Multi-element gas proportioning cabinet

Abstract

A multi-element gas proportioning cabinet is provided with at least two inlets and an outlet, the inlets are respectively connected with branch pipes, the branch pipes are connected with a main pipe, the main pipe is connected with the outlet, each branch pipe is sequentially provided with a pressure regulating valve, a gas balance valve, a one-way valve, a stop valve and a gas flow valve, and the gas balance valve is provided with a balance gas inlet; the plurality of gas balance valves are connected with a gas balance pipe; a bypass pipe is also arranged on one branch pipe and is connected with a gas balance pipe through a buffer tank; different to-be-mixed gases are introduced into the branch pipes respectively, the same pressure is set through the pressure regulating valves on the branch pipes, the adjusted gas pressure has certain deviation, then the gas pressure is automatically adjusted to be basically the same through the gas balance valves, and the mixed gas meeting the proportion requirement is formed in the main pipe by setting the flow of the gas flow valves of the branch pipes according to the mixing proportion. Compared with a traditional gas mixing device, the multi-element gas mixing device has the advantage that multi-element gas can be more efficiently and accurately mixed in proportion.

Description

Technical Field

[0001] The invention relates to the field of multi-component gas proportion mixing devices, in particular to a multi-component gas proportioning cabinet. Background Art

[0002] According to the actual needs of production or life, it is necessary to mix multiple gases in proportion before use. The so-called "multiple" refers to two or more gases. For example, MAG welding, that is, metal active gas shielded arc welding, is a mixed gas shielded welding made by adding a small amount of oxidizing gas (oxygen, carbon dioxide or a mixed gas) to argon. The commonly used gas in my country is a mixed gas of 80% argon and 20% carbon dioxide, which involves the proportion of argon and carbon dioxide.

[0003] Usually, a gas flow valve can be used to adjust the gas flow. When multiple gases are mixed, a single gas can be introduced through each branch pipeline, and each branch pipeline is connected to a gas flow valve before entering the main pipeline for mixing. The flow rate of each gas flow valve is adjusted according to the gas mixing ratio. However, the above adjustment is based on the condition that there is a stable gas pressure input at the front end of the gas flow valve. When the gas pressure input at the front end of the gas flow valve changes, the flow rate ratio of each gas flow valve will also change and need to be readjusted. The front end pressure changes passively or needs to be actively adjusted from time to time. Frequent adjustment of the gas flow valve is time-consuming and labor-intensive, which is not conducive to automatic control.

[0004] By setting a pressure regulating valve at the front end of the flow control valve, the gas pressure can be stabilized to a certain extent. However, there is a certain degree of deviation between the set value and the actual value of the pressure regulating valve. When the mixed gas requires a more precise ratio, using only a pressure regulating valve cannot meet the requirements. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a multi-gas proportioning cabinet, which solves the problem of more efficient and accurate proportional mixing of multi-gases.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A multi-element gas proportioning cabinet is provided with a cabinet body, the cabinet body is provided with at least two inlets and one outlet, the inlets are respectively connected to branch pipes, the branch pipes are sequentially provided with a pressure regulating valve, a gas balancing valve, a one-way valve, a cut-off valve, and a gas flow valve; the ends of the branch pipes are all connected to a main pipe, the main pipe is connected to the outlet, the gas balancing valve is provided with a balancing gas inlet, and the balancing gas inlets of multiple gas balancing valves are all connected to a gas balancing pipe; a bypass pipe is provided between the pressure regulating valve of one branch pipe and the gas balancing valve, and the ends of the bypass pipe are connected to the gas balancing pipe; the inner diameters of multiple branch pipes are the same.

[0008] Preferably, the gas balancing valve is provided with an air inlet and an air outlet, the air inlet and the air outlet are connected to a branch pipe, the other end of the air outlet is connected to a pressure chamber through an air flow channel, a spring is provided in the pressure chamber, the spring is connected to an opening adjustment rod, the opening adjustment rod is connected to an elastic valve plate, the circumferential edge of the elastic valve plate is fixed and closes the air flow channel; the opening adjustment rod is provided in the air flow channel and cooperates with the gap of the air flow channel, and the opening adjustment rod can close the air flow channel by the end connected to the spring; the other end of the air inlet is connected to the outer wall of the pressure chamber through a chamber, and the pressure chamber is provided with an air hole; the end of the elastic valve plate away from the opening adjustment rod is connected to the balancing gas inlet.

