Combination valve for 35MPa locomotive

Abstract

The invention belongs to the technical field of valves, and particularly relates to a combination valve for a 35MPa locomotive. Comprising a shell, the shell comprises a shell upper portion and a shell lower portion, the shell upper portion is provided with an outlet adapter and a manual stop valve, the shell upper portion is provided with a second-stage pressure reducing device, and the shell lower portion is provided with an overpressure release valve, a first-stage pressure reducing device, an overtemperature release device, a first plug and a one-way inflation valve. And the lower end of the lower part of the shell is a gas cylinder butting port. The gas cylinder pressure relief device has the beneficial effects that the overpressure relief function is integrated, when the pressure exceeds a certain value, the relief device of the first-stage pressure relief valve can be automatically opened, and it is ensured that the pressure of a gas cylinder does not exceed the set value; an overtemperature relief device with a glass bead structure is arranged inside, so that when a product and the gas cylinder are in a high-temperature environment, combustible gas inside the gas cylinder is automatically released, and explosion is avoided; two high-pressure ends are reserved, and a pressure gauge and a sensor can be mounted, so that the pressure in the gas cylinder can be observed conveniently.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a combination valve for 35MPa locomotives. Background Art

[0002] At present, there are two types of locomotive valves used in locomotives, motorcycles, bicycles and mobile power supplies in the field of hydrogen energy. One is to realize the function through the existing drone valves, but the use of drone valves will increase the cost; the other is to use separate stop valves, one-way valves, and pressure reducing valves to achieve the function through pipeline connections. The use of valves with independent functions will take up a large space, and the fluctuation range of the pressure reducing valve outlet pressure cannot meet the requirements of the downstream fuel cell stack. Summary of the invention

[0003] The purpose of the present invention is to provide a 35MPa locomotive combination valve, which is suitable for locomotives, motorcycles, bicycles and mobile power supplies in the field of hydrogen energy. It can be directly connected to a hydrogen storage cylinder and can reduce the 35MPa hydrogen pressure inside the hydrogen storage cylinder to 50±10KPa to provide hydrogen to the downstream hydrogen fuel cell stack.

[0004] The technical solution of the present invention is as follows: a combination valve for 35MPa locomotives, comprising a shell, the shell comprising an upper shell part and a lower shell part, the upper shell part is respectively provided with an outlet adapter and a manual stop valve, the upper shell part is provided with a secondary pressure reducing device, the lower shell part is provided with an overpressure relief valve, a primary pressure reducing device, an over-temperature relief device, a first plug and a one-way inflation valve, and the lower end of the lower shell part is a gas cylinder docking port.

[0005] Preferably, a plurality of cavities are formed in the upper portion and the lower portion of the shell.

[0006] Preferably, an over-temperature relief device is provided in a cavity at the lower part of the shell, and the over-temperature relief device includes a plunger, a glass bead and a cap. The cap is connected to the port of the cavity, and a blind hole is opened inside the cap. The plunger is a columnar structure with two sections of different diameters, and the end with a smaller diameter fits tightly with the cavity, and the end with a larger diameter of the plunger has a blind hole inside. A glass bead is arranged between the blind hole of the cap and the blind hole of the plunger.

[0007] Preferably, a first-level pressure reducing device is arranged in a cavity in the lower part of the shell, and the first-level pressure reducing device includes a first-level plug, a first-level valve stem and a first-level spring. The first-level plug is connected to the end of the cavity, and a first-level valve stem is arranged in the cavity in the lower part of the shell below the first-level plug. A through hole is opened in the first-level valve stem, and the first-level valve stem has a head and a rod-shaped portion. The rod-shaped portion of the first-level valve stem is covered with a first-level spring.

[0008] Preferably, an overpressure relief valve is provided in a cavity at the lower part of the housing. The overpressure relief valve includes a relief valve core, a relief spring and a relief housing. The relief housing is connected to the cavity. A blind hole is formed inside the relief housing. The relief valve core is sleeved in the blind hole. A blind hole is formed in the relief valve core. The relief spring is installed between the blind hole of the relief valve core and the blind hole of the relief housing.

[0009] Preferably, a blind hole is formed at the top of the housing, and an ED plug is connected inside the blind hole.

