Protection relay and double parallel starter

Abstract

The utility model discloses a protection relay and a double parallel starter, belonging to the starter technology field, the protection relay comprises a protector and a relay, the protector comprises a control circuit, a first lead of the protector is connected with a coil terminal of the relay, and a third lead is connected with a coil tail end of the relay; the protector further comprises a grounding end and a switch element, and the switch element is connected between the third lead and the grounding end. The double-parallel starter comprises two starters and the protection relay, the protection relay is connected between the ignition switch and the switch terminal of the electromagnetic switch, and the second lead of the protector is connected with the motor terminal of the electromagnetic switch. When the judgment condition that the starter has the tooth jacking condition or is not engaged successfully is met, the electromagnetic switch is powered off by disconnecting the relay, the situation that the coil of the electromagnetic switch of the starter is ablated after being powered on for a long time is avoided, and the tooth jacking protection function, the delayed power-off function and the active engagement function are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to starter technology field, concretely relates to a protection relay and double parallel starter. BACKGROUND

[0002] For the engine of large displacement, if a single starter is used, it cannot output enough power to make the engine work normally. The common measure is to use parallel starters. When the parallel starters work, the load is shared, the loss caused by the overlarge load of a single starter is reduced, and large torque is outputted to improve the starting efficiency. The parallel starters can adapt to different starting requirements. In extreme working environments such as severe cold, multiple starters can provide additional power to ensure the smooth starting of the engine, provide sufficient starting power, and make the engine work normally.

[0003] The prior art double parallel starting circuit scheme directly connects two starters in parallel and connects two series-parallel battery groups. One of the starters is provided with an ignition switch between the starter and the battery group. The advantage of this scheme is that the wiring is simple and the investment cost is low. The disadvantage is that, due to the difference in response time of each starter, if one of the starters is engaged and the other is not engaged, the engaged starter may be damaged or the driving gear may be broken due to the large torque generated by the battery group. The unengaged starter may be unable to start the engine due to the current diversion of the engaged starter, resulting in the wear of the driving gear and the engine gear ring.

[0004] To solve the above problems, a parallel starting device for starting an internal combustion engine is proposed in the patent with the publication number ZL 201210134911.4. The device connects the electromagnetic switch contacts of two starters in series and connects the motor parts in parallel. The advantage of this patent scheme is that the parallel starters work simultaneously to output large torque to start the engine after the two starters are fully engaged with the engine gear ring, which can effectively avoid the gear tooth breaking and the gear ring milling caused by the single starter engaging and starting the engine. The disadvantage is that when the starter engages the gear tooth, the pull-in coil of the electromagnetic switch is connected to a large current for a long time, which may cause overheating and ablation of the coil, resulting in failure of the electromagnetic switch. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a protection relay and double parallel starter, which can effectively avoid the ablation failure of the electromagnetic switch coil caused by the gear tooth engagement or the too long power-on time of the double parallel starter, improve the probability of successful primary ignition engagement, increase safety, and protect related power-on equipment.

[0006] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0007] A protection relay is composed of a protector and a relay, the protector comprises a control circuit, a No.1 lead wire (61), a No.2 lead wire (62) and a No.3 lead wire (63) connected with the control circuit, the No.1 lead wire (61) is connected with the coil terminal of the relay, the No.3 lead wire (63) is connected with the coil end of the relay; the protector further comprises a grounding terminal and a switching element, the switching element is connected between the No.3 lead wire (63) and the grounding terminal, the control circuit controls the switching state of the switching element according to the voltage detected by the No.1 lead wire (61) and the No.2 lead wire (62) and the energizing time of the No.3 lead wire (63) to control the on-off of the relay.

[0008] Further, the relay is a terminal post type relay (7), the protector (6) comprises a housing (65), the grounding terminal of the protector (6) is connected with the housing (65) for grounding.

[0009] Further, the relay is a pin type relay (8), the protector (6) comprises a No.4 lead wire (64) for connecting with the negative pole of the battery pack (1), the No.4 lead wire (64) is connected with the grounding terminal of the protector (6).

