Constant-temperature oscillating metal bath

Abstract

The utility model provides a constant-temperature oscillation metal bath which comprises a metal bath machine body, an oscillation main driving mechanism, a heat-conducting oscillation disc and a carrier module, a working cavity is formed in the top surface of the metal bath machine body; the oscillation main driving mechanism is arranged in the metal bath machine body and is provided with a rotary oscillation output end extending into the working cavity; the heat-conducting oscillation disc is arranged in the working cavity and connected to the rotary oscillation output end, an electric heating piece is arranged in the heat-conducting oscillation disc, and the electric heating piece is controlled by the controller and used for keeping the heat-conducting oscillation disc at a constant preset temperature; the carrier module is detachably connected to the heat-conducting oscillation disc, and a test tube hole array is distributed on the carrier module in an array manner; an oscillation auxiliary assembly is arranged between the peripheral wall of the heat conduction oscillation disc and the cavity wall of the working cavity, and the oscillation auxiliary assembly is used for applying oscillation coupling force to the heat conduction oscillation disc. According to the constant-temperature oscillation metal bath provided by the utility model, the oscillation effect of the metal bath can be improved, so that the mixing uniformity of sample components is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal baths, and in particular relates to a constant temperature oscillating metal bath. Background Art

[0002] Compared with water baths, metal baths have higher heating temperatures and speeds. Therefore, metal baths have gradually replaced conventional water baths in the market and are widely used in the preservation of samples of various analytical instruments, the preservation and reaction of various enzymes, the denaturation of nucleic acids and proteins, serum coagulation and other industries.

[0003] To ensure thorough mixing of sample components in test tubes, more and more metal baths are being equipped with oscillation functions. Specifically, these oscillations mostly involve a drive motor driving an oscillating disk through an eccentric wheel to create a rotary oscillating motion. However, this method suffers from the fact that the oscillating disk always rotates at a constant speed. Thus, while nominally an oscillating motion, it is actually just a rotary motion lacking effective oscillation. Therefore, existing products that simply pursue high rotational speeds to enhance oscillation effects cannot achieve the desired results, necessitating a change in thinking to find a better solution. Utility Model Content

[0004] The embodiment of the present utility model provides a constant temperature oscillating metal bath, which aims to improve the oscillation effect of the metal bath and further improve the mixing uniformity of sample components.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide a constant temperature oscillating metal bath, comprising:

[0006] The metal bath body has a top surface provided with a downwardly concave working chamber, and a controller is arranged inside the metal bath body;

[0007] An oscillating main drive mechanism is provided inside the metal bath body and is electrically connected to the controller. The oscillating main drive mechanism has a rotary oscillating output end extending upward into the working chamber.

[0008] A heat-conducting oscillation disk is disposed in the working chamber and connected to the rotary oscillation output end. An electric heating element is provided inside the heat-conducting oscillation disk. The electric heating element is controlled by a controller and is used to keep the heat-conducting oscillation disk at a constant preset temperature.

[0009] The carrier module is detachably connected to the heat-conducting oscillating plate, and an array of test tube holes is distributed on the carrier module;

[0010] An oscillation auxiliary component is provided between the peripheral wall of the heat-conducting oscillation disk and the cavity wall of the working cavity, and the oscillation auxiliary component is used to apply an oscillation coupling force to the heat-conducting oscillation disk.

[0011] In one possible implementation, the oscillation auxiliary component includes:

[0012] A plurality of first magnetic steels are sequentially spaced and distributed along the circumferential wall of the working chamber;

[0013] A plurality of second magnetic steels are distributed at intervals on the peripheral wall of the heat-conducting oscillation disk and are coupled with respective first magnetic steels to generate oscillation coupling forces.

[0014] In some embodiments, the rotary oscillation output end is provided with an elastic coupling, and the heat-conducting oscillation disk is connected to the rotary oscillation output end via the elastic coupling.

