An inflation terminal device and inflation system

Abstract

The application provides an inflating terminal device, which comprises an inflating head, a pressure reducing valve assembly and a connecting part. The inflating head is arranged at the air outlet end of the pressure reducing valve assembly. One end of the connecting part is provided with a cavity, and the pressure reducing valve assembly is sealingly arranged in the cavity. The other end of the connecting part is connected with an external gas source. An air channel is arranged between the two ends of the connecting part. A pressure detecting device communicating with the air channel is arranged on the connecting part close to the external gas source. The application further discloses an inflating system, which comprises the inflating terminal device and at least one external gas source. The external gas source is connected with the inflating terminal device through an air pipe. The inflating device can further reduce the pressure before the gas enters the inflating object, keep the pressure of the terminal air outlet stable, understand the inflating completion condition through the pressure detecting device, monitor whether the input gas pressure is in the normal working range, and select the required gas source to perform the inflating task through the switching mode of multiple gas sources in the inflating system.

Description

Technical Field

[0001] This invention belongs to the technical field of inflation, and specifically relates to an inflation terminal device and an inflation system. Background Technology

[0002] In daily life, items requiring special preservation, such as food, medicine, and cultural relics, which are difficult to store for extended periods in air, are often stored using vacuuming or filling with inert gases. For bottled beverages, such as wine or sparkling wine, the taste can be affected if not consumed promptly after opening. Currently, there are methods on the market that involve injecting gases that do not react with the liquid inside the bottle for storage or retrieval. These include handheld gas filling devices and external gas cylinder filling methods. Handheld gas filling devices are limited by the size of the gas cylinder and cannot meet frequent usage needs. External gas cylinder filling methods typically involve connecting a pressure reducing valve at the cylinder opening to a gas inflator via a hose. During use, there is a risk of the pressure reducing valve malfunctioning or excessive pressure causing excessive gas pressure entering the bottle through the inflator, potentially leading to bottle explosion or the cork being ejected. Furthermore, users cannot determine whether filling is complete. Summary of the Invention

[0003] In order to solve the above-mentioned problems in the prior art, this application provides an inflation terminal device and an inflation system to solve the above-mentioned technical defects.

[0004] According to a first aspect of the present invention, an inflation terminal device is provided, comprising: an inflation head, a pressure reducing valve assembly, and a connecting portion. The inflation head is disposed at the outlet end of the pressure reducing valve assembly. One end of the connecting portion is provided with a cavity, in which the pressure reducing valve assembly is sealed. The other end of the connecting portion is connected to an external air source. An air passage is provided between the two ends of the connecting portion, and a pressure detection device communicating with the air passage is provided on the connecting portion near the external air source. This inflation terminal device can re-depressurize the pressure through the pressure reducing valve assembly on the device when gas from the external air source enters the part to be inflated, avoiding excessive pressure. Simultaneously, the pressure detection device can determine whether the inflation process is complete, improving inflation safety and facilitating user inflation operations.

[0005] In some specific embodiments, the inflation head is a trigger switch structure, including a valve core and a switch body. The valve core is disposed in a cavity inside the switch body, and the air intake channel of the cavity opens when the valve core is pressed against the part to be inflated, and closes when the valve core moves away from the part to be inflated. This structure simplifies the inflation process, eliminating the need for additional control of opening the air intake channel.

[0006] In some specific embodiments, the pressure reducing valve assembly includes a pressure reducing valve and a control valve. The pressure reducing valve includes a pressure reducing valve body, a piston seat, a piston, and a spring. The pressure reducing valve body is sealed to the cavity of the connecting part. The piston seat and piston are fitted together in the cavity inside the pressure reducing valve body. The spring is sleeved between the piston and the piston seat. The control valve is located at the bottom of the pressure reducing valve. This pressure reducing valve assembly and control valve configuration ensures a stable and reliable output of gas entering the component to be inflated through the inflation head.

