A fuel flow regulating valve suitable for high temperature testing of aviation fuel

Abstract

The utility model discloses a fuel flow regulating valve suitable for high temperature test of aviation fuel, comprising a valve body, a cavity is arranged in the valve body, a piston is arranged in the cavity which is in close contact with the piston and can slide in the cavity, a fluid channel is arranged in the piston, a fluid inlet and a fluid outlet are also arranged in the valve body, the fluid channel in the piston can connect the fluid inlet and the fluid outlet, and other parts of the piston except the fluid channel can block the connection between the fluid inlet and the fluid outlet; the upper cavity of the piston is a pressure storage air chamber, the lower cavity of the piston is a pressure regulating air chamber, and a gas inlet connected with the pressure regulating air chamber is also arranged in the valve body. The utility model introduces gas into the gas inlet, and uses the pressure difference between the pressure storage air chamber and the pressure regulating air chamber to push the piston, so that the fluid channel in the piston connects the fluid inlet and the fluid outlet in the valve body, so as to realize the regulation and shutoff of the fluid by the valve body, and the whole process does not need electricity, and is safer when the fluid passing through the valve body is a flammable liquid such as fuel.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel flow valves, in particular to a fuel flow regulating valve suitable for high-temperature testing of aviation fuel. Background Art

[0002] The aircraft engine fuel flow sensor is a sensor used to measure the engine fuel flow. The function of the aircraft engine fuel flow sensor is to monitor the engine fuel flow to ensure the normal operation of the engine. If the fuel flow is abnormal, the sensor will send a signal to the aircraft's electronic control system so that timely measures can be taken to avoid engine failure or accidents. When the aircraft fuel flow sensor is conducting a flow test, a flow regulating structure is required to control the fuel flow. The currently commonly used automatic flow regulating structure uses electricity for control, but fuel is a volatile, flammable and explosive liquid, which poses a safety hazard to the test. Utility Model Content

[0003] The utility model aims to provide a fuel flow regulating valve suitable for aviation fuel high temperature test, which avoids fuel safety hazards and can realize flow regulation by only adjusting input pressure.

[0004] The utility model is realized through the following technical scheme: a fuel flow regulating valve suitable for high temperature test of aviation fuel, comprising a valve body, a cavity is arranged in the valve body, a piston is arranged in the cavity, which is in close contact with the piston and can slide in the cavity, a fluid channel is arranged in the piston, a fluid inlet and a fluid outlet are also arranged in the valve body, the fluid channel in the piston can connect the fluid inlet and the fluid outlet, and the other parts of the piston except the fluid channel can block the connection between the fluid inlet and the fluid outlet; the cavity above the piston is a pressure storage air chamber, the cavity below the piston is a pressure regulating air chamber, and a gas inlet connected with the pressure regulating air chamber is also arranged in the valve body.

[0005] The working principle of the present technical solution is to introduce gas into the gas inlet and utilize the pressure difference between the pressure storage chamber and the pressure regulating chamber to push the piston, so that the fluid channel in the piston connects the fluid inlet and the fluid outlet in the valve body, thereby realizing the fluid regulation and shutoff of the entire valve body. The whole process does not require electricity and is safer when the fluid passing through the valve body is a flammable liquid such as fuel.

[0006] In order to better implement the utility model, further, the fluid inlet and the fluid outlet in the valve body are located on the left and right sides of the cavity in the valve body.

[0007] In order to better implement the utility model, further, the fluid inlet and the fluid outlet in the valve body are coaxial and symmetrically arranged with respect to the central axis of the cavity.

[0008] In order to better implement the present invention, further, the diameters of the fluid inlet and the fluid outlet are the same.

[0009] In order to better implement the utility model, further, the diameter of the fluid channel in the piston is the same as the diameter of the fluid inlet and the fluid outlet, and the fluid channel is a cylindrical channel that runs through the piston body.

[0010] In order to better realize the utility model, further, the diameter of the pressure storage chamber is smaller than the diameter of the piston, and when the piston is pressed against the pressure storage chamber, the fluid channel in the piston connects the fluid inlet with the fluid outlet.

[0011] In order to better realize the utility model, further, the air pressure in the pressure storage air chamber is not less than the standard atmospheric pressure, and when the piston is not compressed, the fluid channel in the piston cannot connect the fluid inlet and the fluid outlet.

[0012] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0013] (1) The utility model introduces gas into the gas inlet and utilizes the pressure difference between the pressure storage chamber and the pressure regulating chamber to push the piston, so that the fluid channel in the piston connects the fluid inlet and the fluid outlet in the valve body, thereby realizing fluid regulation and shutoff of the entire valve body. The entire process does not require electricity, and is safer when the fluid passing through the valve body is a flammable liquid such as fuel.

