Valve plate structure of automobile thermal management system with hot gas bypass function
By setting up low-temperature and medium-temperature refrigerant runners in the valve plate structure of the automotive thermal management system and mixing refrigerants using the siphon principle, the problem of insufficient heating in the heat pump system in low-temperature environment is solved, and the compressor suction density and System heating.
Patent Information
- Application Number
- CN202420713592.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-09
AI Technical Summary
In the heat pump system of new energy electric vehicles, the speed of the compressor cannot be increased under low temperature environment, resulting in small flow of refrigerant, which is easy to overheat, and cannot meet the low-temperature heating requirements. The refrigerant temperature needs to be increased to prevent liquid impact and increase the production. Calories.
A valve plate structure of an automobile thermal management system with hot gas bypass function was designed. By setting a low-temperature, low-pressure and medium-temperature and medium-pressure refrigerant flow path on the main body of the valve plate, and using the principle of siphon communication holes, the low-temperature and low-pressure refrigerant is extracted. Enter the medium-temperature and medium-pressure flow channel, mix it with the high-temperature and high-pressure refrigerant to increase the superheat of the refrigerant at the outlet of the gas-liquid separator, and increase the refrigerant temperature at the compressor suction port.
It effectively prevents compressor liquid strikes, increases the heat capacity of the system, and solves the problem of heating of the heat pump system in low temperature environments.
Smart Images
Figure CN222157138U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile thermal management systems, in particular to a valve plate structure of an automobile thermal management system with a hot gas bypass function. Background Art
[0002] In the integrated thermal management system of new energy electric vehicles, the heat pump system is an integral part. For the heat pump system, the core significance of its existence is to solve the problem of heating in low temperature environments. When the ambient temperature is very low, in order to prevent liquid hammer, the compressor speed cannot be increased to a very high level. At the same time, due to the very low evaporation temperature, the corresponding compressor suction density will be very small, the refrigerant flow rate is small, and the compressor exhaust temperature is easy to overheat, resulting in temperature protection of the compressor. Therefore, the compressor speed can only be limited. As a result, the refrigerant flow rate is further constrained, and the system heating capacity cannot meet the low temperature requirements. Therefore, it is necessary to increase the refrigerant temperature at the compressor suction port to prevent compressor liquid hammer and increase the system heating capacity. The best way is to set up a hot gas bypass circuit, so how to use the limited space of the valve plate to set up a hot gas bypass circuit is an urgent problem to be solved. Utility Model Content
[0003] The utility model provides a valve plate structure of an automobile thermal management system with a hot gas bypass function, which can solve the problem of heating of the existing heat pump system in a low-temperature environment.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a valve plate structure of an automobile thermal management system with a hot gas bypass function, comprising a valve plate body, a first side of the valve plate body is provided with a plurality of flow channels, a second side of the valve plate body is provided with a plurality of component connection ports connected to the flow channels, a gas-liquid separator connection area is provided on the second side of the valve plate body, a first inlet and a second inlet connected to the gas-liquid separator are arranged side by side on the upper part of the gas-liquid separator connection area, a low-temperature and low-pressure refrigerant flow channel connected to the first inlet and a medium-temperature and medium-pressure refrigerant flow channel connected to the second inlet are provided on the first side of the valve plate body, a low-temperature and low-pressure refrigerant flow channel is provided in the gas-liquid separator connection area, the lower end of the low-temperature and low-pressure refrigerant flow channel is connected to the liquid refrigerant storage area in the gas-liquid separator, and the upper end of the low-temperature and low-pressure refrigerant flow channel extends to a position corresponding to the medium-temperature and medium-pressure refrigerant flow channel and is connected to the medium-temperature and medium-pressure refrigerant flow channel through a siphon communication hole penetrating the valve plate body.
[0005] Preferably, the medium-temperature and medium-pressure refrigerant flow channel is arc-shaped, the second inlet is located at the upper end of the medium-temperature and medium-pressure refrigerant flow channel, and the siphon connecting hole is located at the lowest position of the medium-temperature and medium-pressure refrigerant flow channel.
[0006] Preferably, the bottom surface of the medium-temperature and medium-pressure refrigerant flow channel is divided into a high bottom surface and a low bottom surface by a step, and the step is located on one side of the siphon connecting hole, and the siphon connecting hole is arranged on the low bottom surface.
