Auxiliary pressurizing device and gas storage oxygen bottle

Abstract

The utility model relates to an auxiliary pressurizing device and a gas storage oxygen bottle, the auxiliary pressurizing device comprises a gas extraction assembly and a switching valve assembly, the switching valve assembly comprises a first gas inlet, a second gas inlet, a first gas outlet and a second gas outlet, the first gas inlet is used for being connected with an external gas supply part, and the second gas inlet is connected with the gas outlet end of the gas extraction assembly; the first air outlet is connected with an external air using piece, and the second air outlet is connected with the air inlet end of the air exhaust assembly. When the air pressure in the air storage oxygen bottle does not reach the preset pressure, the switching valve assembly is switched to the second state, the first air inlet is communicated with the second air outlet through the switching valve assembly, the second air inlet is communicated with the first air outlet, and residual oxygen in the air storage oxygen bottle is pumped out through the air pumping assembly; therefore, the residual oxygen is filled into the connected portable oxygen bottle, and the problem that when the air pressure in the air storage oxygen bottle is smaller than the preset pressure, the residual oxygen cannot be completely discharged, and waste is caused is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical auxiliary tools, in particular to an auxiliary pressurizing device and a gas storage oxygen cylinder. BACKGROUND

[0002] The content of this part only provides background information related to the present application, which may not constitute prior art.

[0003] When going out for emergency treatment, an ambulance needs to take a portable oxygen cylinder or oxygen bag outside the vehicle, and before use, the oxygen cylinder needs to be filled with oxygen into the oxygen receiving device such as a portable oxygen cylinder or an oxygen bag, and the gas pressure in the gas storage oxygen cylinder needs to be maintained at a certain pressure. When the oxygen capacity in the gas storage oxygen cylinder decreases to a certain capacity, the gas pressure in the gas storage oxygen cylinder will decrease. When the gas pressure in the gas storage oxygen cylinder is less than or equal to the required inflation pressure value in the portable oxygen cylinder or the oxygen bag, the remaining oxygen in the gas storage oxygen cylinder cannot be filled into the portable oxygen cylinder or the oxygen bag. Thus, the remaining oxygen in the gas storage oxygen cylinder cannot be effectively used, resulting in waste. SUMMARY

[0004] The purpose of the present application is to provide an auxiliary pressurizing device and a gas storage oxygen cylinder to solve the problem that when the oxygen in the gas storage oxygen cylinder decreases and the gas pressure in the gas storage oxygen cylinder is less than the preset pressure, the remaining oxygen in the gas storage oxygen cylinder cannot be completely filled into the portable oxygen cylinder or the oxygen bag, resulting in waste.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] An auxiliary pressurizing device, comprising: an air extraction assembly, the air extraction assembly comprising an air inlet end and an air outlet end, for conveying gas from the air inlet end to the air outlet end; a switching valve assembly, the switching valve assembly comprising a first air inlet, a second air inlet, a first air outlet and a second air outlet, the first air inlet being used for connecting with an external gas supply, the second air inlet being connected with the air outlet end of the air extraction assembly, the first air outlet being connected with an external gas user, and the second air outlet being connected with the air inlet end of the air extraction assembly;

[0007] When the switching valve assembly is switched to a first state, the first air inlet and the first air outlet are in communication; when the switching valve assembly is switched to a second state, the first air inlet and the second air outlet are in communication, and the second air inlet and the first air outlet are in communication, so as to convey the gas of the external gas supply to the external gas user through the air extraction assembly.

[0008] In some embodiments, the switching valve assembly comprises a valve cylinder and a valve body, the valve cylinder is provided with a switching cavity, the first gas inlet, the second gas inlet, the first gas outlet and the second gas outlet are arranged on the valve cylinder and communicate with the switching cavity, and the valve body is arranged in the switching cavity and is rotatable.

[0009] When the valve body is rotated to the first position, the two end air holes of the first gas channel communicate with the first gas inlet and the first gas outlet respectively, and the two end air holes of the second gas channel communicate with the second gas inlet and the second gas outlet respectively.

