Core body of throttle valve, throttle valve and electric scroll compressor

Abstract

The utility model provides a core body for a throttle valve. The core body is inserted and fixed in a valve housing of the throttle valve. A plurality of main grooves which are connected end to end through connecting grooves from the inlet to the outlet in the flowing direction are formed in the outer surface of the core body. And the connecting groove forms a rotary curve at the head end and the tail end of the main groove. According to the core body for the throttling valve, the length is shortened or the size is reduced under the condition that the pressure loss is fixed, the material cost and the weight of parts are reduced, and therefore the throttling valve can be applied to a small scroll compressor or a scroll compressor with a limited space. The utility model also provides a throttle valve and an electric scroll compressor comprising the throttle valve.

Description

Technical Field

[0001] The utility model relates to a component for adjusting an element and a fluid machine, and more specifically, to a core for a throttle valve, a throttle valve and an electric scroll compressor using the throttle valve. Background Art

[0002] The electric scroll compressor achieves periodic changes in gas volume through the relative movement of the orbiting scroll and the stationary scroll, thereby completing the gas compression and exhaust process. Due to its many advantages such as high efficiency, low noise, and small size, electric scroll compressors have been widely used in central air conditioning, refrigeration systems and other fields.

[0003] Electric scroll compressors are usually used in the thermal management system of new energy vehicles to drive the air conditioning system of the vehicle and provide cooling effect by compressing the refrigerant. Existing electric scroll compressors usually use spiral throttle valves, such as Figure 4 This type of throttle valve has a small pressure resistance, so when the pressure loss is fixed, the volume of the throttle valve will be larger, which will increase the material cost of the throttle valve and further limit the volume reduction of the scroll compressor.

[0004] Therefore, there is a need in the art for a throttle valve with a new structure, which can meet the performance requirements of a small electric scroll compressor with a low-cost structure with a small volume or a short length. Utility Model Content

[0005] The technical problem to be solved by the utility model is to meet the performance requirements of a throttle valve and a compressor with a core body of small volume or short length, thereby reducing the weight and material cost of components.

[0006] To solve the above technical problems, according to one aspect of the utility model, a core body for a throttle valve is provided. The core body is inserted into and fixed in the valve housing of the throttle valve. A plurality of main grooves are formed on the outer surface of the core body from the inlet to the outlet along the flow direction and connected to each other end to end by connecting grooves. The connecting grooves form return bends at the head and tail ends of the main grooves.

[0007] According to a preferred embodiment of the present utility model, the plurality of main grooves are formed along the longitudinal direction of the core body, and the connecting groove forms the return bend at the longitudinal end of the main groove.

[0008] According to a preferred embodiment of the present invention, the plurality of main grooves are formed along the circumference of the core body, and the connecting groove forms the return bend at the lateral end of the main groove.

[0009] According to a preferred embodiment of the present invention, the core is made of plastic, resin, metal or organic glass.

[0010] According to another aspect of the utility model, a throttle valve is provided. The throttle valve comprises a core body and a valve housing. The outer surface of the core body matches the inner surface of the valve housing in shape, and the core body is inserted and fixed in the valve housing. A plurality of main grooves are formed between the core body and the valve housing from the inlet to the outlet along the flow direction and connected to each other end to end by connecting grooves. The connecting grooves form return bends at the head and tail ends of the main grooves.

[0011] According to a preferred embodiment of the present invention, a plurality of main grooves connected end to end with each other through connecting grooves are formed on the outer surface of the core.

[0012] According to a preferred embodiment of the present utility model, a plurality of main grooves connected end to end with each other through connecting grooves are formed on the inner surface of the valve housing.

[0013] According to a preferred embodiment of the utility model, a plurality of main grooves connected end to end with each other through connecting grooves are simultaneously formed on the outer surface of the core body and the inner surface of the valve housing with the same shape and corresponding positions.

[0014] According to another aspect of the utility model, an electric scroll compressor is provided. The electric scroll compressor includes the above-mentioned throttle valve. The inlet end of the throttle valve is connected to the exhaust chamber of the electric scroll compressor, and the outlet end of the throttle valve is connected to the bearing chamber through the oil return channel to introduce the separated lubricating oil into the bearing chamber. The throttle valve includes a core body and a valve housing. The valve housing is a valve hole arranged on the fixed scroll disk of the electric scroll compressor. The outer surface of the core body is matched with the inner surface shape of the valve hole, and the core body is inserted and fixed in the valve hole by an interference fit. A plurality of main grooves are formed between the core body and the valve hole from the inlet along the flow direction to the outlet, and are connected to each other end to end by connecting grooves. The connecting groove forms a return bend at the head and tail ends of the main groove.

