Second-order low-pass filter circuit pH meter

Abstract

The utility model relates to the technical field of pH meters, and provides a second-order low-pass filter circuit pH meter, which comprises a host and a display screen, the display screen is embedded on one side of the top end of the host, a filter is arranged at one end of the host, a support is fixed on one side of the host, and a fixing seat is fixed on one side of the top of the support. According to the utility model, the anti-interference structure is arranged, the cable is fixed at the top end of the glass electrode, the first shielding layer is arranged at the outer side of the cable, the interference of high-resistance signals is shielded under the action of the first shielding layer, and the second shielding layer is arranged at the outer side of the first shielding layer, so that the interference of the high-resistance signals is prevented under the action of the second shielding layer. According to the second-order low-pass filter circuit pH meter, electromagnetic interference in the environment is shielded, so that interference can be filtered out, the signal-to-noise ratio is increased, pH signal integrity and conversion precision are guaranteed, the function of facilitating interference resistance of the device is achieved, and the working efficiency of the second-order low-pass filter circuit pH meter in use is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pH meters, in particular to a pH meter with a second-order low-pass filter circuit. Background Art

[0002] A pH meter, also known as a pH meter, is an instrument used to measure the pH value of a solution. It determines the acidity or alkalinity of the solution by measuring the concentration of hydrogen ions in the solution, that is, the pH value. Most ordinary domestic pH meters on the market are applicable to the civilian and industrial fields, and few can meet the military-grade standards. Ordinary pH meters are not processed for software and hardware in terms of electromagnetic compatibility in design and can only be used in an environment without electromagnetic interference. If used in an electromagnetic interference environment, the instrument cannot measure accurately. Therefore, a pH meter with a second-order low-pass filter circuit will be used.

[0003] When the existing pH meter is in use, due to its inconvenience in anti-interference and filtering out interference to improve the signal-to-noise ratio, it is inconvenient to ensure the integrity of the pH signal and the conversion accuracy, resulting in low working efficiency during use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a pH meter with a second-order low-pass filter circuit to solve the defect that the existing pH meter with a second-order low-pass filter circuit is inconvenient in anti-interference.

[0005] To solve the above technical problems, the utility model provides the following technical solution: A pH meter with a second-order low-pass filter circuit includes a main unit and a display screen.

[0006] One side of the top of the main unit is inlaid with a display screen. One end of the main unit is provided with a filter. One side of the main unit is fixed with a bracket. One side of the top of the bracket is fixed with a fixing seat, and a placement groove penetrates through one side of the inside of the fixing seat.

[0007] A glass electrode penetrates through the inside of the placement groove. An anti-interference structure is fixed to the top of the glass electrode. The anti-interference structure includes a cable, a first shielding layer, and a second shielding layer. The cable is fixed to the top of the glass electrode. The first shielding layer is arranged on the outer side of the cable, and the second shielding layer is arranged on the outer side of the first shielding layer.

[0008] A limiting structure is installed inside the fixing seat on one side of the placement groove. A fixing disk is fixed to the outer side of the bottom of the glass electrode, and a fixing structure is sleeved on the outer side of the glass electrode at the bottom end of the fixing disk.

[0009] When using this device, by setting an anti-interference structure, the function of facilitating anti-interference of this device is realized, thereby improving the working efficiency of this pH meter of the second-order low-pass filter circuit during use; by setting a limiting structure, the function of facilitating fixation of this device is realized, thereby improving the applicability of this pH meter of the second-order low-pass filter circuit during use; by setting a fixing structure, the function of facilitating the protection of the glass electrode of this device is realized, thereby improving the convenience of this pH meter of the second-order low-pass filter circuit during use.

[0010] Preferably, one end of the cable far from the glass electrode is fixedly connected to the input end of the filter. The cable is fixed at the top of the glass electrode. A first shielding layer is arranged on the outer side of the cable. Under the action of the first shielding layer, the interference of high-impedance signals is shielded. A second shielding layer is arranged on the outer side of the first shielding layer. Under the action of the second shielding layer, the electromagnetic interference in the environment is shielded, so that interference can be filtered out to improve the signal-to-noise ratio and ensure the integrity and conversion accuracy of the pH signal.

[0011] Preferably, the limiting structure includes a movable groove, a threaded column, a handle, a clamping plate and a rubber pad. The movable groove is opened in the inner part of the fixed seat on one side of the placing groove. The threaded column penetrates through the inner part of the movable groove. One end of the threaded column extends to the outside of the fixed seat and is fixed with a handle. The other end of the threaded column is rotatably connected with a clamping plate, and a rubber pad is fixed on one side of the clamping plate.

