Electric compressor, thermal management system and vehicle

Abstract

This invention discloses an electric compressor, a thermal management system, and a vehicle. The electric compressor includes a housing, a pressure relief valve, and an elastic seal. A mounting hole is formed on the housing, and a pressure relief hole is formed on the bottom wall of the mounting hole. The pressure relief valve is mounted in the mounting hole and communicates with the pressure relief hole. The pressure relief valve has a sealing head disposed facing the bottom wall of the mounting hole. The elastic seal seals between the bottom wall of the mounting hole and the sealing head, and includes a first sealing portion, a second sealing portion, and an elastic connecting portion. The first sealing portion, the second sealing portion, and the elastic connecting portion are all disposed around the outer periphery of the pressure relief hole. The first sealing portion abuts against the bottom wall of the mounting hole, the second sealing portion abuts against the sealing head, and the elastic connecting portion is bent and connected between the first sealing portion and the second sealing portion, and is adapted to apply an elastic force that moves away from each other along the axial direction of the mounting hole to the first sealing portion and the second sealing portion. This reduces the possibility of the elastic seal undergoing yielding deformation.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to an electric compressor, a thermal management system, and a vehicle. Background Technology

[0002] Compressors are generally equipped with pressure relief valves to prevent damage to the casing caused by abnormally high internal pressure, especially compressors using high-pressure refrigerants. These compressors often experience a significant rise in discharge temperature along with high discharge pressure, thus placing certain requirements on the sealing method of the pressure relief valve.

[0003] In related technologies, a seal is typically installed between the compressor housing and the pressure relief valve to reduce the possibility of refrigerant leakage through the tiny gap between the valve and the housing. However, for compressors with higher discharge pressures, the sealing surface pressure requirements at the seal are higher, and the seal is prone to yielding under high sealing surface pressure, increasing the risk of refrigerant leakage from the seal. Therefore, the sealing technology between the pressure relief valve and the compressor housing still needs improvement. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an electric compressor, a thermal management system, and a vehicle, wherein the elastic seal in the electric compressor has a certain deformation space, thereby reducing the possibility of the elastic seal yielding and deforming, making the electric compressor operate more stably.

[0005] According to a first aspect of the present invention, an electric compressor includes a housing, a pressure relief valve, and an elastic seal. A mounting hole is formed on the housing, and a pressure relief hole is formed on the bottom wall of the mounting hole. The pressure relief valve is mounted in the mounting hole and communicates with the pressure relief hole. The pressure relief valve has a sealing head disposed facing the bottom wall of the mounting hole. The elastic seal is sealed between the bottom wall of the mounting hole and the sealing head and is disposed independently of the housing and the pressure relief valve. The elastic seal and the housing are engaged radially and / or circumferentially in the pressure relief hole. The elastic seal includes a first sealing portion, a second sealing portion, and an elastic connecting portion. The first sealing portion, the second sealing portion, and the elastic connecting portion are all disposed around the outer periphery of the pressure relief hole. The first sealing portion abuts against the bottom wall of the mounting hole, the second sealing portion abuts against the sealing head, and the elastic connecting portion is bent and connected between the first sealing portion and the second sealing portion, and is adapted to apply an elastic force that moves away from each other along the axial direction of the mounting hole to the first sealing portion and the second sealing portion.

[0006] According to an embodiment of the electric compressor of the present invention, an elastic seal is provided between the housing and the pressure relief valve. The elastic seal is configured to include a first sealing portion, a second sealing portion, and an elastic connecting portion. The elastic connecting portion is adapted to apply an elastic force to the first sealing portion and the second sealing portion, which are axially separated from each other along the mounting hole. This allows the elastic seal to seal between the housing and the pressure relief valve while also utilizing its own elastic deformation capability to absorb thermal expansion deformation of the housing and the pressure relief valve at higher temperatures. This reduces the increase in sealing surface pressure of the elastic seal due to thermal expansion deformation and lowers the possibility of yielding deformation of the elastic seal, housing, and pressure relief valve. After the electric compressor stops working or the ambient temperature drops, the housing, pressure relief valve, etc., shrink due to material contraction. The elastic seal 30 then utilizes its elastic deformation capability to tend to restore its original shape, which helps to restore the sealing surface pressure at the elastic seal to the initial sealing surface pressure, thereby improving the sealing reliability between the pressure relief valve and the housing.

[0007] In some embodiments, the first sealing portion and the second sealing portion are disposed radially inside and outside the mounting hole, and the elastic connection portion is formed in a tapered shape.

[0008] In some embodiments, the thickness of the resilient seal is t, where 0.2 mm ≤ t ≤ 2 mm.

[0009] In some embodiments, the resilient seal further includes a first guide portion connected to the inner periphery of the first sealing portion, and on the longitudinal section of the resilient seal, the first guide portion extends in the direction of the pressure relief valve toward the pressure relief hole toward the direction of the pressure relief hole toward the direction of the pressure relief hole, and is radially upper limit matched with the end of the pressure relief hole; and / or, the fitting clearance between the outer peripheral wall of the resilient seal and the hole wall of the mounting hole is x, 0.2mm≤x≤1mm.

[0010] In some embodiments, the second sealing portion is sleeved outside the first sealing portion, and the elastic seal includes a first guiding portion, the first guiding portion and the elastic connecting portion being formed in a conical shape.

[0011] In some embodiments, the resilient seal includes a first guide portion, and a second guide portion is provided at one end of the pressure relief orifice facing the pressure relief valve. The second guide portion is formed as a conical surface and extends in a direction close to the central axis of the pressure relief orifice along the direction of the pressure relief valve toward the pressure relief orifice. The first guide portion is inserted into the second guide portion.

[0012] In some embodiments, the resilient seal includes a metal material layer and an elastic material layer, the elastic material layer being wrapped around the metal material layer, the yield strength σ of the metal material layer being ≥500MPa, and the elastic material layer being nitrile rubber, fluororubber, polytetrafluoroethylene, polyetheretherketone, polyimide, tin, copper, or graphite; and / or, the contact surface pressure P of the resilient seal satisfies 30MPa≤P≤150MPa.