[0015] According to a preferred embodiment of the present invention, a plurality of main grooves connected end to end with each other through connecting grooves are formed on the outer surface of the core.

[0016] Compared with the core of the existing spirally structured throttle valve, the core of the throttle valve of the utility model is shorter in length or smaller in volume, thereby reducing material costs and component weight, and thereby enabling the throttle valve to be applied to small or space-limited scroll compressors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to enable those skilled in the art to more fully understand the present invention, the specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 A cross-sectional view of an electric scroll compressor.

[0019] Figure 2 It is a longitudinal cross-sectional view of the core of the throttle valve of the utility model;

[0020] Figure 3 for Figure 2 A three-dimensional diagram of the core;

[0021] Figure 4 It is a three-dimensional diagram of the core of the throttle valve in the prior art. DETAILED DESCRIPTION

[0022] In order to make the present invention clearer, a specific embodiment of the present invention is described in detail below with reference to the accompanying drawings, but the present invention is not limited to the embodiment described below.

[0023] It should be noted that the directional terms used in this article, such as "up" and "down", "top", and "bottom", are only for the convenience of explaining the structure of the product with reference to the drawings. The directions represented are only shown as up and down and top or bottom in the drawings, and do not represent the actual usage direction of the product.

[0024] In order to facilitate the understanding of the inventive concept of the utility model, first, refer to Figure 1 The structure and working principle of the electric scroll compressor 1 of the present invention are described.

[0025] As shown in the figure, the electric scroll compressor 1 includes a housing 11, a top cover 12, a fixed scroll 13, a movable scroll 14, a drive shaft 15, a bearing support 16, an eccentric block 17, a throttle valve 2 and other components. The fixed scroll 13 and the movable scroll 14 are arranged in the housing 11, and the top cover 12 is covered above the housing 11. An exhaust chamber 3 is formed between the fixed scroll 13 and the top cover 12. The lower part of the movable scroll 14 is fixed on the bearing support 16 and is connected to the drive shaft 15 through the eccentric block 17. A bearing chamber 4 is formed between the movable scroll 14 and the bearing support 16.

[0026] When the electric scroll compressor 1 is working, the motor drives the movable scroll 14 through the drive shaft 15, so that the movable scroll 14 rotates, thereby causing relative movement between the movable scroll 14 and the fixed scroll 13, and the volume of the compression chamber between the movable scroll 14 and the fixed scroll 13 gradually decreases to compress the refrigerant gas therein. The compressed gas enters the exhaust chamber 3 through the exhaust port 5, and after oil and gas separation, the separated lubricating oil flows back to the bearing chamber 4 through the throttle valve 2 on the fixed scroll 13 and the return oil channel 6 on the bearing support 16 to lubricate the bearing pair therein, thereby increasing the efficiency and service life of the compressor. The schematic flow path of the lubricating oil can be seen in Figure 1 As indicated by the arrow in .

[0027] In the flow path of the lubricating oil, the throttle valve 2 plays an important role and is an important component in the lubricating oil recovery process. The lubricating oil enters the throttle valve 2 from the exhaust chamber 3, moves along the flow path in the throttle valve 2, and is subjected to pressure resistance, so that the pressure of the fluid gradually decreases. After meeting the pressure loss requirements, it enters the bearing chamber 4 through the oil return passage.

[0028] The throttle valve is one of the important components in the electric scroll compressor, and plays an important role in the system efficiency and stability of the electric scroll compressor. In the electric scroll compressor, the lubricating oil after oil-gas separation will pass through the throttle valve to be refluxed while regulating the pressure. The throttle valve can also isolate the exhaust chamber and the bearing chamber by filling the lubricating oil.

[0029] In the prior art, Figure 4 As shown, the throttle valve is usually a spiral throttle valve, that is, a spiral groove is formed on the outer circumference of the cylindrical core 200. After the core is inserted into the valve hole on the fixed scroll disk, a spiral flow path is formed between the two through the groove. Such a spiral flow path is a smooth flow path with small pressure resistance from the inlet along the flow path to the outlet, so the pressure loss of the fluid is small. In order for the throttle valve to meet the pressure regulation requirements in the scroll compressor, the fluid flow path of the throttle valve needs to be kept long enough, thereby increasing the total volume or length of the throttle valve. This will also limit the reduction in the volume of the electric scroll compressor.

