Switch assembly for inflating automobile tire and inflating system

Abstract

The utility model relates to the technical field of inflating devices, and discloses a switch assembly for inflating an automobile tire and an inflating system, and the switch assembly comprises a main body which is provided with a first air chamber and a second air chamber which are communicated with each other; the power supply and the circuit board are arranged in the main body, and the power supply is electrically connected with the circuit board; the circuit board is electrically connected with a first spring ejector pin and a second spring ejector pin. The piston rod is movably arranged in the main body, and a conductive structure is arranged on the piston rod; the piston rod can move towards one side close to the first spring ejector pin and the second spring ejector pin, so that the second air chamber is communicated with the first air chamber, and the first spring ejector pin and the second spring ejector pin are conducted through the conductive structure; the piston rod can move towards the side away from the first spring ejector pin and the second spring ejector pin, so that the second air chamber is separated from the first air chamber, and the conductive structure is separated from the first spring ejector pin and the second spring ejector pin. The switch assembly has the advantages of being high in sensitivity, good in stability and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to air charging device technical field especially relates to a switch subassembly and inflation system for automobile tire inflation. BACKGROUND

[0002] If the tire pressure is insufficient during the truck driving, it is easy to cause the tire adhesion area and rotation resistance to increase, and the fuel consumption to rise. It is easy to cause the vehicle to shake, and cause the goods to fall and the safety accidents such as rollover. Therefore, it is particularly necessary to monitor the vehicle tire pressure and inflate in time.

[0003] The patent with the announcement number "CN219856694U" discloses a switch subassembly and inflation device for automobile tire inflation, which can maintain the automobile tire pressure stable in real time and improve the transportation safety. However, some problems are highlighted in the actual use process, such as:

[0004] By setting the magnetic part (i.e. magnet) on the piston rod, setting the magnetic sensitive switch (i.e. reed tube) on the cylinder, the magnetic sensitive switch is beside the piston rod, when the piston rod moves up, the tire is inflated, the piston moves up, which will align the magnetic part with the magnetic sensitive switch, and turn on the magnetic sensitive switch, and the prompter alarms. When the piston moves down, the tire is not inflated, which will misalign the magnetic part with the magnetic sensitive switch, and turn off the magnetic sensitive switch, and the prompter stops alarming. The reaction is not sensitive, and the reliability is poor. Because the piston is pushed by the spring at one end and the air pressure at the other end during the lifting process, the piston is easy to shake up and down, which causes the magnetic sensitive switch to align and misalign at times, and the tire is inflated, but the magnetic sensitive switch does not turn on and does not send the signal. Moreover, the magnetic sensitive switch needs to be bent and welded during assembly, which is easy to cause the glass tube to break, the magnet position needs to be adjusted, the assembly requirement is high, and the assembly efficiency is low.

[0005] The pneumatic pressure switch is set on the top of the cylinder, when the system pressure is low, such as the tire burst, the pneumatic pressure switch triggers, and sends the alarm signal. The pneumatic pressure switch needs to be purchased externally, and the cost is high.

[0006] Moreover, the external power supply needs complicated lines and connectors, during the assembly, thirty-six lines are needed to be welded, which not only is time-consuming and laborious, but also is easy to cause the welding error or the welding problem. UTILITY MODEL CONTENTS

[0007] In view of the above problems in the prior art, the technical problem to be solved by the utility model is to provide a switch subassembly and inflation system for automobile tire inflation, which has high sensitivity, good stability and low cost.

[0008] The utility model discloses a technical scheme that solves its technical problem adopts, proposes a switch subassembly for automobile tire inflation, including:

[0009] The main body is provided with the first gas chamber and the second gas chamber that communicate with each other, and the gas source can communicate with the first gas chamber to guide the gas into.

[0010] The power supply and the circuit board are arranged in the main body, and the power supply is electrically connected with the circuit board.

[0011] The piston rod is movably arranged in the main body, and the piston rod is provided with a conductive structure.

