A heat dissipation device for a diaphragm pump and a method for calculating heat dissipation.

Abstract

This invention relates to a heat dissipation device for a diaphragm pump and a method for calculating heat dissipation. It employs a heat dissipation strategy that alternates between natural convection and forced convection to solve the problem of continuous heat generation encountered by diaphragm pumps during operation. The heat dissipation device for the diaphragm pump proposed in this invention features intermittent heat dissipation fins on the outer surface of the cylindrical heat dissipation area for heat dissipation. The intermittently arranged heat dissipation fins facilitate natural convection heat dissipation on the heat-generating surface of the diaphragm pump, keeping the pump's operating temperature within a reasonable range and ensuring stable operation. The intermittent heat dissipation fins exhibit very high performance in natural cooling heat dissipation modules because they delay the addition of discontinuous fin surfaces due to the appearance of a thermal boundary layer, thereby increasing the overall heat transfer rate.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation structure technology, and specifically to a heat dissipation device for a diaphragm pump and a method for calculating heat dissipation. Background Technology

[0002] Low-frequency oscillation therapy devices and blood pressure monitors utilize the spontaneous fluctuations in arterial pressure and blood flow for treatment. Their principle is based on regulating hemodynamics to promote blood transport and diffusion in capillaries. By intermittently inflating and deflating a diaphragm pump, rhythmic pressure is applied to the patient's limbs to simulate natural blood flow and promote circulation. This treatment method has shown potential to improve oxygen uptake, protect tissue perfusion, and accelerate the clearance of cerebral interstitial fluid, and is particularly effective in treating traumatic hemorrhage, sepsis, and rehabilitation after stroke or cardiac arrest. Existing cooling devices for diaphragm pumps mostly require external air or water cooling systems, which increases power consumption, floor space, and cost. For example, patent application CN218895544U discloses a heat pump cooling structure and heat pump unit, which uses a fan and heat sink fins to form a shell to dissipate heat from the heat pump, which increases the power of the equipment and occupies a large space; patent application CN 114151323 A discloses a diaphragm pump cooling structure, which uses a diaphragm device to drive the cooling medium to continuously circulate in the cooling channel to dissipate heat from the diaphragm pump, which has high manufacturing costs and safety issues related to leakage risks. Summary of the Invention

[0003] This invention proposes a heat dissipation device for a diaphragm pump, which adopts a heat dissipation strategy of alternating natural convection and forced convection to solve the problem of continuous heat generation encountered by the diaphragm pump during operation.

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

[0005] This invention proposes a heat dissipation device for a diaphragm pump, which is characterized by:

[0006] The cylindrical heat dissipation area of ​​the diaphragm pump is equipped with intermittent heat dissipation fins for cooling the pump. These intermittent fins facilitate natural convection cooling of the pump's heating surface, maintaining the pump's operating temperature within a reasonable range and ensuring stable operation. The intermittent heat dissipation fins offer high performance in natural cooling modules because they delay the formation of discontinuous fin surfaces due to the thermal boundary layer, thereby increasing the overall heat transfer rate.

[0007] Furthermore, the intermittent heat dissipation fins are divided into multiple rows, with each row including several heat dissipation fins.

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

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

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

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

[0012] Furthermore, the bottom of the heat sink fins is adhered to the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump using silicone grease. The high thermal conductivity silicone grease ensures a tight fit between the heat sink and the heat-generating area of ​​the diaphragm pump, achieving optimal heat dissipation.

[0013] Furthermore, 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. The released high-pressure air is used for intermittent forced convection heat dissipation, thereby enhancing the heat dissipation capacity of the heat dissipation fins.

[0014] Furthermore, at the same time, the high-pressure gas injected into the sleeve in the gas storage container is introduced into the vertical surface of the heat dissipation fins through the vent valve. The released high-pressure air performs intermittent forced convection heat dissipation, thereby enhancing the heat dissipation capacity of the heat dissipation fins.

[0015] Furthermore, the optimal heatsink 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 is the coefficient of thermal expansion. w For the wall temperature, T ∞ 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 above-mentioned diaphragm pump, which is characterized by:

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

[0020]

[0021] Substitute the values ​​into the following formula to calculate the heat transfer coefficient of the first row of heat dissipation fins:

[0022]

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

[0024] Substitute the result into the following formula to calculate the heat flux density q1, given that the inlet temperature in 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, using empirical formulas, the inlet velocity of the second row of heat dissipation fins is calculated from the inlet velocity of the first row of heat dissipation fins:

[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 dissipation fins can be obtained. Then, the total heat flux density q and the total heat transfer 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] This allows us to calculate the total heat dissipation of the cooling fins under natural convection conditions.