[0030] In view of this situation, the inventor of the present utility model has designed a new core 20 for a throttle valve 2. According to the inventive concept of the present utility model, the flow path of the new core 20 includes a plurality of return bends 24. That is, a plurality of main grooves 23 are formed on the outer surface of the core 20 from the inlet 21 to the outlet 22 along the flow direction, and are connected to each other end to end through connecting grooves. The connecting groove forms return bends 24 at the head and tail ends of the main grooves 23. The existence of these return bends 24 increases the pressure loss of the fluid at these return bends 24, so that the throttle valve 2 of the same volume or length can achieve a greater pressure loss. In other words, under the same pressure loss, compared with the spiral throttle valve, the length or volume of the throttle valve 2 of the present utility model can be smaller, thereby reducing the material cost and component weight. This makes the throttle valve 2 of the present utility model suitable for small or space-limited compressors. The term "return bend" used in this article refers to a turn in the flow path, and the return angle is defined in this article as the angle between the inflow path and the outflow path of the fluid, which is less than 180 degrees. A 180-degree rotation angle can be understood as the fluid flowing forward along a straight path without turning, or can be understood as flowing forward along a tangential direction. A 0-degree rotation angle can be understood as the fluid turning around and flowing in the opposite direction, such as Figure 3 As shown. A turning angle of 0 degree is preferred. In the spiral flow path of the prior art, the fluid flows roughly tangentially along the surface of the core 20, so there is no turning bend 24 between the inflow path and the outflow path of the fluid.

[0031] The following will refer to Figure 2 and Figure 3 To further illustrate a specific structure of the core 20 used for the throttle valve 2 of the utility model.

[0032] As shown in the figure, the flow path on the core 20 of the throttle valve 2 of the utility model includes a plurality of return bends 24. These return bends 24 increase the resistance of the fluid flowing therethrough, thereby increasing the pressure drop, and thus being able to reduce the volume or length of the core 20 at the same pressure drop. Any structure that adds return bends 24 in the flow path falls within the protection scope of the utility model.

[0033] The core 20 may be made of a material such as resin, plastic, organic glass, metal or nylon, so as to have a certain degree of contraction when it is inserted into a valve housing to form a throttle valve.

[0034] According to one embodiment of the utility model, the flow path of the core 20 is a plurality of main grooves 23 connected end to end, and the return bend 24 is located at the interconnected ends of adjacent main grooves 23. The grooves connecting adjacent main grooves 23 are defined as connecting grooves. The tail end of a main groove is connected to the head end of an adjacent main groove through a connecting groove to form a return bend 24. After all the main grooves are connected together, a continuous flow path is formed starting from the head end (inlet) of the first main groove to the tail end (outlet) of the last main groove. In this article, the head end and tail end of a main groove are defined according to the direction in which the fluid flows therein, and the fluid flows from the head end of the main groove along the main groove to the tail end. The multiple main grooves 23 are preferably parallel to each other, such as Figure 3 Such a structure is convenient for processing and manufacturing.

[0035] The shape of the core 20 is not limited. Figure 2 and Figure 3 FIG. 2 shows a preferred embodiment of the shape of the core 20, which is a cylinder. A plurality of main grooves 23 are formed on the outer surface of the core 20 along the longitudinal direction. These main grooves are preferably substantially parallel to the longitudinal axis of the core 20. Adjacent main grooves are connected at the head and tail by connecting grooves to form a return bend 24 by the connecting grooves. Figure 3 As shown, the main groove and the connecting groove are preferably connected by a rounded corner. As an optional embodiment, the main groove and the connecting groove can also be connected by a right angle. The shape of the connecting groove itself is not limited, and can be a straight groove or a curved groove.

[0036] Considering the difficulty of processing, these main grooves 23 are preferably parallel to the longitudinal axis of the core body, but are not limited thereto. A plurality of main grooves 23 can also be formed along the surface of the cylindrical core body 20 parallel to each other but inclined relative to the longitudinal axis. The return bends 24 are formed at both longitudinal ends of the main grooves 23.