[0014] (2) The utility model has a simple structure and is easy to use. It is easy to control the flow rate and on-off of the valve body. The flow rate can be adjusted by adjusting the input pressure. Less additional equipment is required. It is easy to produce and manufacture, and is suitable for wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model from the left side.

[0018] Among them: 1 - valve body, 2 - cavity, 21 - pressure storage chamber, 22 - pressure regulating chamber, 3 - piston, 4 - fluid channel, 5 - fluid inlet, 6 - fluid outlet, 7 - gas inlet. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Embodiment 1:

[0022] The main structure and principle of this embodiment are as follows: Figure 1 , Figure 2 As shown, it includes a valve body 1, a cavity 2 is provided in the valve body 1, a piston 3 is provided in the cavity 2, which is in close contact with the piston 3 and can slide in the cavity 2, a fluid channel 4 is provided in the piston 3, and a fluid inlet 5 and a fluid outlet 6 are also provided in the valve body 1. The fluid channel 4 in the piston 3 can connect the fluid inlet 5 with the fluid outlet 6, and the other parts of the piston 3 except the fluid channel 4 can block the connection between the fluid inlet 5 and the fluid outlet 6; the cavity 2 above the piston 3 is a pressure storage chamber 21, and the cavity 2 below the piston 3 is a pressure regulating chamber 22. The valve body 1 is also provided with a gas inlet 7 connected with the pressure regulating chamber 22.

[0023] Specific implementation method Figure 2As shown, the pressure storage chamber 21 is a sealed air chamber composed of a piston and the upper wall 2 in the valve body, which seals a certain amount of air to form an air spring. When the pressure regulating chamber 22 does not input gas through the gas inlet 7, the air pressure in the pressure storage chamber 21 is sufficient to make the piston 3 in a position to block the fluid from passing through the valve body 1. When the pressure regulating chamber 22 inputs gas through the gas inlet, as the input gas pressure increases, the pressure causes the piston 3 to move along the cavity 2 toward the pressure storage chamber 21, and the fluid channel 4 in the piston 3 gradually connects the fluid inlet 5 and the fluid outlet 6 in the valve body 1, and as the piston 3 moves, the fluid channel 4 in the piston 3 gradually becomes larger, and the fluid flow rate also increases, until the flow channel 4 of the piston 3 is completely exposed, at which time the flow rate reaches the maximum, and the pressure in the pressure storage chamber 21 increases. When the input gas pressure of the pressure-regulating air chamber 22 gradually decreases, the gas in the pressure storage air chamber 21 pushes the piston 3 to gradually move from the cavity in the valve body 3 toward the pressure-regulating air chamber 22, and the fluid channel 4 in the piston 3 gradually becomes smaller, and the fluid flow rate also gradually decreases until the flow channel 4 of the piston 3 is completely closed. At this time, the flow rate is zero, and the pressure in the pressure storage air chamber 21 is restored.

[0024] Embodiment 2:

[0025] Based on the above embodiment, this embodiment further defines the positional relationship between the fluid inlet 5 and the fluid outlet 6 in the valve body 1, such as Figure 1 As shown, the fluid inlet 5 and the fluid outlet 6 in the valve body 1 are located on the left and right sides of the cavity 2 in the valve body 1. The positional relationship of the fluid inlet 5 and the fluid outlet 6 in the valve body 1 is set in this way, which makes the valve body 1 simpler in structure on the one hand and easier to control on the other hand. The other parts of this embodiment are the same as the above embodiment and will not be repeated here.

[0026] Embodiment 3:

[0027] Based on the above embodiment, this embodiment further defines the positional relationship between the body inlet 5 and the fluid outlet 6 in the valve body 1, such as Figure 1 As shown, the fluid inlet 5 and the fluid outlet 6 in the valve body 1 are coaxial and symmetrically arranged with respect to the central axis of the cavity 2. Such an arrangement can further simplify the structure of the valve body 1, facilitate manufacturing, and make it easier to control the fluid flow rate. The other parts of this embodiment are the same as those of the above embodiment and will not be described in detail here.

[0028] Embodiment 4:

[0029] Based on the above embodiment, this embodiment further defines the size relationship between the fluid inlet 5 and the fluid outlet 6, such as Figure 1As shown, the diameters of the fluid inlet 5 and the fluid outlet 6 are the same. Such a configuration not only simplifies the structure of the valve body 1, making it easier to manufacture and control, but also simplifies the structure of the piston 3, which is preferred. The other parts of this embodiment are the same as those of the above embodiment, and will not be repeated here.

