Control valves, ventilators and veterinary anaesthesia breathing apparatuses

Abstract

The application discloses a control valve, a breathing machine and a veterinary anesthetic breathing device. The control valve comprises a valve body and a valve plate assembly. The valve body is provided with a flow channel, an inlet communicated with one end of the flow channel and an outlet communicated with the other end of the flow channel. The valve plate assembly is installed in the valve body. The valve plate assembly is used for controlling the opening and closing of the flow channel. The valve body and the valve plate assembly enclose a gas cavity. The valve body or the valve plate assembly is provided with a damping hole. The damping hole is communicated with the gas cavity and the outlet, or the damping hole is communicated with the gas cavity and the outside of the control valve. The control valve disclosed by the application is provided with the damping hole. The valve plate assembly runs smoothly in the valve body and does not vibrate. The noise generated during the operation of the control valve can be effectively reduced, and the influence of the noise on the rest of the patient is avoided.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to control valves, ventilators, and veterinary anesthesia breathing equipment. Background Technology

[0002] A check valve is a type of valve that allows fluid to flow in only one direction. Its working principle is that when the pressure at the inlet of the check valve is greater than the pressure at the outlet, the valve opens and the fluid can flow normally; when the pressure at the outlet is greater than the pressure at the inlet, the valve closes and the fluid at the outlet is cut off.

[0003] Most existing one-way valves have a through hole in the valve body, through which a valve core passes. A spring is fitted onto the valve core, and the spring compresses the valve core. When the pressure at the inlet end exceeds the spring force, the valve core opens. Existing one-way valves vibrate and make abnormal noises during operation. When used on a ventilator, these valves can affect the patient's rest, and the springs are prone to damage, leading to valve failure. Summary of the Invention

[0004] In view of this, the present invention proposes a control valve, a ventilator, and a veterinary anesthesia breathing device.

[0005] A first aspect of the present invention provides a control valve, comprising a valve body and a valve plate assembly. The valve body has a flow channel, an inlet communicating with one end of the flow channel, and an outlet communicating with the other end of the flow channel. The valve plate assembly is mounted on the valve body and is used to control the opening and closing of the flow channel. The valve body and the valve plate assembly enclose a gas cavity. The valve body or the valve plate assembly has a damping orifice communicating with the gas cavity and the outlet, or communicating with the gas cavity and the outside of the control valve.

[0006] A second aspect of the invention provides a ventilator including a gas supply device, a conduit, and the aforementioned control valve, wherein the gas supply device provides ventilation to a patient through the conduit, and the control valve is installed in the conduit to control the flow of gas.

[0007] A third aspect of the present invention provides a veterinary anesthesia breathing device, comprising a gas supply device, a pipeline, and the aforementioned control valve, wherein the gas supply device supplies air to a target object through the pipeline, and the control valve is installed in the pipeline to control the flow of gas.

[0008] As can be seen from the above technical solution, the control valve proposed in the first aspect of the present invention, by setting a damping orifice, enables the valve plate assembly to operate smoothly in the valve body without vibration, which can effectively reduce the noise generated during the operation of the control valve and avoid the noise affecting the patient's rest. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the control valve structure proposed in an embodiment of the present invention;

[0011] Figure 2 yes Figure 1 Schematic diagram of the cross section of AA;

[0012] Figure 3 yes Figure 2 A magnified view of a portion of point B in the middle;

[0013] Figure 4 This is an exploded schematic diagram of the control valve proposed in an embodiment of the present invention;

[0014] Figure 5 This is a schematic diagram of a modified version of the piston core, cylinder, and valve plate proposed in an embodiment of the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0017] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0018] like Figures 1 to 5As shown, an embodiment of the present invention provides a control valve 100 for use in a ventilator or veterinary anesthesia breathing device. The control valve 100 includes a valve body 10 and a valve plate assembly 20. The body 10 has a flow channel 101, an inlet 102 communicating with one end of the flow channel 101, and an outlet 103 communicating with the other end of the flow channel 101. The valve plate assembly 20 is slidably installed inside the valve body 10. The valve plate assembly 20 is used to control the opening and closing of the flow channel 101. The valve body 10 and the valve plate assembly 20 enclose an air chamber 104. The valve body 10 or the valve plate assembly 20 has a damping hole 105, which communicates the air chamber 104 and the outlet 103, or the damping hole 105 communicates the air chamber 104 and the outside of the control valve 100.

