Heat dissipation device of diaphragm pump and heat dissipation capacity calculation method

Abstract

The invention relates to a heat dissipation device of a diaphragm pump and a heat dissipation capacity calculation method, and solves the problem of continuous heating of the diaphragm pump in operation by adopting a heat dissipation strategy of intermittent alternation of natural convection and forced convection. According to the heat dissipation device of the diaphragm pump, the discontinuous heat dissipation fins are arranged on the outer surface of the cylindrical heat dissipation area of the diaphragm pump and used for conducting heat dissipation on the diaphragm pump, natural convection heat dissipation is conducted on the heating surface of the diaphragm pump through the discontinuous heat dissipation fins, and the working temperature of the pump is kept within a reasonable range; according to the natural cooling heat dissipation module, stable operation of the pump is ensured, the discontinuous heat dissipation fins have very high performance in the natural cooling heat dissipation module, and the discontinuous heat dissipation fins can delay discontinuous surfaces of the fins added due to the appearance of a thermal boundary layer, so that the total heat transfer rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation structures, and in particular to a heat dissipation device of a diaphragm pump and a method for calculating the heat dissipation. Background Art

[0002] Pressurization devices such as low-frequency oscillation therapy devices and sphygmomanometers use the spontaneous fluctuations of arterial pressure and blood flow for treatment. The principle is based on the regulation of hemodynamics to promote the transport and diffusion of blood in capillaries. The diaphragm pump intermittently inflates and deflates the airbag and regularly squeezes the patient's limbs to simulate the natural blood flow of the human body and promote blood circulation. This treatment method has shown the potential to improve oxygen uptake, protect tissue perfusion, and accelerate the clearance of cerebral interstitial fluid. It is particularly effective in treating traumatic hemorrhage, sepsis, stroke, or recovery after cardiac arrest. Most of the existing heat dissipation devices for diaphragm pumps require external air cooling or water cooling devices, which will increase additional power consumption and floor space, and the cost will also increase accordingly. For example: Patent application with publication number CN218895544U discloses a heat pump heat dissipation structure and a heat pump unit, which uses a fan and heat dissipation fins to form a shell to dissipate heat for the heat pump, which additionally increases the power of the equipment and occupies a larger space; Patent application with publication number CN 114151323 A discloses a heat dissipation structure for a diaphragm pump, which uses a diaphragm device to drive the cooling medium to circulate continuously in the cooling channel to enable the diaphragm pump to dissipate heat, and has high production costs and safety issues related to the risk of leakage. Summary of the invention

[0003] The present invention provides a heat dissipation device for a diaphragm pump, which adopts a heat dissipation strategy of intermittent alternation of natural convection and forced convection to solve the problem of continuous heating encountered by the diaphragm pump during operation.

[0004] The technical solution of the present invention to solve the above problems is:

[0005] The present invention provides a heat dissipation device for a diaphragm pump, which is special in that:

[0006] The cylindrical heat dissipation area of ​​the diaphragm pump is provided with intermittent heat dissipation fins on its outer surface for dissipating heat from the diaphragm pump. The intermittent heat dissipation fins are used to dissipate heat from the heating surface of the diaphragm pump by natural convection, so that the operating temperature of the pump is kept within a reasonable range, ensuring the stable operation of the pump. The intermittent heat dissipation fins have very high performance in the natural cooling heat dissipation module, because the intermittent heat dissipation fins can delay the addition of the discontinuous surface of the fins due to the appearance of the thermal boundary layer, thereby increasing the total heat transfer rate.

[0007] Furthermore, the discontinuous heat dissipation fins are divided into multiple rows, and each row includes a plurality of heat dissipation fins.

[0008] Furthermore, each row of heat dissipation fins is equidistantly distributed on the circumference of the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump.

[0009] Furthermore, there is a distance between two adjacent rows of heat dissipation fins.

[0010] Furthermore, the heat dissipation fins are of a rectangular structure.

[0011] Furthermore, the heat dissipation fins are radially arranged on the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump.

[0012] Furthermore, the bottom of the heat sink fin is adhered to the outer surface of the cylindrical heat sink area of ​​the diaphragm pump through silicone grease. The heat sink and the heat generating area of ​​the diaphragm pump are closely fitted through the high thermal conductivity silicone grease, so as to achieve the best heat dissipation effect.