[0009] Preferably, a buffer tank is also provided between the bypass pipe and the gas balancing pipe, and the buffer tank is provided with a tank inlet, a tank outlet, and a balancing gas outlet, the bypass pipe is connected to the tank inlet, and the balancing gas outlet is connected to the gas balancing pipe; an inlet cut-off valve is also provided on the bypass pipe; the tank outlet is connected to the outlet cut-off valve, and the outlet cut-off valve is connected to a gas flow valve.

[0010] Preferably, a low pressure alarm is also provided between the branch pipe pressure regulating valve and the inlet.

[0011] Preferably, a gas content detection port is also provided on the main pipe.

[0012] Preferably, the cabinet is provided with two inlets, the branch pipes are provided in two numbers, one of the branch pipes is passed through with argon gas, and the other branch pipe is passed through with carbon dioxide gas, and the gas content detection port is used to detect the carbon dioxide gas content.

[0013] The present invention provides a multi-element gas proportioning cabinet. It has the following beneficial effects: By setting up a gas balancing valve, the gas pressure introduced through the gas balancing pipe of the gas balancing valve can make each gas balancing valve reach a balanced state, so that the gas pressure at the outlet of each gas balancing valve is basically the same, and then the gas flow valve of each branch pipe is adjusted according to the gas mixing ratio, so as to form a mixed gas that meets the ratio requirements in the main pipe efficiently and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the connection relationship of various components of the present invention; Figure 2 This is a schematic diagram of the structure of the gas balancing valve of the present invention; Figure 3 It is a schematic diagram of the state when gas is introduced into the balancing gas inlet of the gas balancing valve of the present invention and a diagram of the gas flow direction.

[0015] In the figure, 1-cabinet, 2-inlet, 21-branch pipe, 3-outlet, 31-main pipe, 41-pressure regulating valve, 42-gas balancing valve, 421-balancing gas inlet, 422-air inlet, 423-air outlet, 424-air flow channel, 425-pressure bearing chamber, 426-spring, 427-opening adjustment rod, 428-elastic valve plate, 429-air hole, 43-check valve, 44a-cut-off valve, 44b-inlet cut-off valve, 44c-outlet cut-off valve, 45-gas flow valve, 46-low pressure alarm, 47-gas content detection port, 5-gas balancing pipe, 6-bypass pipe, 7-buffer tank, 71-tank inlet, 72-tank outlet, 73-balancing gas outlet. Implementation

[0016] 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.

[0017] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0018] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0019] See also Figure 1The embodiment of the present invention provides a technical solution: a multi-element gas proportioning cabinet, provided with a cabinet body 1, the cabinet body is provided with at least two inlets 2 and one outlet 3, the inlets 2 are respectively connected to branch pipes 21, the branch pipes 21 are provided with pressure regulating valves 41, gas balancing valves 42, one-way valves 43, cut-off valves 44a, and gas flow valves 45 in sequence; the ends of the branch pipes 21 are all connected to the main pipes 31, the main pipes 31 are connected to the outlet 3, the gas balancing valve 42 is provided with a balancing gas inlet 421, and the balancing gas inlets 421 of the plurality of gas balancing valves 42 are all connected to the gas balancing pipe 5; a bypass pipe 6 is provided between the pressure regulating valve 41 of one branch pipe 21 and the gas balancing valve 42, and the ends of the bypass pipe 6 are connected to the gas balancing pipe 5; the inner diameters of the plurality of branch pipes 21 are the same. It should be particularly noted that the pressure regulating valve 41, the one-way valve 43, the cut-off valve 44a, and the gas flow valve 45 use the corresponding structures of the prior art.

[0020] See also Figure 2-3 In this embodiment, the gas balance valve 42 is provided with an air inlet 422 and an air outlet 423, the air inlet 422 and the air outlet 423 are connected to the branch pipe 21, and the other end of the air outlet 423 is connected to the pressure chamber 425 through the air flow channel 424, and a spring 426 is provided in the pressure chamber 425, and the spring 426 is connected to the opening adjustment rod 427, and the opening adjustment rod 427 is connected to the elastic valve plate 428, and the elastic valve plate 428 is fixed and sealed at the circumferential edge. Close the air flow channel 424; the opening adjustment rod 427 is arranged in the air flow channel 424 and is clearance-matched with the air flow channel 424, and the opening adjustment rod 427 can close the air flow channel 424 by the end connected to the spring 426; the other end of the air inlet 422 is connected to the outer wall of the pressure chamber 425 through the chamber, and the pressure chamber 425 is provided with an air hole 429; the end of the elastic valve plate 428 away from the opening adjustment rod 427 is connected to the balancing air inlet 421.