[0019] The control valve 100 proposed in this embodiment of the invention is vertically installed on a ventilator or veterinary anesthesia breathing device. The valve plate assembly 20 slides down to the flow channel 101 under its own weight, cutting off the flow channel 101. When fluid enters the flow channel 101 from the inlet 102, the fluid pushes open the valve plate assembly 20, causing the valve plate assembly 20 to rise, and the fluid flows out from the outlet 103. During the process of the valve plate assembly 20 rising to compress the air chamber 104, the air in the air chamber 104 can be discharged from the damping hole 105. The valve plate assembly 20 will not vibrate or produce abnormal noise due to excessive gas pressure in the air chamber 104. During the process of the valve plate assembly 20 descending to expand the air chamber 104, the cylinder 12 can replenish air into the air chamber 104 through the damping hole 105, so that the valve plate assembly 20 descends slowly.

[0020] The control valve 100 proposed in this embodiment, by setting a damping orifice 105, enables the valve plate assembly 20 to operate smoothly within the valve body 10 without vibration, which can effectively reduce the noise generated during the operation of the control valve 100 and avoid the noise affecting the patient's rest.

[0021] Optionally, the control valve 100 can be a check valve, a three-way valve, etc. When the control valve 100 is a check valve, the valve plate assembly 20 controls the opening and closing of the flow channel 101 so that the fluid can only flow from the inlet 102 to the outlet 103.

[0022] It should be noted that the diameter of the damping orifice 105 should be set to an appropriate size so that the valve plate assembly 20 can rise and fall smoothly. In one embodiment, the diameter of the damping orifice 105 is any value between 0.1 and 10 mm.

[0023] Optionally, the valve body 10 includes a body 11 and a cylinder 12. The body 11 has an internal mounting groove 106, the cylinder 12 is installed in the mounting groove 106, the valve plate assembly 20 is slidably embedded in the cylinder 12, and the valve plate assembly 20 and the cylinder 12 form an air chamber 104. The cylinder 12 has a damping hole 105, which connects the air chamber 104 and the outlet 103.

[0024] In some other embodiments, the valve body 10 is not configured to include a body 11 and a cylinder 12, but is a single, integral component, i.e., the body 11 and the cylinder 12 are integrally formed, and the mounting groove 106 is provided inside the valve body 10. In this embodiment, a damping hole 105 is provided on the valve body 10, and the damping hole 105 communicates with the air chamber 104 and the outside of the control valve 100.

[0025] Optionally, the body 11 includes a valve seat 111 and a valve body 112 connected to the valve seat 111. The valve seat 111 is provided with a flow channel 101, and the valve body 112 is provided with the mounting groove 106. In some embodiments, the valve seat 111 and the valve body 112 may be integrally formed.

[0026] Optionally, the valve seat 111 has a first opening 107 and a second opening 108 on the side facing the valve body 112. The side wall of the valve seat 111 has an inlet 102 and an outlet 103. The first opening 107 communicates with the inlet 102, and the second opening 108 communicates with the outlet 103. The valve plate assembly 20 and the valve plate 22 cover the first opening 107. Fluid flows from the inlet 102 to the first opening 107, pushes open the valve plate assembly 20, enters the second opening 108 through the first opening 107, and flows out through the outlet 103. When the fluid flows back from the outlet 103, it is blocked at the first opening 107 due to the obstruction of the valve plate assembly 20.

[0027] Optionally, the valve plate assembly 20 includes a piston core 21 and a valve plate 22. The piston core 21 is interactively embedded in the cylinder 12, and the valve plate 22 is movably connected to the piston core 21. Due to possible errors during the manufacturing and assembly process, gaps may exist between the two components that should fit perfectly after assembly. In this embodiment, by setting the valve plate 22 to be movably connected to the piston core 21, the valve plate 22 can be adjusted to perfectly cover the first opening 107.

