Hydraulic Machine Integrated Heat Exchanger Cooling
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Solution Overview
Problem
Conventional hydraulic machines experience inefficient cooling due to large quantities of pressure medium being circulated for heat dissipation, leading to high investment and operating costs, and risks of water ingress into the hydraulic oil from external heat exchangers.
Innovation Solution
A hydraulic machine with a heat exchanger device integrated within the housing interior, utilizing a high ΔT and turbulent swirling of the pressure medium to enhance heat transfer efficiency, allowing for a smaller and more cost-effective cooling surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heat exchanger is used for cooling the hydraulic machine, then heat dissipation is achieved, but the risk of water ingress into hydraulic oil increases and the heat exchanger requires large surface area
Solution Approach 1:
The patent merges the heat exchanger device with the hydraulic machine housing by integrating it into the housing interior. The heat exchanger utilizes the leakage volume flow already present in the hydraulic machine, combining the cooling function with the existing hydraulic circuit without requiring separate external heat exchangers and their associated seals.
Solution Approach 2:
The heat exchanger device uses the leakage volume flow from the hydraulic machine's own operation as its cooling medium. This self-service approach eliminates the need for external coolant circulation systems and their vulnerable seals, while the turbulent swirling of the leakage flow provides effective heat transfer.
2Temperature
If large quantity of pressure medium is circulated for heat dissipation, then cooling is achieved, but investment and operating costs increase due to large heat exchanger surface area required
Solution Approach 1:
The patent changes the thermal parameters by utilizing the high ΔT (temperature difference) between the hot leakage volume flow and the cooling medium in the heat exchanger. This parameter optimization allows efficient heat dissipation with a compact heat exchanger surface area, reducing both investment and operating costs.
Solution Approach 2:
The patent employs turbulent swirling of the leakage volume flow through the heat exchanger device. This turbulent flow regime, analogous to mechanical vibration effects, significantly enhances heat transfer coefficients, allowing efficient cooling with reduced heat exchanger surface area.
3Temperature
If heat tube is arranged on outer side of hydraulic pump for cooling, then heat dissipation is achieved, but the heat tube is exposed to damage due to impact
Solution Approach 1:
The heat exchanger device is nested within the housing interior of the hydraulic machine, placing the cooling function inside the protected housing rather than on the external surface. This nesting protects the heat exchanger from external impacts while maintaining its cooling function through contact with the leakage volume flow.
4Temperature
If cooling jacket structure is used for hydraulic pump, then cooling is achieved, but structural space is occupied
Solution Approach 1:
The heat exchanger device is merged with the existing housing interior space of the hydraulic machine, eliminating the need for separate cooling jacket structures. This integration achieves effective cooling without occupying additional structural space, as it utilizes the already-present leakage volume flow within the housing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The integrated heat exchanger device achieves efficient heat transfer with a smaller surface area, reducing costs and minimizing temperature-induced wear, while eliminating the risk of water ingress and external heat exchanger vulnerabilities.
Implementation Method 1
a heat exchanger device is accommodated in the housing interior for cooling purposes. In particular, said heat exchanger device comes into contact with the leakage volume or leakage volume flow
Implementation Method 2
A turbulent swirling of a pressure medium quantity present in the housing interior because of the leakage is also high because of the rotating working chambers
Data Source
AI summary
A hydraulic machine includes a housing interior space and a group of hydrostatic working chambers which are mounted in said housing interior space so as to be rotatable about an axis of rotation and which, as the group rotates, are connectable alternately to a high pressure and to a low pressure of the hydraulic machine and exhibit leakage into the housing interior space. A heat exchanger device is accommodated in the housing interior space. The hydraulic machine may be associated with a hydraulic assembly and a hydraulic axle.