[0007] Preferably, the low-temperature and low-pressure refrigerant flow channel is U-shaped, and the lowest end of the low-temperature and low-pressure refrigerant flow channel is connected to the liquid refrigerant storage area in the gas-liquid separator.
[0008] Preferably, the flow channel is closed on the first side of the valve plate body by brazing a welding plate.
[0009] Compared with the prior art, the beneficial effects of the utility model are:
[0010] The valve plate is specially designed to increase the low-temperature and low-pressure refrigerant flow channel and the medium-temperature and medium-pressure refrigerant flow channel. The height of the medium-temperature and medium-pressure refrigerant flow channel is higher than that of the low-temperature and low-pressure refrigerant flow channel, and the two are connected by a siphon connecting hole. When the medium-temperature and medium-pressure liquid refrigerant flows through the siphon connecting hole, the siphon principle is used to generate negative pressure, and the low-temperature and low-pressure liquid refrigerant in the low-temperature and low-pressure refrigerant flow channel is sucked into the medium-temperature and medium-pressure refrigerant flow channel, thereby increasing the temperature of the liquid refrigerant at the second inlet, so that after mixing with the high-temperature and high-pressure liquid refrigerant at the first inlet, the superheat of the refrigerant at the outlet of the gas-liquid separator can be increased, the refrigerant temperature at the suction port of the compressor can be increased, the compressor liquid hammer can be prevented, and the system heating capacity can be increased. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a first side front view of the valve plate of the utility model;
[0012] Figure 2 This is a first side stereoscopic structural diagram of the valve plate of the utility model;
[0013] Figure 3 This is a second side front view of the valve plate of the utility model;
[0014] Figure 4 for Figure 3 AA section structure diagram;
[0015] Figure 5 for Figure 4 The enlarged structure diagram at B;
[0016] Figure 6 It is a second side stereoscopic structural diagram of the utility model;
[0017] Figure 7 It is a first side front view of the valve plate of the utility model after welding the welding plate;
[0018] Figure 8 This is a schematic diagram of the installation of the valve plate and the gas-liquid separator of the utility model.
[0019] Reference numerals:
[0020] 1. Valve plate body, 11. Component connection port, 12. Gas-liquid separator, 2. Gas-liquid separator connection area, 3. Low-temperature and low-pressure refrigerant flow channel, 4. Second inlet, 5. First inlet, 6. Medium-temperature and medium-pressure refrigerant flow channel, 7. Siphon connecting hole, 8. Low-temperature and low-pressure refrigerant flow channel, 9. Back plate, 10. Step. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0022] The utility model aims to solve the problem of existing heat pump systems heating in low temperature environments. Figure 1-8 As shown, the following technical solution is provided: a valve plate structure of an automobile thermal management system with a hot gas bypass function, comprising a valve plate body 1, a first side of the valve plate body 1 is provided with a plurality of flow channels, a second side of the valve plate body 1 is provided with a plurality of component connection ports 11 connected to the flow channels, various components such as an electronic expansion valve, a one-way valve, a temperature and pressure sensor, etc. can be installed on the component connection port 11, and the exhaust port and the air intake port of the compressor are also connected, and the outlet and the inlet of the liquid-cooled condenser are connected. The specific flow channel position and the connection position of the components can be adjusted and designed according to different vehicle models and different needs.
[0023] In this embodiment, if Figure 8 As shown, the valve plate body 1 also needs to be installed with a gas-liquid separator 12. The gas-liquid separator 12 is one of the important components of the automobile air-conditioning system and is generally installed between the evaporator outlet and the compressor suction port. Its main functions are: (1) storing liquid refrigerant in the air-conditioning system and adjusting the system refrigerant circulation volume under different working conditions; (2) separating the gas-liquid mixed refrigerant into gas and liquid to prevent the liquid refrigerant from flowing into the compressor and causing "liquid hammer" in the compressor, thereby ensuring the reliability of the compressor operation.
