CN219590289U - Constant temperature device for detecting biochemical oxygen demand - Google Patents
Constant temperature device for detecting biochemical oxygen demand Download PDFInfo
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- CN219590289U CN219590289U CN202223228500.XU CN202223228500U CN219590289U CN 219590289 U CN219590289 U CN 219590289U CN 202223228500 U CN202223228500 U CN 202223228500U CN 219590289 U CN219590289 U CN 219590289U
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- heating
- oxygen demand
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The utility model relates to a constant temperature device for detecting biochemical oxygen demand, and belongs to the technical field of biochemical oxygen demand detection. The device solves the technical problems that the heating device used in the existing biochemical oxygen demand detection device needs high voltage to control the unsafe performance, the water body is heated unevenly, and the device and the heating device are integrated and cannot be detached, replaced and are difficult to clean. The constant temperature device comprises a first heating plate, a second heating plate, a third heating plate and a fourth heating plate; when the device is used, each heating plate is coated with heat conducting glue to be adhered on the outer surface of the biochemical oxygen demand detection device, after 24V power supply is carried out on the heating plates, current flows through copper wires to generate heat, the resistance of each heating plate is about 3-4 ohms, and two temperature sensors are placed in the middle of the inside of the constant temperature device, so that the detected temperature is closer to a water body. The constant temperature device provided by the utility model can better control the temperature of the water body to be measured to be maintained at about 36.8-37.2 ℃.
Description
Technical Field
The utility model relates to the technical field of biochemical oxygen demand detection, in particular to a constant temperature device for detecting biochemical oxygen demand.
Background
The most important step in the Biochemical Oxygen Demand (BOD) detection process is temperature control because microorganisms are greatly affected by temperature, constant temperature is an important factor for maintaining the stability of detection environment conditions, and the detection of BOD requires that the temperature of a water body to be detected is maintained at about 36.8-37.2 ℃. The heating devices currently used in the BOD detection heating method are of a large variety, such as resistance wires, heating rods, heating plates and the like.
However, the use of a heating device such as a resistance wire or a heating rod requires 220V voltage, and if the device is improperly used or the performance of the device is poor, the risk is very high, and the device temperature may be too high to burn out other devices in the device, so that the whole device is paralyzed. And the heating device is large in voltage, so that if the control mode is improper, the temperature control effect is poor, and the water body in the device is heated unevenly. In addition, the heating devices such as the resistance wire for detecting the BOD device in the market at present are integrated with the design of the device, and the resistance wire is generally directly fixed in the device and cannot be detached and replaced, so that the heating device has short service life and is easy to age, and the temperature control difficulty is increased.
Disclosure of Invention
The utility model aims to solve the technical problems in the prior art and provides a constant temperature device for detecting biochemical oxygen demand.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
the utility model provides a constant temperature device for detecting biochemical oxygen demand, which comprises a first heating plate, a second heating plate, a third heating plate and a fourth heating plate;
a first temperature sensor fixing hole, a second temperature sensor fixing hole and a two-position three-way valve fixing hole are formed in the first heating plate, temperature sensors are respectively arranged in the first temperature sensor fixing hole and the second temperature sensor fixing hole, and a two-position three-way valve is arranged in the two-position three-way valve fixing hole;
a first water inlet, a second water inlet and a first reserved device hole are formed in the second heating plate, a water sample inlet pipe to be detected is respectively arranged at the first water inlet and the second water inlet, and the water sample inlet pipe to be detected is connected with the ball valve; the first reserved device hole is a hole reserved for the subsequent addition of other auxiliary functions;
the third heating plate is provided with a liquid level sensor fixing hole, a second reserved device hole, a third reserved device hole, an aeration pump fixing hole and an LED illuminating lamp fixing hole, wherein the liquid level sensor is placed in the liquid level sensor fixing hole, the LED illuminating lamp is placed in the LED illuminating lamp fixing hole, the aeration pump is placed in the aeration pump fixing hole, and the second reserved device hole and the third reserved device hole are reserved hole positions for adding other auxiliary functions in sequence respectively;
