Mounting mechanism for expansion modules for pumps

Abstract

The invention relates to a device (1) comprising: a terminal box (2) for accommodating a pump control; an electronic expansion module (3) which expands the pump control by at least one additional function; and at least one locking element (11) for securely holding the module (3) at the terminal box (2). The locking element (11) is slidably received in a cavity (12). The locking element (11) has a resilient latch (13) on a first side (11b) for holding the locking element in a first position or a second position. The locking element (11) has at least one protruding rod (17, 18) on a second side (11c) to provide free passage for inserting the module (3) in the first position and to block the module (3) in the second position. The module (3) comprises at least one leg (20, 20a, 20b) extending from a base plate (7) and being insertable into the cavity (12) through an opening (21) when the locking element (11) is in the first position. The struts (20, 20a, 20b) have recesses (24) for engaging with the rods (17, 18) in a form-fitting manner when the locking element (11) is in the second position.

Description

Technical Field

[0001] The present invention relates to securing an electronics expansion module for the control electronics of a circulator pump to a junction box housing the pump electronics. More specifically, the invention relates to an arrangement comprising: a junction box for a centrifugal pump, the junction box housing the pump controls; an electronics expansion module that extends the pump controls by at least one additional hardware and / or software function; and at least one locking element for securely retaining the module to the junction box. The module is removably mounted to the junction box and has a pluggable electrical interface that extends from the underside of a base plate through an opening into the junction box for electrically connecting to the pump controls, thereby establishing a data link. Background Art

[0002] Modules for extending the functional scope of centrifugal pump control units are known. For example, the company WILO SE offers a function module for its centrifugal pump series called "Stratos", also known as an IF module (IF = interface), with the number 2097810, which expands the control electronics of the pump via the serial communication interface of BACnet in order to be able to connect the centrifugal pump to a building automation system. The IF module provides the electrical connection (here RS485) and the necessary communication protocol for connecting the pump to BACnet. WILO SE offers a similar function module under the part number 2097808, which enables a corresponding expansion of the pump via the industry standard MODBUS. The user can thus optionally supplement the centrifugal pump and specifically adapt it to his needs and the local communication infrastructure. The two function modules are plugged alternately into the same electrical interface of the centrifugal pump device.

[0003] Meeting current and future customer demands requires a continuous expansion of the functional scope of centrifugal pumps or their pump electronics, particularly with regard to wired or wireless communication interfaces. With the continuous development of existing communication technologies (e.g., mobile communications such as 2G (GSM) → 3G (UMTS) → 4G (LTE Advanced) → 5G; Bluetooth → Bluetooth Low Energy) and the addition of new technologies (ZigBee, enOcean, RFID), there is also a demand on the market for the rapid availability of functionally enhanced centrifugal pumps. This is difficult to meet, especially for radio-based communication technologies integrated in pump electronics, due to the necessary product development times and, in particular, the required product certifications. Furthermore, despite the increased functionality, cost-effectiveness is still desired.

[0004] The solution to meeting all of these requirements is to offer functions or groups of functions on a modular or building-block basis in the form of electronic expansion modules to supplement the main product, i.e., the centrifugal pump unit or its pump electronics. This reduces development time and the duration of time until market launch, as development can essentially be limited to the new electronic expansion module. Furthermore, recertification of the main product is not required, as certification is limited to the electronic expansion module. This means that new technologies can be combined with or integrated into the main product in a timely manner. Furthermore, since the expansion modules allow the main product to be equipped with specific functions or groups of functions in a targeted manner and on an "as-needed" basis, functions that are not required by the customer can be omitted from the main product, saving overall costs.

[0005] Considering that the size of future expansion modules is unpredictable, as it depends on the space occupied by the internal electronics, which in turn depends on the function or function groups provided by the module and the technology used to implement one or more functions, the modules should be arranged outside the pump's terminal box. This allows the size of the terminal box to be kept small.

[0006] However, externalizing functions or groups of functions into electronic expansion modules imposes certain requirements on the electrical interface between the electronic expansion modules and the pump electronics, as well as on the layout or installation of the expansion modules in the junction box. Among other considerations, operational safety, robustness, susceptibility to faults, contact protection, insulation, tightness, handling, and securing must be considered. Furthermore, a standardized mounting mechanism is required so that different expansion modules, particularly those of varying sizes, can be plugged into the same electrical interface of the pump electronics and easily and securely secured to the junction box in the same manner. Summary of the Invention

[0007] Therefore, one object of the present invention is to provide a mounting mechanism between a junction box of a pump and an electronic expansion module to meet the above needs.

[0008] This object is achieved by providing an arrangement according to the present invention. Advantageous further developments are described below.

[0009] According to the present invention, an apparatus is provided, comprising: a terminal box for a centrifugal pump, the terminal box being configured to house pump controls; an electronic expansion module, the electronic expansion module extending the pump controls with at least one additional hardware and / or software function; and at least one locking element for securely retaining the module in the terminal box. The module is removably mounted in the terminal box and has a pluggable electrical interface extending from the underside of a base plate through an opening into the terminal box for electrically connecting to the pump controls to establish a data link. The locking element is slidably received within a cavity and can be moved from a first position to a second position without tools, and from the second position to the first position with tools. The first position is an open position enabling insertion of the module into the terminal box, while the second position is a locked position preventing removal of the module.

[0010] Furthermore, the locking element has a resilient latch on a first side that engages a first recess in the terminal box to retain the locking element in a first position, or engages a second recess in the terminal box to retain the locking element in a second position. The locking element is configured to provide free access for insertion into the module in the first position, and to prevent the module from being inserted into the module in the second position by at least one protruding rod disposed on a second side of the locking element. The module includes at least one post extending from the base plate parallel to the electrical interface, and the post is insertable into the cavity through the opening when the locking element is in the first position, and the post has a recess that is configured to positively engage the rod when the locking element is in the second position.

