Air filtering pressure reducing valve

Abstract

The utility model discloses an air filtering pressure reducing valve which is characterized by further comprising a shell installed on a valve body, a filter screen installed in the shell and a flow guide disc which is installed between the valve body and the filter screen and plays a role in rotational flow guiding of gas entering the shell, and a plurality of flow guide blades are arranged on the flow guide disc. The valve body is provided with a valve cavity, an inlet communicated with the shell and an outlet communicated with the valve cavity. According to the utility model, the flow guide disc is arranged in the shell, so that when gas enters the shell through the inlet, the flow guide disc has a flow guide effect on the entering gas, and the gas forms rotational flow in the shell along the flow guide blades; during rotational flow, moisture and impurities in air are thrown on the inner wall of the shell, and then gas is filtered by the filter screen, enters the valve cavity and is discharged through the outlet, so that the situation that the service life of the filter screen is affected due to the fact that impurities such as water vapor and oil in the air are directly adsorbed on the filter screen when the air enters the shell and is in direct contact with the filter screen is avoided; the service life of the filter screen is prolonged.

Description

Technical Field

[0001] The utility model relates to a valve accessory, in particular to an air filtering pressure reducing valve. Background Art

[0002] In the pneumatic system, the filter pressure reducing valve can filter the gas and then stabilize the pressure to keep the gas pressure constant, thus reducing the damage to hardware such as valves or actuators caused by sudden changes in the gas source pressure.

[0003] The overall structure of a traditional air filter pressure reducing valve is as follows: the drainage chamber, the pressure reducing chamber, and the spring chamber form the outer shell structure of the pressure reducing valve; the filter sleeve is fixed on the pressure reducing chamber through a tray, and is used to filter the compressed air of the input pressure; the lower end of the pressure regulating valve core is equipped with a return spring to seal the pressure regulating valve core and the lower end of the pressure reducing chamber; the diaphragm tray component is fixed by the spring chamber and the pressure reducing chamber;

[0004] In the existing air filter pressure reducing valve, the gas enters from the inlet of the valve body and directly contacts the filter screen for filtration. However, in the existing method, the gas directly contacts the filter screen for filtration, and the impurities such as moisture and oil in the air are directly adsorbed on the filter screen, resulting in a short service life of the filter screen, frequent blockage, and short maintenance intervals. Frequent maintenance operations are troublesome and cumbersome. Therefore, an air filter pressure reducing valve is proposed. Utility Model Content

[0005] The utility model aims to solve the above problems and provides an air filtering pressure reducing valve.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: an air filtering pressure reducing valve, comprising a valve body, an upper cover installed on the valve body, a diaphragm assembly installed between the valve body and the upper cover, an adjusting knob installed on the upper cover, a spring arranged on the diaphragm assembly, a spring baffle arranged on the spring, a valve stem slidably installed on the valve body and one end of which is in contact with the diaphragm assembly, and a valve core connected to the valve stem; it is characterized in that it also includes a shell installed on the valve body, a filter installed in the shell, and a guide plate installed between the valve body and the filter screen for guiding the gas entering the shell to swirl, and the guide plate is provided with a plurality of guide blades; the valve body is provided with a valve cavity, an inlet connected to the shell, and an outlet connected to the valve cavity.

[0007] Further preferably, a filter bracket connected to the valve body is also installed in the shell; the filter bracket is provided with a base connected to the valve body and used for movably mounting the valve core.

[0008] Further preferably, a plurality of through grooves are provided on the base, and a valve core return spring is installed between the base and the valve core.

[0009] Further preferably, the valve core is provided with a positioning hole, and the valve stem is provided with a positioning rod adapted to the positioning hole; and a sealing gasket is installed on the valve core and contacts with the valve body to perform a sealing and cutting function.

[0010] Further preferably, a sealing member is installed on one end of the valve stem connected to the diaphragm assembly, an overflow hole is provided at the contact connection between the diaphragm assembly and the valve stem; and a pressure relief hole for pressure relief is provided on the upper cover.

[0011] Further preferably, the valve body is also provided with a through hole.

[0012] Further preferably, a drain screw is also installed at the bottom of the shell.

