Gas-liquid logic valve block

Abstract

The invention discloses a gas-liquid logic valve block which comprises a valve body, a liquid inlet, a first liquid outlet and a second liquid outlet are formed in the valve body, and a flow channel communicated with the liquid inlet, the first liquid outlet and the second liquid outlet is formed in the valve body. A first pneumatic valve for controlling the first liquid outlet to be opened or closed is arranged at the position, corresponding to the first liquid outlet, of the valve body, and a second pneumatic valve for controlling the second liquid outlet to be opened or closed is arranged at the position, corresponding to the second liquid outlet, of the valve body; the first pneumatic valve is provided with a first valve closing air inlet and a first valve opening air inlet, the second pneumatic valve is provided with a second valve closing air inlet and a second valve opening air inlet, and the first valve closing air inlet and the second valve opening air inlet are connected with the same air source. And the first valve opening air inlet and the second valve closing air inlet are connected with the same source. The liquid outlet switching device has the advantages of simple and reasonable structure, convenience in control and high liquid outlet switching speed.

Description

Technical Field

[0001] This invention relates to the field of logic control valve technology, specifically a gas-liquid logic valve block. Background Technology

[0002] In the cooling water circulation system of a machine tool, a continuous output of cooling water is required during machining, while the cooling water at the tool head needs to be shut off when machining stops. Since some chips are often mixed in the cooling water, a filter is usually installed in the cooling water system to filter out impurities. The original practice for machine tools was to directly install the filter in the circulating water circuit and complete the filtration during the circulation of the cooling water. However, the installation of the filter will affect the output pressure of the cooling water and affect the output effect.

[0003] Another approach is to separate the cutter head cooling water path from the filter water path. In this way, the cooling water circulation system will have at least two branches: one to the cutter head for cooling during machining, and the other to the filter for filtering the cooling water. In this case, a three-way valve can be used in the cooling water circulation system.

[0004] A three-way valve, as the name suggests, has three connection ports. Generally, one port is used as the input, and the remaining two as the output ports. Three-way valves are often used for flow diversion. For example, application number CN202320832657.9, entitled "A Cross-Shaped Three-Way Integrated Valve," includes a valve body, valve core, valve stem, and pneumatic actuator. The valve body has an inflow channel and two outflow channels. The two outflow channels are coaxially arranged and located below the inflow channel. The projections of the inflow and outflow channels on the same horizontal plane form a cross shape. The valve core is located in the valve body and can control the opening and closing of the inflow and outflow channels. This cross-shaped three-way integrated valve can achieve flow diversion. However, this type of three-way valve obviously cannot meet the requirements of machine tool cooling water circulation. In machine tool cooling water circulation, two output ports need to be selectively opened; therefore, its structure needs further improvement. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned deficiencies and to disclose to the public a gas-liquid logic valve block that is simple and reasonable in structure, convenient to control, and has a fast liquid outlet switching speed.

[0006] The technical solution of this invention is implemented as follows: A gas-liquid logic valve block includes a valve body, on which an inlet, a first outlet, and a second outlet are provided. A flow channel communicating with the inlet, the first outlet, and the second outlet is provided inside the valve body. A first pneumatic valve for controlling the opening or closing of the first outlet is provided on the valve body at the position corresponding to the first outlet, and a second pneumatic valve for controlling the opening or closing of the second outlet is provided on the valve body at the position corresponding to the second outlet. The first pneumatic valve is provided with a first closed valve inlet and a first open valve inlet, and the second pneumatic valve is provided with a second closed valve inlet and a second open valve inlet. The first closed valve inlet and the second open valve inlet are connected to the same air source, and the first open valve inlet and the second closed valve inlet are connected to the same source.

[0007] Further optimization measures for this technical solution are as follows: As an improvement, the first pneumatic valve includes a first valve sleeve, a first valve core, and a first pneumatic component that drives the first valve core to move. A gap is left between the middle part of the first valve sleeve and the valve body. The first valve sleeve is provided with a first liquid inlet hole communicating with the flow channel and a first liquid outlet hole communicating with the first liquid outlet hole. Under the drive of the first pneumatic component, the first valve core can open or close the channel between the first liquid inlet hole and the first liquid outlet hole.