[0010] Further, two pre-embedded lead wires are arranged in the support cover of the pin type relay (8), one end of a No.1 pre-embedded lead wire (82) is a positive pole pin (821), the other end of the No.1 pre-embedded lead wire (82) is a terminal (822) connected with the relay coil and the No.1 lead wire (61), one end of a No.2 pre-embedded lead wire (83) is a negative pole pin (831), the other end of the No.2 pre-embedded lead wire (83) is a terminal (832) connected with the No.4 lead wire (64).

[0011] Further, the protector (6) comprises a fixing lug (66) connected with both sides of the housing (65), the fixing lug (66) is provided with a fixing hole (67).

[0012] A double parallel starter comprises two starters (3, 4), the starter (3, 4) comprises an electromagnetic switch (31, 41) and a motor (32, 42), the two electromagnetic switches (31, 41) are connected in series with the positive pole of the battery pack (1), the two motors (32, 42) are connected in parallel with the motor terminal (313) of the terminal electromagnetic switch (31), the terminal of the pull-in coil (314, 414) of the electromagnetic switch (31, 41) is connected with the motor terminal (321, 421) of the corresponding motor (32, 42), further comprising the above-mentioned protection relay, the coil terminal of the protection relay is connected with the ignition switch (2), one static contact terminal of the protection relay is connected with the battery pack (1), the other static contact terminal is connected with the switching terminal (312, 412) of the electromagnetic switch (31, 41), the No.2 lead wire (62) of the protector is connected with the motor terminal (313, 413) of the electromagnetic switch (31, 41).

[0013] Further, the starter (3, 4) further comprises a No. 1 relay (30) and a No. 2 relay (40) respectively, the No. 1 relay (30) and the No. 2 relay (40) are connected in series between the positive pole of the battery group (1) and the switch terminal (312, 412) of the two electromagnetic switches (31, 41), and the coil terminal (301) of the No. 1 relay (30) and the coil terminal (401) of the No. 2 relay (40) are connected.

[0014] Further, the protection relay is provided with one and consists of a starting relay (5) and a protector (6), one static contact terminal (53a) of the starting relay (5) is connected with the battery terminal (411) of the No. 2 electromagnetic switch (41), the other static contact terminal (53b) is connected with the coil terminal (301) of the No. 1 relay (30) and the coil terminal (401) of the No. 2 relay (40), the protector (6) is provided with two No. 2 lead wires (62) and is connected with the motor terminal (313, 413) of the two electromagnetic switches (31, 41) respectively.

[0015] Further, the protection relay is provided with two, a No. 1 protector (601) and a No. 1 relay (30) and a No. 2 protector (602) and a No. 2 relay (40) respectively consist of the protection relay, the No. 2 lead wire (62) of the No. 1 protector (601) is connected with the motor terminal (313) of the No. 1 electromagnetic switch (31), and the No. 2 lead wire (62) of the No. 2 protector (602) is connected with the motor terminal (413) of the No. 2 electromagnetic switch (41).

[0016] After the above technical scheme is adopted, the beneficial effects of the utility model are:

[0017] Since the protection relay of the utility model is composed of a protector and a relay, the protector comprises a control circuit, a No. 1 lead wire, a No. 2 lead wire and a No. 3 lead wire connected with the control circuit, the No. 1 lead wire is connected with the coil terminal of the relay, and the No. 3 lead wire is connected with the coil terminal of the relay; the protector further comprises a grounding terminal and a switching element, the switching element is connected between the No. 3 lead wire and the grounding terminal, and the control circuit controls the switching state of the switching element according to the voltage detected by the No. 1 lead wire and the No. 2 lead wire and the power-on time of the No. 3 lead wire to control the on-off of the relay, the protection relay of the design can be used in the starter to control the on-off of the electromagnetic switch, and the protection function of the electromagnetic switch under different conditions can be realized, and the safety is enhanced.

[0018] The utility model discloses a double parallel starter, which comprises a protection relay, two electromagnetic switches and two motors.