[0037] According to another embodiment of the utility model, a plurality of main grooves 23 can be formed along the circumference of the core 20, for example, along the circumference of a cylinder, that is, a plurality of main grooves 23 are formed as arc-shaped grooves along the surface of the cylinder. These main grooves are parallel transverse grooves when viewed from the front of the core 20. The head and tail of adjacent main grooves in these arc-shaped main grooves are connected by connecting grooves to form a return bend 24. That is, the return bend 24 is formed at both transverse ends of the main groove 23.

[0038] Any technical solution in which a return bend 24 is formed in the flow path of the core 20 falls within the protection scope of the present utility model. The drawings in the specification of the present application only show a preferred embodiment in which a flow path that turns up and down is formed on a cylindrical core 20, but are not limited thereto. The shape of the core 20 is not limited to a cylinder. Based on the inventive concept of the present utility model, those skilled in the art can make various modifications to the illustrated embodiments.

[0039] For example, it is conceivable that, according to another embodiment of the present invention, the core 20 may be a prism. Considering the difficulty of processing, the core 20 is preferably a regular prism. In this case, the flow path may be a groove formed along the side of the prism in a spiral. The groove forms a return bend 24 at the adjacent side. Such a return bend 24 can also increase the pressure resistance of the fluid at that location.

[0040] According to another aspect of the utility model, a throttle valve 2 is provided. The throttle valve 2 includes a core body 20 and a valve housing (not shown), wherein the outer surface of the core body 20 matches the shape of the inner surface of the valve housing, and the core body 20 is inserted and fixed in the valve housing. That is, the shape of the outer surface of the core body 20 is the same as the shape of the inner surface of the valve housing, so that the two can fit tightly. The shape of the outer surface of the valve housing is not limited and can be set to any shape according to its application scenario. A flow path is formed between the core body 20 and the valve housing from the inlet 21 to the outlet 22 along the flow direction, and the flow path is a plurality of main grooves 23 connected to each other end to end by connecting grooves, and wherein the connecting grooves form a plurality of return bends 24 at the head and tail ends of the main grooves 23.

[0041] In the throttle valve 2, the flow path may be formed on the outer surface of the core 20, and the valve hole may have a smooth inner surface. Alternatively, the flow path may be formed on the inner surface of the valve hole, in which case the core 20 may have a smooth outer surface. According to the configuration of the above embodiment, the core 20 may be directly inserted into the valve hole during installation.

[0042] Of course, it is also possible to consider forming a flow path on both the outer surface of the core 20 and the inner surface of the valve hole, but in this case, it is necessary to limit the matching position of the two, so that the flow path on the core 20 and the flow path on the valve hole correspond in position and keep the same shape after assembly. In this case, an assembly positioning structure (for example, a guide structure) needs to be added to ensure installation accuracy.

[0043] According to a preferred embodiment, the core 20 is inserted into the valve housing by interference fit, and a flow path from the inlet to the outlet is formed between the two. That is, the outer diameter of the core 20 is slightly larger than the inner diameter of the valve housing, so that the core 20 can be fixed in the valve housing after being inserted into the valve housing. The fluid flows along the flow path of the throttle valve 2 and encounters resistance, so that the pressure gradually decreases to meet the throttling pressure regulation requirements of the application scenario.

[0044] The valve housing may be made of a rigid material, preferably a metal material.

[0045] According to another aspect of the present invention, an electric scroll compressor 1 is provided, which is an application scenario of the throttle valve 2. Figure 1 As shown, the throttle valve 2 is applied to the electric scroll compressor 1. In this case, the valve housing is a valve hole arranged in the fixed scroll plate 13 of the compressor. The throttle valve 2 of the utility model is arranged in the fixed scroll plate of the electric scroll compressor 1, and is used to connect the exhaust chamber and the bearing chamber 4 of the electric scroll compressor 1, so as to guide the lubricating oil separated from the refrigerant into the bearing chamber 4 with a certain pressure drop, so as to lubricate the components arranged in the bearing chamber 4.

