Frequency conversion board aging test device with high safety

Abstract

The utility model discloses a frequency conversion board aging test device with high safety. The frequency conversion board aging test device comprises a test cabinet and a load cabinet, the test cabinet can form an environment meeting aging test conditions, and comprises a plurality of first accommodating cavities which are used for placing frequency conversion plates respectively and electrifying the frequency conversion plates to enable the frequency conversion plates to output driving voltage for driving a compressor to operate; the load cabinet comprises a plurality of second accommodating cavities, a plurality of selection switches and a plurality of compressors; the compressors are of at least two types and are suitable for the frequency conversion plates of different types. The compressors of different models are arranged in the same second containing cavity. The selection switch comprises an input end and at least two output ends; the output ends are respectively connected with the compressors of various models; the input end is connected with the test cabinet and is used for receiving the driving voltage; and the selection switch can select one of the output ends to be communicated with the input end. According to the utility model, the safety and efficiency of model switching are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to variable frequency drive board test technical field, specifically, relate to a kind of safety high variable frequency board aging test device. BACKGROUND

[0002] With the improvement of living standards, air conditioning and refrigerator and other refrigeration equipment has become many families indispensable household appliances. Variable frequency refrigeration equipment gradually becomes the first choice of consumers due to low energy consumption, better refrigeration effect. The core component of variable frequency refrigeration equipment is variable frequency drive board, which controls the operation of compressor;Therefore, the stability and reliability of variable frequency board determine the stability and reliability of variable frequency equipment.

[0003] At present, the stability and reliability of variable frequency board are tested by aging test;And aging test is not tested by assembling it into refrigeration equipment, but by designing aging test device including test cabinet and load cabinet, to reduce cost and improve test efficiency.

[0004] However, the existing load cabinet is equipped with multiple compressors suitable for one type of variable frequency board;When another type of variable frequency board needs to be changed to aging test, the compressors in the load cabinet need to be disassembled, and the compressor load suitable for variable frequency board needs to be loaded into the load cabinet, which is easy to cause safety accidents and reduce the efficiency of production change.

[0005] The above information disclosed in the background art is only used to increase the understanding of the background art of the present application, and therefore, it can include prior art known by those skilled in the art. SUMMARY

[0006] The utility model discloses variable frequency board aging test device's load cabinet change production safety is poor and the problem of low efficiency in prior art, propose a kind of safety high variable frequency board aging test device, improve the safety and efficiency of production change.

[0007] To achieve the above utility model purposes, the utility model adopts the following technical solutions to be realized:

[0008] A kind of safety high variable frequency board aging test device, including test cabinet, load cabinet;

[0009] The test cabinet can form an environment that meets the conditions of aging test, including a plurality of first cavities, for placing variable frequency boards respectively, and powering each variable frequency board to output drive voltage for driving compressor operation;

[0010] The load cabinet comprises a plurality of second cavities, a plurality of selection switches and a plurality of compressors; the compressors are of at least two types and are suitable for different types of the frequency conversion board respectively; one of the compressors of each type is arranged in the same second cavity; the selection switch comprises an input end and at least two output ends; each output end is connected with the compressors of each type respectively; the input end is connected with the test cabinet and is used for receiving the driving voltage; the selection switch can select one of the output ends to be communicated with the input end.

[0011] The frequency conversion board aging test device of the utility model can select one of the compressors of each type to be communicated with the test cabinet through the selection switch, and the selected compressor is used as the load of the frequency conversion board in the test cabinet, so that one of the conditions for the aging test of the frequency conversion board is formed.

[0012] In some specific embodiments, the load cabinet further comprises a manual control switch.

[0013] The selection switch is a double-throw relay, which comprises a control coil, a first contact group, a second contact group and a third contact group; the control coil is connected with the low-voltage power supply in series after being connected with the manual control switch; the first contact group, the second contact group and the third contact group each comprise a plurality of contacts; the first contact group is communicated with the second contact group when the control coil is powered on and is communicated with the third contact group when the control coil is powered off.

[0014] The compressors comprise two types; each contact of the second contact group is connected with the compressor of one type; each contact of the third contact group is connected with the compressor of the other type.

[0015] The frequency conversion board aging test device of the embodiment can realize the rapid change of production and improve the change efficiency of production by controlling the test cabinet to be communicated with the compressors of one type in each second cavity through the double-throw relay.

[0016] A frequency conversion board aging test device with high safety, comprising a test cabinet and a load cabinet.

