Bladeless fan in fluid pipe

文档序号:1510068 发布日期:2020-02-07 浏览:5次 中文

阅读说明:本技术 流体管中的无叶风扇 (Bladeless fan in fluid pipe ) 是由 曼凯·曼纳查特 于 2018-05-03 设计创作,主要内容包括:一种在流体管中的无叶风扇,所述无叶风扇包括:双层中空管被分成外层和内层,使得流体吸入层形成外层(8),并且流体释放到内层(9)将中空管围绕管的周边放置在水平位置和至少一个位置;单个中空管附接外层流体入口(8)和内层流体释放(9),其中来自内层流体释放(9)的流体流动通过单个中空管而不是两个中空管的内层。外层流体入口(8)将接收来自分离管(4)的流体。无叶风扇可引起压力和面积减小,流体力学以恒定速度或在接近单个中空管处发生。(A bladeless fan in a fluid pipe, the bladeless fan comprising: the double-layered hollow tube is divided into an outer layer and an inner layer, such that the fluid intake layer forms an outer layer (8) and the release of fluid to the inner layer (9) places the hollow tube in a horizontal position and at least one position around the circumference of the tube; a single hollow tube attaches the outer layer fluid inlet (8) and the inner layer fluid release (9), with fluid from the inner layer fluid release (9) flowing through the single hollow tube rather than the inner layers of the two hollow tubes. The outer fluid inlet (8) will receive fluid from the separator tube (4). Bladeless fans can cause a pressure and area reduction, with hydrodynamics occurring at constant speed or close to a single hollow tube.)

1. A bladeless fan in a fluid conduit substantially comprising,

the double-layered hollow tube is divided into an outer layer and an inner layer, such that the fluid intake layer forms an outer layer (8) and the release of fluid to the inner layer (9) places the hollow tube in a horizontal position and at least one position around the circumference of the tube,

and/or the presence of a gas in the gas,

a single hollow tube attaches the outer layer fluid inlet (8) and the inner layer fluid release (9), with fluid from the inner layer fluid release (9) flowing through the single hollow tube rather than the inner layers of the two hollow tubes. The outer layer fluid inlet (8) will not receive fluid from the outer layers of the two hollow tubes, but will receive fluid from a separate tube that is not a single hollow tube.

2. The bladeless fan in a fluid duct of claim 1, wherein a welded tube is formed at the fluid outlet by periodically spacing the fluid outlet from the inner layer, wherein the fluid suction point from the outer layer and the fluid release to the inner layer, the inner layer horizontally places the hollow tube around a circumference of the tube.

3. Bladeless fan in a fluid duct according to any of claims 1-2, characterized by consisting of a fluid sorting device (16) such that its properties are such that solids adhere to the duct and the hollow tubes in various sizes of tubes. The hollow tube is adapted to a honeycomb shape or a compact shape.

4. Bladeless fan in a fluid pipe according to any of claims 1-3, wherein the top of the bladeless fan (2) is attached to a lower bladeless fan (3) with a characteristic design for separation, and there is fluid from the outer layer and release of fluid to the inner layer, such that the hollow pipe is placed in at least one position horizontally around the circumference of the pipe.

5. Bladeless fan in a fluid duct according to any one of claims 1-4, wherein at the top of the bladeless fan (2), there is a separation duct (4) at the upper bladeless fan for use in areas where no separation duct is present in the system, or both.

6. Bladeless fan in a fluid duct according to any of claims 1-5, wherein the fluid sorting device (16) is adapted to be mounted below the lower bladeless fan (3).

7. Bladeless fan in a fluid duct according to any of claims 1-3, wherein by form 2 the bladeless fan attached or melted to the duct can be attached to the hollow tube (1) or some way for access to the hollow tube (1), or attached to both sides of the bladeless fan.

8. The bladeless fan in a fluid duct of any one of claims 1-3, wherein the two-layer hollow tube is formed as a single tube by form 3.

9. Bladeless fan in a fluid duct according to claim 3, wherein the mounting of the fluid sorting device (16) is in place before or after the inner layer fluid release (9) or both.