[0015] Exemplarily, the oscillating main drive mechanism includes:

[0016] The driving motor is fixedly connected to the metal bath body and electrically connected to the controller;

[0017] An eccentric transmission member, one end of which is connected to the output end of the driving motor, and the other end of which penetrates the working chamber and forms a rotary oscillation output end;

[0018] Multiple crankshafts are distributed in an array in the working chamber, and one end of each crankshaft is rotatably connected to the bottom wall of the working chamber, and the other end is rotatably connected to the bottom wall of the heat-conducting oscillation disk. The eccentricity of the crankshaft and the eccentric transmission member is consistent.

[0019] For example, a rotating track hole is opened in the center of the bottom wall of the working chamber; the eccentric transmission member includes an eccentric disk, a first shaft section connected to one side of the eccentric disk and offset from the center of the eccentric disk, and a second shaft section connected to the center of the other side of the eccentric disk; wherein, the eccentric disk rolls on the hole wall of the rotating track hole, the first shaft section is fixedly connected to the output end of the driving motor, and the second shaft section is rotatably connected to the heat-conducting oscillation disk as a rotating oscillation output end.

[0020] In a possible implementation, a plurality of rollers are spaced apart along the circumference of the eccentric disk at an edge away from the first shaft section, and each roller rolls on the hole wall of the rotary track hole.

[0021] In some embodiments, a plurality of ring platforms are sequentially arranged around the edge of the top wall of the heat-conducting oscillating plate, and a plurality of ring grooves are respectively provided on the bottom wall of the carrier module for embedding the ring platforms.

[0022] Exemplarily, at least two opposite side walls of the thermal oscillation plate are provided with upwardly extending claws, and at least two opposite side walls of the carrier module are provided with slots, and each claw is respectively inserted into each slot and engaged with the slot up and down.

[0023] For example, a wedge-shaped buckle is provided at the top of the claw, and a clamping platform suitable for clamping the buckle is provided on the groove wall of the groove. A stripper plate is slidably connected in the groove, and the stripper plate is used to push the wedge surface of the buckle downward to disengage the buckle from the clamping platform.

[0024] In some embodiments, a control panel is embedded on one side of the working chamber of the metal bath body, and the control panel is electrically connected to the controller.

[0025] The beneficial effects of the constant temperature oscillating metal bath provided by the utility model are as follows: compared with the prior art, the constant temperature oscillating metal bath of the utility model can control the electric heating element to heat the heat-conducting oscillation disk and maintain the heat-conducting oscillation disk at a constant preset temperature through a controller, so that the carrier module installed on the heat-conducting oscillation disk is heated and kept at a constant temperature, and the sample can be placed in a test tube and inserted into the test tube hole array; on this basis, the heat-conducting oscillation disk can be driven to perform a rotational oscillation motion through the oscillation main drive mechanism, and an oscillation auxiliary component is used to apply an oscillation coupling force to the heat-conducting oscillation disk. Since the heat-conducting oscillation disk and the rotary oscillation output end are elastically connected, the heat-conducting oscillation disk will produce a rotational oscillation due to the interference of the oscillation coupling force, so that the carrier module connected to the heat-conducting oscillation disk can also generate a circumferential motion oscillation while rotating, thereby improving the oscillation effect and further improving the mixing uniformity of the sample components. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the three-dimensional structure of a constant temperature oscillating metal bath provided in an embodiment of the present utility model;

[0027] Figure 2 A schematic cross-sectional view of a constant temperature oscillating metal bath provided by an embodiment of the present invention along the central axis of its working chamber;

[0028] Figure 3 for Figure 2 Schematic diagram of the local enlarged structure at A in the middle;

[0029] Figure 4 A schematic diagram of the three-dimensional structure of the eccentric transmission member used in the embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of the three-dimensional structure of the heat-conducting oscillating disk used in an embodiment of the present utility model.