[0007] In some specific embodiments, the pressure reducing valve body and connecting portion are provided with a pressure relief port communicating with the outside. When the piston is subjected to pressure exceeding a predetermined limit, the lower end face of the piston can exceed the height of the pressure relief port. This feature can prevent dangerous situations that may occur when the external air source enters the device at excessively high pressure, and the excessively pressurized gas can be discharged to the outside in a timely manner through the pressure relief port.

[0008] In some specific embodiments, a pressure adjusting knob is provided on the upper part of the piston seat. When the pressure adjusting knob is rotated, the piston seat moves along its axial direction to adjust the compression stroke of the spring. This structural design allows users to easily adjust the output gas pressure and improves the performance of the inflation equipment.

[0009] In some specific embodiments, a housing is also included, comprising two connectable housing structures. The pressure reducing valve assembly and the connecting portion are fixedly disposed within the internal cavity formed by the two connectable housing structures. Furthermore, the connecting portion and the interior of the housing are respectively provided with limiting grooves and corresponding limiting protrusions. This structural design improves the stability of the internal structure.

[0010] In some specific embodiments, one end of the connector is connected to an external air source via an air tube, and a spring harness or protective sleeve is provided outside the air tube at one end of the connector. This structure can prevent the air tube at the bottom from bending and affecting the inflation effect.

[0011] In some specific embodiments, the pressure detection device includes a pressure gauge, with a display window on the housing corresponding to the pressure gauge. The pressure gauge is equipped with a pointer, a working area, and a warning area. This configuration allows the user to intuitively obtain the inflation status and cylinder pressure.

[0012] In some specific embodiments, the connecting part has a radially opened pressure detection hole communicating with the airway, and the detection head of the pressure gauge is sealed to the pressure detection hole. This configuration allows for accurate acquisition of the pressure within the airway.

[0013] According to a second aspect of the present invention, an inflation system is provided, comprising an inflation terminal device as described above, and at least one external air source connected to the inflation terminal device via an air pipe. This inflation system can utilize the external air source connected to the inflation device to inflate the component to be inflated.

[0014] In some specific embodiments, the external gas source includes a gas cylinder and a pilot pressure reducing valve. The pilot pressure reducing valve is located at the mouth of the gas cylinder and is connected to one end of the connector via a gas pipe. The output pressure of the pilot pressure reducing valve is greater than or equal to the outlet pressure of the filling terminal equipment. This configuration allows for preliminary pressure reduction of the high-pressure gas in the gas cylinder, preventing excessively high pressure from being output to the filling terminal equipment. Simultaneously, for the filling terminal equipment to function properly, the pressure value of the external gas source outputting gas under the action of the pilot pressure reducing valve should be greater than or equal to the outlet pressure of the filling terminal equipment.

[0015] In some specific embodiments, two different external gas sources are included. These two external gas sources are connected to the input end of a three-way valve via gas pipes, and the output end of the three-way valve is connected to the connection part of the inflation terminal equipment. With this setup, the appropriate gas cylinder can be selected for inflation according to different inflation gas requirements.

[0016] Compared with the prior art, the beneficial results of the present invention are as follows:

[0017] This application utilizes a pressure-reducing valve assembly after the inflation head to re-depressurize the gas as it enters the inflatable component from an external gas source. This prevents excessively high output gas pressure from the cylinder or excessive pressure from the cylinder's pressure-reducing valve malfunctioning or being misoperated, thus maintaining the pressure at the terminal outlet. The inclusion of a pressure relief vent further enhances safety. Additionally, a pressure detection device determines whether inflation is complete and monitors whether the input pressure is within the normal operating range, improving inflation safety and simplifying the user's inflation process. During system use, different gas cylinders can be connected via a three-way valve to meet varying inflation needs, allowing for selection of the appropriate cylinder for output and avoiding frequent disassembly of the inflation terminal equipment. Attached Figure Description

[0018] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the invention. Other embodiments and many anticipated advantages of the embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.