10. The bladeless fan in a fluid duct according to any one of claims 1-6, wherein the process of the bladeless fan comprises: the hollow tube (1), the upper bladeless fan (2) and the lower bladeless fan (3) are such that the fluid flows out of the hollow tube (1), which has two parts, namely the outer layer and the inner layer. The fluid in the outer layer flows into the assembled bladeless fan to maintain a constant or close flow rate of the fluid. When the two fluid layers flow from the hollow tube (1) to the placement of the upper bladeless fan, the upper and lower bladeless fans are assembled at the area of the bladeless fan. Fluid from the outer hollow tube (1) passes through the outer fluid inlet (8) and then flows to the inner fluid discharge (9). Thus, the fluid from the inner hollow tube (1) flows instead. This results in a continuous flow throughout the region. The upper bladeless fan section has a separator tube (4), the fluid from the inner hollow tube (1) having two directions of flow towards the separator tube (4), while the other passes the two-stage bladeless fan through the hollow tube attached thereto. This allows the velocity of the fluid in the hollow tube (1) to be kept constant or close along the path, even in the case of a separation tube (4).

11. Bladeless fan in a fluid duct according to any one of claims 1-5, wherein more than 2 bladeless fan components are designed to combine the upper bladeless fan (2) and the lower bladeless fan (3). But is an assembled system or similar system that works with the same principles of the present invention.

12. The bladeless fan in a fluid duct of any one of claims 1-11, wherein the fluid movement process embodiments describing the overall system process comprise:

fluid flows from a fluid source (100) through the conduit (101), with the line images in the figures representing the entire conduit. As the fluid enters the tube (101), the fluid will have a constant velocity or a velocity close to that from the fluid source (100). As fluid flows past the bladeless fan mounting point (201), the bladeless fan will operate as the fluid density changes. The fluid passing through (201) will flow along the duct to the point where the bladeless fan is mounted (202) and pass to a separation duct which moves the fluid in two directions: bladeless fan mounting point (203) and termination point (304) which causes the area near the bladeless fan (202) to change density. This causes the bladeless fan (202) to release additional fluid to accelerate the flow of fluid from the blocked tube to maintain the velocity of the two separate tubes constant or close. Thus, the conduit that divides into the endpoints (304) has a constant velocity or a velocity that is close to that from the fluid source (100). Fluid flowing through the duct to the bladeless fan mounting point (203) will flow further along the duct (203). The fluid in the duct will have a constant or near velocity and flow to the bladeless fan mounting point (204). The fluid flows through the pipeline to the separator 2. There are endpoints (301) that are separated from the bottom of the graph. The fluid divided into endpoints (301) will have a constant or close velocity. Bladeless fans (201), (202), (203), and (204) maintain a constant or near constant velocity in the duct. Another way is for the fluid to flow into the separator tube and to the bladeless fan mounting point (205), and as the fluid passes (205) to the separator tube, it forms a bi-directional junction. There is an end point (303) and a bladeless fan mounting point (206). The separation conduit flowing to endpoint (303) will have a constant velocity throughout the conduit. Even if the angle of the tube splits again. Because the bladeless fan mounting point (205) will provide additional fluid before the mounting point more quickly distributes the density constant. The separator tube flowing to the bladeless fan mounting point (206) will have a constant or close velocity. Fluid flows from the bladeless fan mounting point (205) to the bladeless fan mounting point (206), and when the fluid is delivered (206) from the fluid source (100) to the destination (302) at a constant or near speed.

13. Bladeless fan in a fluid duct according to any of claims 1 or 12, characterized in that the duct (101) is a single hollow tube. The fluid source (100) is split into at least two sources such that fluid flows to the duct (101) and fluid is split to the bladeless fan at another fluid source.

14. Bladeless fan in a fluid duct according to any of claims 1 or 12, characterized in that the duct (101) is a single hollow tube. The fluid source (100) has a single source with a fluid separator tube (101) and a fluid tube to the bladeless fan with fluid from the same fluid source.

15. Bladeless fan in a fluid duct according to claim 2, wherein the mounting of small hollow or choke tubes can be made by attaching to one inner layer of the upper or lower bladeless fan, which is then connected to the opposite side, or attaching small hollow or choke tubes to one or the other.

16. The bladeless fan in a fluid duct of claim 8, wherein the melting or shaping is accomplished by melting the entire duct system or by partial melting, and wherein if there is more than one bladeless fan position in the melting process, each component is melted and assembled into the duct system.

