Electromechanical actuator and actuator-valve unit

Abstract

The invention relates to an electromechanical actuator (1), in particular for actuating a valve (101) connectable thereto; comprising a housing (2) having a housing interior (2.1); an electromagnetic actuating device (3) housed in the housing interior (2.1); the housing (2) has a housing interior (2.1), and a seal (4) which is designed to seal the housing interior (2.1) from the outside, the housing (2) having at least one, in particular closable, leakage path (5) for checking the sealing of the seal (4), the leakage path (5) enabling a fluid exchange between the housing interior (2.1) and the outside (2.2) of the housing (2). The invention also relates to an actuator-valve unit (100) comprising the electromechanical actuator (1).

Description

Technical Field

[0001] This invention relates to an electromechanical actuator and an actuator-valve unit. Background Technology

[0002] Traditional electromechanical actuators (also commonly referred to as "actuators") typically have a housing with internal space and an electromagnetic actuation device housed within that housing. This traditional actuation device usually includes a coil and an electromagnetically movable part (such as an armature), where energizing the coil causes the part to move. Traditional actuators typically have a seal that separates the housing's internal space from the outside.

[0003] However, a drawback of these traditional configurations is that the seal's tightness is difficult to verify. The housing is typically sealed, preventing fluid exchange between the internal space of the housing and the external environment (especially the atmosphere) outside the seal. For example, if pressure is applied to the external interface of the housing where the seal is located (e.g., a valve interface) in these solutions to check its tightness, it is difficult to determine whether it is the seal itself or just the housing that is sealed. Summary of the Invention

[0004] The object of this invention is to overcome these disadvantages. A specific object of this invention is to provide an electromechanical actuator capable of easy and reliable sealing testing. A further object of this invention is to provide an actuator-valve unit possessing these advantages.

[0005] This problem is addressed through the features of the independent claims. The dependent claims describe the preferred embodiments of the invention.

[0006] The stated objective is achieved specifically by the electromechanical actuator according to claim 1. This actuator is specifically designed to actuate a valve connected thereto. The actuator has a housing with an internal space. The actuator also has an electromagnetic actuation device housed within the internal space of the housing. Furthermore, the actuator is equipped with a seal for sealing the internal space of the housing from the outside. The housing has at least one leakage path for checking the sealing performance of the seal. The leakage path allows for fluid exchange between the internal space of the housing and the outside of the housing.

[0007] As mentioned above, the leakage path allows fluid to exchange with the environment of the housing (e.g., the atmosphere). This means that during the aforementioned leak test, if the seal is not tight and subjected to (test) pressure, fluids such as air may escape from the housing. Therefore, if this pressure hardly increases or does not increase at all, it can be concluded that the seal is not tight. Conversely, if the pressure increases accordingly, it can be concluded that the seal is tight because the housing is intentionally leaking through the leakage path. In other words, assuming a tight seal, fluid exchange preferably can only occur through the leakage path.

[0008] As an alternative to or supplement to the aforementioned pressurization and pressure testing, it is possible to check whether the corresponding fluid is present in the leak path or flows through that path. The collected amount can also be used to determine the extent of leakage in the seal.

[0009] In a preferred embodiment, at least one leak path can be sealed. Specifically, it is resealable and (non-destructively) reopenable so that leak testing can be repeated. It should be noted that a leak path in this sense is an intentionally and explicitly created leak path and is not equivalent to manufacturing defects or wear caused by prolonged use / storage. The presence of at least one leak path should be specifically understood as an addition in addition to such possible defects or wear. Alternative terms for this leak path are preferably "venting channel" or "venting path," where the fluid to be vented is not necessarily air.

[0010] At least one leakage path is preferably fluidly connected to a seal. In other words, one end of the leakage path (hereinafter referred to as the "first end") is sealed by a seal (provided that the seal is tight), while the other end (hereinafter referred to as the "second end") is connected to the outside of the housing.

[0011] In the context of this invention, "fluid exchange" preferably refers to fluid supplied from the outside via a sealing test device. For example, one such device is a fluid pump with a pressure sensor for recording and evaluating pressure profiles. This device may be connected to the actuator on the outside of the housing opposite the seal and / or on the outside of the housing at one end of the leakage path (a second end).

[0012] In a preferred embodiment, the actuation device includes a coil and at least one movable component. The movable component, such as an armature, can be moved electromagnetically by the coil. The movable component or armature, in turn, causes movement of the actuator, thereby actuating the actuation device.

