Metallurgical furnace water cooling water jacket detection device and use method thereof

Abstract

The invention discloses a metallurgical furnace water cooling water jacket heat exchange efficiency detection device which comprises a heat preservation shell, a heat transfer plate, a heating resistor and a controller. Wherein the heat preservation shell is provided with a water inlet temperature detector and a water outlet temperature detector, and a cavity is formed in the heat preservation shell; the heating resistor penetrates into the cavity; the heat transfer plate is arranged at the top of the heat insulation shell, the bottom is communicated with the cavity for heat conduction, and the top is used for placing a water-cooling water jacket to be detected; the controller is arranged on the side edge of the heat preservation shell and connected with the water inlet temperature detector and the water outlet temperature detector. By detecting the water jacket, unqualified water-cooled parts can be eliminated in advance, so that the safety risk in the production process can be remarkably reduced, and the product quality and stability can be ensured; the potential accident rate is reduced, the production process is optimized, and the maintenance and replacement cost is reduced, so that the comprehensive reduction of the production cost is realized.

Description

Technical Field

[0001] The invention relates to the technical field of water-cooling jackets of metallurgical furnaces, and in particular to a detection device for the water-cooling jacket of a metallurgical furnace and a use method thereof. Background Art

[0002] In the metallurgical industry, high-temperature working environments place extremely high demands on the stability and reliability of equipment. As an indispensable component of metallurgical equipment, the performance of water-cooled jackets directly affects the operating efficiency and safety of the equipment. Therefore, quality inspection of water-cooled components is extremely important. Traditional water-cooled jacket inspection methods rely heavily on manual inspections and regular maintenance, which is not only inefficient, but also difficult to inspect the performance of water-cooled jackets before installation. In addition, due to the particularity of the working environment of metallurgical equipment, water-cooled components may be affected by various factors such as high temperature, high pressure, and corrosion, which accelerates their aging and damage. Water-cooled jackets with poor heat exchange efficiency are prone to failure. Once a water-cooled component fails, it may cause equipment overheating, damage, or even cause a safety accident, causing huge economic losses and casualties to the company.

[0003] In order to solve these problems, it is particularly important to develop an efficient and accurate water-cooling jacket detection device. This detection device needs to detect the working status of the water-cooling components during the installation phase and discover potential safety hazards in a timely manner. Summary of the invention

[0004] In view of the above-mentioned shortcomings that it is impossible to detect the heat exchange efficiency of the water jacket before installation and direct use may affect production, the present invention proposes a water-cooled water jacket detection device for metallurgical furnaces and a method for using the same. The application of the device can not only quickly and effectively screen out water-cooled water jackets with problems, ensuring that the heat exchange efficiency of the water-cooled water jackets used for installation meets the requirements, but also reduce the frequency of shutdowns for maintenance, significantly improve the operating efficiency of metallurgical furnaces, and provide a strong guarantee for safe production in the metallurgical industry.

[0005] To achieve the above object, the technical solution of the present invention is as follows: A device for detecting the heat exchange efficiency of a water-cooled jacket of a metallurgical furnace comprises an insulation shell, a heat transfer plate, a heating resistor and a controller; wherein an inlet water temperature detector is provided at the top of one side of the insulation shell, and an outlet water temperature detector is provided at the bottom of the other opposite side, and a cavity is provided inside the insulation shell; there are a plurality of heating resistors, which are respectively inserted into the cavity, and the two ends of the heating resistors are respectively connected to the insulation shell; the heat transfer plate is arranged at the top of the insulation shell, and the bottom of the heat transfer plate passes through the insulation shell to be connected with the cavity for heat conduction, and the top is used for placing the water-cooled jacket to be detected; the controller is arranged on the side of the insulation shell, and the controller is respectively connected to the inlet water temperature detector and the outlet water temperature detector.