[0010] Preferably, a secondary pressure reducing device is provided in a cavity at the upper part of the housing. The secondary pressure reducing device includes a secondary spring, a secondary end cap, a secondary valve seat and a secondary valve rod. Among them, the secondary valve seat is placed in the cavity. The middle of the secondary valve seat is a hollow cylindrical part. The secondary spring is sleeved outside the cylindrical part. The secondary valve rod is inserted into the cylindrical part of the secondary valve seat. The secondary valve rod has a head and a rod-shaped part. Its rod-shaped part is inserted into the cylindrical part of the secondary valve seat. The secondary end cap is sleeved outside the rod-shaped part of the secondary valve rod. The secondary end cap is connected to the cavity. Axial and perpendicular channels are respectively formed in the middle of the rod-shaped part of the secondary valve rod, and the axial channel communicates with the perpendicular channel.

[0011] Preferably, a one-way inflation valve is provided in a cavity at the lower part of the housing. The one-way inflation valve includes a one-way valve adapter, a spring nut, a one-way valve spring, a one-way valve core, a second filter, an outer sleeve nut and a ball head plug. Among them, the spring nut is connected in the cavity. A through hole is formed in the middle of the spring nut. One end of it is connected with an end cap. The head of the one-way valve adapter is threadedly connected to the cavity. A cavity is formed in the head of the one-way valve adapter. A columnar one-way valve core is arranged in the cavity. A blind hole is formed on one side of the one-way valve core close to the end cap of the spring nut. The one-way valve spring is arranged in the blind hole. The one-way valve adapter has a head, a convex part and an interface end. A cavity is formed inside the interface end of the one-way valve adapter. The second filter is installed in the cavity. The outside of the interface end of the one-way valve adapter is sleeved inside the outer sleeve nut. A through hole is formed in the middle of the outer sleeve nut. A ball head plug is sleeved in the through hole. One end of the ball head plug is tightly attached to the cavity opening of the interface end of the one-way valve adapter. One end of the ball head plug extends out of the through hole of the outer sleeve nut, and the head of the ball head plug is clamped between the outer sleeve nut and the interface end of the one-way valve adapter.

[0012] Preferably, a through hole is formed in the gas cylinder connection port on the housing, and a first filter is installed at the port of the gas cylinder connection port.

[0013] Preferably, a manual stop valve is provided in a cavity at the upper part of the housing. The manual stop valve includes a stop valve nut, a stop valve stem, a stop bolt and a stop valve handle. Among them, the stop valve nut extends into the cavity and is connected therein. The stop valve stem is sleeved in the middle of the stop valve nut. The head of the stop valve stem is closely attached to the inner wall of the cavity. The end of the stop valve stem is externally sleeved with a stop valve handle. A through hole perpendicular to the axial direction is opened at the end of the stop valve stem. A stop bolt is installed in the through hole, and the stop bolt simultaneously passes through the side wall surface of the stop valve handle sleeved at the end of the stop valve stem.

[0014] The beneficial effects of the present invention are as follows: It integrates an overpressure relief function. When the pressure exceeds a certain value, the relief device of the first-stage pressure reducing valve will automatically open to ensure that the gas cylinder pressure does not exceed the set value; a glass bead structure over-temperature relief device is adopted inside. When the product and the gas cylinder are in a high-temperature environment, the combustible gas inside the gas cylinder is automatically released to avoid explosion; there are 2 high-pressure ends where a pressure gauge and a sensor can be installed to facilitate observing the pressure inside the gas cylinder; the inflation port includes a check valve function, and the outlet thread is a conventional NPT1 / 4 internal thread, and different adapters can be customized according to requirements. The internal parts of the present invention have a simple structure and are easy to produce, which can effectively reduce costs. The manual stop valve has a simple function and structure, is applicable to pressures below 5 Mpa, can better save costs, and is more convenient to install. Brief Description of the Drawings

[0015] Figure 1 The first perspective schematic diagram of a 35 MPa locomotive combination valve provided by the present invention; Figure 2 The second perspective schematic diagram of a 35 MPa locomotive combination valve provided by the present invention; Figure 3 The first perspective sectional view of a 35 MPa locomotive combination valve provided by the present invention; Figure 4 The second perspective sectional view of a 35 MPa locomotive combination valve provided by the present invention; Figure 5 The third perspective sectional view of a 35 MPa locomotive combination valve provided by the present invention.