[0008] When the first valve core moves between the first inlet and the first outlet, the passage between the first inlet and the first outlet is blocked by the first valve core, and the first pneumatic valve is in the closed state, at which time the first outlet is closed; when the first valve core moves to release the blockage of the passage between the first inlet and the first outlet, the first pneumatic valve is in the open state.

[0009] As an improvement, the first pneumatic component includes a first cylinder body, a first cylinder piston is disposed within the first cylinder body, a first cylinder piston rod is connected to the first cylinder piston with one end extending out of the first cylinder body, and the first cylinder piston rod is connected to a first valve core; a first closed valve chamber and a first open valve chamber are formed on both sides of the first cylinder piston within the first cylinder body, the first closed valve inlet communicates with the first closed valve chamber, and the first open valve inlet communicates with the first open valve chamber.

[0010] When air enters the first closed valve chamber, the air pressure inside the first closed valve chamber is greater than the air pressure inside the first open valve chamber. The piston rod of the first cylinder pushes the first valve core downward, causing the first pneumatic valve to close. Conversely, when air enters the first open valve chamber, the air pressure inside the first open valve chamber is greater than the air pressure inside the first closed valve chamber. The piston rod of the first cylinder pulls the first valve core upward, causing the first pneumatic valve to open.

[0011] As an improvement, the first inlet holes are radially evenly distributed on the first valve sleeve, and the first outlet holes are axially disposed on the first valve sleeve. This arrangement ensures that the first inlet holes face the flow channel, and the first outlet holes face the first outlet, allowing for smoother flow of the medium within the valve body.

[0012] As an improvement, the second pneumatic valve includes a second valve sleeve, a second valve core, and a second pneumatic component that drives the second valve core to move. A gap is left between the middle part of the second valve sleeve and the valve body. The second valve sleeve is provided with a second inlet hole communicating with the flow channel and a second outlet hole communicating with the second outlet hole. Under the drive of the second pneumatic component, the second valve core can open or close the channel between the second inlet hole and the second outlet hole.

[0013] When the second valve core moves between the second inlet and the second outlet, the passage between the second inlet and the second outlet is blocked by the second valve core, and the second pneumatic valve is in the closed state, at which time the second outlet is closed; when the second valve core moves to release the blockage of the passage between the second inlet and the second outlet, the second pneumatic valve is in the open state.

[0014] As an improvement, the second pneumatic component includes a second cylinder body, a second cylinder piston is disposed within the second cylinder body, a second cylinder piston rod is connected to the second cylinder piston with one end extending out of the second cylinder body, and the second cylinder piston rod is connected to a second valve core; a second closed valve chamber and a second open valve chamber are formed on both sides of the second cylinder piston within the second cylinder body, the second closed valve inlet communicates with the second closed valve chamber, and the second open valve inlet communicates with the second open valve chamber.

[0015] When air enters the second closed valve chamber, the air pressure inside the second closed valve chamber is greater than the air pressure inside the second open valve chamber. The piston rod of the second cylinder pushes the second valve core downward, causing the second pneumatic valve to close. Conversely, when air enters the second open valve chamber, the air pressure inside the second open valve chamber is greater than the air pressure inside the second closed valve chamber. The piston rod of the second cylinder pulls the second valve core upward, causing the second pneumatic valve to open.

[0016] As an improvement, the second inlet hole is radially disposed on the second valve sleeve, and the second outlet hole is axially disposed on the second valve sleeve.

[0017] This configuration, where the second inlet hole faces the flow channel and the second outlet hole faces the second outlet, allows for smoother flow of the medium within the valve body.

[0018] As an improvement, the flow channel is horizontally positioned within the valve body, the first pneumatic valve is perpendicular to the flow channel and vertically positioned, and the second pneumatic valve is perpendicular to the flow channel and horizontally positioned. This arrangement makes the structure more compact.