[0013] In some embodiments, the housing includes a low-pressure housing, a bracket, and a high-pressure housing. The bracket is sandwiched between the low-pressure housing and the high-pressure housing, and the bracket and the low-pressure housing define a low-pressure intake chamber. The bracket and the high-pressure housing define a high-pressure exhaust chamber. A mounting hole and a pressure relief hole are formed on the high-pressure housing. The pressure relief hole communicates with the high-pressure exhaust chamber. The pump body structure of the electric compressor is located in the high-pressure exhaust chamber, and the inlet of the pump body structure communicates with the low-pressure intake chamber, and the outlet of the pump body structure communicates with the high-pressure exhaust chamber.

[0014] In some embodiments, the electric compressor is a horizontal compressor used in a vehicle, and the refrigerant used in the electric compressor is carbon dioxide.

[0015] In some embodiments, the electric compressor further includes a gasket fixed to the sealing head and sealed between the resilient seal and the sealing head. The inner peripheral wall of the gasket has a locking protrusion, and the free end of the sealing head has a riveted flange that abuts against the side of the locking protrusion facing the pressure relief hole.

[0016] In some embodiments, the surface roughness of the sealing end face in contact with the elastic seal does not exceed Rz6.3; and / or, the elastic seal is circumferentially limited to the wall of the mounting hole by a limiting structure, the limiting structure including a limiting protrusion and a limiting groove, the limiting protrusion fitting into the limiting groove.

[0017] A thermal management system according to a second aspect of the present invention includes an electric compressor according to a first aspect of the present invention.

[0018] According to embodiments of the present invention, the use of the electric compressor described above in the thermal management system improves the reliability of the thermal management system.

[0019] A vehicle according to a third aspect of the present invention includes an electric compressor according to a first aspect of the present invention or a thermal management system according to a second aspect of the present invention.

[0020] The vehicle according to embodiments of the present invention, by employing the above-described electric compressor or thermal management system, benefits from improved vehicle reliability.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 A schematic diagram of an electric compressor according to some embodiments of the present invention;

[0024] Figure 2 for Figure 1 An enlarged view of part A, shown in the center circle;

[0025] Figure 3 for Figure 2 An enlarged view of section B, shown in the center circle;

[0026] Figure 4 for Figure 2 Assembly diagram of removing the gasket from the electric compressor;

[0027] Figure 5 for Figure 4 Enlarged view of section C, shown in the center circle;

[0028] Figure 6 for Figure 1 A schematic diagram of the resilient seal shown;

[0029] Figure 7 for Figure 6 Another schematic diagram of the resilient seal shown;

[0030] Figure 8 for Figure 1 A cross-sectional view of the electric compressor shown;

[0031] Figure 9 This is a schematic diagram of a vehicle according to some embodiments of the present invention.

[0032] Figure label:

[0033] Electric compressor 1, thermal management system 2, vehicle 3, housing 10, mounting hole 12, bottom wall 120, pressure relief hole 14, second guide part 140, low-pressure housing 16, low-pressure intake chamber 160, bracket 17, high-pressure housing 18, high-pressure exhaust chamber 180, pump body structure 19, pressure relief valve 20, sealing head 22, elastic seal 30, first sealing part 31, second sealing part 32, elastic connection part 33, first guide part 35, sealing gasket 40, locking protrusion 42. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0036] Hereinafter, with reference to the accompanying drawings, an electric compressor 1 according to a first aspect embodiment of the present invention will be described.

[0037] like Figures 1-7 As shown, the electric compressor 1 includes a housing 10, a pressure relief valve 20, and an elastic seal 30. A mounting hole 12 is formed on the housing 10, and a pressure relief hole 14 is formed on the bottom wall 120 of the mounting hole 12. The pressure relief valve 20 is installed in the mounting hole 12 and communicates with the pressure relief hole 14. The pressure relief valve 20 has a sealing head 22 disposed facing the bottom wall 120 of the mounting hole 12. The elastic seal 30 is sealed between the bottom wall 120 of the mounting hole 12 and the sealing head 22. The elastic seal 30 is disposed independently of the housing 10 and the pressure relief valve 20. Therefore, there is no connection between the elastic seal 30 and the housing 10, and there is also no connection between the elastic seal 30 and the pressure relief valve 20, making the elastic seal 30 a separate component, which is easy to replace and maintain. The resilient seal 30 and the housing 10 are fitted together radially and / or circumferentially in the pressure relief hole 20. This radial and / or circumferential fitting facilitates quick positioning of the resilient seal 30 during installation, improving installation efficiency and facilitating subsequent installation of the pressure relief valve 20. It also reduces the likelihood of displacement due to pressure or vibration, ensuring a stable seal. Furthermore, the fitting reduces relative displacement between the resilient seal 30, the housing 10, and the pressure relief valve 20, thereby reducing wear, extending service life, and improving sealing reliability.

[0038] As can be seen, compared to some technologies where the pressure relief valve and the housing are sealed using the valve's own seal or a seal integrated with the valve, the pressure relief valve needs to be replaced when the seal fails, resulting in high maintenance costs. In the above solution of this application, the elastic seal 30 is set independently of the pressure relief valve 20 and the housing 10, which facilitates the separate replacement and maintenance of the elastic seal 30 and helps to reduce maintenance costs.

[0039] It is understood that in this embodiment, the elastic seal 30 is assembled with the housing 10 before the pressure relief valve 20. Therefore, when the pressure relief valve 20 is installed, the elastic seal 30 is already in a limiting fit with the housing 10, which helps to reduce the movement of the elastic seal 30 relative to the housing 10 under the action of the pressure relief valve 20 during the installation process. This can improve the problem of the elastic seal 30 being easily displaced due to the action of the pressure relief valve 20, which leads to a decrease in sealing performance.

[0040] The elastic seal 30 includes a first sealing part 31, a second sealing part 32, and an elastic connecting part 33. The first sealing part 31, the second sealing part 32, and the elastic connecting part 33 are all arranged around the outer periphery of the pressure relief hole 14. Therefore, the first sealing part 31, the second sealing part 32, and the elastic connecting part 33 are unlikely to block the pressure relief hole 14. The elastic seal 30 will not affect the connection between the pressure relief hole 14 and the pressure relief valve 20. In other words, the arrangement of the elastic seal 30 is unlikely to affect the smoothness of pressure relief when the internal pressure of the electric compressor 1 is too high.