[0031] In the figure: 10, metal bath body; 100, working chamber; 101, rotary track hole; 20, oscillation main drive mechanism; 21, drive motor; 22, eccentric transmission member; 221, eccentric disk; 222, first shaft section; 223, second shaft section; 224, roller; 23, crankshaft; 30, heat-conducting oscillation disk; 31, ring table; 32, clamping claw; 321, buckle; 33, electric heating element; 40, carrier module; 400, test tube hole array; 41, ring groove; 42, clamping groove; 421, clamping table; 422, stripper plate; 50, oscillation auxiliary component; 51, first magnetic steel; 52, second magnetic steel; 60, elastic coupling; 70, control panel. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] It should be noted that when an element is referred to as being "disposed on" or "connected to" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0034] Please also refer to Figures 1 to 5 Now, the constant temperature oscillating metal bath provided by the present invention is described. The constant temperature oscillating metal bath comprises a metal bath body 10, an oscillating main drive mechanism 20, a heat-conducting oscillating disk 30, and a carrier module 40. The top surface of the metal bath body 10 is provided with a downwardly recessed working chamber 100, and the metal bath body 10 is provided with a controller. The oscillating main drive mechanism 20 is provided inside the metal bath body 10 and is electrically connected to the controller. The oscillating main drive mechanism 20 has a rotary oscillation output end extending upward into the working chamber 100. The heat-conducting oscillating disk 30 is provided in the working chamber 100 and is connected to the rotary oscillation output end. An electric heater 33 is provided inside the heat-conducting oscillating disk 30. The electric heater 33 is controlled by the controller and is used to maintain a constant preset temperature of the heat-conducting oscillating disk 30. The carrier module 40 is detachably connected to the heat-conducting oscillating disk 30. An array of test tube holes 400 is distributed on the carrier module 40. An oscillation auxiliary component 50 is provided between the peripheral wall of the heat-conducting oscillating disk 30 and the cavity wall of the working chamber 100. The oscillation auxiliary component 50 is used to apply an oscillating coupling force to the heat-conducting oscillating disk 30.

[0035] It should be noted that, in this embodiment, the oscillation main drive mechanism 20 can be based on the eccentric rotational motion to drive the heat-conducting oscillation disk 30 to perform rotary oscillation motion. The heat-conducting oscillation disk 30 can be made of all-aluminum material, and the electric heating element 33 arranged inside it can be specifically an electromagnetic heating element or a resistance heating element. The carrier module 40 is the same as the modules commonly used in the industry, and is all made of all-aluminum material with good thermal conductivity. Considering that the heat-conducting oscillation disk 30 performs rotary oscillation motion in the working chamber 100, there is a movement gap between the heat-conducting oscillation disk 30 and the cavity wall of the working chamber 100. On this basis, an oscillation auxiliary component 50 is set up by utilizing the motion gap. Specifically, it can be a plurality of groups of magnetic suction parts that attract or repel each other to generate magnetic coupling force on the heat-conducting oscillation disk 30, or it can be a plurality of groups of elastic connecting parts that cooperate with each other to generate elastic coupling force on the oscillation auxiliary component 50. The magnetic coupling force or the elastic coupling force is used to make the heat-conducting oscillation disk 30 receive different coupling forces when it rotates to different positions. In this way, the heat-conducting oscillation disk 30 can form an oscillating motion form that is sometimes fast and sometimes slow, which can greatly improve the oscillation effect compared with the uniform rotation method.

[0036] Compared with the prior art, the constant temperature oscillating metal bath provided in this embodiment can control the electric heating element 33 to heat the heat-conducting oscillation disk 30 and maintain the heat-conducting oscillation disk 30 at a constant preset temperature through the controller, so that the carrier module 40 installed on the heat-conducting oscillation disk 30 is heated and maintained at a constant temperature, and the sample is placed in a test tube and inserted into the test tube hole array 400; on this basis, the heat-conducting oscillation disk 30 can be driven to perform a rotational oscillation motion through the oscillation main drive mechanism 20, and an oscillation auxiliary component 50 is used to apply an oscillation coupling force to the heat-conducting oscillation disk 30. Since the heat-conducting oscillation disk 30 is elastically connected to the rotary oscillation output end, the heat-conducting oscillation disk 30 will produce a rotational oscillation due to the interference of the oscillation coupling force, so that the carrier module 40 connected to the heat-conducting oscillation disk 30 can also generate a circumferential motion oscillation while rotating, thereby improving the oscillation effect and further improving the mixing uniformity of the sample components.

