Methanol high-pressure large-flow pressure regulating valve

Abstract

The invention relates to the technical field of high-pressure and large-flow methanol test stands, in particular to a high-pressure and large-flow methanol pressure regulating valve which comprises a valve cover, a valve body, a valve element, a valve seat, a high-pressure connector, an oil outlet connector, an oil outlet valve assembly, a pressure regulating spring, a spring seat, an adjusting screw, a mechanical manual regulating proportional valve and a connecting pipeline. The valve cover and the valve body are connected to form a methanol purging cavity and a purging passage, the valve body and the high-pressure connector are connected to form a methanol purging passage, the valve cover, the valve body, the valve element and the spring seat form a leakage purging cavity, the valve body, the valve seat and the oil outlet valve assembly form a pressure cavity, and the valve cover and the adjusting screw form a flow-controllable gas passage. The valve cover, the adjusting screw, the valve body and the oil outlet connector form a methanol purging passage, the mechanical manual adjusting proportional valve is connected with the valve cover through a pipeline to provide stable and variable-flow air or nitrogen, and the spring seat, the pressure adjusting spring, the valve element, the valve body and the valve seat are combined to form an air inlet adjusting pressure valve.

Description

Technical Field

[0001] The invention relates to the technical field of a large flow test bench for a methanol fuel injection system, in particular to a methanol high-pressure and large-flow pressure regulating valve. Background Art

[0002] At present, with the promotion and popularization of low-carbon fuels, the pressure regulating valve capacity requirements of low-carbon fuel test benches are more stringent. On the one hand, the reliability requirements of the pressure regulating valve are increasing day by day, and because low-carbon fuels require a larger flow rate under the same power requirements, the specifications of the pressure regulating valve need to meet the large flow requirements of low-carbon fuels. On the other hand, the toxic, flammable, explosive, and volatile characteristics of low-carbon fuels put forward higher requirements for the leakage of the pressure regulating valve, such as achieving zero leakage of the gap, purging and cleaning, and remote control.

[0003] Traditional pressure regulating valves are generally electromagnetically controlled, and the needle valve pairs of the flow and pressure injection systems need to take the above requirements into account at the same time, so it is impossible to achieve the best in all aspects, which also limits the reliability of the product. Summary of the invention

[0004] The present invention is intended to provide a remote controllable methanol high-pressure and large-flow pressure regulating valve, so as to provide a safe, reliable, remotely controllable, high-pressure and large-flow pressure regulating valve for a methanol test bench.

[0005] In order to achieve the above object, the basic scheme of the present invention is as follows: A controllable methanol high-pressure and high-flow pressure regulating valve, comprising: a valve cover, a valve body, a valve core, a valve seat, a high-pressure joint, an oil outlet joint, an oil outlet valve assembly, a pressure regulating spring, a spring seat, a mechanical manual proportional valve and a connecting pipeline; The mechanical manually adjustable proportional valve is connected to the air inlet passage of the valve cover through the connecting pipeline; The valve body is provided with a valve cover mounting hole and a high-pressure joint mounting hole, a part of the valve cover is inserted into the valve cover mounting hole, and a part of the high-pressure joint is assembled in the high-pressure joint mounting hole; The spring seat is mounted on the valve cover; the valve core is slidably inserted in the valve body; the pressure regulating spring is arranged between the valve core and the spring seat; the valve seat is mounted between the valve core and the high-pressure joint; the oil outlet joint is mounted on the valve body; the oil outlet valve assembly is slidably mounted between the valve body and the oil outlet joint; A purge chamber is formed between the valve body, the high-pressure connector and the valve seat, a first purge channel connected to the purge chamber is provided between the valve cover and the valve body, and a second purge channel connected to the purge chamber is provided on the high-pressure connector; the first purge channel is connected to the air inlet; A leakage purge chamber is formed between the valve body, the valve cover, the spring seat and the valve core, the leakage purge chamber is connected to the purge chamber through the air return hole provided on the valve body, and the valve body is provided with a leakage outlet hole connected to the leakage purge chamber; A pressure chamber is formed between the oil outlet valve assembly, the valve body and the valve seat, a connected air chamber and a methanol inlet hole are provided on the oil outlet valve assembly, and a methanol inlet passage connected to the pressure chamber is provided on the valve seat and the high-pressure joint; The oil outlet joint is provided with a methanol exhaust passage communicating with the air cavity; When the oil outlet valve assembly is working, the methanol air inlet hole is connected with the pressure chamber; When the oil outlet valve assembly is not working, the methanol air inlet hole is not connected to the pressure chamber.