[0019] In conclusion, the protection relay and the double parallel starter solve the technical problem of the existing technology that the electromagnetic switch's pull-in coil is easy to be ablated by long-time large current, the application can cut off the power supply of the electromagnetic switch when the starter appears the top tooth condition or the meshing is not successful, realize the top tooth protection and the delay power-off function, prevent the electromagnetic switch from ablation, increase the safety, and protect the power-on equipment; meanwhile, when the ignition switch is closed and the starter appears the top tooth condition, the protector can make the starter meshing actively for many times through the on-off control of the switch element, realize the ignition and starting once, and improve the meshing success rate of the starter. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic diagram of the first kind of implementation mode of the protection relay of the utility model;

[0021] Figure 2 It is the structure schematic diagram of the second kind of implementation mode of the protection relay of the utility model;

[0022] Figure 3 It is the structure schematic diagram of the relay; Figure 2

[0023] Figure 4 It is the structure schematic diagram of the protector;

[0024] Figure 5 It is the circuit structure schematic diagram of the first kind of embodiment of the double parallel starter with starting protection;

[0025] Figure 6 It is the circuit structure schematic diagram of the second kind of embodiment of the double parallel starter with starting protection of the utility model;

[0026] Figure 7 ​It is the third embodiment of the double-parallel starter with starting protection's circuit structure schematic diagram of the utility model.

[0027] In the drawing,

[0028] 1-battery group, 2-ignition switch,

[0029] 3-1st starter, 30-1st relay, 301-coil terminal, 302-relay coil, 304a, 304b-static contact terminal, 31-1st electromagnetic switch, 311-battery terminal, 312-switch terminal, 313-motor terminal, 314-pull-in coil, 32-1st motor, 321-motor terminal,

[0030] 4-2nd starter, 40-2nd relay, 401-coil terminal, 402-relay coil, 404a, 404b-static contact terminal, 41-2nd electromagnetic switch, 411-battery terminal, 412-switch terminal, 413-motor terminal, 414-pull-in coil, 42-2nd motor, 421-motor terminal,

[0031] 5-starting relay, 51-coil terminal, 52-relay coil, 53a, 53b-static contact terminal,

[0032] 6-protector, 601-1st protector, 602-2nd protector, 61-1st lead wire, 62-2nd lead wire, 63-3rd lead wire, 64-4th lead wire, 65-housing, 66-fixing lug, 67-fixing hole,

[0033] 7-post type relay, 71-bracket,

[0034] 8-pin type relay, 81-bracket, 821-1st pre-buried terminal, 821-positive pin, 822-terminal, 831-2nd pre-buried terminal, 831-negative pin, 832-terminal. DETAILED DESCRIPTION

[0035] The utility model is further explained below in combination with the drawings and embodiments, the preferred embodiment of the utility model is shown in the drawings, the function of the drawings is to supplement the description of the written part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0036] Example one:

[0037] As Figure 1As shown, this application protects a protective relay, which consists of a protector and a relay. The protector includes a control circuit and leads 1 (61), 2 (62), and 3 (63) connected to the control circuit. Lead 1 (61) is connected to the coil terminal of the relay, and lead 3 (63) is connected to the end of the relay coil. The protector also includes a grounding terminal and a switching element. The switching element is connected between lead 3 (63) and the grounding terminal. The control circuit controls the switching state of the switching element based on the voltage detected by leads 1 (61) and 2 (62) and the energizing time of lead 3 (63), thereby controlling the on / off state of the relay.

[0038] Specifically, the switching element can be a power switching transistor, and the control circuit controls the on / off state of the power switching transistor after processing the voltage input from lead 1 (61) and lead 2 (62). Alternatively, the switching element can be a relay switch, and the control circuit can include a microcontroller, which controls the on / off state of the relay switch after processing the voltage input from lead 1 (61) and lead 2 (62).

[0039] like Figure 1 As shown, the relay is a terminal block type relay 7, and the protector 6 includes a housing 65. The grounding terminal of the protector 6 is connected to the housing 65 for grounding. Lead 1 61 is connected to the terminal block at the relay coil terminal, lead 2 62 has a connecting piece at its end for connecting to motor terminals 313 and 413, and lead 3 63 is connected to the terminal block at the end of the relay coil.

[0040] like Figure 4 As shown, the protector 6 in this embodiment includes fixing ears 66 connected to both sides of the housing 65, and the fixing ears 66 have fixing holes 67. The protector 6 can be installed on a relay, starter motor, or vehicle via the fixing ears 66. The protector 6 with the above structure has high compatibility with relays, is simple to install, has high space utilization, does not affect the overall structural layout of the starter motor, and is convenient and flexible to use. In this application, it is preferred that the protector 6 be installed on the relay, and the protector 6 is installed in the clamping space of the relay bracket 71.