[0037] In some embodiments, see Figure 2 and Figure 5 The oscillation auxiliary component 50 includes a plurality of first magnetic steels 51 and a plurality of second magnetic steels 52; wherein, each first magnetic steel 51 is distributed in sequence along the cavity wall of the working chamber 100; and a plurality of second magnetic steels 52 are distributed in sequence along the cavity wall of the heat-conducting oscillation disk 30, and are coupled with each first magnetic steel 51 to generate an oscillation coupling force.

[0038] It should be noted that the above-mentioned heat-conducting oscillation disk 30 adopts a polygonal disk body such as a rectangular disk body, and the working chamber 100 adopts a polygonal cavity that matches the shape of the heat-conducting oscillation disk 30. On this basis, a group of first magnetic steels 51 are set on each cavity wall of the working chamber 100, and a group of second magnetic steels 52 are set on each circumferential wall surface of the heat-conducting oscillation disk 30, thereby forming a corresponding coupled adsorption or coupled repulsion state between each group of first magnetic steels 51 and each group of second magnetic steels 52. During the rotational movement of the heat-conducting oscillation disk 30, due to the frequent misalignment of the corresponding first magnetic steels 51 and the second magnetic steels 52, alternating changes in magnetic attraction or magnetic repulsion are generated, so that the peripheral wall of the heat-conducting oscillation disk 30 obtains a continuously changing resultant force, thereby driving the heat-conducting oscillation disk 30 to oscillate continuously during the rotation process, thereby improving the oscillation mixing effect.

[0039] For some possible implementations, see Figure 2 The rotary oscillation output end is provided with an elastic coupling 60, connecting the heat-conducting oscillation disk 30 to the rotary oscillation output end via the elastic coupling 60. The elastic coupling 60 herein refers to a coupling capable of transmitting torque deviation. Specifically, it can be understood as connecting two half-shafts using an elastic member, whereby a rotational angle deviation can be generated between the two half-shafts due to deformation of the elastic member. The elastic coupling 60 can be used to generate an angular deviation between the heat-conducting oscillation disk 30 and the rotary oscillation output end. This allows the oscillating coupling force exerted on the heat-conducting oscillation disk 30 by the oscillation auxiliary assembly 50 to drive the heat-conducting oscillation disk 30 into rotary oscillation, thereby promoting thorough mixing of the sample product.

[0040] As a specific embodiment of the above-mentioned oscillating main drive mechanism 20, please refer to Figure 2 The oscillation main drive mechanism 20 includes a drive motor 21, an eccentric transmission member 22 and a plurality of crankshafts 23; wherein the drive motor 21 is fixedly connected to the metal bath body 10 and is electrically connected to the controller; one end of the eccentric transmission member 22 is connected to the output end of the drive motor 21, and the other end penetrates into the working chamber 100 and forms a rotary oscillation output end; a plurality of crankshafts 23 are arrayed in the working chamber 100, and one end of each crankshaft 23 is rotatably connected to the bottom wall of the working chamber 100, and the other end is rotatably connected to the bottom wall of the heat-conducting oscillation disk 30, and the eccentricity of the crankshaft 23 and the eccentric transmission member 22 is consistent.

[0041] The driving motor 21 drives the eccentric transmission member 22 to rotate, and then drives the heat-conducting oscillation disk 30 to rotate through the eccentric transmission member 22. On this basis, each crankshaft 23 is used to support the edge position of the heat-conducting oscillation disk 30, thereby improving the stability of the heat-conducting oscillation disk 30.

