Gas circuit switching valve with travel switch

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a gas circuit switching valve with a travel switch, which comprises a knob, a connecting plate, a sliding block, a valve body and the travel switch, the knob and the valve body are connected together through a connecting plate, a sliding block is arranged between the knob and the valve body, one side of the sliding block is in contact with a knob movable shaft, the other side of the sliding block is in contact with a valve body protruding shaft, an ejector rod is further arranged on the sliding block, and the ejector rod is connected with a travel switch; and the travel switch is arranged on the valve body. The gas circuit switching valve is compact in overall design structure, small in installation space requirement and reliable in reversing function for a long time.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a gas path switching valve with a travel switch. Background Art

[0002] The gas circuit switching valve is one of the commonly used control components for gas circuit control of medical equipment, including solenoid valves and mechanical valves, which are generally 1-in 2-out (1 air inlet, 2 air outlets) structures, and rarely 2-in 1-out (2 air inlets, 1 air outlet) structures. The solenoid valve switches the gas circuit by controlling the movement of the valve core in the valve body through power-on, while the mechanical valve switches the gas circuit by manually operating (usually using hands or feet) knobs (buttons) or pull-press rods to control the movement of the valve core in the valve body.

[0003] The solenoid valve needs to be powered to work. Once the circuit system or control system has problems, the solenoid valve will fail and cannot meet the function of manual intervention to switch the gas circuit under special circumstances (sudden power failure). Mechanical valves usually only have mechanical reversing functions and do not have the function of displaying the valve core switching position. Whether the gas circuit switching is completed can only be judged manually, and it cannot form interlocking control or information display with other components. Utility Model Content

[0004] The utility model aims to provide a gas circuit switching valve with a travel switch. The gas circuit switching valve has a compact overall design structure, requires less installation space, and has a long-term reliable switching function.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A gas circuit switching valve with a travel switch, the gas circuit switching valve comprising a knob, a connecting plate, a sliding block, a valve body and a travel switch;

[0007] The knob and the valve body are connected together through a connecting plate, and a sliding block is arranged between the knob and the valve body. One side of the sliding block contacts the movable shaft of the knob, and the other side contacts the protruding shaft of the valve body. A push rod is also arranged on the sliding block, and the push rod is connected to a travel switch; the travel switch is arranged on the valve body.

[0008] A knob movable shaft installation groove is arranged on one side of the sliding block, and a valve body protruding shaft installation groove is arranged on the other side; the knob movable shaft contacts the sliding block in the knob movable installation groove, and the valve body protruding shaft contacts the sliding block in the valve body protruding shaft installation groove.

[0009] A push rod mounting hole is arranged on the sliding block, a push rod is arranged in the push rod mounting hole, and the push rod opens or closes the travel switch along with the movement of the sliding block.

[0010] The sliding block is provided with a through hole, a guide column is provided in the through hole, and the guide column is fixed on the valve body.

[0011] A mounting plate is arranged on the valve body, and the travel switch is mounted on the mounting plate.

[0012] The travel switch is arranged on any side surface of the valve body.

[0013] The gas circuit switching valve is provided with an NC air inlet connector, a NO air inlet connector and an air outlet connector, and the gas circuit is switched by the displacement of the movable shaft and the return spring in the valve body. The movable shaft drives the valve core to move.

[0014] The gas circuit switching valve of the utility model is a 2-input 1-output gas circuit structure, which is improved on the basis of the existing mechanical valve, and realizes manual switching of the gas circuit and connecting the travel switch sensor, and can output electrical signals to the upper computer for the upper computer to display the gas circuit reversal, switch the program function, or execute other gas circuit components. At the same time, in the case of sudden power failure, it is still guaranteed that the gas circuit can be switched to meet the special use requirements of the anesthesia machine.

[0015] Functions of the gas path switching valve of the utility model:

[0016] (1) The 2-inlet and 1-outlet gas circuit structure is different from the common gas circuit control valves on the market, which solves the problem of switching the air inlet source under special circumstances; a mechanical valve is equipped with a travel switch to realize the manual mechanical valve to generate a gas circuit switching in-position signal output function; the valve body adopts a mechanical valve body to retain the integrity of the original valve body module, so that the gas circuit switching valve of the utility model has reliable movement performance and a long service life;

[0017] (2) Manual valve can ensure the gas path switching in case of power failure;

[0018] (3) Equipped with a travel switch, which can output an electrical signal when switched into place;

[0019] (4) In addition to satisfying the gas circuit switching of two gas sources with the same pressure in medical equipment, it can also be used for forced gas circuit switching when low-pressure gas source and high-pressure gas source are used alternately;

[0020] (5) There are more than 4 travel switch installation positions, and the installation position can be determined according to the actual needs of the equipment. It can be installed on both sides of the valve body to meet different installation requirements.