[0006] Furthermore, the insulation shell includes a stainless steel shell, insulation cotton and refractory bricks; the refractory bricks have a plurality of pieces, and the plurality of refractory bricks build a frame structure with a cavity; the outer periphery of the refractory bricks is wrapped; the stainless steel shell is wrapped on the outside of the insulation cotton; the heating resistor penetrates into the cavity from the side, and the two ends of the heating resistor are connected to the stainless steel shell. The insulation shell adopts a multi-layer structure, which can effectively reduce heat loss and keep the internal temperature stable. The frame structure built by the refractory bricks provides good physical support, ensuring the overall structural stability and durability of the insulation shell. The stainless steel shell not only enhances the mechanical strength of the insulation shell, but also facilitates cleaning and maintenance, and prolongs the service life. The heating resistor penetrates into the cavity from the side and is connected to the stainless steel shell, which can achieve uniform heating and ensure uniform temperature distribution inside the insulation shell. At the same time, the combined use of refractory bricks and insulation cotton not only improves the insulation effect, but also prevents the influence of the external environment on the internal temperature, thereby increasing safety.

[0007] Furthermore, the stainless steel shell is made of 316 stainless steel; and the refractory bricks are made of magnesia-chrome bricks.

[0008] Furthermore, the heat transfer plate includes a copper plate and a plurality of heat-conducting rods, wherein the bottom of the copper plate is evenly connected to the tops of the plurality of heat-conducting rods; the bottom of the heat-conducting rod passes through the top of the insulation shell, communicates with the cavity of the insulation shell, and conducts the heat inside the cavity to the copper plate. The use of the copper plate and the heat-conducting rod can achieve fast and efficient heat conduction, ensuring that the heat is quickly transferred to the cavity of the insulation shell. The design of the heat-conducting rod can adjust the length according to actual needs to adapt to insulation shells of different thicknesses or space requirements of different sizes; the heat-conducting rods are evenly distributed on the bottom of the copper plate to ensure uniform heat distribution, which is beneficial to improving the overall heat conduction efficiency. At the same time, since the heat-conducting rod can pass through the top of the insulation shell, it is convenient for installation and subsequent maintenance or replacement.

[0009] Furthermore, the bottom of the heat-insulating shell is provided with directional wheels that can be easily moved. The wheels can facilitate the movement of the device and make it easy to use.

[0010] Furthermore, the water inlet temperature detector and the water outlet temperature detector are both temperature sensors, which are accurate and stable in measuring temperature and have good use effects.

[0011] Furthermore, the controller is also connected to a buzzer. The inlet water temperature detector, the outlet water temperature detector and the controller are connected in series to form a device interlock. A warning value is set inside the controller. When the temperature difference exceeds the value, the buzzer is turned on within 500 milliseconds. At this time, the buzzer sounds an alarm, which can promptly remind the staff that the water jacket is unqualified, making it convenient for the staff to eliminate the unqualified water jacket.

[0012] A method for using a metallurgical furnace water-cooling jacket detection device comprises the following steps: S1: Place the water jacket to be tested on the top of the heat transfer plate, then connect the water inlet of the water jacket to the water inlet temperature detector and the factory's furnace body circulating water pipeline, connect the water outlet of the water jacket to the water outlet temperature detection device and the factory's furnace body circulating water pipeline, open the furnace body circulating water pipeline, and keep water circulating in the water jacket; S2: Turn on the heating resistor, which heats up the cavity quickly. At the same time, the heat transfer plate conducts heat transfer to the water jacket at the top to simulate the working environment of the water jacket. S3: The controller collects the temperatures of the water inlet temperature detector and the water outlet temperature detector respectively, records the data detected by the water inlet temperature detector as t1, and the data detected by the water outlet temperature detector as t2, and then calculates the temperature difference between the water inlet and the water outlet of the water jacket, and the temperature difference is recorded as ∆t; S4: Combined with the heat transfer calculation formula of the fluid, Q=K*F*∆t, where Q is the heat transfer of the fluid, F is the water channel heat exchange area, and ∆t is the temperature difference between the water inlet and the water outlet of the water jacket. Because the amount of cooling water supplied to the water inlet point is constant during the detection, the water jacket water channel of the same water jacket is the same, and the water channel heat exchange area F is consistent, so it can be considered that the heat transfer of water Q is roughly the same. Therefore, according to the formula, the temperature ∆t is inversely proportional to the heat exchange efficiency K, so when the detected temperature difference ∆t is large, the corresponding heat exchange efficiency is low; according to the heat exchange efficiency requirements, when the temperature difference is 10℃, the heat exchange efficiency just meets the production use, and when the temperature difference is greater than 10℃, the heat exchange efficiency does not meet the actual production requirements. Therefore, the water jacket with a temperature difference ∆t greater than 10℃ is regarded as a defective product, and it can be screened out to complete the water jacket detection, and then quickly screen out unqualified water jackets.