[0046] The inlet end of the throttle valve 2 is connected to the exhaust chamber 3, and the outlet end of the throttle valve 2 is connected to the bearing chamber 4 through the oil return channel 6 to introduce the separated lubricating oil into the bearing chamber 4. The core 20 is accommodated in the valve hole in a shape-fitting manner, and a flow path from the inlet 21 to the outlet 22 is formed between the core 20 and the valve hole, and the flow path is a plurality of main grooves 23 connected to each other end to end through connecting grooves. The flow path of the throttle valve 2 of the electric scroll compressor 1 of the utility model includes a plurality of return bends 24, which are formed by connecting grooves at the head and tail ends of the main grooves 23. These return bends 24 increase the resistance of the fluid flowing through here, thereby increasing the pressure drop, thereby reducing the volume, length or weight of the throttle valve 2, and thus reducing the total volume and cost of the electric scroll compressor 1.

[0047] The utility model has the following beneficial technical effects: the flow path of the throttle valve adopts an up-and-down or left-and-right rotary arrangement, and there are several return bends in the flow path. Due to the large pressure loss at the return bends, the throttle valve of the utility model can be shorter and smaller in size than the existing spiral throttle valve, which is more conducive to arrangement in a compressor with limited space, and the corresponding weight and material costs are also reduced.

[0048] The above specific embodiments are only used to illustrate the present invention, but not to limit the present invention. Those skilled in the art can make various modifications and variations without departing from the inventive concept of the present invention, so all equivalent technical solutions fall within the protection scope of the present invention, and the protection scope of the present invention is defined by the attached claims.

Claims

1. A core (20) for a throttle valve (2), characterized in that: The core body (20) is inserted into and fixed in the valve housing of the throttle valve (2), and a plurality of main grooves (23) are formed on the outer surface of the core body (20) from the inlet (21) to the outlet (22) along the flow direction, and are connected to each other end to end through connecting grooves, wherein the connecting grooves form return bends (24) at the head and tail ends of the main grooves (23).

2. The core (20) according to claim 1, characterized in that: The plurality of main grooves (23) are formed along the longitudinal direction of the core (20), and the connecting groove forms the return bend (24) at the longitudinal end of the main groove (23).

3. The core (20) according to claim 1, characterized in that: The plurality of main grooves (23) are formed along the circumference of the core (20), and the connecting groove forms the return bend (24) at the lateral ends of the main grooves (23).

4. The core (20) according to any one of claims 1 to 3, characterized in that: The core (20) is made of plastic, resin, metal or organic glass.

5. A throttle valve (2), characterized in that: The throttle valve (2) comprises a core body (20) and a valve housing, wherein the outer surface of the core body (20) matches the inner surface of the valve housing in shape, and the core body (20) is inserted into and fixed in the valve housing, wherein a plurality of main grooves (23) are formed between the core body (20) and the valve housing, extending from an inlet (21) to an outlet (22) along a flow direction and connected end to end with each other through connecting grooves, wherein the connecting grooves form return bends (24) at the head and tail ends of the main grooves (23).

6. The throttle valve (2) according to claim 5, characterized in that A plurality of main grooves (23) connected end to end with each other by connecting grooves are formed on the outer surface of the core (20).

7. The throttle valve (2) according to claim 5, characterized in that A plurality of main grooves (23) connected end to end with each other by connecting grooves are formed on the inner surface of the valve housing.

8. The throttle valve (2) according to claim 5, characterized in that A plurality of main grooves (23) connected end to end to each other via connecting grooves are formed on the outer surface of the core (20) and the inner surface of the valve housing in the same shape and corresponding positions.

9. An electric scroll compressor (1), characterized in that: The electric scroll compressor (1) comprises a throttle valve (2) according to any one of claims 5 to 8, wherein an inlet end of the throttle valve (2) is connected to an exhaust chamber (3) of the electric scroll compressor (1), and an outlet end of the throttle valve (2) is connected to a bearing chamber (4) through an oil return passage (6) so as to introduce the separated lubricating oil into the bearing chamber (4), The throttle valve (2) comprises a core (20) and a valve housing, wherein the valve housing is a valve hole arranged on the fixed scroll (13) of the electric scroll compressor (1). The outer surface of the core (20) matches the shape of the inner surface of the valve hole, and the core (20) is inserted into and fixed in the valve hole by interference fit, wherein a plurality of main grooves (23) are formed between the core (20) and the valve hole from the inlet (21) along the flow direction to the outlet (22), and are connected to each other end to end by connecting grooves, wherein the connecting grooves form return bends (24) at the head and tail ends of the main grooves (23).

10. The electric scroll compressor (1) according to claim 9, characterized in that: A plurality of main grooves (23) connected end to end with each other by connecting grooves are formed on the outer surface of the core (20).

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