[0019] Figure 1 This is a schematic diagram of the structure of an inflation terminal device according to the first embodiment of the present invention;

[0020] Figures 2a-2c This is a cross-sectional view of an inflation terminal device according to a first specific embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of an inflation terminal device according to a second specific embodiment of the present invention;

[0022] Figures 4a-4b This is a cross-sectional view of an inflation terminal device according to a second specific embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the surface of a pressure gauge according to a specific embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of an inflation system according to an embodiment of the present invention.

[0025] The meanings of the numbers in the diagram are as follows: 100-Inflation head, 101-First valve core, 102-Switch body, 200-Connection part, 300-Pressure reducing valve, 301-Pressure reducing valve body, 302-Piston seat, 3021-Pressure adjusting knob, 303-Spring, 304-Piston, 310-Control valve, 311-Second valve core, 312-Valve core seal, 313-Valve core spring, 314-Switch valve seat, 400-Housing shell, 500-Pressure detection device, 600-Spring wiring harness, 700-Gas pipe, 801-Gas cylinder, 802-Pilot pressure reducing valve, 900-Three-way valve. Detailed Implementation

[0026] In the following detailed description, reference is made to the accompanying drawings, which form part of the detailed description and are illustrated by specific illustrative embodiments in which the invention may be practiced. In this regard, directional terms such as “top,” “bottom,” “left,” “right,” “up,” “down,” etc., are used with reference to the orientation of the described figures. Because components of the embodiments can be positioned in several different orientations, directional terms are used for illustrative purposes and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the invention. Therefore, the following detailed description should not be taken in a limiting sense, and the scope of the invention is defined by the appended claims.

[0027] This invention proposes an inflation terminal device. Figure 1 A schematic diagram of the structure of the inflation terminal device according to the first embodiment of the present invention is shown, as follows: Figure 1As shown, the inflation terminal device includes an inflation head 100, a housing 400, a pressure detection device 500, and an air hose 700. The inflation head 100 is located on the top of the housing 400, the pressure detection device 500 is located on the surface of the housing 400, and the air hose 700 enters the housing 400 from the bottom. A spring harness 600 is provided at the connection point to prevent the air hose from bending and to protect the air hose. The spring harness 600 can also be replaced with a protective sleeve or other air hose protection structure, as long as it meets the requirement of protecting the air hose at the connection point. The housing 400 is formed by splicing two housing structures. In this embodiment, the left and right housings are spliced ​​together and fastened with bolts, which facilitates the fixation of the internal components of the housing.

[0028] The following is combined Figure 2a and 2b The cross-sectional view of the inflation terminal device according to a first specific embodiment of the present invention is shown, and the internal structure of the inflation terminal device is described:

[0029] The inflation head 100 includes a first valve core 101 and a switch body 102. The switch body 102 has a hollow conductive cavity inside. The first valve core 101 is movably disposed in the conductive cavity inside the switch body 102. When the first valve core 101 moves in the conductive cavity, it can block the conduction of the conductive cavity. The inflation head 100 serves as both an air outlet structure and a switch for controlling the on / off state. During use, there is no need to operate the control switch separately, which simplifies the inflation operation and makes it convenient to use.

[0030] The inflation terminal device is internally equipped with a connection part 200 and a pressure reducing valve assembly. The pressure reducing valve assembly includes a pressure reducing valve 300 and a control valve 310. The pressure reducing valve 300 includes a pressure reducing valve body 301, a piston seat 302, a spring 303, and a piston 304. The pressure reducing valve body 301 has a cavity inside. Both the piston seat 302 and the piston 304 are T-shaped structures. The head of the piston seat 302 is fixed to the opening of the cavity by a threaded fastening fit. The lower part of the piston seat 302 is provided with a through hole to accommodate the lower part of the piston 304. The piston 304 is inverted, with its head located at the bottom of the cavity and its lower part inserted into the lower through hole of the piston seat 302 and sealingly fitted therewith. The spring 303 is located in the cavity area between the head of the piston seat 302 and the head of the piston 304, pressing the piston 304 against the bottom of the cavity.