[0028] like Figure 5 As shown, it should be noted that in some other embodiments, the piston core and the cylinder can be interchanged. That is, the piston core 21' is fixedly installed inside the valve body 112', the cylinder 12' is sleeved outside the piston core 21', the valve plate 22' is connected to the cylinder 12', and the cylinder 12' slides up and down along the piston core 21' to drive the valve plate 22' to slide up and down.

[0029] Optionally, the valve plate assembly 20 further includes a connecting rod 23, one end of which is connected to the piston core 21, and the other end of which is connected to the valve plate 22. The portion of the connecting rod 23 located between the piston core 21 and the valve plate 22 includes at least an elastic segment. The elastic segment enables a movable connection between the valve plate 22 and the piston core 21. In some embodiments, the portion of the connecting rod 23 located between the piston core 21 and the valve plate 22 is made of an elastic material, for example, silicone.

[0030] It should be noted that the movable connection between the valve plate 22 and the piston core 21 is not limited to the above-mentioned elastic segment setting method. For example, the movable connection between the valve plate 22 and the piston core 21 can be achieved by using a ball joint.

[0031] Optionally, the outer diameter of the connecting rod 23 gradually decreases from the piston core 21 toward the valve plate 22. In this embodiment, the section of the connecting rod 23 connected to the valve plate 22 has greater flexibility, allowing the valve plate 22 to rotate flexibly and thus tightly cover the first opening 107.

[0032] Optionally, the cylinder 12 is made of any one of the following materials: metal, glass, ceramic, polytetrafluoroethylene (PTFE), polyformaldehyde (POM), polyetheretherketone (PEEK), and graphite. Alternatively, the inner wall of the cylinder may be provided with one of the following layers: metal, glass, ceramic, PTFE, POM, PEEK, and graphite. PTFE, POM, PEEK, and graphite are all wear-resistant and self-lubricating materials, which can extend the service life of the cylinder 12 and reduce the friction between the cylinder 12 and the piston core 21, thus ensuring smooth operation between them.

[0033] Optionally, the piston core 21 may be made of any one of the following materials: metal, glass, ceramic, polytetrafluoroethylene (PTFE), polyoxymethylene (POM), polyetheretherketone (PEEK), and graphite. Alternatively, the outer wall of the piston core may be provided with one of the following layers: metal, glass, ceramic, PTFE, POM, PEEK, and graphite. PTFE, POM, PEEK, and graphite are all wear-resistant and self-lubricating materials, which can extend the service life of the piston core 21 and reduce the friction between the cylinder 12 and the piston core 21, thus ensuring smooth operation between them.

[0034] Optionally, the piston core 21 includes a base plate 211 and a side wall 212 surrounding the base plate 211. The base plate 211 has a through hole 213. The outer side wall of the connecting rod 23 has a first latching part 231 and a second latching part 232 spaced apart from the first latching part 231. The connecting rod 23 passes through the through hole 213, and the first latching part 231 and the second latching part 232 are engaged on opposite sides of the base plate 211. Optionally, the first latching part 231 and the second latching part 232 can be made of elastic material. During installation, the connecting rod 23 is passed through the through hole 213 from one side of the base plate 211 and appropriately squeezed so that the first latching part 231 or the second latching part 232 passes through the through hole 213 and is engaged on the other side of the base plate 211, thus completing the installation between the connecting rod 23 and the piston core 21. Of course, the connection between the connecting rod 23 and the piston core 21 is not limited to the above-mentioned method. For example, the connection between the connecting rod 23 and the piston core 21 can also be achieved by threaded connection, bonding or integral injection molding.

[0035] Optionally, the first latching part 231 is located on the side of the base plate 211 opposite to the valve plate 22, and the outer diameter of the first latching part 231 gradually decreases in the direction away from the valve plate 22. This embodiment facilitates the first latching part 231 passing through the through hole 213, reducing the difficulty of installation.

[0036] Optionally, the connecting rod 23, the first latching part 231, the second latching part 232 and the valve plate 22 are integrally injection molded from elastic plastic, for example, integrally injection molded from silicone material, which is simple to manufacture.