[0019] As an improvement, a pressure sensor is provided on the valve body corresponding to the second liquid outlet position.

[0020] As an improvement, the valve body is provided with an overflow port communicating with the flow channel, and a relief valve is provided at the corresponding position to control the opening or closing of the overflow port. When the pressure inside the valve body is too high, the relief valve opens to discharge the medium inside the valve body to achieve the purpose of pressure relief and protect the safe use of the logic valve block.

[0021] The advantages of this invention compared to the prior art are: This invention discloses a pneumatic-liquid logic valve block with a simple and reasonable structure. A first pneumatic valve is positioned at the first liquid outlet, and a second pneumatic valve is positioned at the second liquid outlet. The first and second pneumatic valves are linked; when the first pneumatic valve is open, the second pneumatic valve is closed, and vice versa, when the first pneumatic valve is closed, the second pneumatic valve is open, thereby achieving selective opening of the first and second liquid outlets. Using pneumatic components to control the opening and closing of the pneumatic valves provides a fast response speed and rapid switching. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram from another perspective of an embodiment of the present invention; Figure 3 This is a front view of an embodiment of the present invention; Figure 4 yes Figure 3 Cross-sectional view of AA; Figure 5 yes Figure 3 Cross-sectional view of the structure of BB; Figure 6 yes Figure 3 Cross-sectional view of the CC structure.

[0023] The names of the reference numerals in the accompanying drawings of this invention are: Valve body 1, flow channel 1a, liquid inlet 11, first liquid outlet 12, second liquid outlet 13, overflow port 14, first pneumatic valve 2, first closed valve air inlet 2a, first open valve air inlet 2b, first valve sleeve 21, first liquid inlet hole 21a, first liquid outlet hole 21b, first valve core 22, second pneumatic valve 3, second closed valve air inlet 3a, second open valve air inlet 3b, second valve sleeve 31, second liquid inlet hole 31a, second liquid outlet hole 31b, second valve core 32, first pneumatic component 4, first cylinder body 41, first closed valve air chamber 41a, first open valve air chamber 41b, first cylinder piston 42, first cylinder piston rod 43, second pneumatic component 5, second cylinder body 51, second closed valve air chamber 51a, second open valve air chamber 51b, second cylinder piston 52, second cylinder piston rod 53, pressure sensor 6, overflow valve 7. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings: The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0025] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this invention and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this invention.

[0026] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0027] like Figures 1 to 6As shown, a gas-liquid logic valve block includes a valve body 1, which is provided with an inlet 11, a first outlet 12 and a second outlet 13. The valve body 1 is provided with a flow channel 1a that communicates with the inlet 11, the first outlet 12 and the second outlet 13. A first pneumatic valve 2 is provided on the valve body 1 at the position corresponding to the first outlet 12 to control the opening or closing of the first outlet 12. A second pneumatic valve 3 is provided on the valve body 1 at the position corresponding to the second outlet 13 to control the opening or closing of the second outlet 13. like Figure 5 As shown, the first pneumatic valve 2 is provided with a first closed valve inlet 2a and a first open valve inlet 2b, and the second pneumatic valve 3 is provided with a second closed valve inlet 3a and a second open valve inlet 3b. The first closed valve inlet 2a and the second open valve inlet 3b are connected to the same air source, and the first open valve inlet 2b and the second closed valve inlet 3a are connected to the same source.

[0028] The logic valve block of the present invention has a first pneumatic valve 2 located at the position corresponding to the first liquid outlet 12 and a second pneumatic valve 3 located at the position corresponding to the second liquid outlet 13, and the first pneumatic valve 2 and the second pneumatic valve 3 are linked together. Specifically, by connecting one air port of the first pneumatic valve 2 and the second pneumatic valve 3 to the same air source, the purpose of controlling two pneumatic valves simultaneously with one air source is achieved. More specifically, one air source is connected to the first closed valve inlet 2a and the second open valve inlet 3b. When air enters through this air source, the first pneumatic valve 2 is closed and the second pneumatic valve 3 is open. The other air source is connected to the first open valve inlet 2b and the second closed valve inlet 3a. When air enters through this air source, the first pneumatic valve 2 is open and the second pneumatic valve 3 is closed.