[0013] Here, a portion of the leakage path is formed between the coil and the armature. In other words, a portion of the leakage path passes through the gap between the coil and the armature. Here, the aforementioned portion of the leakage path extends in an axial direction, which is parallel to the longitudinal extension direction of the armature or parallel to the winding axis of the coil.

[0014] The actuating device preferably has a component that is immovable relative to the housing. An example of such an immovable component is a pole core. The magnetic flux generated by the coil moves the armature to the pole core, thereby actuating the actuating device or actuator.

[0015] Preferably, a portion of the leakage path is formed between the coil and the pole core. In a preferred example, a portion of the leakage path passes through the space between the coil and the armature, and between the coil and the pole core. The pole core preferably has at least one pole core groove on its radially outer surface, which forms part of the leakage path.

[0016] The core groove is preferably straight, especially extending parallel to the longitudinal or axial direction of the actuator.

[0017] In some preferred embodiments, the core groove is spiral-shaped. The core groove, or the leakage path portion formed therefrom, extends along the longitudinal and circumferential directions of the core.

[0018] In some preferred embodiments, the electrode core has an electrode core support disk, which preferably rests against the housing. The electrode core support disk preferably forms the region of the electrode core's maximum radius or circumference. More preferably, the electrode core has at least one recess in the electrode core support disk, which forms part of a leakage path.

[0019] Preferably, the electrode core has a plurality of such recesses distributed along the circumferential direction of the electrode core, such that a portion of the leakage path passes through at least one recess in the electrode core support disk between the electrode core and the housing. The at least one recess in the electrode core support disk is preferably provided as an alternative to or supplement to the aforementioned clearance fit. Specifically, the at least one recess is groove-shaped. The at least one recess preferably extends axially into and is connected to or continuously formed therewith the electrode core groove.

[0020] A further advantage is that the housing has at least one housing recess that forms part of the leakage path. In particular, in the case of multiple such housing recesses, they are evenly distributed in the circumferential direction of the electrode core. Preferably, the housing recess is formed by cutting and / or milling, or preferably by overmolding a corresponding mold for the housing. This makes it particularly easy and cost-effective to manufacture a portion of the leakage path between the electrode core and the housing.

[0021] The aforementioned housing recesses are preferably configured such that, particularly in the case of multiple recesses, they are radially opposite to preferred recesses in preferred pole core recesses and / or preferred recesses in pole core support discs, respectively.

[0022] Preferably, the armature and the pole core, along with the variable air gap between them, are collectively surrounded by a sleeve, which seals the aforementioned components from the internal space of the housing, particularly the aforementioned intermediate space. Here, a portion of the leakage path is formed between the sleeve and the coil. For this purpose, in some preferred examples, a radial distance can be formed between the sleeve and the coil along the entire portion of the leakage path. The aforementioned pole core groove preferably extends to the outside of the sleeve relative to the longitudinal extension of the pole core. In other words, preferably, only one region of the pole core (relative to the longitudinal extension of the pole core) is surrounded by the sleeve, wherein preferably, another portion has the pole core groove.

[0023] Advantageously, the outer end (second end) of the leakage path is formed by a through-hole in the casing. The through-hole is in fluid communication with the internal space of the casing.

[0024] The cross-section of the through hole is preferably circular or rectangular. Specifically, the through hole is a channel.

[0025] Preferably, at least a portion of the through-hole extends through a connector plug of the actuator, to which the controller of the actuator can be connected. Such a connector plug has, for example, electrical pins or connectors that are electrically connected to the coil of the actuator and are capable of controlling or energizing the coil. The through-hole is preferably spatially separated from the connector. In other words, the aforementioned through-hole is not an opening or hole for the connector, but rather an additional through-hole to form a leakage path and connect it to the outside. Any opening or hole for the connector does not fluidly connect to the internal space of the housing, but rather connects to the coil at a separate point within the housing.

[0026] Advantageously, the through-hole of the leakage path has a fluid connection that can be connected to a fluid supply device for checking the seal's tightness. Such a fluid supply device is, for example, the aforementioned seal testing device, and can be, for example, an air pump and / or an oil pump and / or a water pump. The fluid connection is, for example, a hose connection or a threaded connection.

[0027] In some preferred embodiments, the actuator further includes a retaining bracket configured to secure the actuating device within the housing and preferably close the magnetic circuit. Here, the retaining bracket and the actuating device are at least partially in a clearance fit or press fit. Alternatively, or in addition to a clearance fit, the retaining bracket has at least one recess or groove forming part of a leakage path. Where the retaining bracket has a recess or groove and contacts the actuating device, the retaining bracket is preferably press-fitted with the actuating device. Where the retaining bracket does not have a recess or groove and contacts the actuating device, the retaining bracket is preferably in a clearance fit with the actuating device to form a leakage path.