[0011] In a preferred embodiment, the latch is arranged at the end of a resilient arm. In other words, during movement of the locking element, the resilient arm enables the latch to be removed from the first or second recess by pushing the arm backward. This arrangement is very simple, robust, and reliable. Preferably, the other end of the arm extends integrally into the central core of the locking element.

[0012] The module can include at least one strut on either side of the electrical interface, each strut having a recess for engaging a locking element. Furthermore, the device includes two locking elements, each having at least one corresponding lever. When the locking element is in the second position, the corresponding lever engages with the recess of the corresponding strut in a form-fitting manner, preventing the module from being removed again. This means that the expansion module is secured at two points, one on either side of the electrical interface. The two locking elements can be arranged symmetrically relative to the electrical interface.

[0013] In a further development, in addition to or as an alternative to the previous embodiment, the module comprises two consecutive struts, each having a recess, and the one or more locking elements comprise an overall longitudinal shape with two consecutive protruding rods, each of which engages in a form-fitting manner with one of the recesses of the consecutive struts in the second position. This means that the at least one locking element blocks the expansion module at two points. In the embodiment with two locking elements and twice as many consecutive struts (each having a corresponding recess), the expansion module is secured to the terminal box at four points. This embodiment is preferably used if the expansion module has a large housing.

[0014] Preferably, the latch comprises a leading forehead of rounded shape. This facilitates moving the locking element from the first position to the second position and pushes the arm backwards with little force.

[0015] In a preferred embodiment, the latch has a hook shape, the hook including a blocking surface that interacts with the front inner sidewall of the first recess to be retained by the first recess. Accordingly, the first recess may include a front inner sidewall configured to prevent the latch from moving out of the cavity. In other words, the inner sidewall is an abutment portion and, when the locking element moves from the second position to the first position, cooperates with the hook-shaped latch to limit movement of the locking element beyond the first position. Thus, the front inner sidewall of the first recess retains the latch within the first recess and, therefore, the locking element in the first position, preventing it from being inadvertently removed from the cavity or falling out.

[0016] In a further advantageous development, the first recess may include a rear inner sidewall configured to push the latch rearward during movement from the first position to the second position, more specifically at the start of said movement. Thus, when the locking element is pushed from the first position to the second position, the leading edge of the latch is pushed against the rear inner sidewall of the first recess. This deflects the force toward the locking element, resulting in an evasive movement of the latch due to the elasticity of the arm. As the locking element continues to move into the cavity, the latch slides along the rear inner sidewall, gradually pushing the latch rearward toward the core of the locking element, thereby bending the arm. As a result, the latch moves increasingly out of the first recess. Thus, the rear inner sidewall of the first recess facilitates easy movement of the locking element from the first position to the second position with minimal force. Preferably, the rear inner sidewall is flat and arranged at an oblique angle of less than 90° relative to the locking direction, i.e., relative to the movement of the locking element from the first position to the second position. For example, the angle may be between 30° and 60°, in particular approximately 45°.

[0017] In another advantageous further development, in addition to or as an alternative to the previously explained aspects, the second recess may include a front inner sidewall configured to push the latch backward during movement from the second position to the first position, more specifically at the start of said movement. Thus, when the locking element is pulled from the second position to the first position, the blocking surface of the latch is pushed against the front inner sidewall of the second recess, which deflects the force toward the locking element and, due to the elasticity of the arm, causes the latch to evade. As the locking element continues to move out of the cavity, the latch slides along the front inner sidewall, gradually pushing the latch backward toward the core of the locking element, thereby bending the arm. As a result, the latch moves increasingly out of the second recess. Thus, when pulled out of the cavity using a tool, the front inner sidewall of the second recess is able to move the locking element from the second position to the first position. Preferably, the front inner sidewall is flat and arranged at an angle of less than 90° relative to the unlocking direction, i.e., relative to the movement of the locking element from the second position to the first position. For example, the angle may be between 30° and 60°, in particular approximately 45°.

[0018] In the above description, "front" and "rear" refer to the direction of movement of the locking element when it moves from the first position to the second position. In this direction, the object designated as "rear" is arranged behind the object designated as "front".

[0019] In a preferred embodiment, the locking element has a longitudinal shape comprising a central core with at least one rod and a latch arranged on opposite sides of the central core. In other words, the central core is arranged between the protruding rod and the latch.

[0020] According to another aspect of the present invention, the underside of the central core of the locking element is slidably disposed within a guide rail at the bottom of the cavity. In other words, the guide rail delimits the cavity, supports the locking element, and helps retain it in place. Preferably, the guide rail is a shaped area of ​​the junction box that opens into the cavity. The central core can be positioned within the guide rail in a form-fitting manner. The central core can be disposed between the protruding rod and the latch.

[0021] In order to easily push and pull the locking element, the locking element can include a head at one axial end, which is formed by the end area of ​​the central core and the left and right flanks protruding from it on the opposite side. With the help of the flanks, the axial end of the central core is enlarged to form a sufficiently large operating surface to comfortably act on it, for example with the thumb. Of course, the central core can also have a cross-section that corresponds at least to the size of the operating surface along its entire axial length, but according to an embodiment of the present invention, this results in considerable material savings when manufacturing the locking element. In addition, the flanks allow a tool to be applied behind the head to act on the rear surface of the flanks, thereby pulling the locking element out of the cavity. The central core can be a central core that is slidably arranged in a guide rail and / or arranged between the protruding rod and the latch.

[0022] Preferably, the cavity opens onto an outer surface, in particular the front of the junction box, via a window, wherein the locking element protrudes from said outer surface in a first position, and the head of the locking element is located within the window in a second position. Thus, in the first position, the locking element is easily accessible and can be manually pushed into the cavity. Furthermore, in the second position, the locking element is securely stowed, i.e., no protruding parts can be injurious. Furthermore, for safety reasons, the device cannot be manually unlocked. The head of the locking element is preferably formed by an end region of a central core and left and right flanks protruding therefrom on opposite sides.