[0034] Advantages of this invention:

[0035] This invention provides a simple and compact diaphragm pump cooling device. Intermittently arranged heat dissipation fins are attached to the heating surface of the diaphragm pump with thermally conductive adhesive for natural convection cooling, thus cooling the diaphragm pump within the pressurization device and maintaining the pump's operating temperature within a reasonable range to ensure stable operation. Simultaneously, the gas discharged from the vent of the voltage regulator after the diaphragm pump and the vent of the sleeve is directed to the intermittently arranged heat dissipation fins for intermittent forced convection cooling, increasing the heat transfer coefficient of the heat dissipation fins and enhancing the heat dissipation power. This saves on additional air-cooling or water-cooling equipment, reduces the size and power consumption of the cooling module, improves the energy utilization rate of the equipment, and ensures stable and safe operation of the equipment during long-term operation. Attached Figure Description

[0036] Figure 1 This is an unfolded diagram of the cylindrical broken-fin heat sink of the diaphragm pump's heat dissipation device;

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

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

[0039] In the diagram, 1 is the heat-generating area; 2 is the heat dissipation fins. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort 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 accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0041] See Figure 2 This invention proposes a heat dissipation device for a diaphragm pump. The main heat-generating area of ​​the diaphragm pump is in the cylindrical brush region, so heat dissipation is mainly carried out around this area. The cylindrical heat-generating area 1 of the diaphragm pump is provided with intermittent heat dissipation fins 2 for heat dissipation. The intermittently arranged heat dissipation fins allow natural convection heat dissipation on the heat-generating surface of the diaphragm pump, keeping the pump's operating temperature within a reasonable range and ensuring stable pump operation.

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

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

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

[0045] Specifically, the bottom of the heat sink fins is bonded to the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump using silicone grease. The high thermal conductivity silicone grease ensures a tight fit between the heat sink fins and the heat-generating area of ​​the diaphragm pump, achieving optimal heat dissipation.

[0046] In 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 regulating valve and then introduced into the vertical surface of the heat sink fins. The released high-pressure air is used for intermittent forced convection heat dissipation to enhance the heat dissipation capacity of the heat sink.

[0047] As a preferred embodiment of the present invention, see [link to previous document]. Figure 3 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. At the same time, the high-pressure gas injected into the sleeve in the gas storage container is introduced into the vertical surface of the heat dissipation fins through the vent valve. The released high-pressure air performs intermittent forced convection heat dissipation, thereby enhancing the heat dissipation capacity of the heat dissipation fins.

[0048] When the diaphragm pump is working, it continuously pumps air into the gas container. As the air pressure in the gas container reaches the threshold preset by the pressure regulating valve in the pressure regulator, the pressure regulating valve begins to discharge high-pressure gas. The external sleeve also needs to be continuously inflated and deflated to simulate the effect of natural blood flow. Therefore, the air vented from the pressure regulating valve and the sleeve is recovered and vertically introduced into the heat sink, causing forced convection on the surface of the heat sink, improving the heat transfer coefficient, and further enhancing the heat dissipation capacity of the finned 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 above-mentioned diaphragm pump, the special feature of which is:

[0050] Based on the distribution and size of the diaphragm pump's heating area, the specific heat sink parameters are determined under normal temperature and pressure conditions. The diaphragm pump's heat dissipation area base plate is cylindrical, with an outer circumference of W, a width of L, and a number of fin rows (m) and fin columns (n). Given the geometric parameters of the fin height H, fin thickness t, fin length l, and gap length G, these determined heat sink size parameters are substituted into the following formula to calculate the optimal 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 is the coefficient of thermal expansion. w For the wall temperature, T ∞ 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 dissipation fins:

[0055]

[0056] Substitute the values ​​into the following formula to calculate the heat transfer coefficient of the first row of heat dissipation fins:

[0057]

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

[0059] Substitute the result into the following formula to calculate the heat flux density q1, given that the inlet temperature in 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, using empirical formulas, the inlet velocity of the second row of heat dissipation fins is calculated from the inlet velocity of the first row of heat dissipation fins:

[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 dissipation fins can be obtained. Then, the total heat flux density q and the total heat transfer 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] This allows us to calculate the total heat dissipation of the cooling fins under natural convection conditions.

