Leak detection kit

Abstract

Leak detection assembly (1) comprising a leak detector (3), an auxiliary vacuum pump (4) and a vacuum closing device (5) having a vacuum valve (12) and a vacuum actuator (13) configured to actuate a shutter (14) of the vacuum valve. Abstract figure: figure 1

Description

Title of the invention: Leak detection assembly Technical field of the invention

[0001] The present invention relates to a leak detection assembly intended to be connected to the internal volume of an object to be tested. Technical background

[0002] A known method for checking the leak-tightness of an object involves performing a tracer gas detection test. This method relies on detecting the passage of tracer gas through any leaks in the object being tested. An increase in the measured tracer gas concentration signal indicates the presence of a leak in the object.

[0003] One of the main qualities of a leak detector is its pre-evacuation capacity, that is, the leak detector's ability to quickly create a primary vacuum in the internal volume of the object to be tested. The pre-evacuation capacity of the leak detector depends primarily on that of the primary vacuum pump internal to the leak detector. The larger this vacuum pump, the higher its pumping performance. Since the dimensions of the detector's internal vacuum pump also determine the dimensions of the leak detector, it is therefore necessary to find the best compromise between size and performance.

[0004] To increase performance, however, it is possible to use an auxiliary vacuum pump, external to the leak detector, and to connect this auxiliary vacuum pump in parallel with the internal vacuum pump of the leak detector via a solenoid valve. Opening the solenoid valve allows fluid communication between the object under test and the auxiliary vacuum pump, in addition to the internal vacuum pump of the leak detector, or even instead of the vacuum pump of the leak detector in some cases.

[0005] However, the solenoid valves generally used to perform this function have certain disadvantages.

[0006] These solenoid valves exhibit high conductance in the open position to avoid restricting the pumping flow through them and therefore require high power supplies. This high power is generated by large coils, resulting in significant weight and cost, as well as layout challenges.

[0007] Moreover, these high power levels require a mains power supply, which entails other drawbacks. It is indeed necessary to connect the solenoid valves to a power supply separate from the control cables. Furthermore, several re Different solenoid valves, each adapted to the voltage of the electrical grid of the country in which the vacuum pump is intended to be used, must be managed, which can be costly. Summary of the invention

[0008] One of the aims of the present invention is to at least partially overcome these drawbacks by proposing an improved leak detection system.

[0009] To this end, the invention relates to a leak detection system comprising: - an inlet intended to be connected to the internal volume of an object to be tested, - a leak detector, one input of which is connected to the input of said assembly, and - an auxiliary vacuum pump, characterized in that the leak detection assembly further comprises a vacuum closing device having: - a vacuum valve comprising a movable obturator between an open position establishing fluid communication between the auxiliary vacuum pump and the inlet of said assembly and a closed position fluidly isolating the auxiliary vacuum pump from the inlet, a piston integral with the obturator and a diaphragm connected to the piston and delimiting a vacuum chamber, - a vacuum actuator configured to actuate the shutter, said actuator comprising a reservoir, a first solenoid valve interposed between the vacuum chamber and the reservoir and a second solenoid valve interposed between the auxiliary vacuum pump and the reservoir, the closing of the first solenoid valve and the opening of the second solenoid valve allowing the reservoir to be evacuated by the auxiliary vacuum pump, the closing of the second solenoid valve and the opening of the first solenoid valve creating a vacuum in the vacuum chamber, moving the shutter to the open position.

[0010] The suction power of the auxiliary vacuum pump is thus used to actuate the movable shutter of the vacuum valve and to connect or isolate the internal volume of the object to be tested from the auxiliary vacuum pump.

[0011] The solenoid valves of the small vacuum valve do not require a high electrical power supply and therefore do not need to be powered by mains voltage.

[0012] Therefore, it is not necessary to adapt the mains supply voltage of these solenoid valves to the electrical voltage of the country of destination of the leak detection assembly.

[0013] Furthermore, it is not necessary to provide, on the one hand, power supply cables for the solenoid valves and, on the other hand, control cables for opening / closing the solenoid valves, or for supplying or cutting off the power supply to the low the voltage of the solenoid valve coils being sufficient for control.

[0014] Moreover, since the solenoid valves are small in size, they are lighter, cheaper and easier to arrange in the leak detection assembly.

[0015] The leak detection assembly may further include one or more of the features described below, taken alone or in combination.

[0016] The reservoir may have a volume greater than or equal to 10cm3.

[0017] The reservoir may have a volume less than or equal to 300cm3.