[0010] When the valve body is rotated to the second position, the two end air holes of the first gas channel communicate with the second gas inlet and the first gas outlet respectively, and the two end air holes of the second gas channel communicate with the first gas inlet and the second gas outlet respectively.

[0011] In some embodiments, the first gas inlet, the second gas inlet, the first gas outlet and the second gas outlet are uniformly spaced circumferentially on the side wall of the valve cylinder.

[0012] The axes of the two end air holes of the first gas channel are perpendicular to each other and pass through the center of the valve body, and the axes of the two end air holes of the second gas channel are perpendicular to each other and pass through the center of the valve body, so that the two end air holes of the first gas channel and the two end air holes of the second gas channel are uniformly spaced circumferentially on the side wall of the valve body.

[0013] In some embodiments, the switching valve assembly further comprises a limiting assembly, the limiting assembly comprises:

[0014] A sliding groove is arranged on the side wall of the valve body, and the axis direction of the sliding groove is perpendicular to the axis direction of the valve body;

[0015] A limiting block is arranged in the sliding groove and is slidable along the depth direction of the sliding groove, and one end of the limiting block extending out of the sliding groove is provided in a spherical shape;

[0016] An elastic member is arranged in the sliding groove and is used to drive the limiting block to slide outward;

[0017] A limiting groove is arranged on the inner wall of the switching cavity.

[0018] In some embodiments, the limiting groove is provided with a plurality of limiting grooves, the plurality of limiting grooves are arranged on the inner wall of the switching cavity and are spaced circumferentially, and the rotation angle of the limiting block between two adjacent limiting grooves is the same as the rotation angle of the valve body between the first position and the second position.

[0019] In some embodiments, four limiting grooves are provided, and the four limiting grooves are uniformly distributed in the circumferential direction.

[0020] In some embodiments, the air extraction assembly comprises a cylinder and a piston rod, one end of the piston rod is provided with a piston inside the cylinder, the piston rod is slidingly arranged in the cylinder, a first one-way valve is mounted on the piston, and a second one-way valve is arranged at the gas outlet end of the cylinder.

[0021] Further, the piston divides the inner cavity of the cylinder into an air inlet cavity and an air outlet cavity, the first one-way valve is arranged in a direction that allows gas to enter the air outlet cavity from the air inlet cavity but not vice versa, and the second one-way valve is arranged in a direction that allows gas to be discharged from the gas outlet end of the cylinder but not vice versa.

[0022] Still further, a third one-way valve is arranged at the air inlet end of the cylinder, and the third one-way valve is arranged in a direction that allows gas to be sucked into the cylinder from the air inlet end of the cylinder but not vice versa.

[0023] The second aspect of the application provides a gas storage oxygen cylinder, comprising a cylinder body and the auxiliary pressurizing device described above, and the gas outlet end of the cylinder body is connected with the first air inlet.

[0024] The technical scheme of the embodiment of the application has at least the following advantages and beneficial effects:

[0025] When the gas storage oxygen cylinder is used as an external gas supply part of the auxiliary pressurizing device of the application, and the portable oxygen cylinder is used as an external gas part of the application, the gas hole of the gas storage oxygen cylinder is in communication with the first air inlet, and the gas hole of the portable oxygen cylinder is in communication with the first gas outlet. Oxygen enters the switching valve assembly from the first air inlet. When the gas pressure in the gas storage oxygen cylinder reaches or is greater than the preset pressure, the switching valve assembly is switched to the first state, the first gas outlet and the first air inlet are connected through the switching valve assembly, and the gas storage oxygen cylinder charges the oxygen to the oxygen receiving device connected to the first gas outlet through its own pressure. When the gas pressure in the gas storage oxygen cylinder does not reach the preset pressure, the switching valve assembly is switched to the second state, the first air inlet and the second gas outlet are connected through the switching valve assembly, the second air inlet and the first gas outlet are connected, and the remaining oxygen in the gas storage oxygen cylinder is extracted through the air extraction assembly. The remaining oxygen is transported from the first air inlet to the portable oxygen cylinder through the second gas outlet, then the air extraction assembly, and then the second air inlet and the first gas outlet, so as to charge the remaining oxygen into the connected portable oxygen cylinder. This solves the problem that when the gas pressure in the gas storage oxygen cylinder is less than the preset pressure, the remaining oxygen in the cylinder cannot be completely discharged, causing waste. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1The utility model provides an auxiliary pressurizing device and the whole structure schematic diagram of gas storage oxygen cylinder.