[0012] Preferably, the threaded column and the fixed seat are designed in a threaded connection, and the top view cross-section of the clamping plate is designed in an arc shape. Rotate the handle, the handle drives the threaded column to rotate inside the fixed seat, and the threaded column drives the clamping plate to move into the inner part of the movable groove, and the glass electrode is moved into the inner part of the placing groove.

[0013] Preferably, the top view cross-section of the rubber pad is designed in an arc shape, and one side of the rubber pad abuts against one side of the glass electrode. Rotate the handle to make the threaded column drive the clamping plate to move, and the clamping plate drives the rubber pad to move to one side of the glass electrode. At this time, the glass electrode is in a fixed state.

[0014] Preferably, the fixing structure includes a protective cover, a clamping groove, a clamping block and a reserved groove. The protective cover is sleeved on the outer side of the bottom of the glass electrode. Clamping grooves are opened on both sides of the top of the protective cover inside the fixed disk. Clamping blocks are arranged inside the clamping grooves, and reserved grooves are arranged inside the clamping blocks.

[0015] Preferably, grooves are opened on both sides of the protective cover, and the clamping grooves are symmetrically distributed on both sides of the bottom of the fixed disk. By opening grooves on both sides of the protective cover, the protective cover is sleeved on the outer side of the bottom of the glass electrode through the grooves, so that the top of the clamping block abuts against the bottom of the clamping groove.

[0016] Preferably, the clamping block and the fixing plate form a clamping structure through a clamping groove. When the protective cover is pushed, the protective cover drives the clamping block to move into the clamping groove under the action of the reserved groove, thereby clamping and fixing the protective cover and the fixing plate to each other.

[0017] Preferably, the bottom end of the clamping block extends to the outside of the fixed plate and is fixedly connected to the top end of the protective cover. Under the action of the protective cover, the glass electrode can be conveniently protected.

[0018] The utility model provides a second-order low-pass filter circuit pH meter, which has the following advantages:

[0019] By providing an anti-interference structure, the device is fixed to the top of the glass electrode through a cable, and a first shielding layer is provided on the outside of the cable. Under the action of the first shielding layer, the interference of high-impedance signals is shielded. A second shielding layer is provided on the outside of the first shielding layer. Under the action of the second shielding layer, electromagnetic interference in the environment is shielded, thereby filtering out interference to improve the signal-to-noise ratio, ensure the integrity of the pH signal and the conversion accuracy, and realize the anti-interference function of the device, thereby improving the working efficiency of the second-order low-pass filter circuit pH meter when in use;

[0020] By setting a limited position structure, the handle is rotated, and the handle drives the threaded column to rotate inside the fixing seat, and the threaded column drives the clamping plate to move into the inside of the movable groove, and the glass electrode is moved into the inside of the placement groove. The handle is rotated, so that the threaded column drives the clamping plate to move, and the clamping plate drives the rubber pad to move to one side of the glass electrode. At this time, the glass electrode is in a fixed state, realizing the function of facilitating the fixing of the device, thereby improving the applicability of the second-order low-pass filter circuit pH meter when in use;

[0021] By providing a fixing structure, grooves are opened on both sides of the protective cover, and the protective cover is sleeved on the outer side of the bottom of the glass electrode through the grooves, so that the top of the clamping block contacts the bottom end of the clamping groove, and the protective cover is pushed. Under the action of the reserved groove, the protective cover drives the clamping block to move to the inside of the clamping groove, and then the protective cover and the fixed plate are clamped and fixed to each other. Under the action of the protective cover, the glass electrode is conveniently protected, and the function of the device to facilitate protection of the glass electrode is realized, thereby improving the convenience of the second-order low-pass filter circuit pH meter when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0023] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0024] Figure 3 This is a schematic side sectional structural diagram of the fixing structure of the present utility model;

[0025] Figure 4 The front view sectional structure diagram of the anti-interference structure of the present utility model;

[0026] Figure 5 Of the present utility model Figure 3 The enlarged structure diagram at position A;

[0027] Figure 6 The top view sectional structure diagram of the limit structure of the present utility model.