[0018] According to one embodiment, the first solenoid valve is configured to allow the passage of ambient air in the closed position.

[0019] The first solenoid valve can be a three-way valve, a first way being formed by a channel opening to the outside, a second way being connected to the vacuum chamber and a third way being connected to the tank, the second and third ways communicating fluidly together and the first way being closed in the open position, the first and second ways communicating fluidly together and the third way being closed in the closed position.

[0020] The vacuum actuator may include a chopper configured to chop the output supply voltage of the leak detector powering the solenoid valves. The chopper chops the supply voltage to the solenoid valves and thus reduces heating.

[0021] The chopper can be mounted on an electronic board housed in a connector housing for the vacuum actuator. This connector allows the solenoid valves to be connected to the output power supply of the leak detector. Integrating the electronic board into the connector housing allows the power supply management of the vacuum actuator to be externalized from the control unit, which is integrated into the leak detector. This reduces the cost of the leak detector, which can be a standard model.

[0022] The leak detector may include a control unit configured to control the opening and closing of the solenoid valves of the vacuum valve by supplying and cutting off the supply to these solenoid valves according to the pressure measured at the inlet of the leak detector by a pressure sensor of the leak detector.

[0023] According to one embodiment, the leak detector includes a pumping device and a gas analyzer connected to the pumping device to measure the concentration of at least one gaseous species used as a tracer gas at the inlet of the leak detector.

[0024] According to one embodiment, the pumping device comprises a secondary vacuum pump and a primary vacuum pump mounted in series, the secondary vacuum pump being arranged upstream of the primary vacuum pump in the direction of gas flow.

[0025] According to one embodiment, the primary vacuum pump is a vane pump or a dry primary vacuum pump.

[0026] According to one embodiment, the auxiliary vacuum pump is a diaphragm pump, a vane pump or a dry primary vacuum pump. Brief description of the figures

[0027] Other advantages and features will become apparent from the following description of a particular, but by no means limiting, embodiment of the invention, as well as from the accompanying drawings in which:

[0028] [Fig-1] Fig. 1 is a schematic view of an example of an installation of leak detection.

[0029] [Fig.2] The [Fig.2] shows a cross-sectional view of elements of a vacuum closing device of the leak detection assembly of the [Fig.1], with a vacuum valve in the closed position.

[0030] [Fig.3] The [Fig.3] shows the elements of the [Fig.2] with the vacuum valve in the open position.

[0031] [Fig.4] The [Fig.4] shows elements of a vacuum actuator of the vacuum closing device.

[0032] In these figures, identical elements bear the same reference numbers. Detailed description

[0033] The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments, without departing from the scope of the invention as defined by the claims.

[0034] Figure 1 shows an example of a leak detection assembly 1 comprising an inlet 2 intended to be connected to the internal volume of an object to be tested. The term "object to be tested" is defined as an object or installation whose leak-tightness is to be checked.

[0035] The leak detection assembly 1 is used in spray mode. The inlet 2 is connected to the internal volume of the object to be tested, which is sprayed with tracer gas or contained in a chamber pressurized with tracer gas.

[0036] Assembly 1 includes a leak detector 3, an auxiliary vacuum pump 4 and a vacuum closure device 5 allowing the auxiliary vacuum pump 4 to be isolated or connected to the internal volume of the object to be tested connected to the inlet 2 of assembly 1.

[0037] The input 11 of the leak detector 3 is connected to the input 2 of the leak detection assembly 1.

[0038] According to one embodiment, the leak detector 3 includes a pumping device 6 and a gas analyzer 7 connected to the pumping device to measure the concentration of at least one gaseous species used as a tracer gas at the inlet 11 of the leak detector 3.

[0039] The pumping device 6 comprises, for example, a secondary vacuum pump 8, such as a turbomolecular pump, and a primary vacuum pump 9 mounted in series, the secondary vacuum pump 8 being arranged upstream of the primary vacuum pump 9 in the direction of gas flow (see arrows in [Fig. 1]). The primary vacuum pump 9 is, for example, a vane pump or a small dry primary vacuum pump.

[0040] The gas analyzer 7 is, for example, connected to the suction of the secondary vacuum pump 8. The measuring cell of the gas analyzer 7 can thus be placed under a low pressure of approximately 104 mbar. The gas analyzer 7 includes, for example, a mass spectrometer.

[0041] A test valve 10a, 10b is fluidly connected to the pumping device 6 for example at an intermediate compression stage of the secondary vacuum pump 8 and / or to the suction of the secondary vacuum pump 9 (depending on the level of leakage sought).