[0027] Figure 2 The structure schematic view of the switching valve assembly is provided for an embodiment of the utility model.

[0028] Figure 3 The sectional view of the switching valve assembly is provided for an embodiment of the utility model.

[0029] Figure 4 For Figure 3 The local enlarged view of A in the middle.

[0030] Figure 5 The sectional view of the air extraction assembly is provided for an embodiment of the utility model.

[0031] Icon: 1, air extraction assembly;11, cylinder body;12, piston rod;13, piston;14, first one-way valve;15, second one-way valve;16, third one-way valve;2, switching valve assembly;21, valve cylinder;211, first air inlet;212, second air inlet;213, first air outlet;214, second air outlet;22, valve body;221, first air passage;222, second air passage;23, switching cavity;24, limiting assembly;241, sliding groove;242, limiting block;243, elastic piece;244, limiting groove;3, bottle body. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the application more clear, the technical scheme of the application will be described clearly and completely in combination with specific implementation manners. Same reference signs in the drawings represent same parts. It should be explained that the described embodiments are part of the embodiments of the application, not all the embodiments. Based on the described embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0033] Compared with the embodiments shown in the drawings, the feasible implementation schemes in the protection scope of the application can have fewer parts, have other parts not shown in the drawings, different parts, differently arranged parts or differently connected parts, etc. In addition, two or more parts in the drawings can be realized in a single part, or a single part shown in the drawings can be realized as multiple separate parts.

[0034] In the related art, the bottle body of the gas storage oxygen cylinder is sealed and stored using a rigid material, and due to the physical property of the gas having a large compression space, oxygen is delivered into the bottle body until the gas pressure in the bottle body reaches between 12 MPa and 15 MPa for storing oxygen; when a medical staff member fills a portable oxygen cylinder, the portable oxygen cylinder is generally required to be filled to above a preset gas pressure, and the preset pressure is usually at least 0.5 MPa.

[0035] With the use of oxygen, the gas pressure inside the gas storage oxygen cylinder decreases due to the reduction of oxygen, and when the gas pressure in the gas storage oxygen cylinder is lower than the preset pressure, the residual oxygen in the gas storage oxygen cylinder cannot provide the pressure for delivery to the portable oxygen cylinder, and the oxygen in the bottle body cannot be completely discharged to the portable oxygen cylinder. The present embodiment provides an auxiliary pressurizing device and a gas storage oxygen cylinder to assist in charging the residual oxygen in the gas storage oxygen cylinder into a portable oxygen cylinder or other external gas-consuming components.

[0036] Embodiment one

[0037] An auxiliary pressurizing device, with reference to Figure 1 , comprising a gas extraction assembly 1 and a switching valve assembly 2, wherein the gas extraction assembly 1 comprises an air inlet end and an air outlet end for delivering gas from the air inlet end to the air outlet end.

[0038] With reference to Figure 2 and Figure 3 , the switching valve assembly 2 comprises a first air inlet 211, a second air inlet 212, a first air outlet 213, and a second air outlet 214, wherein the first air inlet 211 is used to connect with an external gas supply component, such as a gas storage oxygen cylinder; the second air inlet 212 is connected with the air outlet end of the gas extraction assembly 1, the first air outlet 213 is connected with an external gas-consuming component, such as a portable oxygen cylinder, and the second air outlet 214 is connected with the air inlet end of the gas extraction assembly 1.