[0031] In a specific embodiment, the control valve 310 includes a second valve core 311, a valve core seal 312, a valve core spring 313, and a valve seat 314. The valve seat 314 is disposed at the bottom of the pressure reducing valve body 301, and has a through hole in the middle of the valve seat 314. The valve core seal 206 is disposed above the valve seat 314, and its hole diameter is smaller than the through hole in the middle of the valve seat 314. The second valve core 311 is placed inside the through hole, allowing the second valve core 311 to move within the through hole. The second valve core 311 has a cylindrical structure, and an annular protrusion is provided near the bottom of the cylindrical structure. The annular protrusion is approximately equal to the diameter of the through hole in the middle of the valve seat 314, and the annular protrusion extends to... There is at least one gap to ensure that the central through hole of the valve seat 314 is always open. A valve core spring 313 is provided at the bottom of the annular protrusion. The bottom of the valve core spring 313 abuts against the bottom surface of the internal through hole of the valve seat 312 and presses the second valve core 311 onto the valve core seal 312. The upper diameter of the cylindrical structure of the second valve core 311 is slightly smaller than that of the lower part and transitions through a conical surface. This conical surface can abut against the conical surface in the middle of the valve core seal 312 to block the opening at the bottom of the internal cavity of the pressure reducing valve body 301. The upper diameter of the cylindrical structure of the second valve core 311 is slightly smaller than that of the central through hole of the valve core seal 312, so that gas can pass through the gap between the two.

[0032] In a specific embodiment, the lower part of the piston 304 has an opening, which is connected to the head end face of the piston 304 via an oblique hole. A groove is provided on the head end face of the piston 304, and the oblique hole is located at the end face of the groove at the head outlet of the piston 304. The oblique hole is used to avoid the second valve core 311 extending from the bottom opening of the cavity, preventing the second valve core 311 from blocking the internal pipeline of the piston 304. The groove prevents the oblique hole from failing to communicate with the bottom opening of the cavity when the piston 304 is pressed to the bottom of the cavity by the spring 303, thus preventing normal gas output. The groove also helps to release residual pressure in the gas cylinder when the gas in the cylinder is about to run out and is unable to push the piston up.

[0033] In a specific embodiment, the connecting part 200 is a columnar structure, and the end of the connecting part 200 near the inflation head 100 has a larger diameter. The connecting part at this location is provided with a cavity structure for accommodating the pressure reducing valve 300. The pressure reducing valve body 310 is sealed to the cavity structure. The bottom of the cavity structure also has a conical cavity structure for accommodating the control valve 310. A pressure relief hole 201 is also provided on the cavity structure of the connecting part and the side wall of the pressure reducing valve body 310. The pressure relief hole 201 is located above the sealed joint between the pressure reducing valve body 310 and the cavity structure, and above the sealed joint between the piston 304 and the internal cavity of the pressure reducing valve body 310. When the pressure of the external air source entering the device is too high, or when the bottom control valve fails to shut off due to other reasons, causing leakage, the lower end face of the piston 304 may exceed the height of the pressure relief hole 201 under the action of pressure exceeding the predetermined pressure. The excessively high pressure gas can be discharged in time through the pressure relief hole 201 to prevent the excessively high pressure gas from rushing into the inflatable part and causing danger.

[0034] In a specific embodiment, the other end of the connecting part 200 is used to connect to the air tube 700, and the interior of the connecting part 200 has an air passage connecting both ends. The air tube 700 is connected to the bottom of the other end of the connecting part 200 through an air tube connector 701. Specifically, the connection can be achieved by a threaded connection, and a sealing structure (such as a sealing gasket or sealing ring) is also provided at the mating point. Furthermore, an air tube protection structure is provided at the bottom of the housing 400. The air tube protection structure covers and fixes the air tube connector 701 to prevent deformation at the connection point during use, which could lead to air leakage. A spring wire harness 600 is also provided, which is sleeved on the air tube protection structure and the air tube 700 to prevent the air tube at the connection point from bending during use, thus preventing it from affecting the inflation operation. Alternatively, in addition to using the above-mentioned air tube protection structure, a protective sleeve can be directly provided on the air tube at the connection point, which can also achieve the technical effect of this application.