[0016] In the figure: 1 housing, 2 first O-ring, 3 first snap ring, 4 plunger, 5 glass bead, 6 cap, 7 first plug, 8 second O-ring, 9 first valve stem, 10 second snap ring, 11 third O-ring, 12 first spring, 13 third snap ring, 14 fourth O-ring, 15 bleed valve core, 16 bleed spring, 17 bleed housing, 18 first filter, 19 fifth O-ring, 20 first plug, 21 ED plug, 22 seventh O-ring, 23 eighth O-ring, 24 fourth snap ring, 25 second spring, 26 second end cap, 27 second valve seat, 28 second valve stem, 29 ninth O-ring, 30 fifth snap ring, 31 tenth O-ring, 32 sixth snap ring, 33 check valve adapter, 34 spring nut, 35 check valve spring, 36 check valve core, 37 second filter, 38 outer sleeve nut, 39 ball head plug, 40 outlet adapter, 41 eleventh O-ring, 42 seventh snap ring, 43 globe valve nut, 44 globe valve stem, 45 globe valve bolt, 46 globe valve handle, 102 secondary pressure reducing device, 103 one-way inflation valve, 104 overpressure relief valve, 105 manual shut-off valve, 106 primary pressure reducing device, 107 gas cylinder docking port, 108 overtemperature relief device, 109 second plug. Detailed implementation manner

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, in the description of the present invention, in addition, "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "coupled" 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 a connection through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The meaning of "a plurality" is two or more, unless otherwise clearly and specifically defined.

[0020] As Figure 1 and 2 shown, a combined valve for a 35 MPa locomotive includes a housing 1, and the housing 1 includes two parts: an upper housing 110 and a lower housing 111. Among them, the upper housing 110 presents a "convex" shape. On both sides of the convex shape of the upper housing 110, an outlet adapter 40 and a manual stop valve 105 are respectively arranged. At the top of the convex shape of the upper housing 110, a secondary pressure reducing device 102 is arranged. The lower housing 111 has a square structure. On one side of it, an overpressure relief valve 104 is arranged. On one side adjacent to the side where the overpressure relief valve 104 is arranged, a primary pressure reducing device 106, an over-temperature relief device 108 and a first plug 20 are arranged. Among them, the primary pressure reducing device 106 and the over-temperature relief device 108 are located on both sides of the second plug 109. On the side of the lower housing 111 opposite to the side where the primary pressure reducing device 106, the over-temperature relief device 108 and the second plug 109 are arranged, a one-way inflation valve 103 is arranged. The lower end of the lower housing 111 is a gas cylinder docking port 107.

[0021] As Figure 3 shown, a plurality of cylindrical cavities are formed in the lower housing 111.

[0022] An over-temperature relief device 108 is arranged in one of the cavities. The over-temperature relief device 108 includes a first O-ring 2, a first snap ring 3, a plunger 4, a glass bead 5 and a cap. The cap 6 is connected to the port of the cavity through a threaded structure. A blind hole is formed inside the cap 6. The plunger 4 is a columnar body structure with two different diameters. The end with a smaller diameter thereof is in close fit with the cavity. A groove is formed thereon, and the first O-ring 2 and the first snap ring 3 are arranged in the groove. A blind hole is formed inside the end with a larger diameter of the plunger 4. A long strip-shaped glass bead 5 is arranged between the blind hole of the cap 6 and the blind hole of the plunger 4. Both ends of the glass bead 5 respectively extend into the blind holes of the cap 6 and the plunger 4.

[0023] A primary pressure reducing device 106 is disposed within a cavity of the lower part 111 of the housing. The primary pressure reducing device 106 includes a primary plug 7, a second O-ring 8, a primary valve stem 9, a second snap ring 10, an O-ring 11, a primary spring 12, a third snap ring 13, and a fourth O-ring 14. Among them, the primary plug 7 is threadedly connected to the end of the cavity. A groove is formed in the primary plug 7, and a second O-ring 8 is disposed within the groove between the primary plug 7 and the cavity. The second O-ring 8 is located between the primary plug 7 and the cavity to play a sealing role. Below the primary plug 7, a primary valve stem 9 is disposed within the cavity of the lower part 111 of the housing. A through hole is formed within the primary valve stem 9. The primary valve stem 9 is in a screw-like structure having a head and a rod-shaped portion. A groove is formed on the side end of the head of the primary valve stem 9, and a second snap ring 10 and an O-ring 11 are disposed within the groove. The rod-shaped portion of the primary valve stem 9 is externally sleeved with a primary spring 12. Both ends of the primary spring 12 are respectively restricted by the head of the primary valve stem 9 and the cavity wall of the cavity. The end of the rod-shaped portion of the primary valve stem 9 is in close contact with the cavity, and a groove is formed thereon. A third snap ring 13 and a fourth O-ring 14 are disposed within the groove.