[0006] Preferably, a third purge channel communicating with the air inlet passage is provided on the valve body and the valve cover; When the oil outlet valve assembly is working, the oil outlet valve assembly closes the third purge channel; When the oil outlet valve assembly is not working, a channel is formed between the oil outlet valve assembly and the oil outlet joint for the gas in the third purge channel to enter the air cavity and the methanol exhaust channel.

[0007] Preferably, the oil outlet valve assembly comprises: an oil outlet valve and an oil outlet valve spring; The oil outlet valve is slidably mounted in the oil outlet valve mounting cavity of the valve body; the methanol air inlet hole and the air cavity are arranged on the oil outlet valve; The oil outlet valve spring is installed in the air cavity of the oil outlet valve and is connected to the oil outlet joint.

[0008] Preferably, an adjusting screw is installed on the valve cover, and the adjusting screw extends into or does not extend into the third purge channel.

[0009] Preferably, when methanol is not introduced into the high-pressure connector, the valve core and the valve seat form a conical seal.

[0010] Preferably, the ratio of the aperture of the air inlet hole of the valve cover to the aperture of the leakage air outlet hole of the valve body is 1:2.

[0011] Preferably, the gas introduced into the mechanical manual proportional valve is air or helium.

[0012] Beneficial effects of this program: (1) In this scheme, the mechanical manual proportional valve is connected to the pressure regulating valve by a connecting pipe, so it can be adjusted away from the high-pressure area of ​​the methanol test. The pressure regulating valve is controlled by machinery and gas as a whole, and no electric sparks will be generated, further eliminating the possibility of methanol being flammable and explosive.

[0013] (2) Due to the characteristics of methanol such as high volatility, low boiling point and toxicity, the first purge channel and the third purge channel distributed on the valve cover and the valve body can not only dilute and purge the leaked methanol, but also have cooling capabilities to ensure that methanol will not leak to the outside and reduce the possibility of methanol volatilization and gasification.

[0014] (3) Add an oil outlet valve at the outlet of the pressure chamber that serves as the pressure relief outlet to keep the pressure in the pressure chamber within the required range and prevent methanol from vaporizing due to the temperature rise caused by pressure relief. Since the boiling point of methanol is 64.5°C at atmospheric pressure and 138°C at 1MPa, heat will be generated when methanol is released under high pressure, and the temperature is expected to reach 80-100°C. Adding a pressure chamber in this application can prevent methanol from vaporizing.

[0015] (4) Through the arrangement of the third purge channel, the residual methanol at the rear end of the oil outlet joint can be purged, preventing excessive methanol from remaining on the test bench.

[0016] (5) The pressure regulating screw adjusts the flow rate of the purge gas entering the third air hole, so that the pressure regulating valve can adapt to test equipment with a wider range of air intake volumes.

[0017] (6) The components of the pressure regulating valve have a higher structural strength. After assembly, it can be used to regulate the pressure of high-pressure and large-flow methanol with a flow rate of 0.2-60L / min and a pressure of 0-200MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a left side view of an embodiment of the present invention; Figure 3 It is an enlarged schematic diagram of the oil outlet valve assembly assembled in the valve body in an embodiment of the present invention; Description of reference numerals: 1-valve cover; 2-valve body; 3-valve core; 4-valve seat; 5-high pressure connector; 6-oil outlet connector; 7-oil outlet valve assembly; 8-pressure regulating spring; 9-spring seat; 10-adjusting screw; 11-mechanical manual proportional valve; 12-connecting pipeline; 111; air inlet; 112- air outlet; 113- screw; 101-first air hole; 102-third air hole; 103-air inlet; 201-first air hole; 202-fourth air hole; 203-purge chamber; 204-pressure chamber; 206-leakage purge chamber; 205-return air hole; 207-leakage outlet hole; 401- second methanol flow channel; 501 - second purge channel; 502 - first methanol flow channel; 601-Methanol exhaust duct; 71-oil outlet valve; 72-oil outlet valve spring; 711-methanol air inlet hole; 712-channel. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 , Figure 2 As shown: The embodiment of the present application provides a remote controllable methanol high-pressure and large-flow pressure regulating valve, including a valve cover 1, a valve body 2, a valve core 3, a valve seat 4, a high-pressure connector 5, an oil outlet connector 6, an oil outlet valve assembly 7, a pressure regulating spring 8, a spring seat 9, an adjusting screw 10, a mechanical manually-adjustable proportional valve 11 and a connecting pipe 12.