the edges of the first heating plate, the second heating plate, the third heating plate and the fourth heating plate are respectively provided with a fixed heat dissipation hole and a wire guide hole, the fixed heat dissipation holes are used for fixing the heating plates and enabling the heating plates to dissipate heat, and the wire guide holes are used for being connected with wires in the heating plates;
when the constant temperature device is used, the first heating plate, the second heating plate, the third heating plate and the fourth heating plate are adhered and covered on the outer surface of the biochemical oxygen demand detection device through heat conduction glue, a signal conditioning circuit and an AD conversion circuit are arranged between the temperature sensor and a controller of the biochemical oxygen demand detection device, and the temperature read by the temperature sensor can be received by the controller after passing through the signal conditioning circuit and the AD conversion circuit; the two temperature sensors are arranged, so that the temperature read by the temperature probes is closer to the temperature of the water body, and the controller reads the temperatures of the two temperature probes and feeds the average value back to the controller for heating control; when the liquid level sensor detects that no water exists in the biochemical oxygen demand detection device, the information is transmitted to a controller of the biochemical oxygen demand detection device in a data form, and the controller opens a ball valve connected with a water sample inlet pipe to be detected, so that a water sample enters the biochemical oxygen demand detection device through the water sample inlet pipe to be detected; when the liquid level sensor detects that water exists in the biochemical oxygen demand detection device, the controller closes a ball valve connected with a water inlet pipe of the water sample to be detected, so that the water sample stops entering the biochemical oxygen demand detection device.
In the above technical solution, it is preferable that the wire guide is provided at positions of two corners of the lower portions of the first, second, third and fourth heating plates, respectively, and it takes an obtuse angle shape.
In the above technical solution, it is preferable that the first heating plate, the second heating plate, the third heating plate and the fourth heating plate are respectively provided with fixed heat dissipation holes at two corners of the upper portion and two sides of the middle position of the lower portion.
In the above technical solution, preferably, the first heating plate, the second heating plate, the third heating plate and the fourth heating plate are respectively circuit boards which are printed by self-drawing of PCB drawings, and copper wires are fully distributed on the boards.
In the above technical solution, it is preferable that the temperature sensor is a PT100 temperature sensor.
In the above technical solution, preferably, the voltage of the two-position three-way valve is 12V.
In the above technical scheme, preferably, the water sample inlet pipe to be detected is a rubber pipe.
In the above technical solution, preferably, the hole sizes of the first reserved device hole, the second reserved device hole and the third reserved device hole are all commonly used device hole sites M6, and an inverted cone joint is placed in each of the first reserved device hole, the second reserved device hole and the third reserved device hole.
The beneficial effects of the utility model are as follows:
the utility model provides a constant temperature device for detecting biochemical oxygen demand, which has the following advantages:
1. the required voltage of the heating plate is only 24V, the working voltage is greatly reduced, and the safety is high.
2. The heating plate is stuck to the periphery of the outside of the biochemical oxygen demand detection device through the heat-conducting glue, and the heat-conducting glue fully coats the heating plate and then sticks to the outside of the device, so that the heating plate is tightly attached to the device, heat can be better transferred to a water sample in the device, and the water sample is heated on four sides in the heating process and is more uniformly heated.
3. The heating plate and the biochemical oxygen demand detection device are in a separated state, and can be replaced after the heating plate has the problems of aging and the like. And the heating plate and the inside of the biochemical oxygen demand detection device are integrated, so that the device is not well cleaned, but a part of space is reserved in the separation state for the inside of the device, and the cleaning and observation of the experimental process are facilitated.
4. The two sensors are placed in the middle of the inside of the thermostat device of the utility model so that the detected temperature is closer to the water body.
Drawings
Fig. 1 is a schematic structural view of a first heating plate of the present utility model.
Fig. 2 is a schematic structural view of a second heating plate of the present utility model.