[0021] The utility model integrates the functions of a mechanical valve and a solenoid valve of a gas circuit component, and innovates the function of adding an electrical signal output to the mechanical valve, thereby broadening the application scenarios of the mechanical valve. Under the premise of ensuring manual control of the mechanical valve, the control linkage or display of other devices or components can be realized through the action of the mechanical valve, such as: displaying the gas circuit switching operation on the screen, and switching the internal control program and preset parameters accordingly when switching the gas circuit.

[0022] The sliding block of the utility model utilizes the movable shaft and reset spring in the original valve body to move and reset, and no additional reset spring is required. The sliding block has a symmetrical structure, and the top rod can be installed on both sides. Combined with the different installation positions of the travel switch, it can meet the multi-directional installation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural diagram of the gas path switching valve of the utility model;

[0024] Figure 2 yes Figure 1 A front view of

[0025] Figure 3 yes Figure 1 A top view of

[0026] Figure 4 It is a cross-sectional view of the gas path switching valve of the utility model;

[0027] Figure 5 This is the installation position diagram of the travel switch of the utility model;

[0028] Figure 6 This is the installation position diagram of the travel switch of the utility model;

[0029] Figure 7 It is a three-dimensional structural diagram of the sliding block of the utility model;

[0030] Figure 8 It is a front view of the sliding block of the utility model;

[0031] Fig. 9 It is a rear view of the sliding block of the utility model;

[0032] Fig.10 It is a side sectional view of the sliding block of the utility model;

[0033] Reference numerals:

[0034] 1. Knob; 2. Sliding block; 3. Push rod; 4. NC air inlet connector; 5. NO air inlet connector; 6. Air outlet connector; 7. Valve body; 8. Mounting plate; 9. Travel switch; 10. Screw 1; 11. Connecting plate; 12. Guide column; 13. Screw 2; 14. Screw 3; 15. Knob movable shaft; 16. Valve body protruding shaft; 17. Knob movable shaft mounting slot; 18. Valve body protruding shaft mounting slot; 19. Push rod mounting hole. DETAILED DESCRIPTION

[0035] The technical solution of the utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0036] Example 1

[0037] like Figure 1-4 As shown, a gas circuit switching valve with a travel switch includes a knob 1, a sliding block 2, a push rod 3, an NC air inlet connector 4, an NO air inlet connector 5, an air outlet connector 6, a valve body 7, a mounting plate 8, a travel switch 9, a screw 10, a connecting plate 11, a guide column 12, a screw 2 13 and a screw 3 14.

[0038] The knob 1 and the valve body 7 adopt the knob and valve body components of the mechanical valve, and the knob 1 and the valve body 7 are connected together by the connecting plate 11 and the screw 10. A guide column 12 is installed inside, and a push rod 3 is installed on one side of the guide column 12. A travel switch 9 is installed on the same side of the valve body 7, and it is locked on the mounting plate 8 by screw three 14. The mounting plate 8 is locked on the valve body 7 by screw two 13. The NC air inlet connector 4, the NO air inlet connector 5 and the air outlet connector 6 are respectively installed at the corresponding hole positions of the valve body 7 by G1 / 8 threads; a sliding block 2 is arranged between the knob 1 and the valve body 7, one side of the sliding block 2 contacts the knob movable shaft 15, and the other side contacts the valve body protruding shaft 16, and a push rod 3 is also arranged on the sliding block 2, and the push rod 3 is connected to the travel switch 9; the travel switch 9 is arranged on the valve body 7.

[0039] like Figure 7-10 A knob movable shaft mounting groove 17 is provided on one side of the sliding block 2, and a valve body protruding shaft mounting groove 18 is provided on the other side; the knob movable shaft 15 contacts the sliding block 2 in the knob movable mounting groove 17, and the valve body protruding shaft 16 contacts the sliding block 2 in the valve body protruding shaft mounting groove 18.

