An air compressor pressure regulating valve capable of conveniently adjusting the pressure setting interval value

Abstract

The present invention belongs to the field of compressor technology and relates to the structure and layout of an air compressor pressure regulating valve, which includes components such as a pressure regulating valve body, a balancing piston, a pressure regulating spring, a stop valve, a return spring, and a cylinder cover. Its most significant feature is that the pressure regulating valve is provided with a pressure regulating spring, and is also specially configured with an adjusting screw and a limit nut, or an adjusting screw and a shift spring seat and a limit screw, and other components and their composed mechanisms that can be used to adjust the preload force of the pressure regulating spring. This allows the upper limit value of the output pressure of the exhaust duct of the pressure regulating valve to be adjusted very conveniently and accurately, so that the range of the working pressure of the lower device can be flexibly, conveniently, and accurately regulated according to the user object, effectively expanding the adaptability of the pressure regulating valve to the gas pressure of different lower devices, and can conveniently and accurately adjust the gas supply pressure range to ensure the consistency of product quality, ultimately achieving the purpose of effectively reducing the production cost of the air compressor pressure regulating valve.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors and relates to the structure and layout of an air compressor pressure regulating valve. Specifically, it relates to an air compressor pressure regulating valve that can conveniently, quickly and accurately adjust the range setting value of the working pressure range of a downstream gas-consuming device. Background Art

[0002] An air compressor is a general-purpose fluid mechanical device with large output, wide application, and profound impact. The high-pressure air it outputs is often pre-stored in a gas tank. When a downstream gas-using device needs pressurized air, it is then drawn from the tank to the target device. As we all know, the downstream device will use different pressures output by the gas tank depending on the user. For example, the common pressure range of nail guns during renovation is 0.7 to 1.0 MPa, while spray guns for painting and decorating require a slightly lower pressure range, such as 0.3 to 0.5 MPa. All of these require that the high-pressure gas in the gas tank, which is almost a single pressure value, be properly regulated by a device to output an output pressure that meets the required gear value and is then given to the downstream device for use. This device that can regulate the pressure output is a pressure regulating valve, or simply a pressure regulating valve. Currently, pressure regulating valves are an indispensable device in air pressure systems and have become standard equipment for various pneumatic products. Generally speaking, the lower limit value of the working pressure range of the lower device must be guaranteed, and the upper limit pressure value can be adjusted according to different users. For example, the pressure range of the nail gun used in the above-mentioned decoration is 0.7 to 1.0MPa. When nails need to be driven into harder cement walls or floors, the upper limit of the interval setting value needs to be increased, such as to 1.3MPa. In other words, the working pressure range of the nail gun belonging to the lower device should be adjusted to 0.7 to 1.3MPa. As the requirements of the lower device for gas pressure become more and more refined and demanding, higher and higher requirements are placed on the pressure regulation accuracy and pressure regulation range of the pressure regulating valve. It should be pointed out that the lower limit of the working pressure of the lower gas device is usually regulated by the throttling device equipped with the gas tool, device or system. The regulation of this lower limit value can be easily achieved without a pressure regulating valve. Especially under the premise of large-scale production, in order to ensure controllable production costs and consistent batch product quality, pressure regulating valves must possess two basic characteristics: one is that a pressure regulating valve of the same specification should be able to adapt to the gas pressure requirements of as many downstream devices as possible without adding any components or changing the component design, manufacturing, and assembly, thereby reducing product specifications and effectively lowering production costs. The other is that to address the wide fluctuation range of output pressure values caused by various errors and deviations during batch production (or from another perspective, to reduce manufacturing difficulty by appropriately relaxing the tolerances of various pressure regulating valve components, resulting in inconsistent output pressure values), the pressure regulating valve should have a function that allows for quick and convenient adjustment of the pressure range set point after production to ensure product quality consistency and reduce production costs. However, currently, there are no pressure regulating valves for air compressors on the market or in the existing technology that fully possess or meet these two qualities. In other words, there is a lack of air compressor pressure regulating valves that can balance the scalability of product adaptability to reduce production costs with the ability to quickly and accurately adjust the pressure range to ensure product consistency. Summary of the Invention

[0003] In order to improve and remedy the shortcomings of existing air compressor pressure regulating valves, the present invention proposes an air compressor pressure regulating valve that can conveniently adjust the pressure setting interval value. The purpose is: through structural and layout improvement design, the air compressor pressure regulating valve can conveniently and quickly adjust the setting interval value of its output pressure, thereby effectively expanding the adaptability of the pressure regulating valve to the gas pressure of different downstream devices, and at the same time achieving convenient and accurate adjustment of the pressure interval value to ensure product consistency, thereby reducing the production cost of the air compressor pressure regulating valve.