[0041] Example 2:

[0042] like Figure 2 As shown, this application protects another type of protective relay, which differs from Embodiment 1 in that the relay is a pin-type relay 8. Lead 1 61 is connected to the terminal block at the coil terminal of the pin-type relay 8. Lead 2 62 has a connecting piece at its end for connection to motor terminals 313 and 413. Lead 3 63 is connected to the terminal block at the end of the relay coil. A connector consisting of positive pin 821 and negative pin 831 is connected to the power connector of the battery pack 1. The protector 6 also includes lead 4 64 for connection to the negative terminal of the battery pack 1. One end of lead 4 64 is connected to the ground terminal of the protector 6, and the other end is connected to the negative pin 831.

[0043] As shown in Figure 3 , specifically, the support cover of the pin type relay 8 is provided with two pre-embedded terminal pieces, one end of the No. 1 pre-embedded terminal piece 82 is a positive pin 821, the other end of the terminal 822 is connected to the relay coil and connected to the No. 1 lead wire 61, and one end of the No. 2 pre-embedded terminal piece 83 is a negative pin 831, the other end of the terminal 832 is connected to the No. 4 lead wire 64.

[0044] Example three:

[0045] As shown in Figure 5 , the application also protects a double-parallel starter, the main circuit includes two starters 3, 4, the starter includes an electromagnetic switch and a motor, the two electromagnetic switches are connected in series at the positive electrode of the battery group 1, the two motors are connected in parallel at the motor terminal of the end electromagnetic switch, and the pull-in coil of the electromagnetic switch is connected to the motor terminal of the corresponding motor. The two starters are No. 1 starter 3 and No. 2 starter 4, and the electromagnetic switch and the motor are respectively No. 1 electromagnetic switch 31, No. 1 motor 32 and No. 2 electromagnetic switch 41, No. 2 motor 42. The application also includes the protection relay of example one, the coil terminal of the protection relay is connected to the ignition switch 2, one of the static contact terminals of the protection relay is connected to the battery group 1, and the other static contact terminal is connected to the switch terminal 312, 412 of the electromagnetic switch 31, 41, and the No. 2 lead wire 62 of the protector is connected to the motor terminal 313, 413 of the electromagnetic switch 31, 41.

[0046] The above-mentioned starter main circuit is specifically connected as follows: the battery group 1 is first connected to the battery terminal 411 of the No. 2 electromagnetic switch 41 through a wire, the motor terminal 413 of the No. 2 electromagnetic switch 41 is connected to the battery terminal 311 of the No. 1 electromagnetic switch 31 through a wire, when the two starter contacts are closed, the No. 1 electromagnetic switch 31 and the No. 2 electromagnetic switch 41 are connected in series. The motor terminal 313 of the No. 1 electromagnetic switch 31 is connected to the motor terminal 321 of the No. 1 motor 32 through a wire, and the other end is connected to the motor terminal 421 of the No. 2 motor 42, realizing the parallel connection of the No. 1 motor 32 and the No. 2 motor 42. The pull-in coil 314 of the No. 1 electromagnetic switch 31 is connected to the terminal of the No. 1 motor 32, and the pull-in coil 414 of the No. 2 electromagnetic switch 41 is connected to the terminal of the No. 2 motor 42. In this way, when the two starters can normally engage, their response time will be consistent.

[0047] The electromagnetic switch of the embodiment is connected with a relay between the ignition switch 2, the relay includes a No. 1 relay 30 and a No. 2 relay 40 belonging to the No. 1 starter 3 and the No. 2 starter 4 respectively, the No. 1 relay 30 and the No. 2 relay 40 are connected in series between the positive pole of the storage battery set 1 and the switch terminals of the two electromagnetic switches respectively, and the coil terminals 301 of the No. 1 relay 30 and the coil terminals 401 of the No. 2 relay 40 are connected. The specific connection is that one static contact terminal 304a, 404a of the No. 1 relay 30 and the No. 2 relay 40 is connected with one static contact terminal of the No. 2 electromagnetic switch 41, the other static contact terminal 304b of the No. 1 relay 30 is connected with the switch terminal 312 of the No. 1 electromagnetic switch 31, and the other static contact terminal 404b of the No. 2 relay 40 is connected with the switch terminal 412 of the No. 2 electromagnetic switch 41. By controlling whether the coil terminals 301 of the No. 1 relay 30 and the coil terminals 401 of the No. 2 relay 40 are powered, the power supply of the switch terminals 312, 412 of the No. 1 electromagnetic switch 31 and the No. 2 electromagnetic switch 41 can be controlled.