[0021] See also Figure 1 In this embodiment, a buffer tank 7 is further provided between the bypass pipe 6 and the gas balance pipe 5. The buffer tank 7 is provided with a tank inlet 71, a tank outlet 72, and a balance gas outlet 73. The bypass pipe 6 is connected to the tank inlet 71, and the balance gas outlet 73 is connected to the gas balance pipe 5. The bypass pipe 6 is further provided with an inlet cut-off valve 44b. The tank outlet 72 is connected to an outlet cut-off valve 44c, and the outlet cut-off valve 44c is connected to a gas flow valve 45. It should be particularly noted that the inlet cut-off valve 44b, the outlet cut-off valve 44c, and the flow valve 45 use corresponding structures of the prior art.

[0022] See also Figure 1In this embodiment, a low pressure alarm 46 is further provided between the branch pipe 21 pressure regulating valve 41 and the inlet 2. It should be particularly noted that the reason for providing the low pressure alarm 46 is that when the pressure of the gas introduced into the inlet 2 is too low, the gas cannot fill the pipeline, especially when the branch pipe 21 is connected to the bypass pipe 6, the pressure entering the gas balance pipe 5 is too low to push the opening adjustment rod 427 downward through the elastic valve sheet 428, resulting in the gas being unable to pass through the gas balance valve 42.

[0023] See also Figure 1 In this embodiment, the main pipe is further provided with a gas content detection port 47. It should be particularly noted that the gas content detection port 47 can be used to check and verify the gas content.

[0024] See also Figure 1 In this embodiment, two inlets 2 are provided on the cabinet 1, and two branch pipes 21 are provided, one branch pipe 21 is introduced into argon gas, and the other branch pipe 21 is introduced into carbon dioxide gas, and the gas content detection port 47 is used to detect the carbon dioxide gas content.

[0025] Working principle and use process of the present invention: A multi-element gas proportioning cabinet, when working, introduces different gases into multiple inlets 2 respectively, sets the pressure regulating valve 41 of each branch pipe 21 to the same pressure value, and the gas of each branch pipe 21 is respectively pressure-regulated by the pressure regulating valve 41 of the branch pipe 21, and the pressure value is close, but there is still a certain deviation. This is because the theoretical setting value of the pressure regulating valve 41 and the actual value cannot be accurately unified, and different degrees of wear and tear occur during use. In fact, after the pressure of each branch pipe 21 is adjusted by the pressure regulating valve 41, there is still a certain gap between each other; when passing through the gas balance valve 421, one of the branch pipes 21 enters the buffer tank 7 through the bypass pipe, and here, the buffer tank 7 plays the role of stabilizing the airflow. The gas in the buffer tank 7 enters the balancing gas inlet 421 of the gas balancing valve 42 of each branch 21 through the balancing gas outlet 73, generates pressure on the elastic valve plate 428, and pushes the opening adjustment rod 427 to move downward. The lower end of the opening adjustment rod 427 is separated from the air flow channel 424 by a distance, so that the gas at the air inlet 422 of the gas balancing valve 42 can pass through it. The gas with relatively large gas pressure in each branch pipe 21 pushes the valve plate upward from the bottom of the elastic valve plate 428, and the corresponding spring 426 is elongated longer. The lower end of the opening adjustment rod 427 is closer to the air flow channel 424, thereby reducing the amount of gas passing through the air flow channel 424, so that the elastic valve plate 428 is in a new equilibrium state, and the elastic valve plate 42 The pressure on the upper part of 8 comes from the gas balance pipe 5. The gas pressure of the balance gas inlet 421 of each gas balance valve 42 is the same. The pressure below the elastic valve plate 428 is the elastic force of the spring 426 plus the pressure of the passing air flow. When the spring 426 is slightly deformed, it has a greater impact on the opening of the opening adjustment rod 427 relative to the air flow channel 424. The opening of the opening adjustment rod 427 relative to the air flow channel 424 directly affects the pressure of the passing air flow. Moreover, after the pressure is adjusted by the pressure regulating valve 41, the pressure of each branch pipe 21 itself is not much different. Therefore, the slight deformation between the springs 426 of each gas balance valve 42 causes the elastic force change, which can be relatively ignored, so that the outlet pressure of each gas balance valve 42 is almost the same. The same; when the pressure from the gas balance pipe 5 is too large and exceeds the limit position of the elastic valve plate 428 running downward, the function of the gas balance valve 42 will be partially invalidated, by setting a cut-off pressure limit for the inlet cut-off valve 44b, and making the cut-off pressure limit less than or equal to the limit pressure, when the cut-off pressure limit is reached, the inlet cut-off valve 44b is cut off, and when it is less than the cut-off pressure limit, the inlet cut-off valve 44b is opened; the outlet cut-off valve 44c is set with a pressure limit, when it is less than or equal to the pressure limit, the outlet cut-off valve 44c is closed, when it exceeds the pressure limit, the outlet cut-off valve 44c is opened, and discharged to the air through the gas flow valve 45 connected thereto, to avoid danger caused by excessive pressure in the buffer tank 7;The gas flow valve 45 of each branch pipe 21 sets the flow rate according to the mixing ratio, and the gas of each branch pipe 21 is mixed in the main pipe 31 to form a mixed gas that meets the ratio requirements.