[0035] In a specific embodiment, the housing 400 has multiple limiting protrusions inside according to the structure of the connecting part 200 and the pressure reducing valve assembly, which are used to stably fix the connecting part 200 and the pressure reducing valve inside the housing 400. Preferably, a limiting groove is also provided on the columnar surface of the connecting part 200. The connecting part 200 and the pressure reducing valve assembly are further fixed inside the housing 400 by the cooperation of the limiting protrusions and the limiting groove, so as to avoid the inflation effect being affected by the tilting or shaking of the internal components during the inflation process.

[0036] In a specific embodiment, a pressure monitoring device 500 is disposed in the area between the pressure reducing valve assembly and the air pipe connection on the connecting part 200. It is used to detect the gas pressure entering the device. Specifically, the connecting part 200 has a pressure detection hole communicating with the output air passage. The detection head of the pressure monitoring device 500 is sealed to this pressure detection hole to read the pressure value in the air passage. When the device is connected to an external air source via the air pipe 700, the pressure monitoring device 500 displays the initial pressure value output by the external air source. When the device is used with the component to be inflated, for example, when inflating sparkling wine, the air inlet channel opens and connects to the inside of the bottle the instant the inflator engages with the inflatable stopper at the bottle opening. The value of the pressure monitoring device 500 decreases instantaneously. As the inflating process is completed, the air pressure inside the bottle tends to match the pressure reducing valve pressure, at which point the pressure reducing valve closes. During this process, the value of the pressure monitoring device 500 gradually increases and stabilizes at the initial pressure value. Therefore, the pressure monitoring device 500 also provides a direct visual indication of whether inflating is complete. In addition, if the remaining pressure of the external air source is insufficient or abnormally high, it can be directly seen from the pressure monitoring device 500. At this time, the user can directly understand the abnormal situation of the external air source pressure and replace or maintain the external air source in a timely manner.

[0037] In another embodiment, the pressure monitoring device 500 can also be disposed in the area between the inflation head 100 and the pressure reducing valve assembly, as shown in Figure 2c. In this embodiment, the connection part needs to be adapted structurally. In this embodiment, the head of the piston seat of the pressure reducing valve extends to form an extension part. The interior of the extension part is the air passage output through the pressure reducing valve. The inflation head is connected to the end of the extension part. A pressure detection hole communicating with the output air passage is opened in the middle of the extension part. The detection head of the pressure monitoring device 500 is sealed and fitted with the pressure detection hole to read the pressure value in the air passage. The pressure monitoring device 500 has similar function and effect to that in the previous embodiment. It can also monitor the input and output pressure of the terminal device. The pressure monitoring device 500 is disposed before the pressure reducing valve, which means that the actual value is smaller after the pressure is reduced compared to when it is disposed after the pressure reducing valve. It can still achieve the technical effect of this application.

[0038] In a specific embodiment, the pressure monitoring device 500 can be a mechanical pointer pressure gauge or a digital pressure gauge. Taking a mechanical pointer pressure gauge as an example, Figure 5The schematic diagram of a pressure gauge according to a specific embodiment of the present invention shows that different states can be displayed on the pressure gauge, such as a green area A indicating normal operating pressure, a yellow area B indicating insufficient pressure, a low-pressure area C indicating excessively low pressure, and an overpressure warning area D indicating excessively high pressure. This allows users to intuitively understand the pressure status. Under normal conditions, when the device is connected to an external air source, the pointer is in area A, the normal operating pressure. During inflation, the pressure value drops instantly when the inflation channel is connected with the component to be inflated. As the inflation process is completed, the pressure value gradually rises, which is represented on the pressure gauge as the pointer first drops back to area B and then gradually rises back to area A, the normal operating pressure. At the same time, the pressure of the external air source can be judged by observing the pressure output of the external air source. When the external air source pressure is insufficient, for example, when the pressure gauge drops to area C, the external air source needs to be replaced in time. When the pressure gauge is in area D, it reminds the user that the external air source needs to be checked and maintained.