[0048] In the embodiment, the protection relay is provided with one and consists of a starting relay 5 and a protector 6, one static contact terminal 53a of the starting relay 5 is connected with the battery terminal 411 of the No. 2 electromagnetic switch 41, the other static contact terminal 53b is connected with the coil terminals 301 of the No. 1 relay 30 and the coil terminals 401 of the No. 2 relay 40, and the protector 6 is provided with two No. 2 lead wires 62 and is connected with the motor terminals 313, 413 of the two electromagnetic switches 31, 41 respectively. When the voltage of the coil terminal 51 of the starting relay 5 and the motor terminals 313, 413 of the electromagnetic switches 31, 41 does not meet the determination condition or the energization time of the relay coil 52 exceeds the set value, it is judged that the starter appears the top tooth condition or does not engage successfully, at this time, the No. 3 lead wire 63 is disconnected with the ground terminal, the relay is powered off, and then the electromagnetic switch is powered off, so as to realize the protection function.

[0049] In the embodiment, by externally arranging the protector 6 and the starting relay 5, the detection control of the No. 1 relay 30 and the No. 2 relay 40 of the two starters can be realized, the power consumption of the drive circuit can be reduced, the control logic can be simplified, the control can be more centralized and unified, the synchronization of the operation can be ensured, and the installation structure of the double-parallel starters is not affected.

[0050] The protection function is described below by taking that the protector 6 is arranged in the starting relay 5 as an example:

[0051] The voltage of the coil terminal 51 of the starting relay 5 and the voltage of the motor terminal 313, 413 detected by the No. 1 lead wire 61 and the No. 2 lead wire 62 of the protector 6 can determine whether the starter is in the tooth engagement state during starting. First, it is necessary to ensure that the ignition switch 2 is closed, that is, the voltage of the motor terminal 313 or 413 of one of the starters is greater than a set value U1, that is, the electromagnetic switch 31 or 41 is in the energized state, and the set value U1 can be 0.5 V; second, when the starter is in the tooth engagement state, the situation that the yoke is not completely punched and the electromagnetic switch contact is not closed occurs, so when the voltage drop value of the coil terminal 51 of the starting relay 5 and the voltage at the motor terminal 313, 413 is greater than a set value U2, that is, the tooth engagement phenomenon occurs. The determination condition of the tooth engagement phenomenon is that the voltage of the motor terminal 313, 413 is greater than the set value U1 and the voltage drop value of the coil terminal 51 of the starting relay 5 and the voltage at the motor terminal 313, 413 is greater than the set value U2, at this time, the control circuit in the protector 6 controls the switching element to be disconnected, so that the starting relay 5 is de-energized, and then the two electromagnetic switches 31, 41 are simultaneously de-energized, the double-parallel starter drive gear is returned, and the tooth engagement protection function is realized.

[0052] The starter of the present application also has an active engagement function. In practical application, the protector 6 detects the tooth engagement state after T1 time of energization, T1 can be 0.4-0.6 s, when the tooth engagement state occurs, the starting relay 5 has no current output, the No. 1 relay 30 and the No. 2 relay 40 control the No. 1 electromagnetic switch 31 and the No. 2 electromagnetic switch 41 to be de-energized; after a certain time T2 of de-energization, the current in the coil of the starting relay 5 is controlled to pass through again, the contacts of the No. 1 relay 30 and the No. 2 relay 40 are closed, and the two electromagnetic switches 31, 41 are energized; after T3 time of energization, whether the tooth engagement state occurs is determined again according to the above determination condition, if it occurs, the process of de-energizing, energizing, detecting and determining of the starting relay 5 is continued, if it does not occur, the current in the coil of the starting relay 5 continues to pass through, and the starter works normally. Secondly, if the starter is in the tooth engagement state, the protector 6 controls the relay to be de-energized for more than twice, the protector 6 controls the relay to be de-energized, so that the relay is not actively engaged, and the starter is de-energized. In this way, under the condition that the ignition switch 2 is closed and the starter is in the tooth engagement state, the engagement can be carried out for many times, the starting is realized once the ignition is turned on, and the engagement success rate of the starter is improved. When the engagement times of the starter reach the specified period times, the protector 6 de-energizes the relay, and the ignition switch 2 needs to be closed again for re-starting.