[0004] The purpose of the present invention is achieved as follows: an air compressor pressure regulating valve that can conveniently adjust the pressure setting interval value, which includes a pressure regulating valve body, a balancing piston, a pressure regulating spring, a stop valve, a return spring and a cylinder cover, the cylinder cover is fastened to the pressure regulating valve body or the cylinder cover and the pressure regulating valve body are made as an integral structure; it is characterized in that: a cylinder is provided on the pressure regulating valve body or / and the cylinder cover, the balancing piston is built into the cylinder and can be slidably sealed with the cylinder, and a balancing chamber is constructed on the cylinder and / or the pressure regulating valve body; an air inlet, an exhaust duct and a connecting channel are opened on the pressure regulating valve body, the exhaust duct It is normally connected to the balancing chamber, and the air inlet duct is connected to the balancing chamber via a stop valve; one end of the return spring abuts against the stop valve, and the other end of the return spring abuts against the pressure regulating valve body; an adjusting screw is provided, and the adjusting screw adopts a spiral structure to cooperate with the cylinder cover and / or the pressure regulating valve body, and a limiting nut is also provided, and the limiting nut and the adjusting screw adopt a spiral structure to cooperate with the adjusting screw; one end of the pressure regulating spring directly abuts against the balancing piston or indirectly abuts against the balancing piston via a transition piece, and the other end of the pressure regulating spring directly abuts against the adjusting screw or it indirectly abuts against the adjusting screw through an intermediate piece.

[0005] Furthermore, a stop nut is provided which cooperates with the adjusting screw in a spiral structure, and the stop nut and the limit nut are arranged adjacent to or against each other.

[0006] Furthermore, the intermediate piece with which the pressure-adjusting spring indirectly abuts against the adjusting screw is a gasket-shaped or cylindrical shell-shaped part.

[0007] The regulating screw of the pressure regulating valve is provided with a passive constraint structure of a prism structure, a flat groove structure, a convex key structure or a spline structure at its outer end.

[0008] The pressure regulating valve is provided with a knob, which is provided with an active constraint structure that corresponds to and cooperates with the structure provided at the outer end of the adjusting screw and can drive the adjusting screw to rotate.

[0009] The behavioral result of the active constraint structure of the knob and the passive constraint structure of the adjusting screw is that the knob can drive the adjusting screw to rotate synchronously, and while both rotate, the adjusting screw can perform a telescopic action relative to the knob.

[0010] The pressure regulating valve is provided on the knob, and a rotation-stopping structure is provided on the cylinder cover and / or the pressure regulating valve body.

[0011] The pressure regulating valve is provided with an axial anti-slip hook structure on the knob, and at the same time on the cylinder cover and / or the pressure regulating valve body.

[0012] The cam is secured to the air compressor by means of a camming member which is secured to the air compressor body by means of a camming member which is secured to the air compressor body by means of a camming member and a camming member which is secured to the air compressor body by means of a camming member. A passive constraint structure for receiving the rotational drive is provided at the outer end of the adjusting screw, and the passive constraint structure is in the form of a prism structure, a spline structure or a slot key structure; a shift spring seat is provided, which includes an internal threaded structural hole and a first anti-rotation structure, and the internal threaded structural hole is threadedly matched with the external threaded structural section on the adjusting screw, and the first anti-rotation structure is matched with the second anti-rotation structure provided on the cylinder cover or / and on the pressure regulating valve body; in addition, a limit screw is provided, which is threadedly matched with the adjusting screw and extends at both ends relative to the adjusting screw in the axial direction, and a locking nut is arranged on the outwardly extending threaded section of the limit screw to match the threaded section; one end of the pressure regulating spring directly abuts against the balancing piston or indirectly abuts against the balancing piston via a transition piece, and the other end of the pressure regulating spring directly abuts against the shift spring seat or indirectly abuts against the shift spring seat via a transition piece.

[0013] The internal threaded structural hole of the shift spring seat of the above-mentioned pressure regulating valve is a left-handed thread structure, and the external threaded structural section on the adjusting screw that cooperates with the internal threaded structural hole of the shift spring seat is also a left-handed thread structure; a knob is provided, which is provided with an active constraint structure that corresponds to the prism structure, spline structure or slot key structure provided at the outer end of the adjusting screw and can cooperate with it and drive the adjusting screw to rotate.