[0028] Preferably, the aforementioned recess or groove of the retainer is an addition or replacement to the recess or groove at the corresponding position in the pole core recess or sleeve and / or armature.

[0029] The retainer particularly has at least one, preferably two, annular retainers in which the actuating device is housed. For example, the retainer has a first annular retainer and a second annular retainer, with the armature extending axially through the first annular retainer and the electrode extending through the second annular retainer. These annular retainers preferably accommodate the corresponding components in a clearance fit, such that a leakage path extends between the retainer and the corresponding component. Alternatively or additionally, the annular retainers have recesses or grooves on their inner peripheries through which the leakage path passes.

[0030] The present invention also relates to an actuator-valve unit. The actuator-valve unit has an electromechanical actuator according to one of the prior embodiments. Furthermore, the actuator-valve unit has a valve, wherein the valve is connected to a leakage path of the actuator via a seal. The valve is actuated by the actuator using an actuating device, i.e., opened and closed. If a leak occurs in the seal, the valve becomes fluidly connected to the leakage path. If the seal is tight, the valve does not become fluidly connected to the leakage path.

[0031] Preferably, the seal is designed to seal the internal space of the actuator housing from the valve. In other words, assuming a tight seal, the valve will not be in fluid contact with the internal space of the housing. Therefore, a leak test can be performed even after the actuator-valve unit is assembled, i.e., the actuator and valve are connected. The valve can be pressurized with fluid, and the pressure profile can be observed. Alternatively or additionally, the flow of fluid through the leak path can be checked at the other end of the leak path.

[0032] The present invention also relates to a sealing performance testing method according to the above description. For example, the method includes the following steps:

[0033] In the first step, if the leak path (especially its second end) is blocked, the leak path is opened in a non-destructive manner, such as by removing the plug or cap.

[0034] In the second step, fluid is applied to the seal, especially under pressure.

[0035] In the third step, the pressure profile at the seal is checked and / or fluid is detected or flows through a leak path.

[0036] The above steps can be performed on the actuator and / or the assembled actuator-valve unit. Attached Figure Description

[0037] Other details, advantages, and features of the invention will become apparent from the following description of embodiments with reference to the accompanying drawings. In the drawings:

[0038] Figure 1 A schematic cross-sectional view of an electromechanical actuator according to a first embodiment of the present invention is shown;

[0039] Figure 2 An enlarged detailed view of the actuator according to the first embodiment is shown;

[0040] Figure 3 A schematic detailed view of the components of the actuator according to the first embodiment is shown;

[0041] Figure 4 A schematic external view of the actuator according to the first embodiment is shown;

[0042] Figure 5 A schematic cross-sectional view of an actuator-valve unit including an electromechanical actuator according to a first embodiment is shown. Detailed Implementation

[0043] Figure 1 A schematic cross-sectional view of an electromechanical actuator 1 (hereinafter referred to as "actuator 1") according to a first embodiment of the present invention is shown. Figure 2 An enlarged detailed view of the actuator 1 according to the first embodiment is shown. Figure 2 It shows relative to Figure 1 A view rotated about axial direction 9 to explain leakage path 5 described below, which leakage path in Figure 1 The middle part is shown. Figure 3 A schematic detailed view of a component 3.3 of an actuator 1 according to a first embodiment is shown, wherein the component 3.3 is the pole core 3.3 as described below. Figure 4 A schematic external view of the actuator 1 according to the first embodiment is shown.

[0044] First, according to Figure 1 Explain the basic structure and function of actuator 1. Figure 1 The axial direction 9 of actuator 1 is shown. In addition, the radial direction 10 perpendicular to the axial direction 9 of actuator 1 is shown.

[0045] The actuator 1 has a housing 2. The housing 2 is preferably an injection-molded component, wherein the electromagnetic actuator 3 described below is preferably encapsulated in plastic. Figure 4 An external view of actuator 1 is also shown, particularly an external view of housing 2 (described below).

[0046] Actuator 1 also includes an electromagnetic actuation device 3. The actuation device 3 is housed within the internal space 2.1 of housing 2. Furthermore, actuator 1 is equipped with a seal 4 for sealing the internal space 2.1 of housing 2 from the outside. The environment or atmosphere 2.2 outside housing 2 is marked. Environment 2.2 can be air or a liquid, such as water or oil, and in this sense, it is a reference numeral for the area 2.2 outside housing 2 (or also referred to as "outside housing").