[0017] The test cabinet can form an environment meeting the conditions of the aging test, and comprises a plurality of first cavities for placing the frequency conversion boards respectively and supplying power to each frequency conversion board to output a driving voltage for driving the compressors to operate;

[0018] The load cabinet comprises a plurality of second cavities, a plurality of controllable switches and a plurality of compressors; the compressors are of at least two types and are suitable for different types of the frequency conversion board; one of the compressors of each type is arranged in the same second cavity; each controllable switch is arranged corresponding to each compressor and is connected with the compressors of each type and the test cabinet, and is used for controlling the compressor of one type in the second cavity to receive the driving voltage.

[0019] The frequency conversion board aging test device of the utility model sets up a plurality of types of compressors in the load cabinet, and selects one type of compressor in communication with the test cabinet through the controllable switch, and uses the compressor as the load of the frequency conversion board in the test cabinet, and forms one of the conditions of the frequency conversion board aging test. When the frequency conversion board of the type is replaced, the compressor of the replaced frequency conversion board is quickly switched in communication with the test cabinet through the control of the controllable switch, which not only avoids the safety problem of disassembling and replacing the compressor, improves the safety, but also improves the switching efficiency.

[0020] In some specific embodiments, the compressors comprise two types; the controllable switches in the second cavities are first relays and second relays respectively; the first relay comprises a first control coil and a first switch group; the second relay comprises a second control coil and a second switch group;

[0021] The load cabinet further comprises manual control switches connected with the first control coil and the second control coil respectively, so as to make the first control coil or the second control coil in communication with the low-voltage power supply;

[0022] The first switch group is connected with the compressors of one type and the test cabinet respectively; and the second switch group is connected with the compressors of another type and the test cabinet respectively.

[0023] The frequency conversion board aging test device of the embodiment realizes the rapid production change of the aging test by controlling the test cabinet in communication with one type of compressor in each second cavity through the single-through relay, and improves the production change efficiency.

[0024] In some specific embodiments, the first relay further comprises a third switch; and the second relay further comprises a fourth switch;

[0025] The fourth switch is a normally closed contact switch and is connected in series with the first control coil; and the third switch is a normally closed contact switch and is connected in series with the second control coil.

[0026] The frequency conversion board aging test device of the embodiment realizes that only one type of compressor in each second cavity is in communication with the test cabinet through the interlocking circuit of the relay, and improves the safety of the frequency conversion board aging test.

[0027] In some specific embodiments, the first relay further comprises a fifth switch; the second relay further comprises a sixth switch;

[0028] The load cabinet further comprises a plurality of indicator lights, which are respectively arranged corresponding to each of the compressors in each of the second cavities, are respectively connected in series with the corresponding fifth switch and sixth switch, and are connected with the low-voltage power supply.

[0029] The variable frequency board aging test device of the embodiment improves the reliability and accuracy of the connection by connecting the low-voltage power supply through the fifth switch and the sixth switch of the first relay and the second relay and testing the voltage of the end not connected to the low-voltage power supply to know whether the corresponding compressor is connected. The confirmation efficiency is improved by setting the indicator light to improve the visualization of the connection of the corresponding compressor.

[0030] In some specific embodiments, the indicator light comprises two colors, which correspond to each type of the compressor in the second cavity.

[0031] The variable frequency board aging test device of the embodiment improves the identification efficiency and the identification efficiency of whether the corresponding compressor is connected by setting the indicator light of the corresponding color corresponding to the compressor of different types.

[0032] In some specific embodiments, the load cabinet is a square box body, which is provided with multiple layers; the plurality of second cavities are arranged in sequence along the length direction of each layer.

[0033] The variable frequency board aging test device of the embodiment improves the volume of the load cabinet and reduces the occupied space.

[0034] In some specific embodiments, the load cabinet further comprises a plurality of fans;

[0035] Each of the second cavities is arranged left and right adjacent to each other, and the second cavities are connected in front and back; an opening is arranged in front and back of the second cavity; the fan is fixedly arranged on the opening, and the wind direction is the same.

[0036] The variable frequency board aging test device of the embodiment improves the heat dissipation efficiency of the second cavity and improves the reliability of the operation of the compressor.

[0037] In some specific embodiments, the load cabinet further comprises a mounting rack, which is a square rack body, is arranged longitudinally, is located at one end of the length direction of the load cabinet, and comprises an outer frame and a plurality of cross beams arranged in the outer frame in a transverse direction.