[0024] An overpressure relief valve 104 is disposed within a cavity of the lower part 111 of the housing. The overpressure relief valve 104 includes a relief valve core 15, a relief spring 16, and a relief housing 17. The relief housing 17 is in a bolt-like structure and is threadedly connected to the cavity. A blind hole is formed within the relief housing 17, and a columnar relief valve core 15 is sleeved within the blind hole. A blind hole is formed in the relief valve core 15, and the relief spring 16 is installed between the blind hole of the relief valve core 15 and the blind hole of the relief housing 17.

[0025] A gas cylinder docking port 107 is disposed within a cavity of the lower part 111 of the housing.

[0026] A first plug 20 is disposed within a cavity of the lower part 111 of the housing, and a sealing ring is disposed between the plug and the cavity.

[0027] Among them, the cavity of the lower part 111 of the housing where the over-temperature relief device 108 is disposed is respectively communicated with the outside of the housing 1 and the cavity where the gas cylinder docking port 107 is disposed through channels; the cavity of the lower part 111 of the housing where the overpressure relief valve 104 is disposed is communicated with the cavity where the primary pressure reducing device 106 is disposed through a channel, and the cavity of the lower part 111 of the housing where the primary pressure reducing device 106 is disposed is communicated with the cavity where the gas cylinder docking port 107 is disposed through a channel; the cavity of the lower part 111 of the housing where the plug 20 is disposed is communicated with the cavity where the gas cylinder docking port 107 is disposed through a channel.

[0028] Such as Figure 4As shown, multiple cavities are formed in the upper part 110 of the housing. A secondary pressure reducing device 102 is disposed in one of the cavities. The secondary pressure reducing device 102 includes a seventh O-ring 22, an eighth O-ring 23, a fourth snap ring 24, a secondary spring 25, a secondary end cap 26, a secondary valve seat 27, a secondary valve stem 28, a ninth O-ring 29, and a fifth snap ring 30. Among them, the secondary valve seat 27 is threadedly connected to the cavity. A seventh O-ring 22 is disposed in the cavity wall surface in contact with the secondary valve seat 27. The middle of the secondary valve seat 27 is a hollow cylindrical portion. The secondary spring 25 is sleeved outside the cylindrical portion. The secondary valve stem 28 is inserted into the cylindrical portion of the secondary valve seat 27. The secondary valve stem 28 has a head and a rod-shaped portion. Its rod-shaped portion is inserted into the cylindrical portion of the secondary valve seat 27. A groove is formed on the rod-shaped portion of the secondary valve stem 28. The eighth O-ring 23 and the fourth snap ring 24 are disposed in the groove. The two ends of the secondary spring 25 respectively abut against the secondary valve seat 27 and the head of the secondary valve stem 28. The secondary end cap 26 is sleeved outside the secondary valve stem 28. The secondary end cap 26 is threadedly connected to the cavity. A groove is formed on the head of the secondary valve stem 28. The ninth O-ring 29 and the fifth snap ring 30 are disposed in the groove. A channel parallel to the axis and a channel perpendicular to the axis are respectively formed in the middle of the rod-shaped portion of the secondary valve stem 28. The axial channel and the perpendicular channel communicate with each other. The middle part of the rod-shaped portion of the secondary valve stem 28 is in close fit with the inner part of the cylindrical portion of the secondary valve seat 27. A gap exists between the head of the rod-shaped portion of the secondary valve stem 28 with the perpendicular channel and the cylindrical portion of the secondary valve seat 27.

[0029] The cavity of the housing upper part 110 where the secondary pressure reducing device 102 is disposed is also communicated with the primary pressure reducing device 106 through a channel. The gas is first reduced in pressure at the primary stage, then flows into the secondary stage for pressure reduction, and finally flows out from the outlet.