[0012] The piston rod can move to the side close to the first spring needle and the second spring needle, so that the second gas chamber communicates with the first gas chamber, and the conductive structure makes the first spring needle and the second spring needle conductive.

[0013] The piston rod can move to the side away from the first spring needle and the second spring needle, so that the second gas chamber is disconnected from the first gas chamber, and the conductive structure is separated from the first spring needle and the second spring needle.

[0014] Further, the first spring needle and the second spring needle each include a needle seat, a needle head and a first spring, the needle seat is fixedly arranged on the main body, the needle head is movably arranged on the needle seat, and the first spring is arranged between the needle head and the needle seat.

[0015] When the piston rod moves to the side close to the first spring needle and the second spring needle, the conductive structure makes the first spring needle and the second spring needle conductive, the conductive structure abuts against the needle head, and the first spring is compressed.

[0016] Further, a first step is protruded on the outer periphery of the needle seat, a first sealing ring is sleeved on the needle seat, and the first sealing ring abuts against the end face of the first step.

[0017] A sealing glue groove is arranged on the main body, the first step is located in the sealing glue groove, sealing glue is filled in the sealing glue groove, and the first step is wrapped by the sealing glue.

[0018] Further, a convex head is protruded in the sealing glue groove, an inner clamping groove section is formed on the convex head of the sealing glue groove, the sealing glue groove further includes an outer clamping groove section coaxial with the inner clamping groove section, and the inner clamping groove section and the outer clamping groove section can limit the sealing glue from separating from the sealing glue groove.

[0019] Further, a second step is protruded outwardly from the outer periphery of the piston rod, a second spring is arranged between the second step and the nose, and the two ends of the second spring are respectively in abutment with the nose and the second step, and when the piston rod moves towards the side close to the first spring needle and the second spring needle, the second spring is compressed;

[0020] The conductive structure is configured as a conductive gasket arranged on the second step, and the bottom of the second step is provided with a second sealing ring.

[0021] Further, a pressure relief port is arranged on the main body, and an adjustable pressure relief valve is arranged at the pressure relief port;

[0022] The adjustable pressure relief valve comprises a plug, a third spring and a first adjustable screw, the plug is movably arranged at the pressure relief port to control the opening or closing of the pressure relief port, the first adjustable screw is movably arranged at the pressure relief port and is threadedly connected with the main body, and the third spring is tensioned between the plug and the first adjustable screw, and the compression amount of the third spring can be adjusted by screwing the first adjustable screw, so that the pressure relief value of the adjustable pressure relief valve is adjusted.

[0023] Further, the main body comprises a cylinder body and a top cover, the top cover is detachably arranged on the cylinder body, the top cover and the cylinder body surround a mounting cavity, and the power supply and the circuit board are arranged in the mounting cavity.

[0024] Further, a low-pressure alarm switch is arranged in the main body, and the low-pressure alarm switch is arranged in the first gas chamber;

[0025] The low-pressure alarm switch comprises a pushing piece, a second adjustable screw, a fourth spring and a fifth spring, the second adjustable screw is arranged in the first gas chamber and is threadedly connected with the main body, the pushing piece is in abutment with the second adjustable screw and the fourth spring, one end of the fourth spring away from the pushing piece is in abutment with the circuit board, and the fifth spring is tensioned between the main body and the pushing piece.

[0026] When the pressure in the first gas chamber is less than a set value, the fifth spring is in a relaxed state, and the circuit board emits a low-pressure alarm signal.

[0027] Further, an air outlet is arranged on the main body and communicates with the second gas chamber, the air outlet is configured as a longitudinally arranged waist hole, and the length of the waist hole is greater than the thickness of the second step.

[0028] The technical scheme adopted by the utility model to solve the technical problems is also proposed, and the utility model discloses an inflation system, which comprises:

[0029] The utility model provides an automobile, has air source and a plurality of automobile tires,

[0030] The switch assembly for inflating automobile tires is arranged on the automobile, wherein the number of the piston rods is multiple, and each of the piston rods is correspondingly provided with a first spring needle and a second spring needle;

[0031] The main body is provided with a plurality of external joints, the external joints are communicated with the second air chamber, and each of the automobile tires is communicated with one of the external joints; and the first air chamber is communicated with the air source.