[0039] In the second embodiment of this application, Figure 3 A schematic diagram of the structure of an inflation terminal device according to a second embodiment of the present invention is shown, as follows: Figure 3 As shown, the handheld inflation device in this embodiment is... Figures 1-2b Based on the inflation terminal equipment, a pressure regulating function has been added, specifically through the pressure regulating knob 3021 in the pressure reducing valve 300. The specific pressure regulating principle is combined with... Figure 4a The cross-sectional view of the inflatable terminal device according to the second specific embodiment of the present invention shown in section -ab will be described as follows:

[0040] The overall pressure regulation principle of this inflation terminal device is similar to the inflation structure of the first embodiment. In this embodiment, the upper part of the piston seat 302 of the pressure reducing valve 300 is set as a pressure regulating knob 3021, and the pressure regulating knob 3021 is located on the upper exterior of the housing 400. The user can control the rotation of the piston seat 302 of the pressure reducing valve 300 by rotating the pressure regulating knob 3021, thereby controlling its vertical displacement and adjusting the compression stroke of the spring 303 inside the pressure reducing valve 300, thus achieving pressure regulation of the overall pressure reducing valve. The outer circumferential surface of the pressure regulating knob 3021 is provided with anti-slip teeth to facilitate user rotation. In other embodiments, other forms of pressure regulation can also be used, such as adjustment by means of a lever or other methods. Preferably, a limiting structure can be further provided to limit the rotation range of the pressure regulating knob to avoid the impact on use and safety hazards caused by excessive adjustment due to misoperation.

[0041] In this embodiment, by adjusting the compression stroke of the spring 303 through the pressure regulating knob 3021, the pressure of the pressure reducing valve can be adjusted, and the predetermined pressure of the pressure relief hole 201 can also be finely adjusted to meet the safety pressure threshold requirements of different inflatable components, thereby further improving safety.

[0042] Continue to refer to Figure 6 , Figure 6 A schematic diagram of an inflation system according to an embodiment of the present invention is shown, as follows: Figure 6 As shown, the inflation system includes at least one external air source, which includes a gas cylinder 801 and a pilot pressure reducing valve 802. The pilot pressure reducing valve 802 is located at the inlet of the gas cylinder 801 and is connected to the inflation terminal device via an air pipe. The inflation terminal device is used to inflate the component to be inflated. It should be noted that the output gas pressure of the gas cylinder 801 is set within a certain range under the action of the pilot pressure reducing valve 802, and this pressure value should be greater than or equal to the pressure at the outlet of the inflation terminal device to ensure that the inflation terminal device can achieve normal inflation. This embodiment uses two external gas sources as an example. Both external gas sources are output through pilot pressure reducing valves and connected to the input end of a three-way valve 900 via gas pipes. The output end of the three-way valve 900 is connected to the aforementioned gas filling terminal device. The three-way valve 900 can be used to select the gas entering the gas filling terminal device. For example, the gas source required for filling wine is generally an inert gas that does not react with wine, while the gas source required for filling sparkling wine and other beverages is carbon dioxide. Depending on the needs, the corresponding gas cylinder can be selected for filling by controlling the three-way valve 900, without having to frequently change the gas pipe connection between the gas filling terminal device and the gas cylinder, which greatly simplifies the operation for the user.

[0043] The external inflation device of this application allows for further depressurization of the gas from an external gas source as it enters the component to be inflated, ensuring stable pressure at the terminal outlet. This prevents dangerous situations where high-pressure gas could directly enter the component due to pilot pressure reducing valve failure or misoperation at the gas cylinder end. Furthermore, the inflation terminal device features a pressure relief hole to promptly release high-pressure gas if the pressure exceeds a predetermined level, further enhancing safety. Additionally, a pressure detection device on the connection section can determine the completion of inflation and monitor the normal operating pressure range of the external gas source, improving inflation safety and simplifying the user's inflation operation. During use, different gas cylinders can be connected via a three-way valve to meet varying inflation needs, allowing for selection of the appropriate cylinder for output. This avoids frequent disassembly of the inflation terminal device, greatly simplifying the user's inflation process.

