Structure for controlling influence of compression change of PVC ionic membrane on measured value

Abstract

The utility model discloses a structure for controlling the influence of the compression change of a PVC ionic membrane on a measured value, which relates to the technical field of PVC membrane compression and comprises a membrane head shell, an ionic PVC membrane is arranged at the top of the inner side of the membrane head shell, a first fixing piece is arranged below the ionic PVC membrane, a silica gel spring washer is arranged below the first fixing piece, and a second fixing piece is arranged below the silica gel spring washer. A fixing lock is arranged below the second fixing piece, internal threads are arranged on the inner side of the membrane head shell, external threads are arranged on the outer surface of the fixing lock, the fixing lock is in threaded connection with the membrane head shell through the internal threads and the external threads, and the fixing lock is used for tightening the membrane head shell. The pressure buffering area is arranged below the ion PVC membrane, the first fixing piece and the second fixing piece are stressed to form compression, the silica gel spring washer has certain deformation after being compressed, and after the membrane head shell is loosened subsequently, the compression force can be continuously generated, so that the ion PVC membrane is prevented from being loosened, and the accuracy of a measured value is effectively ensured.

Description

Technical Field

[0001] This utility model relates to the field of PVC membrane compression technology, and more specifically to a structure for controlling the influence of PVC ion exchange membrane compression changes on measured values. Background Technology

[0002] PVC's main component is polyvinyl chloride, which is a slightly yellowish, translucent, and glossy substance. Its transparency is better than polyethylene and polypropylene, but worse than polystyrene. Depending on the amount of additives used, it is classified as soft or rigid PVC. Soft PVC products are flexible and tough, with a sticky feel, while rigid PVC products have a harderness than low-density polyethylene but lower than polypropylene, and may exhibit whitening at bending points. Common products include: sheets, pipes, shoe soles, toys, doors and windows, wire sheathing, and stationery.

[0003] The PVC membrane is molded onto the PVC membrane head using a tetrahydrofuran solution. The disadvantage of this method is that the curing cycle of the PVC membrane is shortened during actual application, affecting its service life. Using the pressing method, because plasticizers are added to the PVC membrane, it is relatively soft and has a certain space for compression deformation. During subsequent use, with changes in temperature and pressure, the PVC membrane is prone to loosening, which can lead to backflow of the measuring solution, affecting the accuracy of the measurement and the frequency of maintenance. Utility Model Content

[0004] The purpose of this invention is to provide a structure for controlling the influence of PVC ion exchange membrane compression changes on the measured values, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides a structure for controlling the influence of PVC ion exchange membrane compression changes on measured values. The structure includes a membrane head shell, an ion exchange PVC membrane disposed on the top inner side of the membrane head shell, a first fixing plate disposed below the ion exchange PVC membrane, a silicone spring pad disposed below the first fixing plate, a second fixing plate disposed below the silicone spring pad, and a fixing lock head disposed below the second fixing plate. The membrane head shell has an internal thread on its inner side, and the fixing lock head has an external thread on its outer surface. The fixing lock head is threadedly connected to the membrane head shell via the internal and external threads. The ion exchange PVC membrane, the first fixing plate, the silicone spring pad, and the second fixing plate are in close sequential contact, and the fixing lock head is used to tighten the membrane head shell.

[0006] As a further improvement to this technical solution, both the first fixing piece and the second fixing piece are configured as POM gaskets, and both the first fixing piece and the second fixing piece have a circular opening at their center.

[0007] As a further improvement to this technical solution, a detection port is provided on the top of the membrane head shell, and the ion PVC membrane is closely attached to the bottom of the detection port.

[0008] As a further improvement to this technical solution, the internal thread surface is coated with silicone, and the silicone is located on the internal thread at a height of less than 5mm on the upper end of the second fixing plate.

[0009] As a further improvement to this technical solution, a slot is provided at the bottom of the fixing lock head, which is used to tighten the fixing lock head by rotating it with a customized fixture.