Technical Field

The present invention relates to the field of physics and engineering, and in particular to equipment for bladeless fans in fluid ducts.

Background

Today, various fluid pipeline systems have speed increase and speed maintenance requirements, such as air pipelines, petroleum pipelines, and reject pipelines, etc. designed by engineering calculations to accommodate specific operations by selecting pipeline size, pipeline installation systems, pressure and speed maintenance equipment, or power sufficient to propel from the source to the destination. There will be differences in the resulting work that have weaknesses. It is suitable for specific tasks, but it is not general. An additional solution is to increase the number of liquid sources at various points to reduce the length of piping that can easily control pressure, but this approach is more expensive to use in the industry. Another popular approach is to use a liquid pressure raising device, but there are disadvantages. The pressure at the source is stronger but the pressure at the destination will drop. This problem can be solved by adding some means inside the duct, such as a turbo fan, to constantly accelerate or maintain the speed. By using a fan inside the duct to increase the speed of movement or inside the duct, the disadvantage is that many devices are required, more noise is generated and more energy is consumed.

Patent WO 2010/109169 a2 discloses a device with a turbine or bladeless fan and a generator. The turbine is located in a channel like a pipe to transport a fluid, such as water, air, etc., and out in a spiral fashion. This is different from the present invention. The fluid is characterized as flowing in a continuous spiral pattern. And when used in a pipeline, it requires higher energy than a directly flowing fluid. Unlike the present invention, the direction of the fluid is forward flow.

Patent EP 2623328B 1 discloses a dry blower. It consists of a long tube with an internal fan to accelerate and install it throughout the pipeline. Which has an air flow, an air passage and an internal heating means, which is different from the present invention. This patent has an internal heating device and a single tube type. The installation of internal fans cannot be used in ductwork in a building because it is difficult to maintain when one fan fails. This is difficult to change because the pipes and walls inside the building are closed.

Patent WO2006/078434 a2 discloses fluid movement and water movement in a cavity. A device with a fan and a motor is used in the cavity, which is different from the present invention. Because this patent uses more equipment and uses a fan with a propeller that requires more energy costs and is difficult to maintain.

The invention will be shown in this description, which requires less energy and is easy to maintain due to fewer devices and fans with no blades and no or light sound. This applies to buildings or pipe systems in the building industry and in the oil and gas industry.

Summary of The Invention

The present invention provides a bladeless fan in the disclosed fluid duct.

It is an object of the present invention to create a special duct with a bladeless fan within the duct, such that the fan increases the fluid flow velocity, such as air or liquid, within the duct along the duct at a constant or near constant velocity.

The invention features an apparatus having a bladeless fan. The bladeless fan is fixed to the pipe and is periodically placed or produced in a double-walled manner. The inner layer is a pipe used in the general fluid industry. The outer layer is attached to the inner layer by fluid conduits that flow in the same direction for adding fluid to the inner layer, which fluid keeps the fluid velocity constant or close. The invention also adds a fluid sorting device which can control the fluid in the inner pipe to move to a required shape.

Drawings

For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. In the drawings, like numbering represents like parts:

fig. 1 shows a bladeless fan and fluid circuit according to form 1 of an embodiment of the present invention.

Fig. 2 shows a bladeless fan, a fluid duct and a fluid sorting device according to form 2 of an embodiment of the present invention.

Fig. 3 shows the combination of a hollow tube (1), an upper and a lower bladeless fan (3) of a bladeless fan (2) according to the present invention.

Fig. 4 shows an interior or sectional view of a hollow tube (1) according to the invention and a top view of a bladeless fan (2).

Fig. 5 shows a view of the attachment means of the hollow tube (1) and the lower bladeless fan (3) according to the present invention.

Fig. 6 shows an internal or sectional view of a lower bladeless fan (3) according to the invention.

Fig. 7 shows a fluidic sorting device (16) with a conduit according to the invention.

Fig. 8 shows an internal or cross-sectional view of the upper bladeless fan (3) and the fluid sorting device (16) according to an embodiment of the present invention.

Fig. 9 shows a bladeless fan on a form 3 fluid duct in accordance with an embodiment of the present invention.

FIG. 10 shows a schematic block diagram of an embodiment of a fluid movement process in the present invention.