[0041] The first sealing part 31 abuts against the bottom wall 120 of the mounting hole 12, the second sealing part 32 abuts against the sealing head 22, and the elastic connecting part 33 is bent and connected between the first sealing part 31 and the second sealing part 32, and the elastic connecting part 33 is adapted to apply pressure to the first sealing part 31 and the second sealing part 32 along the axial direction of the mounting hole 12 (e.g., Figure 2 The elastic forces that are far apart from each other (the extension direction of the central axis L1 in the middle). It can be understood that the mounting hole 12 has a central axis L1, the extension direction of the central axis L1 is the axial direction of the mounting hole 12 and the axial direction of the elastic seal 30, the direction around the central axis L1 is the circumferential direction of the mounting hole 12 and the circumferential direction of the elastic seal 30, and in the radial plane, the direction passing through the central axis L1 is the radial direction of the mounting hole 12 and the radial direction of the elastic seal 30, and the radial plane is perpendicular to the central axis L1.

[0042] As can be seen, the elastic seal 30 seals between the bottom wall 120 of the mounting hole 12 and the sealing head 22 of the pressure relief valve 20. The elastic connection 33 is bent and connected between the first sealing part 31 and the second sealing part 32. The elastic connection 33 applies an elastic force to the first sealing part 31 and the second sealing part 32, causing them to move away from each other along the axial direction of the mounting hole 12. This makes the first sealing part 31 fit more tightly against the bottom wall 120 of the mounting hole 12, and the second sealing part 32 fit more tightly against the sealing head 22, reducing the possibility of refrigerant leakage from the gap formed between the bottom wall 120 of the mounting hole 12 and the sealing head 22.

[0043] Furthermore, since the elastic connecting part 33 applies an elastic force to the first sealing part 31 and the second sealing part 32, causing them to move away from each other along the axial direction of the mounting hole 12, a certain gap can exist between the first sealing part 31 and the sealing head 22, a certain gap can exist between the second sealing part 32 and the bottom wall 120 of the mounting hole 12, and a certain gap can also exist between the elastic connecting part 33 and the bottom wall 120 of the mounting hole 12 and the sealing head 22. When the operating temperature of the electric compressor 1 is very high, for example, when the operating temperature of the electric compressor 1 is higher than 150°C, the outer casing 10, the pressure relief valve 20, etc., undergo thermal expansion and deformation, squeezing the elastic seal 30. The first sealing part 31 and the second sealing part 32 overcome the elastic force applied by the elastic connecting part 33 and move closer to each other along the axial direction of the mounting hole 12. The elastic seal 30 can absorb the above-mentioned thermal expansion and deformation through elastic deformation, thereby reducing the increase in sealing surface pressure of the elastic seal 30 due to thermal expansion and deformation, improving the problem of excessive increase in sealing surface pressure at the position of the elastic seal 30 due to thermal expansion and deformation, and facilitating the elastic seal 30 to... The sealing surface pressure is maintained at a reasonable level, reducing the possibility of yielding deformation of the elastic seal 30. After the electric compressor 1 stops working or the ambient temperature drops, the housing 10, pressure relief valve 20, etc. shrink due to material contraction. The first sealing part 31 and the second sealing part 32 move away from each other axially in the mounting hole 12 under the action of the elastic connection part 33. The elastic seal 30 tends to return to its original shape, which helps to restore the sealing surface pressure at the elastic seal 30 to the initial sealing surface pressure. This ensures that the elastic seal 30 still has a suitable contact surface pressure to maintain a tight seal, thus achieving a reliable seal between the pressure relief valve 20 and the housing 10.

[0044] It is evident that the resilient seal 30 can adapt to applications with high and fluctuating temperatures. It is less prone to yielding due to high temperatures, thus reducing its sealing performance. Conversely, it is less likely to experience a decrease in sealing performance due to insufficient pressure at the sealing surface caused by temperature drops. This improves the sealing performance between the housing 10 and the pressure relief valve 20. Furthermore, the resilient seal 30 maintains its appropriate shape during thermal expansion and contraction, reducing the likelihood of yielding and deformation due to excessive compression, thereby extending its service life.

[0045] Among them, the sealing surface pressure at the elastic seal 30 corresponds to the contact surface pressure, which refers to the positive pressure per unit area on the contact surface of adjacent components (such as the bottom wall 120 of the mounting hole 12 and the sealing head 22 of the pressure relief valve 20).

[0046] In this embodiment, the relative positions of the first sealing part 31 and the second sealing part 32 in the radial direction of the mounting hole 12 are not specifically limited; the elastic force applied by the elastic connecting part 33 to the first sealing part 31 and the second sealing part 32 along the axial direction of the mounting hole 12, which is far away from each other, can be the total elastic force applied by the elastic connecting part 33 to the first sealing part 31 and the second sealing part 32, or it can be a component of the total elastic force applied by the elastic connecting part 33 to the first sealing part 31 and the second sealing part 32. It is only necessary to ensure that the elastic sealing member 30 can always maintain a seal with the housing 10 and the pressure relief valve 20 under the compression of the housing 10 and the pressure relief valve 20, while also adapting to the change in the gap between the housing 10 and the pressure relief valve 20 due to temperature changes.

[0047] In some technologies, the seal is a flat plate structure, which is used to seal between the compressor housing and the pressure relief valve. The seal is usually made of polymer materials such as rubber or metal substrate with a coating. Rubber seals are generally used in applications below 150°C. For applications above 150°C, other polymer materials are generally used. These polymer materials are usually much harder than rubber, so a higher sealing surface pressure is required to achieve a seal. However, excessively high sealing surface pressure can easily cause these sealing materials to yield, especially under high temperature conditions. Yielding of the sealing material can easily cause a drop in sealing surface pressure, leading to leakage and seal failure.