[0014] Compared with the prior art, the outstanding advantages of the present invention are: a pressure-regulating spring is arranged on the pressure-regulating valve, and an adjusting screw and a limit nut are configured at the same time, or an adjusting screw, a shift spring seat and a limit screw are configured in a structure and layout manner, so that the preload force of the pressure-regulating spring can be accurately adjusted very conveniently, which means that the upper limit value of the gas pressure of the lower device can be adjusted very quickly. In other words, the working pressure zone of the lower device can be flexibly and conveniently converted according to the user object, thereby effectively expanding the adaptability of the pressure-regulating valve to the gas pressure of different lower devices, and realizing the convenient and accurate adjustment of the pressure range value to ensure the consistency of the product, and ultimately achieving the purpose of reducing the production cost of the air compressor pressure regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an axonometric diagram of an embodiment of an air compressor pressure regulating valve capable of conveniently adjusting pressure setting interval values according to the present invention;

[0016] Figure 2 yes Figure 1 a top view of the illustrated embodiment;

[0017] Figure 3 yes Figure 1 an exploded view of the assembly of the illustrated embodiment;

[0018] Figure 4 yes Figure 1 The embodiment shown is in a state diagram when a lower upper limit output pressure is set;

[0019] Figure 5 yes Figure 1 The embodiment shown is in a state diagram when a larger upper limit output pressure is set;

[0020] Figure 6 yes Figure 1 an axonometric view of the knob of the illustrated embodiment;

[0021] Figure 7 This is an exploded view of another embodiment of the air compressor pressure regulating valve capable of conveniently adjusting the pressure setting interval value of the present invention;

[0022] Figure 8 yes Figure 7 The embodiment shown is in a state diagram when a lower upper limit output pressure is set;

[0023] Figure 9 yes Figure 7 The embodiment shown is in a state diagram when a larger upper limit output pressure is set;

[0024] Figure 10 yes Figure 7 Axonometric view of the knob of the illustrated embodiment. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to specific embodiments. Figure 1 —10:

[0026] An air compressor pressure regulating valve that can conveniently adjust the pressure setting interval value (see Figure 1 —6), including a pressure regulating valve body 1, a balancing piston 2, a pressure regulating spring 3, a stop valve 4, a return spring 5 and a cylinder cover 6, wherein the cylinder cover 6 is fastened to the pressure regulating valve body 1 or the cylinder cover 6 and the pressure regulating valve body 1 are made as an integral structure; the characteristic of the present invention is that a cylinder 16 ( Figure 4 and Figure 5 The figure shows the situation where the cylinder 16 is opened on the pressure regulating valve body 1), the balancing piston 2 is built into the cylinder 16 and can be slidably sealed with the cylinder 16, and a balancing chamber 7 is constructed on the cylinder 16 and / or the pressure regulating valve body 1; the balancing piston 2 and the cylinder 16 can adopt corresponding matching shapes, for example, the cylinder 16 adopts a cylindrical inner hole structure to match the balancing piston 2 with an outer cylindrical outer surface (this is a better matching structure because the circular structure has good manufacturing processability). In addition, they can also adopt other matching structures such as square holes and square columns (not shown in the figure), etc. Of course, in order to ensure the sealing between the balancing piston 2 and the cylinder 16, a seal can be provided at the matching point between them (not shown in the figure given in this embodiment); the balancing chamber 7 refers to an internal space, in which the balancing piston 2 participates in the construction of this balancing chamber 7, or the balancing piston 2 has at least a part of its shape that is part of the wall of the balancing chamber 7, such as Figures 1 to 6 The bottom plane of the balancing piston 2 in the embodiment shown is a part of the balancing chamber 7; the pressure regulating valve body 1 is provided with an intake passage 1a, an exhaust passage 1b and a connecting passage 1c (such as Figure 4 and Figure 5As shown), the exhaust duct 1b and the balancing chamber 7 are kept in a normally open state, that is, the gas pressure in the balancing chamber 7 can be kept consistent with the gas pressure in the exhaust duct 1b. Note that the gas pressure of the lower gas-using device is consistent with the gas pressure in the exhaust duct 1b. In other words, it means that the gas pressure in the balancing chamber 7 can be kept consistent with the gas pressure of the lower gas-using device, but a certain error is allowed due to the existence of various flow losses; in addition, the air intake duct 1a in the present invention is connected to the gas storage tank and / or the compressor exhaust pipe, and the air intake duct 1a is connected to the balancing chamber 7 via a stop valve 8, wherein the stop valve 7 can decide whether to block the connecting channel 1c or open the connecting channel 1c according to needs or specific working conditions, and this connecting channel 1c is a connecting passage communicating between the air intake duct 1a and the balancing chamber 7, that is, the stop valve 4 determines the on-off status of the air intake duct 1a and the balancing chamber 7. When the stop valve 4 abuts against the connecting channel 1c, the connecting channel 1c is blocked, that is, the air intake duct 1a and the balancing chamber 7 are not connected to each other (as shown in FIG. Figure 4 and Figure 5 As shown), when the stop valve 4 is disconnected from the connecting channel 1c, the connecting channel 1c is opened, and the air inlet 1a and the balance chamber 7 are interconnected (not shown in the figure). Here, it should be noted that, for the convenience of positioning and installation, a stop valve seat 4a (as shown) can be provided. Figures 3 to 5 As shown); wherein, one end of the return spring 5 abuts against the stop valve 4, and the other end of the return spring 5 abuts against the pressure regulating valve body 1. The force of the return spring 5 always tends to make the stop valve 4 block the connecting channel 1c. It should be pointed out that, in addition to the end of the return spring 5 Figure 4 and Figure 5 In addition to the arrangement of the pressure regulating valve body 1 directly abutting against the pressure regulating valve body 1 in the case shown, the return spring 5 can also indirectly abut against the pressure regulating valve body 1 through other components (not shown in the figure). In addition, the force exerted by the return spring 5 on the stop valve 4 can be pressure (such as Figure 4 and Figure 5 In particular, the present invention is provided with an adjusting screw 8, which adopts a spiral structure to cooperate with the cylinder cover 6 and / or the pressure regulating valve body 1, Figures 1 to 6 In the embodiment shown, the adjusting screw 8 is a case where a spiral structure is used to cooperate with the cylinder cover 6. In addition, a limit nut 9 is provided. The limit nut 9 and the adjusting screw 8 are used to cooperate with each other in a spiral structure. The spiral structure mentioned here can have various structural forms, among which the most common spiral structure is a thread structure; one end of the pressure regulating spring 3 directly abuts against the A side of the balancing piston 2 (such as Figure 4 and Figure 5As shown), or the pressure regulating spring 3 indirectly abuts against the A side of the balancing piston 2 via a transition piece (not shown in the figure), and the other end of the pressure regulating spring 3 directly abuts against the adjusting screw 8 (not shown in the figure), or the pressure regulating spring 3 indirectly abuts against the adjusting screw 8 through an intermediate piece 10 ( Figure 4 and Figure 5 As shown in FIG. 1 , the pressure regulating spring 3 indirectly abuts against the adjusting screw 8 via the intermediate piece 10, which has the advantage of reducing the negative effects of the rotation of the adjusting screw 8 and the pressure regulating spring 3. The force applied to the pressure regulating valve of the present invention is as follows: one end of the pressure regulating spring 3 directly or indirectly abuts against the adjusting screw 8, and the other end of the pressure regulating spring 3 directly or indirectly abuts against one side of the balancing piston 2 (i.e., this side is defined as side A as mentioned above, see FIG. 1 ). Figure 4 and Figure 5 ), so the preload force of the pressure regulating spring 3 and the force of the external atmosphere act on the A side of the balancing piston 2, while the other side of the balancing piston 2 (this side is defined as the B side, see Figure 4 and Figure 5) Since it is in direct contact with the stop