[0053] The starter of the present application also has a delay de-energization function. When the protector 6 connects the relay, the relay is energized for a long time, exceeds the specified time such as 30 s, the relay is de-energized, and the starter is de-energized and not started. Therefore, when the protection relay is energized for a long time, the protector 6 de-energizes the relay, and the ignition switch 2 needs to be closed again for re-starting.

[0054] In this embodiment, the control circuit in the protector 6 can be a single-chip microcomputer, and the comparison and analysis of data and the output of corresponding signals are realized by the program written in the single-chip microcomputer in advance, so as to realize the top tooth protection, the delay power-off protection and the active engagement function of the protector 6.

[0055] Embodiment Four

[0056] As shown in Figure 6 the present application also protects another double-parallel starter, which is different from the embodiment three in that the protector 6 is provided with two, which are respectively named as the No. 1 protector 601 and the No. 2 protector 602, and the No. 1 protector 601 and the No. 1 relay 30 and the No. 2 protector 602 and the No. 2 relay 40 respectively form a protection relay, which is still the protection relay of the terminal block type in the embodiment one.

[0057] The specific wiring is that the No. 1 lead 61 of the No. 1 protector 601 is connected with the coil terminal 301 of the No. 1 relay 30, the No. 2 lead 62 is connected with the motor terminal 313 of the No. 1 electromagnetic switch 31, and the No. 3 lead 63 is connected with the coil end of the No. 1 relay 30; the No. 1 lead 61 of the No. 2 protector 602 is connected with the coil terminal 401 of the No. 2 relay 40, the No. 2 lead 62 is connected with the motor terminal 413 of the No. 2 electromagnetic switch 41, and the No. 3 lead 63 is connected with the coil end of the No. 2 relay 40. In this way, the two protectors work in parallel, respond faster and execute the protection action after detecting the fault, and the system reliability is improved.

[0058] Embodiment Five

[0059] As shown in Figure 7 the present application also protects another double-parallel starter, which is different from the embodiment three in that the protector 6 is provided with two, which are respectively named as the No. 1 protector 601 and the No. 2 protector 602, and the No. 1 protector 601 and the No. 1 relay 30 and the No. 2 protector 602 and the No. 2 relay 40 respectively form a protection relay, which is still the protection relay of the terminal block type in the embodiment one.

[0060] Embodiment Four

[0061] the present application also protects another double-parallel starter, which is different from the embodiment three in that the protector 6 is provided with two, which are respectively named as the No. 1 protector 601 and the No. 2 protector 602, and the No. 1 protector 601 and the No. 1 relay 30 and the No. 2 protector 602 and the No. 2 relay 40 respectively form a protection relay, which is still the protection relay of the terminal block type in the embodiment one.

[0062] The protective relay and the double-parallel starter of the utility model protect the voltage at the coil terminal of the relay and the motor terminal of the electromagnetic switch through setting the switching element in the protector, judge that the starter appears the top tooth condition or does not mesh successfully when the voltage at two places does not satisfy the determination condition or the electrifying time exceeds the set value, make the relay coil power off through disconnecting the switching element, and then make the electromagnetic switch power off, thereby avoiding the electromagnetic switch coil electrifying for a long time, preventing the electromagnetic switch from ablation, increasing the safety, and protecting the electrifying equipment.