Fig. 3 is a schematic structural view of a third heating plate of the present utility model.
Fig. 4 is a schematic structural view of a fourth heating plate of the present utility model.
Fig. 5 is a view showing an angle of use of the thermostat of the present utility model.
Fig. 6 is a view showing another angle of use of the thermostat of the present utility model.
Reference numerals in the drawings denote:
1-a first heating plate, 2-a second heating plate, 3-a third heating plate, 4-a fourth heating plate, 5-fixed heat dissipation holes, 6-wire guide holes and 7-a biochemical oxygen demand detection device;
11-a first temperature sensor fixing hole, 12-a second temperature sensor fixing hole and 13-a two-position three-way valve fixing hole;
21-a first water inlet, 22-a second water inlet, 23-a first reserved device hole;
31-liquid level sensor fixing holes, 32-second reserved device holes, 33-third reserved device holes, 34-aeration pump fixing holes and 35-LED illuminating lamp fixing holes.
Detailed Description
The utility model is described in further detail below with reference to the drawings and the detailed description.
Referring to fig. 1 to 6, a thermostat for detecting biochemical oxygen demand provided by the present utility model includes a first heating plate 1, a second heating plate 2, a third heating plate 3 and a fourth heating plate 4; the shape of each heating plate is designed according to the external shape of the applicable biochemical oxygen demand detection device 7, so that the heating plates are attached to the biochemical oxygen demand detection device 7 to achieve better temperature control effect. In this embodiment, each heating plate is designed to be approximately rectangular in shape, and each heating plate is a circuit board printed by self-drawing a PCB pattern.
A first temperature sensor fixing hole 11, a second temperature sensor fixing hole 12 and a two-position three-way valve fixing hole 13 are formed in the first heating plate 1, temperature sensors are respectively placed in the first temperature sensor fixing hole 11 and the second temperature sensor fixing hole 12, and a two-position three-way valve is placed in the two-position three-way valve fixing hole 13; the second heating plate 2 is provided with a first water inlet 21, a second water inlet 22 and a first reserved device hole 23, the first water inlet 21 and the second water inlet 22 are respectively provided with a water sample inlet pipe to be detected, the water sample inlet pipe to be detected is a rubber pipe, the rubber pipe is connected with a ball valve, the ball valve is used for controlling water samples to enter and exit, and the two water inlets are used for accelerating the water inlet speed, so that the time of a detection flow is reduced; the first reserved device hole 23 is provided with an inverted cone joint, the hole size is the hole position M6 of the common device, and the reserved hole position is reserved for the subsequent addition of other auxiliary functions, so that design and processing devices can be avoided, and the cost is further reduced.
The third heating plate 3 is provided with a liquid level sensor fixing hole 31, a second reserved device hole 32, a third reserved device hole 33, an aeration pump fixing hole 34 and an LED lighting lamp fixing hole 35, the liquid level sensor is placed in the liquid level sensor fixing hole 31, and the LED lighting lamp is placed in the LED lighting lamp fixing hole 35, so that the device is more convenient to clean, and the lighting lamp can be turned on during cleaning; the aeration pump is arranged in the aeration pump fixing hole 34, so that sufficient oxygen can be provided for the water sample in the device, and the circulating flow of the water sample can be promoted; the second reserved device hole 32 and the third reserved device hole 33 are respectively provided with an inverted cone joint, the hole size is the hole position M6 of the common device, and the hole positions reserved for other auxiliary functions are added subsequently, so that design and processing devices can be avoided, and the cost is further reduced.
The lower two corners of the first heating plate 1, the second heating plate 2, the third heating plate 3 and the fourth heating plate 4 are respectively provided with a wire guide 6 which takes on an obtuse angle shape; the two sides of the upper two corners and the lower middle position of the first heating plate 1, the second heating plate 2, the third heating plate 3 and the fourth heating plate 4 are respectively provided with fixed heat dissipation holes 5; the fixing heat dissipation holes 5 are used for fixing and dissipating heat, and as the heating plate can generate heat in a working state, through holes are added to enable the heating plate to dissipate heat; the wire guide 6 is connected with wires in the heating plate, and aims to lead out the wires so as to be connected with a controller of the biochemical oxygen demand detection device 7, and meanwhile, the heating plate is conveniently tested to be communicated with the power supply. The wire corners of the heating plate are shaped to form obtuse angles in order to prevent uncontrollable phenomena such as electromagnetic interference caused by signal reflection and impedance discontinuity.