[0039] When the switching valve assembly 2 is switched to the first state, the first gas inlet 211 is in communication with the first gas outlet 213, at this time, the gas of the external gas supply device can be directly delivered to the external gas using device through the communicated first gas inlet 211 and the first gas outlet 213, for example, when the pressure in the gas storage oxygen cylinder is sufficient, the gas in the gas storage oxygen cylinder enters the first gas inlet 211 and is input into the portable oxygen cylinder from the first gas outlet 213 through the channel; when the pressure of the external gas supply device itself is insufficient, the switching valve assembly 2 is switched to the second state, the first gas inlet 211 is in communication with the second gas outlet 214, the second gas inlet 212 is in communication with the first gas outlet 213, the gas of the external gas supply device enters the gas suction assembly 1 through the communicated first gas inlet 211 and the second gas outlet 214, for example, when the pressure in the gas storage oxygen cylinder is insufficient, the gas in the gas storage oxygen cylinder enters the first gas inlet 211 and enters the gas suction assembly through the second gas inlet 212; then the oxygen is delivered to the external gas using device from the communicated second gas inlet 212 and the first gas outlet 213 through the gas suction assembly 1, for example, the oxygen is output to the portable oxygen cylinder through the gas outlet of the gas suction assembly after being pressurized in the gas suction assembly.

[0040] When the gas storage oxygen cylinder is used as the external gas supply device and the portable oxygen cylinder is used as the external gas using device, the gas hole of the gas storage oxygen cylinder is in communication with the first gas inlet 211, the gas hole of the portable oxygen cylinder is in communication with the first gas outlet 213, and the oxygen enters the switching valve assembly 2 from the first gas inlet 211; when the gas pressure in the gas storage oxygen cylinder reaches or is greater than the preset pressure, the switching valve assembly 2 is switched to the first state, the first gas outlet 213 and the first gas inlet 211 are connected through the switching valve assembly 2, and the gas storage oxygen cylinder charges the oxygen to the oxygen receiving device connected to the first gas outlet 213 through its own pressure; when the gas pressure in the gas storage oxygen cylinder does not reach the preset pressure, the switching valve assembly 2 is switched to the second state, the first gas inlet 211 is in communication with the second gas outlet 214 through the switching valve assembly 2, the second gas inlet 212 is in communication with the first gas outlet 213, the remaining oxygen in the gas storage oxygen cylinder is extracted through the gas suction assembly 1, the oxygen enters the gas suction assembly 1 from the first gas inlet 211 through the second gas outlet 214, and then is delivered to the portable oxygen cylinder from the second gas inlet 212 through the first gas outlet 213 after being pressurized by the gas suction assembly 1, so that the remaining oxygen is charged into the connected portable oxygen cylinder, solving the problem that the remaining oxygen cannot be completely discharged when the gas pressure in the gas storage oxygen cylinder is less than the preset pressure, causing waste.

[0041] In some embodiments, the switching valve assembly 2 comprises a valve cylinder 21 and a valve body 22, the valve cylinder 21 is provided with a switching cavity 23, the first gas inlet 211, the second gas inlet 212, the first gas outlet 213 and the second gas outlet 214 are all provided on the valve cylinder 21 and are all in communication with the switching cavity 23, wherein the first gas inlet 211, the second gas inlet 212, the first gas outlet 213 and the second gas outlet 214 are all provided on the valve cylinder 21 in a direction perpendicular to the axis direction of the switching cavity 23, and the axes of the first gas inlet 211, the second gas inlet 212, the first gas outlet 213 and the second gas outlet 214 are located on the same horizontal plane.

[0042] With reference to Figure 2 , the switching cavity 23 is a cylindrical cavity, the valve body 22 is a cylindrical valve piece with the same cross section as the switching cavity 23, the valve body 22 is coaxially arranged with the switching cavity 23, the valve body 22 is adapted to the switching cavity 23, the valve body 22 is rotationally arranged in the switching cavity 23, the valve cylinder 21 is provided with a mounting hole coaxial with the switching cavity 23, the valve body 22 is provided with a connecting rod and a handle, the connecting rod connects the valve body 22 and the handle through the mounting hole, so that the valve body 22 can be rotated by the handle.

[0043] In some embodiments, a sealing ring is arranged in the mounting hole, and the connecting rod is rotationally arranged in the sealing ring, so as to ensure the air tightness of the switching cavity 23.

