Pressure regulator and gas tank

Abstract

The utility model relates to a pressure regulator and a gas tank. A pressure regulating unit of the pressure regulator comprises a valve seat, a diaphragm, a valve rod, a first elastic driving device and a second elastic driving device. A valve port of the pressure regulating cavity is formed in the valve seat. The diaphragm forms a movable wall of the pressure regulating chamber. The valve rod and the diaphragm are split components, and the valve rod penetrates through the valve port. The first elastic driving device is connected to the diaphragm at the end, opposite to the valve seat, of the diaphragm. The second elastic driving device is arranged at the end, away from the diaphragm, of the valve rod. When the pressure of the fluid medium in the pressure regulating cavity is smaller than a preset pressure threshold value, the first elastic driving device enables the diaphragm and the valve rod to move towards the second elastic driving device so as to open the valve port. When the pressure of the fluid medium in the pressure adjusting cavity is larger than a preset pressure threshold value, the fluid medium in the pressure adjusting cavity enables the diaphragm to move towards the first elastic driving device, and meanwhile the second elastic driving device enables the valve rod to move towards the first elastic driving device so as to close the valve port. According to the pressure regulator, fatigue damage of the diaphragm, the valve rod and the valve seat is avoided, and parts are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure regulation and control. Specifically, the utility model relates to a pressure regulator and an air box. Background Art

[0002] This section provides background information related to the present application, which does not necessarily constitute prior art.

[0003] A pressure regulator is an intuitive and simple pressure regulation and control device, which is widely used in various fields that require pressure regulation and control. For example, a pressure regulator is required to regulate and control the pressure in an air box for semiconductor equipment.

[0004] Figure 1 The schematic structural diagram of a known pressure regulator 100' is shown. Figure 2 Shown is Figure 1 The partial enlarged schematic diagram of part A in Figure 1 and Figure 2 As shown, the pressure regulator 100' includes a housing 110', a pressure regulation chamber 120' arranged inside the housing 110', an inlet 130' and an outlet 140' which are arranged on the housing 110' and can be in fluid communication with the pressure regulation chamber 120'. In addition, the pressure regulator 100' further includes a pressure regulation unit 200'. Specifically, the pressure regulation unit 200' includes a valve seat 210', a valve stem 220', a diaphragm 230', a piston 240' and a loading spring 250'. A valve port 211' of the pressure regulation chamber 120' is formed on the valve seat 210'. The diaphragm 230' forms a movable wall of the pressure regulation chamber 120'. The valve stem 220' passes through the valve port 211'. The diaphragm 230' is fixedly connected to the valve stem 220'. The piston 240' is connected to the diaphragm 230' at the end of the diaphragm 230' facing away from the valve seat 210' (such as Figure 1 and Figure 2 shown, the upper end of the diaphragm 230'). The loading spring 250' abuts against the end of the piston 240' away from the diaphragm 230'.

[0005] As Figure 1 and Figure 2 shown, in the known pressure regulator 100', when the pressure of the fluid medium in the pressure regulation chamber 120' is less than the predetermined pressure threshold, under the action of the elastic force of the loading spring 250', the diaphragm 230' and the valve stem 220' will move in the direction away from the loading spring 250' ( Figure 1 and Figure 2 shown, the downward direction), so that the valve stem 220' leaves the valve seat 210', thereby opening the valve port 211'. When the pressure of the fluid medium in the pressure regulation chamber 120' is greater than the predetermined pressure threshold, the fluid medium in the pressure regulation chamber 120' will drive the diaphragm 230' in the direction facing the loading spring 250' (Figure 1 and Figure 2 in the upward direction). Since the diaphragm 230' is fixedly connected to the valve stem 220', the valve stem 220' will also move with the diaphragm 230' in the direction facing the loading spring 250', causing the valve stem 220' to abut against the valve seat 210', thereby closing the valve port 211'. After the valve port 211' is closed, the direction of the force exerted by the diaphragm 230' on the valve stem 220' (such as Figure 1 and Figure 2 in the upward direction) is opposite to the direction of the force exerted by the valve seat 210' on the valve stem 220' (such as Figure 1 and Figure 2 in the downward direction). Therefore, the diaphragm 230', the valve stem 220' and the valve seat 210' are prone to fatigue and there is a risk of damage.

[0006] Furthermore, in the known pressure regulator 100', as shown in Figure 1 and Figure 2 , it is necessary to insert the valve stem 220' into the piston 240' and connect the valve stem 220' to the diaphragm 230' through many parts, making the structure of the pressure regulator 100', especially the structure of the piston 240', complex, difficult to machine, and requiring a large number of parts, resulting in high manufacturing costs.

[0007] In addition, as shown in Figure 1 and Figure 2 , in the known pressure regulator 100', the valve stem 220' is only guided by the piston 240' at one end close to the diaphragm 230' and the piston 240', and there is no guidance at the end of the valve stem 220' close to the valve seat 211', so that the valve stem 220' may be skewed during movement, and then the valve port 211' cannot be closed or fully opened.

[0008] In addition, as shown in Figure 1 and Figure 2 , in the known pressure regulator 100', the fluid medium flows directly through the valve port 211' to the diaphragm 230', causing a direct impact on the diaphragm 230', making the diaphragm 230' prone to damage. SUMMARY OF THE UTILITY MODEL

[0009] The object of the present utility model is to solve one or more of the above-mentioned technical problems.

[0010] In particular, the object of the present utility model is to provide a pressure regulator that can avoid damage to the diaphragm, valve stem and valve seat due to fatigue.

[0011] In particular, another object of the present utility model is to provide a pressure regulator that can avoid direct impact of the fluid medium on the diaphragm.

[0012] In particular, the object of the present utility model also lies in providing a pressure regulator capable of providing guidance at both ends of the valve stem.