[0030] A one-way inflation valve 103 is arranged in a cavity of the lower part 111 of the housing. The one-way inflation valve 103 includes a tenth O-ring 31, a sixth snap ring 32, a one-way valve adapter 33, a spring nut 34, a one-way valve spring 35, a one-way valve spool 36, a second filter 37, an outer sleeve nut 38 and a ball head plug 39. Among them, the spring nut 34 is connected to the cavity by thread. A through hole is opened in the middle of the spring nut 34, and one end of it is connected with an end cover. The head of the one-way valve adapter 33 is connected to the cavity by thread. A groove is opened in the head of the one-way valve adapter 33, and the tenth O-ring 31 and the sixth snap ring 32 are arranged in the groove. A cavity is opened in the head of the one-way valve adapter 33, and a columnar one-way valve spool 36 is arranged in the cavity. A blind hole is opened on one side of the one-way valve spool 36 close to the end cover of the spring nut 34, and a one-way valve spring 35 is arranged in the blind hole. One end of the one-way valve spring 35 abuts against the end cover of the spring nut 34, and the other end of the one-way valve spring 35 abuts against the one-way valve spool 36. The one-way valve adapter 33 has a head, a convex part and an interface end. A cavity is opened in the interface end of the one-way valve adapter 33, and a second filter 37 is installed in the cavity. The outside of the interface end of the one-way valve adapter 33 is sleeved in the outer sleeve nut 38 by thread. A through hole is opened in the middle of the outer sleeve nut 38, and a ball head plug 39 is sleeved in the through hole. One end of the ball head plug 39 is closely attached to the cavity opening of the interface end of the one-way valve adapter 33. One end of the ball head plug 39 extends out of the through hole of the outer sleeve nut 38, and the head of the ball head plug 39 is clamped between the outer sleeve nut 38 and the interface end of the one-way valve adapter 33.

[0031] A through hole is opened in the gas cylinder docking port 107 on the housing 1. A first filter 18 is installed at the port of the gas cylinder docking port 107. A groove is opened outside the gas cylinder docking port 107, and a fifth O-ring 19 is arranged in the groove.

[0032] A blind hole is opened at the top of the housing 1, and an ED plug 21 is connected to the blind hole by thread.

[0033] A horizontal and a vertical cavity are respectively opened on one side of the housing 1 opposite to the side where the one-way inflation valve 103 is arranged. A first plug 20 is arranged in the horizontal cavity, and a second plug 109 is arranged in the vertical cavity. The vertical cavity is communicated with the horizontal cavity through a channel. The horizontal cavity is communicated with the cavity where the one-way inflation valve 103 is arranged through a channel. The through hole in the gas cylinder docking port 107 is communicated with the channel between the cavity where the first plug 20 and the one-way inflation valve 103 are arranged.

[0034] As Figure 5As shown in the figure, a manual stop valve 105 is provided in a cavity of the upper part 110 of the housing. The manual stop valve 105 includes an eleventh O-ring 41, a seventh snap ring 42, a stop valve nut 43, a stop valve stem 44, a stop bolt 45 and a stop valve handle 46. Among them, the stop valve nut 43 extends into the cavity and is threadedly connected in the cavity. The stop valve stem 44 is sleeved in the middle of the stop valve nut 43. A groove is provided at the head of the stop valve stem 44, and an eleventh O-ring 41 and a seventh snap ring 42 are arranged in the groove. The head of the stop valve stem 44 is in close contact with the inner wall of the cavity. The end of the stop valve stem 44 is externally sleeved with a stop valve handle 46. A through hole perpendicular to the axial direction is provided at the end of the stop valve stem 44, and a stop bolt 45 is installed in the through hole. The stop bolt 45 simultaneously passes through the side wall surface of the stop valve handle 46 sleeved on the end of the stop valve stem 44.

[0035] An outlet adapter 40 is installed in a cavity of the upper part 110 of the housing.

[0036] The cavities in the upper part 110 of the housing where the secondary pressure reducing device is installed are respectively communicated with the cavity where the outlet adapter 40 is installed and the cavity where the manual stop valve 105 is installed through channels.

[0037] The assembly process of the present invention is as follows: a. The first O-ring 2 and the first snap ring 3 are first installed on the plunger 4 and then pressed into the housing 1. Subsequently, the glass bead 5 is placed in, and the cap 6 is screwed on. The over-temperature relief device 108 is assembled.