[0024] Therefore, it is necessary to provide a gas-liquid separator connection area 2 on the second side of the valve plate body 1, wherein a first inlet 5 and a second inlet 4 connected to the gas-liquid separator 12 are arranged side by side on the upper part of the gas-liquid separator connection area 2, and a low-temperature and low-pressure flow refrigerant channel 8 connected to the first inlet 5 and a medium-temperature and medium-pressure refrigerant channel 6 connected to the second inlet 4 are provided on the first side of the valve plate body 1, and a low-temperature and low-pressure refrigerant flow channel 3 is provided in the gas-liquid separator connection area 2, and the lower end of the low-temperature and low-pressure refrigerant flow channel 3 is connected to the liquid refrigerant storage area in the gas-liquid separator 12, and the upper end of the low-temperature and low-pressure refrigerant flow channel 3 extends to a position corresponding to the medium-temperature and medium-pressure refrigerant flow channel 6 and is connected to the medium-temperature and medium-pressure refrigerant flow channel 6 through a siphon connecting hole 7 penetrating the valve plate body 1.
[0025] Specifically, the valve plate body 1 can be integrally formed by a die-casting process, wherein the low-temperature and low-pressure refrigerant flow channel 8 connected to the first inlet 5 is connected to the evaporator outlet, and the low-temperature and low-pressure refrigerant flow channel 3 contains the low-temperature and low-pressure liquid refrigerant remaining after gas-liquid separation in the gas-liquid separator 12, which enters the low-temperature and low-pressure refrigerant flow channel 3 after being filtered by the filter.
[0026] In this embodiment, the siphon principle is required to pump the low-temperature and low-pressure refrigerant in the low-temperature and low-pressure refrigerant flow channel 3 upward. The siphon phenomenon is a physical process in which the liquid in the siphon tube undergoes a change from static to dynamic. The instantaneous pressure change causes a pressure difference on the liquid / gas surface at both ends, and the combined effect causes the liquid to flow. The fundamental reason for the pressure difference is the height difference of the liquid at both ends. The overall flow is formed by the cohesive force between the liquid molecules. The siphon phenomenon refers to the phenomenon that when negative pressure appears in the liquid in the flow channel, the liquid in the flow channel will flow upward. The principle of the siphon phenomenon is based on the equilibrium relationship between the pressure and gravity of the liquid. When the liquid flows from a high place to a low place, it will be affected by gravity and form liquid pressure.
[0027] In the refrigerant side valve plate flow channel, the pressure of the liquid refrigerant is formed by the combined effect of the gas refrigerant pressure in the flow channel and the gravity of the liquid refrigerant. When the liquid refrigerant in the flow channel flows, the gravity of the liquid refrigerant will increase, causing the pressure of the liquid refrigerant to increase. When the pressure of the liquid refrigerant in the flow channel is greater than the air pressure outside the pipeline, negative pressure will be formed, which is the siphon phenomenon.
[0028] Therefore, when the ambient temperature is very low, the high-temperature and high-pressure refrigerant from the compressor outlet passes through the electronic expansion valve to become medium-temperature and medium-pressure refrigerant, and flows in the medium-temperature and medium-pressure refrigerant flow channel 6. When the liquid refrigerant in the medium-temperature and medium-pressure refrigerant flow channel 6 flows through, negative pressure can be generated through the siphon connecting hole 7, and the low-temperature and low-pressure liquid refrigerant stored in the gas-liquid separator cavity is drawn upward along the low-temperature and low-pressure refrigerant flow channel 3 into the medium-temperature and medium-pressure refrigerant flow channel 6, and after mixing with the medium-temperature and medium-pressure gaseous refrigerant, it flows to the second inlet 4 of the gas-liquid separator; the high-temperature and high-pressure refrigerant at the compressor outlet passes through the other route. After the external heat exchanger, electronic expansion valve and evaporator, it becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then enters the first inlet 5 of the gas-liquid separator. The refrigerants at the first inlet 5 and the second inlet 4 are mixed in the gas-liquid separator chamber, which increases the temperature of the refrigerant, the medium-temperature and medium-pressure refrigerant flow channel, the siphon connecting hole of the low-temperature and low-pressure refrigerant flow channel, the medium-temperature and medium-pressure refrigerant flow channel, and the medium-temperature and medium-pressure refrigerant flow channel. As a result, the density of the refrigerant will increase, so that the suction density of the compressor is improved, the suction port flow rate of the compressor is increased, and the heating capacity of the system is improved, which can solve the problem of heating of the existing heat pump system in a low-temperature environment.
[0029] As the refrigerant circuit of the thermal management system, there is a bypass branch from the compressor exhaust port, which can directly return to the gas-liquid separator and then to the compressor suction port after passing through a solenoid valve. That is, as long as the solenoid valve is opened, the compressor exhaust port and the suction port will be connected. This is different from the common reverse Carnot cycle. The exhaust does not pass through the condenser and evaporator, but directly returns to the compressor suction port.