[0013] According to one aspect of the present utility model, there is provided a pressure regulator. The pressure regulator includes a housing, a pressure regulating chamber provided in the housing, an inlet and an outlet provided on the housing and capable of being in fluid communication with the pressure regulating chamber, and a pressure regulating unit. The pressure regulating unit is characterized in that it includes: a valve seat on which a valve port of the pressure regulating chamber is formed; a diaphragm that forms a movable wall of the pressure regulating chamber; a valve stem that is a separate member from the diaphragm and is provided at one end of the diaphragm facing the valve seat, the valve stem passing through the valve port and being capable of cooperating with the valve seat to open or close the valve port; a first elastic driving device that is connected to the diaphragm at one end of the diaphragm facing away from the valve seat; and a second elastic driving device that is provided at one end of the valve stem away from the diaphragm. When the pressure of the fluid medium in the pressure regulating chamber is less than a predetermined pressure threshold, the first elastic force of the first elastic driving device causes the diaphragm and the valve stem to move towards the second elastic driving device to open the valve port; and when the pressure of the fluid medium in the pressure regulating chamber is greater than the predetermined pressure threshold, the pressure of the fluid medium in the pressure regulating chamber causes the diaphragm to move towards the first elastic driving device, and at the same time, the second elastic force of the second elastic driving device causes the valve stem to move towards the first elastic driving device to close the valve port.

[0014] In the pressure regulator provided by the present utility model, the diaphragm and the valve stem are separate members not connected together, and a second elastic driving device is provided at one end of the valve stem away from the diaphragm. When the pressure of the fluid medium in the pressure regulating chamber is greater than a predetermined pressure threshold, the pressure of the fluid medium in the pressure regulating chamber causes the diaphragm to move in a direction away from the valve seat, and at the same time, the elastic force of the second elastic driving device causes the valve stem to move towards the diaphragm, thereby closing the valve port. When the valve port is closed, the diaphragm does not apply a force opposite to the force applied by the valve seat to the valve stem, avoiding fatigue damage to the diaphragm, the valve stem, and the valve seat. Moreover, since the valve stem does not need to be connected to the diaphragm, it does not need to extend into the piston either. Therefore, the parts for connecting the valve stem and the diaphragm are greatly reduced, the structure of the piston is simplified, the convenience of assembling the pressure regulator is improved, and the manufacturing cost is reduced.

[0015] Optionally, the second elastic driving device is a compression spring, one end of the compression spring abuts against the end of the valve stem away from the diaphragm, and the other end of the compression spring abuts against the housing.

[0016] Optionally, the pressure regulator includes a diaphragm cover. One end of the diaphragm cover is connected to the periphery of the diaphragm, and the other end of the diaphragm cover is connected to the housing sealing surface of the housing. A guiding hole is provided in the diaphragm cover, and the valve stem passes through the guiding hole. The inner diameter of the guiding hole is adapted to the outer diameter of the valve stem to guide the valve stem. The guiding hole can provide a guiding function for the valve stem passing through it, improving the stability and centering of the valve stem and avoiding the situation where the valve port cannot be closed or fully opened due to the skew of the valve stem during movement.

[0017] Optionally, the diaphragm cover includes: an axially-inward flow guiding channel communicating with the valve port; and a plurality of radially-inward flow guiding channels extending from the axially-inward flow guiding channel toward the radial outer side of the diaphragm cover. On the one hand, the plurality of radially-inward flow guiding channels can achieve the function of guiding the flow, reducing the flow dead zone; on the other hand, the plurality of radially-inward flow guiding channels can change the direction of the fluid medium flowing into the pressure regulating chamber, making the fluid medium flow toward the diaphragm in a divergent manner, reducing the frontal impact of the fluid medium on the diaphragm and lowering the risk of diaphragm damage.

[0018] Optionally, the axially-inward flow guiding channel is disposed between the guiding hole and the valve port, and the inner diameter of the axially-inward flow guiding channel is larger than the inner diameter of the guiding hole.

[0019] Optionally, the diaphragm cover includes a plurality of outflow guiding channels fluidly communicating with the pressure regulating chamber. The plurality of outflow guiding channels are beneficial for buffering the fluid medium when it flows out of the pressure regulating chamber, reducing the impact of the fluid medium on the downstream components.

[0020] Optionally, the diaphragm cover includes an annular guiding groove disposed at one end of the diaphragm cover away from the pressure regulating chamber, and the annular guiding groove is fluidly connected to each of the plurality of outflow guiding channels. Due to the provision of the annular guiding groove, when installing the diaphragm cover, it is only necessary to align the annular guiding groove with the through-hole of the flow outlet channel, without specifically adjusting the position of the diaphragm cover to align a certain outflow guiding channel among the discrete outflow guiding channels with the through-hole of the flow outlet channel, which is convenient for installing the diaphragm cover and for the fluid medium to flow toward the through-hole of the flow outlet channel.

[0021] Optionally, the diaphragm cover is provided with a first annular sealing surface cooperating with the diaphragm, and the first annular sealing surface has a chamfered corner. The chamfered corner of the first annular sealing surface can prevent the diaphragm cover from scratching the diaphragm. Additionally, the diaphragm cover is provided with a second annular sealing surface cooperating with the housing sealing surface.

[0022] Optionally, the housing is provided with an inlet flow passage through hole, which is arranged at one end of the valve seat facing away from the diaphragm. The valve stem includes: a sealing section for cooperating with the valve seat; a first guiding section arranged at one end of the sealing section close to the diaphragm, and the outer diameter of the first guiding section is adapted to the inner diameter of the guiding hole; and a second guiding section located at one end of the sealing section away from the diaphragm, and a plurality of cooperating parts for cooperating with the inner wall of the inlet flow passage through hole and step parts located between adjacent cooperating parts are arranged on the second guiding section. Through the cooperation between the cooperating parts and the inner wall of the inlet flow passage through hole, guidance can be provided for the valve stem at the end of the valve stem away from the diaphragm. The step parts are spaced apart from the inner wall of the inlet flow passage through hole, which is beneficial to the diffusion of the fluid medium and reduces the impact of the fluid medium on the downstream components.