[0037] Optionally, the valve body 112 has a mounting hole 109 on the side away from the valve seat 111, which communicates with the mounting groove 106. The cylinder 12 is mounted in the mounting groove 106 through the mounting hole 109. In the actual assembly process, the valve body 112 and the valve seat 111 can be assembled first, then the valve plate assembly 20 and the cylinder 12 can be assembled. Then, the assembly of the valve plate assembly 20 and the cylinder 12 can be installed into the valve body 112 through the mounting hole 109. The mounting hole 109 not only facilitates the assembly of the control valve 100 and improves assembly efficiency, but also facilitates the disassembly and replacement of the valve plate assembly 20 and the cylinder 12. When disassembling and assembling the valve plate assembly 20 and the cylinder 12, it is not necessary to disassemble the main body 10; simply remove the valve plate assembly 20 and the cylinder 12 from the mounting hole 109. Of course, it is also possible to install the valve plate assembly 20 and the cylinder 12 into the valve body 112 through the side of the valve body 112 connected to the valve seat 111 without the installation hole 109.

[0038] Optionally, the control valve 100 also includes a fastener 30, which is installed on the side of the valve body 112 away from the valve seat 111 and partially extends into the mounting hole 109. The fastener 30 is used to clamp the cylinder 12. Optionally, the fastener 30 is a flange bolt, and the side of the valve body 112 away from the valve seat 111 has a threaded hole. The flange bolt is threaded into the threaded hole and clamps the cylinder 12. Of course, the fastener 30 can also be a combination of a bolt and a gasket.

[0039] For example, the number of fasteners 30 is two, and the two fasteners 30 are provided on opposite sides of the mounting hole 109. The two fasteners 30 press the cylinder 12 against the cylinder 12 from opposite sides. The two fasteners can press the cylinder 12 more firmly. Of course, the number of fasteners 30 is not limited to two; there can be one or more, depending on the actual design requirements.

[0040] Optionally, the valve body 112 has a first flat surface 110 on the side wall of the mounting hole 109, and a second flat surface 12a is provided at the position where the cylinder 12 mates with the mounting hole 109. The second flat surface 12a and the first flat surface 110 cooperate to position the cylinder 12 on the valve body 112, preventing the cylinder 12 from rotating relative to the valve body 112. Of course, the positioning of the cylinder 12 and the valve body 112 is not limited to the above method. For example, a protrusion can be provided on one of the outer side wall of the cylinder 12 and the inner side wall of the mounting hole 109, and a groove can be provided on the other side wall of the cylinder 12 and the inner side wall of the mounting hole 109. When the cylinder 12 is installed in the mounting hole 109, the protrusion is embedded in the groove to form the positioning of the cylinder 12 and the valve body 112.

[0041] Optionally, the control valve 100 further includes a first sealing ring 40, which is sandwiched between the valve body 112 and the cylinder 12. The first sealing ring 40 is used to seal between the valve body 112 and the cylinder 12, preventing fluid from flowing from the gap between the valve body 112 and the cylinder 12 to the mounting hole 109 and spreading out.

[0042] Optionally, the outer wall of the cylinder 12 is provided with a first annular groove 121, and the first sealing ring 40 is embedded in the first annular groove 121. The first annular groove 121 is used for positioning the first sealing ring 40. Of course, the first annular groove 121 can also be provided on the inner wall of the valve body 112.

[0043] Optionally, the control valve 100 further includes a second sealing ring 50, which is sandwiched between the valve seat 111 and the valve body 112. The second sealing ring 50 is used to seal between the valve body 112 and the valve seat 111, preventing fluid from spreading out from the gap between the valve body 112 and the valve seat 111.

[0044] Optionally, the valve seat 111 has a second annular groove 1111 on the side facing the valve body 112, and the second sealing ring 50 is embedded in the second annular groove 1111. The second annular groove 1111 is used for positioning the second sealing ring 50. Of course, the second annular groove 1111 can also be provided on the side of the valve body 112 facing the valve seat 111.

[0045] Optionally, the valve seat 111 has a surrounding wall 1112 protruding from the inner side of the second annular groove 1111. One end of the valve body 112 connected to the valve seat 111 is sleeved on the surrounding wall 1112. The surrounding wall 1112 is used for mounting and positioning the valve body 112 on the valve seat 111. Optionally, the outline of the surrounding wall 1112 is annular.