[0023] To facilitate the application of the tool, the window can have an extended area on one side to allow the flat end of the tool to be inserted into the space behind the side wings of the head. In other words, the window is larger than the head. This makes it possible to pry the locking element out of the cavity.

[0024] The invention further relates to a centrifugal pump having pump electronics and an expansion module which is plugged into the pump electronics and locked according to the invention.

[0025] As mentioned in the opening paragraph, there can be at least one first expansion module having a first housing size and at least one second expansion module having a second housing size, wherein the second housing size is larger than the first housing size. More specifically, the surface area of ​​the housing bottom of the first expansion module is larger than the surface area of ​​the housing bottom of the second expansion module. However, according to the present invention, the locking type of the first expansion module and the second expansion module are identical, so that the first expansion module or the second expansion module can be plugged into the pump electronics and locked in the same manner by pushing one or more locking elements from a first position to a second position. In other words, the spatial arrangement of the locking elements relative to the one or more struts is identical for the first expansion module and the second expansion module.

[0026] In a first example, the first expansion module may have two supports, while the second expansion module may have four. Preferably, the supports are arranged symmetrically with respect to the electrical interface. In this case, there will be four openings on the side of the junction box to insert the supports of the first and second expansion modules. Furthermore, there will be two locking elements, each with two protruding rods, to lock the first or second expansion module. However, since the first expansion module only has two supports, the second protruding rod of each locking element is ineffective. In another example, the mounting mechanism is formed by four supports on each of the first and second expansion modules and two locking elements on the side of the junction box. The supports can be arranged in or near the corners of the underside of the housing of the smaller first expansion module, while in the case of the second expansion module, due to its larger housing, at least two of the locking elements are set back from the corners of the underside of the housing. As can be seen, although the housings of the first and second expansion modules may be different, they are both suitable for the mounting mechanism according to the present invention.

[0027] Another object of the present invention is to provide a kit comprising at least a first expansion module and a second expansion module of the above-mentioned type, wherein the surface area of ​​the underside of the first expansion module is greater than the surface area of ​​the underside of the second expansion module, but in both expansion modules, the spatial arrangement of the electrical interface and the locking element relative to the electrical interface is the same.

[0028] Other objects, features, advantages, properties and effects of the present invention will become more apparent from the following detailed description of embodiments of the present invention when considered in conjunction with the accompanying drawings.

[0029] It should be noted that, in the context of this specification, the terms "have", "comprise", "comport" or "include" in no way exclude the presence of other features. Furthermore, the use of an indefinite article with an object does not exclude its plural form. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a front view of the apparatus showing an upper portion of a junction box and a lower portion of an expansion module mounted thereon in a locked state;

[0031] Figure 2 This is an exploded perspective view of the upper portion of the junction box and the lower portion of the expansion module before installation;

[0032] Figure 3 is an isometric view of the top of the junction box with the locking element unlocked;

[0033] Figure 4 This is an isometric view of the bottom of the expansion module;

[0034] Figure 5is an enlarged detail of the left side of the top of the terminal box with the locking element locked;

[0035] Figure 6 is a plan view of the left locking element;

[0036] Figure 7 is an isometric view of the top of the left locking element;

[0037] Figure 8 is an isometric view of the bottom of the left locking element;

[0038] Figure 9 is an isometric view of the left side of the left locking element;

[0039] Figure 10 is a front view of the left locking element;

[0040] Figure 11 Is in unlocked state Figure 1 An enlarged front view of the left side of the device, indicating section line JJ;

[0041] Figure 12 It is along Figure 11 The section line JJ in the unlocked state is intercepted based on Figure 1 An axially parallel cross-sectional view of the left side of the device;

[0042] Figure 13 Is in unlocked state Figure 1 An enlarged top view of the left side of the device of FIG. 1 , indicating section line HH;

[0043] Figure 14 It is along Figure 13 The section line HH in the unlocked state is intercepted according to Figure 1 A radial cross-sectional view of the left side of the device;

[0044] Figure 15 Is in a locked state based on Figure 1 An enlarged top view of the left side of the device of FIG. 1 , indicating section lines AA, BB, CC, and DD at different axial depths;

[0045] Figure 16 It is along Figure 15 The section line AA in the locked state is intercepted based on Figure 1 A radial cross-sectional view of the left side of the device;

[0046] Figure 17 It is along Figure 15 The section line BB in the locked state is intercepted according to Figure 1 A radial cross-sectional view of the left side of the device;

[0047] Figure 18It is along Figure 15 The basis of the locked state intercepted by the middle section line CC Figure 1 A radial cross-sectional view of the left side of the device;

[0048] Figure 19 It is along Figure 15 The section line DD in the locked state is intercepted according to Figure 1 A radial cross-sectional view of the left side of the device;

[0049] Figure 20 Is in a locked state based on Figure 1 An enlarged front view of the left side of the device, indicating the section lines EE, FF, and GG at different radial height positions;

[0050] Figure 21 It is along Figure 20 The section line EE in the locked state is intercepted based on Figure 1 An axially parallel cross-sectional view of the left side of the device;

[0051] Figure 22 It is along Figure 20 The section line FF in the locked state is intercepted according to Figure 1 An axially parallel cross-sectional view of the left side of the device, and

[0052] Figure 23 It is along Figure 20 The section line GG in the locked state is intercepted based on Figure 1 Axial parallel cross-section of the left side of the device.

[0053] Figure 24 and Figure 25 It is a simplified cross-sectional view.