[0032] Compared with the prior art, the utility model has at least the following beneficial effects:

[0033] In the utility model, the conductive structure is arranged on the piston rod, when the air pressure of the automobile tire is insufficient, the system drives the piston to move to the side close to the first spring needle and the second spring needle, the conductive structure makes the first spring needle and the second spring needle conductive, sends a signal, and indicates that the corresponding automobile tire is in the inflation state. The first spring needle and the second spring needle structure are adopted to replace the original reed tube and magnet, the signal stability and reliability can be ensured, the situation that the switch signal is disconnected due to uneven force of the piston can be effectively avoided, that is, the situation that the over-amount of air is small and no alarm occurs. Moreover, the first spring needle and the second spring needle are adopted, the assembly difficulty of the production personnel can be effectively reduced, and the assembly efficiency is improved. The spring needle is sealed by the sealing glue and the sealing ring, the sealing effect is good, and the situation of air leakage is avoided.

[0034] In the utility model, the original spring safety valve is cancelled, needs to be purchased externally, and is high in cost. The built-in adjustable pressure relief valve is adopted to replace the original spring safety valve, when the system pressure is higher than the set pressure, the third spring is compressed, gas is released to make the system pressure return to normal, and the pressure relief value can be adjusted by screwing the first adjustable screw. The adjustable pressure relief valve is simple in structure, can be internally manufactured, reduces the material cost, and can reduce the overall external contour size, and avoids damage due to collision.

[0035] In the utility model, the original pneumatic pressure switch is cancelled, needs to be purchased externally, and is high in cost. The built-in low-pressure alarm switch is adopted to replace the original pneumatic pressure switch, when the system pressure is normal, the fifth spring is in the compressed state, the fourth spring is in point contact with the circuit board. When the system pressure is lower than the normal value, the fifth spring is elongated, the fourth spring is disconnected with the circuit board, an electric signal is generated, alarm information is sent, and the driver is prompted that the automobile tire has a large air leakage. The built-in low-pressure alarm switch can effectively reduce the cost.

[0036] The gas outlet is arranged as a vertical waist hole, and the length of the waist hole is greater than the thickness of the second step on the piston, so that the situation that the gas outlet is blocked due to negative pressure formed by the piston rising can be avoided.

[0037] The utility model discloses, built-in power (namely battery), need not complicated line and joint, can effectively reduce assembly difficulty, improve assembly efficiency.Under non -working condition, do not consume electricity, and power consumption is low under working condition, and battery replacement is convenient, and structural stability is also better. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is the structure diagram of switch subassembly for automobile tire inflation of the utility model;

[0039] Figure 2 It is Figure 1 The plane schematic view of the utility model;

[0040] Figure 3 It is Figure 2 The sectional view along A-A;

[0041] Figure 4 It is Figure 3 The local enlarged view of B in the utility model;

[0042] Figure 5 It is Figure 4 The schematic view of the piston moving to the side close to the spring needle and conducting in the utility model;

[0043] Figure 6 It is Figure 1 The explosion view of the utility model;

[0044] Figure 7 It is the distribution schematic view of spring needle on the main part;

[0045] Figure 8 It is Figure 7 The half sectional schematic view of the utility model;

[0046] Figure 9 It is Figure 1 The half sectional view along the adjustable pressure relief valve;

[0047] Figure 10 It is Figure 9 The local enlarged view of C in the utility model;

[0048] Figure 11 It is Figure 9 The local enlarged view of D in the utility model.