[0013] Furthermore, the high-pressure gas in the gas storage container is discharged through the vent of the pressure-stabilizing valve and then introduced into the vertical surface of the heat sink fins. Intermittent forced convection heat dissipation is performed through the released high-pressure air to enhance the heat dissipation capacity of the heat sink.

[0014] Furthermore, at the same time, the high-pressure gas pumped into the sleeve in the air storage container is introduced into the vertical surface of the heat sink fin through the air release valve, and intermittent forced convection heat dissipation is performed through the released high-pressure air to enhance the heat dissipation capacity of the heat sink.

[0015] Furthermore, the optimal heat sink fin spacing S opt Determined by the following formula:

[0016]

[0017] Where g is the acceleration due to gravity, β is the coefficient of thermal expansion, α is the thermal diffusivity, ν is the dynamic viscosity, and Τ w is the wall temperature, T ∞ is the ambient temperature.

[0018] In addition, the present invention also proposes a method for calculating the heat dissipation of the heat dissipation device of the diaphragm pump, which is special in that:

[0019] First calculate the inlet velocity of the first row of heat sink fins:

[0020]

[0021] Substitute the following formula to find the heat transfer coefficient of the first row of heat sink fins:

[0022]

[0023] The thermal conductivity k is 0.0262W / m·K;

[0024] Substitute the result into the following formula to find the heat flux q1, knowing that the inlet temperature of the first row is equal to the ambient temperature T in,C,1 =T ∞ :

[0025] q1=h1(T w -T in,C,1 )

[0026] Then, the inlet velocity of the second row of heat sink fins is obtained from the inlet velocity of the first row of heat sink fins using the empirical formula:

[0027] u C,in,2 =u C,in,1 ·e -λG

[0028] Where λ is the fitting constant, and its value is between 94 and 96;

[0029] By analogy, the heat transfer coefficient and heat flux density of each row of heat sink fins can be obtained, and then the total heat flux density q and the total heat transfer amount Q can be calculated using the following two formulas:

[0030]

[0031] Q=Aq

[0032] Where A is the total heat dissipation area, A = 2mnlH,

[0033] From this, the total heat dissipation of the heat sink fins under natural convection can be calculated.

[0034] Advantages of the present invention:

[0035] The present invention provides a diaphragm pump heat dissipation device with a simple structure and a small size. Intermittently arranged heat dissipation fins are attached to the heating surface of the diaphragm pump with thermal conductive adhesive to dissipate natural convection heat therefrom, and the diaphragm pump in the pressurizing device is cooled, so that the working temperature of the pump is maintained within a reasonable range, thereby ensuring stable operation of the pump. At the same time, the gas discharged from the air vent of the voltage stabilizer behind the diaphragm pump and the air vent of the cuff are led to the intermittent heat dissipation fins for intermittent forced convection heat dissipation, thereby increasing the heat transfer coefficient of the heat sink and enhancing the heat dissipation power, thereby saving additional air cooling or water cooling equipment for heat dissipation, reducing the size and power consumption of the heat dissipation module, improving the energy utilization rate of the equipment, and ensuring that the equipment can operate stably and safely during long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an expanded view of the cylindrical broken fin heat sink of the diaphragm pump's heat dissipation device;

[0037] Figure 2 It is a top view of a cylindrical broken fin heat sink;

[0038] Figure 3 It is a flow chart of an intermittent forced convection device based on the deflation of the pressure regulating valve and the deflation of the external cuff.

[0039] In the figure, 1, heat generation area; 2, heat dissipation fins. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0041] See also Figure 2 The present invention proposes a heat dissipation device for a diaphragm pump. The main heating area of ​​the diaphragm pump is in the cylindrical brush area, so the heat is mainly dissipated around this area. The cylindrical heating area 1 of the diaphragm pump is provided with intermittent heat dissipation fins 2 on the surface to dissipate the heat of the diaphragm pump. The intermittently arranged heat dissipation fins are used to dissipate the heat on the heating surface of the diaphragm pump by natural convection, so that the working temperature of the pump is kept within a reasonable range, ensuring the stable operation of the pump.

[0042] In some embodiments of the present invention, the discontinuous heat dissipation fins are divided into multiple rows, each row includes a plurality of heat dissipation fins, and each row of heat dissipation fins is evenly distributed around the outer circumference of the cylindrical heat dissipation area of ​​the diaphragm pump.