[0038] A plurality of long through holes are formed on the cross beam along the length direction of the cross beam, which are used for mounting each of the first relays and each of the second relays.

[0039] Other features and advantages of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the application. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, hereinafter, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0041] Figure 1 is a structural schematic view of a load cabinet according to an embodiment;

[0042] Figure 2 is a structural schematic view of a mounting frame according to an embodiment;

[0043] Figure 3 is a circuit connection schematic view according to an embodiment;

[0044] Figure 4 is a circuit connection schematic view according to an embodiment;

[0045] Figure 5 is a circuit connection schematic view according to an embodiment;

[0046] Figure 6 is a circuit connection schematic view according to an embodiment;

[0047] Figure 7 is a circuit connection schematic view according to an embodiment.

[0048] In the drawings,

[0049] 1, load cabinet; 11, second cavity; 12, compressor; 13, mounting frame; 131, outer frame; 132, cross beam; 133, auxiliary beam; 14, layer; 15, fan;

[0050] KM, control coil; 11 / 21 / 41, first contact group; 12 / 22 / 42, second contact group; 14 / 24 / 44, third contact group; KM1, first control coil; KA1, first switch group; K31, third switch; K51, fifth switch; KM2, second control coil; KA2, second switch group; K42, fourth switch; K62, sixth switch; L1, first indicator lamp; L2, second indicator lamp; 134, long through hole. DETAILED DESCRIPTION

[0051] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0052] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the present application.

[0053] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the embodiments, the specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features.

[0055] In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0056] Referring to Figure 1 The utility model discloses a kind of high safety variable frequency board aging test devices, including test cabinet, load cabinet 1.

[0057] Test cabinet includes test box, and the environment of composite aging test condition is formed in test box;Formed by multiple first cavities in test box, for respectively placing variable frequency board, and for each variable frequency board energization makes its output drive voltage for driving compressor 12 operation;Short circuit between each variable frequency board is avoided by the isolation of each first cavity, guarantee the safety and reliability of each variable frequency board aging test.

[0058] The load cabinet 1 has a square, three-dimensional structure, forming multiple second cavities 11 for housing compressors 12. The load cabinet 1 also includes multiple selector switches and multiple compressors 12, with at least two different models of compressors 12. Each model of compressor 12 is adapted to the testing of different models of inverter boards. One compressor 12 of each different model is housed within the same second cavity 11. This improves the systematic installation of the compressors 12 and reduces installation difficulty.

[0059] The selector switch includes an input terminal and at least two output terminals; the input terminal is connected to the test cabinet to receive the drive voltage; each output terminal is connected to a compressor 12 of a different model; the selector switch can select one of the output terminals to connect to the input terminal, so that one of the compressors 12 of a different model in each second cavity 11 is connected to the test cabinet and operates as the load of the frequency converter board in the test cabinet.

[0060] This utility model's inverter board aging test device uses multiple compressors 12 of various models installed in the load cabinet 1. A selector switch allows for the selection of one compressor 12 model to connect to the test cabinet, serving as the load for the inverter board within the test cabinet and forming one of the conditions for inverter board aging tests. When changing the inverter board model for aging testing, the selector switch can quickly switch the compressor 12 suitable for the new inverter board to connect to the test cabinet. This not only avoids the safety issues associated with disassembling and replacing the compressor 12, improving safety, but also increases switching efficiency.

[0061] The specific structure and principle of the edge patch aging test device of this utility model will be described in detail below through specific embodiments.

[0062] In some specific embodiments, refer to Figure 1 , Figure 3 The load cabinet 1 also includes a manual control switch, which is a two-position switch with both connected and disconnected states.

[0063] The selection switch is a double-pass relay, which comprises a control coil KM, a first contact group 11 / 21 / 41, a second contact group 12 / 22 / 42, and a third contact group 14 / 24 / 44; the first contact group 11 / 21 / 41, the second contact group 12 / 22 / 42, and the third contact group 14 / 24 / 44 each comprise a plurality of contacts, the contacts of the first contact group 11 / 21 / 41 are respectively connected with the frequency conversion board outputs of the test cabinet; the contacts of the second contact group 12 / 22 / 42 are respectively connected with a compressor 12 of one model in the second cavity 11; the contacts of the third contact group 14 / 24 / 44 are respectively connected with a compressor 12 of another model in the second cavity 11; and the contacts of the first contact group 11 / 21 / 41 are respectively communicated with the contacts of the second contact group 12 / 22 / 42 or the contacts of the third contact group 14 / 24 / 44, which are controlled by the power-on or power-off of the control coil KM.