[0047] In this embodiment, the actuation device 3 includes a coil 3.1 and an armature 3.2, and the armature moves electromagnetically through the coil 3.1. Figure 1 The reciprocating motion direction 11 of the armature 3.2 is marked. It extends parallel to the axial direction 9. In addition, the actuating device 3 has a pole core 3.3 for closing the magnetic circuit and an actuating unit or plunger 7, which is moved by the armature 3.2 and causes the actuator 1 to be actuated.

[0048] The actuator 1 also has a retaining bracket 6 for securing the actuating device 3 within the housing 2. For this purpose, the retaining bracket 6 has two annular retainers 6.2 and 6.3, in which the actuating device 3 is housed. For example, the retaining bracket 6 has a first annular retainer 6.2 and a second annular retainer 6.3, with the armature 3.2 extending axially through the first annular retainer and the pole core 3.3 extending through the second annular retainer. Figure 1 In the cross-sectional view, the two supports 6.2 and 6.3 are also cut open for overview.

[0049] For example, if a sealing test is performed at the factory after the actuator 1 has been manufactured, pressurized fluid is typically applied to the actuator 1 at the point specified by reference numeral 13 on the housing 2 or the actuator 1, and the pressure curve is recorded. However, it is often difficult to determine whether the seal 4 of the actuator 1 or the housing 2 is tight. Point 13 specifically indicates the connection point where the valve 101 or any other actuable device can be connected.

[0050] from Figure 1 It can be seen that the seal 4 is preferably disposed at point 13. Preferably, the seal 4 is arranged at the actuating end of the actuating device 3, particularly at the outward acting end of the plunger 7, and seals this area away from the internal space 2.1 of the housing.

[0051] Therefore, the housing 2 of actuator 1 has the aforementioned leakage path 5, as will be referred to below. Figure 2 To explain in more detail. Leakage path 5 is used to check the sealing of seal 4, wherein leakage path 5 allows fluid exchange between the internal space 2.1 of housing 2 and the external space 2.2 of housing 2. In a further embodiment, actuator 1 may also have more than one leakage path 5. At least one leakage path 5 is preferably fluidly connected to seal 4. Leakage path 5 is sealed off from the environment 2.2 of housing 2 by seal 4 (assuming seal 4 is sealed). If seal 4 is not sealed, the internal space 2.1 of housing will be fluidly connected to environment 2.2 via leakage path 5 through leaking seal 4.

[0052] In this embodiment, the leakage path 5 has a first end 5.1 and a second end 5.2, wherein the first end 5.1 is fluidly connected to the seal 4, while the second end 5.2 is directly fluidly connected to the environment 2.2. In other words, the first end 5.1 of the leakage path 5 is sealed by the seal 4 (provided that the seal is tight), while the opposite second end 5.2 is connected to the outside of the housing 2.

[0053] In this embodiment, such as Figure 2 As shown, the leakage path 5 extends axially from the seal 4 (i.e., the first end 5.1) along the axis 9, as shown below.

[0054] A portion of the leakage path 5 extends between the electrode core 3.3 and the housing 2. For this purpose, the electrode core 3.3 is accommodated in the housing 2 with a clearance fit. Alternatively or additionally, such as... Figure 3 As shown, the pole core 3.3 has a pole core groove 3.5 on its radial outer surface 3.4, in which case the pole core groove is spiral.

[0055] In addition, from Figure 3 As can be seen, the electrode core 3.3 has an electrode core support disk 3.7, which preferably rests against the housing 2. The electrode core 3.3 also includes at least one recess 3.8. Preferably, a plurality of such recesses are distributed in the circumferential direction of the electrode core 3.3, such that the leakage path 5 passes through at least one recess 3.8 in the electrode core support disk 3.7 between the electrode core 3.3 and the housing 2. At least one recess 3.8 in the electrode core support disk 3.7 is provided as an alternative to or supplement to the aforementioned clearance fit. At least one recess 3.8 is specifically groove-shaped. At least one recess 3.8 preferably extends to the electrode core groove 3.5.

[0056] As an alternative or supplement to the above explanation, particularly regarding the leakage path 5 between the electrode core 3.3 and the housing 2, the housing 2 preferably has at least one housing recess 2.6, such as Figure 4 As shown. Figure 4 It shows along Figure 1 and Figure 2 The external view of the actuator 1 is the view along the axial direction 9 of the housing 2, that is, along point 13 (connection point 13).