[0023] Optionally, the valve stem includes: an abutting section arranged at one end of the second guiding section away from the diaphragm, and the outer diameter of the abutting section is smaller than the outer diameter of the second guiding section, and the abutting section extends into the second elastic driving device. The abutting section extending into the second elastic driving device enables the valve stem to reliably abut against the second elastic driving device.

[0024] Optionally, the pressure regulator includes a sealing auxiliary device arranged between the diaphragm and the inner wall of the housing for assisting in sealing the diaphragm and the diaphragm cover. The sealing auxiliary device includes a sealing ring, one end of the sealing ring contacts one end of the diaphragm away from the valve seat, and the other end of the sealing ring contacts the inner wall of the housing. During assembly, the inner wall of the housing (such as the valve cap) presses against the sealing ring by the torque applied to the housing, and the sealing ring presses against the diaphragm, so as to form a seal between the diaphragm and the diaphragm cover, and a seal between the diaphragm cover and the valve body. The sealing ring arranged between the diaphragm and the housing can prevent the diaphragm from directly contacting the housing and avoid damaging the diaphragm. Especially when the housing includes a valve body and a valve cap connected by threads, the sealing ring arranged between the diaphragm and the housing can prevent the inner wall of the valve cap from wearing the diaphragm when the valve cap rotates during the screw engagement of the valve cap and the valve body during assembly, especially avoiding the inner wall of the valve cap wearing the diaphragm when the torque applied to the valve cap makes the threads of the valve cap and the valve body tightened during assembly.

[0025] Optionally, the first elastic driving device includes: a piston connected to the diaphragm at an end of the diaphragm facing away from the valve seat; an abutting member; and a first elastic member, one end of the first elastic member abuts against the piston, and the other end of the first elastic member abuts against the abutting member; wherein, the piston is located in the sealing ring, an annular sealing groove is provided on the inner wall of the sealing ring, and a sealing ring and a retaining ring are provided in the sealing groove. Through the combined setting of the sealing ring and the retaining ring, on the one hand, damping can be provided to prevent unnecessary relative movement of the piston relative to the sealing ring, especially unnecessary relative movement of parts caused by external environmental reasons such as vibration and shaking; on the other hand, it can provide a guiding function for the movement of the piston when the pressure regulator works normally, so that the piston moves along a predetermined direction without skew.

[0026] According to another aspect of the present invention, there is also provided an air tank, and the air tank includes any one of the above pressure regulators. Therefore, the air tank also has the corresponding technical effects as described above. For the sake of brevity, it will not be repeated here. Description of the Drawings

[0027] According to the following detailed description with reference to the drawings, the foregoing and additional features and characteristics of the present application will become more apparent. These drawings are only for illustration and are not necessarily drawn to scale. The same reference numerals are used in the drawings to indicate the same components. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a known pressure regulator;

[0029] Figure 2 is Figure 1 a partial enlarged schematic diagram of part A in

[0030] Figure 3 is a schematic structural diagram of a pressure regulator according to a preferred embodiment of the present invention, wherein the valve port of the pressure regulating chamber of the pressure regulator is in a fully open state;

[0031] Figure 4 is another schematic structural diagram of a pressure regulator according to a preferred embodiment of the present invention, wherein the valve port of the pressure regulating chamber of the pressure regulator is in a closed state;

[0032] Figure 5 is still another schematic structural diagram of a pressure regulator according to a preferred embodiment of the present invention, wherein the pressure setting member of the pressure regulator is in the top position;

[0033] Figure 6 is a top view schematic diagram of the diaphragm cover of a pressure regulator according to a preferred embodiment of the present invention;

[0034] Figure 7It is a bottom view schematic diagram of a diaphragm cover of a pressure regulator according to a preferred embodiment of the present invention;

[0035] Figure 8 It is a cross-sectional schematic diagram of a diaphragm cover of a pressure regulator according to a preferred embodiment of the present invention;

[0036] Figure 9 It is a structural schematic diagram of a valve stem of a pressure regulator according to a preferred embodiment of the present invention; and

[0037] Figure 10 It is a top view schematic diagram of a valve stem of a pressure regulator according to a preferred embodiment of the present invention. Specific Embodiments

[0038] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the present invention and its application or use.

[0039] The present invention provides a pressure regulator, which can be used for a gas box. The gas box can be, for example, a gas box for semiconductor equipment.

[0040] Figure 3 , Figure 4 and Figure 5 are respectively structural schematic diagrams of a pressure regulator 100 according to a preferred embodiment of the present invention in different states. Below, the structure of the pressure regulator 100 according to a preferred embodiment of the present invention will be described in detail with reference to Figures 3 to 5 The structure of the pressure regulator 100 according to a preferred embodiment of the present invention will be described in detail.

[0041] As Figures 3 to 5As shown, the voltage regulator 100 includes a housing 110. The housing 110 can generally be made of a rigid material. The housing 110 includes a valve body 111 and a valve cap 112 that are detachably assembled together. For example, in a preferred embodiment of the present utility model, the valve body 111 and the valve cap 112 are threadedly connected. A pressure regulating chamber 120 is provided inside the housing 110. An inlet 130 and an outlet 140 are provided on the housing 110. The inlet 130 and the outlet 140 can be in fluid communication with the pressure regulating chamber 120. Specifically, in a preferred embodiment of the present utility model, the upstream of the pressure regulating chamber 120 is in fluid communication with the inlet 130, and the downstream of the pressure regulating chamber 120 is in fluid communication with the outlet 140. For example, the pressure regulating chamber 120 is in fluid communication with the inlet 130 via an inlet flow passage through hole 150; the pressure regulating chamber 120 is in fluid communication with the outlet 140 via an outlet flow passage through hole 160. The voltage regulator 100 further includes a pressure regulating unit 200 for regulating the pressure of the fluid medium in the pressure regulating chamber 120. The fluid medium from an external pipeline (not shown) enters the pressure regulating chamber 120 through the inlet 130 on the housing 110 of the voltage regulator 100, and after being regulated by the pressure regulating unit 200 in the pressure regulating chamber 120, flows out from the outlet 140 at a desired pressure. The fluid medium can be a gas or a liquid.