[0040] The sliding block 2 is provided with a push rod mounting hole 19, in which a push rod 3 is arranged, and the push rod 3 opens or closes the travel switch 9 as the sliding block 2 moves. The sliding block 2 can be symmetrically structured, and push rod mounting holes 19 can be arranged on both sides of the left and right sides, so that the travel switch can be installed on both sides of the valve body 7. Figure 5-6 As shown, it has four installation positions, namely the first installation position, the second installation position, the third installation position and the fourth installation position. At these four installation positions, one or more positions can be selected to simultaneously install the travel switch to form different electrical signals.

[0041] The sliding block 2 is provided with a through hole, in which a guide column 12 is provided, and the guide column 12 is fixed on the valve body 7. The sliding block can move along the guide column 12.

[0042] A mounting plate 8 is provided on the valve body 7 , and a travel switch 9 is mounted on the mounting plate 8 .

[0043] Action sequence of the gas circuit switching valve:

[0044] In the initial state, the knob movable shaft 15 is in the left position, the first air source enters the valve body 7 from the NO air inlet connector 5 and flows out from the air outlet connector 6, and the air path of the NC air inlet connector 4 is in a cut-off state and is not ventilated.

[0045] When the knob 1 is rotated to the right, the knob movable shaft 15 squeezes the inner end face of the mounting groove on the left side of the sliding block 2. The sliding block 2 moves to the right under the guidance of the guide column 12 to push the valve body protruding shaft 16 on the valve body 7. The valve core inside the valve body 7 moves to the right into place driven by the movable shaft. At this time, the air path of the NO air inlet connector 5 is cut off, and the air path of the NC air inlet connector 4 is connected. The gas from the second air source enters the valve body 7 through the NC air inlet connector 4 and flows out from the air outlet connector 6, thereby realizing the air path switching between the first air source and the second air source.

[0046] At the same time, the sliding block 2 drives the push rod 3 thereon to move to the right, squeezing the contact of the travel switch 9, and the travel switch 9 turns on the internal circuit and outputs an electrical signal.

[0047] When it is necessary to switch back to the first gas source, the knob 1 is rotated to the left, the knob movable shaft 15 is retracted, and the valve body protruding shaft 16 on the valve body 7 is popped out under the action of its internal return spring, pushing the sliding block 2 to move to the left. At this time, the NC air inlet connector 4 is cut off, and the NO air inlet connector 5 is connected, realizing the air path switching.

[0048] Any content not described in detail in the present invention can be based on the conventional technical knowledge in the field.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the embodiments, a person skilled in the art should understand that any modification or equivalent replacement of the technical solution of the utility model does not deviate from the spirit and scope of the technical solution of the utility model, and should be included in the scope of the claims of the utility model.

Claims

1. A gas circuit switching valve with a travel switch, characterized in that: The gas path switching valve comprises a knob, a connecting plate, a sliding block, a valve body and a travel switch; The knob and the valve body are connected together through a connecting plate, and a sliding block is arranged between the knob and the valve body. One side of the sliding block contacts the movable shaft of the knob, and the other side contacts the protruding shaft of the valve body. A push rod is also arranged on the sliding block, and the push rod is connected to a travel switch; the travel switch is arranged on the valve body.

2. The gas circuit switching valve with a travel switch according to claim 1, characterized in that: A knob movable shaft installation groove is arranged on one side of the sliding block, and a valve body protruding shaft installation groove is arranged on the other side; the knob movable shaft contacts the sliding block in the knob movable installation groove, and the valve body protruding shaft contacts the sliding block in the valve body protruding shaft installation groove.

3. The gas circuit switching valve with a travel switch according to claim 1, characterized in that: A push rod mounting hole is arranged on the sliding block, a push rod is arranged in the push rod mounting hole, and the push rod opens or closes the travel switch along with the movement of the sliding block.

4. The gas circuit switching valve with a travel switch according to claim 1, characterized in that: The sliding block is provided with a through hole, a guide column is provided in the through hole, and the guide column is fixed on the valve body.

5. The gas circuit switching valve with a travel switch according to claim 1, characterized in that: A mounting plate is arranged on the valve body, and the travel switch is mounted on the mounting plate.

6. The gas circuit switching valve with a travel switch according to claim 1, characterized in that: The travel switch is arranged on any side surface of the valve body.

7. The gas circuit switching valve with a travel switch according to claim 1, characterized in that: The gas circuit switching valve is provided with an NC air inlet joint, a NO air inlet joint and an air outlet joint, and the gas circuit is switched by the displacement of the movable shaft and the return spring in the valve body.

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