[0057] In this example, the housing 2 has multiple, more specifically six, housing recesses 2.6, which are evenly distributed along the circumferential direction of the pole core 3.3. Figure 2 and Figure 5 One of the housing recesses 2.6 is also shown in dashed lines. Here, the recessed portion 2.6 of the housing 2 is formed by cutting or milling or by overmolding the housing 2 with a mold.

[0058] This allows for a particularly simple and cost-effective provision of a leakage path 5 between the core 3.3 and the housing 2.

[0059] The aforementioned housing recess 2.6 is preferably configured such that, particularly in the case of multiple recesses, it is radially opposite to the preferred recess 3.8 in the preferred pole core groove 3.5 and / or the pole core support plate 3.7, respectively.

[0060] Another portion of the leakage path 5 extends between the retaining bracket 6 or the second annular retainer 6.3 and the electrode core 3.3. In this case, the retaining bracket 6 preferably has a clearance fit with the electrode core 3.3. Optionally or additionally, the electrode core groove 3.5 (see...) Figure 3 It extends precisely at this position of the second annular support 6.3. Further, alternatively or additionally, the second annular retainer 6.3 has a recess or groove 6.1, such as... Figure 1 As shown.

[0061] Preferably, the section of the retaining bracket 6 that contacts the actuating device component and has no recess or groove 6.1 is clearance-fitted with the component to form a leakage path through the clearance fit. More preferably, the section of the retaining bracket 6 that contacts the driving device component and has a recess or groove 6.1 is press-fitted with the component to form a leakage path via the recess or groove 6.1. A similar relationship applies to the preferred presence of the core groove 3.5 (or correspondingly, through a clearance fit) on the common contact surface with the retaining bracket 6.

[0062] Another portion of the leakage path 5 extends between coil 3.1 and pole core 3.3, and between coil 3.1 and armature 3.2. In this example, the actuating device 3 has a sleeve 8 for receiving elongated portions (relative to their longitudinal extension) of pole core 3.3 and armature 3.2, wherein armature 3.2 is completely surrounded by sleeve 8 relative to its longitudinal extension. Sleeve 8 is spaced apart from coil 3.2 or its spool 3.6 relative to the radial direction 10. Alternatively or additionally, sleeve 8 also has a preferably helical groove (not shown) on its outer surface opposite to the radial direction of coil 3.2.

[0063] Leakage path 5 also extends between armature 3.2 and the first annular retainer 6.2. In this example, the first annular retainer 6.2 has the same configuration as the second annular retainer 6.3.

[0064] The housing 2 has a through-hole 2.5, which is in fluid communication with the internal space 2.1 of the housing. In this case, the through-hole 2.5 partially passes through the connector 2.3, and the controller of the drive unit 3 can be connected to the connector 12. Figure 2 As shown, the through hole 2.5 extends separately from the connector 12 and is spaced apart from the connector at least along the axial direction 10. The connector 12 does not pass through the through hole 2.5.

[0065] The second end 5.2 (i.e., the outer end) of the leakage path 5 passes through the through-hole 2.5 of the housing 2. The housing has a fluid connection 2.4, which can be resealed and reopened (non-destructively). For this purpose, the fluid connection 2.4 has, for example, a removable threaded cap or a plug cap. For example, a sealing test device such as a fluid pump can be externally connected to the fluid connection 2.4 to check the sealing performance of the seal 4.

[0066] The leakage path 5 explained above ensures fluid connectivity between the internal space 2.1 of the housing (more precisely, the seal 4) and the external environment 2.2 of the housing. This ensures reliable and accurate sealing tests for the actuator 1 and the seal 4.

[0067] Figure 5 A schematic cross-sectional view of an actuator-valve unit 100 including an electromechanical actuator 1 according to a first embodiment is shown.

[0068] This actuator-valve unit 100 also includes a valve 101. Valve 101 is connected to the leakage path 5 via a seal 4. Furthermore, Figure 5 The fluid flow 14 from valve 101 is shown connected to leakage path 5 via seal 4.

[0069] If the actuator-valve unit 100 is now subjected to fluid / pressure on the valve side and the seal 4 is tight, the pressure inside the valve 101 will increase. Otherwise, the fluid 14 flows through the leakage path 5 and exits the housing interior space 2.1 at the second end 5.2 outside the leakage path 5.