[0054] Reference Signs List

[0055] 1 device

[0056] 2 Junction Box

[0057] 3 Expansion Modules

[0058] 4 Pump control electronics

[0059] 5 Expansion Module Electronics

[0060] 6 electrical interface sockets

[0061] 6a Electrical contacts of the electrical interface

[0062] 7 bottom plate

[0063] 8 Bottom side

[0064] 9 Shell opening

[0065] 10 Grooves

[0066] 11 Locking element

[0067] 11a Central core

[0068] 11b Left side of central core

[0069] 11c Right side of central core

[0070] 12 cavities

[0071] 13 Latch

[0072] 14 arms

[0073] 15 first recess

[0074] 16 Second recess

[0075] 17 front pole

[0076] 18 rear lever

[0077] 19 Freespace

[0078] 20 Pillars

[0079] 20a front pillar

[0080] 20b rear support

[0081] 21 Pillar opening

[0082] 22 Junction box / upper part of base frame

[0083] 23 External surface / front of junction box

[0084] 24 Notches in the Pillars

[0085] 25 Window

[0086] 26 Window extension area

[0087] 27 Sloped inner wall

[0088] 28 Free Space

[0089] 29 Head

[0090] 30 Junction box top surface

[0091] 31 Groove bottom

[0092] 32 base

[0093] 33 Rear inner wall of the second concave portion

[0094] 34 Anteromedial wall of the second recess

[0095] 35 Rear inner wall of the first concave portion

[0096] 36 Anteromedial wall of the first recess

[0097] 37 Washer

[0098] 38 Lip

[0099] 39 slots

[0100] 40 Residual hole

[0101] 41 screw receiving portion

[0102] 42 screw holes

[0103] 43 Direction indicators

[0104] 44 Position indicator

[0105] 45 Underside of central core / sliding surface

[0106] 46 Guidance Department

[0107] 47 Lower side of guide

[0108] 48 Right Wing

[0109] 49 Left Wing

[0110] 50 Left wing rear surface

[0111] 51 Back surface of first wing

[0112] 52 Free space for arm movement

[0113] 53 Arm base

[0114] 54 Insertion end

[0115] 55 Leading forehead / crown

[0116] 56 Tangential surface

[0117] 57 Blocking Surface

[0118] 58 Slanted Edge

[0119] 59 Lower bottom area of ​​the guide rail / cavity

[0120] 60 Raised bottom area of ​​cavity

[0121] 61 posterior wall

[0122] 62 Open bottom closure

[0123] 63 Lower bottom area of ​​the second recess

[0124] 64 inclined inner wall

[0125] Width in the X-direction

[0126] Y Depth in the vertical direction

[0127] Height in the Z lateral direction DETAILED DESCRIPTION

[0128] Figure 1 A front view of the device 1 is shown showing a first plug-in electronic expansion module 3 and a junction box 2, wherein the module 3 is removably mounted at the junction box 2. More specifically, Figure 1 Only the base plate 7 of the expansion module 3 and the upper portion 22 of the terminal box, which forms the base frame 22 of the mounting mechanism, are shown. Dashed lines indicate each of the housings of the module 3 and the terminal box 2. The terminal box 2 is part of a centrifugal pump (not shown) and houses a pump control 4 in its housing, which is used to control the speed of the pump and its electric motor, respectively. The electronic expansion module 3 also houses an electronic device 5 in its housing, which extends the pump control 4 with at least one additional hardware and / or software function. For example, the additional function provided is a wired bus or a Bluetooth interface. The device 1 also includes two locking elements 11 symmetrically arranged in the upper portion 22 of the terminal box 2, which are used to securely hold the module 3 to the terminal box in the locked state.

[0129] from Figure 2 As can be seen more clearly in FIG, the expansion module 3 has a pluggable electrical interface 6, 6a, which protrudes from the lower side 8 of the base plate 7 and extends into the terminal box 2 through the openings 9, 10 to electrically connect to the pump control 4, thereby establishing a data link. The electrical interface 6, 6a includes a socket 6 and an electrical contact 6a, as shown in FIG. Figure 1 As shown. Electrical contacts 6a protrude from the socket 6 and are electrically plugged into corresponding electrical contacts on the pump control 4 side. The electrical contacts 6a are in the form of electrical traces on a printed circuit board. The printed circuit board extends into the socket 6 through a slot 39 in the base plate 7.

[0130] The module 3 comprises two continuous pillars 20 located on either side of the electrical interfaces 6, 6a, the pillars 20 extending from the base plate 7 parallel to the electrical interfaces 6, 6a. At the top of the upper portion 22, there are four openings 21 corresponding to the arrangement of the pillars 20, i.e., there are two continuous openings 21 on either side of the openings 9, 10 for the electrical interfaces 6, 6a. Each of the two continuous openings 21 leads to a common cavity 12, so that there are two cavities 12 arranged on either side of the openings 9, 10 for the electrical interfaces 6, 6a. Figure 2As shown, when the locking element 11 is in a first position defining an unlocked state, the struts 20 can be inserted into the corresponding cavities 12 through the openings 21. Each strut 20 has a notch 24, giving the struts 20 an overall hook-shaped appearance. Each notch 24 opens to the side. More specifically, the notch 24 of the right consecutive strut 24 opens to the right, and the notch 24 of the left consecutive strut 24 opens to the left. When the locking element 11 is in a second position defining a locked state, the notch 24 functions to engage with the rod of the corresponding locking element 11 in a form-fitting manner.

[0131] Each locking element 11 is slidably received within a corresponding cavity 12. Cavity 12 combines two continuous openings 21 with a window 25 in the front face 23 of junction box 2. A locking element 11 has been inserted into the corresponding cavity 12 through the corresponding window 25, with the insertion end 54 facing forward. In the first position, the locking element 11 protrudes from the front face 23, allowing it to be pushed from the first position to the second position without tools, i.e., by hand, particularly with the thumb. In the second position, the head 29, which forms the axial end of the locking element 11, is located within the window 25, allowing the locking element 11 to be moved from the second position to the first position only with the use of a tool. This is achieved by inserting the flat end of a tool into the free space 28 behind the head 29 to pry the corresponding locking element 11 out of the cavity 12. To facilitate the use of a tool, the window 25 is enlarged at the sides of the free space 28 to form an extension region 26, whose side walls 27 are inclined to direct the flat end of the tool into the free space 28 behind the head 29.