[0038] b. The third snap ring 13, the fourth O-ring 14, the second snap ring 10 and the third O-ring 11 are installed on the first-stage valve stem 9. Subsequently, the first-stage spring 12 is sleeved on the first-stage valve stem 9, and they are all placed into the housing 1. Immediately afterwards, the second O-ring 8 is sleeved on the first-stage plug 7 and they are screwed into the housing 1 together. The first-stage pressure reducing device 106 is assembled.

[0039] c. The relief valve core 15 and the relief spring 16 are placed into the relief housing 17, and then screwed into the housing 1. The over-pressure relief valve 104 is assembled.

[0040] d. The seventh O-ring 22 is placed into the housing 1. Subsequently, the second-stage valve seat 27 is screwed into the housing, and the second-stage spring 25 is placed in. Then, the second-stage valve stem 28 equipped with the eighth O-ring 23, the fourth snap ring 24, the ninth O-ring 29 and the fifth snap ring 30 is placed into the housing 1. Finally, the second-stage end cap 26 is screwed onto the housing 1. The second-stage pressure reducing device 102 is assembled.

[0041] e. Install the tenth O-ring 31 and the sixth snap ring 32 on the check valve adapter 33. Then, place the check valve spool 36 and the check valve spring 35 in sequence. Next, screw the spring nut 34 into the check valve adapter 33. After that, press the filter disc 37 into the check valve adapter 33, and install the outer sleeve nut 38 and the ball head plug 39. Finally, screw the check valve adapter 33 with all the parts installed into the housing 1. The one-way inflation valve 103 is assembled.

[0042] f. Install the eleventh O-ring 41 and the seventh snap ring 42 on the globe valve stem 44. Then, assemble the globe valve nut 43 with the globe valve stem 44 and screw them together into the housing 1. Next, slip the globe valve handle 46 onto the globe valve stem 44 and fix it with the stop bolt 45. The manual globe valve 105 is assembled.

[0043] g. Install the remaining other parts on the housing 1. The first plug 20 and the second plug 109 contain O-rings, and the ED plug 21 containing an O-ring is screwed into the housing. Finally, slip the fifth O-ring 19 and the first filter disc 18 onto the housing 1. Finally, install the outlet adapter 40 (the size of the outlet adapter can be customized according to requirements).

[0044] The features of the present invention are as follows: 1. Overall scheme structure: The product needs to be used together with a gas cylinder. Gas is inflated into the gas cylinder from the check valve inlet, passing through two filter discs (10μm) to ensure its purity. Then, through the internal flow channel, it undergoes two processes of pressure reduction, making its outlet pressure at a stable value (which can be according to customer requirements). There are reserved threaded interfaces (2 SAE7 / 16 internal threads) on the product for detecting the pressure inside the gas cylinder, and a pressure gauge or a pressure sensor can be installed according to usage requirements.

[0045] 2. Using glass beads When the internal temperature reaches 110°C ± 5°C, the glass bead 5 will break, and the internal gas will squeeze the plunger 4 to the cap 6, and the gas will flow to the outside from the side breathing holes.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A combination valve for 35MPa locomotive, characterized by: It includes a shell, which includes an upper shell part and a lower shell part. The upper shell part is respectively provided with an outlet adapter and a manual stop valve, the upper shell part is provided with a secondary pressure reducing device, the lower shell part is provided with an overpressure relief valve, a primary pressure reducing device, an over-temperature relief device, a first plug and a one-way inflation valve, and the lower end of the lower shell part is a gas cylinder docking port.

2. A combination valve for 35MPa locomotives as claimed in claim 1, characterized in that: A plurality of cavities are formed on the upper part and the lower part of the shell.

3. A combination valve for 35MPa locomotives as claimed in claim 2, characterized in that: An over-temperature relief device is arranged in a cavity at the lower part of the shell, and the over-temperature relief device includes a plunger, a glass bead and a cap. The cap is connected to the port of the cavity, and a blind hole is opened inside the cap. The plunger is a columnar structure with two sections of different diameters, and the end with a smaller diameter fits tightly with the cavity, and the end with a larger diameter of the plunger has a blind hole inside. A glass bead is arranged between the blind hole of the cap and the blind hole of the plunger.