[0043] In some embodiments of the present invention, see Figure 1 and Figure 2 There is a distance between the two adjacent rows of heat sink fins. The discontinuous heat sink fins have very high performance in the natural cooling heat sink module because the discontinuous heat sink fins can delay the addition of the discontinuous surface of the fins due to the appearance of the thermal boundary layer, thereby increasing the overall heat transfer rate.

[0044] Specifically, see Figure 1 and Figure 2 The heat dissipation fins are rectangular in structure. The heat dissipation fins of the rectangular structure are radially arranged on the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump.

[0045] Specifically, the bottom of the heat sink fin is bonded to the outer surface of the cylindrical heat sink area of ​​the diaphragm pump through silicone grease. The heat sink and the heat generating area of ​​the diaphragm pump are closely fitted through the high thermal conductivity silicone grease, so as to achieve the best heat dissipation effect.

[0046] As a preferred embodiment of the present invention, in order to further enhance the heat dissipation capacity of the heat sink, reduce power consumption, and recover energy, the high-pressure gas in the gas storage container is discharged through the vent of the pressure-stabilizing valve and then introduced into the vertical surface of the heat sink fins. Intermittent forced convection heat dissipation is performed through the released high-pressure air to enhance the heat dissipation capacity of the heat sink.

[0047] As a preferred embodiment of the present invention, see Figure 3 The high-pressure gas in the air storage container is discharged through the vent of the pressure-stabilizing valve and then introduced into the vertical surface of the heat sink fins. At the same time, the high-pressure gas pumped into the sleeve in the air storage container is introduced into the vertical surface of the heat sink fins through the vent valve. The released high-pressure air is used for intermittent forced convection heat dissipation to enhance the heat dissipation capacity of the heat sink.

[0048] The diaphragm pump will continuously pump air into the air container when working. When the air pressure in the air container reaches the threshold value preset by the pressure regulating valve in the pressure regulator, the pressure regulating valve begins to discharge the gas with high pressure value, and the external cuff also needs to be continuously inflated and deflated to simulate the effect of natural blood flow. Therefore, the deflated air from the pressure regulating valve and the cuff is recovered and vertically introduced into the heat sink, resulting in forced convection on the surface of the heat sink, which improves the heat transfer coefficient and further enhances the heat dissipation capacity of the broken fin heat sink.

[0049] In addition, the present invention also proposes a method for calculating the optimal heat dissipation fin spacing s of the heat dissipation device of the diaphragm pump, which is special in that:

[0050] According to the distribution and size of the heating area of ​​the diaphragm pump, the specific heat sink parameters are determined under normal temperature and pressure conditions. The heat dissipation area of ​​the diaphragm pump is cylindrical, with an outer circumference of W, a width of L, a number of fin rows m, and a number of fin columns n. The geometric parameters of the fin height H, fin thickness t, fin length l, and gap length G are known. Substitute these determined heat sink size parameters into the following formula to calculate the optimal heat sink fin spacing S opt :

[0051]

[0052] Where g is the acceleration due to gravity, β is the coefficient of thermal expansion, α is the thermal diffusivity, ν is the dynamic viscosity, and Τ w is the wall temperature, T ∞ is the ambient temperature.

[0053] 2) Calculate the specific heat dissipation of the model

[0054] First calculate the inlet velocity of the first row of heat sink fins:

[0055]

[0056] Substitute the following formula to find the heat transfer coefficient of the first row of heat sink fins:

[0057]

[0058] The thermal conductivity k is 0.0262W / m·K;

[0059] Substitute the result into the following formula to find the heat flux q1, knowing that the inlet temperature of the first row is equal to the ambient temperature T in,C,1 =T ∞ :

[0060] q1=h1(T w -T in,C,1 )

[0061] Then, the inlet velocity of the second row of heat sink fins is obtained from the inlet velocity of the first row of heat sink fins using the empirical formula:

[0062] u C,in,2 =u C,in,1 ·e -λG

[0063] Where λ is the fitting constant, and its value is between 94 and 96;

[0064] By analogy, the heat transfer coefficient and heat flux density of each row of heat sink fins can be obtained, and then the total heat flux density q and the total heat transfer amount Q can be calculated using the following two formulas:

[0065]

[0066] Q=Aq

[0067] Where A is the total heat dissipation area, A = 2mnlH,

[0068] From this, the total heat dissipation of the heat sink fins under natural convection can be calculated.