[0132] from Figure 3 and Figure 4 As can be seen more clearly in FIG, the socket 6 is hollow, enclosing a slot 39 for a printed circuit board inside. The socket has a trapezoidal shape in cross section to prevent accidental or deliberate mis-installation of the module 3. At its base, the socket 6 widens to a base 32, on the outer circumference of which there is a gasket 37 comprising two parallel lips 38, as shown in FIG. Figure 2 In the mounted state of the module, the base 32 is housed in the groove 10 in the upper part 22 of the terminal box 2 and is sealed by the gasket 37 . Figure 3 An opening 9 leading to the interior of the terminal box 2 is shown in the bottom 31 of the groove 10. The outer shape of the opening 9 corresponds to the shape and size of the socket 6, so that a form-fit connection based on the "proofing" principle is formed.

[0133] Furthermore, the base plate 7 comprises holes 42 for screws as an alternative or additional mounting option for the expansion module. Corresponding screw receivers 41 are provided on the top of the terminal box 3.

[0134] And in Figure 2 In the case of pillar 20, no further explanation is given. Figure 3A distinction is made between front legs 20a and rear legs 20b as viewed from the front 23 of the junction box 2. The front legs 20a are close to the electrical interfaces 6, 6a and are substantially aligned with the socket 6, while the rear legs 20b are at a greater distance from the electrical interfaces 6, 6a. The rear legs 20b are also aligned with each other.

[0135] Figure 3 A free view into the cavity 12 is given through the opening 21, as the locking element 11 is in the first position, i.e. in the unlocked state. Figure 1 and Figure 2 As shown, the bottom area of ​​the cavity 12 aligned with the opening forms a bottom closure 62. Thus, the cavity 12 is completely closed to the interior of the junction box 2.

[0136] from Figure 1 、 Figure 2 and Figure 3 It can be seen that the device 1 is symmetrical with respect to the center of the front face 23 of the terminal box 2. In other words, the right side of the upper part 22 of the terminal box 3 is mirror-symmetrical to the left side. For this reason, only the left side will be explained in more detail below.

[0137] Figure 5 The locking element 11 is shown in a second position, i.e. in a locked state, so that it is completely accommodated in the cavity 12. An enlarged view of the cavity 12 and the functional areas 13, 14, 15, 16 of the locking element is also shown. Figure 5 Below, in conjunction with a more detailed view of the locking element 11, Figures 6 to 10 The left locking element 11 and its cooperation with the described functional areas 15 , 16 of the cavity 12 will be explained.

[0138] The locking element 11 is located on the first side 11b (see Figure 6 ) has a resilient latch 13 that engages with a first recess 15 of the terminal box 2 to hold the locking element 11 in the first position, or engages with a second recess 16 of the terminal box 2 to hold the locking element 11 in the second position. The first recess 15 and the second recess 16 form part of the cavity 12. The latch 13 is arranged at the end of a resilient arm 14 so that the resilient arm 14 can remove the latch 13 from the first recess 15 or the second recess 16 by pushing the arm backward during the movement of the locking element 11. Figures 6 to 9 It can be seen that the other end of the arm 14 extends to a root 53 which is formed integrally with the central core 11a of the locking element 11. The central core 11a extends along the entire axial length of the locking element 11 and forms the main part thereof. A free space 52 is provided between the arm 14 and the central core 11a, which allows the latch 13 and the arm 14, respectively, to be resiliently moved rearwardly towards the core 11a.

[0139] The latch 13 has a leading forehead 53 or crown that is rounded in shape. The forehead 53 continues to a tangential surface 56 that gradually moves away from the arm 14 and then bends to a blocking surface 57 that moves back toward the arm 14. The overall shape of the latch 13 is thus a duck head that acts like a hook. The blocking surface 57 of the latch 13 interacts with the front inner wall 36 of the first recess 15, which is flat and perpendicular to the direction of movement of the locking element 11, see Figure 5 , to retain the latch 13 within the first recess 15. Thus, the front inner sidewall 36 is an abutment and, in cooperation with the blocking surface 57, limits movement of the locking element 11 beyond the first position when the locking element 11 moves from the second position to the first position. In other words, the front inner sidewall 36 prevents the latch 13 from moving out of or falling out of the cavity 12.

[0140] The first recess 15 further comprises a rear inner sidewall 35 configured to push the latch 13 back onto the core 11a (into the free space 52) during the movement from the first position to the second position, more specifically at the beginning of said movement. Figure 5 As shown, the rear inner wall 35 is flat and arranged at an oblique angle of approximately 45° relative to the locking direction, i.e., relative to the movement of the locking element 11 from the first position to the second position. Therefore, when the locking element 11 is pushed from the first position to the second position, the leading forehead 55 of the latch 13 is pushed against the rear inner wall 35 of the first recess 15. This deflects the force toward the central core 11 of the locking element, resulting in an evasive movement of the latch 14 due to the elasticity of the arm 14. Next, as the locking element 11 gradually moves into the cavity 12, the latch 14 slides along the rear inner wall 35, pushing the latch 13 increasingly rearward against the core 11a of the locking element 11, thereby causing the arm 14 to bend. As a result, the latch 13 moves increasingly out of the first recess 15.