[0013] The working principle of the patent of this invention is as follows: the heating resistor provides heat to the device, the insulation cotton and refractory bricks insulate the device cavity, and finally the heat is conducted to the connecting copper plate by the heat conducting rod; the water inlet and outlet of the water jacket to be tested are connected to the furnace circulating water and connected to the device inlet and outlet and water temperature detection device, the water jacket contacts the heated copper plate for heat conduction, and the temperature difference between the water inlet and outlet of the water jacket is used to quickly detect whether the water jacket is qualified.

[0014] The detection principle is: the heat transfer calculation formula Q=K*F*∆t, where Q is the heat transfer of the fluid, F is the water channel heat exchange area, and ∆t is the temperature difference between the water inlet and the water outlet of the water jacket; because the amount of cooling water supplied to the water inlet point is constant during the detection, the water channels of the same water jacket are the same, and the water channel heat exchange area F is consistent, so it can be considered that the heat transfer of water Q is roughly the same. Therefore, according to the formula, the temperature ∆t is inversely proportional to the heat exchange efficiency K, so when the detected temperature difference ∆t is large, the corresponding heat exchange efficiency is low; combined with actual conditions, the smaller the temperature difference of the water jacket, the greater the heat exchange efficiency. Comprehensively considering the working conditions of the water jacket application, it is generally believed that when the inlet and return water temperature difference of the water jacket is less than or equal to 10°C, the heat exchange efficiency of the water jacket can meet the actual application requirements. Therefore, screening out water jackets with large temperature differences during detection can ensure that the water jacket is qualified.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The present invention can eliminate unqualified water-cooling parts in advance through the detection of water jackets, which can significantly reduce the safety risks in the production process and ensure product quality and stability; this not only reduces the potential accident rate, but also optimizes the production process, reduces the cost of maintenance and replacement, thereby achieving an overall reduction in production costs; in addition, through strict screening, the reliability of the water jacket in long-term use is guaranteed, which can bring greater economic benefits to the enterprise.

[0016] 2. The insulation shell of the present invention adopts a multi-layer structure, which can keep the internal temperature stable. The combined use of refractory bricks and insulation cotton not only improves the insulation effect, but also prevents the influence of the external environment on the internal temperature, thereby increasing safety; the heating resistor penetrates into the cavity from the side and is connected to the stainless steel shell, which can achieve uniform heating and ensure uniform temperature distribution inside the insulation shell; the heat transfer plate composed of the copper plate and the heat conducting rod group can achieve fast and efficient heat conduction, ensuring that heat is quickly transferred to the cavity of the insulation shell; the buzzer connected to the controller can give a timely reminder when a bad water jacket is detected, which is convenient for detection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a main structural schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the top structure of the present invention.

[0019] Figure ID: 1- direction-changing wheel, 2- water outlet temperature detector, 3- stainless steel shell, 4- thermal insulation cotton, 5- refractory brick, 6- heating resistor, 7- heat transfer plate, 71- copper plate, 72- heat conducting rod, 8- water inlet temperature detector, 9- water jacket, 10- water inlet, 11- water outlet, 12- controller. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings.

[0021] Embodiment 1: A water-cooled jacket detection device for a metallurgical furnace comprises an insulation shell, a heat transfer plate 7, a heating resistor 6 and a controller 12; wherein an inlet water temperature detector 8 is provided at the top of one side of the insulation shell, and an outlet water temperature detector 2 is provided at the bottom of the other opposite side, and a cavity is provided inside the insulation shell; there are a plurality of heating resistors 6, and the plurality of heating resistors 6 are respectively inserted into the cavity, and the two ends of the heating resistor 6 are respectively connected to the insulation shell; the heat transfer plate 7 is arranged at the top of the insulation shell, and the bottom of the heat transfer plate 7 passes through the insulation shell to be connected with the cavity for heat conduction, and the top is used for placing the water-cooled jacket 9 to be detected; the controller 12 is arranged on the side of the insulation shell, and the controller 12 is respectively connected to the inlet water temperature detector 8 and the outlet water temperature detector 2.