[0049] In the drawing:

[0050] 1, main body; 10, cylinder; 11, top cover; 101, first air chamber; 102, second air chamber; 103, sealing glue groove; 103A, inner clamping groove section; 103B, outer clamping groove section; 104, convex head; 105, pressure relief port; 106, gas outlet; 12, external connector; 13, gas source connector;

[0051] 2, power supply;

[0052] 3, circuit board;

[0053] 4, first spring needle; 451, needle seat; 451A, first step; 452, needle head; 453, first spring; 454, first sealing ring; 46, sealing glue;

[0054] 5, second spring needle;

[0055] 6, piston rod; 60, conductive structure; 61, second step; 62, second spring; 63, second sealing ring;

[0056] 7, adjustable pressure relief valve; 71, plug; 72, third spring; 73, first adjustable screw;

[0057] 8, low pressure alarm switch; 81, push piece; 82, second adjustable screw; 83, fourth spring; 84, fifth spring. DETAILED DESCRIPTION

[0058] The following is a specific embodiment of the present application and further describes the technical scheme of the present application in combination with the drawings, but the present application is not limited to these embodiments.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0060] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0061] In the utility model, unless another definite provision and limitation, the terms "connect", "fix" and the like should be understood broadly, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirect connection through intermediate medium, can be the communication of two elements or the interaction of two elements, unless another definite limitation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0062] In addition, the technical solutions of various embodiments of the utility model can be combined with each other, but it must be based on that ordinary skilled in the art can realize, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not in the protection scope required by the utility model.

[0063] Embodiment one:

[0064] As shown in the figure, the switch assembly for inflating automobile tire of the embodiment mainly includes: main body 1, power supply 2, circuit board 3, first spring needle 4, second spring needle 5, piston rod 6, adjustable pressure relief valve 7, low pressure alarm switch 8 and the like structure. Figures 1-6 The main body 1 is provided with the first gas chamber 101 and the second gas chamber 102 that are communicated with each other, and the gas source can be communicated with the first gas chamber 101 to guide gas into. The second gas chamber 102 can be communicated with the automobile tire to output gas. Specifically, the main body 1 of the embodiment mainly includes cylinder body 10 and top cover 11, in order to facilitate assembly and manufacturing, the cylinder body 10 is composed of upper and lower two parts, which can be segmented and manufactured according to actual needs. Six gas outlets 106 are arranged in the circumferential direction of the cylinder body 10, and each gas outlet 106 is butt jointed with an external connector 12, the external connector 12 is threadedly detachably connected with the cylinder body 10, and the external connector 12 can be communicated with the gas nozzle of the automobile tire through the gas pipe.

[0065] Preferably, the gas outlet 106 of the embodiment is configured as a vertically arranged waist hole, and the length of the waist hole is greater than the thickness of the second step 61. In actual use, the gas outlet 106 is arranged as a vertical waist hole, and the length thereof is greater than the thickness of the second step 61 on the piston, so that the situation that the gas outlet 106 is blocked due to the negative pressure formed by the piston rising can be avoided. The gas flow is stable, and the gas flow is large.

[0066]

[0067] ​The power supply 2 and the circuit board 3 are arranged in the main body 1, and the power supply 2 is electrically connected with the circuit board 3; the circuit board 3 is electrically connected with the first spring needle 4 and the second spring needle 5 arranged at intervals, and the first spring needle 4 and the second spring needle 5 are connected in the control circuit of the circuit board 3. Specifically, the top cover 11 of the embodiment is detachably covered on the cylinder body 10, and the top cover 11 and the cylinder body 10 form an installation cavity, and the power supply 2 and the circuit board 3 are built-in in the installation cavity. The top cover 11 and the cylinder body 10 are detachably fixedly connected by screws, and when the power supply 2, i.e. the battery, needs to be replaced, the top cover 11 can be detached from the cylinder body 10.