[0141] In a corresponding manner, the second recess 16, located behind the first recess, seen from the front 23 of the terminal box 2, comprises a front inner wall 34 and a rear inner wall 33. The shape of the rear inner wall 33 corresponds substantially to the shape of the leading rounded forehead 53 forming the end stop of the locking element 11. The front inner wall 34 is configured to push the latch 13 backwards during the movement of the latch 13 from the second position to the first position (more specifically at the beginning of said movement). Figure 5As shown, the front inner wall 34 is flat and arranged at an oblique angle of approximately 45° relative to the unlocking direction, i.e., relative to the movement of the locking element 11 from the second position to the first position. Therefore, when the locking element 11 is pulled from the second position to the first position, the blocking surface 57 of the latch 13 is pushed against the front inner wall 34 of the second recess 16. This deflects the force toward the central core 11a of the locking element 11. Due to the elasticity of the arm 14, this causes the latch 13 to evade. Subsequently, as the locking element 11 gradually moves out of the cavity 12, the latch 14 slides along the front inner wall 34, gradually pushing the latch 13 rearward toward the core 11a of the locking element 11, thereby bending the arm 14. As a result, the latch 13 moves increasingly out of the second recess 16.

[0142] In order to form the first recess 15 and the second recess 16 by injection molding, a core member that leaves a residual hole 40 in the top of the junction box 2 is used.

[0143] On the second side 11c (see Figure 6 ), that is, here opposite the first side 11b, the locking element 11 is configured to leave a free passage for installing the module 3 in the first position and for blocking the module 3 in the second position. Blocking the module 3 in the second position is achieved by two projecting locking rods 17, 18 spaced apart from each other, one rod 17, 18 being intended to engage with each of the two consecutive struts 20a, 20b.

[0144] from Figures 6 to 9 As can be seen, locking element 11 has an overall longitudinal shape. It comprises a central core 11a, on whose opposite sides 11b, 11c locking rods 17, 18 and latch 13 with arm 4 are arranged. In other words, central core 11a is positioned between protruding rods 17, 18 and latch 13. Central core 11a has a substantially rectangular cross-section. Rods 17, 18 protrude from central core 11a at opposite axial ends, forming a front rod 17 and a rear rod 18, defining a free space 19 therebetween. In a first position, free space 19 is aligned with front opening 21, allowing passage of front post 20a. In a second position, front rod 18 engages in recess 24 of front post 20a, and rear rod 17 engages in recess 24 of rear post 20b, thereby preventing posts 20a, 20b from being removed.

[0145] A first marking 43 and a second marking 44 are embossed on the combined top area of ​​the front rod 17 and the core. The first marking 43 is a direction indicator 43, in this example a triangle, which indicates the direction of movement of the locking element 11 for locking the module 3. The second marking 44 is a position indicator 44, in this example in the form of a rod, which indicates the position of the locking element 11. This helps to verify whether the locking element 11 has correctly reached the first position for extracting the module.

[0146] The underside 45 of the central core 11a of the locking element 11 forms a sliding surface. Said underside 45 is slidingly arranged in a guide rail 59 at the bottom of the cavity 12, as shown in FIG. Figure 14 and Figures 16 to 19 The guide rail 59 is a flat surface that delimits the cavity 12, supports the locking element 11 and helps to keep the locking element 11 in place. The central core 11a is located in the guide rail 59 in a form-fitting manner.

[0147] At the front axial end, the head 29 of the locking element 11 is formed by the end region of the central core 11a, a left wing 49, and a right wing 48. The wing 48, 49 protrudes from the central core 11a on opposite sides, thereby widening the axial surface of the central core 11a, forming an operating surface that is comfortable for use, for example, with a thumb. A free space 28 is provided between the left wing 49 and the base 53 of the arm 14, allowing the flat end of a tool to be positioned behind the left wing 49 and act on its rear surface 50 to pry the locking element 50 out of the cavity 12. To this end, the tool rests on the inclined inner wall of the window extension area 26, while the flat end of the tool applies a thrust against the rear surface, pulling the locking element out of the cavity. The rear surface 50 is inclined in the locking direction, allowing the flat end of the tool to make flat contact.

[0148] The rear surface 51 of the right side flap 48 is parallel to the front face 29 of the head. The rear surface 51 contacts the right side rear wall 61 in the second position. Figures 21 to 23 There is space for accommodating the right side wing 49 in front of the right side rear wall 61 .

[0149] A guide portion 46 projects from the central core 11a on the side 11b opposite the rear rod 18. The guide portion 46 guides the rear end of the locking element 11. The lower side 47 of the guide portion 46 is set back compared to the lower side 45 of the central core element 11a, so that only the lower side 45 of the central core element 11a is enclosed in the guide track 59.

[0150] like Figure 7 、 Figure 9 and Figure 10 As shown, the endmost edge 58 of the latch 13 is inclined because the top surface extends beyond the bottom surface. Accordingly, the portion of the inner wall 64 of the second recess 16 facing the inclined edge 58 of the latch (see FIG. Figure 5 ) is also tilted, such as Figure 18 shown.

[0151] Figures 11 to 23 A more detailed view of the mounting mechanism according to the invention is given using axial and radial cross-sections through the device 1, wherein Figures 11 to 14 Involving unlocked state, Figures 15 to 23 Involves a locked state.

[0152] Figure 11 Designated is a line JJ which defines a horizontal section at a height Z passing through the pillars 20 a , 20 b below the notch 24 . Figure 12 The corresponding cross-sectional view along the JJ line is given.

[0153] exist Figure 12 In the embodiment, when the locking element is in the first position, partially extending into the cavity 12 and partially protruding from the front 23 of the terminal box 2, the rear of the cavity 12 is visible and the upper part 22 of the terminal box 2 is in the Figure 12 The upper portion forms the base frame. The cavity 12 is arranged in the base frame. The latch 13 engages with the first recess 15. At the rear of the cavity 12, the linear guide 59 and the raised bottom area 60 of the support guide 46 of the cavity 12 can be seen.

[0154] Figure 13 Designated is a line HH that defines a vertical section at a depth Y passing centrally through the front buttress 20a. Figure 14 The corresponding cross-sectional view along line HH is given.