[0048] According to an embodiment of the electric compressor 1 of the present invention, an elastic seal 30 is provided between the housing 10 and the pressure relief valve 20. The elastic seal 30 is configured to include a first sealing portion 31, a second sealing portion 32, and an elastic connecting portion 33. The elastic connecting portion 33 is adapted to apply an elastic force to the first sealing portion 31 and the second sealing portion 32, moving them away from each other along the axial direction of the mounting hole 12. This allows the elastic seal 30 to seal between the housing 10 and the pressure relief valve 20 while also utilizing the elastic deformation capability of the elastic seal 30 itself to prevent thermal expansion and deformation of the housing 10 and the pressure relief valve 20 at higher temperatures. At the same time, the elastic deformation absorbs the above-mentioned thermal expansion deformation, thereby reducing the increase in sealing surface pressure of the elastic seal 30 caused by thermal expansion deformation, and reducing the possibility of yielding deformation of the elastic seal 30, housing 10, and pressure relief valve 20; after the electric compressor 1 stops working or the ambient temperature drops, the housing 10, pressure relief valve 20, etc., shrink due to material contraction, and the elastic seal 30 once again uses its elastic deformation ability to tend to restore its original shape, which is conducive to the sealing surface pressure at the elastic seal 30 tending to restore to the initial sealing surface pressure, thereby improving the sealing reliability between the pressure relief valve 20 and housing 10.

[0049] Furthermore, in related technologies, when the compressor operates at high temperatures, such as above 150°C, the tightening torque of the pressure relief valve generally decreases. Investigations revealed that the sealing face of the pressure relief valve and the sealing face of the outer casing undergo yielding deformation, resulting in a decrease in the pressure relief valve torque and leakage at the sealing face. The main reason is that the compressor operates at high pressure, requiring a relatively high sealing surface pressure. This high sealing surface pressure exceeds the yield strength of the sealing material, especially at high temperatures where the yield strength of the sealing material decreases significantly. High-temperature thermal expansion further increases the contact surface pressure, easily leading to yielding deformation. After yielding deformation, when the compressor stops or the ambient temperature drops, the material contracts, and the contact surface pressure of the sealing face drops sharply, causing refrigerant inside the compressor to leak from the sealing face.

[0050] In the above-mentioned solution of this application, even if the bottom wall 120 of the mounting hole 12 and / or the sealing head 22 of the pressure relief valve 20 yield at the sealing end face due to factors such as high temperature during use, the elastic seal 30 can still use its own elastic deformation ability to compensate for the yielding amount to a certain extent, improve the problem of leakage caused by the sharp drop in sealing surface pressure at the position of the elastic seal 30, and improve the sealing reliability between the pressure relief valve 20 and the outer shell 10.

[0051] In this embodiment, the first sealing part 31 abuts against the bottom wall 120 of the mounting hole 12, which may include the first sealing part 31 directly contacting the bottom wall 120 or the first sealing part 31 indirectly abutting against the bottom wall 120 through other structures; similarly, the second sealing part 31 abuts against the sealing head 22, which may include the second sealing part 32 directly contacting the sealing head 22 or the second sealing part 32 indirectly abutting against the sealing head 22 through other structures (such as the sealing gasket 40 described later).

[0052] like Figures 1-7 As shown, in some embodiments, the first sealing part 31 and the second sealing part 32 are arranged inside and outside the mounting hole 12 radially, and the elastic connecting part 33 is formed into a cone shape. The first sealing part 31, the elastic connecting part 3, and the second sealing part 32 are arranged sequentially along the radial direction of the mounting hole 12. The first sealing part 31, the elastic connecting part 3, and the second sealing part 32 roughly define a cone-shaped structure, which simplifies the structure of the elastic sealing element 30 and facilitates processing. At the same time, the elastic sealing element 30 has good energy storage and elasticity, which makes it easy to ensure that the sealing surface pressure does not fluctuate greatly when the gap between the outer shell 10 and the pressure relief valve 10 changes within a certain size range of 0 to 1 mm.

[0053] Furthermore, the first sealing part 31, the elastic connecting part 3, and the second sealing part 32 generally define a conical structure, which allows the elastic sealing element 30 to distribute pressure more evenly when under force, reducing the risk of sealing failure caused by pressure concentration. In addition, the conical elastic connecting part 33 has good elastic recovery ability and can quickly return to its original shape after the compressor stops working or the ambient temperature drops, thereby maintaining a stable sealing effect.

[0054] It is understood that the first sealing part 31 may be sleeved on the outside of the second sealing part 32, or the second sealing part 32 may be sleeved on the outside of the first sealing part 31, making the arrangement of the first sealing part 31 and the second sealing part 32 more flexible and adaptable to different installation conditions. Of course, in other embodiments of this application, the first sealing part 31 and the second sealing part 32 may also be arranged opposite to each other along the axial direction of the mounting hole 12.

[0055] like Figure 3 and Figure 5 As shown, in some embodiments, the thickness of the elastic seal 30 is t, where 0.2mm ≤ t ≤ 2mm. When the elastic seal 30 is thin (e.g., t < 0.2mm), the elastic modulus of the thinner elastic seal 30 is relatively low under pressure, making it more prone to elastic deformation, which limits the sealing effect. Moreover, due to insufficient material thickness, the wear resistance of the elastic seal 30 may decrease, making it more susceptible to wear during long-term use, leading to a decline in sealing performance. When the elastic seal 30 is thick (e.g., t > 2mm), a larger pressure is required for the elastic seal 30 to deform, which can easily increase the sealing surface pressure between the housing 10 and the pressure relief valve 20, and easily increase the pressure on the housing 10 and the pressure relief valve 20. The risk of yielding at the sealing end face is eliminated, and a thicker elastic seal 30 requires more material to manufacture, which increases the manufacturing cost of the elastic seal 30. By setting the thickness of the elastic seal 30 in the range of 0.2mm to 2mm, the elastic seal 30 has a suitable elastic module and can deform moderately under pressure without excessive sealing surface pressure. The elastic seal 30 also has sufficient strength and wear resistance to cope with wear and corrosion during long-term use, while reducing the amount of material used to manufacture the elastic seal 30, thus reducing the manufacturing cost of the elastic seal 30.

[0056] It is understandable that the thickness of the elastic seal 30 is set in the range of 0.2mm to 2mm. Operators can determine the specific thickness of the elastic seal 30 according to the required sealing surface pressure, so that the elastic seal 30 has good sealing performance while the manufacturing cost can be further reduced.