[0068] In actual use, the built-in power supply 2 (i.e. the battery) of the embodiment can effectively reduce the assembly difficulty and improve the assembly efficiency without complicated lines and connectors. In the non-working state, no power is consumed, and in the working state, the power consumption is low, the battery is easy to replace, the structure is stable, and the original external power supply needs complicated lines and connectors. When assembling, 4 8-core wire heads and 2 power supply wire heads are needed, a total of 36 wires, which is time-consuming and easy to cause welding errors or poor welding quality. After installation, during long-term use, the connector is easy to loosen and the line is easy to be damaged due to friction with various parts of the vehicle chassis. The built-in power supply 2 of the embodiment greatly reduces the workload of welding and the quality problems caused by welding errors or poor welding, and also reduces the quality risks of connector loosening and line damage caused by friction between the line and the vehicle chassis. That is, the switch assembly of the embodiment is a wireless transmission type multi-way distributor, which cancels the complicated line arrangement and reduces the workload of the assembly workers.

[0069] As Figures 3-8As shown, the piston rod 6 is movably arranged in the main body 1, and the piston rod 6 is provided with a conductive structure 60. In this embodiment, the conductive structure 60 is configured as a conductive pad. Specifically, the piston rod 6 is movably arranged in the second air chamber 102, and is used to control the communication or isolation between the first air chamber 101 and the second air chamber 102. In operation, the piston rod 6 can move towards the side close to the first spring needle 4 and the second spring needle 5, so that the second air chamber 102 communicates with the first air chamber 101, and the conductive structure 60 conducts the first spring needle 4 and the second spring needle 5. After the first spring needle 4 and the second spring needle 5 are conducted by the conductive structure 60, the circuit is connected, and an alarm signal such as an indicator light is lit, indicating that the corresponding automobile tire is in an inflated state. In operation, the piston rod 6 can move away from the side of the first spring needle 4 and the second spring needle 5, so that the second air chamber 102 is isolated from the first air chamber 101, and the conductive structure 60 is separated from the first spring needle 4 and the second spring needle 5. At this time, there is no alarm signal such as an indicator light, indicating that the corresponding automobile tire is not in an inflated state. In this embodiment, six pistons are configured, and each piston is provided with a first spring needle 4 and a second spring needle 5. The specific number can be set according to the user's needs.

[0070] Specifically, the first spring needle 4 and the second spring needle 5 of this embodiment each include a needle seat 451, a needle head 452, and a first spring 453. The needle seat 451 is fixedly arranged on the main body 1 and fixedly arranged on the circuit board 3. The needle head 452 is movably arranged on the needle seat 451, and the first spring 453 is arranged between the needle head 452 and the needle seat 451. In operation, when the piston rod 6 moves towards the side close to the first spring needle 4 and the second spring needle 5, so that the conductive structure 60 conducts the first spring needle 4 and the second spring needle 5, the conductive structure 60, i.e. the conductive pad, presses the needle head 452, and the first spring 453 is compressed.

[0071] Further specifically, the needle seat 451 of this embodiment has a first step 451A protruding along the outer periphery thereof, and a first sealing ring 454 is sleeved on the needle seat 451, and the first sealing ring 454 abuts against the end face of the first step 451A. The main body 1 is provided with a sealing glue groove 103, and the first step 451A is located in the sealing glue groove 103. The sealing glue groove 103 is filled with sealing glue 46, and the sealing glue 46 wraps the first step 451A. In actual use, the spring needle is sealed by the sealing glue 46 and the sealing ring, which ensures good sealing effect and avoids air leakage.

[0072] And, the sealing groove 103 has a protrusion 104, and the sealing groove 103 forms an inner clamping groove section 103A on the protrusion 104, and the sealing groove 103 further comprises an outer clamping groove section 103B coaxial with the inner clamping groove section 103A, and the inner clamping groove section 103A and the outer clamping groove section 103B can limit the sealing glue 46 from separating from the sealing groove 103. It needs to be explained that each sealing ring groove comprises an inner clamping groove section 103A and an outer clamping groove section 103B, and when the sealing glue 46 is filled, the inner clamping groove section 103A and the outer clamping groove section 103B are filled with the sealing glue 46, that is, the inner protruding ring and the outer protruding ring are formed after the sealing glue 46 solidifies, and when the piston moves up and down to press the spring needle, the sealing glue 46 can be prevented from separating from the main body 1, the structural stability of the spring needle is ensured, the sealing effect of the spring needle is ensured, and the situation of air leakage is avoided.