[0010] As a further improvement to this technical solution, the thickness of the ion-exchange PVC membrane is set to 0.5-0.8 mm, and the thickness of the silicone elastic pad is set to 20-30 mm.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. By setting a silicone elastic pad and a buffer pressure zone under the ion-exchange PVC membrane, the first and second fixing plates are subjected to pressure, causing the silicone elastic pad to deform after compression. After the membrane head shell loosens, it can continue to generate pressure, thereby preventing the ion-exchange PVC membrane from loosening and effectively ensuring the accuracy of the measurement.

[0013] 2. By setting a fixed lock head, the silicone spring pad is protected by a second fixing plate to prevent the fixed lock head from rotating directly and bearing force on the silicone spring pad, causing the silicone spring pad to twist and deform. The adhesion between the surface treatment and the fixed lock head is improved, and silicone is applied to prevent the fixed lock head from loosening. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of the present invention.

[0015] Figure 2 This is a schematic diagram of the overall structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the overall exploded structure of the utility model.

[0017] The meanings of the labels in the diagram are as follows:

[0018] 1. Membrane head shell; 2. Ion PVC membrane sheet; 3. First fixing plate; 4. Silicone spring pad; 5. Second fixing plate; 6. Fixing lock head; 7. Internal thread; 8. External thread; 9. Detection port; 10. Bayonet. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Please see Figures 1-3As shown, this utility model provides a structure for controlling the influence of PVC ion exchange membrane compression changes on measurement values. It includes a membrane head shell 1, with an ion exchange PVC membrane 2 disposed on the top inner side of the membrane head shell 1. A detection port 9 is provided on the top of the membrane head shell 1. The ion exchange PVC membrane 2 is tightly attached to the bottom of the detection port 9. The membrane head shell 1 supports and positions the ion exchange PVC membrane 2. The detection port 9 is used to detect the compression changes of the ion exchange PVC membrane 2. The thickness of the ion exchange PVC membrane 2 is set to 0.5-0.8 mm. Because plasticizers are added to the ion exchange PVC membrane 2, it is relatively soft and has a certain space for compression deformation. During subsequent use, with changes in temperature and pressure, the ion exchange PVC membrane 2 is prone to loosening, leading to backflow of the measurement solution. Therefore, to ensure the accuracy of the measurement values, a buffer pressure zone is set below the ion exchange PVC membrane 2. A first fixing plate 3 is set below the ion exchange PVC membrane 2. A silicone spring pad 4 with a thickness of 20-30mm is provided. A second fixing plate 5 is provided below the silicone spring pad 4. The ion-exchange PVC membrane 2, the first fixing plate 3, the silicone spring pad 4, and the second fixing plate 5 are in close contact in sequence. Both the first fixing plate 3 and the second fixing plate 5 are POM pads. POM pads are highly crystalline linear polymers and belong to synthetic resins. POM pads have excellent physical, mechanical, and chemical properties, especially in terms of wear resistance. The first fixing plate 3 and the second fixing plate 5 are subjected to pressure, causing the silicone spring pad 4 to deform after compression. After the membrane head shell 1 is relaxed, it can continue to generate pressure, thereby preventing the ion-exchange PVC membrane 2 from loosening and effectively ensuring the accuracy of the measurement. The first fixing plate 3 and the second fixing plate 5 are both provided with a circular opening at the center, giving them high deformation capacity.