[0057] It is understood that the first sealing part 31 and the second sealing part 32 are fitted inside and outside the mounting hole 12 radially, and the elastic connecting part 33 is formed into a cone shape. At this time, the thickness of the first sealing part 31, the second sealing part 32 and the elastic connecting part 33 are all within the range of 0.2mm to 2mm, and the thickness of the three can be equal or unequal.

[0058] like Figures 1-7 As shown, in some embodiments, the resilient seal 30 further includes a first guide portion 35, which is connected to the inner periphery of the first seal portion 31. In the longitudinal section of the resilient seal 30, the first guide portion 35 is oriented towards the central axis of the pressure relief valve 20 toward the pressure relief hole 14 (e.g., ...). Figure 3 The first guide portion 35 extends in the direction of L2) and the end of the pressure relief hole 14 is radially upper limit matched with the first guide portion 35.

[0059] As can be seen, the first guide part 35 is connected to the inner periphery of the first sealing part 31, the first sealing part 31 abuts against the bottom wall 120 of the mounting hole 12, and the first guide part 35 extends along the direction of the pressure relief valve 20 toward the pressure relief hole 14 toward the direction close to the central axis of the pressure relief hole 14. Thus, the first guide part 35 provides a guide path for the installation of the elastic seal 30, so that the elastic seal 30 can be more easily and quickly positioned in the correct position during installation, thereby achieving radial limiting of the first elastic seal 30 and the outer shell 10. For example, when installing the elastic seal 30, the operator can align the first guide portion 35 with the pressure relief hole 14 so that it fits into the end of the pressure relief hole 14, facilitating the quick placement of the elastic seal 30 in the installation position and simplifying the installation process. Simultaneously, the first guide portion 35 extends along the pressure relief valve 20 toward the pressure relief hole 14 and toward the central axis of the pressure relief hole 14. Therefore, during installation, the first guide portion 35 can at least partially engage with the pressure relief hole 14, facilitating radial positioning of the elastic seal 30 and reducing the possibility of radial displacement during installation and use. This improves the positional stability of the elastic seal 30, thereby enhancing sealing reliability. ; and / or, the fit clearance between the outer peripheral wall of the elastic seal 30 and the wall of the mounting hole 12 is x, 0.2mm≤x≤1mm. By setting the fit clearance between the outer peripheral wall of the elastic seal 30 and the wall of the mounting hole 12 in the range of 0.2mm to 1mm, this clearance facilitates the smooth insertion of the elastic seal 30 into the mounting hole 12, while also allowing the wall of the mounting hole 12 to provide a certain radial limit on the elastic seal 30. This ensures that the elastic seal 30 is blocked by the wall of the mounting hole 12 during installation or use, preventing excessive radial displacement of the elastic seal 30. This, to a certain extent, limits the radial displacement of the elastic seal 30 and reduces the wear of the elastic seal 30.

[0060] For example, the fit clearance between the outer peripheral wall of the elastic seal 30 and the hole wall of the mounting hole 12 can be 0.2mm, 0.4mm, 0.5mm, 0.7mm, 0.8mm, or 1mm, etc.

[0061] like Figures 1-7 As shown, in some embodiments, the second sealing part 22 is sleeved outside the first sealing part 31, and the elastic sealing member 30 includes a first guiding part 35, both the first guiding part 35 and the elastic connecting part 33 are formed in a conical shape.

[0062] As can be seen, the second sealing part 32 is sleeved outside the first sealing part 31, the elastic connecting part 33 is connected between the first sealing part 31 and the second sealing part 32, and the first guiding part 15 is connected to the outer periphery of the first sealing part 31. Thus, the elastic sealing member 30 is arranged radially from the outside to the inside as follows: the second sealing part 32, the elastic connecting part 33, the first sealing part 31, and the first guiding part 35. The first guiding part 35 and the elastic connecting part 33 are formed into a cone shape, so that the elastic sealing member 30 is generally formed into a cone shape, which is simple in structure and easy to process. For example, the first guiding part 15 is located at the innermost side of the elastic sealing member 30 in the radial direction and the position of the elastic sealing member 30 closest to the pressure relief hole 14 in the axial direction. The first guiding part 15 can serve as a clear installation reference point. During the installation of the elastic sealing member 30, the operator can more easily identify the correct installation position and direction, thereby simplifying the installation steps and reducing the installation time.

[0063] Furthermore, the first guide portion 35 is formed in a conical shape. The conical structure has natural guiding properties, which makes it easier for the elastic seal 30 to be guided and positioned along the central axis of the pressure relief hole 14 during installation. This reduces the possibility of misalignment or tilting of the elastic seal 30 during installation, helps the elastic seal 30 to be accurately placed in the mounting hole 12, and improves the installation efficiency of the elastic seal 30.

[0064] Of course, in other embodiments of this application, the first guide portion 35 may also be configured to include a plurality of guide segments spaced apart in the circumferential direction, each guide segment extending in the direction of the pressure relief valve 20 toward the pressure relief hole 14 toward the direction close to the central axis of the pressure relief hole 14.

[0065] like Figures 1-5 As shown, in some embodiments, the resilient seal 30 includes a first guide portion 35, and the end of the wall of the pressure relief hole 14 facing the pressure relief valve 20 has a second guide portion 140. The second guide portion 140 is formed as a conical surface and extends in a direction close to the central axis of the pressure relief hole 14 along the direction of the pressure relief valve 20 toward the pressure relief hole 14. The first guide portion 15 is inserted into the second guide portion 140.

[0066] As can be seen, the first guide portion 35 extends along the direction of the pressure relief valve 20 toward the pressure relief hole 14, towards the direction close to the central axis of the pressure relief hole 14. The second guide portion 140 is a conical surface and extends along the direction of the pressure relief valve 20 toward the pressure relief hole 14, towards the direction close to the central axis of the pressure relief hole 14. The first guide portion 35 and the second guide portion 140 extend in the same direction. Therefore, when installing the elastic seal 30, the operator can align the first guide portion 35 with the second guide portion 140. The first guide portion 35 at least partially engages with the second guide portion 140 in the radial upper limit. The pressure relief valve 20 is installed in the mounting hole 12 of the housing 10. The cooperative design of the first guide part 35 and the second guide part 140 simplifies the installation process. Operators can more easily place the elastic seal 30 in the correct position, reducing installation errors and delays, and improving the installation efficiency of the elastic seal 30. Moreover, a smooth transition zone is formed between the first guide part 35 and the second guide part 140, which helps to reduce the friction between the elastic seal 30 and the hole wall of the pressure relief hole 14 during installation, and reduces the wear of the elastic seal 30 during installation.