[0073] In actual use, the conductive structure 60 is arranged on the piston rod 6, when the air pressure of the automobile tire is insufficient, the system drives the piston to move to the side close to the first spring needle 4 and the second spring needle 5, the conductive structure 60 conducts the first spring needle 4 and the second spring needle 5, and sends a signal, indicating that the automobile tire corresponding thereto is in an inflated state. The first spring needle 4 and the second spring needle 5 structure are adopted instead of the original dry reed and magnet, which can ensure stable and reliable signal, and can effectively avoid the situation that the switch signal is disconnected due to uneven force on the piston, that is, the situation that the over-amount of air is small and no alarm occurs. Moreover, the first spring needle 4 and the second spring needle 5 can effectively reduce the assembly difficulty of the production personnel and improve the assembly efficiency.

[0074] In the embodiment, the second step 61 protrudes outward from the outer periphery of the piston rod 6, the second spring 62 is arranged between the second step 61 and the protrusion 104, the two ends of the second spring 62 are respectively abutted against the protrusion 104 and the second step 61, one end of the second spring 62 is sleeved on the protrusion 104, and the second spring 62 is prevented from being displaced. When the piston rod 6 moves to the side close to the first spring needle 4 and the second spring needle 5, the second spring 62 is compressed. When the pressure of the automobile tire is balanced with the pressure of the system, the elastic force of the second spring 62 can reset the piston rod 6, and the piston rod 6 separates the first gas chamber 101 and the second gas chamber 102. The conductive pad is arranged on the second step 61, and the second sealing ring 63 is arranged at the bottom of the second step 61, and the second sealing ring 63 can prevent the backflow of high-pressure gas.

[0075] As Figures 9-10As shown, the main body 1 of the embodiment is provided with a pressure relief port 105, and an adjustable pressure relief valve 7 is arranged at the pressure relief port 105. The adjustable pressure relief valve 7 comprises a plug 71, a third spring 72 and a first adjustable screw 73. The plug 71 is movably arranged at the pressure relief port 105 to control the opening or closing of the pressure relief port 105. The first adjustable screw 73 is movably arranged at the pressure relief port 105 and is threadedly connected with the main body 1. The third spring 72 is tensioned between the plug 71 and the first adjustable screw 73, and the compression amount of the third spring 72 can be adjusted by screwing the first adjustable screw 73 to adjust the pressure relief value of the adjustable pressure relief valve 7.

[0076] In actual use, the original spring safety valve is cancelled in the embodiment, because it needs to be purchased and has high cost. The built-in adjustable pressure relief valve 7 is adopted to replace the original spring safety valve in the embodiment. When the system pressure is higher than the set pressure, the third spring 72 is compressed to release the gas until the system pressure returns to the normal value, and the pressure relief value can be adjusted by screwing the first adjustable screw 73. The structure of the adjustable pressure relief valve 7 is simple, and the internal manufacturing can be realized. Therefore, the material cost is reduced, and the overall external outline size is reduced to avoid damage caused by collision.

[0077] As shown in Figure 9 and Figure 11 The low-pressure alarm switch 8 is arranged in the main body 1 and is arranged in the first gas chamber 101. The low-pressure alarm switch 8 comprises a pushing piece 81, a second adjustable screw 82, a fourth spring 83 and a fifth spring 84. The second adjustable screw 82 is arranged in the first gas chamber 101 and is threadedly connected with the main body 1. The alarm value can be adjusted by screwing the second adjustable screw 82. The pushing piece 81 movably abuts against the second adjustable screw 82 and the fourth spring 83. One end of the fourth spring 83 away from the pushing piece 81 movably abuts against the circuit board 3. The fifth spring 84 is tensioned between the main body 1 and the pushing piece 81. In working, when the system pressure is normal, the fifth spring 84 is in a compressed state, and the fifth spring 84 is in a point contact state with the circuit board 3, and no alarm signal is emitted. When the pressure in the first gas chamber 101 is less than the set value, the fifth spring 84 is in a relaxed state, the fifth spring 84 is elongated, the fourth spring 83 is no longer in contact with the circuit board 3, and the circuit board 3 emits an alarm signal, such as lighting a corresponding alarm lamp to prompt the driver that the corresponding automobile tire has a large air leakage.