[0155] exist Figure 14 In FIG, it can be seen that the guide rail 59 adjoins the central core 11a at its bottom and forms the lowest region of the cavity 12. Next to the guide rail 59, there is an elevated bottom region 60 which also supports the arm 14. Figure 14 In the unlocked state shown, no physical part engages with the recess 24, as the free space 19 coincides with the recess 24, leaving the lateral face of the rear bar 18 between the front and rear pillars 20a, 20b free to view, as shown. Figure 13 Indicated by the dotted line.

[0156] Figure 15 Shows the locked state of the device 1, specifying

[0157] - a first line AA defining a vertical section at a depth Y passing centrally through the front pillar 20 a;

[0158] a second line BB defining a vertical section at a depth Y between the first recess 15 and the second recess 16 and between the front support 20 a and the rear support 20 b ;

[0159] a third line CC defining a vertical section passing centrally through the second recess 16 at a depth Y, and

[0160] a fourth line DD defining a vertical section at a depth Y passing centrally through the rear pillar 20a,

[0161] Figure 16 A cross-sectional view along the first line AA is given, Figure 17 A cross-sectional view along the second line BB is given, Figure 18 A cross-sectional view along the third line CC is given, Figure 19 A cross-sectional view along a fourth line DD is given.

[0162] from Figure 16 It can be seen that in the second position of the locking element 11, i.e. the locked state, the front rod 17 engages the notch 24 of the front support 20a. Figure 19 As shown, the rear bar 18 engages the notch 24 of the rear support 20b. Figure 17 and Figure 18 As shown, the cavity 12 includes side compartments for the locking rods 17, 18, which extend parallel to the central core 11a and are aligned with the recesses 24 in the struts 20a, 20b. Figure 17 and Figure 18 In the embodiment, the free space 19 coincides with the side compartments.

[0163] In addition, Figure 18 In the drawing, the latch 13 can be seen engaging the second recess 16. The bottom area 63 of the second recess 16 is lower than the raised bottom area 60 of the support guide 47 of the cavity 12 and higher than the bottom area of ​​the guide rail 59. This has the advantage that small particles that may fall through the residual hole 40 of the second cavity are collected at the lower bottom area 63 and do not block the engagement of the latch 13 with the second recess 16.

[0164] Figure 20 Also shown is the locked state of the device 1, specifying

[0165] a first line EE defining a horizontal section at a height Z passing through the guide rail 59 of the pillars 20 a , 20 b below the notch 24 ;

[0166] a second line FF defining a horizontal section at a height Z passing through the pillars 20a, 20b below the cutout 24, and

[0167] - A third line GG which defines a horizontal section at a height Z passing through the pillars 20a, 20b and their notches.

[0168] Figure 21 A cross-sectional view along the first line EE is given, Figure 22 A cross-sectional view along the second line FF is given, Figure 23 A cross-sectional view along the third line GG is given.

[0169] Joint consideration Figure 21 、 Figure 22 and Figure 23 , we can see that in the lower part of the cavity ( Figure 21 ) and the middle ( Figure 22 ) region, there is no interaction between the locking element 11 and the columns 20a, 20b. Figure 23 As can be seen in FIG, there is an interaction in the upper region of cavity 12 where locking bars 17 , 18 engage with notches 24 of the posts, thereby blocking posts 20 a , 20 b and preventing module 3 from being removed from junction box 2 .

[0170] exist Figure 24 and Figure 25 A simplified radial cross-section of the locking element 11 and the surrounding base frame 22 is shown in FIG. 1 in order to explain the function of the different outer surfaces or surface portions of the locking element 11 . Figure 25 Corresponding to Figure 19 The cutting DD in Figure 24 A radial cut is shown immediately behind the strut 20b. The cross-sectional profile of the locking element 11 is defined by rectangular or mutually parallel surface areas P, Q, R, S, T, U, V, W and X. Figure 24 In the embodiment, the surface areas WTQ prevent the locking element 11 from rotating in the clockwise direction, as they oppose said direction. The surface areas PSV prevent the locking element 11 from rotating in the counterclockwise direction, as they oppose said direction. The surface areas PQ form a strong end stop that resists the pulling action of the module. Figure 25 , only surface area TQ opposes clockwise rotation of locking element 11, while surface area W forms a strong end stop in front of the lower section of pillar 20b located below notch 24. Furthermore, only surface area S opposes counterclockwise rotation of locking element 11, since surface areas P and V have no effect. Finally, only surface area Q forms a strong end stop against the module pulling action, since surface area P is not in front of anything when facing opening 21.

[0171] In summary, the specific features of the mounting mechanism according to the present invention are as follows:

[0172] The concept is based on the cooperation of a male and a female part, wherein when the male part engages the female part, the device 1 is locked, and when the male and female parts are disengaged, the device 1 is unlocked.

[0173] The male part is formed by a locking element 11 sliding inside the female part.

[0174] The female part is formed on the one hand by a base 22 surrounding the cavity 12 and on the other hand by a removable notched support 20 a of the hook type.

[0175] The presence or absence of the locking bars 17, 18 within the recesses 24 of the struts 20a, 20b provides functionality.

[0176] The locked position is given by the spring effect of the arm 14 and the friction between the locking element 11 and the base frame 22 .

[0177] Movement between the first and second positions is facilitated by the 45° inclined inner walls 34 , 35 of the first and second recesses 15 , 16 , making it possible for the latch 13 to slide and snap into the respective first or second recess 15 , 16 .

[0178] The unlocked position is defined by the blocking surface 57 of the latch 13 and the inner wall 36 of the first recess 15, both being angled at 90 degrees relative to the direction of movement of the locking element.

[0179] The inner wall 36 forms an end stop for the latch 13 and prevents the locking element 11 from moving in the open position.

[0180] All inner walls 34 , 35 , 36 having a specific function are part of the base frame 22 .