[0070] The current configuration can also verify whether the additional seal 4.1, which seals the actuator-valve unit 100 from the environment 2.2, is sealing. If the above-mentioned sealing test indicates that seal 4 is sealing, pressurized fluid can be supplied to the second end 5.2 of the leakage path 5. If a leak is detected, it can be concluded that the additional seal 4.1 is leaking.

[0071] In addition to the foregoing written description of the invention, reference is hereby expressly made to... Figures 1 to 5 The accompanying drawings of the present invention are provided for its additional disclosure.

[0072] List of reference numerals

[0073] 1. Actuator

[0074] 2. Shell

[0075] 2.1 Internal space of the shell

[0076] 2.2 Environment of the casing

[0077] 2.3 Connecting plug

[0078] 2.4 Fluid Connections

[0079] 2.5 Through Hole

[0080] 2.6 Housing recess

[0081] 3 Actuation device

[0082] 3.1 Coil

[0083] 3.2 Armature

[0084] 3.3 Core

[0085] 3.4 Radial outer surface of the pole core

[0086] 3.5 Pole Core Groove

[0087] 3.6 Bollard

[0088] 3.7 Core Support Plate

[0089] 3.8 Concave

[0090] 4. Seals

[0091] 4.1 Seals

[0092] 5. Leakage Path

[0093] 5.1 First End

[0094] 5.2 Second End

[0095] 6. Maintain the support

[0096] 6.1 Maintain the recess / groove in the support

[0097] 6.2 First annular retainer

[0098] 6.3 Second Annular Retainer

[0099] 7. Actuation Unit / Plug

[0100] 8 sleeves

[0101] 9. Axial direction

[0102] 10 Radial direction

[0103] 11 Reciprocating motion

[0104] 12 Connectors

[0105] 13. Points on the shell

[0106] 14 Fluid Flow

Claims

1. An electromechanical actuator (1), particularly for actuating a valve (101) connectable to said electromechanical actuator; said electromechanical actuator comprising: A shell (2) having an internal space (2.1); An electromagnetic actuator (3) housed within the internal space (2.1) of the housing; and A sealing element (4) is used to seal the internal space (2.1) of the housing from the outside, wherein... The housing (2) has at least one leakage path (5) that is particularly capable of being closed for checking the sealing of the seal (4), wherein the leakage path (5) allows for fluid exchange between the interior space (2.1) of the housing and the exterior (2.2) of the housing (2).

2. The electromechanical actuator (1) according to claim 1, wherein, The actuation device (3) includes a coil (3.1) and an armature (3.2) that is electromagnetically moved by the coil (3.1), and a portion of the leakage path (5) is formed between the coil (3.1) and the armature (3.2).

3. The electromechanical actuator (1) according to claim 2, wherein, The actuating device (3) has an electrode core (3.3) having at least one electrode core groove (3.5) on its radially outer surface (3.4), the electrode core groove forming part of the leakage path (5), wherein the electrode core groove (3.5) is particularly helical.

4. The electromechanical actuator (1) according to claim 3, wherein, The housing (2) has at least one housing recess (2.6) that forms part of the leakage path (5) and is particularly radially opposite to the core groove (3.5).

5. The electromechanical actuator (1) according to any one of the preceding claims, wherein, The outer end (5.2) of the leakage path (5) is formed by a through hole (2.5) in the housing (2), which is in fluid communication with the internal space (2.1) of the housing.

6. The electromechanical actuator (1) according to claim 5, wherein, At least a portion of the through hole (2.5) extends through the connector (2.3), and the controller of the actuator (3) can be connected to the connector (2.3).

7. The electromechanical actuator (1) according to claim 5 or claim 6, wherein, The through hole (2.5) has a fluid connector (2.4) that can be connected to a fluid supply device for checking the sealing performance of the seal (4).

8. The electromechanical actuator (1) according to any one of the preceding claims further includes a retaining bracket (6), the retaining bracket being configured to fix the actuating device (3) in the housing (2), wherein, The retaining bracket (6) is at least partially clearance-fitted with the actuating device (3) and / or has a recess (6.1) forming part of the leakage path (5).

9. An actuator-valve unit (100) comprising an electromechanical actuator (1) and a valve (101) according to any one of the preceding claims, wherein the valve (101) is connected to the leakage path (5) via the seal (4).

10. The actuator-valve unit (100) according to claim 9, wherein, The seal (4) is configured to seal the internal space (2.1) of the housing of the actuator (1) relative to the valve (101).

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