[0042] The auxiliary vacuum pump 4 is for example a diaphragm pump, a vane pump or a small dry primary vacuum pump.

[0043] In operation, when the vacuum closure device 5 allows it, the auxiliary vacuum pump 4 depressurizes the internal atmosphere of the object to be tested relative to the external atmosphere, alone or in parallel with the pumping device 6 of the leak detector 3.

[0044] Then, starting from a low threshold pressure, the pumping device 6 of the leak detector 3, alone or in parallel with the auxiliary vacuum pump 4, is brought into fluidic communication with the object to be tested. Thus, in the event of leaks, the tracer gas enters the leak detector 3 and propagates to the gas analyzer 7. A portion of the gas collected by the pumping device 6 of the leak detector 3, possibly containing the tracer gas that reveals a leak, is then analyzed by the gas analyzer 7, which provides a measurement of the tracer gas concentration to a control unit 29 of the leak detector 3.

[0045] To isolate or connect the auxiliary vacuum pump 4 with the internal volume of the object to be tested, the vacuum closure device 5 includes a vacuum valve 12 and a vacuum actuator 13 configured to actuate a shutter 14 of the vacuum valve 12.

[0046] As can be seen in figures 2 and 3, in addition to the obturator 14, the vacuum valve 12 includes a piston 15 and a diaphragm 16 connected to the piston 15 and delimiting a vacuum chamber 17.

[0047] The piston 15 is integral with the obturator 14; they are, for example, fixed together by a pin 18 of the piston 15.

[0048] The diaphragm 16 of the vacuum valve 12, such as a roll-up diaphragm, is connected to the piston 15 for example at a central location thereof.

[0049] More specifically, the vacuum valve 12 comprises a hollow body 19 receiving the obturator 14 and the piston 15, the diaphragm 16 separating the interior of the hollow body 19 into a first chamber or vacuum chamber 17 and a second chamber 20 or atmospheric pressure chamber, the piston 15 separating the second chamber 20 from a third chamber 21 comprising a seat for the obturator 14.

[0050] The diaphragm 16 ensures the seal between the vacuum chamber 17 and the second chamber 20. The diaphragm 16 is, for example, clamped on its outer periphery between two pieces of the hollow body 19 assembled together, the diaphragm 16 also being fixed to the piston 15 at the center, for example at the end of the axis 18 of the piston 15.

[0051] The second chamber 20, located on the side of the axis 18 of the piston 15 and the obturator 14, communicates with the outside via an orifice (not visible in [Fig. 2]). The pressure of this second chamber 20 is thus maintained at the surrounding external pressure (or ambient pressure or atmospheric pressure).

[0052] The third chamber 21 has a first orifice 22 fluidly connected to a suction 23 of the auxiliary vacuum pump 4, and a second orifice 24 fluidly connected to the inlet 2 of the leak detection assembly 1. It is also possible in another equivalent configuration that the first orifice 22 is fluidly connected to the inlet 2 of the leak detection assembly 1 and that the second orifice 24 is fluidly connected to the suction 23 of the auxiliary vacuum pump 4.

[0053] The obturator 14 of the vacuum valve 12 is movable between an open position ([Fig.3]) and a closed position ([Fig.2]).

[0054] In the open position ([Fig.3]), the shutter 14 is away from its seat. The first and second orifices 21, 22, and therefore the auxiliary vacuum pump 4 and the inlet 2 of the leak detection assembly 1, are in fluidic communication.

[0055] In the closed position ([Fig.2]), the shutter 14 obstructs the first orifice 22, fluidly isolating the auxiliary vacuum pump 4 from the inlet 2 of the leak detection assembly 1.

[0056] The vacuum valve 12 is, for example, normally closed. The obturator 14 may have a seal to ensure the sealing of the obturator.

[0057] To actuate the shutter 14, the vacuum actuator 13 includes a reservoir 25, a first solenoid valve 26 and a second solenoid valve 27 ([Fig.1]).

[0058] The reservoir 25 is the volume interposed between the valves of the first and second solenoid valves 26, 27. The reservoir 25 has, for example, a volume greater than or equal to 10 cm3, such as greater than 30cm3 and / or less than or equal to 300cm3, such as less than 60 cm3, such as between 10cm3 and 300 cm3, such as between 30cm3 and 60cm3, so as to be able to expand the volume of the vacuum chamber 17 from an atmospheric pressure to a low pressure, for example, between 1 Pa and 1000 Pa.