valve 4 (the balancing piston 2 can pass through the connecting channel 1c through its protruding structure and come into contact with the stop valve 4) and the B side is also a part of the balancing chamber 7, the B side of the balancing piston 2 is respectively acted upon by the gas force from the balancing chamber 7 (its pressure is equivalent to the pressure in the exhaust passage 1b, that is, the working pressure of the lower gas-using device), and is simultaneously subjected to the contact force from the stop valve 3. Note that one end of the return spring 5 rests on the stop valve 4, and whether the inlet passage 1a and the balancing chamber 7 are open or closed depends on whether the stop valve 4 closes the connecting channel 1c, and whether the stop valve 4 closes the connecting channel 1c depends on whether the balancing piston 2 can push open the stop valve 4, and the balancing piston 2 is Whether the stop valve 4 can be pushed open depends on the final result of the game between the forces on the A side and the B side of the balancing piston 2; as mentioned above, the preload force of the pressure-regulating spring 3 and the force of the external atmosphere act on the A side of the balancing piston 2, and the gas pressure in the balancing chamber 7, as well as the combined force of the gas force in the intake duct 1a and the reset sealing force of the reset spring 5 and the force transmitted through the stop valve 4 act on the B side of the balancing piston 2, wherein the stop valve 4 is also subjected to the gas force from the balancing chamber 7 and the gas force always attempts to push the stop valve 4 open to open the connecting channel 1c; the pressure regulating working principle of the pressure regulating valve of the present invention is: by preloading the pressure-regulating spring 3 to respond to a maximum working air pressure of a lower device, when the lower device When the device uses gas and the air pressure in the balance chamber 7 is slightly lower than the working air pressure, the force on the A side of the balance piston 2 is greater than the force on the B side, thus gaining the upper hand and forcing the balance piston 2 to produce axial displacement and push open the stop valve 4 (at this time, the combined force of the contact force of the balance piston 2 on one side of the stop valve 4 and the force of the gas in the balance chamber 7 is greater than the combined force of the force of the return spring 5 on the other side of the stop valve 4 and the force of the gas in the intake duct 1a). Therefore, the high-pressure gas in the gas tank with a higher pressure value or in the exhaust pipe of the compressor enters the balance chamber 7 through the connecting channel 1c to perform an air replenishment operation, and the air pressure in the balance chamber 7 quickly returns to the maximum working pressure originally set by the lower device. At this time, the force on the B side of the balance piston 2 begins to dominate The balance piston 2 is forced to produce axial displacement and the stop valve 4 blocks the connecting channel 1c again (at this time, the combined force of the contact force of the balance piston 2 on one side of the stop valve 4 and the gas force in the balance chamber 7 is less than the combined force of the return spring 5 on the other side of the stop valve 4 and the gas force in the intake duct 1a), so the gas tank stops replenishing air to the balance chamber 7, and the action is repeated and finally the working pressure of the lower device is stabilized; obviously, the preload force of the pressure regulating spring 3 can be changed by screwing in or out the adjusting screw 8, and the power comparison between the balance piston 2 on the A side and the B side can be changed. In other words, the threshold value of the displacement action of the balance piston 2 can be adjusted. When the adjusting screw 8 is in a more screwed-out state, for example, in response Figure 4In the state shown, the preload force of the pressure regulating spring 3 is small, which corresponds to the relatively low upper limit of the gas pressure of the lower gas device regulated by it, and when the adjusting screw 8 is in a more screwed state, for example, Figure 5 In the state shown, the preload force of the pressure regulating spring 3 is relatively large, which corresponds to the relatively high upper limit of the gas pressure of the lower gas-using device regulated by it. A specific example is when the adjusting screw 8 is at the threshold value of 0.7MPa → at this time, if the lower device uses gas, the gas pressure in the exhaust duct 1b is lower than 0.7MPa → then the balancing piston 2 starts to move and forces the stop valve 4 to move through contact → so that the connecting channel 1c is opened and the compressor or gas tank starts to replenish gas into the balancing chamber 7 → the gas pressure in the balancing chamber 7 rises rapidly → the balancing piston 2 starts to return → the pressure regulating spring 3 is compressed and tightened again → the balancing piston 2 reaches The original equilibrium position stops moving → now it returns to the original 0.7MPa threshold value; if at this time it is necessary to adjust the gas pressure of the lower device, for example, to a higher level of 1.0MPa, it is only necessary to screw in the adjusting screw 8 to make it correspond to the moving threshold so that the pressure in the balancing chamber 7 is 1.0MPa. At this time, the stop valve 4 will continue to replenish gas into the balancing chamber 7 until the gas pressure in the balancing chamber 7 reaches 1.0MPa. The balancing piston 2 will then return to its original position and continue until the stop valve 4 completely blocks the connecting channel 1c again. It should be noted that the minimum limit of the working gas pressure of the lower gas-using device can be achieved by its throttling device. Another feature of the pressure regulating valve of the present invention is that it is provided with a limit nut 9 that cooperates with the adjusting screw 8 in a spiral structure. Through the limit nut 9, the adjustment position of the adjusting screw 8 or the maximum air pressure threshold corresponding to the adjusting screw 8 can be accurately locked. The limit nut 9 is arranged on the outer side of the adjusting screw 8, that is, the limit nut 9 is on the end of the adjusting screw 8 that is farther away from the balancing piston 2 (see Figure 4 and Figure 5 ), and therefore its position on the adjusting screw 8 can be easily adjusted, thereby achieving the purpose of conveniently regulating and locking the maximum pressure limit of the pressure regulating valve, or flexibly and quickly widening the output pressure limit range of the pressure regulating valve.