[0044] In some embodiments, with reference to Figure 2 and Figure 3 , the valve body 22 is provided with a first gas channel 221 and a second gas channel 222, the two end gas holes of the first gas channel 221 and the two end gas holes of the second gas channel 222 are located on the outer wall of the valve body 22, when the valve body 22 is rotated to the first position, the switching valve assembly 2 is switched to the first state, the two end gas holes of the first gas channel 221 are in communication with the first gas inlet 211 and the first gas outlet 213 respectively, the two end gas holes of the second gas channel 222 are in communication with the second gas inlet 212 and the second gas outlet 214 respectively, and oxygen enters the portable oxygen cylinder through the first gas channel 221 from the gas storage oxygen cylinder; when the valve body 22 is rotated to the second position, the switching valve assembly 2 is switched to the second state, the two end gas holes of the first gas channel 221 are in communication with the second gas inlet 212 and the first gas outlet 213 respectively, the two end gas holes of the second gas channel 222 are in communication with the first gas inlet 211 and the second gas outlet 214 respectively, and oxygen enters the gas extraction assembly 1 from the gas storage oxygen cylinder through the second gas channel 222, and then enters the portable oxygen cylinder from the gas extraction assembly 1 through the first gas channel 221 under the action of the gas extraction assembly 1, so that the normal inflation mode and the gas extraction assembly 1 pumping mode can be switched by rotating the valve body 22, without the need to replace the connection of the gas circuit, so that the operation is more convenient.

[0045] In some embodiments, the first air inlet 211, the second air inlet 212, the first air outlet 213 and the second air outlet 214 are evenly spaced on the side wall of the valve cylinder 21 in the circumferential direction, so that the first air inlet 211, the second air inlet 212, the first air outlet 213 and the second air outlet 214 are distributed in a cross shape, the first air inlet 211 and the second air inlet 212 are located on opposite sides of the valve cylinder 21, in Figure 3 which the first air inlet 211 and the second air inlet 212 are located in the horizontal direction. The first air outlet 213 and the second air outlet 214 are located on opposite sides of the valve cylinder 21, in Figure 3 which the first air outlet 213 and the second air outlet 214 are located in the vertical direction; the axes of the two end air holes of the first air passage 221 are perpendicular to each other and pass through the center of the valve body 22, and the axes of the two end air holes of the second air passage 222 are perpendicular to each other and pass through the center of the valve body 22, so that the two end air holes of the first air passage 221 and the two end air holes of the second air passage 222 are evenly spaced on the side wall of the valve body 22 in the circumferential direction, i.e. the two end air holes of the first air passage 221 and the two end air holes of the second air passage 222 are also distributed in a cross shape, the first air passage 221 and the second air passage 222 are straight-angled bent passages, and the first air passage 221 and the second air passage 222 are symmetrical with respect to a radial vertical plane of the valve body 22, when the valve body 22 is located at a certain air hole and a certain air port, there are four cases, which are:

[0046] The first is that the two end air holes of the first air passage 221 are respectively communicated with the first air inlet 211 and the first air outlet 213, and the two end air holes of the second air passage 222 are respectively communicated with the second air inlet 212 and the second air outlet 214, i.e. Figure 3 the state shown in FIG. 1;

[0047] The second is that the two end air holes of the second air passage 222 are respectively communicated with the first air inlet 211 and the first air outlet 213, and the two end air holes of the second air passage 222 are respectively communicated with the second air inlet 212 and the second air outlet 214;

[0048] The third is that the two end air holes of the first air passage 221 are respectively communicated with the second air inlet 212 and the first air outlet 213, and the two end air holes of the second air passage 222 are respectively communicated with the first air inlet 211 and the second air outlet 214;

[0049] The fourth is that the two end air holes of the second air passage 222 are respectively communicated with the second air inlet 212 and the first air outlet 213, and the two end air holes of the first air passage 221 are respectively communicated with the first air inlet 211 and the second air outlet 214;

[0050] The first case and the second case can make oxygen from the storage oxygen cylinder directly enter the portable oxygen cylinder, i.e., the first state; the third case and the fourth case can make oxygen from the storage oxygen cylinder enter the portable oxygen cylinder through the air extraction assembly 1, i.e., the second state. Therefore, the first state and the second state can be switched by rotating the valve body 22 by 90° in any direction, without limiting the rotation direction of the valve body, so that the control process is more convenient.