Detailed Description

According to an aspect of the invention, a bladeless fan in a fluid pipe comprising two layers of hollow tubes is divided into an outer layer and an inner layer. There is a suction of fluid into the outer layer (8) and a release of fluid into the inner layer (9). Placing the hollow tube in at least one of horizontal positions around the circumference of the tube. Furthermore, a welded tube may be formed at the fluid outlet by periodically spacing the welded tube from the inner layer, similar to a small hollow or choke tube. At this location, the fluid intake point from the outer layer and the fluid is released to the inner layer, which places the hollow tube in a horizontal orientation around the circumference of the tube, which is known as a bladeless fan.

The invention of a double-layer hollow tube can design the fan in the fluid tube in three forms: 1. as a bladeless fan, the components attached to the duct are separated. 2. As a bladeless fan attached to a tube. 3. The two hollow tubes are melted into a single tube.

Form 1: a bladeless fan-like device is built up as shown in fig. 1 and can be placed on a pipe as shown in fig. 2, but also in a fluid sorting device consisting of a pipe consisting of hollow pipes (1), characterized by two hollow pipes, an outer layer and an inner layer, attached at the top of the bladeless fan (2) with a separation pipe (4), for transporting the fluid along the pipe, depending on the respective engineering field. The upper bladeless fan is attached to a lower bladeless fan (3) having a characteristic design for separation, releasing fluid from the outer layer to the inner layer. Placing the hollow tube in at least one position horizontally around the circumference of the tube.

In order to consider the attachment of the hollow tube (1) and the top of the bladeless fan (2), it is shown in fig. 4. The top view of fig. 4 shows the top view when the separation tube (4) is turned to the upper part and the hollow tube (1) is turned to the left. The top of the bladeless fan is located in the middle (2), while the lower bladeless fan (3) is located on the right side. The sectional view on the axis a (6) is (7). The special feature is a hollow tube which can protrude and open end which positions the same axis to the separation tube (4). When considering circle B, the following details will be seen: the outer fluid inlet (8) and inner fluid discharge (9) become bladeless fans, consisting of a part of the hollow tube (1) at the area of the upper bladeless fan (2) and a part of the lower bladeless fan (3), which keeps the fluid velocity constant or close in the tube and the separation tube (4).

Consider the attachment means of the hollow tube (1) and upper bladeless fan (2) as shown in fig. 5. The top image of fig. 5 depicts a top view when turning the separator tube (4) to the top and the lower bladeless fan (3) to the right. The cross-sectional view of axis C (11) is (12), which shows the wall of the component. When considering circle D, the wall of the lower bladeless fan (3) protrudes like a bird beak. The curves and the shape of the ceiling (10) are here waiting to be assembled into a bladeless fan. The welded tube where the fluid is released may be periodically installed to the inner layer. It is characterized by being both a small hollow tube and a blocking tube. The one end is attached to (10).

To consider the lower bladeless fan (3) as shown in fig. 6, the upper left image shows the lower bladeless fan (3) and the right side shows a top view of the lower bladeless fan (3). When the bottom bladeless fan (3) is cut along the axis of symmetry E (13), the image is E-E (14), which E-E (14) is an interior view. To account for the circle F, there is a finished hollow tube (15), and the welded tube can be periodically installed at the surface of the finished hollow tube (15) where the fluid is released to the inner layer. It is characterized by being both a small hollow tube and a blocking tube. The other side of the small hollow or occlusion tube is attached to (10) by placing a wire. In the case where more than one line is placed, this is a periodic position. Suitable spacing is each spaced line having an equal spacing or similar spacing measured from the perimeter of the region (10) and/or (15) one or the other. The installation of small hollow or choke tubes can be made by attaching to one inner layer of the upper or lower bladeless fan, which is then connected to the opposite side, or attaching small hollow or choke tubes to one or the other.

Fig. 7 shows the fluid sorting device in various views shown in the drawings and depicts the installation of the fluid sorting device (16). The fluid sorting device (16) is adapted to be mounted below the lower bladeless fan (3). Its characteristic is that solids adhere to the pipe. Inside pipes of various sizes, such as honeycomb (or tight), there are hollow pipes for adequate fluid flow. It can be designed in any form. The appropriate form depends on the length of the fluid sorting device (16) and the use of the internal hollow tube mounting. The length of the deployment device varies with pressure drop and increases friction within the tube. If the design is too short, it will not be possible to arrange fluid lines. The velocity and pressure inside the flow tube and the hollow tube dimensions must be calculated relatively. The appearance of the arrangement emerging from the inner hollow tube (17) can be seen in the top view of the bottom image in fig. 7. The designation must be carefully designed in polygonal form (such as triangular and square, etc.) because the polygon will heat up when the fluid moves to high speeds where it is not suitable.