[0042] As Figures 3 to 5 shown, in a preferred embodiment of the present utility model, the pressure regulating unit 200 includes a valve seat 210, a valve stem 220, a diaphragm 230, a piston 240, a first elastic member 250, a contact member 260, and a second elastic member 270. Among them, the piston 240, the first elastic member 250, and the contact member 260 together constitute an example of a "first elastic driving device 280". The second elastic member 270 constitutes an example of a "second elastic driving device". Preferably, the pressure regulating unit 200 further includes a pressure setting member 290 for setting a desired predetermined pressure threshold. The following will be combined with Figures 3 to 5 to describe the pressure regulating unit 200 in detail.

[0043] As Figures 3 to 5 shown, a valve port 211 of the pressure regulating chamber 120 is formed on the valve seat 210. The valve port 211 is an inlet for the fluid medium to flow into the pressure regulating chamber 120. The diaphragm 230 can be flexible. The diaphragm 230 forms a movable wall of the pressure regulating chamber 120. The valve stem 220 and the diaphragm 230 are separate components and are provided at one end of the diaphragm 230 facing the valve seat 210 ( Figures 3 to 5 the lower end of the diaphragm 230 shown in). That is to say, the valve stem 220 can abut against the diaphragm 230 but is not connected to the diaphragm 230 at one end of the diaphragm 230 facing the valve seat 210. The valve stem 220 passes through the valve port 211 and can cooperate with the valve seat 210 to open or close the valve port 211. Figure 3A schematic diagram showing the valve port 211 of the pressure regulating chamber 120 of the pressure regulator 100 in a fully open state is shown. In Figure 3 , the valve stem 220 is separated from the valve seat 210, and the valve port 211 is in a fully open state. At this time, the fluid medium can enter the pressure regulating chamber 120 through the valve port 211 as indicated by the arrow. Figure 4 A schematic diagram showing the valve port 211 of the pressure regulating chamber 120 of the pressure regulator 100 in a closed state is shown. In Figure 4 , the valve stem 220 abuts against the valve seat 210. Specifically, the sealing section 221 of the valve stem 220 abuts against the valve seat 210, and the valve port 211 is in a closed state. At this time, the fluid medium cannot enter the pressure regulating chamber 120 through the valve port 211.

[0044] As Figures 3 to 5 shown, the first elastic driving device 280 is connected to the diaphragm 230 at one end of the diaphragm 230 facing away from the valve seat 210 or the pressure regulating chamber 120 ( Figures 3 to 5 the upper end of the diaphragm 230 shown in ). As an example of the "second elastic driving device", the second elastic member 270 is provided at one end of the valve stem 220 away from the diaphragm 230 ( Figures 3 to 5 the lower end of the valve stem 220 shown in ). When the pressure of the fluid medium in the pressure regulating chamber 120 is less than the predetermined pressure threshold, the elastic force of the first elastic driving device 280 (i.e., the "first elastic force") causes the diaphragm 230 and the valve stem 220 to move towards the second elastic driving device ( Figures 3 to 5 the downward direction shown in ) to open the valve port 211. When the pressure of the fluid medium in the pressure regulating chamber 120 is greater than the predetermined pressure threshold, the pressure of the fluid medium in the pressure regulating chamber 120 causes the diaphragm 230 to move towards the first elastic driving device 280, and at the same time, the elastic force of the second elastic driving device (i.e., the "second elastic force") causes the valve stem 220 to move towards the first elastic driving device 280 ( Figures 3 to 5 the upward direction shown in ) to close the valve port 211.

[0045] Specifically, in a preferred embodiment of the present utility model, a piston 240, a first elastic member 250, and an abutting member 260 are sequentially arranged at one end of the diaphragm 230 facing away from the valve seat 210 or the pressure regulating chamber 120. The piston 240 is connected to the diaphragm 230 at one end of the diaphragm 230 facing away from the valve seat 210 or the pressure regulating chamber 120. The first elastic member 250 can be a compression spring. Of course, the first elastic member 250 can also be other elastic components. One end of the first elastic member 250 abuts against the piston 240, and the other end abuts against the abutting member 260. One end of a second elastic member 270, which is an example of the "second elastic driving device", abuts against one end of the valve stem 220 away from the diaphragm 230, and the other end of the second elastic member 270 abuts against the housing 110. Specifically, in a preferred embodiment of the present utility model, the other end of the second elastic member 270 abuts against the inner wall of the valve body 111. The second elastic member 270 can be a compression spring. Of course, the second elastic member 270 can also be other elastic components.

[0046] The diaphragm 230 can sense the pressure of the fluid medium in the pressure regulating chamber 120 and transmit the pressure of the fluid medium to the first elastic member 250 through the piston 240. When the pressure of the fluid medium in the pressure regulating chamber 120 is less than a predetermined pressure threshold, the first elastic member 250 will drive the diaphragm 230 connected to the piston 240 to move towards the second elastic member 270 via the piston 240, and then drive the valve stem 220 located at the end of the diaphragm 230 facing the valve seat 210 to move in the same direction, so that the valve stem 220 moves away from the valve orifice 211 to open the valve orifice 211. When the pressure of the fluid medium in the pressure regulating chamber 120 is greater than the predetermined pressure threshold, the fluid medium in the pressure regulating chamber 120 will drive the diaphragm 230 to move in a direction away from the second elastic member 270. Since the diaphragm 230 and the valve stem 220 are separate components, the valve stem 220 arranged at the end of the diaphragm 230 facing the valve seat 210 will not move together with the diaphragm 230. However, the elastic force of the second elastic member 270 abutting against the end of the valve stem 220 away from the diaphragm 230 will drive the valve stem 220 to move towards the first elastic driving device 280, so that the valve stem 220 abuts against the valve seat 210 to close the valve orifice 211.