[0028] Explanation of the reference numerals in the figure: 1, main body; 2, display screen; 3, bracket; 4, fixed seat; 5, anti-interference structure; 501, cable; 502, first shielding layer; 503, second shielding layer; 6, limit structure; 601, movable groove; 602, threaded column; 603, handle; 604, clamping plate; 605, rubber pad; 7, placement groove; 8, glass electrode; 9, fixed disk; 10, fixing structure; 1001, protective cover; 1002, clamping groove; 1003, clamping block; 1004, reserved groove; 11, filter. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Please refer to Figures 1-6 , a second-order low-pass filter circuit pH meter provided by the present utility model includes a main body 1 and a display screen 2. One side of the top end of the main body 1 is inlaid with the display screen 2. One end of the main body 1 is provided with a filter 11. One side of the main body 1 is fixed with a bracket 3. One side of the top of the bracket 3 is fixed with a fixed seat 4. One side inside the fixed seat 4 is penetrated with a placement groove 7. The inside of the placement groove 7 is penetrated with a glass electrode 8. The top end of the glass electrode 8 is fixed with an anti-interference structure 5. The anti-interference structure 5 includes a cable 501, a first shielding layer 502 and a second shielding layer 503. The cable 501 is fixed to the top end of the glass electrode 8. The outer side of the cable 501 is provided with the first shielding layer 502. The outer side of the first shielding layer 502 is provided with the second shielding layer 503. One end of the cable 501 away from the glass electrode 8 is fixedly connected to the input end of the filter 11.

[0031] Refer to Figure 2 And Figure 4As shown, it is fixed to the top of the glass electrode 8 through the cable 501. A first shielding layer 502 is arranged on the outer side of the cable 501. Under the action of the first shielding layer 502, the interference of high-resistance signals is shielded. A second shielding layer 503 is arranged on the outer side of the first shielding layer 502. Under the action of the second shielding layer 503, the electromagnetic interference in the environment is shielded, so that interference can be filtered out to improve the signal-to-noise ratio and ensure the integrity and conversion accuracy of the pH signal. By installing the filter 11 at the power input end, that is, between the cable 501 and the host 1, this can ensure that the interference noise in the power supply inserted into the host 1 is filtered out and prevent it from affecting the normal operation of the host 1.

[0032] A limiting structure 6 is installed inside the fixed seat 4 on one side of the placement groove 7. The limiting structure 6 includes a movable groove 601, a threaded column 602, a handle 603, a clamping plate 604 and a rubber pad 605. The movable groove 601 is opened inside the fixed seat 4 on one side of the placement groove 7. The threaded column 602 penetrates through the inside of the movable groove 601. One end of the threaded column 602 extends to the outside of the fixed seat 4 and is fixed with a handle 603. The other end of the threaded column 602 is rotatably connected to a clamping plate 604. A rubber pad 605 is fixed on one side of the clamping plate 604. The threaded column 602 and the fixed seat 4 are designed with a threaded connection. The top view cross-section of the clamping plate 604 is arc-shaped. The top view cross-section of the rubber pad 605 is arc-shaped. One side of the rubber pad 605 abuts against one side of the glass electrode 8.

[0033] Refer to Figure 3 and Figure 6 As shown, rotate the handle 603. The handle 603 drives the threaded column 602 to rotate inside the fixed seat 4. The threaded column 602 drives the clamping plate 604 to move into the inside of the movable groove 601, and the glass electrode 8 is moved into the inside of the placement groove 7. Rotate the handle 603 to make the threaded column 602 drive the clamping plate 604 to move. The clamping plate 604 drives the rubber pad 605 to move to one side of the glass electrode 8. At this time, the glass electrode 8 is in a fixed state.

[0034] A fixing disk 9 is fixed on the outer side of the bottom of the glass electrode 8. A fixing structure 10 is sleeved on the outer side of the glass electrode 8 at the bottom end of the fixing disk 9. The fixing structure 10 includes a protective cover 1001, a clamping groove 1002, a clamping block 1003 and a reserved groove 1004. The protective cover 1001 is sleeved on the outer side of the bottom of the glass electrode 8. Clamping grooves 1002 are opened on both sides of the top end of the protective cover 1001 inside the fixing disk 9. Clamping blocks 1003 are arranged inside the clamping grooves 1002. Reserved grooves 1004 are arranged inside the clamping blocks 1003. Grooves are opened on both sides of the protective cover 1001. The clamping grooves 1002 are symmetrically distributed on both sides of the bottom of the fixing disk 9. The clamping blocks 1003 and the fixing disk 9 form a clamping structure through the clamping grooves 1002. The bottom end of the clamping block 1003 extends to the outside of the fixing disk 9 and is fixed to the top end of the protective cover 1001.