[0064] The manual control switch is connected with the low-voltage power supply in series with the control coil KM, and the power-on and power-off of the control coil KM are controlled through the manual control switch.

[0065] The frequency conversion board aging test device of the embodiment controls the test cabinet to be communicated with a compressor 12 of one model in each second cavity 11 through the double-pass relay, so that the production change of the aging test is realized quickly, and the production change efficiency is improved.

[0066] Of course, the control coil KM can also be connected or disconnected with the low-voltage power supply through the controller control switch element.

[0067] Referring to Figure 1 , Figure 4 The utility model discloses a kind of high safety frequency conversion board aging test devices, which includes test cabinet, load cabinet 1.

[0068] Test cabinet includes test box, and the environment of composite aging test condition is formed in test box;Formed by multiple first cavities in test box, for placing frequency conversion board respectively, and for each frequency conversion board power-on to make its output drive voltage for driving compressor 12 operation;Short circuit between each frequency conversion board is avoided by the isolation of each first cavity, guarantee the safety and reliability of each frequency conversion board aging test.

[0069] Load cabinet 1 is square three-dimensional structure, forms by multiple second cavities 11, for placing compressor 12;Load cabinet 1 further includes multiple controllable switches and multiple compressors 12, and compressor 12 is at least two models;Compressor 12 of each model is adapted to the test of different model frequency conversion board. One compressor 12 of each different model is arranged in the same second cavity 11. Improve the orderliness of compressor 12 installation, reduce installation difficulty.

[0070] Each controllable switch is configured for each compressor 12, including an input terminal and an output terminal; the input terminal is connected to the test cabinet to receive the drive voltage; the output terminal is connected to the compressor 12; the controllable switch can control the connection and disconnection of each compressor 12 with the test cabinet, and select the appropriate compressor 12 to be connected so that it can operate as the load of the frequency converter board in the test cabinet.

[0071] This utility model's inverter board aging test device incorporates multiple compressors 12 of various models within a load cabinet 1. A controllable switch allows for the selection of one compressor 12 model to connect to the test cabinet, serving as the load for the inverter board within the cabinet and creating one of the conditions for inverter board aging tests. When changing the inverter board model for aging testing, the controllable switch can quickly switch the connection between the compressor 12 suitable for the new inverter board and the test cabinet. This not only avoids the safety issues associated with disassembling and replacing the compressor 12, improving safety, but also increases switching efficiency.

[0072] The specific structure and principle of the frequency converter board aging test device of this utility model will be described in detail below through specific embodiments.

[0073] In some specific embodiments, refer to Figure 1 , Figure 4 The compressor 12 includes two types of signals; that is, two types of compressors 12 are fixedly placed in the second cavity 11.

[0074] For each of the two models of compressors 12 corresponding to the second cavity 11, a first relay and a second relay are respectively provided; the first relay includes a first control coil KM1 and a first switch group KA1; the second relay includes a second control coil KM2 and a second switch group KA2; the first switch group KA1 consists of multiple two-position switches, each of which is connected to one model of compressor 12 and the test cabinet; the second switch group KA2 consists of multiple two-position switches, each of which is connected to another model of compressor 12 and the test cabinet.

[0075] The load cabinet 1 also includes a manual control switch, which is connected to the first control coil KM1 and the second control coil KM2 respectively, so that each of the first control coil KM1 or each of the second control coil KM2 can be connected to the low voltage power supply.

[0076] In this embodiment, the inverter board aging test device connects the test cabinet to one of the compressor models 12 in each of the second cavities 11 via a single-pass relay, enabling rapid production changeover for the aging test and improving production changeover efficiency.

[0077] Of course, each of the first control coils KM1 and each of the second control coils KM2 can also be connected or disconnected from the low-voltage power supply by controlling the switching elements through the controller.

[0078] In some specific embodiments, with reference to Figure 1 , Figure 5 , the first relay further comprises a third switch K31; the second relay further comprises a sixth switch K62; the sixth switch K62 is connected in series with the sixth switch K62 and the K42; the sixth switch K62 is a normally closed contact switch controlled by the second control coil KM2; the third switch K31 is a normally closed contact switch controlled by the first control coil KM1.