[0030] In this embodiment, the flow passage is closed on the first side of the valve plate body 1 by brazing a back plate 9, and the process is simple and convenient.
[0031] In this embodiment, if Figure 1-2 As shown, the medium-temperature and medium-pressure refrigerant flow channel 6 is arc-shaped, the second inlet 4 is located at the upper end of the medium-temperature and medium-pressure refrigerant flow channel 6, and the siphon connecting hole 7 is located at the lowest position of the medium-temperature and medium-pressure refrigerant flow channel 6, which is beneficial for the liquid refrigerant in the medium-temperature and medium-pressure refrigerant flow channel 6 to generate a sufficiently large pressure when passing through the siphon connecting hole 7.
[0032] In this embodiment, if Figure 4-5 As shown, the bottom surface of the medium-temperature and medium-pressure refrigerant flow channel 6 is divided into a high bottom surface and a low bottom surface by a step 10, and the step 10 is located on one side of the siphon connecting hole 7. The siphon connecting hole 7 is arranged on the low bottom surface, which can increase the pressure of the liquid refrigerant flowing through the siphon connecting hole 7.
[0033] In this embodiment, the low-temperature and low-pressure refrigerant flow channel 3 is U-shaped, and the lowest end of the low-temperature and low-pressure refrigerant flow channel 3 is connected to the liquid refrigerant storage area in the gas-liquid separator 12, so that the liquid refrigerant in the low-temperature and low-pressure refrigerant flow channel 3 can rush downward after bypassing the top of the U shape and enter the siphon connecting hole 7.
[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0035] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0036] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0037] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
Claims
1. A valve plate structure of an automobile thermal management system with a hot gas bypass function, comprising a valve plate body (1), a first side of the valve plate body (1) being provided with a plurality of flow channels, a second side of the valve plate body (1) being provided with a plurality of component connection ports (11) connected to the flow channels, characterized in that: A gas-liquid separator connection area (2) is provided on the second side of the valve plate body (1), and a first inlet (5) and a second inlet (4) connected to the gas-liquid separator (12) are arranged side by side on the upper part of the gas-liquid separator connection area (2). A low-temperature, low-pressure refrigerant flow channel (8) connected to the first inlet (5) and a medium-temperature, medium-pressure refrigerant flow channel (6) connected to the second inlet (4) are provided on the first side of the valve plate body (1). A low-temperature, low-pressure refrigerant flow channel (3) is provided in the gas-liquid separator connection area (2), and the lower end of the low-temperature, low-pressure refrigerant flow channel (3) is connected to the liquid refrigerant storage area in the gas-liquid separator (12), and the upper end of the low-temperature, low-pressure refrigerant flow channel (3) extends to a position corresponding to the medium-temperature, medium-pressure refrigerant flow channel (6) and is connected to the medium-temperature, medium-pressure refrigerant flow channel (6) through a siphon connecting hole (7) penetrating the valve plate body (1).
2. The valve plate structure of the automotive thermal management system with hot gas bypass function according to claim 1, characterized in that: The medium-temperature and medium-pressure refrigerant flow channel (6) is arc-shaped, the second inlet (4) is located at the upper end of the medium-temperature and medium-pressure refrigerant flow channel (6), and the siphon connecting hole (7) is located at the lowest position of the medium-temperature and medium-pressure refrigerant flow channel (6).
3. The valve plate structure of the automotive thermal management system with hot gas bypass function according to claim 1, characterized in that: The bottom surface of the medium-temperature and medium-pressure refrigerant flow channel (6) is divided into a high bottom surface and a low bottom surface by a step (10), and the step (10) is located on one side of the siphon connecting hole (7), and the siphon connecting hole (7) is arranged on the low bottom surface.
4. The valve plate structure of the automotive thermal management system with hot gas bypass function according to claim 1, characterized in that: The low-temperature and low-pressure refrigerant flow channel (3) is U-shaped, and the lowest end of the low-temperature and low-pressure refrigerant flow channel (3) is connected to the liquid refrigerant storage area in the gas-liquid separator (12).
5. The valve plate structure of the automotive thermal management system with hot gas bypass function according to claim 1, characterized in that: A welding plate (9) is assembled on the first side of the valve plate body (1) through a brazing process to seal the flow channel.