[0021] The mechanical manually adjustable proportional valve 11 is connected to the air inlet 103 of the valve cover 1 through the connecting pipe 12 .

[0022] The valve body 2 is provided with a valve cover mounting hole and a high-pressure connector mounting hole, a portion of the valve cover 1 is inserted into the valve cover mounting hole, and a portion of the high-pressure connector 5 is assembled in the high-pressure connector mounting hole.

[0023] The spring seat 9 is assembled on the valve cover 1 .

[0024] The valve core 3 is slidably inserted into the valve body 2 .

[0025] The pressure regulating spring 8 is arranged between the valve core 3 and the spring seat 9 .

[0026] The valve seat 4 is assembled between the valve core 3 and the high-pressure connector 5. When methanol is not introduced into the high-pressure connector 5, the valve core 3 and the valve seat 4 form a conical seal.

[0027] The oil outlet connector 6 is mounted on the valve body 2 .

[0028] The oil outlet valve assembly 7 is slidably installed between the valve body 2 and the oil outlet connector 6 .

[0029] Among them, the first air hole 101 of the valve cover 1 and the second air hole 201 of the valve body 2 constitute a first purge channel, and the first air hole 101 is connected to the air inlet 103 of the valve cover 1; a purge chamber 203 is formed between the valve body 2, the high-pressure connector 5 and the valve seat 4, and the second air hole 201 is connected to the purge chamber 203; a second purge channel 501 connected to the purge chamber 203 is provided on the high-pressure connector 5.

[0030] A leakage purge chamber 206 is formed between the valve body 2, the valve cover 1, the spring seat 9 and the valve core 3; the leakage purge chamber 206 is connected to the purge chamber 203 through the return air hole 205 provided on the valve body, and a leakage outlet hole 207 connected to the leakage purge chamber 206 is provided on the valve body 2.

[0031] The purge gas enters the purge chamber 203 through the mechanical manual proportional valve 11, the connecting pipe 12, the air inlet 103 and the first purge channel. A part of it is purged out through the second purge channel 501, and the other part enters the leakage purge chamber 206 through the return air hole 205 of the valve body 2, and the methanol leakage gas is discharged through the leakage outlet 207.

[0032] A pressure chamber 204 is formed between the valve body 2, the valve seat 4 and the oil outlet valve assembly 7. The oil outlet valve assembly 7 is provided with a connected air chamber and a methanol inlet hole 711. The valve seat 4 and the high-pressure connector 5 are provided with a methanol inlet passage connected to the pressure chamber 204; the oil outlet connector 6 is provided with a methanol exhaust passage 601 connected to the air chamber. When the oil outlet valve assembly 7 is working, the methanol inlet hole 711 is connected to the pressure chamber 204; when the oil outlet valve assembly 7 is not working, the methanol inlet hole is not connected to the pressure chamber 204. Among them, the second methanol flow passage 401 on the valve seat 4 and the first methanol flow passage 502 on the high-pressure connector 5 constitute the aforementioned methanol inlet passage. When the oil outlet valve assembly 7 is working, methanol enters the pressure chamber 204 through the methanol inlet passage, then enters the air chamber through the methanol inlet hole 711 of the oil outlet valve assembly 7, and then is discharged through the methanol exhaust passage 601 of the oil outlet connector 6.

[0033] In the embodiment of the present application, a third purge channel connected to the air inlet 103 is provided on the valve body 2 and the valve cover 1. The third purge channel is formed by connecting the third air hole 102 on the valve cover 1 and the fourth air hole 202 on the valve body 2.