[0051] In other embodiments, the first air inlet 211, the second air inlet 212, the first air outlet 213, and the second air outlet 214 can be arranged in other forms, for example, the first air passage 221 and the second air passage 222 are perpendicular to each other, the air holes at both ends of the first air passage 221 and the air holes at both ends of the second air passage 222 are also arranged in a cross shape, the first air passage 221 and the second air passage 222 are staggered, and the first air inlet 211 and the first air outlet 213 are arranged on both sides of the valve cylinder 21. The second air inlet 212 and the second air outlet 214 are arranged on both sides of the valve cylinder 21. The same effect can be achieved by rotating the valve body 22 by 90° to switch between the first state and the second state.

[0052] In some embodiments, referring to Figure 3 and Figure 4 , the switching valve assembly 2 further comprises a limiting assembly 24, which comprises a sliding groove 241, a limiting block 242, an elastic member 243, and a limiting groove 244. The sliding groove 241 is arranged on the side wall of the valve body 22, and the axis direction of the sliding groove 241 is perpendicular to the axis direction of the valve body 22. The limiting block 242 is arranged in the sliding groove 241 in the depth direction of the sliding groove 241, and the end of the limiting block 242 extending out of the sliding groove 241 is arranged in a spherical shape. The elastic member 243 is arranged in the sliding groove 241 to drive the limiting block 242 to slide outward, one end of the elastic member 243 is fixedly connected to the bottom wall of the sliding groove 241, and the other end is fixedly connected to the limiting block 242. In the embodiment, the elastic member 243 can be a spring. The limiting groove 244 is arranged on the inner wall of the switching cavity 23, and the limiting groove 244 is matched with the limiting block 242. When the valve body 22 is rotated to a preset position, the elastic member 243 drives the limiting block 242 to slide outward, so as to be clamped with the limiting groove 244, thereby limiting the rotation of the valve body 22 and improving the stability of the device.

[0053] In other embodiments, the limiting block 242 can also have other forms, for example, the two sides of the limiting block 242 are arranged in a slope or an arc shape, as long as the limiting block 242 can be driven into the sliding groove 241 by the slope when the valve body 22 is rotated.

[0054] In some preferred embodiments, the limiting grooves 244 are provided in plurality, the plurality of limiting grooves 244 are circumferentially spaced apart on the inner wall of the switching cavity 23, the rotation angle of the limiting block 242 between two adjacent limiting grooves 244 is the same as the rotation angle of the valve body 22 between the first position and the second position, when the valve body 22 rotates to the first position, the limiting block 242 is clamped with a certain limiting groove 244, so as to maintain the switching valve assembly 2 in the first state, when the valve body 22 rotates to the second position, the limiting block 242 is clamped with a certain limiting groove 244, so as to maintain the switching valve assembly 2 in the second state, thereby making the valve body 22 more stable during operation, and facilitating the operator to determine whether the valve body 22 rotates to the first position or the second position.

[0055] In some preferred embodiments, the limiting grooves 244 are provided in four, the four limiting grooves 244 are uniformly and circumferentially spaced apart, and each limiting groove 244 is used for corresponding to one of the above-mentioned situations, when the valve body 22 rotates by 90°, the limiting block 242 will be clamped with a certain limiting groove 244, thereby ensuring the stability of the valve body 22 in four situations, and facilitating the operator to determine whether the valve body 22 rotates to a certain communication state.

[0056] In some other embodiments, the sliding groove 241, the limiting block 242 and the elastic member 243 can be provided on the valve cylinder 21, that is, the sliding groove 241 is provided on the inner wall of the switching cavity 23, and the plurality of limiting grooves 244 are provided on the side wall of the valve body 22, when the valve body 22 rotates, the position of the limiting groove 244 is changed, and the above-mentioned effect can also be achieved.