When the lower bladeless fan is connected to the fluid sorting apparatus along the axis of symmetry J, it shows an image of the fluid flow through the channel, as shown in the lower left corner. When the upper bladeless fan is attached at the symmetry axis G, the image is in the upper right corner. A bladeless fan is seen in circle H, which enlarges circle H to the right image below.

The process of bladeless fans in fluid ducts is divided into 2 cases, including:

case 1: this process will occur when the hollow duct (1), the upper bladeless fan (2) and the lower bladed fan (3) are assembled together. The fluid flows out of a hollow tube (1) having two parts: an outer layer and an inner layer. The internal fluid is a fluid used in the piping system. The fluid in the outer layer flows into the assembled bladeless fan to maintain the velocity of the fluid constant or close. When the two fluid layers flow from the hollow tube (1) to the placement of the upper bladeless fan, the upper and lower bladeless fans are assembled at the area of the bladeless fan. Fluid from the outer hollow tube (1) passes through the outer fluid inlet (8) and then flows to the inner fluid discharge (9). This results in fluid movement to the downward bladeless fan. The pressure in this region decreases. Thus, the fluid from the inner hollow tube (1) flows instead. This results in a continuous flow throughout the region. The upper bladeless fan section has a separator tube (4), the fluid from the inner hollow tube (1) having two directions of flow towards the separator tube (4), while the other passes the two-stage bladeless fan through the hollow tube attached thereto. This causes the velocity of the fluid in the hollow tube (1) to be constant or close along the path, even in the separation tube (4).

Case 2: when the hollow pipe (1), the upper bladeless fan (2), the lower bladeless fan (3) and the fluid arrangement device (16) are assembled together. The operation is similar to case 1 and when the fluid flows through the lower bladeless fan and into a fluid sorting device (16) mounted beside or in the lower bladeless fan or into the other, the fluid is arranged in the shape of the inner hollow tube of the bladeless fan (17). This allows fluid to flow smoothly on the line. The fluid sorting device (16) may be installed in all areas of the hollow tube (1), except for the outer fluid inlet (8) and the inner fluid discharge (9), i.e. before or after the inner fluid discharge (9) or both. The most suitable location is in the vicinity of the separator tube (4).

Form 1 may reduce the separator tube (4) at the upper bladeless fan for use in areas of the system where no separator tube is present. The upper bladeless fan (2) and the lower bladeless fan (3) may be separated into two or more parts and then assembled in the same way as the upper bladeless fan (2) and the lower bladeless fan (3) are assembled.

Form 2 is a bladeless fan attached or fused to a duct. As shown in fig. 9, i.e. the tool of the bladeless fan (19) having the same characteristics as the bladeless fan from assembly 1 has been assembled. This may be attached to the hollow tube (1) or for some path to the hollow tube (1), or connected with both sides of the bladeless fan in the figure. The hollow tube (18) has a base. Form 2 is suitable for installation without a separator tube (4). It can keep the fluid velocity in the pipe constant or close. The higher pressure is transmitted at the fluid source. At the starting pressure and a lower pressure in the end of the pipe there will be a high pressure. It also saves more energy.

Form 3 forms the two-layer hollow tube into a single tube. Which looks the same as in fig. 9. Except that the bladeless fan and the mould of the hollow tube are realized together as a long duct with the same process.

In addition to the three forms described above, they can also be applied to a single hollow tube.

Form 4 is a single hollow tube attached to a bladeless fan with the process described above, i.e. it has an outer layer fluid inlet (8) and an inner layer fluid release (9), where the fluid from the inner layer fluid release (9) flows through the single hollow tube instead of the inner layers of the two hollow tubes. And the outer fluid inlet (8) will not receive fluid from the outer layers of two hollow tubes, but will receive fluid from a separate tube that is not a single hollow tube. Fluid from the bladeless fan will enter the fluid release point in the single hollow tube via the fluid inlet. Thus, the fluid inside the single hollow tube moves forward. This results in a pressure drop there. When the density is lower, the fluid flow from the high pressure zone is displaced. Fluid dynamics occur at a constant velocity or close to a single hollow tube.