[0079] That is, when the first control coil KM1 controls the first switch group KA1 to be closed, the second control coil KM2 controls the second switch group KA2 to be opened, the third switch K31 is opened, and the sixth switch K62 is connected, so that the interlocking of the communication and disconnection of each type of compressor 12 in each second cavity 11 and the test cabinet is formed, and it is ensured that only one type of compressor 12 is connected to the test cabinet.

[0080] The frequency conversion board aging test device of the embodiment realizes that only one type of compressor 12 in each second cavity 11 is connected to the test cabinet through the interlocking circuit of the relay, and the safety of the frequency conversion board aging test is improved.

[0081] In some specific embodiments, with reference to Figure 1 , Figure 6 , the first relay further comprises a fifth switch K51; the second relay further comprises a sixth switch; the fifth switch K51 and the sixth switch are normally open contacts of the first relay and the second relay, respectively, and are controlled by the first control coil KM1 and the second control coil KM2, respectively.

[0082] The fifth switch K51 and the sixth switch are connected to the low-voltage power supply, and when the corresponding type of compressor 12 is connected to the test cabinet, the end of the corresponding fifth switch K51 or sixth switch that is not connected to the low-voltage power supply is connected to the low-voltage power supply, and the voltage thereof is detected to confirm whether the corresponding compressor 12 is connected to the test cabinet.

[0083] The frequency conversion board aging test device of the embodiment connects the fifth switch K51 and the second switch of the first relay and the second relay to the low-voltage power supply and detects the voltage of the end not connected to the low-voltage power supply to determine whether the corresponding compressor 12 is connected, thereby improving the reliability and accuracy of the connection confirmation.

[0084] In some specific embodiments, with reference to Figure 1 , Figure 7 , the load cabinet 1 further comprises a plurality of indicator lights, which are respectively arranged corresponding to each compressor 12 in each second cavity 11 and are connected in series with the corresponding fifth switch K51 and sixth switch, so that when the fifth switch K51 or the sixth switch is connected, the corresponding indicator light is on.

[0085] The frequency conversion board aging test device of the embodiment improves the visuality of the connection of the corresponding compressor 12 by setting the indicator light, and improves the confirmation efficiency.

[0086] In some specific embodiments, referring to Figure 1 , Figure 7 Each indicator light includes two colors, i.e., the first indicator light L1 and the second indicator light L2, corresponding to each type of compressor 12 in the second cavity 11. That is, when a type of compressor 12 is connected to the test cabinet, the indicator light of the corresponding color is on.

[0087] The frequency conversion board aging test device of the embodiment improves the visuality of the connection of the corresponding compressor 12 by setting the indicator light of the corresponding color corresponding to different types of compressors 12, and improves the identification efficiency of whether the corresponding compressor 12 is connected.

[0088] In some specific embodiments, referring to Figure 1 , Figure 2 The load cabinet 1 is a square box body, and is provided with multiple layers 14; multiple second cavities 11 are sequentially arranged along the length direction of each layer 14; the volume of the load cabinet 1 is improved and the occupied space is reduced.

[0089] In some specific embodiments, referring to Figure 1 , Figure 2 The load cabinet 1 further includes multiple fans 15, which are arranged corresponding to each second cavity 11; each second cavity 11 is connected in front and back; an opening is arranged in front and back of each second cavity 11; the fan 15 is fixedly arranged on each opening, and the air directions are the same, so that the front and back corresponding air flow of each second cavity 11 is realized, and the compressors 12 are cooled.

[0090] In some specific embodiments, referring to Figure 1 , Figure 2 The number of second cavities 11 in the front and back directions of the load cabinet 1 is one; and each type of compressor 12 is arranged in the second cavity 11 in a transverse direction.

[0091] In some specific embodiments, referring to Figure 1 , Figure 2 The load cabinet 1 further includes a mounting frame 13, which is a square frame body and is arranged in a longitudinal direction, located at one end of the length direction of the load cabinet 1, and includes an outer frame 131 and multiple cross beams 132 arranged in the outer frame 131 in a transverse direction.

[0092] Multiple long through holes 134 are formed on the cross beam 132 along the length direction of the cross beam 132, which are connected in front and back, and are used for mounting each first relay and each second relay.

[0093] In some specific embodiments, referring to Figure 1 , Figure 2The mounting rack 13 further comprises a plurality of auxiliary beams 133 which are arranged in the outer frame 131 and are arranged transversely and in parallel, so as to improve the strength of the mounting rack 13.