[0047] As Figures 3 to 5 shown, preferably, a pressure setting member 290 abuts against the end of the abutting member 260 opposite to the first elastic member 250. The pressure setting member 290 can be an adjusting bolt passing through the housing 110. Specifically, in a preferred embodiment of the present utility model, the pressure setting member 290 is an adjusting bolt passing through the valve cap 112. The predetermined pressure threshold can be set through the pressure setting member 290. Figure 5A schematic diagram is shown when the pressure setting member 290 is at the top. At this time, the first elastic member 250 is in a released state and has no elastic force. At this time, the predetermined pressure threshold is the smallest. When the pressure setting member 290 is moved downward, the first elastic member 250 is gradually compressed, so that the predetermined pressure threshold increases. In addition, in Figure 5 , the second elastic member 270 is in a compressed state, and its elastic force causes the valve stem 220 to abut against the valve seat 210 to close the valve port 211. The user can adjust the pressure setting member 290 as needed to adjust the compression amount of the first elastic member 250, so as to set the desired pressure threshold.

[0048] Preferably, as Figures 3 to 5 shown, the pressure regulator 100 further includes a handle 170, which is sleeved on the housing 110 and can move relative to the housing 110. Specifically, in a preferred embodiment of the present invention, the handle 170 is sleeved on the valve cap 112. The pressure setting member 290 passes through both the valve cap 112 and the handle 170. One end of the pressure setting member 290 abuts against the abutting member 260, and the other end is locked to the handle 170 through a locking member 291. The locking member 291 can be a lock nut. An annular first handle groove 171 is provided on the inner wall of the handle 170, and a handle sealing ring 172 is accommodated in the first handle groove 171. The handle sealing ring 172 cooperates with the valve cap 112. On the one hand, it can provide sealing performance, and on the other hand, it can provide guidance for the movement of the handle 170 and the pressure setting member 290. A second handle groove 173 and a handle cover 174 for covering the second handle groove 173 are provided at one end of the handle 170 away from the abutting member 260. A label paper 175 is provided on the handle cover 174 to show the relevant information of the pressure regulator 100. The locking member 291 can be accommodated in the second handle groove 173 and covered by the handle cover 174, so that the locking member 291 can be prevented from being exposed, and the set predetermined pressure threshold can be prevented from being inadvertently touched during use.

[0049] Preferably, as Figures 3 to 5 shown, the pressure regulator 100 further includes a diaphragm cover 300. The diaphragm cover 300 is disposed between the valve seat 210 and the diaphragm 230. One end of the diaphragm cover 300 is connected to the periphery of the diaphragm 230 to support the diaphragm 230. The other end of the diaphragm cover 300 is connected to the housing sealing surface of the housing 110. The diaphragm cover 300, the valve seat 210 and the diaphragm 230 enclose a pressure regulating chamber 120. As described above, when the pressure of the fluid medium in the pressure regulating chamber 120 is less than the predetermined pressure threshold, the diaphragm 230 will be driven by the elastic force of the first elastic driving device 280 towards the second elastic driving device ( Figures 3 to 5Move in the downward direction (shown in the figure). It can be understood that since the peripheral edge of the diaphragm 230 is connected to the diaphragm cover 300, only the middle part of the diaphragm 230 moves. When the middle part of the diaphragm 230 moves to contact the diaphragm cover 300, as Figure 3 shown, the valve port 211 is in the fully open position.

[0050] Figure 6 is a top view schematic diagram of the diaphragm cover 300 of the pressure regulator 100 according to a preferred embodiment of the present invention. Figure 7 is a bottom view schematic diagram of the diaphragm cover 300 of the pressure regulator 100 according to a preferred embodiment of the present invention. Figure 8 is a cross-sectional schematic diagram of the diaphragm cover 300 of the pressure regulator 100 according to a preferred embodiment of the present invention. The following will be combined with Figures 6 to 8 to describe in detail the diaphragm cover 300 of the pressure regulator 100 according to a preferred embodiment of the present invention.

[0051] As Figures 6 to 8 shown, a guide hole 310 is provided in the diaphragm cover 300, and the valve stem 220 can pass through the guide hole 310. The inner diameter of the guide hole 310 is adapted to the outer diameter of the valve stem 220. Specifically, the inner diameter of the guide hole 310 can be slightly larger than the outer diameter of the part of the valve stem 220 that will pass through the guide hole 310 during the movement of the valve stem 220, so that the valve stem 220 can move along the axial direction of the valve stem 220 in the guide hole 310 without skew. The guide hole 310 can provide a guiding function for the valve stem 220 passing through the guide hole 310, improving the stability and centering of the valve stem 220, and avoiding the situation that the valve port 211 cannot be closed or cannot be fully opened due to the skew of the valve stem 220 during the movement.

[0052] Further preferably, the diaphragm cover 300 is also configured to change the flow direction of the fluid medium flowing into the pressure regulating chamber 120 from the valve port 211. Specifically, as Figures 6 to 8As shown, the diaphragm cover 300 includes an axially-inward flow guiding channel 320 and a plurality of radially-inward flow guiding channels 330. The axially-inward flow guiding channel 320 is in fluid communication with the valve port 211. The axially-inward flow guiding channel 320 is disposed between the guiding hole 310 and the valve port 211. The valve stem 220 passes through the valve port 211, the axially-inward flow guiding channel 320, and the guiding hole 310. The inner diameter of the axially-inward flow guiding channel 320 is larger than that of the guiding hole 310, such that the fluid medium from the valve port 211 can flow in through the axially-inward flow guiding channel 320. The axially-inward flow guiding channel 320 and the guiding hole 310 may be located at the exact center of the diaphragm cover 300. The plurality of radially-inward flow guiding channels 330 extend from the axially-inward flow guiding channel 320 towards the radially outer side of the diaphragm cover 300. One end of the radially-inward flow guiding channel 330 is in communication with the axially-inward flow guiding channel 320, and the other end is in communication with the pressure regulating chamber 120. The plurality of radially-inward flow guiding channels 330 may extend horizontally radially outwards from the axially-inward flow guiding channel 320, or may extend radially outwards obliquely. For example, the axes of the plurality of oblique radially-inward flow guiding channels 330 form an acute angle with the axis of the axially-inward flow guiding channel 320 (i.e., the axis of the diaphragm cover 300). Preferably, the plurality of radially-inward flow guiding channels 330 may be evenly distributed in the circumferential direction of the diaphragm cover 300. For example, in a preferred embodiment of the present utility model, three radially-inward flow guiding channels 330 are evenly provided in the circumferential direction of the diaphragm cover 300. After the fluid medium flows out from the valve port 211, it first passes through the axially-inward flow guiding channel 320 in the diaphragm cover 300, and then flows towards the pressure regulating chamber 120 through the plurality of radially-inward flow guiding channels 330 that are in fluid communication with the axially-inward flow guiding channel 320. On the one hand, the plurality of radially-inward flow guiding channels 330 can achieve the function of guiding the flow and reduce the flow dead zone; on the other hand, the plurality of radially-inward flow guiding channels 330 can change the direction of the fluid medium flowing into the pressure regulating chamber 120, such that the fluid medium flows towards the diaphragm in a divergent manner, reducing the frontal impact of the fluid medium on the diaphragm and reducing the risk of diaphragm damage.