FIG. 10 is a schematic block diagram illustrating an embodiment of a fluid movement process for an overall system, comprising:

fluid flows from a fluid source (100) through the conduit (101), with the line images in the figures representing the entire conduit. As the fluid enters the tube (101), the fluid will have a constant velocity or a velocity close to that from the fluid source (100). As the fluid passes through the bladeless fan mounting point (201), the bladeless fan will operate as the fluid density changes. The fluid passing through (201) will flow along the duct to the point where the bladeless fan is mounted (202) and pass to a separation duct which moves the fluid in two directions: bladeless fan mounting point (203) and termination point (304) which causes the area near the bladeless fan (202) to change density. This causes the bladeless fan (202) to discharge additional fluid to accelerate the flow of fluid from the blocked tube to maintain the velocity of the two separate tubes constant or close. Thus, the conduit that divides into the endpoints (304) has a constant velocity or a velocity that is close to that from the fluid source (100). Fluid flowing through the duct to the bladeless fan mounting point (203) will flow further along the duct (203). The fluid in the duct will have a constant or near velocity and flow to the bladeless fan mounting point (204). The fluid flows through the pipeline to the separator 2. There are endpoints (301) that are separated from the bottom of the graph. The fluid divided into endpoints (301) will have a constant or close velocity. The bladeless fans (201), (202), (203) and (204) keep the speed of the fluid in the pipeline constant or close. Another way is for the fluid to flow into the separator tube and to the bladeless fan mounting point (205), and as the fluid passes (205) to the separator tube, it forms a bi-directional junction. There is an end point (303) and a bladeless fan mounting point (206). The separator tube traveling to endpoint (303) will have a constant velocity throughout the conduit. Even if the angle of the tube splits again. Because the bladeless fan mounting point (205) will provide additional fluid and flow before the mounting point more quickly distributes the density constant. The separator tube flowing to the bladeless fan mounting point (206) will have a constant or close velocity. Fluid flows from the bladeless fan mounting point (205) to the bladeless fan mounting point (206), and when the fluid is delivered (206) from the fluid source (100) to the destination (302) at a constant or near speed.

In the case of form 4, the tube is a single hollow tube. In the case of a fluid source (100), comprising:

case 1: the tube (101) is a single hollow tube. The fluid source (100) is split into at least two sources such that fluid flows to the duct (101) and fluid is split to the bladeless fan at another fluid source.

Case 2: the tube (101) is a single hollow tube. The fluid source (100) has a single source with a fluid separator tube (101) and a fluid tube to the bladeless fan with fluid from the same fluid source.

A table of appropriateness of the operation mode is selected. The figure shows a bladeless fan installation.

Bladeless fan installation number Appropriate mode
201 1,2,4
202 1,4
203 1,2,4
204 1,4
205 1,4
206 1,2,4
201,202,203,204,205,206 3

In the last row of the table above, the melting or forming of form 3 can be accomplished by melting the entire tubing or by partial melting. There is more than one bladeless fan position during the melting process. Each component is then melted and assembled into the piping system. This method is less suitable for industrial scale because it requires frequent changes in the melting mode.

Form 2 has the disadvantage of fitting only certain mounting points. As the separator tube should be in the bladeless fan and be released away from the fluid within the fan. It is not suitable for use in a shunt system. There are usually always separate pipes.

Form 4 may be used with all bladeless fan mounting numbers. However, separate tubes for carrying fluids are difficult to manufacture and are not suitable for use in a limited area system, wasting resources. It is necessary for the fluid storage area to be placed in the bladeless fan, but it is not suitable.

The most suitable model is form 1, in which more than 2 bladeless fan assemblies are designed to combine an upper bladeless fan (2) and a lower bladeless fan (3). But is an assembled system or similar system that works with the same principles of the present invention. Which are counted in the field of the present invention.

The designations of "piping", "piping size", "production material" and "fluid velocity" depend on various operating conditions. The invention can be applied to all types of fluids, such as air, water, oil, solutions, etc., and therefore does not record size, material and fluid type.

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