[0022] A method for using a heat exchange efficiency detection device for a water-cooling jacket 9 of a metallurgical furnace comprises the following steps: S1: Place the water jacket 9 to be tested on the top of the heat transfer plate 7, then connect the water inlet 10 of the water jacket 9 to the water inlet temperature detector 8 and the factory's furnace body circulating water pipeline, connect the water outlet 11 of the water jacket 9 to the water outlet temperature detection device and the factory's furnace body circulating water pipeline, open the furnace body circulating water pipeline, and keep water circulating in the water jacket 9; S2: Turn on the heating resistor 6, which heats up the cavity and heats it up quickly. At the same time, the heat transfer plate 7 transfers heat to the water jacket 9 at the top to simulate the working environment of the water jacket 9. S3: The controller 12 collects the temperatures of the water inlet temperature detector 8 and the water outlet temperature detector 2 respectively, records the data detected by the water inlet temperature detector 8 as t1, and the data detected by the water outlet temperature detector 2 as t2, and then calculates the temperature difference between the water inlet 10 and the water outlet 11 of the water jacket 9, and the temperature difference is recorded as ∆t; S4: Combined with the heat transfer calculation formula of the fluid, Q=K*F*∆t, where Q is the heat transfer of the fluid, F is the water channel heat exchange area, and ∆t is the temperature difference between the water inlet 10 and the water outlet 11 of the water jacket 9. Because the amount of cooling water supplied by the water inlet point is constant during the detection, the water channels of the same water jacket 9 are the same, and the water channel heat exchange area F is consistent, so it can be considered that the heat transfer of water Q is roughly the same. Therefore, according to the formula, the temperature ∆t is inversely proportional to the heat exchange efficiency K, so when the detected temperature difference ∆t is large, the corresponding heat exchange efficiency is low; according to the heat exchange efficiency requirements, when the temperature difference is 10℃, the heat exchange efficiency just meets the production use, and when the temperature difference is greater than 10℃, the heat exchange efficiency does not meet the actual production requirements. Therefore, the water jacket 9 with a temperature difference ∆t greater than 10℃ is regarded as a defective product, and it is screened out to complete the detection of the water jacket 9, and then the unqualified water jacket 9 can be quickly screened out.

[0023] The working principle of the patent of the present invention is as follows: the heating resistor 6 provides heat for the device, the insulation cotton 4 and the refractory bricks 5 insulate the cavity of the device, and finally the heat is conducted to the connecting copper plate 71 by the heat conducting rod 72; the water inlet and outlet 11 of the water jacket 9 to be tested are connected to the circulating water of the furnace body and connected to the device inlet and outlet and water temperature detection device, the water jacket 9 contacts the heated copper plate 71 for heat conduction, and the temperature difference between the water inlet 10 and the water outlet 11 of the water jacket 9 is used to quickly detect whether the water jacket 9 is qualified.

[0024] The detection principle is as follows: the heat transfer calculation formula Q=K*F*∆t, where Q is the heat transfer of the fluid, F is the water channel heat exchange area, and ∆t is the temperature difference between the water inlet 10 and the water outlet 11 of the water jacket 9; because the amount of cooling water supplied to the water inlet point is constant during detection, the water channels of the same water jacket 9 are the same, and the water channel heat exchange area F is consistent, so it can be considered that the heat transfer amount Q of the water is roughly the same. Therefore, according to the formula, it can be seen that the temperature ∆t is inversely proportional to the heat exchange efficiency K, so when the detected temperature difference ∆t is large, the corresponding heat exchange efficiency is low; combined with actual conditions, the smaller the temperature difference of the water jacket 9, the greater the heat exchange efficiency. Comprehensively considering the working conditions of the water jacket 9, it is generally believed that when the inlet and return water temperature difference of the water jacket 9 is less than or equal to 10°C, the heat exchange efficiency of the water jacket 9 can meet the actual application requirements. Therefore, screening out the water jacket 9 with a large temperature difference during detection can ensure that the water jacket 9 is qualified.