[0053] As Figures 6 to 8 shown, the diaphragm cover 300 includes a plurality of outflow guiding channels 340. The outflow guiding channels 340 are in fluid communication with the pressure regulating chamber 120, and the fluid medium in the pressure regulating chamber 120 flows out through the plurality of outflow guiding channels 340 on the diaphragm cover 300. For example, in a preferred embodiment of the present utility model, the diaphragm cover 300 includes four outflow guiding channels 340, and these four outflow guiding channels 340 are evenly arranged in the circumferential direction of the diaphragm cover 300. The plurality of outflow guiding channels 340 are beneficial for buffering the fluid medium when the fluid medium flows out from the pressure regulating chamber 120 and reducing the impact of the fluid medium on the downstream components.

[0054] As Figures 6 to 8As shown, an annular flow guide groove 350 is provided at one end of the diaphragm cover 300 away from the pressure regulating chamber 120. The annular flow guide groove 350 is arranged along the entire circumference of the diaphragm cover 300. One end of the annular flow guide groove 350 close to the pressure regulating chamber 120 is in fluid communication with each outflow guide channel 340. The fluid medium in each outflow guide channel 340 can converge in the annular flow guide groove 350. One end of the annular flow guide groove 350 away from the pressure regulating chamber 120 is in fluid communication with the outflow port flow channel through hole 160 provided in the housing 110. Due to the provision of the annular flow guide groove 350, when installing the diaphragm cover 300, it is only necessary to align the annular flow guide groove 350 with the outflow port flow channel through hole 160, without specifically adjusting the position of the diaphragm cover 300 to align a certain one of the discrete outflow guide channels 340 with the outflow port flow channel through hole 160, which facilitates the installation of the diaphragm cover 300 and the flow of the fluid medium to the outflow port flow channel through hole 160.

[0055] Preferably, as Figures 6 to 8 shown, a first annular sealing surface 360 is provided on the diaphragm cover 300. The first annular sealing surface 360 cooperates with the diaphragm 230 to form a seal between the diaphragm 230 and the diaphragm cover 300. The diaphragm cover 300 is usually made of a metal material. The first annular sealing surface 360 has a chamfered edge, which can prevent the diaphragm cover 300 from scratching the diaphragm 230. In addition, a second annular sealing surface 370 is also formed on the diaphragm cover 300. The second annular sealing surface 370 is provided on the radially outer side of the annular flow guide groove 350 and at one end opposite to the first annular sealing surface 360, and is used to cooperate with the housing sealing surface on the housing 110 to form a seal between the diaphragm cover 300 and the housing 110. The second annular sealing surface 370 can also have a chamfered edge.

[0056] Return to reference Figures 3 to 5, preferably, the pressure regulator 100 includes a sealing auxiliary device 400 disposed between the diaphragm 230 and the inner wall of the housing 110 for assisting in sealing the diaphragm 230 and the diaphragm cover 300. Specifically, in a preferred embodiment of the present invention, the sealing auxiliary device 400 is disposed between the diaphragm 230 and the inner wall of the valve cap 112. The sealing auxiliary device 400 includes an annular sealing ring 410. One end of the sealing ring 410 contacts the end of the diaphragm 230 away from the valve seat 210, and the other end of the sealing ring 410 contacts the inner wall of the housing 110 (such as the valve cap 112). The sealing ring 410 can be supported by the diaphragm cover 300 together with the diaphragm 230. The diaphragm 230 is sandwiched between the sealing ring 410 and the diaphragm cover 300. The valve cap 112 acts on the diaphragm 230 and the diaphragm cover 300 through the sealing ring 410. By applying torque to the valve cap 112, a seal can be formed between the diaphragm cover 300 and the diaphragm 230 and between the diaphragm cover 300 and the housing 110, especially at the first annular sealing surface 360 and the second annular sealing surface 370, thereby preventing the leakage of the fluid medium. The sealing ring 410 disposed between the diaphragm 230 and the housing 110 can prevent the diaphragm 230 from directly contacting the housing 110, and can prevent the inner wall of the valve cap 112 from wearing the diaphragm 230 when the valve cap 112 rotates during the screw engagement of the valve cap 112 and the valve body 111 during assembly, avoiding damage to the diaphragm 230, especially avoiding the inner wall of the valve cap 112 from wearing the diaphragm 230 when the valve cap 112 rotates during the screw tightening of the valve cap 112 and the valve body 111 by the torque applied to the valve cap 112 during assembly, and avoiding damage to the diaphragm 230. The piston 240 is located in the annular sealing ring 410. An annular sealing groove (not shown in the drawing reference numerals) is provided on the inner wall of the sealing ring 410, and a first piston sealing ring 420 and a retaining ring 430 are provided in the annular sealing groove. The first piston sealing ring 420 and the retaining ring 430 are arranged along the radial direction of the sealing auxiliary device 400. Among them, the first piston sealing ring 420 is disposed radially outside the retaining ring 430, that is, the retaining ring 430 directly contacts the piston 240 disposed in the sealing ring 410. Through the combined setting of the first piston sealing ring 420 and the retaining ring 430, on the one hand, damping can be provided to prevent unnecessary relative movement of the piston 240 relative to the sealing ring 410, especially unnecessary relative movement of parts caused by external environmental reasons such as vibration and shaking; on the other hand, it can provide a guiding function for the movement of the piston 240 when the pressure regulator 100 works normally, so that the piston 240 moves along a predetermined direction without skew.