[0035] Referring to Figure 3 and Figure 5 As shown, grooves are provided on both sides of the protective cover 1001. The protective cover 1001 is sleeved on the outer side of the bottom of the glass electrode 8 through the grooves, so that the top end of the clamping block 1003 abuts against the bottom end of the clamping groove 1002. By pushing the protective cover 1001, under the action of the reserved groove 1004, the protective cover 1001 drives the clamping block 1003 to move into the clamping groove 1002, thereby making the protective cover 1001 and the fixed disk 9 clamped and fixed to each other. Under the action of the protective cover 1001, it is convenient to protect the glass electrode 8.

[0036] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A pH meter with a second-order low-pass filter circuit, comprising a main unit (1) and a display screen (2); It is characterized in that: One side of the top of the main unit (1) is inlaid with a display screen (2). One end of the main unit (1) is provided with a filter (11). One side of the main unit (1) is fixed with a bracket (3). One side of the top of the bracket (3) is fixed with a fixing seat (4). One side of the inside of the fixing seat (4) is penetrated by a placement groove (7); A glass electrode (8) is penetrated inside the placement groove (7). An anti-interference structure (5) is fixed to the top end of the glass electrode (8). The anti-interference structure (5) includes a cable (501), a first shielding layer (502) and a second shielding layer (503). The cable (501) is fixed to the top end of the glass electrode (8). The first shielding layer (502) is arranged on the outer side of the cable (501). The second shielding layer (503) is arranged on the outer side of the first shielding layer (502); A limiting structure (6) is installed inside the fixing seat (4) on one side of the placement groove (7). A fixing disk (9) is fixed to the outer side of the bottom of the glass electrode (8). A fixing structure (10) is sleeved on the outer side of the glass electrode (8) at the bottom end of the fixing disk (9).

2. The pH meter with a second-order low-pass filter circuit according to claim 1, characterized in that: One end of the cable (501) away from the glass electrode (8) is fixedly connected to the input end of the filter (11).

3. A second-order low-pass filter circuit pH meter according to claim 1, characterized in that: The limiting structure (6) includes a movable groove (601), a threaded column (602), a handle (603), a clamping plate (604) and a rubber pad (605). The movable groove (601) is opened inside the fixing seat (4) on one side of the placement groove (7). The threaded column (602) is penetrated inside the movable groove (601). One end of the threaded column (602) extends to the outside of the fixing seat (4) and is fixed with a handle (603). The other end of the threaded column (602) is rotatably connected to a clamping plate (604). A rubber pad (605) is fixed to one side of the clamping plate (604).

4. A second-order low-pass filter circuit pH meter according to claim 3, characterized in that: The threaded column (602) and the fixing seat (4) are designed to be in threaded connection. The top view cross-section of the clamping plate (604) is designed to be arc-shaped.

5. A second-order low-pass filter circuit pH meter according to claim 3, characterized in that: The top view cross-section of the rubber pad (605) is designed to be arc-shaped. One side of the rubber pad (605) abuts against one side of the glass electrode (8).

6. A second-order low-pass filter circuit pH meter according to claim 1, characterized in that: The fixing structure (10) includes a protective cover (1001), a clamping groove (1002), a clamping block (1003) and a reserved groove (1004). The protective cover (1001) is sleeved on the outer side of the bottom of the glass electrode (8). Clamping grooves (1002) are opened on both sides of the top end of the protective cover (1001) inside the fixing disk (9). Clamping blocks (1003) are arranged inside the clamping grooves (1002). Reserved grooves (1004) are arranged inside the clamping blocks (1003).

7. A second-order low-pass filter circuit pH meter according to claim 6, characterized in that: Grooves are opened on both sides of the protective cover (1001). The clamping grooves (1002) are symmetrically distributed on both sides of the bottom of the fixing disk (9).

8. A second-order low-pass filter circuit pH meter according to claim 6, characterized in that: The clamping block (1003) and the fixing disk (9) form a clamping structure through the clamping groove (1002).

9. A second-order low-pass filter circuit pH meter according to claim 6, characterized in that: The bottom end of the clamping block (1003) extends to the outside of the fixed disk (9) and is fixedly connected to the top end of the protective cover (1001).

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