[0044] It is evident that those skilled in the art can make various modifications and alterations to the embodiments of the present invention without departing from the spirit and scope of the invention. In this way, the invention is also intended to cover such modifications and alterations if they fall within the scope of the claims and their equivalents. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not indicate that a combination of these measures cannot be used for profit. Any reference numerals in the claims should not be considered as limiting the scope.

Claims

1. An inflation terminal device, characterized in that, The device includes: an inflation head, a pressure reducing valve assembly, and a connecting part. The inflation head is located at the outlet end of the pressure reducing valve assembly. The inflation head is a trigger switch type structure, including a valve core and a switch body. The valve core is located in a cavity inside the switch body, and the air inlet channel of the cavity opens when the valve core is pressed against the part to be inflated, and closes when the valve core moves away from the part to be inflated. One end of the connecting part has a cavity, and the pressure reducing valve assembly is sealed in the cavity. The other end of the connecting part is connected to an external air source. An air passage is provided between the two ends of the connecting part, and on the side closer to the external air source... A pressure detection device communicating with the air passage is provided on the connecting part; the pressure reducing valve assembly includes a pressure reducing valve and a control valve. The pressure reducing valve includes a pressure reducing valve body, a piston seat, a piston, and a spring. The pressure reducing valve body is sealed to the cavity of the connecting part. The piston seat and the piston are fitted together in the cavity inside the pressure reducing valve body. The spring is sleeved between the piston and the piston seat. The control valve is located at the bottom of the pressure reducing valve. A pressure relief hole communicating with the outside is provided on the pressure reducing valve body and the connecting part. When the piston is subjected to pressure exceeding a predetermined pressure, the lower end face of the piston can exceed the height of the pressure relief hole.

2. The inflation terminal device according to claim 1, characterized in that, The upper part of the piston seat is provided with a pressure adjustment knob. When the pressure adjustment knob is rotated, the piston seat is displaced along its axial direction to adjust the compression stroke of the spring.

3. The inflation terminal device according to claim 1, characterized in that, It also includes a housing, which comprises two connectable housing structures. The pressure reducing valve assembly and the connecting part are fixedly disposed in the internal cavity formed by the two connectable housing structures. The connecting part and the housing are respectively provided with a limiting groove and a corresponding limiting protrusion structure.

4. The inflation terminal device according to claim 1, characterized in that, One end of the connecting part is connected to the external air source through an air pipe, and a spring wire harness or protective sleeve is provided outside the air pipe at one end of the connecting part.

5. An inflation terminal device according to claim 3, characterized in that, The pressure detection device includes a pressure gauge, and the housing is provided with a display window for the pressure gauge. The pressure gauge is provided with a pointer, a working area and a warning area.

6. An inflation terminal device according to claim 5, characterized in that, The connecting part has a radially opened pressure detection hole that communicates with the air passage, and the detection head of the pressure gauge is sealed to the pressure detection hole.

7. An inflation system, characterized in that, The device includes an inflation terminal as described in any one of claims 1-6, and further includes at least one external air source, which is connected to the inflation terminal via an air pipe.

8. An inflation system according to claim 7, characterized in that, The external air source includes a gas cylinder and a pilot pressure reducing valve. The pilot pressure reducing valve is located at the mouth of the gas cylinder and is connected to one end of the connecting part through a gas pipe. The output air pressure of the pilot pressure reducing valve is greater than or equal to the air outlet pressure of the inflation terminal device.

9. An inflation system according to claim 7, characterized in that, It includes two different external air sources, which are connected to the input end of a three-way valve via air pipes. The output end of the three-way valve is connected to the connection part of the inflation terminal equipment.

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