[0181] It should be noted that the foregoing description is given for illustrative purposes only and in no way limits the scope of protection of the present invention. Features of the present invention indicated as "may", "can", "exemplary", "preferred", "optional", "ideal", "advantageous" or "suitable" are considered to be entirely optional and, likewise, do not limit the scope of protection, which is defined solely by the claims. To the extent that the foregoing description describes elements, components, process steps, values ​​or information that have known, obvious or foreseeable equivalents, these equivalents are encompassed by the present invention. Similarly, the present invention includes any changes, variations or modifications to the embodiments, as long as the basic idea of ​​the present invention is maintained, regardless of whether the changes, variations or modifications result in improvements or deteriorations of the embodiments, the purpose of these changes, variations or modifications is to replace, add, change or omit elements, components, process steps, values ​​or information.

[0182] Although the foregoing description of the present invention has mentioned various physical, non-physical, or process features associated with one or more specific embodiments, these features may also be used in isolation from the specific embodiments, at least to the extent that they do not require the presence of other features. Rather, these features mentioned with respect to one or more specific embodiments may be combined with each other as desired, as well as with further disclosed or undisclosed features of the embodiments shown or not shown, at least to the extent that these features do not exclude each other or result in technical incompatibilities.

Claims

1. A device (1), comprising: A terminal box (2) for a centrifugal pump, the terminal box housing pump controls and providing a cavity (12), an electronic expansion module (3) which expands the pump control by at least one additional hardware and / or software function and has a base plate (7), and at least one locking element (11) for securely holding the electronic expansion module (3) at the junction box (2), The electronic expansion module (3) is removably mounted on the junction box (2) and has a pluggable electrical interface (6, 6a) extending from the lower side (8) of the base plate (7) through openings (9, 10) into the junction box (2) to electrically connect the pump control (4) for establishing a data link. Characterized in that the locking element (11) is slidably received in the cavity (12) and can be moved from a first position to a second position without a tool and from the second position to the first position by a tool, The locking element (11) has a resilient latch (13) on a first side (11b), the resilient latch engaging with a first recess (15) at the junction box (2) to hold the locking element (11) in the first position, or the resilient latch engaging with a second recess (16) at the junction box (2) to hold the locking element (11) in the second position, The locking element (11) is further configured to provide a free passage for plugging the electronic expansion module (3) in the first position and to block the electronic expansion module (3) in the second position by at least one protruding rod (17, 18) arranged on a second side (11c) of the locking element (11), and The electronic expansion module (3) comprises at least one pillar (20, 20a, 20b) extending from the base plate (7) parallel to the electrical interface (6, 6a), and when the locking element (11) is in the first position, the pillar (20, 20a, 20b) can be inserted into the cavity (12) through the opening (21), and the pillar (20, 20a, 20b) has a recess (24), and when the locking element (11) is in the second position, the recess (24) is used to engage with the protruding rod (17, 18) in a form-fitting manner.

2. The device (1) according to claim 1, characterized in that The elastic latch (13) is arranged at the end of the elastic arm (14).

3. The device (1) according to claim 1 or 2, characterized in that The electronic expansion module (3) comprises at least one pillar (20, 20a, 20b) on both sides of the electrical interface (6), each pillar having a recess (24), and the device (1) further comprises two locking elements (11), each locking element having at least one corresponding protruding rod (17, 18), and when the locking element (11) is in the second position, the corresponding protruding rod (17, 18) engages with the recess (24) of the corresponding pillar (20, 20a, 20b) in a form-fitting manner.

4. The device (1) according to claim 1 or 2, characterized in that The electronic expansion module (3) comprises two continuous pillars (20a, 20b), each having a notch (24), and the locking element (11) comprises a general longitudinal shape with two continuous protruding bars (17, 18), each of which engages in a form-fitting manner with one of the notches (24) of the pillars (20a, 20b) in the second position.

5. The device (1) according to claim 1 or 2, characterized in that The elastic latch (13) comprises a leading forehead (55) of rounded shape.

6. The device (1) according to claim 1 or 2, characterized in that The elastic latch (13) has the shape of a hook comprising a blocking surface (57) interacting with a first front inner side wall (36) of the first recess (15) so as to be retained by the first recess (15).

7. The device (1) according to claim 1 or 2, characterized in that The first recess (15) includes a first front inner sidewall (36) configured to prevent the resilient latch (13) from moving out of the cavity (12) to retain the resilient latch in the first position.

8. The device (1) according to claim 1 or 2, characterized in that The first recess (15) includes a rear inner sidewall (35) configured to urge the resilient latch (13) rearward during movement from the first position to the second position.

9. The device (1) according to claim 1 or 2, characterized in that The second recess (16) includes a second front inner sidewall (34) configured to urge the resilient latch (13) rearward during movement from the second position to the first position.

10. The device (1) according to claim 1 or 2, characterized in that The locking element (11) has a longitudinal shape comprising a central core (11a), on opposite sides (11b, 11c) of which the at least one protruding rod (17, 18) and the resilient latch (13) are arranged.

11. The device (1) according to claim 1 or 2, characterized in that The underside (45) of the central core (11a) of the locking element (11) is slidingly arranged in a guide rail (59) at the bottom of the cavity (12).

12. The device (1) according to claim 1 or 2, characterized in that The locking element (11) comprises at one axial end a head (29) formed by an end region of a central core (11a) and left and right wings (48, 49) projecting from the central core on opposite sides (11b, 11c).

13. The device (1) according to claim 1 or 2, characterized in that The cavity (12) opens to an outer surface, i.e., to the front of the junction box (2), via a window (25), wherein the locking element (11) protrudes from the outer surface in the first position and, in the second position, the head (29) of the locking element (11) is located in the window (25).

14. The device (1) according to claim 13, characterized in that The window (25) has an extended area (26) on one side to allow the flat end of the tool to be inserted into the space (28) behind the flanks (49) of the head (29) to pry the locking element (11) out of the cavity (12).

Images