[0059] The first and second solenoid valves 26, 27 are for example normally closed and electrically supplied to be controlled to open.

[0060] The first solenoid valve 26 is interposed between the vacuum chamber 17 and the reservoir 25. The opening of the first solenoid valve 26 establishes fluid communication between the vacuum chamber 17 and the reservoir 25. The closing of the first solenoid valve 26 fluidly isolates the vacuum chamber 17 from the reservoir 25.

[0061] The first solenoid valve 26 can be configured to allow the passage of ambient air in the closed position.

[0062] According to one embodiment, the first solenoid valve 26 is a three-way valve. A first port 26a is an air inlet, formed by a channel opening to the outside, which may be provided with a filter 36. A second port 26b is connected to the vacuum chamber 17 and a third port 26c is connected to the reservoir 25.

[0063] In the open position, the second and third channels 26b, 26c communicate fluidly together and the first channel 26a is closed ([Fig.3]).

[0064] In the closed position, the first port 26a communicates fluidly with the second port 26b and the third port 26c is closed ([Fig.2]). Filtered air passes through the first solenoid valve 26, entering the vacuum chamber 17.

[0065] The second solenoid valve 27 is interposed between the auxiliary vacuum pump 4 and the reservoir 25. Opening the second solenoid valve 27 establishes fluid communication between the auxiliary vacuum pump 4 and the reservoir 25. Closing the second solenoid valve 27 fluidly isolates the auxiliary vacuum pump 4 from the reservoir 25.

[0066] The closing of the first solenoid valve 26 and the opening of the second solenoid valve 27 allow the reservoir 25 to be evacuated by the auxiliary vacuum pump 4.

[0067] The closing of the second solenoid valve 27 and the opening of the first solenoid valve 26 create a vacuum in the vacuum chamber 17, moving the obturator 14 into the open position.

[0068] These small solenoid valves 26, 27 can be powered at a low voltage, i.e., by a power supply from the leak detector 3 output, such as a 24Vdc supply. Switching the power supply on or off allows the solenoid valves 26, 27 to be opened and closed without the need for any additional provisions. on one side a mains power cable and on the other side, a control cable for the solenoid valves.

[0069] The obturator 14 of the vacuum valve 12 can be elastically forced into the closed position, for example, by an elastic element 28 of the vacuum valve 12, such as a spring. One end of the elastic element 28 can be fixed to the piston 15, for example, under a head of the piston 15, the other end of the elastic element 28 being fixed to the obturator 14, the elastic element surrounding the axis 18 of the piston 15. This elastic element 28 ensures the closure of the vacuum valve 12 when the coil of the first solenoid valve 26 is not electrically energized.

[0070] The leak detector 3 further includes a control unit 29, such as an electronic board, comprising one or more controllers or microcontrollers or processors and a memory, for executing sequences of program instructions enabling the implementation of a method for controlling the operating parameters of the leak detector 3 and the solenoid valves 10a, 10b, 26, 27. The control unit 29 is in particular configured to control the opening and closing of the solenoid valves 26, 27 of the vacuum valve 12, for example by supplying and cutting off the supply to these solenoid valves according to the pressure measured at the inlet 11 of the leak detector 3 by a pressure sensor 30 of the leak detector 3.

[0071] It can also be foreseen that the vacuum actuator 13 includes a chopper configured to chop the output supply voltage. Indeed, these solenoid valves 26, 27 heat up when continuously powered (up to 90°C at 24Vdc). This significant heating can cause premature aging of the electronics and a risk of burns to the user. The chopper chops the supply voltage to the solenoid valves 26, 27 and thus reduces this heating.

[0072] According to one embodiment, the chopper is mounted on an electronic board 32 housed in a casing 33 of an electrical connector 34 of the vacuum actuator 13 ([Fig. 4]). This integration of the electronic board into the casing 33 of the electrical connector 34 allows the power supply management of the vacuum actuator 13 to be externalized from the control unit 29, which is itself integrated into the leak detector 3, thus reducing the cost of the leak detector 3, which can be a standard unit.

[0073] The electrical connector 34 connects mechanically and electrically to a complementary connector carried by the leak detector 3 to connect the electrical conductors 35 of the solenoid valves 26, 27 to the output supply of the leak detector 3 to supply the coils of the solenoid valves 26, 27 ([Fig. 1]).