[0057] In some embodiments, referring to Figure 5 , the air extraction assembly 1 comprises a cylinder body 11 and a piston rod 12, the piston rod 12 is slidingly arranged in the cylinder body 11, one end of the piston rod 12 inside the cylinder body 11 is provided with a piston 13, the piston 13 divides the inner cavity of the cylinder body 11 into an intake cavity and an exhaust cavity, as Figure 5 shown, the inner cavity space of the cylinder body 11 at the upper part of the piston 13 is the intake cavity, and the inner cavity space of the cylinder body 11 at the lower part of the piston 13 is the exhaust cavity, the piston 13 is provided with a first one-way valve 14, the intake direction of the first one-way valve 14 is that the gas can only enter the exhaust cavity from the intake cavity, cannot enter the intake cavity from the exhaust cavity, and only automatically opens when the pressure of the intake cavity is greater than the pressure of the exhaust cavity, that is, as Figure 5As shown, gas can enter the lower part of piston 13 from the upper part, but cannot enter the upper part of piston 13 from the lower part. A second one-way valve 15 is provided at the outlet end of cylinder 11. The exhaust direction of the second one-way valve 15 is such that gas can be discharged outward from the outlet end of cylinder 11, but cannot be drawn into cylinder 11 from the outlet end. It automatically opens only when the pressure in the outlet chamber is greater than the pressure in the connected portable oxygen cylinder. A third one-way valve 16 is provided at the inlet end of cylinder 11. The intake direction of the third one-way valve 16 is such that gas can be drawn into the inlet chamber of cylinder 11 from the inlet end of cylinder 11, but cannot be discharged outward from cylinder 11.

[0058] like Figure 5 As shown, during evacuation, the piston rod 12 drives the piston 13 to move downwards. The space of the intake chamber above the piston 13 increases and the pressure decreases, while the space of the outlet chamber below decreases and the pressure increases. The third one-way valve 16 opens, and the first one-way valve 14 closes. Gas enters the intake chamber above the piston 13 through the third one-way valve 16 located at the intake end of the cylinder 11.

[0059] Then, the piston rod 12 drives the piston 13 to move upward. The air intake chamber space at the top of the piston 13 decreases and the pressure increases, while the air outlet chamber space at the bottom increases and the pressure decreases. At this time, the second one-way valve 15 and the third one-way valve 16 are closed, and the first one-way valve 14 is opened. Gas enters the air outlet chamber below the piston 13 from top to bottom.

[0060] Then, the piston rod 12 drives the piston 13 to move downwards. As mentioned above, the third one-way valve 16 opens and the first one-way valve 14 closes, allowing gas to enter the intake chamber above the piston 13 through the third one-way valve 16. At the same time, the second one-way valve 15 opens, and gas is forced out through the outlet chamber below the piston 13 and enters the second intake port 212 of the switching valve assembly 2.

[0061] Furthermore, in order to pressurize the gas in the outlet chamber below the piston 13, the second one-way valve 15 is preset with an opening pressure value. That is, the second one-way valve 15 will only open when the gas in the outlet chamber is pressurized to the set pressure value by the downward piston 13, so as to ensure that the oxygen pressure input to the second air inlet 212 is sufficient.

[0062] Example 2

[0063] This application provides an oxygen storage cylinder, including a cylinder body 3 and the aforementioned auxiliary pressurization device, wherein the outlet end of the cylinder body 3 is connected to the first air inlet 211.

[0064] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. An auxiliary pressurizing device characterized by, The utility model relates to a kind of auxiliary pressurizing devices, including: Air extraction assembly (1), the air extraction assembly (1) includes intake end and outlet end, for gas is transported from intake end to outlet end by; Switching valve assembly (2), the switching valve assembly (2) includes first intake port (211), second intake port (212), first outlet port (213) and second outlet port (214), the first intake port (211) is connected with external gas supply, the second intake port (212) is connected with the outlet end of the air extraction assembly (1), the first outlet port (213) is connected with external gas user, the second outlet port (214) is connected with the intake end of the air extraction assembly (1); When the switching valve assembly (2) switches to first state, the first intake port (211) is communicated with the first outlet port (213);When the switching valve assembly (2) switches to second state, the first intake port (211) is communicated with the second outlet port (214), the second intake port (212) is communicated with the first outlet port (213), to be transported to external gas user by the air extraction assembly (1) with the gas of external gas supply.