[0042] In some embodiments, combined Figure 2 and Figure 4It is understood that a rotary track hole 101 is opened at the center of the bottom wall of the above-mentioned working chamber 100; the eccentric transmission member 22 includes an eccentric disk 221, a first shaft section 222 connected to one side of the eccentric disk 221 and deviated from the center of the eccentric disk 221, and a second shaft section 223 connected to the center of the other side of the eccentric disk 221; wherein, the eccentric disk 221 rolls on the hole wall of the rotary track hole 101, the first shaft section 222 is fixedly connected to the output end of the drive motor 21, and the second shaft section 223 is rotatably connected to the heat-conducting oscillation disk 30 as a rotary oscillation output end.

[0043] The rotary track hole 101 cooperates with the eccentric disk 221 to provide radial support for the eccentric transmission member 22, thereby preventing the eccentric transmission member 22 from radially shaking and affecting the stability of the thermal oscillation disk 30, and further preventing the thermal oscillation disk 30 from vibrating up and down and causing the carrier module 40 to fall off.

[0044] Please note that, see Figure 4 A plurality of rollers 224 are arranged at intervals along the circumference of the eccentric disk 221, away from the first shaft section 222. Each roller 224 rolls against the wall of the rotating track hole 101. The rollers 224 may be rolling bearings. The use of the rollers 224 rolling against the wall of the rotating track hole 101 can reduce frictional resistance, thereby improving the ease and stability of the rotation of the eccentric transmission member 22.

[0045] For some examples, see Figure 3 and Figure 5 The top edge of the heat-conducting oscillating plate 30 is formed with a plurality of annular steps 31, which are arranged in a circular pattern around the bottom wall of the carrier module 40. The bottom wall of the carrier module 40 is provided with a plurality of annular grooves 41, each of which is adapted to fit within the annular steps 31. The interlocking engagement between the annular steps 31 and the annular grooves 41 constrains the carrier module 40 in any direction on the plane, preventing it from falling off the heat-conducting oscillating plate 30 and improving stability.

[0046] like Figure 3 As shown, upwardly extending claws 32 are provided on at least two opposing sidewalls of the thermally conductive oscillating disk 30, and slots 42 are provided on at least two opposing sidewalls of the carrier module 40. Each claw 32 is inserted into a corresponding slot 42 and engages vertically with the slot 42. The engagement of the claws 32 with the slots 42 constrains the carrier module 40 vertically, thereby ensuring that the carrier module 40 maintains stable contact with the thermally conductive oscillating disk 30 during the rotary oscillation process. This ensures stable heat transfer from the thermally conductive oscillating disk 30 to the carrier module 40 and prevents the carrier module 40 from moving and falling off.

[0047] For details, see Figure 3 and Figure 5The top of the above-mentioned claw 32 is provided with a wedge-shaped buckle 321, and the groove wall of the slot 42 is provided with a clamping platform 421 suitable for clamping the buckle 321. A stripping plate 422 is slidably connected in the slot 42, and the stripping plate 422 is used to push the wedge surface of the buckle 321 downward to disengage the buckle 321 from the clamping platform 421. When the carrier module 40 is installed and the annular groove 41 is inserted into the annular table 31, the claws 32 are correspondingly inserted into the corresponding grooves 42. As the carrier module 40 gradually comes into contact with the heat-conducting oscillation disk 30, the buckle 321 at the top of the claw 32 is subsequently engaged with the table surface of the table 421, thereby realizing a reliable connection of the carrier module 40 on the heat-conducting oscillation disk 30; when it is necessary to disassemble and replace the carrier module 40 of other models, it is only necessary to slide the stripping plate 422 downward, and use the stripping plate 422 to insert the gap between the buckle 321 and the bottom of the groove 42 and the wedge surface of the buckle 321 to make the buckle 321 turn outward and detach from the table 421. At this time, the carrier module 40 can be directly removed, and the operation is simple and convenient.