[0063] In the description of the present specification, unless otherwise explicitly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, and the skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0064] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that the described embodiments are only part of the embodiments of the utility model, not all the embodiments, these are only examples, and the protection scope of the utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, without any creative labor, but these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A protective relay, characterized in that The protector comprises a control circuit, a No. 1 lead wire (61), a No. 2 lead wire (62) and a No. 3 lead wire (63) connected with the control circuit, the No. 1 lead wire (61) is connected with the coil terminal of the relay, and the No. 3 lead wire (63) is connected with the coil end of the relay; The protector further comprises a grounding terminal and a switching element, the switching element is connected between the No. 3 lead wire (63) and the grounding terminal, and the control circuit controls the switching state of the switching element according to the voltage detected by the No. 1 lead wire (61) and the No. 2 lead wire (62) and the energization time of the No. 3 lead wire (63) to control the on-off of the relay.

2. The protective relay according to claim 1, characterized in that The relay is a post-type relay (7), and the grounding terminal of the protector (6) is connected with the shell (65) to be grounded.

3. The protective relay according to claim 1, characterized in that The relay is a pin-type relay (8), and the protector (6) comprises a No. 4 lead wire (64) for being connected with the negative pole of the battery pack (1), and the No. 4 lead wire (64) is connected with the grounding terminal of the protector (6).

4. The protective relay according to claim 3, characterized in that The support cover of the pin-type relay (8) is provided with two pre-buried lead wires, one end of a No. 1 pre-buried lead wire (82) is a positive pole pin (821), the other end of the No. 1 pre-buried lead wire (82) is a terminal (822) connected with the relay coil and connected with the No. 1 lead wire (61), one end of a No. 2 pre-buried lead wire (83) is a negative pole pin (831), and the other end of the No. 2 pre-buried lead wire (83) is a terminal (832) connected with the No. 4 lead wire (64).

5. The protective relay of claim 1, wherein, The protector (6) comprises a fixing lug (66) connected with both sides of the shell (65), and the fixing lug (66) is provided with a fixing hole (67).

6. A dual parallel starter comprising two starters (3, 4), the starter (3, 4) comprising an electromagnetic switch (31, 41) and an electric motor (32, 42), the two electromagnetic switches (31, 41) being connected in series to the positive terminal of a battery (1), the two electric motors (32, 42) being connected in parallel to the motor terminal (313) of the terminal electromagnetic switch (31), the terminal of the pull-in coil (314, 414) of the electromagnetic switch (31, 41) being connected to the motor terminal (321, 421) of the corresponding electric motor (32, 42), characterized in that, The application further comprises the protection relay according to any one of claims 1 to 5, the coil terminal of the protection relay is connected with the ignition switch (2), one static contact terminal of the protection relay is connected with the battery pack (1), and the other static contact terminal is connected with the switching terminal (312, 412) of the electromagnetic switch (31, 41), and the No. 2 lead wire (62) of the protector is connected with the motor terminal (313, 413) of the electromagnetic switch (31, 41).

7. The dual parallel starter of claim 6, wherein, The starter (3, 4) further comprises a No. 1 relay (30) and a No. 2 relay (40), respectively, the No. 1 relay (30) and the No. 2 relay (40) are connected in series between the positive pole of the battery pack (1) and the switching terminal (312, 412) of the two electromagnetic switches (31, 41), and the coil terminal (301) of the No. 1 relay (30) and the coil terminal (401) of the No. 2 relay (40) are connected.

8. The dual parallel starter of claim 7, wherein, The protection relay is provided with one and comprises a starting relay (5) and a protector (6), one static contact terminal (53a) of the starting relay (5) is connected with the battery terminal (411) of the No. 2 electromagnetic switch (41), the other static contact terminal (53b) is connected with the coil terminal (301) of the No. 1 relay (30) and the coil terminal (401) of the No. 2 relay (40), and the protector (6) is provided with two No. 2 lead wires (62) and connected with the motor terminal (313, 413) of the two electromagnetic switches (31, 41), respectively.

9. The dual parallel starter of claim 7, wherein, The protection relay is provided with two, No. 1 protector (601) and No. 1 relay (30) and No. 2 protector (602) and No. 2 relay (40) respectively constitute protection relay, No. 1 protector (601) 2 lead (62) and No. 1 electromagnetic switch (31) motor terminal (313) is connected, No. 2 protector (602) 2 lead (62) and No. 2 electromagnetic switch (41) motor terminal (413) is connected.

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