[0078] In actual use, the embodiment cancels the original pneumatic pressure switch, which needs to be purchased and has high cost. The built-in low-pressure alarm switch 8 is used to replace the original pneumatic pressure switch. When the system pressure is normal, the fifth spring 84 is in a compressed state, and the fourth spring 83 is in contact with the circuit board 3. When the system pressure is lower than the normal value, the fifth spring 84 is elongated, the fourth spring 83 is disconnected with the circuit board 3, an electrical signal is generated, and an alarm information is sent to prompt the driver that the automobile tire has a large air leakage. The built-in low-pressure alarm switch 8 can effectively reduce the cost, and the cost can be saved by about ten times.

[0079] The working principle of the switch assembly in the embodiment is as follows: the first gas chamber 101 is communicated with the air source of the automobile, and the six external connectors 12 are respectively communicated with the six tires. If the air pressure of the automobile tire is in a normal state, the piston rod 6 is kept at the bottom position of the main body 1 under the action of the second spring 62, so as to separate the first gas chamber 101 and the second gas chamber 102. When the automobile tire leaks and the air pressure is lower than the normal value, the first gas chamber 101 is communicated with the second gas chamber 102 under the action of the air pressure difference, the system is inflated to the corresponding automobile tire, the conductive structure 60 on the piston rod 6, i.e. the conductive gasket, conducts the first spring needle 4 and the second spring needle 5, the corresponding circuit is connected, the circuit board 3 sends an alarm signal, and the indicator lamp corresponding to the automobile tire is lighted to prompt the driver that the automobile tire is in an inflation state, so that the driver can accurately know which automobile tire is being inflated. When the air pressure of the automobile tire returns to the normal value, the system stops inflating the automobile tire, and the piston rod 6 moves downward to separate the first gas chamber 101 and the second gas chamber 102.

[0080] Embodiment two:

[0081] The inflation system in the embodiment mainly includes:

[0082] The automobile has an air source and a plurality of automobile tires. For commercial vehicles, the braking system is pneumatic, and the air source connector 13 can be communicated with the air outlet pipe of the main machine to take air.

[0083] The switch assembly for inflating the automobile tire in the embodiment is fixedly arranged on the automobile. The number of the piston rods 6 is multiple, and each piston rod 6 is provided with a first spring needle 4 and a second spring needle 5 on the side. The main body 1 is provided with a plurality of external connectors 12, and the external connectors 12 are communicated with the second gas chamber 102. Each automobile tire is communicated with one external connector 12, and the first gas chamber 101 is communicated with the air source.

[0084] In the scheme, the switch assembly has high sensitivity, good stability, and low cost.

Claims

1. A switch assembly for inflating automobile tires, characterized in that, include: The main body has a first air chamber and a second air chamber that are interconnected. An air source can be connected to the first air chamber to introduce gas; the second air chamber can be connected to a car tire to output gas. A power supply and a circuit board are disposed in the main body, and the power supply is electrically connected to the circuit board; the circuit board is electrically connected to a first spring pin and a second spring pin respectively. A piston rod is movably disposed within the main body, and the piston rod is provided with a conductive structure; The piston rod can move toward the side closer to the first spring pin and the second spring pin, such that: the second air chamber is connected to the first air chamber, and the conductive structure conducts electricity between the first spring pin and the second spring pin. The piston rod can move away from the first spring pin and the second spring pin, thereby isolating the second air chamber from the first air chamber, and the conductive structure detaches from the first spring pin and the second spring pin.