[0046] Optionally, the control valve 100 also includes a gas connector 60, which is mounted on the valve seat 111 and communicates with the inlet 102. The gas connector 60 is used to connect to other gas pipelines or gas pressure monitoring equipment.

[0047] Optionally, the one-way valve 100 also includes a screw 70. The outer side wall of the valve body 112 near the valve seat 111 has a protruding mounting portion 1121. The screw 70 passes through the mounting portion 1121 and is threadedly connected to the valve seat 111 to fasten the valve body 112 to the valve seat 111.

[0048] An embodiment of the present invention also provides a ventilator, which includes an air supply device, a conduit, and the aforementioned control valve 100. The air supply device provides ventilation to the patient through the conduit, and the control valve 100 is installed in the conduit to control the flow of gas. The ventilator proposed in this embodiment, due to the use of the aforementioned control valve 100, has the advantages of low noise and minimal disruption to the patient's rest.

[0049] Optionally, the control valve 100 is installed vertically, and the valve plate assembly 20 is slidably connected to the valve body 10 in the vertical direction. The valve plate assembly 20 moves up and down inside the valve body 10 by its own weight and the thrust of the airflow.

[0050] An embodiment of the present invention provides a veterinary anesthesia breathing device, which includes a gas supply device, a pipeline and the aforementioned control valve 100. The gas supply device supplies gas to the target object through the pipeline, and the control valve 100 is installed on the pipeline to control the flow of gas.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A ventilator, characterized in that, It includes a gas supply device, a pipeline, and a control valve. The gas supply device supplies air to the patient through the pipeline, and the control valve is installed in the pipeline to control the flow of gas. The control valve includes a valve body and a valve plate assembly. The valve body has a flow channel, an inlet communicating with one end of the flow channel, and an outlet communicating with the other end of the flow channel. The valve plate assembly is slidably installed inside the valve body and is used to control the opening and closing of the flow channel. The valve body and the valve plate assembly enclose a gas cavity. The valve body or the valve plate assembly has a damping hole that communicates with the gas cavity and the outlet, or the damping hole communicates with the gas cavity and the outside of the control valve. The valve body includes a valve seat, a valve body, and a cylinder. The valve seat is provided with the flow channel, the valve body has an internal mounting groove, and the valve body has a mounting hole on the side away from the valve seat that communicates with the mounting groove. The cylinder is mounted in the mounting groove through the mounting hole. The cylinder has an opening on the side facing the valve seat. The valve plate assembly includes a piston core, a valve plate, and a connecting rod. The piston core is slidably embedded in the cylinder through the opening. The piston core and the cylinder enclose the air chamber. One end of the connecting rod is connected to the piston core, and the other end of the connecting rod is connected to the valve plate. The portion of the connecting rod between the piston core and the valve plate includes at least an elastic segment. The outer diameter of the elastic segment gradually decreases from the piston core toward the valve plate. The valve plate is movably connected to the piston core. The piston core includes a base plate and a side wall surrounding the base plate. The base plate has a through hole. The outer side wall of the connecting rod has a first latching part and a second latching part spaced apart from the first latching part. The connecting rod passes through the through hole. The first latching part and the second latching part are latched on opposite sides of the base plate. The first latching part is located on the side of the base plate away from the valve plate. The outer diameter of the first latching part gradually decreases in the direction away from the valve plate.

2. The ventilator as described in claim 1, characterized in that, The control valve is installed vertically, and the valve plate assembly is slidably connected to the valve body in the vertical direction.

3. The ventilator as described in claim 1, characterized in that, The cylinder has a damping hole, which connects the air chamber and the outlet.

4. The ventilator as described in claim 1, characterized in that, The cylinder is made of any one of the following materials: metal, glass, ceramic, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone, and graphite; or the inner wall of the cylinder is provided with one of the following layers: metal layer, glass layer, ceramic layer, polytetrafluoroethylene layer, polyoxymethylene layer, polyetheretherketone layer, and graphite layer; and / or, The piston core is made of any one of the following materials: metal, glass, ceramic, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone, and graphite; or the outer wall of the piston core is provided with one of the following layers: metal layer, glass layer, ceramic layer, polytetrafluoroethylene layer, polyoxymethylene layer, polyetheretherketone layer, and graphite layer.