[0067] In some embodiments, the resilient seal 30 includes a metal material layer and an elastic material layer, with the elastic material layer covering the metal material layer. The metal material layer has high hardness and strength, resists wear and corrosion, and provides a stable sealing base. The elastic material layer has excellent elasticity and resilience, can closely fit the sealing surface, adapt to minor shape changes and gaps, and can compensate for the deformation of the sealing surface caused by factors such as temperature changes, pressure fluctuations, or mechanical vibrations, thereby maintaining a long-term sealing effect. This composite structure enables the resilient seal 30 to maintain stable sealing performance under different working conditions.

[0068] In some embodiments, the yield strength σ of the metal material layer is ≥ 500 MPa. The high yield strength of the metal material layer allows the elastic seal 30 to maintain shape and dimensional stability under high pressure, thereby improving the pressure-bearing capacity of the elastic seal 30. The elastic material layer is made of nitrile rubber (NBR), fluororubber, polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polyimide (PI), tin, copper, or graphite. These materials typically possess excellent elasticity, wear resistance, and corrosion resistance, enabling the elastic seal 30 to tightly conform to the sealing surface and reduce the risk of leakage. And / or, the contact surface pressure P of the elastic seal 30 satisfies 30 MPa ≤ P ≤ 150 MPa. When the contact surface pressure of the elastic seal 30 is too low... When the contact surface pressure is too low (e.g., P < 30 MPa), the elastic seal 30 may not fit tightly with the sealing surface, which may easily lead to leakage. When the contact surface pressure of the elastic seal 30 is too high (e.g., P > 150 MPa), the excessive contact surface pressure may cause the housing 10, pressure relief valve 20, elastic seal 30, etc. to easily yield, reducing the service life of the elastic seal 30. By setting the contact surface pressure of the elastic seal 30 in the range of 30 MPa to 150 MPa, the elastic seal 30 can fit tightly with the sealing surface, and there will be no excessive friction between the elastic seal 30 and the sealing surface. At the same time, the elastic seal 30 can have good stability when facing external pressure fluctuations or temperature changes.

[0069] In addition, the aforementioned elastic material layer also has good temperature resistance, generally above 150°C, which makes it easier to be used in electric compressors 1 that use high-temperature and high-pressure refrigerants such as carbon dioxide refrigerants.

[0070] It is understood that the contact surface pressure of the elastic seal 30 is less than the yield strength of the metal material layer. For example, the yield strength σ of the metal material layer can be 500MPa, 520MPa, 550MPa, 600MPa, or 650MPa, etc.; the contact surface pressure P of the elastic seal 30 can be 30MPa, 40MPa, 50MPa, 58MPa, 70MPa, 80MPa, 88MPa, 100MPa, 120MPa, or 150MPa, etc.

[0071] like Figure 8As shown, in some embodiments, the outer casing 10 includes a low-pressure casing 16, a bracket 17, and a high-pressure casing 18. The bracket 17 is sandwiched between the low-pressure casing 16 and the high-pressure casing 18, and the bracket 17 and the low-pressure casing 16 define a low-pressure intake chamber 160, and the bracket 17 and the high-pressure casing 18 define a high-pressure exhaust chamber 180, which facilitates the forming and sealing of the high-pressure exhaust chamber 180 and the low-pressure intake chamber 160, and facilitates assembly. The mounting hole 12 and the pressure relief hole 14 are formed on the high-pressure casing 18, and the pressure relief hole 14 communicates with the high-pressure exhaust chamber 180. The pump body structure 19 of the electric compressor 1 is disposed in the high-pressure exhaust chamber 180, and the inlet of the pump body structure 19 communicates with the low-pressure intake chamber 160, and the outlet of the pump body structure 19 communicates with the high-pressure exhaust chamber 180.

[0072] As can be seen, the low-temperature, low-pressure refrigerant in the low-pressure intake chamber 160 can be compressed into a high-temperature, high-pressure refrigerant through the pump body structure 19 and delivered to the high-pressure exhaust chamber 180. The mounting hole 12 and the pressure relief hole 14 are formed on the high-pressure shell 18. The pressure relief hole 14 is connected to the high-pressure exhaust chamber 180. The pressure relief valve 20 is installed in the mounting hole 12 and is connected to the pressure relief hole 14. When the pressure in the high-pressure exhaust chamber 180 is too high, the pressure relief valve 20 can open to relieve pressure and protect the electric compressor 1. The elastic seal 30 is sealed between the bottom wall 120 of the mounting hole 12 and the sealing head 22 of the pressure relief valve 20. By using the above-mentioned elastic seal 30, the risk of yielding deformation of the elastic seal 30 under high-temperature working conditions is reduced, thereby reducing the possibility of refrigerant leakage from the gap between the elastic seal 30 and the bottom wall 120 of the mounting hole 12 and the sealing head 22 of the pressure relief valve 20, and improving the reliability of the electric compressor 1.

[0073] In some embodiments, the electric compressor 1 is a horizontal compressor and is used in a vehicle 3, and the refrigerant used in the electric compressor 1 is carbon dioxide.

[0074] The horizontal rotary compressor has its central axis arranged horizontally, resulting in a lower overall height compared to a vertical compressor. This design helps reduce the wind resistance when the vehicle is in motion, lowers the overall height of the vehicle, and ensures a compact structure for the vehicle's air conditioning system. Furthermore, horizontal rotary compressors are typically equipped with various base mounting options, allowing for selective installation based on the actual conditions of the vehicle, making them more flexible and convenient. Horizontal rotary compressors also have strong environmental adaptability, enabling stable operation under different climates and working conditions, thus meeting the usage needs of the vehicle in different regions and seasons.