[0034] Reference Figure 3 The oil outlet valve assembly 7 in the embodiment of the present application specifically includes: an oil outlet valve 71 and an oil outlet valve spring 72; the oil outlet valve 71 is slidably mounted in the oil outlet valve mounting cavity of the valve body 2; the oil outlet valve 71 is provided with the methanol inlet hole 711 and the air cavity; the oil outlet valve spring 72 is mounted in the air cavity of the oil outlet valve 711 and connected to the oil outlet connector 6. There are four methanol inlet holes 711, which perform secondary pressure reduction on the methanol entering the pressure chamber 204.

[0035] The valve cover 1 cooperates with the adjusting screw 10 to control the gas flow in the third air hole 102. According to the size of the intake flow in front of the mechanical manual proportional valve 11, the adjusting screw 10 in this embodiment can match the purge gas with a flow rate of 0.6-3m³ / h. The adjusting screw 10 is rotated to different positions extending into the third air hole 102. When the adjusting screw 10 is not inserted into or partially inserted into the third air hole 102, part of the gas in the intake passage 103 enters the passage 712 formed between the oil outlet valve 71 and the oil outlet connector 6 through the third purge passage, and then enters the methanol exhaust passage 601 to purge the subsequent pipeline.

[0036] The mechanical manual proportional valve 11 is connected to the air inlet of the valve cover 1 by a connecting pipe 12, and provides stable and variable-flow air or nitrogen to the valve cover 1 by adjusting the screw 113. The principle of the mechanical manual proportional valve 11 is: a gas with a certain flow rate and pressure is fixedly introduced through its air inlet 111, and the opening size is adjusted by rotating the screw 113 to control the gas flow entering the connecting pipe 12, and the excess gas is discharged from the air outlet 112.

[0037] The ratio of the diameter of the air inlet hole of the valve cover 1 to the diameter of the leakage air outlet hole 207 of the valve body 2 is 1:2, ensuring that the inside of the leakage purge chamber 206 is close to the atmosphere.

[0038] The specific implementation process of the above-mentioned controllable methanol high-pressure and large-flow pressure regulating valve is as follows: during operation, the adjusting screw 10 is adjusted to a suitable position according to the air intake capacity, and the intake air is passed into the air inlet 111 of the mechanical manual proportional valve 11. The air intake amount of the connecting pipeline 12 entering the valve cover 1 is controlled by adjusting the screw 113. The gas entering the valve cover 1 is divided into two parts. One part is connected with the second air hole 201 of the valve body 2 through the first air hole 101 of the valve cover 1, enters the purge chamber 203, and then enters the leakage purge chamber 206 through the return air hole 205 of the valve body 2, and flows out through the leakage outlet 207 to form a methanol leakage purge circuit, and at the same time has the function of cooling the valve seat 4 (here the temperature of the valve seat 4 rises due to the pressure loss of high-pressure methanol); the other part of the gas produces downward pressure on the spring seat 9, and transmits pressure to the valve core 3 through the pressure regulating spring 8 to control the opening pressure at the valve seat 4. When the gas flows out, if the oil outlet valve assembly 7 is not lifted, part of the gas enters the methanol exhaust passage 601 of the oil outlet connector 6 through the third air hole 102 of the valve cover 1 and the fourth air hole 202 of the valve body 2 to purge the pipeline behind.

[0039] Before and after the test bench works, the oil outlet valve 71 is not lifted, and the methanol behind the oil outlet connector 6 can be purged by introducing purge gas. During the working process, the oil outlet valve 71 is lifted, the passage is closed, and only methanol flows.