[0026] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multi-element gas proportioning cabinet, comprising a cabinet body (1), characterized in that: The cabinet is provided with at least two inlets (2) and one outlet (3); the inlets (2) are respectively connected to branch pipes (21); the branch pipes (21) are provided with a pressure regulating valve (41), a gas balancing valve (42), a one-way valve (43), a cut-off valve (44a), and a gas flow valve (45) in sequence; the ends of the branch pipes (21) are all connected to a main pipe (31); the main pipe (31) is connected to the outlet (3); the gas balancing valve (42) is provided with a balancing gas inlet (421); the balancing gas inlets (421) of the plurality of gas balancing valves (42) are all connected to a gas balancing pipe (5); a bypass pipe (6) is provided between the pressure regulating valve (41) of one branch pipe (21) and the gas balancing valve (42); the ends of the bypass pipe (6) are connected to the gas balancing pipe (5); the plurality of branch pipes (21) have the same inner diameter.

2. A multi-element gas proportioning cabinet according to claim 1, characterized in that: The gas balancing valve (42) is provided with an air inlet (422) and an air outlet (423), the air inlet (422) and the air outlet (423) are connected to the branch pipe (21), the other end of the air outlet (423) is connected to the pressure-bearing chamber (425) through the air flow channel (424), a spring (426) is provided in the pressure-bearing chamber (425), the spring (426) is connected to the opening adjustment rod (427), the opening adjustment rod (427) is connected to the elastic valve plate (428), the circumferential edge of the elastic valve plate (428) is fixed and seals the gas The air flow channel (424) is provided with an opening adjustment rod (427) which is arranged in the air flow channel (424) and has a clearance fit with the air flow channel (424), and the opening adjustment rod (427) can close the air flow channel (424) through an end portion connected to a spring (426); the other end of the air inlet (422) is connected to an outer wall of a pressure-bearing chamber (425) through a chamber, and an air hole (429) is provided on the pressure-bearing chamber (425); and one end of the elastic valve plate (428) which is away from the opening adjustment rod (427) is connected to a balancing air inlet (421).

3. A multi-element gas proportioning cabinet according to claim 1, characterized in that: A buffer tank (7) is further provided between the bypass pipe (6) and the gas balance pipe (5); the buffer tank (7) is provided with a tank inlet (71), a tank outlet (72), and a balance gas outlet (73); the bypass pipe (6) is connected to the tank inlet (71), and the balance gas outlet (73) is connected to the gas balance pipe (5); an inlet shut-off valve (44b) is further provided on the bypass pipe (6); the tank outlet (72) is connected to the outlet shut-off valve (44c), and the outlet shut-off valve (44c) is connected to a gas flow valve (45).

4. A multi-element gas proportioning cabinet according to claim 1, characterized in that: A low pressure alarm (46) is also provided between the pressure regulating valve (41) of the branch pipe (21) and the inlet (2).

5. A multi-element gas proportioning cabinet according to claim 1, characterized in that: The main pipe is also provided with a gas content detection port (47).

6. A multi-element gas proportioning cabinet according to claim 5, characterized in that: The cabinet (1) is provided with two inlets (2), the branch pipes (21) are provided in two pieces, one of the branch pipes (21) is passed with argon gas, and the other of the branch pipes (21) is passed with carbon dioxide gas, and the gas content detection port (47) is used to detect the carbon dioxide gas content.

Images