[0057] In addition, a piston annular groove 241 is provided at one end of the piston 240 away from the seal assisting device 400, and a second piston sealing ring 242 is arranged in the piston annular groove 241. The second piston sealing ring 242 cooperates with the housing 110. Specifically, in a preferred embodiment of the present invention, the second piston sealing ring 242 cooperates with the valve cap 112 to provide guidance for the movement of the piston 240 at the other end of the piston 240. One end of the first elastic member 250 abutting against the piston 240 extends into the piston 240 to provide guidance for the movement of the first elastic member 250 through the piston 240. The other end of the first elastic member 250 is guided by the housing 110, specifically, by the valve cap 112.

[0058] As described above, by providing the guiding hole 310 in the diaphragm cover 300, guidance can be provided for one end of the valve rod 220 close to the diaphragm 230. Preferably, in a preferred embodiment of the present invention, through the structural design of the valve rod 220, guidance can also be provided at the end of the valve rod 220 away from the diaphragm 230. Figure 9 It is a schematic structural view of the valve rod 220 of the pressure regulator 100 according to a preferred embodiment of the present invention. Figure 10 It is a top view schematic of the valve rod 220 of the pressure regulator 100 according to a preferred embodiment of the present invention. Next, in conjunction with Figure 9 and Figure 10 The valve rod 220 according to a preferred embodiment of the present invention will be described in detail.

[0059] As Figure 9 and Figure 10As shown, the valve stem 220 includes a sealing section 221, a first guiding section 222 located at one end of the sealing section 221 close to the diaphragm 230, a second guiding section 223 located at one end of the sealing section 221 away from the diaphragm 230, and an abutting section 224 located at one end of the second guiding section 223 away from the diaphragm 230. The sealing section 221 is used to cooperate with the valve seat 210 to close the valve port 211. Preferably, the sealing section 221 has a generally conical cross-section, and the diameter of the sealing section 221 gradually increases from the end close to the diaphragm 230 towards the end away from the diaphragm 230, so as to provide reliable sealing when abutting against the valve seat 210 to close the valve port 211. The first guiding section 222 is used to cooperate with the guiding hole 310 in the diaphragm cover 300, so the outer diameter of the first guiding section 222 is adapted to the inner diameter of the guiding hole 310. Specifically, the outer diameter of the first guiding section 222 is slightly smaller than the inner diameter of the guiding hole 310, so that the first guiding section 222 can move along the axial direction of the valve stem 220 in the guiding hole 310 without skew. A plurality of cooperating portions 226 for cooperating with the inner wall of the inlet flow passage through hole 150 and step portions 225 located between adjacent cooperating portions 226 are provided on the second guiding section 223. The cooperating portions 226 can contact the inner wall of the inlet flow passage through hole 150 or be slightly spaced apart from the inner wall of the inlet flow passage through hole 150. Through the cooperation between the cooperating portions 226 and the inner wall of the inlet flow passage through hole 150, guidance can be provided for the valve stem 220 at the end of the valve stem 220 away from the diaphragm 230. The step portions 225 are spaced apart from the inner wall of the inlet flow passage through hole 150, which is beneficial to the diffusion of the fluid medium and reduces the impact of the fluid medium on the downstream components. The step portions 225 can be formed by cutting a part of the second guiding section 223 into a plane. Figure 10 Three uniformly distributed step portions 225 are shown. The abutting section 224 is provided at one end of the second guiding section 223 away from the diaphragm 230. The outer diameter of the abutting section 224 is smaller than the outer diameter of the second guiding section 223. The abutting section 224 extends into the second elastic member 270 serving as the second elastic driving device, so that the valve stem 220 can reliably abut against the second elastic member 270.

[0060] In summary, the diaphragm 230 and the valve stem 220 of the voltage regulator 100 provided by the present utility model are separate components that are not connected together, and a second elastic driving device (such as the second elastic member 270) is provided at one end of the valve stem 220 away from the diaphragm 230. When the pressure of the fluid medium in the pressure regulating chamber 120 is greater than a predetermined pressure threshold, the elastic force of the second elastic driving device causes the valve stem 220 to move towards the diaphragm 230, thereby closing the valve port 211. When the valve port 211 is closed, the diaphragm 230 does not apply a force opposite to the force applied by the valve seat 210 to the valve stem 220, avoiding fatigue damage to the diaphragm 230, the valve stem 220, and the valve seat 210. Moreover, since the valve stem 220 does not need to be connected to the diaphragm 230, it does not need to extend into the piston 240 either. Therefore, the parts for connecting the valve stem 220 and the diaphragm 230 are greatly reduced, the structure of the piston 240 is simplified, the convenience of assembling the voltage regulator 100 is improved, and the manufacturing cost is reduced.

[0061] In addition, by improving the structure of the diaphragm cover 300, a plurality of radial inflow diversion channels 330 communicating with the axial inflow diversion channel 320 are added. On the one hand, the diversion function can be realized, reducing the flow dead zone. On the other hand, the flow direction of the fluid medium is changed, so that the fluid medium flows towards the pressure regulating chamber 120 and the diaphragm 230 in a divergent manner, reducing the frontal impact of the fluid medium on the diaphragm 230 and reducing the risk of damage to the diaphragm 230.