[0027] Furthermore, the present invention is provided with a stop nut 11 that is matched with the adjusting screw 8 in a spiral structure, and the stop nut 11 and the limit nut 9 are arranged in an adjacent or adjacent manner (see Figure 4 and Figure 5 ), the setting of the stop nut 11 can reliably lock the position of the limit nut 9 on the adjusting screw 8, thereby effectively controlling and locking the air pressure range value of the pressure regulating valve, thereby ensuring the stable use of air by the lower device. Furthermore, the intermediate piece 10 by which the pressure regulating spring 3 indirectly abuts against the adjusting screw 8 is a gasket-shaped part (such as Figures 3 to 5As shown) or a cylindrical shell part (not shown in the figure), as mentioned above, the purpose of providing the intermediate piece 10 is to reduce the negative impact of frictional rotation on the pressure regulating spring 3 when the adjusting screw 8 is screwed in or out.

[0028] The regulating screw 8 of the pressure regulating valve of the present invention may be provided with a passive constraint structure 8a of a prism structure, a flat groove structure, a convex key structure or a spline structure at its outer end. Figure 3 The passive constraint structure 8a in the embodiment shown is a prism-shaped structure. The purpose of providing the passive constraint structure 8a is to facilitate the adjustment screw 8 to withstand rotational motion without affecting its axial movement, thereby allowing the adjustment screw 8 to rotate in or out relative to the cylinder cover 6 and / or the pressure regulating valve body 1 as needed. In order to achieve the purpose of driving the adjustment screw 8 to rotate in or out, the present invention provides a knob 12 on the pressure regulating valve (see Figures 1 to 6 ), the knob 12 is provided with an active constraint structure 12a (see Figures 4 to 6 ),exist Figures 1 to 6 The active constraint structure 12a adopted by the knob 12 in the illustrated embodiment is a ridge and hole structure that responds to and matches the passive constraint structure 8a on the adjusting screw 8. Obviously, the knob 12 can drive the adjusting screw 8 to rotate with the help of the passive constraint structure 8a through the active constraint structure 12a. At the same time, they cooperate with each other but do not interfere with or restrict the adjusting screw 8 from making axial movement while rotating. In other words, the behavior produced by the active constraint structure 12a of the knob 12 and the passive constraint structure 8a of the adjusting screw 8 is as follows: the knob 12 can drive the adjusting screw 8 to rotate synchronously, and while the two rotate, the adjusting screw 8 can make a telescopic movement relative to the knob 12. Further, a stopper structure 12b is provided on the knob 12, and at the same time on the barrel cover 6 and / or the pressure regulating valve body 1, as shown in FIG. Figure 6 The figure shows the anti-rotation card structure 12b on the knob 12. Figure 3The figure shows a locking structure 12b that can be fastened to the cylinder cover 6. These locking structures 12b are mutually male and female, and can be axially displaced but circumferentially locked. That is, the knob 12 can make a certain amount of axial displacement relative to the cylinder cover 6 and / or the pressure regulating valve body 1. When the relative outward displacement of the two exceeds a certain limit, they disengage from each other, thereby allowing the knob 12 to rotate circumferentially relative to the cylinder cover 6 and / or the pressure regulating valve body 1. When the knob 12 moves closer to each other axially relative to the cylinder cover 6 and / or the pressure regulating valve body 1, so that their locking structures 12b are engaged, the knob 12 rotates relative to the cylinder cover. 6 or / and the pressure regulating valve body 1 cannot rotate circumferentially; in this way, when it is necessary to screw in or out to adjust the gas pressure of the lower device, it is only necessary to pull the knob 12 outward by a certain displacement so that the anti-rotation card structure 12b of the two is disengaged, and the adjustment screw 8 can be screwed in or out by screwing the knob to change the preload force of the pressure regulating spring 3. When the two are close to each other and the knob 12 is meshed with the anti-rotation card structure 12b of the cylinder cover 6 or / and the pressure regulating valve body 1, the current gas pressure of the lower device can be reliably and effectively locked. It should be pointed out that the anti-rotation card structure 12b can be made in an integrated structure with the knob 12 (such as Figure 6 As shown), the anti-rotation card structure 12b can also be made into an integral structure with the cylinder cover 6 and / or the pressure regulating valve body 1 (not shown in the figure). In addition, the anti-rotation card structure 12b can also be made of an independent part and then fastened to the knob 12 (not shown in the figure) or made of an independent part (see Figure 3 ) and then fastened to the cylinder cover 6. Furthermore, the present invention may provide an axial anti-slip hook structure (not shown) on the knob 12 and simultaneously on the cylinder cover 6 and / or the pressure regulating valve body 1. The purpose of providing the axial anti-slip hook structure is to prevent the knob 12 from falling off, particularly to prevent the knob 12 from being excessively pulled out and axially separating from the cylinder cover 6 and / or the pressure regulating valve body 1 when being pulled out.