[0029] The first pneumatic valve 2 includes a first valve sleeve 21, a first valve core 22, and a first pneumatic component 4 for driving the first valve core 22. A gap is left between the middle part of the first valve sleeve 21 and the valve body 1. The first valve sleeve 21 is provided with a first liquid inlet hole 21a communicating with the flow channel 1a and a first liquid outlet hole 21b communicating with the first liquid outlet 12. Under the drive of the first pneumatic component 4, the first valve core 22 can open or close the channel between the first liquid inlet hole 21a and the first liquid outlet hole 21b.

[0030] A sealing ring is provided between the first valve sleeve 21 and the valve body 1, and a sealing ring is also provided between the first valve sleeve 21 and the first valve core 22.

[0031] The first pneumatic component 4 includes a first cylinder body 41, a first cylinder piston 42 disposed inside the first cylinder body 41, a first cylinder piston rod 43 with one end extending out of the first cylinder body 41 connected to the first cylinder piston 42, and the first cylinder piston rod 43 connected to the first valve core 22; a first closed valve chamber 41a and a first open valve chamber 41b are formed on both sides of the first cylinder piston 42 inside the first cylinder body 41, the first closed valve inlet 2a communicates with the first closed valve chamber 41a, and the first open valve inlet 2b communicates with the first open valve chamber 41b.

[0032] The first inlet holes 21a are radially distributed on the first valve sleeve 21, and the first outlet holes 21b are axially disposed on the first valve sleeve 21. In this embodiment, a plurality of first inlet holes 21a are evenly distributed on the circumferential surface of the middle part of the first valve sleeve 21. The arrangement of multiple first inlet holes 21a can improve the liquid inlet speed. Moreover, the first inlet holes 21a are positioned directly opposite the flow channel 1a, and the first outlet holes 21b are positioned directly opposite the first outlet port 12. This arrangement can improve the flow velocity of the medium inside the valve.

[0033] Separately, the first pneumatic valve 2, as a control component for opening or closing the first liquid outlet 12, is driven by the first pneumatic component 4 to move the first valve core 22, thereby opening or closing the first pneumatic valve 2. Specifically, when gas enters the first closed valve chamber 41a from the first closed valve inlet 2a, the gas in the first open valve chamber 41b is discharged from the first open valve inlet 2b. At this time, the pressure in the first closed valve chamber 41a will be greater than the pressure in the first open valve chamber 41b, thereby pushing the first cylinder piston 42 to move downward. The first cylinder piston 42 pushes the first valve core 22 downward through the first cylinder piston rod 43, so that the first valve core 22 is located between the first liquid inlet 21a and the first liquid outlet 21b. At this time, the passage between the first liquid inlet 21a and the first liquid outlet 21b is blocked by the first valve core 22, and the first pneumatic valve 2 is in a closed state. Correspondingly, the first liquid outlet 12 is also in a closed state.

[0034] Conversely, when gas enters the first open valve chamber 41b from the first open valve inlet 2b, the gas in the first closed valve chamber 41a is discharged from the first closed valve inlet 2a. At this time, the pressure in the first open valve chamber 41b will be greater than the pressure in the first closed valve chamber 41a, thereby pushing the first cylinder piston 42 to move upward, and then pushing the first valve core 22 to move upward, so that the first valve core 22 leaves the channel between the first liquid inlet 21a and the first liquid outlet 21b. At this time, the first liquid inlet 21a and the first liquid outlet 21b are connected, the first pneumatic valve 2 is in the open state, and correspondingly, the first liquid outlet 12 is also in the open state.