[0062] Furthermore, a guide hole 310 that cooperates with the first guiding section 222 of the valve stem 220 is provided in the diaphragm cover 300, which can provide guidance for one end of the valve stem 220 close to the diaphragm 230. Through the cooperation part 226 of the second guiding section 223 of the valve stem 220 and the inner wall of the inlet flow passage through hole 150, guidance can be provided for the end of the valve stem 220 away from the diaphragm 230. Therefore, the valve stem 220 is guided at both ends, so that the valve stem 220 will not be skewed during the process of moving axially to open or close the valve port 211, improving the stability and centering of the valve stem 220 and avoiding the situation where the valve port 211 cannot be closed or fully opened. The fluid medium can obtain a stable outlet pressure after being regulated by the pressure regulating unit 200.

[0063] The above describes the voltage regulator according to the preferred embodiment of the present utility model in combination with specific implementation manners. It can be understood that the above description is only exemplary and not restrictive. Without departing from the scope of the present utility model, those skilled in the art can think of various variations and modifications with reference to the above description. These variations and modifications are also included in the protection scope of this application.

Claims

1. A pressure regulator, comprising a housing, a pressure regulating chamber arranged in the housing, an inlet and an outlet arranged on the housing and capable of communicating with the pressure regulating chamber fluid, and a pressure regulating unit, characterized in that: The voltage regulating unit comprises: a valve seat, on which a valve port of the pressure regulating chamber is formed; a diaphragm forming a movable wall of the pressure regulating chamber; A valve stem, which is a separate component from the diaphragm and is disposed at one end of the diaphragm facing the valve seat, and the valve stem passes through the valve port and can cooperate with the valve seat to open or close the valve port; a first elastic drive device connected to the diaphragm at an end of the diaphragm facing away from the valve seat; and a second elastic driving device, the second elastic driving device being arranged at an end of the valve stem away from the diaphragm; Wherein, when the pressure of the fluid medium in the pressure regulating chamber is less than a predetermined pressure threshold, the first elastic force of the first elastic driving device causes the diaphragm and the valve stem to move toward the second elastic driving device to open the valve port; and When the pressure of the fluid medium in the pressure regulating chamber is greater than the predetermined pressure threshold, the pressure of the fluid medium in the pressure regulating chamber causes the diaphragm to move toward the first elastic driving device, and at the same time, the second elastic force of the second elastic driving device causes the valve stem to move toward the first elastic driving device to close the valve port.

2. The voltage regulator according to claim 1, characterized in that: The second elastic driving device is a compression spring, one end of the compression spring abuts against an end of the valve stem away from the diaphragm, and the other end of the compression spring abuts against the housing.

3. The voltage regulator according to claim 1 or 2, characterized in that: The pressure regulator includes a diaphragm cover, one end of which is connected to the periphery of the diaphragm, and the other end of which is connected to the shell sealing surface of the shell. A guide hole is provided in the diaphragm cover, and the valve stem passes through the guide hole. The inner diameter of the guide hole is adapted to the outer diameter of the valve stem to guide the valve stem.

4. The voltage regulator according to claim 3, characterized in that: The diaphragm cover comprises: an axial inflow guide channel, the axial inflow guide channel being in communication with the valve port; and A plurality of radial inflow guide channels extend from the axial inflow guide channel toward the radial outer side of the diaphragm cover.

5. The voltage regulator according to claim 4, characterized in that: The axial inflow guide channel is arranged between the guide hole and the valve port, and the inner diameter of the axial inflow guide channel is larger than the inner diameter of the guide hole.

6. The voltage regulator according to claim 3, characterized in that: The diaphragm cover includes a plurality of outflow guiding channels, and the plurality of outflow guiding channels are in fluid communication with the pressure regulating chamber.

7. The voltage regulator according to claim 6, characterized in that: The diaphragm cover comprises an annular guide groove, which is arranged at one end of the diaphragm cover away from the pressure regulating chamber, and the annular guide groove is in fluid communication with each of the plurality of outflow guide channels.

8. The voltage regulator according to claim 3, characterized in that: The diaphragm cover is provided with a first annular sealing surface matched with the diaphragm, and the first annular sealing surface is rounded; and the diaphragm cover is provided with a second annular sealing surface matched with the housing sealing surface.

9. The voltage regulator according to claim 3, characterized in that: The housing is provided with an inlet flow channel through hole, and the inlet flow channel through hole is arranged at an end of the valve seat facing away from the diaphragm, and the valve stem includes: a sealing section, the sealing section being used to cooperate with the valve seat; a first guide section, the first guide section being disposed at one end of the sealing section close to the diaphragm, the outer diameter of the first guide section being adapted to the inner diameter of the guide hole; and The second guide section is located at one end of the sealing section away from the diaphragm, and is provided with a plurality of matching parts matching with the inner wall of the inlet flow channel through hole and step parts located between adjacent matching parts.

10. The voltage regulator according to claim 9, characterized in that The valve stem comprises: The abutment section is arranged at one end of the second guide section away from the diaphragm, the outer diameter of the abutment section is smaller than the outer diameter of the second guide section, and the abutment section extends into the second elastic drive device.

11. The voltage regulator according to claim 3, characterized in that: The pressure regulator includes a sealing auxiliary device arranged between the diaphragm and the inner wall of the shell for assisting the sealing of the diaphragm and the diaphragm cover, the sealing auxiliary device includes a sealing ring, one end of the sealing ring is in contact with the end of the diaphragm away from the valve seat, and the other end of the sealing ring is in contact with the inner wall of the shell.

12. The voltage regulator according to claim 11, characterized in that The first elastic driving device comprises: a piston connected to the diaphragm at an end of the diaphragm facing away from the valve seat; an abutment; and a first elastic member, one end of the first elastic member abuts against the piston, and the other end of the first elastic member abuts against the abutting member; Wherein, the piston is located in the sealing ring, an annular sealing groove is arranged on the inner wall of the sealing ring, and a sealing ring and a retaining ring are arranged in the sealing groove.

13. An air box, characterized in that: The gas tank comprises a pressure regulator according to any one of claims 1 to 12.

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