[0048] It should be noted that if Figure 1 As shown, a control panel 70 is embedded on one side of the working chamber 100 of the metal bath body 10. The control panel 70 is electrically connected to the controller. The control panel 70 includes a display screen and control buttons. By setting the control panel 70, the controller parameters can be easily set, such as adjusting the preset temperature.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Constant temperature oscillating metal bath, characterized in that, include: The metal bath body has a top surface provided with a downwardly concave working chamber, and a controller is provided in the metal bath body; an oscillating main drive mechanism, disposed inside the metal bath body and electrically connected to the controller, the oscillating main drive mechanism having a rotary oscillating output end extending upward into the working chamber; a heat-conducting oscillation disk, disposed in the working chamber and elastically connected to the rotary oscillation output end, wherein an electric heating element is provided inside the heat-conducting oscillation disk, and the electric heating element is controlled by the controller and is used to maintain a constant preset temperature of the heat-conducting oscillation disk; A carrier module is detachably connected to the heat-conducting oscillating plate, and an array of test tube holes is distributed on the carrier module; Wherein, an oscillation auxiliary component is provided between the peripheral wall of the heat-conducting oscillation disk and the cavity wall of the working cavity, and the oscillation auxiliary component is used to apply an oscillation coupling force to the heat-conducting oscillation disk.

2. The constant temperature oscillating metal bath according to claim 1, characterized in that The oscillation auxiliary component includes: A plurality of first magnetic steels are sequentially spaced apart along the circumferential wall of the working chamber; A plurality of second magnetic steels are distributed at intervals on the peripheral wall of the heat-conducting oscillation disk and are coupled with respective first magnetic steels to generate the oscillation coupling force.

3. The constant temperature oscillating metal bath according to claim 2, characterized in that The rotary oscillation output end is provided with an elastic coupling, and the heat-conducting oscillation disk is connected to the rotary oscillation output end through the elastic coupling.

4. The constant temperature oscillating metal bath according to claim 1, characterized in that The oscillating main drive mechanism comprises: a driving motor, fixedly connected to the metal bath body and electrically connected to the controller; an eccentric transmission member, one end of which is connected to the output end of the drive motor, and the other end of which penetrates into the working chamber and forms the rotary oscillation output end; Multiple crankshafts are distributed in an array in the working chamber, and one end of each crankshaft is rotatably connected to the bottom wall of the working chamber, and the other end is rotatably connected to the bottom wall of the heat-conducting oscillation disk. The eccentricity of the crankshaft and the eccentric transmission member is consistent.

5. The constant temperature oscillating metal bath according to claim 4, characterized in that A rotary track hole is provided at the center of the bottom wall of the working chamber; the eccentric transmission member includes an eccentric disk, a first shaft section connected to one side of the eccentric disk and deviated from the center of the eccentric disk, and a second shaft section connected to the center of the other side of the eccentric disk; wherein, the eccentric disk rolls on the hole wall of the rotary track hole, the first shaft section is fixedly connected to the output end of the drive motor, and the second shaft section serves as the rotary oscillation output end and is rotatably connected to the heat-conducting oscillation disk.

6. The constant temperature oscillating metal bath according to claim 5, characterized in that The edge of the eccentric disk away from the first shaft section is provided with a plurality of rollers spaced apart along its circumference, and each of the rollers rolls on the hole wall of the rotary track hole.

7. The constant temperature oscillating metal bath according to claim 1, characterized in that The top wall edge of the heat-conducting oscillating plate is sequentially provided with a plurality of ring platforms, and the bottom wall of the carrier module is provided with a plurality of ring grooves suitable for embedding the ring platforms respectively.

8. The constant temperature oscillating metal bath according to claim 1, characterized in that At least two opposite side walls of the heat-conducting oscillation plate are provided with upwardly extending claws, and at least two opposite side walls of the carrier module are provided with slots, and each claw is respectively inserted into each slot and engaged with the slot up and down.

9. The constant temperature oscillating metal bath according to claim 8, characterized in that A wedge-shaped buckle is provided at the top of the clamping claw, and a clamping platform suitable for clamping the buckle is provided on the groove wall of the clamping slot. A stripping plate is slidably connected in the clamping slot, and the stripping plate is used to push the wedge surface of the buckle downward to disengage the buckle from the clamping platform.

10. The constant temperature oscillating metal bath according to any one of claims 1 to 9, characterized in that: A control panel is embedded on one side of the working chamber of the metal bath body, and the control panel is electrically connected to the controller.

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