Electrode frame with circular groove fixing function

Abstract

The electrode frame with the circular groove fixing function comprises a frame body, an annular installation groove and a flow channel, the frame body is of a flat plate structure, a through hole is formed in the middle of the frame body, the annular installation groove is formed in a frame body plate face on the periphery of the through hole in the middle of the frame body, the side face of the annular installation groove is communicated with the through hole, and the flow channel is oppositely arranged on the frame body plate face and communicated with the annular installation groove. An electrolyte inlet and an electrolyte outlet are formed in the open end of the flow channel, the diaphragm or the bipolar plate is mounted on the frame body through an annular mounting groove, and the annular mounting groove is of a semi-closed structure provided with opposite mounting stable baffles parallel to the plate surface of the frame body and a stepped groove surface arranged opposite to the mounting stable baffles. The annular mounting groove of the device adopts a linear occlusion structure, so that the diaphragm mounting is more stable compared with a conventional way of covering a film and tightening through a notch, meanwhile, the occlusion force of the linear occlusion structure is gradually increased from outside to inside, and the diaphragm is prevented from being damaged by tension or losing efficacy after being damaged.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production by water electrolysis, and in particular to an electrode frame with a circular groove fixing function. Background Technology

[0002] Many well-known membranes are available for use in electrolyzers. Typical membranes include perfluorinated carboxyl or sulfonyl cation exchange membranes, such as Nafion membranes manufactured by EIdupont de Nemours and Company, or Flemions membranes manufactured by Asahi Glass Company, Ltd. These membranes are typically available in sheet form for use in filter press or flat-plate electrolyzers with monopolar or bipolar electrodes. Examples of bipolar filter press electrolyzers are described in U.S. Patents 4,111,779 and 4,108,742. These electrolyzers, for example, are used to electrolyze aqueous alkali metal halides to produce halogens such as chlorine, and hydroxides of alkali metals such as sodium hydroxide. Typically, a bipolar filter press electrolyzer consists of several bipolar single-chamber units arranged in series. Each bipolar single-chamber unit has an anode and cathode space separated by a partition wall. In a typical structure, the anode and cathode are attached to opposite sides of a partition wall. A diaphragm is usually placed between two adjacent single chambers to separate the anode and cathode spaces. A large number of anode and cathode frames are installed in a parallel pattern, and a longitudinal clamping device clamps these anode and cathode frames together with the diaphragms between the frames to form a monolithic electrolytic cell.

[0003] Patent CN202936490U discloses an electrode frame with a circular groove fixing function for a pressure filter bipolar electrolyzer. The key feature is that a circular groove is machined from the inner ring to the outer ring on the side of the annular electrode frame that is in contact with the diaphragm, and the outer diameter of the groove is large enough to embed and fix the corresponding diaphragm within it. This invention's electrode frame with a circular groove fixing function for a pressure filter bipolar electrolyzer simplifies electrolyzer assembly, ensures assembly quality, and effectively improves the purity of the electrolyzed separated gas.

[0004] Because this type of structure is an inlaid structure, the installation of the diaphragm may be unstable, which may lead to diaphragm failure.

[0005] An electrode frame with a circular groove fixing function is needed to solve the above problems. Utility Model Content

[0006] This invention addresses the problem that the existing technology uses an inlaid structure for the diaphragm, which may lead to unstable installation of the diaphragm and consequently diaphragm failure. It provides an electrode frame with a circular groove fixing function, which solves the above problem through linear clamping.

[0007] This utility model provides an electrode frame with a circular groove fixing function, including a frame body, an annular mounting groove, and a flow channel. The frame body is a flat plate structure with a through hole in the middle. The annular mounting groove is located on the frame plate surface around the through hole in the middle of the frame body and is connected to the through hole on the side. The flow channel is located opposite to the frame plate surface and is connected to the annular mounting groove. The open end of the flow channel is provided with an electrolyte inlet and outlet. A diaphragm or bipolar plate is mounted on the frame body through the annular mounting groove. The annular mounting groove is a semi-closed structure with a mounting stabilizing baffle parallel to the frame plate surface and a stepped groove surface opposite to the mounting stabilizing baffle.

[0008] In a preferred embodiment of the electrode frame with a circular groove fixing function described in this utility model, the annular mounting groove includes at least two sets of two-stage stepped groups and a pair of mounting stabilizing baffles. Both the two-stage stepped groups and the mounting stabilizing baffles are disposed on the inner surface of the frame. The mounting stabilizing baffles are strip-shaped flat plates disposed around the outer periphery of the through-hole in the frame. The two mounting stabilizing baffles are symmetrically arranged, with their outer surfaces coplanar with the frame. The two-stage stepped groups extend along the frame towards the through-hole, with the thickness decreasing sequentially from the frame towards the through-hole. Each two-stage stepped group consists of two parallel steps. The outer surface of the two-stage stepped group is coplanar with the frame plate surface, and the inner surface is a stepped surface. The thinner step in the two-stage stepped group is located near the through-hole. The thinner step in another two-stage stepped group connected to the thicker step has a thickness less than the thickness of the thicker step in this group but greater than the thickness of the thinner step in this group.

[0009] In the preferred embodiment of the electrode frame with circular groove fixing function described in this utility model, the flow channel is an open or semi-open structure relative to the frame.

[0010] In a preferred embodiment of the electrode frame with a circular groove fixing function described in this utility model, a flow guide protrusion is provided on the flow channel in the direction of electrolyte flow.

[0011] The electrode frame with a circular groove fixing function described in this utility model is preferably made of one or more of the following materials: polyethylene, polypropylene, and polyvinyl chloride, which are resistant to acid and alkali corrosion.