[0040] If there is a sudden pressure rise caused by the sudden gasification of methanol in the air cavity formed by the oil outlet valve 71 and the oil outlet connector 6, the oil outlet valve 7 will be seated. The methanol gas can be reversed from the third purge channel to the valve cover 1 and discharged from behind the adjusting screw 10, thereby alleviating the problem of sudden pressure rise.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A methanol high-pressure and high-flow pressure regulating valve, characterized in that: include: Valve cover (1), valve body (2), valve core (3), valve seat (4), high pressure connector (5), oil outlet connector (6), oil outlet valve assembly (7), pressure regulating spring (8), spring seat (9), mechanical manual proportional valve (11) and connecting pipeline (12); The mechanical manually adjustable proportional valve (11) is connected to the air inlet (103) of the valve cover (1) via the connecting pipeline (12); The valve body (2) is provided with a valve cover mounting hole and a high-pressure connector mounting hole, a portion of the valve cover (1) is inserted into the valve cover mounting hole, and a portion of the high-pressure connector (5) is assembled in the high-pressure connector mounting hole; The spring seat (9) is mounted on the valve cover (1); the valve core (3) is slidably inserted into the valve body (2); the pressure regulating spring (8) is arranged between the valve core (3) and the spring seat (9); the valve seat (4) is mounted between the valve core (3) and the high-pressure connector (5); the oil outlet connector (5) is mounted on the valve body (2); the oil outlet valve assembly (7) is slidably mounted between the valve body (2) and the oil outlet connector (6); A purge chamber (203) is formed between the valve body (2), the high-pressure connector (5) and the valve seat (4); a first purge channel connected to the purge chamber (203) is provided between the valve cover (1) and the valve body (2); a second purge channel (501) connected to the purge chamber (203) is provided on the high-pressure connector (5); the first purge channel (501) is connected to the air inlet (103); A leakage purge chamber (206) is formed between the valve body (2), the valve cover (1), the spring seat (9) and the valve core (3); the leakage purge chamber (206) is connected to the purge chamber (203) via an air return hole (205) provided on the valve body (2); and a leakage outlet hole (207) communicating with the leakage purge chamber (206) is provided on the valve body (2); A pressure chamber (204) is formed between the oil outlet valve assembly (7), the valve body (2) and the valve seat (4); a connected air chamber and a methanol air inlet hole (711) are provided on the oil outlet valve assembly (7); and a methanol air inlet passage connected to the pressure chamber (204) is provided on the valve seat (4) and the high-pressure connector (6); The oil outlet joint (6) is provided with a methanol exhaust passage (601) communicating with the gas cavity; When the oil outlet valve assembly (7) is in operation, the methanol air inlet hole (711) is in communication with the pressure chamber (204); When the oil outlet valve assembly (7) is not in operation, the methanol air inlet hole (711) is not in communication with the pressure chamber (204).

2. The methanol high-pressure and high-flow pressure regulating valve according to claim 1, characterized in that: The valve body (2) and the valve cover (1) are provided with a third purge channel connected to the air inlet channel; When the oil outlet valve assembly (7) is in operation, the oil outlet valve assembly (7) closes the third purge passage; When the oil outlet valve assembly (7) is not in operation, a channel (712) is formed between the oil outlet valve assembly (7) and the oil outlet connector (6) for the gas in the third purge channel to enter the gas cavity and the methanol exhaust channel (601).

3. The methanol high-pressure and high-flow pressure regulating valve according to claim 2, characterized in that: The oil outlet valve assembly (7) comprises: an oil outlet valve (71) and an oil outlet valve spring (72); The oil outlet valve (71) is slidably mounted in the oil outlet valve mounting cavity of the valve body (2); the oil outlet valve (71) is provided with the methanol air inlet hole (711) and the air cavity; The oil outlet valve spring (72) is installed in the air cavity of the oil outlet valve (71) and is connected to the oil outlet joint (6).

4. The methanol high-pressure and high-flow pressure regulating valve according to claim 2, characterized in that: An adjusting screw (10) is mounted on the valve cover (1), and the adjusting screw (10) extends into or does not extend into the third purge channel.

5. The methanol high-pressure and high-flow pressure regulating valve according to claim 1, characterized in that: When methanol is not introduced into the high-pressure connector (5), the valve core (3) and the valve seat (4) form a conical surface seal.

6. The methanol high-pressure and high-flow pressure regulating valve according to claim 1, characterized in that: The ratio of the aperture of the air inlet hole of the valve cover (1) to the aperture of the leakage air outlet hole (207) of the valve body (2) is 1:

2.

7. The methanol high-pressure and high-flow pressure regulating valve according to claim 1, characterized in that: The gas introduced into the mechanical manually adjustable proportional valve (11) is air or helium.

8. The methanol high-pressure and high-flow pressure regulating valve according to claim 1, characterized in that: The controllable methanol high-pressure and high-flow pressure regulating valve is used for regulating the pressure of high-pressure and high-flow methanol with a flow rate of 0.2-60L / min and a pressure of 0-200MPa.

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