[0035] like Figure 6 As shown, the structure of the second pneumatic valve 3 is the same as that of the first pneumatic valve 2. The second pneumatic valve 3 includes a second valve sleeve 31, a second valve core 32, and a second pneumatic component 5 for driving the second valve core 32. A gap is left between the middle part of the second valve sleeve 31 and the valve body 1. The second valve sleeve 31 is provided with a second liquid inlet hole 31a communicating with the flow channel 1a and a second liquid outlet hole 31b communicating with the second liquid outlet 13. Under the drive of the second pneumatic component 5, the second valve core 32 can open or close the channel between the second liquid inlet hole 31a and the second liquid outlet hole 31b.

[0036] A sealing ring is provided between the second valve sleeve 31 and the valve body 1, and a sealing ring is also provided between the second valve sleeve 31 and the second valve core 32.

[0037] The second pneumatic component 5 includes a second cylinder body 51, a second cylinder piston 52 is disposed inside the second cylinder body 51, a second cylinder piston rod 53 is connected to the second cylinder piston 52 with one end extending out of the second cylinder body 51, and the second cylinder piston rod 53 is connected to the second valve core 32; a second closed valve air chamber 51a and a second open valve air chamber 51b are formed on both sides of the second cylinder piston 52 inside the second cylinder body 51, the second closed valve air inlet 3a communicates with the second closed valve air chamber 51a, and the second open valve air inlet 3b communicates with the second open valve air chamber 51b.

[0038] The second inlet hole 31a is radially disposed on the second valve sleeve 31, and the second outlet hole 31b is axially disposed on the second valve sleeve 31. Similarly, in this embodiment, a plurality of second inlet holes 31a are evenly distributed on the circumferential surface of the middle part of the second valve sleeve 31. The arrangement of multiple second inlet holes 31a can improve the inlet speed. Furthermore, the second inlet holes 31a are positioned directly opposite the flow channel 1a, and the second outlet holes 31b are positioned directly opposite the second outlet port 13. This arrangement can increase the flow velocity of the medium inside the valve.

[0039] Breaking it down, the working principle of the second pneumatic valve 3 is the same as that of the first pneumatic valve 2. Specifically, the second pneumatic valve 3 is a control component that controls the opening or closing of the second liquid outlet 13. It is driven by the second pneumatic component 5 to move the second valve core 32, thereby realizing the opening or closing of the second pneumatic valve 3. Specifically, when gas enters the second closed valve chamber 51a from the second closed valve inlet 3a, the gas in the second open valve chamber 51b is discharged from the second open valve inlet 3b. At this time, the pressure in the second closed valve chamber 51a will be greater than the pressure in the second open valve chamber 51b, thereby pushing the second cylinder piston 52 to move downward. The second cylinder piston 52 pushes the second valve core 32 downward through the second cylinder piston rod 53, so that the second valve core 32 is located between the second liquid inlet 31a and the second liquid outlet 31b. At this time, the channel between the second liquid inlet 31a and the second liquid outlet 31b is blocked by the second valve core 32, and the second pneumatic valve 3 is in the closed state. Correspondingly, the second liquid outlet 13 is also in the closed state.

[0040] Conversely, when gas enters the second open valve chamber 51b from the second open valve inlet 3b, the gas in the second closed valve chamber 51a is discharged from the second closed valve inlet 3a. At this time, the pressure in the second open valve chamber 51b will be greater than the pressure in the second closed valve chamber 51a, thereby pushing the second cylinder piston 52 to move upward, and then pushing the second valve core 32 to move upward, so that the second valve core 32 leaves the channel between the second liquid inlet 31a and the second liquid outlet 31b. At this time, the second liquid inlet 31a and the second liquid outlet 31b are connected, the second pneumatic valve 3 is in the open state, and correspondingly, the second liquid outlet 13 is also in the open state.

[0041] On valve body 1, inlet 11 is horizontally positioned, first outlet 12 is vertically positioned, second outlet 13 is horizontally positioned, overflow 14 is vertically positioned, and flow channel 1a is horizontally positioned along the direction of inlet 11. That is, first outlet 12 is perpendicular to flow channel 1a and lies on the same vertical plane as flow channel 1a; second outlet 13 is perpendicular to flow channel 1a and lies on the same horizontal plane as flow channel 1a. First outlet 12 and second outlet 13 are spatially perpendicular, but they are not located in the same plane.