[0069] In summary, the present invention proposes a heat dissipation device for devices containing diaphragm pump modules, such as sphygmomanometers, air pressure wave therapy devices, and low-frequency oscillation therapy devices, which adopts a heat dissipation strategy of intermittent alternation of natural convection and forced convection to solve the problem of continuous heating encountered by diaphragm pumps during operation. The present invention uses a discontinuously designed fin-shaped heat sink in close contact with the cylindrical heating surface of the pump, and optimizes heat dissipation by recycling excess high-pressure gas using the principles of natural convection and forced convection. In addition, the present invention introduces the air discharged from the front-end voltage regulator and the cuff vent into the heat sink to achieve intermittent forced convection heat dissipation. This dual heat dissipation mechanism not only improves the heat dissipation efficiency and keeps the device running within the ideal operating temperature range, but also reduces additional power consumption and saves energy. This technology significantly improves the operating efficiency and durability of the equipment by precisely controlling heat dissipation, ensuring the stability and safety of the equipment in long-term operation.

[0070] The above descriptions are merely embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related system fields, are also included in the protection scope of the present invention.

Claims

1. A heat dissipation device for a diaphragm pump, characterized in that: The cylindrical heat dissipation area of ​​the diaphragm pump is provided with discontinuous heat dissipation fins on its surface for dissipating heat from the diaphragm pump.

2. A heat dissipation device for a diaphragm pump according to claim 1, characterized in that: The discontinuous heat dissipation fins are divided into multiple rows, and each row includes a plurality of heat dissipation fins.

3. A heat dissipation device for a diaphragm pump according to claim 2, characterized in that: Each row of heat dissipation fins is evenly distributed on the circumference of the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump.

4. A heat dissipation device for a diaphragm pump according to claim 3, characterized in that: There is a distance between two adjacent rows of heat dissipation fins; the heat dissipation fins are of a rectangular structure.

5. The heat dissipation device of a diaphragm pump according to claim 4, characterized in that: The heat dissipation fins are radially arranged on the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump.

6. A heat dissipation device for a diaphragm pump according to claim 5, characterized in that: The bottom of the heat dissipation fin is adhered to the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump through silicone grease.

7. A heat dissipation device for a diaphragm pump according to claim 6, characterized in that: The high-pressure gas in the gas storage container is discharged through the vent of the pressure regulating valve and then introduced into the vertical surface of the heat dissipation fins. Intermittent forced convection heat dissipation is performed through the released high-pressure air.

8. The heat dissipation device of a diaphragm pump according to claim 7, characterized in that: The high-pressure gas pumped into the sleeve in the gas storage container is introduced into the vertical surface of the heat dissipation fins through the relief valve, and intermittent forced convection heat dissipation is performed through the released high-pressure air.

9. The heat dissipation device of a diaphragm pump according to claim 8, characterized in that: Optimal heat sink fin spacing S opt Determined by the following formula: Where g is the acceleration due to gravity, β is the coefficient of thermal expansion, α is the thermal diffusivity, ν is the dynamic viscosity, and Τ w is the wall temperature, T ∞ is the ambient temperature.

10. A method for calculating the heat dissipation of a diaphragm pump heat dissipation device according to claim 9, characterized in that: First calculate the inlet velocity of the first row of heat sink fins: Substitute the following formula to find the heat transfer coefficient of the first row of heat sink fins: The thermal conductivity k is 0.0262W / m·K; Substitute the result into the following formula to find the heat flux q1, knowing that the inlet temperature of the first row is equal to the ambient temperature T in,C,1 =T ∞ : q1=h1(T w -T in,C,1 ) Then, the inlet velocity of the second row of heat sink fins is obtained from the inlet velocity of the first row of heat sink fins using the empirical formula: in C,in,2 =in C,in,1 ·e -λG Where λ is the fitting constant, and its value is between 94 and 96; By analogy, the heat transfer coefficient and heat flux density of each row of heat sink fins can be obtained, and then the total heat flux density q and the total heat transfer amount Q can be calculated using the following two formulas: Q=Aq Where A is the total heat dissipation area, A = 2mnlH, From this, the total heat dissipation of the heat sink fins under natural convection can be calculated.

Images