[0025] Embodiment 2: The difference from Embodiment 1 is that the insulation shell includes a stainless steel shell 3, insulation cotton 4 and refractory bricks 5; the refractory bricks 5 have several pieces, and the several pieces of refractory bricks 5 build a frame structure with a cavity; the outer periphery of the refractory bricks 5 is wrapped; the stainless steel shell 3 is wrapped on the outside of the insulation cotton 4; the heating resistor 6 penetrates into the cavity from the side, and the two ends of the heating resistor 6 are connected to the stainless steel shell 3. The insulation shell adopts a multi-layer structure, which can effectively reduce heat loss and keep the internal temperature stable. The frame structure built by the refractory bricks 5 provides good physical support, ensuring the overall structural stability and durability of the insulation shell. The stainless steel shell 3 not only enhances the mechanical strength of the insulation shell, but also facilitates cleaning and maintenance, and prolongs the service life. The heating resistor 6 penetrates into the cavity from the side and is connected to the stainless steel shell 3, which can achieve uniform heating and ensure uniform temperature distribution inside the insulation shell. At the same time, the combined use of refractory bricks 5 and insulation cotton 4 not only improves the insulation effect, but also prevents the influence of the external environment on the internal temperature, thereby increasing safety.

[0026] The stainless steel shell 3 is made of 316 stainless steel; the refractory bricks 5 are made of magnesia-chrome bricks.

[0027] The heat transfer plate 7 includes a copper plate 71 and a plurality of heat-conducting rods 72, wherein the bottom of the copper plate 71 is evenly connected to the tops of the plurality of heat-conducting rods 72; the bottom of the heat-conducting rods 72 passes through the top of the insulation shell, communicates with the cavity of the insulation shell, and conducts the heat inside the cavity to the copper plate 71. The use of the copper plate 71 and the heat-conducting rods can achieve fast and efficient heat conduction, ensuring that the heat is quickly transferred to the cavity of the insulation shell. The design of the heat-conducting rods 72 can adjust the length according to actual needs to adapt to insulation shells of different thicknesses or space requirements of different sizes; the heat-conducting rods are evenly distributed at the bottom of the copper plate 71 to ensure uniform heat distribution, which is beneficial to improving the overall heat conduction efficiency. At the same time, since the heat-conducting rods can pass through the top of the insulation shell, it is convenient for installation and subsequent maintenance or replacement.

[0028] The bottom of the heat-insulating shell is provided with a reversing wheel 1 that can be easily moved. The wheel can facilitate the device to move and is convenient to use.

[0029] The water inlet temperature detector 8 and the water outlet temperature detector 2 are both temperature sensors, which are accurate and stable in measuring temperature and have good use effects.

[0030] The controller 12 is also connected to a buzzer. The inlet water temperature detector 8, the outlet water temperature detector 2 and the controller 12 are connected in series to form a device interlock. A warning value is set inside the controller 12. When the temperature difference exceeds the value, the buzzer is turned on within 500 milliseconds. At this time, the buzzer sounds an alarm, which can promptly remind the staff that the water jacket 9 is unqualified, so that the staff can eliminate the unqualified water jacket 9.

[0031] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A metallurgical furnace water cooling jacket detection device, characterized in that: The invention comprises a heat-insulating shell, a heat-transfer plate (7), a heating resistor (6) and a controller (12); wherein a water inlet temperature detector (8) is provided at the top of one side of the heat-insulating shell, a water outlet temperature detector (2) is provided at the bottom of the other side opposite thereto, and a cavity is provided inside the heat-insulating shell; the heating resistors (6) are provided in a plurality, the plurality of heating resistors (6) are respectively inserted into the cavity, and the two ends of the heating resistors (6) are respectively connected to the heat-insulating shell; the heat-transfer plate (7) is provided at the top of the heat-insulating shell, and the bottom of the heat-transfer plate (7) is connected to the cavity after passing through the heat-insulating shell for heat conduction, and the top is used for placing a water-cooling jacket (9) to be detected; the controller (12) is provided at the side of the heat-insulating shell, and the controller (12) is respectively connected to the water inlet temperature detector (8) and the water outlet temperature detector (2).