5. The ventilator as described in claim 1, characterized in that, The control valve also includes a fastener mounted on the side of the valve body away from the valve seat and extending partially into the mounting hole, the fastener being used to press the cylinder.

6. The ventilator as described in claim 1, characterized in that, The control valve also includes a first sealing ring, which is sandwiched between the valve body and the cylinder, and is used for sealing between the valve body and the cylinder.

7. The ventilator as described in claim 1, characterized in that, The control valve further includes a second sealing ring, which is sandwiched between the valve seat and the valve body, and is used for sealing between the valve body and the valve seat.

8. A veterinary anesthesia breathing device, characterized in that, It includes a gas supply device, a pipeline, and a control valve. The gas supply device supplies gas to the target object through the pipeline, and the control valve is installed on the pipeline to control the flow of gas. The control valve includes a valve body and a valve plate assembly. The valve body has a flow channel, an inlet communicating with one end of the flow channel, and an outlet communicating with the other end of the flow channel. The valve plate assembly is slidably installed inside the valve body and is used to control the opening and closing of the flow channel. The valve body and the valve plate assembly enclose a gas cavity. The valve body or the valve plate assembly has a damping hole that communicates with the gas cavity and the outlet, or the damping hole communicates with the gas cavity and the outside of the control valve. The valve body includes a valve seat, a valve body, and a cylinder. The valve seat is provided with the flow channel, the valve body has an internal mounting groove, and the valve body has a mounting hole on the side away from the valve seat that communicates with the mounting groove. The cylinder is mounted in the mounting groove through the mounting hole. The cylinder has an opening on the side facing the valve seat. The valve plate assembly includes a piston core, a valve plate, and a connecting rod. The piston core is slidably embedded in the cylinder through the opening. The piston core and the cylinder enclose the air chamber. One end of the connecting rod is connected to the piston core, and the other end of the connecting rod is connected to the valve plate. The portion of the connecting rod between the piston core and the valve plate includes at least an elastic segment. The outer diameter of the elastic segment gradually decreases from the piston core toward the valve plate. The valve plate is movably connected to the piston core. The piston core includes a base plate and a side wall surrounding the base plate. The base plate has a through hole. The outer side wall of the connecting rod has a first latching part and a second latching part spaced apart from the first latching part. The connecting rod passes through the through hole. The first latching part and the second latching part are latched on opposite sides of the base plate. The first latching part is located on the side of the base plate away from the valve plate. The outer diameter of the first latching part gradually decreases in the direction away from the valve plate.

9. The veterinary anesthesia breathing device as described in claim 8, characterized in that, The control valve is installed vertically, and the valve plate assembly is slidably connected to the valve body in the vertical direction.

10. The veterinary anesthesia breathing device as described in claim 8, characterized in that, The cylinder has a damping hole, which connects the air chamber and the outlet.

11. The veterinary anesthesia breathing device as described in claim 8, characterized in that, The cylinder is made of any one of the following materials: metal, glass, ceramic, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone, and graphite; or the inner wall of the cylinder is provided with one of the following layers: metal layer, glass layer, ceramic layer, polytetrafluoroethylene layer, polyoxymethylene layer, polyetheretherketone layer, and graphite layer; and / or, The piston core is made of any one of the following materials: metal, glass, ceramic, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone, and graphite; or the outer wall of the piston core is provided with one of the following layers: metal layer, glass layer, ceramic layer, polytetrafluoroethylene layer, polyoxymethylene layer, polyetheretherketone layer, and graphite layer.

12. The veterinary anesthesia breathing device as described in claim 8, characterized in that, The control valve also includes a fastener mounted on the side of the valve body away from the valve seat and extending partially into the mounting hole, the fastener being used to press the cylinder.

13. The veterinary anesthesia breathing device as described in claim 8, characterized in that, The control valve also includes a first sealing ring, which is sandwiched between the valve body and the cylinder, and is used for sealing between the valve body and the cylinder.

14. The veterinary anesthesia breathing device as described in claim 8, characterized in that, The control valve further includes a second sealing ring, which is sandwiched between the valve seat and the valve body, and is used for sealing between the valve body and the valve seat.

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