[0094] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can still be modified by those of ordinary skill in the art, or some of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.

Claims

1. A high-safety variable frequency board aging test device, characterized in that, The application relates to a test cabinet and a load cabinet. The test cabinet can form an environment meeting the conditions of an aging test, and comprises a plurality of first cavities for respectively placing variable frequency boards and supplying driving voltage output by the variable frequency boards for driving compressors to run. The load cabinet comprises a plurality of second cavities, a plurality of selection switches and a plurality of compressors.

2. The frequency board burn-in test apparatus of claim 1, wherein, The compressors are of at least two types and are respectively suitable for different types of the variable frequency boards. One of the compressors of each type is arranged in the same second cavity. The selection switch comprises an input end and at least two output ends.

3. A frequency conversion board aging test device with high safety, characterized in that, Each output end is connected with the compressors of each type. The input end is connected with the test cabinet for receiving the driving voltage. The selection switch can select one of the output ends to be connected with the input end.

4. The frequency board burn-in test apparatus of claim 3, wherein The load cabinet further comprises a manual control switch. The selection switch is a double-through relay which comprises a control coil, a first contact group, a second contact group and a third contact group. The control coil is connected with a low-voltage power source in series with the manual control switch.

5. The frequency board burn-in test apparatus of claim 4, wherein, The first contact group, the second contact group and the third contact group respectively comprise a plurality of contacts. The first contact group is connected with the second contact group when the control coil is electrified and is connected with the third contact group when the control coil is de-energized. The compressors comprise two types. The contacts of the second contact group are respectively connected with the compressors of one type. The contacts of the third contact group are respectively connected with the compressors of the other type. The application relates to a test cabinet and a load cabinet. The test cabinet can form an environment meeting the conditions of an aging test, and comprises a plurality of first cavities for respectively placing variable frequency boards and supplying driving voltage output by the variable frequency boards for driving compressors to run. The load cabinet comprises a plurality of second cavities, a plurality of controllable switches and a plurality of compressors. The compressors are of at least two types and are respectively suitable for different types of the variable frequency boards. One of the compressors of each type is arranged in the same second cavity. Each controllable switch is arranged corresponding to each compressor and is connected with each type of the compressors and the test cabinet for controlling the compressors of one type in the second cavity to receive the driving voltage. The compressors comprise two types. The controllable switches in the second cavities are respectively a first relay and a second relay. The first relay comprises a first control coil and a first switch group. The second relay comprises a second control coil and a second switch group. The load cabinet further comprises a manual control switch which is connected with the first control coil and the second control coil to make the first control coil or the second control coil connected with a low-voltage power source. The first switch group is connected with the compressors of one type and the test cabinet. The second switch group is connected with the compressors of the other type and the test cabinet. The first relay further comprises a third switch. The second relay further comprises a fourth switch. The fourth switch is a normally closed contact switch which is connected with the first control coil in series. The third switch is a normally closed contact switch which is connected with the second control coil in series.

6. The frequency board burn-in test apparatus of claim 5, wherein, The first relay further comprises a fifth switch; the second relay further comprises a sixth switch; The load cabinet further comprises a plurality of indicator lamps, which are respectively arranged in the second cavities corresponding to the compressors, are respectively connected in series with the fifth switches and the sixth switches, and are connected with the low-voltage power supply.

7. The frequency board burn-in test apparatus of claim 6, wherein The indicator lamps comprise two colors, which correspond to the compressors of different types in the second cavities.

8. The frequency board burn-in test apparatus of any one of claims 4 to 7, wherein, The load cabinet is a square box body, and is provided with multiple layers; the second cavities are sequentially arranged along the length direction of each layer.

9. The frequency board burn-in test apparatus of claim 8, wherein, The load cabinet further comprises a plurality of fans. The second cavities are arranged left and right, and are communicated front and back; openings are arranged in front and back of the second cavities; the fans are fixedly arranged on the openings, and the air directions are the same.

10. The frequency board burn-in test apparatus of claim 8, wherein, The load cabinet further comprises a mounting frame, which is a square frame body, is arranged longitudinally, is located at one end of the length direction of the load cabinet, and comprises an outer frame and a plurality of cross beams arranged in the outer frame in a transverse direction. A plurality of long through holes are formed in the cross beams along the length direction of the cross beams, and are used for mounting the first relays and the second relays.

Images