2. A metallurgical furnace water-cooling jacket detection device as claimed in claim 1, characterized in that: The heat-insulating shell comprises a stainless steel shell (3), heat-insulating cotton (4) and refractory bricks (5); the refractory bricks (5) are provided with a plurality of pieces, and the plurality of refractory bricks (5) form a frame structure with a cavity; the refractory bricks (5) are wrapped around the outer periphery; the stainless steel shell (3) is wrapped around the outer side of the heat-insulating cotton (4); the heating resistor (6) penetrates into the cavity from the side, and the two ends of the heating resistor (6) are connected to the stainless steel shell (3). The insulation shell adopts a multi-layer structure, which can effectively reduce heat loss and maintain the internal temperature stable. The frame structure constructed by the refractory bricks (5) provides good physical support, ensuring the overall structural stability and durability of the insulation shell. The stainless steel shell (3) not only enhances the mechanical strength of the insulation shell, but also facilitates cleaning and maintenance, thereby extending the service life. The heating resistor (6) penetrates into the cavity from the side and is connected to the stainless steel shell (3), which can achieve uniform heating and ensure uniform temperature distribution inside the insulation shell. At the same time, the combined use of the refractory bricks (5) and the insulation cotton (4) not only improves the insulation effect, but also prevents the external environment from affecting the internal temperature, thereby increasing safety.

3. A metallurgical furnace water-cooling jacket detection device as claimed in claim 2, characterized in that: The stainless steel shell (3) is made of 316 stainless steel; and the refractory bricks (5) are made of magnesia-chrome bricks.

4. A metallurgical furnace water-cooling jacket detection device as claimed in any one of claim 1, characterized in that: The heat transfer plate (7) comprises a copper plate (71) and a plurality of heat conducting rods (72), wherein the bottom of the copper plate (71) is evenly connected to the tops of the plurality of heat conducting rods (72); the bottoms of the heat conducting rods (72) pass through the top of the heat insulation shell and are connected to the cavity of the heat insulation shell, thereby conducting heat inside the cavity to the copper plate (71).

5. A metallurgical furnace water-cooling jacket detection device as claimed in claim 1, characterized in that: The bottom of the heat-insulating shell is provided with direction-changing wheels (1) that can be easily moved.

6. A metallurgical furnace water-cooling jacket detection device as claimed in claim 1, characterized in that: The water inlet temperature detector (8) and the water outlet temperature detector (2) both adopt temperature sensors.

7. A method for using a device for detecting heat exchange efficiency of a water-cooled jacket of a metallurgical furnace as claimed in any one of claims 1 to 6, comprising the following steps: S1: placing the water jacket (9) to be tested on the top of the heat transfer plate (7), then connecting the water inlet (10) of the water jacket (9) to the water inlet temperature detector (8) and the factory furnace body circulating water pipeline, connecting the water outlet (11) of the water jacket (9) to the water outlet temperature detection device and the factory furnace body circulating water pipeline, and opening the furnace body circulating water pipeline to keep water circulating in the water jacket (9); S2: Turn on the heating resistor (6), the heating resistor (6) heats up, causing the temperature inside the cavity to rise rapidly, and at the same time the heat transfer plate (7) transfers heat to the water jacket (9) at the top, simulating the working environment of the water jacket (9); S3: The controller (12) collects the temperatures of the water inlet temperature detector (8) and the water outlet temperature detector (2), respectively, records the data detected by the water inlet temperature detector (8) as t1, and the data detected by the water outlet temperature detector (2) as t2, and then calculates the temperature difference between the water inlet (10) and the water outlet (11) of the water jacket (9), and the temperature difference is recorded as ∆t; S4: Combined with the heat transfer calculation formula of the fluid, Q=K*F*∆t, where Q is the heat transfer of the fluid, F is the water channel heat exchange area, and ∆t is the temperature difference between the water inlet (10) and the water outlet (11) of the water jacket (9). Since the amount of cooling water supplied to the water inlet point is constant during the detection, the water channels of the same water jacket (9) are the same, and the water channel heat exchange area F is consistent, it can be considered that the heat transfer of water Q is roughly the same. Therefore, according to the formula, it can be seen that the temperature ∆t is inversely proportional to the heat transfer efficiency K. Therefore, when the detected temperature difference ∆t is large, the corresponding heat transfer efficiency is low; according to the heat transfer efficiency requirement, when the temperature difference is 10°C, the heat transfer efficiency just meets the production use. When the temperature difference is greater than 10°C, the heat transfer efficiency does not meet the actual production requirements. Therefore, the water jacket (9) with a temperature difference ∆t greater than 10°C is regarded as a defective product and is screened out. The detection of the water jacket (9) can be completed, and the unqualified water jacket (9) can be quickly screened out.

Images