[0022] A fixing head 6 is provided below the second fixing plate 5. The second fixing plate 5 protects the silicone spring pad 4 and prevents the fixing head 6 from being directly rotated and subjected to force on the silicone spring pad 4, causing the silicone spring pad 4 to twist and deform. The inner side of the membrane head shell 1 is provided with an internal thread 7, and the outer surface of the fixing head 6 is provided with an external thread 8. The fixing head 6 and the membrane head shell 1 are threadedly connected by the internal thread 7 and the external thread 8. The fixing head 6 is used to tighten the membrane head shell 1. The surface of the internal thread 7 is coated with silicone, and the silicone is located on the internal thread 7 at a height of less than 5mm above the second fixing plate 5. The silicone has high adhesion, and the adhesion to the fixing head 6 is improved through surface treatment. Applying silicone prevents the fixing head 6 from loosening. A bayonet 10 is provided at the bottom of the fixing head 6. The bayonet 10 is used to rotate the fixing head 6 and tighten it by using a custom fixture. The fixing head 6 can be rotated and tightened by using an existing custom fixture.

[0023] The specific working principle of this utility model is as follows: An ion-exchange PVC membrane 2 is placed inside the membrane head housing 1, then a first fixing plate 3 is placed inside the membrane head housing 1, then a silicone spring pad 4 is placed inside the membrane head housing 1, and then a second fixing plate 5 is placed inside the membrane head housing 1. Silicone is applied to the internal thread 7 at a height of less than 5mm on the upper end of the second fixing plate 5. The fixing lock 6 is rotated and tightened using an existing custom fixture. To ensure the accuracy of the measurement, a buffer pressure zone is set below the ion-exchange PVC membrane 2. The first fixing plate 3 and the second fixing plate 5 are subjected to force to form pressure, causing the silicone spring pad 4 to deform to a certain extent after compression. After the membrane head housing 1 is relaxed, it can continue to generate pressure, thereby preventing the ion-exchange PVC membrane 2 from loosening and effectively ensuring the accuracy of the measurement.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A structure for controlling the influence of PVC ion exchange membrane compression changes on measured values, comprising a membrane head shell (1), characterized in that: An ion-bonded PVC membrane (2) is provided on the top inner side of the membrane head shell (1). A first fixing plate (3) is provided below the ion-bonded PVC membrane (2). A silicone spring pad (4) is provided below the first fixing plate (3). A second fixing plate (5) is provided below the silicone spring pad (4). A fixing lock head (6) is provided below the second fixing plate (5). An internal thread (7) is provided on the inner side of the membrane head shell (1). An external thread (8) is provided on the outer surface of the fixing lock head (6). The fixing lock head (6) is threadedly connected to the membrane head shell (1) through the internal thread (7) and the external thread (8). The ion-bonded PVC membrane (2), the first fixing plate (3), the silicone spring pad (4), and the second fixing plate (5) are in close contact in sequence. The fixing lock head (6) is used to tighten the membrane head shell (1).

2. The structure for controlling the influence of PVC ion-exchange membrane compression changes on the measured values ​​according to claim 1, characterized in that: The first fixing piece (3) and the second fixing piece (5) are both set as POM gaskets, and a round opening is provided at the center of the first fixing piece (3) and the second fixing piece (5).

3. The structure for controlling the influence of PVC ion-exchange membrane compression changes on the measured values ​​according to claim 1, characterized in that: The membrane head shell (1) has a detection port (9) at the top, and the ion PVC membrane (2) is closely attached to the bottom of the detection port (9).

4. The structure for controlling the influence of PVC ion-exchange membrane compression changes on the measured values ​​according to claim 1, characterized in that: The surface of the internal thread (7) is coated with silicone, and the silicone is located on the internal thread (7) at a height of less than 5 mm at the upper end of the second fixing piece (5).

5. The structure for controlling the influence of PVC ion-exchange membrane compression changes on the measured values ​​according to claim 1, characterized in that: The bottom of the fixed lock head (6) is provided with a slot (10), which is used to tighten the fixed lock head (6) by rotating it with a custom fixture.

6. The structure for controlling the influence of PVC ion-exchange membrane compression changes on the measured values ​​according to claim 1, characterized in that: The thickness of the ion-exchange PVC membrane (2) is set to 0.5-0.8 mm, and the thickness of the silicone elastic pad (4) is set to 20-30 mm.

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