[0069] In summary, this invention proposes a heat dissipation device for devices containing diaphragm pump modules, such as blood pressure monitors, air pressure wave therapy devices, and low-frequency oscillation therapy devices. It employs a heat dissipation strategy that alternates between natural convection and forced convection, solving the problem of continuous heat generation encountered by diaphragm pumps during operation. This invention uses intermittently designed finned heat sinks closely attached to the cylindrical heating surface of the pump. By recovering excess high-pressure gas, it optimizes heat dissipation using the principles of natural and forced convection. Furthermore, this invention introduces air discharged from the front-end voltage regulator and the sleeve vent into the heat sink to achieve intermittent forced convection heat dissipation. This dual heat dissipation mechanism not only improves heat dissipation efficiency and maintains the device within the ideal operating temperature range but also reduces additional power consumption, saving energy. This technology, through precise heat dissipation control, significantly improves the operating efficiency and durability of the device, ensuring its stability and safety during long-term operation.

[0070] The above description is merely an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related system fields, are similarly included within the scope of protection 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 intermittent heat dissipation fins on its outer surface for heat dissipation. The discontinuous heat dissipation fins are divided into multiple rows, each row including several heat dissipation fins; Optimal heatsink fin spacing Determined by the following formula: Where g is the acceleration due to gravity. The coefficient of thermal expansion is... For thermal diffusivity, For dynamic viscosity, The wall temperature, The ambient temperature is L, and the width of the base plate is L.

2. The heat dissipation device for a diaphragm pump according to claim 1, characterized in that: Each row of heat dissipation fins is equidistantly distributed around the circumference of the cylindrical heat dissipation area of ​​the diaphragm pump.

3. The heat dissipation device for a diaphragm pump according to claim 2, characterized in that: There is a distance between adjacent rows of heat dissipation fins; the heat dissipation fins are rectangular in structure.

4. The heat dissipation device for a diaphragm pump according to claim 3, characterized in that: The heat dissipation fins are arranged radially on the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump.

5. The heat dissipation device for a diaphragm pump according to claim 4, characterized in that: The bottom of the heat dissipation fins is attached to the outer surface of the cylindrical heat dissipation area of ​​the diaphragm pump with silicone grease.

6. The heat dissipation device for a diaphragm pump according to claim 5, 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. The released high-pressure air is used for intermittent forced convection heat dissipation.

7. A heat dissipation device for a diaphragm pump according to claim 6, characterized in that: High-pressure gas injected into the sleeve from the gas storage container is introduced into the vertical surface of the heat dissipation fins through the vent valve, and intermittent forced convection heat dissipation is achieved through the released high-pressure air.

8. A method for calculating the heat dissipation of the heat dissipation device of the diaphragm pump according to claim 7, characterized in that: First, calculate the inlet velocity of the first row of heat dissipation fins: Substitute the values ​​into the following formula to calculate the heat transfer coefficient of the first row of heat dissipation fins: Where the thermal conductivity k is ; Substitute the result into the following formula to calculate the heat flux density. Given that the inlet temperature of the first row is equal to the ambient temperature. = : Then, using empirical formulas, the inlet velocity of the second row of heat dissipation fins is calculated from the inlet velocity of the first row of heat dissipation fins: in This is the fitting constant, with a value between 94 and 96. By analogy, the heat transfer coefficient and heat flux density of each row of heat dissipation fins can be obtained. Then, the total heat flux density can be calculated using the following two formulas. Total heat exchange : in A The total heat dissipation area, β: Coefficient of thermal expansion g Gravitational acceleration s : Spacing between heat dissipation fins, ΔT ： Temperature difference, ： Dynamic viscosity, : Inlet speed of heat dissipation fins l : Length of heat dissipation fins Thermal diffusivity G: Heat transfer coefficient of the first row of heat dissipation fins; G: Gap length. m : Number of fin rows, n : number of fin columns, H : Fin high, This allows us to calculate the total heat dissipation of the cooling fins under natural convection conditions.

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