Because the constant temperature device provided by the utility model has no device placed on the fourth heating plate 4, the fourth heating plate 4 is not perforated, so that the heating rate can be increased, the heating time is faster, and the time of the detection flow can be further reduced.
When the constant temperature device is used, the first heating plate 1, the second heating plate 2, the third heating plate 3 and the fourth heating plate 4 are adhered to the outer surface of the biochemical oxygen demand detection device 7 through heat conduction glue, wherein the heat conduction glue needs to be coated on each whole heating plate, so that the surface of each heating plate and the surface of the biochemical oxygen demand detection device 7 are adhered more firmly, the heat conduction effect is improved, and most of heat is transferred to a water body inside the biochemical oxygen demand detection device 7 through the heating plates instead of the heating plates. A signal conditioning circuit and an AD conversion circuit (the signal conditioning circuit and the AD conversion circuit are realized by a PT100 resistance temperature measurement module with a MAX31865 chip, the working voltage is 12V) are arranged between the temperature sensor and the controller of the biochemical oxygen demand detection device 7, and the controller can receive the temperature read by the temperature sensor after the temperature is required to pass through the signal conditioning circuit and the AD conversion circuit; the two temperature sensors are arranged, so that the temperature read by the temperature probes is closer to the temperature of the water body, and the controller reads the temperatures of the two temperature probes, and takes the average value of the temperatures and feeds the average value back to the controller to control heating. The temperature sensor is a PT100 temperature sensor. The two-position three-way valve is arranged so as to be capable of passing through a water sample in the controller switching device, the two-position three-way valve is provided with three hole sites, the No. 1 hole site is in a normally open state, and the No. 1 hole site is connected with the No. 2 hole site when the controller switching device is not electrified; when the power is on, the hole 1 can switch the valve inside to be connected with the hole 3. The voltage of the two-position three-way valve is 12V.
When the liquid level sensor detects that no water exists in the biochemical oxygen demand detection device 7, the information is transmitted to a controller of the biochemical oxygen demand detection device 7 in a data form, and the controller opens a ball valve connected with a water sample inlet pipe to be detected, so that the water sample enters the biochemical oxygen demand detection device 7 through the water sample inlet pipe to be detected; when the liquid level sensor detects that water exists in the biochemical oxygen demand detection device 7, the controller closes a ball valve connected with a water sample inlet pipe to be detected, so that the water sample stops entering the biochemical oxygen demand detection device 7.
By the constant temperature device provided by the utility model, 4 heating plates are placed around the biochemical oxygen demand detection device 7 for heating and temperature control. Each heating plate is a circuit board which is printed by drawing a PCB (printed Circuit Board) by itself, and copper wires are fully distributed on the circuit board. When the heating plates are supplied with power of 24V, current flows through the copper wires to generate heat, and the resistance of each heating plate is about 3-4 ohms. Two temperature sensors are arranged in the middle of the inside of the constant temperature device, so that the detected temperature is closer to the water body. The controller of the biochemical oxygen demand detection device 7 drives four heating plates through a PID algorithm to realize the temperature control effect, and is an STM32F103RCT6 singlechip. The constant temperature device provided by the utility model can better control the temperature of the water body to be measured to be maintained at about 36.8-37.2 ℃.