[0029] An air compressor pressure regulating valve that can easily adjust the pressure setting range value, see Figures 7 to 10 It includes a pressure regulating valve body 1, a balancing piston 2, a pressure regulating spring 3, a stop valve 4, a return spring 5 and a cylinder cover 6. The cylinder cover 6 is fastened to the pressure regulating valve body 1 or the cylinder cover 6 and the pressure regulating valve body 1 are made into an integral structure. Its characteristics are: a cylinder 16 is provided on the pressure regulating valve body 1 and / or the cylinder cover 6. Figures 7 to 9The situation shown is that the cylinder 16 is arranged on the pressure regulating valve body 1, and the balancing piston 2 is built into the cylinder 16 and can be slidably sealed with the cylinder 16. In order to ensure the sealing performance, a sealing ring 2a can be provided on the balancing piston 2; a balancing chamber 7 is constructed on the cylinder 16 and / or the pressure regulating valve body 1, and an intake duct 1a, an exhaust duct 1b and a connecting channel 1c are also provided on the pressure regulating valve body 1. The exhaust duct 1b is always connected to the balancing chamber 7, and the intake duct 1a is connected to the shut-off valve 4 and the connecting channel 1c. 1c and connected to the balancing chamber 7; one end of the return spring 5 abuts on the stop valve 4, and the other end of the return spring 5 abuts on the pressure regulating valve body 1. The force of the return spring 5 always attempts to make the stop valve 4 block the connecting channel 1c and disconnect the air inlet 1a from the balancing chamber 7. In order to position, stabilize and facilitate the installation of the return spring 5, a stop valve seat 4a can be provided; the present invention is provided with an adjusting screw 8, which can be rotatably matched with the cylinder cover 6 and / or the pressure regulating valve body 1 ( Figures 7 to 9 The adjusting screw 8 and the barrel cover 6 can be rotated together). In addition, an axial stop shoulder 8b and an external thread structure section 8c are provided on the adjusting screw 8. At the same time, a passive constraint structure 8a for receiving the rotation drive is provided at the outer end of the adjusting screw 8. The passive constraint structure 8a can be a prism structure (see Figure 7 ), or a spline structure (not shown in the figure) or a slot key structure (not shown in the figure); a shift spring seat 13 is provided, the shift spring seat 13 includes an internal thread structure hole 13a and a first anti-rotation structure 13b, the internal thread structure hole 13a cooperates with the external thread structure section 8c on the adjusting screw 8, the first anti-rotation structure 13b cooperates with the second anti-rotation structure 6a ( Figure 8 and Figure 9The situation shown is that the second anti-rotation structure 6a is provided on the cylinder cover 6) for cooperation. Here, the effect of the cooperation between the first anti-rotation structure 13b and the second anti-rotation structure 6a is: when the adjusting screw 8 makes an inward or outward movement, its movement will be transmitted to the internal threaded structural hole 13a through the external thread structural section 8c. Since the first anti-rotation structure 13b and the second anti-rotation structure 6a limit the rotation of the displacement spring seat 13, the displacement spring seat 13 can only make an axial forward and backward displacement, and finally achieve the effect of further tightening or further relaxing the pressure regulating spring 3. It should be noted that when the adjusting screw 8 makes a rotational movement, the axial stop shoulder 8b on it is restricted by the cylinder cover 6 or the pressure regulating valve body 1 in axial movement (the axial movement is restricted in one direction by them). At the same time, the adjusting screw 8 is pushed by the pressure-adjusting spring 3, so the adjusting screw 8 can only make rotational motion but not axial displacement. This prerequisite also creates the condition for the displacement spring seat 13 to only and must make axial displacement, so that the freedom of this motion is unique, definite and reversible; in addition, a limit screw 14 is provided, which is threadedly matched with the adjusting screw 8 and extends at both ends relative to the adjusting screw 8 in the axial direction. A locking nut 15 is arranged on the outwardly extending threaded section of the limit screw 14 to cooperate with the threaded section; one end of the pressure-adjusting spring 3 directly abuts against the balancing piston 2 or indirectly abuts against the transition piece, and the other end of the pressure-adjusting spring 3 directly abuts against the displacement spring seat 13 or indirectly abuts against the displacement spring seat 13. The pressure regulating principle and structural layout of the embodiment of the present invention are characterized in that the displacement spring seat 13 can be axially displaced relative to the adjusting screw 8 by rotating the adjusting screw 8. The rotation of the adjusting screw 8 can be driven by a tool with the help of the passive constraint structure 8a, or by the active constraint structure 12a provided on the knob 12 (see Figure 10) to drive it. Note that at this time, the pressure-regulating spring 3 and the cylinder cover 6 or the pressure-regulating valve body 1 have an effect and constraint on the axial stop shoulder 8b provided on the adjusting screw 8, so that the adjusting screw 8 can only rotate circumferentially but cannot move axially. Therefore, the shift spring seat 13 will produce an axial shifting movement relative to the adjusting screw 8, thereby further tightening or loosening the pressure-regulating spring 3, that is, the purpose of regulating the gas pressure of the lower device can be achieved. The specific regulation process is similar to the process described in the previous embodiment. The purpose of setting the limit screw 14 in the present invention is to limit the maximum axial displacement of the displacement spring seat 13. That is to say, by rotating the limit screw 14, its protrusion distance relative to the adjusting screw 8 can be adjusted. When the displacement spring seat 13 further compresses the pressure-adjusting spring 3 and is expected to make a larger displacement, it will be limited by it. In other words, by adjusting the limit screw 14, the maximum value of the gas pressure of the lower device can be preset; the purpose of setting the locking nut 15 in the present invention is to effectively prevent the limit screw 14 from loosening, so that the set pressure value threshold can be firmly locked.

