it exceeds the upper and lower limits of the normal range; the position of the photosensitive element of the utility model can be adjusted, and the range of the control current or voltage can be adjusted accordingly, so that measurement and protection control can be realized in different circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the front view of the meter body of the utility model.

[0021] Figure 2 It is the principle diagram of the utility model.

[0022] Figure 3 It is a schematic side view of the meter body of the utility model.

[0023] Figure 4 It is a rear view schematic diagram of the meter body of the utility model.

[0024] Figure 5 It is a side view schematic diagram of the swing arm connection structure of the utility model.

[0025] In the figure: 1. meter body; 2. light-emitting element; 3. photosensitive element; 4. baffle; 5. relay; 6. swing arm; 7. knob; 8. transmission mechanism; 9. damper; 10. spindle; 101. pointer; 102. arc hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] The present invention is further described in detail below in conjunction with the embodiments.

[0030] The specific embodiment of the relay meter provided by the utility model:

[0031] See also Figure 1-5 The relay meter includes a meter body 1 for measuring the current or voltage in the circuit, and the meter body 1 has a swinging pointer 101; in this embodiment, the meter body 1 adopts an ammeter, which can be connected to the circuit and used to measure the current in the circuit to be protected. The pointer 101 in the meter body 1 swings with the change of the current. The ammeter for measuring the current is a prior art, and its working principle is not described in detail in this embodiment. In some other embodiments, the meter body 1 can adopt a voltmeter for measuring the voltage in the circuit.

[0032] A light emitting element 2 is placed on the front side of the ammeter body 1, i.e., outside the transparent shell of the dial. The light emitting element 2 is a light emitting diode. The two poles of the light emitting diode are connected to a 12V power supply, which supplies power to the light emitting diode, causing the light emitting diode to emit light and project light toward the swing range of the pointer 101 of the meter body 1.

[0033] Two photosensitive elements 3 are arranged in the watch body 1; specifically, an arc hole 102 is arranged on the dial, and the arc hole 102 corresponds to the swing range of the pointer 101 and the arc range of the scale on the dial. In this embodiment, the photosensitive element 3 is a phototransistor. Transparent glass can be installed in the arc hole 102 for light transmission. There is a gap between the two photosensitive elements 3, and both are located inside the arc hole 102, and can receive the light projected by the light-emitting element 2.

[0034] An arc-shaped baffle 4 is installed on the pointer 101, and the baffle 4 swings with the pointer 101; the baffle 4 is made of an arc-shaped copper foil, and the copper foil in the prior art can be very thin and light, and has little effect on the swing of the pointer 101. The baffle 4 swings in front of the arc-shaped hole 102, that is, the photosensitive element 3 is located at the rear side of the swing range of the baffle 4. When the baffle 4 swings to the front of the photosensitive element 3, it can block the light emitted by the light-emitting element 2, so that the photosensitive element 3 reacts.

[0035] In this embodiment, two relays 5 are connected in the protected circuit to receive signals from two photosensitive elements 3 and control the on and off of the circuit respectively; the number of photosensitive elements 3 and relays 5 are both two, and the two photosensitive elements 3 correspond to the two relays 5 respectively; the positions of the two photosensitive elements 3 are used to define the upper and lower limits of the current in the circuit. The pointer 101 drives the baffle 4 to swing, and when the baffle 4 swings between the two photosensitive elements 3, that is, the current is within the normal range, the circuit works normally. When the baffle 4 blocks the upper limit photosensitive element 3 or the lower limit photosensitive element 3, the light received by the photosensitive element 3 is significantly reduced, such as Figure 2 As shown in the schematic diagram, the photosensitive element 3 sends a signal to the corresponding relay 5, and the relay 5 receives the signal from the photosensitive element 3 and cuts off the circuit, so that the circuit stops working, thereby protecting the circuit. In this way, the pointer 101 swings and changes its position, that is, the current changes, to protect the circuit, so that the circuit works within the normal current range. If the current in the circuit exceeds the range, the relay 5 immediately cuts off the circuit.

[0036] In order to meet the measurement and protection requirements of circuits with different current ranges, in this embodiment, the positions of the two photosensitive elements 3 can be adjusted. A swing arm 6 is provided in the meter body 1, one end of the swing arm 6 is rotatably connected to the meter body 1, and the other end is equipped with the photosensitive element 3; the swing arm 6 is connected to a knob 7 for adjusting the swing angle of the swing arm 6, and the knob 7 swings the swing arm 6 through a transmission mechanism 8. For details, see Figure 5 , the knob 7 is rotatably connected to the meter body 1, two knobs 7 are provided, and each knob 7 is connected to a gear. A fixed mandrel 10 is installed in the meter body 1, and there are two swing arms 6, each of which is provided with two photosensitive elements 3; the lower end of each swing arm 6 is connected to a gear, and the gears at the lower end of the swing arm 6 are rotatably sleeved on the outer side of the mandrel 10. The gears of the two knobs 7 are respectively meshed with the gears at the lower ends of the two swing arms 6, that is, in this embodiment, two groups of transmission mechanisms 8 are provided, and each group of transmission mechanisms 8 includes a pair of meshing gears, so that by rotating the knob 7, the swing arm 6 can be rotated through the transmission mechanism 8, thereby changing the position of the photosensitive element 3, adjusting the current range required for the normal operation of the circuit, and then being suitable for circuits with different current requirements.

[0037] In some embodiments, a damper 9 is installed on the outer side of the inner end of the knob 7. The damper 9 forms friction damping on the rotation of the knob 7 and plays a positioning role. When there is no external force, the damper 9 keeps the swing arm 6 stationary. Only when the knob 7 is driven to rotate and the resistance of the damper 9 is overcome can the swing arm 6 be driven to swing, thereby changing the position of the photosensitive element 3.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A relay meter, comprising a meter body (1) for measuring current or voltage in a circuit, the meter body (1) having a swinging pointer (101); characterized in that: Also includes: A light emitting element (2) projects light onto the swing range of the pointer (101) of the meter body (1); A photosensitive element (3) receives light projected by the light-emitting element (2); A baffle (4) is connected to the pointer (101) and swings along with the pointer (101), and the photosensitive element (3) is located at the rear side of the swing range of the baffle (4); A relay (5) is connected to the circuit, receives the signal from the photosensitive element (3) and controls the on and off of the circuit; When the blocking piece (4) blocks the photosensitive element (3), the relay (5) receives a signal from the photosensitive element (3) and cuts off the circuit.

2. The relay meter according to claim 1, characterized in that: The light-emitting element (2) is a light-emitting diode.

3. The relay meter according to claim 1, characterized in that: The photosensitive element (3) is a phototransistor.

4. The relay meter according to claim 1, characterized in that: The baffle (4) is an arc-shaped copper foil.

5. The relay meter according to claim 1, characterized in that: The number of the photosensitive elements (3) and the number of the relays (5) are both two, and the two photosensitive elements (3) correspond to the two relays (5) respectively; there is a gap between the two photosensitive elements (3).

6. The relay ammeter according to claim 1 or 5, characterized in that: The position of the photosensitive element (3) is adjustable.

7. The relay ammeter according to claim 6, characterized in that: A swing arm (6) is provided in the watch body (1); one end of the swing arm (6) is rotatably connected to the watch body (1) and the other end is mounted with a photosensitive element (3); the swing arm (6) is connected to a knob (7) for adjusting the swing angle of the swing arm (6).

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