2. The switching assembly for inflating automobile tires according to claim 1, characterized in that, Both the first spring-loaded pin and the second spring-loaded pin include: a needle seat, a needle tip, and a first spring. The needle seat is fixedly disposed on the main body, the needle tip is retractably disposed on the needle seat, and the first spring is disposed between the needle tip and the needle seat. When the piston rod moves toward the side closer to the first spring pin and the second spring pin, causing the conductive structure to conduct electricity between the first spring pin and the second spring pin, the conductive structure presses against the needle tip, and the first spring is compressed.

3. The switching assembly for inflating automobile tires according to claim 2, characterized in that, The needle holder has a first step protruding along its outer periphery, and a first sealing ring is fitted on the needle holder, with the first sealing ring abutting against the end face of the first step. The main body is provided with a sealant groove, and the first step is located in the sealant groove; the sealant groove is filled with sealant, and the sealant covers the first step.

4. The switching assembly for inflating automobile tires according to claim 3, characterized in that, The sealant groove has a protruding head, and the sealant groove forms an inner groove section on the protruding head. The sealant groove also includes an outer groove section coaxial with the inner groove section. The inner groove section and the outer groove section can restrict the sealant from detaching from the sealant groove.

5. The switching assembly for inflating automobile tires according to claim 4, characterized in that, A second step protrudes outward from the piston rod, and a second spring is provided between the second step and the protrusion. The two ends of the second spring abut against the protrusion and the second step, respectively. When the piston rod moves towards the side closer to the first spring pin and the second spring pin, the second spring is compressed. The conductive structure is configured as a conductive pad, which is disposed on the second step; a second sealing ring is provided at the bottom of the second step.

6. The switching assembly for inflating automobile tires according to claim 1, characterized in that, The main body is provided with a pressure relief port, and an adjustable pressure relief valve is provided at the pressure relief port; The adjustable pressure relief valve includes a plug, a third spring, and a first adjustable screw. The plug is movably disposed at the pressure relief port to control the opening or closing of the pressure relief port. The first adjustable screw is movably disposed at the pressure relief port and threadedly connected to the main body. The third spring is tensioned between the plug and the first adjustable screw, and turning the first adjustable screw can adjust the compression of the third spring to adjust the pressure relief value of the adjustable pressure relief valve.

7. The switching assembly for inflating automobile tires according to claim 1, characterized in that, The main body includes a cylinder and a top cover. The top cover is detachably mounted on the cylinder and the top cover and the cylinder form a mounting cavity. The power supply and the circuit board are built into the mounting cavity.

8. The switching assembly for inflating automobile tires according to claim 1, characterized in that, The main body has a built-in low-pressure alarm switch, and the low-pressure alarm switch is located in the first air chamber; The low-pressure alarm switch includes: a push member, a second adjustable screw, a fourth spring, and a fifth spring. The second adjustable screw is disposed in the first air chamber and is threadedly connected to the main body. The push member abuts against the second adjustable screw and the fourth spring respectively. The end of the fourth spring away from the push member abuts against the circuit board. The fifth spring is tensioned between the main body and the push member. When the pressure in the first chamber is less than the set value, the fifth spring is relaxed, causing the circuit board to emit a low-pressure alarm signal.

9. The switching assembly for inflating automobile tires according to claim 5, characterized in that, The main body is provided with an air outlet that communicates with the second air chamber. The air outlet is configured as a waist hole arranged longitudinally, and the length of the waist hole is greater than the thickness of the second step.

10. An inflation system, characterized in that, include: A car, which has an air source and multiple tires; The switching assembly for inflating automobile tires as described in any one of claims 1-9 is disposed on the automobile, wherein, The number of piston rods is multiple, and each piston rod is provided with a first spring pin and a second spring pin on its side; The main body is provided with multiple external connectors, and the external connectors are connected to the second air chamber. Each of the car tires is connected to one of the external connectors. The first air chamber is connected to the air source.

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