[0012] The beneficial effects of this utility model are as follows:

[0013] (1) The annular mounting groove of this device adopts a linear interlocking structure, which makes the diaphragm installation more stable than the conventional method of tightening the membrane by covering the groove. At the same time, the interlocking force of the linear interlocking structure gradually increases from the outside to the inside, which avoids the diaphragm being damaged by tension or failing after being damaged.

[0014] (2) This device is equipped with a stabilizing baffle to prevent the overall diaphragm from failing due to edge warping. Attached Figure Description

[0015] Figure 1 A schematic diagram of an electrode frame with a circular groove fixing function;

[0016] Figure 2 This is a schematic diagram of the cross-section of an annular mounting groove of an electrode frame with a circular groove fixing function.

[0017] Figure label:

[0018] 1. Frame; 2. Annular mounting groove; 21. Second-stage stepped assembly; 22. Mounting stabilizing baffle; 3. Flow channel. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Example 1

[0021] like Figure 1 As shown, an electrode frame with a circular groove fixing function includes a frame body 1, an annular mounting groove 2, and a flow channel 3. The frame body 1 is a flat plate structure with a through hole in the middle. The annular mounting groove 2 is located on the plate surface of the frame body 1 around the through hole in the middle and is connected to the through hole on the side. The flow channel 3 is located opposite to the plate surface of the frame body 1 and is connected to the annular mounting groove 2. The open end of the flow channel 3 is provided with an electrolyte inlet and outlet. A diaphragm or bipolar plate is installed on the frame body 1 through the annular mounting groove 2. The annular mounting groove 2 is a semi-closed structure with a mounting stabilizing baffle 22 parallel to the plate surface of the frame body 1 and a stepped groove surface set opposite to the mounting stabilizing baffle 22.

[0022] like Figure 2 As shown, the annular mounting groove 2 includes at least two sets of second-order stepped groups 21 and a pair of mounting stabilizing baffles 22. Both the second-order stepped groups 21 and the mounting stabilizing baffles 22 are disposed on the inner surface of the frame 1. The mounting stabilizing baffles 22 are strip-shaped flat plates disposed around the through-hole of the frame 1. The two mounting stabilizing baffles 22 are symmetrically arranged, and their outer surfaces are coplanar with the frame 1. The second-order stepped groups 21 extend along the frame 1, with the mounting stabilizing baffles 22 facing inwards towards the through-hole. The thickness of step 21 decreases sequentially from frame 1 toward the through hole. The second-order step group 21 consists of two parallel steps. The outer side of the second-order step group 21 is coplanar with the surface of frame 1. The inner side of the second-order step group 21 is a step surface. The thinner step in the second-order step group 21 is located on the side closer to the through hole. The thinner step in another second-order step group 21 connected to the thicker step has a thickness less than the thickness of the thicker step in this second-order step group 21, but greater than the thickness of the thinner step in this second-order step group 21.

[0023] The flow channel 3 has an open or semi-open structure relative to the frame 1.

[0024] The flow channel 3 is provided with a backflow protrusion in the direction of electrolyte flow.

[0025] The frame 1 is made of one or more of the following materials: polyethylene, polypropylene, and polyvinyl chloride, which are resistant to acid and alkali corrosion.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An electrode frame with a circular groove fixing function, characterized in that: The device includes a frame (1), an annular mounting groove (2), and a flow channel (3). The frame (1) is a flat plate structure with a through hole in the middle. The annular mounting groove (2) is located on the outer periphery of the through hole in the middle of the frame (1) and is connected to the through hole on the side. The flow channel (3) is located opposite to the annular mounting groove (2) on the frame (1). The open end of the flow channel (3) is provided with an electrolyte inlet and outlet. A diaphragm or bipolar plate is installed on the frame (1) through the annular mounting groove (2). The annular mounting groove (2) is a semi-closed structure with a mounting stabilizing baffle (22) parallel to the frame (1) and a stepped groove surface relative to the mounting stabilizing baffle (22).

2. The electrode frame with a circular groove fixing function according to claim 1, characterized in that: The annular mounting groove (2) includes at least two sets of two-stage stepped groups (21) and a pair of mounting stabilizing baffles (22). The two-stage stepped groups (21) and the mounting stabilizing baffles (22) are both disposed on the inner surface of the frame (1). The mounting stabilizing baffles (22) are strip-shaped flat plate structures disposed around the through hole of the frame (1). The two mounting stabilizing baffles (22) are symmetrically arranged. The outer surface of the mounting stabilizing baffles (22) is coplanar with the frame (1). The two-stage stepped groups (21) are arranged along the frame (1), and the mounting stabilizing baffles (22) are arranged with their opposite side plates facing the inside of the through hole. The thickness of the two-stage step group (21) decreases sequentially from the frame (1) toward the through hole. The two-stage step group (21) consists of two parallel steps. The outer side of the two-stage step group (21) is coplanar with the plate surface of the frame (1). The inner side of the two-stage step group (21) is a step surface. The thinner step in the two-stage step group (21) is located near the through hole. The thinner step in another two-stage step group (21) connected to the thicker step has a thickness less than the thickness of the thicker step in this two-stage step group (21) but greater than the thickness of the thinner step in this two-stage step group (21).

3. The electrode frame with a circular groove fixing function according to claim 1, characterized in that: The flow channel (3) is an open or semi-open structure relative to the frame (1).

4. An electrode frame with a circular groove fixing function according to claim 3, characterized in that: The flow channel (3) is provided with a flow guide protrusion in the direction of electrolyte flow.

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