[0042] The flow channel 1a is horizontally disposed within the valve body 1. The first pneumatic valve 2 is perpendicular to and vertically disposed with respect to the flow channel 1a, and the second pneumatic valve 3 is perpendicular to and horizontally disposed with respect to the flow channel 1a. This arrangement allows the entire logic valve block structure to be more compact and occupies less space.

[0043] A pressure sensor 6 is installed on the valve body 1 at the position corresponding to the second outlet 13. In application, the second outlet 13 is connected to the workpiece cooling pipe, and the first outlet 12 is connected to the filter pipe (connected to the filter). Here, the pressure sensor 6 is installed at the position of the second outlet 13 to detect the water pressure at the second outlet 13, so as to ensure the water pressure of the cooling water during workpiece processing (the cooling water is used for chip breaking at the same time, so a certain water pressure needs to be maintained).

[0044] The valve body 1 is provided with an overflow port 14 communicating with the flow channel 1a, and an overflow valve 7 is provided at the position of the overflow port 14 to control the opening or closing of the overflow port 14. The overflow valve 7 is existing technology and can be purchased directly from the market; its specific structure will not be elaborated here.

[0045] The gas-liquid logic valve block of the present invention has a liquid conveying structure inside the valve body 1, and uses a pneumatic component as the control power source for the pneumatic valve 2. It adopts pneumatic control, has a simple structure, fast response speed, and can improve the switching speed between the first liquid outlet 12 and the second liquid outlet 13. During use, even if the pneumatic valve 2 leaks, it will not cause pollution to the cooling water.

[0046] The first pneumatic valve 2 and the second pneumatic valve 3 installed on the valve body 1 are linked. Specifically, the first pneumatic valve 2 and the second pneumatic valve 3 are always in an open-closed state. During application, when the workpiece needs to be cooled (i.e., when liquid needs to be discharged from the second outlet 13), the second pneumatic valve 3 opens while the first pneumatic valve 2 closes. At this time, the cooling water flowing into the flow channel 1a from the inlet 11 flows through the gap between the first valve sleeve 21 and the valve body 1 to the second pneumatic valve 3, flows into the second valve sleeve 31 from the second inlet hole 31a, and then flows out from the second outlet 13 through the second outlet hole 31b. When the cooling water needs to be filtered (i.e., when liquid needs to be discharged from the first outlet 12), the first pneumatic valve 2 opens while the second pneumatic valve 3 closes. At this time, the cooling water flowing into the flow channel 1a from the inlet 11 flows into the first valve sleeve 21 from the first inlet hole 21a, and then flows out from the first outlet 12 through the first outlet hole 21b. By leveraging the coordinated operation of the first pneumatic valve 2 and the second pneumatic valve 3 on valve body 1, selective liquid discharge from either the first liquid outlet 12 or the second liquid outlet 13 can be achieved. This design is simple and easy to control. Furthermore, since the control air source is the same, the switching of the first pneumatic valve 2 and the second pneumatic valve 3 can be performed simultaneously, greatly improving switching efficiency.

[0047] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A gas-liquid logic valve block comprising a valve body (1) provided with a liquid inlet (11), a first liquid outlet (12) and a second liquid outlet (13), characterized in that: The valve body (1) is provided with a flow channel (1a) that communicates with the liquid inlet (11), the first liquid outlet (12), and the second liquid outlet (13). A first pneumatic valve (2) is provided on the valve body (1) at the position corresponding to the first liquid outlet (12) to control the opening or closing of the first liquid outlet (12). A second pneumatic valve (3) is provided on the valve body (1) at the position corresponding to the second liquid outlet (13) to control the opening or closing of the second liquid outlet (13). The first pneumatic valve (2) is provided with a first closed valve inlet (2a) and a first open valve inlet (2b), and the second pneumatic valve (3) is provided with a second closed valve inlet (3a) and a second open valve inlet (3b). The first closed valve inlet (2a) and the second open valve inlet (3b) are connected to the same air source, and the first open valve inlet (2b) and the second closed valve inlet (3a) are connected to the same source.