[0075] Carbon dioxide, when used as a refrigerant, has a higher intake and exhaust pressure compared to traditional refrigerants. Furthermore, carbon dioxide's excellent thermodynamic properties mean that, when the same cooling capacity is required, the volume of the compression chamber in the electric compressor 1 does not need to be excessively large, allowing for a reduction in the volume of the compression chamber and consequently, the overall size and weight of the electric compressor 1. The electric compressor 1 using carbon dioxide can operate over a wide pressure range, exhibiting stable performance whether performing initial compression under low pressure or deep compression under high pressure. Therefore, the electric compressor 1 of this embodiment facilitates obtaining an optimized compression ratio and provides highly efficient cooling performance when used in a refrigeration system, thereby reducing energy consumption and improving energy utilization. Of course, the refrigerant used in the electric compressor 1 is not limited to this.

[0076] like Figures 1-3 As shown, in some embodiments, the electric compressor 1 further includes a sealing gasket 40, which is fixed to the sealing head 22 and seals between the elastic seal 30 and the sealing head 22. The inner peripheral wall of the sealing gasket 40 has a locking protrusion 42, and the free end of the sealing head 22 has a riveted flange that abuts against the side of the locking protrusion 42 facing the pressure relief hole 14.

[0077] It is evident that by adding a sealing gasket 40 between the sealing head 22 and the elastic sealing element 30, the second sealing part 32 indirectly abuts against the sealing head 22 through the sealing gasket 40, which helps to generate a suitable sealing surface pressure at the elastic sealing element 30. Of course, in this embodiment, the sealing gasket 30 may not be provided between the sealing head 22 and the elastic sealing element 30, such as... Figure 4 and Figure 5 As shown, the second sealing part 32 can directly contact and cooperate with the sealing head 22.

[0078] In addition, the locking protrusion 42 on the sealing gasket 40 and the riveted flange of the sealing head 22 cooperate with each other to form a solid mechanical connection, making the sealing gasket 40 more stable under high pressure or vibration conditions and improving the stability of the sealing gasket 40.

[0079] In this embodiment, the sealing gasket 40 can be a sealing structure that is integrated into the pressure relief valve 20, or the sealing gasket 40 can be integrated into the pressure relief valve 20.

[0080] Optionally, the riveted flange is constructed such that during the installation of the pressure relief valve 20 (e.g., the pressure relief valve 20 is threadedly connected to the housing 10), the pressure relief valve 20 is squeezed between the housing 10, causing the free end of the pressure relief valve 20 to yield and deform, thus forming a riveted flange. In this case, the riveted flange does not require specific processing.

[0081] In some embodiments, the surface roughness of the sealing end face in contact with the elastic seal 30 does not exceed Rz6.3. For example, the surface roughness of the bottom wall of the mounting hole 12 and the portion of the sealing head 22 in contact with the elastic seal 30 does not exceed Rz6.3. By limiting the surface roughness of the sealing end face to no more than Rz6.3, the sealing end face that mates with the elastic seal 30 is relatively smooth. Even if the elastic seal 30 shifts to a certain extent during the installation of the pressure relief valve 20, the aforementioned sealing end face is less likely to cause wear to the elastic seal 30, thereby reducing the wear of the elastic seal 30; and / or, the elastic seal 30 and the hole wall of the mounting hole 12 are circumferentially limited by a limiting structure. The limiting structure includes a limiting protrusion and a limiting groove, with the limiting protrusion engaging... In the limiting groove, when assembling the elastic seal 30, a limiting structure is provided between the elastic seal 30 and the wall of the mounting hole 12. The limiting structure provides a guiding path for the installation of the elastic seal 30. The user can align the limiting protrusion with the limiting groove to achieve the correct position of the elastic seal 30 in the mounting hole 12, thus restricting the circumferential movement of the elastic seal 30. Then, the pressure relief valve 20 is assembled in the mounting hole 12, making the installation of the elastic seal 30 easier. At the same time, by restricting the rotation of the elastic seal 30 relative to the housing 10 in the circumferential direction of the pressure relief hole 14, the possibility of wear on the elastic seal 30 during the installation of the pressure relief valve 20 is reduced, so that the elastic seal 30 has good sealing performance.

[0082] It is understood that the elastic seal 30 may include a metal material layer and an elastic material layer, with the elastic material layer covering the metal material layer. When installing the pressure relief valve 20, if there is a circumferential relative rotation between the elastic seal 30 and the mounting hole 12, it will cause some wear to the elastic material layer in the elastic seal 30. In this embodiment, the surface roughness of the sealing end face and / or the circumferential limit of the elastic seal 30 can be considered to reduce the wear of the elastic material layer during the installation of the pressure relief valve 20, so as to consolidate the sealing reliability and service life of the elastic seal 30.

[0083] For example, the elastic seal 30 and the housing 10 are radially upper limit matched at the pressure relief hole 14, and the surface roughness of the sealing end face in contact with the elastic seal 30 does not exceed Rz6.3; for another example, the elastic seal 30 and the housing 10 are radially upper limit matched at the pressure relief hole 14, and the elastic seal 30 and the hole wall of the mounting hole 12 are circumferentially upper limit matched at the pressure relief hole 14 through a limiting structure; for yet another example, the elastic seal 30 and the housing 10 are radially upper limit matched at the pressure relief hole 14, the surface roughness of the sealing end face in contact with the elastic seal 30 does not exceed Rz6.3, and the elastic seal 30 and the hole wall of the mounting hole 12 are circumferentially upper limit matched at the pressure relief hole 14 through a limiting structure.

[0084] For example, the pressure relief valve 20 and the housing 10 can be connected by threads. When installing the pressure relief valve 20, the elastic seal 30 can be installed in the mounting hole 12 first so that the limiting protrusion and the limiting groove cooperate with each other. Then, the pressure relief valve 20 is installed in the mounting hole 12 by thread connection. During the installation of the pressure relief valve 20, due to the effect of the limiting structure, the elastic seal 30 is not easy to rotate with the pressure relief valve 20, thereby reducing the wear of the elastic seal 30 during the installation of the pressure relief valve 20 and improving the service life of the elastic seal 30.