2. An auxiliary compression device according to claim 1, characterised in that: The switching valve assembly (2) includes valve cylinder (21) and valve body (22), the switching cavity (23) is opened in the valve cylinder (21), the first intake port (211), the second intake port (212), the first outlet port (213) and the second outlet port (214) are all opened on the valve cylinder (21) and are all communicated with the switching cavity (23), the valve body (22) is rotationally arranged in the switching cavity (23), the first gas channel (221) and second gas channel (222) are opened on the valve body (22); When the valve body (22) rotates to first position, the two end air holes of the first gas channel (221) are communicated with the first intake port (211) and the first outlet port (213) respectively, the two end air holes of the second gas channel (222) are communicated with the second intake port (212) and the second outlet port (214) respectively; When the valve body (22) rotates to second position, the two end air holes of the first gas channel (221) are communicated with the second intake port (212) and the first outlet port (213) respectively, the two end air holes of the second gas channel (222) are communicated with the first intake port (211) and the second outlet port (214) respectively.

3. The auxiliary pressurizing device according to claim 2, wherein: The first intake port (211), second intake port (212), first outlet port (213) and the second outlet port (214) are evenly spaced circumferentially on the side wall of the valve cylinder (21). The axes of the air holes at the two ends of the first air passage (221) are perpendicular to each other and pass through the center of the valve body (22), and the axes of the air holes at the two ends of the second air passage (222) are perpendicular to each other and pass through the center of the valve body (22), so that the air holes at the two ends of the first air passage (221) and the air holes at the two ends of the second air passage (222) are uniformly spaced circumferentially on the side wall of the valve body (22).

4. An auxiliary compression device according to claim 3, wherein: The switching valve assembly (2) further comprises a limiting assembly (24), and the limiting assembly (24) comprises: a sliding groove (241) is formed in the side wall of the valve body (22), and the axis direction of the sliding groove (241) is perpendicular to the axis direction of the valve body (22); a limiting block (242) is slidably arranged in the sliding groove (241) along the depth direction of the sliding groove (241), and one end of the limiting block (242) extending out of the sliding groove (241) is provided in a spherical shape; an elastic member (243) is arranged in the sliding groove (241) to drive the limiting block (242) to slide outward; a limiting groove (244) is formed in the inner wall of the switching cavity (23).

5. An auxiliary pressurizing device according to claim 4, characterized in that: The limiting groove (244) is provided with a plurality of limiting grooves (244) which are circumferentially spaced apart on the inner wall of the switching cavity (23), and the rotation angle of the limiting block (242) between adjacent two limiting grooves (244) is the same as the rotation angle of the valve body (22) between the first position and the second position.

6. An auxiliary pressurizing device according to claim 5, characterized in that: The limiting groove (244) is provided with four limiting grooves (244) which are uniformly and circumferentially spaced apart.

7. An auxiliary compression device according to claim 1, wherein: The air extraction assembly (1) comprises a cylinder body (11) and a piston rod (12), the piston rod (12) is slidably arranged in the cylinder body (11), one end of the piston rod (12) located in the cylinder body (11) is provided with a piston (13), the piston (13) is provided with a first one-way valve (14), and the other end of the cylinder body (11) is provided with a second one-way valve (15).

8. An auxiliary pressurizing device according to claim 7, characterized in that: The piston (13) divides the inner cavity of the cylinder body (11) into an air inlet cavity and an air outlet cavity, the direction of the first one-way valve (14) is that the gas can only enter the air outlet cavity from the air inlet cavity and cannot enter the air inlet cavity from the air outlet cavity; the direction of the second one-way valve (15) is that the gas can only be discharged outward from the air outlet end of the cylinder body (11) and cannot be sucked into the cylinder body (11) from the air outlet end of the cylinder body (11).

9. An auxiliary pressurizing device according to claim 8, characterized in that: A third one-way valve (16) is arranged at the air inlet end of the cylinder body (11), and the direction of the third one-way valve (16) is that the gas can only be sucked into the cylinder body (11) from the air inlet end of the cylinder body (11) and cannot be discharged outward from the cylinder body (11).

10. A gas storage oxygen cylinder comprising a cylinder body (3), characterised in that, The bottle body (3) is connected with the first air inlet (211).

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