2. A gas-liquid logic valve block according to claim 1, characterized in that: The first pneumatic valve (2) includes a first valve sleeve (21), a first valve core (22), and a first pneumatic component (4) for driving the first valve core (22). A gap is left between the middle part of the first valve sleeve (21) and the valve body (1). The first valve sleeve (21) is provided with a first liquid inlet (21a) communicating with the flow channel (1a) and a first liquid outlet (21b) communicating with the first liquid outlet (12). Under the drive of the first pneumatic component (4), the first valve core (22) can open or close the channel between the first liquid inlet (21a) and the first liquid outlet (21b).

3. A gas-liquid logic valve block according to claim 2, characterized in that: The first pneumatic component (4) includes a first cylinder body (41), a first cylinder piston (42) is provided inside the first cylinder body (41), a first cylinder piston rod (43) with one end extending out of the first cylinder body (41) is connected to the first cylinder piston (42), and the first cylinder piston rod (43) is connected to the first valve core (22); a first closed valve chamber (41a) and a first open valve chamber (41b) are formed on both sides of the first cylinder piston (42) inside the first cylinder body (41), the first closed valve inlet (2a) communicates with the first closed valve chamber (41a), and the first open valve inlet (2b) communicates with the first open valve chamber (41b).

4. A gas-liquid logic valve block according to claim 3, characterized in that: The first inlet hole (21a) is radially evenly distributed on the first valve sleeve (21), and the first outlet hole (21b) is axially disposed on the first valve sleeve (21).

5. A gas-liquid logic valve block according to claim 1, characterized in that: The second pneumatic valve (3) includes a second valve sleeve (31), a second valve core (32), and a second pneumatic component (5) for driving the second valve core (32). A gap is left between the middle part of the second valve sleeve (31) and the valve body (1). The second valve sleeve (31) is provided with a second inlet hole (31a) communicating with the flow channel (1a) and a second outlet hole (31b) communicating with the second outlet (13). Under the drive of the second pneumatic component (5), the second valve core (32) can open or close the channel between the second inlet hole (31a) and the second outlet hole (31b).

6. A gas-liquid logic valve block according to claim 5, characterized in that: The second pneumatic component (5) includes a second cylinder body (51), a second cylinder piston (52) is provided inside the second cylinder body (51), a second cylinder piston rod (53) with one end extending out of the second cylinder body (51) is connected to the second cylinder piston (52), and the second cylinder piston rod (53) is connected to the second valve core (32); a second closed valve air chamber (51a) and a second open valve air chamber (51b) are formed on both sides of the second cylinder piston (52) inside the second cylinder body (51), the second closed valve air inlet (3a) communicates with the second closed valve air chamber (51a), and the second open valve air inlet (3b) communicates with the second open valve air chamber (51b).

7. A gas-liquid logic valve block according to claim 6, characterized in that: The second inlet hole (31a) is radially disposed on the second valve sleeve (31), and the second outlet hole (31b) is axially disposed on the second valve sleeve (31).

8. A gas-liquid logic valve block according to any one of claims 1 to 7, characterized in that: The flow channel (1a) is horizontally arranged inside the valve body (1), the first pneumatic valve (2) is perpendicular to the flow channel (1a) and is arranged vertically, and the second pneumatic valve (3) is perpendicular to the flow channel (1a) and is arranged horizontally.

9. A gas-liquid logic valve block according to claim 8, characterized in that: A pressure sensor (6) is provided on the valve body (1) at the position corresponding to the second liquid outlet (13).

10. A gas-liquid logic valve block according to claim 9, characterized in that: The valve body (1) is provided with an overflow port (14) communicating with the flow channel (1a), and an overflow valve (7) is provided at the position of the overflow port (14) to control the opening or closing of the overflow port (14).

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