The constant temperature device for detecting the biochemical oxygen demand provided by the utility model has the advantages that 4 heating plates are manufactured by self, the heating plates are arranged around the detection device for heating and temperature control, the heating is uniform, the low-voltage operation is realized, and the safety is high; the heating device and the device are in a separated state, so that the problems of short service life, easiness in aging and the like are solved, and the cleaning is convenient.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (8)
1. A thermostat device for detecting biochemical oxygen demand, which is characterized by comprising a first heating plate (1), a second heating plate (2), a third heating plate (3) and a fourth heating plate (4);
a first temperature sensor fixing hole (11), a second temperature sensor fixing hole (12) and a two-position three-way valve fixing hole (13) are formed in the first heating plate (1), temperature sensors are respectively arranged in the first temperature sensor fixing hole (11) and the second temperature sensor fixing hole (12), and a two-position three-way valve is arranged in the two-position three-way valve fixing hole (13);
a first water inlet (21), a second water inlet (22) and a first reserved device hole (23) are formed in the second heating plate (2), a water sample inlet pipe to be detected is respectively arranged at the first water inlet (21) and the second water inlet (22), and the water sample inlet pipe to be detected is connected with a ball valve; the first reserved device hole (23) is a reserved hole site;
the liquid level sensor fixing hole (31), the second reserved device hole (32), the third reserved device hole (33), the aeration pump fixing hole (34) and the LED illuminating lamp fixing hole (35) are formed in the third heating plate (3), the liquid level sensor is placed in the liquid level sensor fixing hole (31), the LED illuminating lamp is placed in the LED illuminating lamp fixing hole (35), the aeration pump is placed in the aeration pump fixing hole (34), and the second reserved device hole (32) and the third reserved device hole (33) are reserved hole sites respectively;
the edges of the first heating plate (1), the second heating plate (2), the third heating plate (3) and the fourth heating plate (4) are respectively provided with a fixed heat dissipation hole (5) and a wire guide hole (6), the fixed heat dissipation holes (5) are used for fixing the heating plates and enabling the heating plates to dissipate heat, and the wire guide holes (6) are used for being connected with wires in the heating plates;
a signal conditioning circuit and an AD conversion circuit are arranged between the temperature sensor and a controller of the biochemical oxygen demand detection device (7), and the temperature read by the temperature sensor can be received by the controller after passing through the signal conditioning circuit and the AD conversion circuit.
2. Thermostat device according to claim 1, characterized in that the lower two corners of the first heating plate (1), the second heating plate (2), the third heating plate (3) and the fourth heating plate (4) are each provided with the wire guide (6) in their respective positions, which take on an obtuse-angled shape.
3. Thermostat device according to claim 1, characterized in that the first heating plate (1), the second heating plate (2), the third heating plate (3) and the fourth heating plate (4) are provided with fixed heat dissipation holes (5) on both sides of the upper two corners and the lower middle position, respectively.
4. The thermostat according to claim 1, characterized in that the first heating plate (1), the second heating plate (2), the third heating plate (3) and the fourth heating plate (4) are respectively circuit boards printed by self-drawing PCB patterns, and copper wires are distributed on the boards.
5. A thermostat according to claim 1 wherein the temperature sensor is a PT100 temperature sensor.
6. A thermostat according to claim 1 wherein the voltage of the two-position three-way valve is 12V.
7. The thermostat of claim 1, wherein the water sample inlet pipe to be measured is a rubber pipe.
8. Thermostat device according to claim 1, characterized in that the hole sizes of the first (23), second (32) and third (33) reserved device holes are hole sites M6, in which a back taper joint is placed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223228500.XU CN219590289U (en) | 2022-12-03 | 2022-12-03 | Constant temperature device for detecting biochemical oxygen demand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223228500.XU CN219590289U (en) | 2022-12-03 | 2022-12-03 | Constant temperature device for detecting biochemical oxygen demand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219590289U true CN219590289U (en) | 2023-08-25 |
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ID=87696827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223228500.XU Active CN219590289U (en) | 2022-12-03 | 2022-12-03 | Constant temperature device for detecting biochemical oxygen demand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219590289U (en) |
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2022
- 2022-12-03 CN CN202223228500.XU patent/CN219590289U/en active Active
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