4. A combined valve for 35MPa locomotives as claimed in claim 2, characterized in that: A first-level pressure reducing device is arranged in a cavity at the lower part of the shell, and the first-level pressure reducing device includes a first-level plug, a first-level valve stem and a first-level spring. The first-level plug is connected to the end of the cavity, and a first-level valve stem is arranged in the cavity at the lower part of the shell below the first-level plug. A through hole is opened in the first-level valve stem, and the first-level valve stem has a head and a rod-shaped portion. The rod-shaped portion of the first-level valve stem is covered with a first-level spring.

5. A combined valve for 35MPa locomotives as claimed in claim 2, characterized in that: An overpressure relief valve is arranged in a cavity at the lower part of the shell, and the overpressure relief valve includes a relief valve core, a relief spring and a relief shell. The relief shell is connected to the cavity, a blind hole is opened inside the relief shell, and the relief valve core is installed in the blind hole. A blind hole is opened on the relief valve core, and the relief spring is installed between the blind hole of the relief valve core and the blind hole of the relief shell.

6. A combined valve for 35MPa locomotives as claimed in claim 2, characterized in that: A blind hole is opened on the top of the shell, and an ED plug is connected in the blind hole.

7. A combined valve for 35MPa locomotives as claimed in claim 2, characterized in that: A secondary pressure reducing device is arranged in a cavity in the upper part of the shell, and the secondary pressure reducing device comprises a secondary spring, a secondary end cover, a secondary valve seat and a secondary valve stem, wherein the secondary valve seat is in the cavity, the middle of the secondary valve seat is a hollow cylindrical part, the outer side of the cylindrical part is sleeved with a secondary spring, the cylindrical part is inserted with a secondary valve stem, the secondary valve stem has a head and a rod-shaped part, and the rod-shaped part is inserted into the cylindrical part of the secondary valve seat, the outer side of the secondary valve stem is sleeved with a secondary end cover, the secondary end cover is connected to the cavity, and the middle of the rod-shaped part of the secondary valve stem has a channel parallel and perpendicular to the axial direction, respectively, and the axial channel and the vertical channel are interconnected.

8. A combined valve for 35MPa locomotives as claimed in claim 2, characterized in that: A one-way inflation valve is arranged in a cavity at the lower part of the shell, and the one-way inflation valve comprises a one-way valve adapter, a spring nut, a one-way valve spring, a one-way valve core, a second filter, a jacket nut and a ball plug, wherein the spring nut is connected in the cavity, a through hole is opened in the middle of the spring nut, one end of which is connected to an end cover, a head of the one-way valve adapter, the head of the one-way valve adapter is connected to the cavity through a thread, the head of the one-way valve adapter is opened with a cavity, a columnar one-way valve core is arranged in the cavity, and a blind hole is opened on one side of the one-way valve core close to the end cover of the spring nut The one-way valve adapter has a hole, a one-way valve spring is arranged in the blind hole, the one-way valve adapter has a head, an outer convex part and an interface end, a cavity is opened in the interface end of the one-way valve adapter, a second filter is installed in the cavity, the outer part of the interface end of the one-way valve adapter is sleeved in the outer sleeve nut, a through hole is opened in the middle of the outer sleeve nut, a ball plug is sleeved in the through hole, one end of the ball plug is tightly fitted with the cavity opening of the interface end of the one-way valve adapter, one end of the ball plug extends out of the through hole of the outer sleeve nut, and the head of the ball plug is clamped between the outer sleeve nut and the interface end of the one-way valve adapter.

9. A combined valve for 35MPa locomotives as claimed in claim 1, characterized in that: A through hole is formed on the gas cylinder docking interface on the shell, and a first filter is installed at the port of the gas cylinder docking interface.

10. A combined valve for 35MPa locomotives as claimed in claim 2, characterized in that: A manual stop valve is arranged in a cavity at the upper part of the shell, and the manual stop valve comprises a stop valve nut, a stop valve stem, a stop moving bolt and a stop valve handle, wherein the stop valve nut extends into the cavity and is connected in the cavity, the stop valve stem is sleeved in the middle of the stop valve nut, the head of the stop valve stem is tightly fitted with the inner wall of the cavity, the end of the stop valve stem is sleeved with the stop valve handle, the end of the stop valve stem is provided with a through hole perpendicular to the axial direction, the through hole is provided with a stop moving bolt, and the stop moving bolt simultaneously passes through the side wall surface of the stop valve handle sleeved on the end of the stop valve stem.

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