[0085] It is understandable that the positions of the limiting protrusion and the limiting groove are not specifically limited. For example, the limiting protrusion can be located on the elastic seal 30, and the limiting groove can be located on the wall of the mounting hole 12, or the limiting protrusion can be located on the wall of the mounting hole 12, and the limiting groove can be located on the elastic seal 30. This does not affect the circumferential limiting fit between the elastic seal 30 and the limiting structure of the mounting hole 12. This design allows for flexible selection of the specific position of the limiting structure according to actual conditions to meet different needs and requirements.

[0086] The thermal management system 2 according to a second aspect of the present invention includes an electric compressor 1 according to a first aspect of the present invention.

[0087] According to an embodiment of the present invention, the thermal management system 2, by employing the electric compressor 1 described above, has the advantage of improving the reliability of the thermal management system 2.

[0088] The vehicle 3 according to a third aspect embodiment of the present invention includes an electric compressor 1 according to a first aspect embodiment of the present invention or a thermal management system 2 according to a second aspect embodiment of the present invention.

[0089] According to the embodiments of the present invention, the vehicle 3, by employing the electric compressor 1 or the thermal management system 2 described above, has the advantage of improving the reliability of the vehicle 3.

[0090] It is understood that the specific type of vehicle 3 referred to in the embodiments of this application is not limited. For example, vehicle 3 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, range-extended electric vehicles, solar electric vehicles, gas fuel vehicles (such as hydrogen engine vehicles), or biofuel vehicles (such as vehicles powered by ethanol, biodiesel, etc.).

[0091] Other configurations and operations of the vehicle 3 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0092] Furthermore, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately. In addition, various different embodiments of this application can also be arbitrarily combined, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

[0093] In the description of this invention, it should be understood that the terms "center," "lateral," "length," "thickness," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric compressor characterized by, The utility model relates to an electric compressor, comprising: a housing, a mounting hole is formed on the housing, a pressure relief hole is formed on the bottom wall of the mounting hole; a pressure relief valve is installed in the mounting hole and communicates with the pressure relief hole, the pressure relief valve has a sealing head arranged towards the bottom wall of the mounting hole; an elastic sealing piece is sealed between the bottom wall of the mounting hole and the sealing head and is arranged independently of the housing and the pressure relief valve, the elastic sealing piece is limitedly matched with the housing in the radial and / or circumferential direction of the pressure relief hole, and the elastic sealing piece comprises a first sealing part, a second sealing part and an elastic connecting part, the first sealing part, the second sealing part and the elastic connecting part are all arranged around the outer periphery of the pressure relief hole, the first sealing part abuts against the bottom wall of the mounting hole, the second sealing part abuts against the sealing head, and the elastic connecting part is bently connected between the first sealing part and the second sealing part and is adapted to exert an elastic force on the first sealing part and the second sealing part away from each other in the axial direction of the mounting hole.

2. The electric compressor of claim 1, wherein The first sealing part and the second sealing part are sleeved in the radial direction of the mounting hole, and the elastic connecting part is formed in a tapered shape.

3. The electric compressor of claim 2, wherein The thickness of the elastic sealing piece is t, and 0.2mm≤t≤2mm.

4. The electric compressor according to claim 1, wherein the elastic sealing piece further comprises a first guide part connected to the inner periphery of the first sealing part, and in the longitudinal section of the elastic sealing piece, the first guide part extends towards the direction close to the central axis of the pressure relief hole in the direction of the pressure relief valve towards the pressure relief hole, and is limitedly matched with the end of the pressure relief hole in the radial direction; and / or the fitting gap between the outer periphery wall of the elastic sealing piece and the hole wall of the mounting hole is x, and 0.2mm≤x≤1mm.

5. The electric compressor of claim 4, wherein The second sealing part is sleeved outside the first sealing part, the elastic sealing piece comprises a first guide part, and the first guide part and the elastic connecting part are both formed in a tapered shape.

6. The electric compressor of claim 4, wherein The elastic sealing piece comprises a first guide part, one end of the hole wall of the pressure relief hole has a second guide part, the second guide part is formed in a tapered surface and extends towards the direction close to the central axis of the pressure relief hole in the direction of the pressure relief valve towards the pressure relief hole, and the first guide part is inserted into the second guide part.

7. The electric compressor according to claim 1, wherein the elastic sealing piece comprises a metal material layer and an elastic material layer, the elastic material layer is wrapped outside the metal material layer, the yield strength of the metal material layer is σ≥500MPa, and the elastic material layer is nitrile rubber, fluororubber, polytetrafluoroethylene, polyether ether ketone, polyimide, tin, copper or graphite; and / or the contact surface pressure P of the elastic sealing piece satisfies 30MPa≤P≤150MPa.

8. The electric compressor of claim 1, wherein The outer casing includes a low-pressure casing, a support, and a high-pressure casing. The support is sandwiched between the low-pressure casing and the high-pressure casing, and the support and the low-pressure casing define a low-pressure intake chamber. The support and the high-pressure casing define a high-pressure exhaust chamber. The mounting hole and the pressure relief hole are formed on the high-pressure casing, and the pressure relief hole communicates with the high-pressure exhaust chamber. The pump body structure of the electric compressor is located in the high-pressure exhaust chamber, and the inlet of the pump body structure is connected to the low-pressure intake chamber, while the outlet of the pump body structure is connected to the high-pressure exhaust chamber.

9. The electric compressor of claim 1, wherein The electric compressor is a horizontal compressor used in vehicles, and the refrigerant used in the electric compressor is carbon dioxide.

10. The electric compressor of claim 1, wherein Also includes: A sealing gasket is fixed to the sealing head and seals between the elastic seal and the sealing head. The inner peripheral wall of the sealing gasket has a locking protrusion. The free end of the sealing head has a riveted flange, which abuts against the side of the locking protrusion facing the pressure relief hole.

11. The electric compressor according to any one of claims 1-10, characterized in that, The surface roughness of the sealing end face in contact with the elastic seal does not exceed Rz6.3; and / or, The elastic seal is circumferentially limited to the wall of the mounting hole by a limiting structure, the limiting structure including a limiting protrusion and a limiting groove, the limiting protrusion being fitted into the limiting groove.

12. A thermal management system characterized by, Includes the electric compressor according to any one of claims 1-11.

13. A vehicle characterized by comprising: Includes the electric compressor according to any one of claims 1-11 or the thermal management system according to claim 12.

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