[0030] Furthermore, the internal threaded hole 13a of the shift spring seat 13 of the pressure regulating valve is a left-handed thread structure, and the external threaded section 8c of the adjusting screw 8 that cooperates with the internal threaded hole 13a of the shift spring seat 13 is also a left-handed thread structure. The purpose of such a setting is to meet people's operating habits of generally rotating right as the purpose of screwing in and rotating left as the purpose of screwing out. After the above-mentioned two matching auxiliary adjusting screws 8 and the shift spring seat 13 are designed to be left-handed thread structures, when it is necessary to screw in to further compress the pressure regulating spring 3 and make it respond to the higher gas pressure of the lower device, it is only necessary to By rotating the adjusting screw 8 clockwise, the shift spring seat 13 can be displaced away from the axial stop shoulder 8b of the adjusting screw 8, which means that the pressure regulating spring 3 is further compressed or the air pressure of the lower device is increased. In addition, in order to drive the adjusting screw 8 to rotate in or out, the pressure regulating valve of the present invention can also be provided with a knob 12, which is provided with an active constraint structure 12a (see FIG. 1 ) that corresponds to and cooperates with the prism structure, spline structure or slot key structure provided at the outer end of the adjusting screw 8 and can drive the adjusting screw 8 to rotate. Figure 10 ), the active constraint structure 12a cooperates with the passive constraint structure 8a provided at the outer end of the adjusting screw 8. The cooperation between the two enables the adjusting screw 8 to rotate synchronously with the knob 12 when it is rotated. The process by which the knob 12 drives the adjusting screw 8 to rotate in this embodiment is similar to the principle and process described in the previous embodiment.

[0031] Undoubtedly, the outstanding advantages of the present invention compared with the prior art are: a pressure-regulating spring 3 is provided on the pressure-regulating valve, and an adjusting screw 8 and a limiting nut 9 are configured at the same time, or an adjusting screw 8, a shift spring seat 13 and a limiting screw 14 are configured in a structural and layout manner, so that the preload force of the pressure-regulating spring 3 can be accurately adjusted very conveniently, which means that the upper limit value of the gas pressure of the lower device can be adjusted very quickly. In other words, the working pressure zone of the lower device can be flexibly and conveniently converted according to the user object, thereby effectively expanding the adaptability of the pressure-regulating valve to the gas pressure of different lower devices, and realizing the convenient and accurate adjustment of the pressure range value to ensure the consistency of the product, and ultimately achieving the purpose of reducing the production cost of the air compressor pressure regulating valve.

[0032] The above embodiment is only one of the preferred embodiments of the present invention and is not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressure regulating valve for an air compressor capable of conveniently adjusting a pressure setting interval, comprising a pressure regulating valve body, a balancing piston, a pressure regulating spring, a stop valve, a return spring, and a cylinder cover, wherein the cylinder cover is fastened to the pressure regulating valve body or the cylinder cover and the pressure regulating valve body are integrally formed; characterized in that: A cylinder is provided on the pressure regulating valve body or / and the cylinder cover, the balancing piston is built into the cylinder and can be slidably sealed with the cylinder, and a balancing chamber is constructed on the cylinder and / or the pressure regulating valve body; an air inlet, an exhaust duct and a connecting channel are provided on the pressure regulating valve body, the exhaust duct is always connected with the balancing chamber, and the air inlet is connected with the balancing chamber via the stop valve and the connecting channel; one end of the return spring abuts on the stop valve, and the other end of the return spring abuts on the pressure regulating valve body; an adjusting screw is provided, which can be rotatably matched with the cylinder cover and / or the pressure regulating valve body, and an axial stop shoulder and an external threaded structural section are provided on the adjusting screw, and a passive constraint structure for receiving the rotation drive is provided at the outer end of the adjusting screw, and the passive constraint structure is a prism structure, a spline structure or A slot-key structure; a shift spring seat is provided, which includes an internal threaded structural hole and a first anti-rotation structure, the internal threaded structural hole is threadedly matched with the external threaded structural section on the adjusting screw, and the first anti-rotation structure is matched with the second anti-rotation structure provided on the cylinder cover or / and on the pressure regulating valve body; in addition, a limit screw is provided, which is threadedly matched with the adjusting screw and extends at both ends relative to the adjusting screw in the axial direction, and a locking nut is arranged on the outwardly extending threaded section of the limit screw to match the threaded section; one end of the pressure regulating spring directly abuts against the balancing piston or indirectly abuts against the balancing piston via a transition piece, and the other end of the pressure regulating spring directly abuts against the shift spring seat or indirectly abuts against the shift spring seat via a transition piece.

2. The air compressor pressure regulating valve capable of conveniently adjusting the pressure setting interval value according to claim 1, characterized in that: The internal thread structure hole of the displacement spring seat is a left-handed thread structure, and the external thread structure section on the adjusting screw that cooperates with the internal thread structure hole of the displacement spring seat is also a left-handed thread structure; a knob is provided, which is provided with an active constraint structure that corresponds to the prism structure, spline structure or slot key structure provided at the outer end of the adjusting screw and can cooperate with it and drive the adjusting screw to rotate.

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