[0074] The operation is as follows:

[0075] In the closed position ([Fig.2]), the shutter 14 is elastically stressed by bearing on Its seat in the third chamber 21 closes the first orifice 22, thus fluidly isolating the auxiliary vacuum pump 4 from the inlet 2 of the leak detection assembly 1. The solenoid valves 26, 27 are initially closed, for example. Filtered air passes through the first solenoid valve 26, entering the vacuum chamber 17 at atmospheric pressure.

[0076] The supply of the second solenoid valve 27 causes it to open, putting the auxiliary vacuum pump 4 and the reservoir 25 into fluidic communication, which allows the reservoir 25 to be evacuated by the auxiliary vacuum pump 4.

[0077] When the user starts a detection cycle, if the pressure measured at the inlet 2 by the pressure sensor 30 is greater than a threshold, for example if the measured pressure is atmospheric pressure, then the control unit 29 of the leak detector controls the opening of the vacuum valve 12.

[0078] For this purpose, the control unit 29 controls the closing of the second solenoid valve 27 by cutting off its supply, fluidly isolating the auxiliary vacuum pump 4 from the tank 25, and controls the opening of the first solenoid valve 26, by supplying it.

[0079] Opening the first solenoid valve 26 (arrow Fl in [Fig. 3]) establishes fluid communication between the vacuum chamber 17 and the low-pressure reservoir 25, creating a vacuum in the vacuum chamber 17. The pressure difference across the diaphragm 16 between the vacuum chamber 17 and the second chamber 20 at atmospheric pressure deforms the diaphragm 16, drawing the piston 15 into the lower-pressure vacuum chamber 17. The piston 15, and therefore the obturator 14, are moved to the open position (arrow F2 in [Fig. 3]).

[0080] In the open position of the vacuum valve 12 ([Fig. 3]), the obturator 14 is away from its seat. The first and second orifices 22, 24, and therefore the auxiliary vacuum pump 4 and the inlet 2 of the leak detection assembly 1, are in fluidic communication. The auxiliary vacuum pump 4 can evacuate the internal volume of the object to be tested connected to the inlet 2 of the leak detection assembly 1.

[0081] This vacuuming by the auxiliary vacuum pump 4 can be carried out in parallel pumping with the primary vacuum pump 9 of the leak detector 3 or only via the auxiliary vacuum pump 4 and in this case, the primary vacuum pump 9 is only used to allow the operation of the secondary vacuum pump 8 of the leak detector 3.

[0082] Vacuuming from atmospheric pressure to a low threshold pressure carried out in parallel by the auxiliary vacuum pump 4 and the primary vacuum pump 9 of the leak detector 3 makes it possible to reduce the pressure descent time of the internal volume of the object to be tested.

[0083] Pumping the internal volume of the object to be tested by the auxiliary vacuum pump 4 alone makes it possible to avoid using the pumping device 6 of the detector for high pressures and thus to preserve it, for example, from the possible presence of polluting gaseous species contained in the object to be tested.

[0084] When the pressure measured at the inlet 2 by the pressure sensor 30 becomes less than or equal to the threshold, the control unit 29 of the leak detector controls the closure of the vacuum valve 12, the maintenance under vacuum being able to be ensured only by the leak detector 3.

[0085] To control the closure of the vacuum valve 12 at the end of the measurement cycle, or when the leak detector alone maintains the vacuum, the control unit 29 controls the closure of the first solenoid valve 26 by cutting off its power supply. This fluidically isolates the vacuum chamber 17 from the reservoir 25. Filtered ambient air can then pass through the first solenoid valve 26 and enter the vacuum chamber 17. The pressure in the vacuum chamber 17 increases and returns to atmospheric pressure. The rebalancing of the pressures on either side of the diaphragm 16 allows it to return to its resting shape, which enables the obturator 14 to return against its seat in the second chamber 21 ([Fig. 2]) and thus provides fluidic isolation between the auxiliary vacuum pump 4 and the internal volume of the object to be tested, which is connected to the inlet 2 of the leak detection assembly 1.

[0086] The control unit 29 can also control the opening of the second solenoid valve 27 in order to put the tank under vacuum 25 in preparation for a future measurement cycle.

[0087] The suction power of the auxiliary vacuum pump 4 is thus used to actuate the movable obturator 14 of the vacuum valve 12 and to connect or isolate the internal volume of the object to be tested from the auxiliary vacuum pump 4.

[0088] The solenoid valves 26, 27 of the small-sized vacuum valve 12 do not require a high electrical power supply and therefore do not need to be powered by mains voltage.

[0089] Therefore, it is not necessary to adapt the mains supply voltage of these solenoid valves 26, 27 to the electrical voltage of the country of destination of the leak detection assembly 1.