[0030] Embodiment 5:

[0031] Based on the above embodiment, this embodiment further defines the shape and size of the fluid channel 4 in the piston 3, such as Figure 1 As shown, the diameter of the fluid channel 4 in the piston 3 is the same as the diameter of the fluid inlet 5 and the fluid outlet 6, and the fluid channel 4 is a cylindrical channel that runs through the body of the piston 3. The structure of the fluid channel 4 in the piston 3 is set in this way to simplify the structure of the piston 3, making it easier to control the flow rate and also convenient for processing. The other parts of this embodiment are the same as the above embodiment and will not be repeated here.

[0032] Embodiment 6:

[0033] On the basis of the above embodiment, this embodiment further defines the diameter of the pressure storage chamber 21, and the diameter of the pressure storage chamber 21 is smaller than the diameter of the piston 3. When the piston 3 is pressed against the pressure storage chamber 2, the fluid channel 4 in the piston 3 connects the fluid inlet 5 with the fluid outlet 6. The diameter of the pressure storage chamber 21 is smaller than the diameter of the piston 3. This arrangement can prevent the piston 3 from entering the pressure storage chamber 21 and reduce the connection area of ​​the fluid channel 4. This ensures that even if the pressure of the pressure regulating chamber 22 is too high, the flow rate of the valve body 2 will not decrease. The other parts of this embodiment are the same as the above embodiment and will not be repeated here.

[0034] Embodiment 7:

[0035] On the basis of the above embodiment, this embodiment further limits the air pressure of the pressure storage chamber 21, and the air pressure in the pressure storage chamber 21 is not less than the standard atmospheric pressure. When the piston 3 is not compressed, the fluid channel 4 in the piston 3 cannot connect the fluid inlet 5 with the fluid outlet 6. In order to ensure the stability of the movement of the piston 3 and thus the stability of the flow control, the air pressure in the pressure storage chamber 21 is limited to not less than the standard atmospheric pressure, so that the valve body 1 can be in a closed state when the gas is not introduced into the pressure regulating chamber 22. The other parts of this embodiment are the same as the above embodiment and will not be repeated here.

[0036] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fuel flow control valve suitable for high temperature test of aviation fuel, characterized in that: The invention comprises a valve body (1), wherein a cavity (2) is arranged in the valve body (1), wherein a piston (3) is arranged in the cavity (2) and is in close contact with the cavity (2) and is capable of sliding in the cavity (2), wherein a fluid passage (4) is arranged in the piston (3), wherein a fluid inlet (5) and a fluid outlet (6) are also arranged in the valve body (1), wherein the fluid passage (4) in the piston (3) is capable of connecting the fluid inlet (5) and the fluid outlet (6), and wherein the other parts of the piston (3) except the fluid passage (4) are capable of blocking the connection between the fluid inlet (5) and the fluid outlet (6); wherein the cavity (2) above the piston (3) is a pressure storage chamber (21), wherein the cavity (2) below the piston (3) is a pressure regulating chamber (22), and wherein a gas inlet (7) connected to the pressure regulating chamber (22) is also arranged in the valve body (1).

2. A fuel flow control valve suitable for aviation fuel high temperature test according to claim 1, characterized in that: The fluid inlet (5) and the fluid outlet (6) in the valve body (1) are located on the left and right sides of the cavity (2) in the valve body (1).

3. A fuel flow control valve suitable for aviation fuel high temperature test according to claim 2, characterized in that: The fluid inlet (5) and the fluid outlet (6) in the valve body (1) are coaxial and symmetrically arranged with respect to the central axis of the cavity (2).

4. A fuel flow control valve suitable for high temperature test of aviation fuel according to claim 3, characterized in that: The diameters of the fluid inlet (5) and the fluid outlet (6) are the same.

5. A fuel flow control valve suitable for aviation fuel high temperature test according to claim 4, characterized in that: The diameter of the fluid channel (4) in the piston (3) is the same as the diameters of the fluid inlet (5) and the fluid outlet (6), and the fluid channel (4) is a cylindrical channel that runs through the body of the piston (3).

6. A fuel flow control valve suitable for aviation fuel high temperature test according to claim 1 or 2, characterized in that: The diameter of the pressure storage chamber (21) is smaller than the diameter of the piston (3). When the piston (3) is pressed against the pressure storage chamber, the fluid channel (4) in the piston (3) enables the fluid inlet (5) to communicate with the fluid outlet (6).

7. A fuel flow control valve suitable for aviation fuel high temperature test according to claim 1 or 2, characterized in that: The air pressure in the pressure storage chamber (21) is not less than the standard atmospheric pressure, and when the piston (3) is not compressed, the fluid channel (4) in the piston (3) cannot connect the fluid inlet (5) with the fluid outlet (6).

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