[0090] Furthermore, it is not necessary to provide, on the one hand, power supply cables for the solenoid valves and, on the other hand, control cables for opening / closing the solenoid valves, the supply or cutting off of the supply of the low voltage of the coils of the solenoid valves 26, 27 being sufficient.

[0091] Moreover, since the solenoid valves 26, 27 are small in size, they are lighter, cheaper and easier to arrange in the leak detection assembly 1.

Claims

Claims

1. Leak detection assembly (1) comprising: - an inlet (2) intended to be connected to the interior volume of an object to be tested, - a leak detector (3) of which an inlet (11) is connected to the inlet (2) of said assembly (1), and - an auxiliary vacuum pump (4), characterized in that the leak detection assembly (1) further comprises a vacuum closing device (5) having: - a vacuum valve (12) comprising a shutter (14) movable between an open position placing the auxiliary vacuum pump (4) in fluid communication with the inlet (2) of said assembly (1) and a closed position fluidly isolating the auxiliary vacuum pump (4) from the inlet (2), a piston (15) secured to the shutter (14) and a membrane (16) connected to the piston (15) and delimiting a vacuum chamber (17), - a vacuum actuator (13) configured to actuate the shutter (14), said actuator (13) comprising a reservoir (25),a first solenoid valve (26) interposed between the vacuum chamber (17) and the reservoir (25) and a second solenoid valve (27) interposed between the auxiliary vacuum pump (4) and the reservoir (25), the closing of the first solenoid valve (26) and the opening of the second solenoid valve (27) allowing the reservoir (25) to be placed under vacuum by the auxiliary vacuum pump (4), the closing of the second solenoid valve (27) and the opening of the first solenoid valve (26) creating a vacuum in the vacuum chamber (17), moving the shutter (14) to the open position.,

2. Leak detection assembly (1) according to the preceding claim, characterized in that the reservoir (25) has a volume greater than or equal to 10cm3.

3. Leak detection assembly (1) according to the preceding claim, characterized in that the reservoir (25) has a volume less than or equal to 300cm3.

4. Leak detection assembly (1) according to one of the preceding claims, characterized in that the first solenoid valve (26) is configured to allow the passage of ambient air in the closed position.

5. Leak detection assembly (1) according to one of the preceding claims, characterized in that the first solenoid valve (26) is a three-way valve, a first way (26a) being formed by a channel opening to the outside, a second way (26b) being connected to the vacuum chamber (17) and a third way (26c) being connected to the tank (25), the second and third ways (26b, 26c) communicating fluidly with each other and the first way (26a) being closed in the open position, the first way (26a) and the second way (26b) communicating fluidly with each other and the third way (26c) being closed in the closed position.

6. Leak detection assembly (1) according to one of the preceding claims, characterized in that the vacuum actuator (13) comprises a chopper configured to chop an output supply voltage of the leak detector (3) supplying the solenoid valves (26, 27).

7. Leak detection assembly (1) according to the preceding claim, characterized in that said chopper is mounted on an electronic card (32) received in a housing (33) of an electrical connector (34) of the vacuum actuator (13), the electrical connector (34) making it possible to connect the solenoid valves (26, 27) to an output power supply of the leak detector (3).

8. Leak detection assembly (1) according to one of the preceding claims, characterized in that the leak detector (3) comprises a control unit (29) configured to control the opening and closing of the solenoid valves (26, 27) of the vacuum valve (12) by supplying and cutting off the supply of these solenoid valves (26, 27) as a function of the pressure measured at the inlet (11) of the leak detector (3) by a pressure sensor (30) of the leak detector (3).

9. Leak detection assembly (1) according to one of the preceding claims, characterized in that the leak detector (3) comprises a pumping device (6) and a gas analyzer (7) connected to the pumping device (6) for measuring the concentration of at least one gaseous species used as tracer gas at the inlet (11) of the leak detector (3).

10. Leak detection assembly (1) according to the preceding claim, characterized in that the pumping device (6) comprises a secondary vacuum pump (8) and a primary vacuum pump (9) connected in series, the secondary vacuum pump (8) being arranged upstream of the primary vacuum pump (9) in the direction of gas flow.

11. Leak detection assembly (1) according to the preceding claim, characterized in that the primary vacuum pump (9) is a vane pump or a dry primary vacuum pump.

12. Leak detection assembly (1) according to one of the preceding claims, characterized in that the auxiliary vacuum pump (4) is a diaphragm pump, a vane pump or a dry primary vacuum pump.