[0013] The beneficial effects of the utility model are as follows: by installing a guide plate in the shell, when the gas enters the shell through the inlet, the guide plate guides the entering gas, so that the gas forms a swirl in the shell along the guide blades. During the swirl, the moisture and impurities in the air are thrown onto the inner wall of the shell, and then the gas enters the valve cavity after being filtered by the filter screen, and then is discharged through the outlet, so that the air is prevented from directly contacting the filter screen when entering the shell, causing the water vapor, oil and other impurities in the air to be directly adsorbed on the filter screen, thereby affecting the service life of the filter screen, thereby increasing the service life of the filter screen, increasing the maintenance interval, and reducing the number of maintenance times;

[0014] By setting an overflow hole on the diaphragm assembly, the valve stem and the diaphragm assembly are in contact connection, and a pressure relief hole is set on the upper cover. When the pressure at the outlet is greater than the set pressure, the gas pushes the diaphragm assembly to overcome the set pressure and move upward, so that the diaphragm assembly is disengaged from the top of the valve stem. At this time, the gas flows through the overflow hole to the upper diaphragm cavity between the diaphragm assembly and the upper cover, and then the gas entering the upper diaphragm cavity is discharged to the atmosphere through the pressure relief hole, thereby maintaining pressure stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a structural schematic diagram of the utility model;

[0016] Attached Figure 2 It is a partial enlarged structural schematic diagram of the diaphragm assembly in the utility model;

[0017] Attached Figure 3 It is a partial enlarged structural diagram of the valve core in the utility model;

[0018] Attached Figure 4 It is a schematic diagram of the top view of the base in the utility model;

[0019] Attached Figure 5 It is a schematic diagram of the top view of the structure of the guide plate in the utility model.

[0020] Legend: 1. Valve body; 11. Valve cavity; 12. Inlet; 13. Outlet; 14. Through hole; 2. Upper cover; 21. Pressure relief hole; 3. Diaphragm assembly; 31. Spring; 32. Spring baffle; 33. Overflow hole; 4. Adjusting knob; 5. Valve stem; 51. Positioning rod; 52. Seal; 6. Valve core; 61. Positioning hole; 62. Sealing gasket; 7. Housing; 71. Filter; 72. Guide plate; 73. Guide vane; 75. Filter bracket; 76. Base; 77. Through slot; 78. Valve core return spring; 79. Drain screw. DETAILED DESCRIPTION

[0021] Below we further explain the air filter pressure reducing valve described in the utility model in conjunction with the accompanying drawings.

[0022] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the utility model are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0023] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense; for example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1-5 As shown in, an air filtering pressure reducing valve comprises a valve body 1, an upper cover 2 mounted on the valve body 1, a diaphragm assembly 3 mounted between the valve body 1 and the upper cover 2, an adjusting knob 4 mounted on the upper cover 2, a spring 31 arranged on the diaphragm assembly 3, a spring baffle 32 arranged on the spring 31, a valve stem 5 slidably mounted on the valve body 1 and one end of which is in contact with the diaphragm assembly 3, and a valve core 6 connected to the valve stem 5; it is characterized in that it also comprises a shell 7 mounted on the valve body 1, a filter screen 71 mounted in the shell 7, and a guide plate 72 mounted between the valve body 1 and the filter screen 71 for guiding the gas entering the shell 7 to swirl, and the guide plate 72 is provided with a plurality of guide blades 73; the valve body 1 is provided with a valve cavity 11, an inlet 12 communicated with the shell 7, and an outlet 13 communicated with the valve cavity 11;

[0025] By installing a guide plate 72 in the outer shell 7, when the gas enters the outer shell 7 through the inlet 12, the guide plate 72 guides the incoming gas, so that the gas forms a vortex in the outer shell 7 along the guide blades 73. During the vortex, the moisture and impurities in the air are thrown onto the inner wall of the outer shell 7, and then the gas enters the valve chamber 11 after being filtered by the filter 71, and then is discharged through the outlet 13, so as to avoid direct contact between the air and the filter 71 when entering the outer shell 7, which would cause the water vapor, oil and other impurities in the air to be directly adsorbed on the filter 71 and affect the service life of the filter 71, thereby improving the service life of the filter 71, increasing the maintenance interval, and reducing the number of maintenance times.

[0026] In one embodiment, a filter bracket 75 connected to the valve body 1 is also installed in the shell 7; the filter bracket 75 is provided with a base 76 connected to the valve body 1 and used for movably installing the valve core 6; the base 76 is provided with a plurality of through grooves 77, and a valve core reset spring 78 is also installed between the base 76 and the valve core 6; the through grooves 77 are provided to connect the cavity in the filter membrane with the valve cavity 11 for gas delivery; the valve core reset spring 78 is provided to push the valve core 6 and the valve stem 5 to reset.

[0027] In one embodiment, the valve core 6 is provided with a positioning hole 61, and the valve stem 5 is provided with a positioning rod 51 adapted to the positioning hole 61; a sealing gasket 62 is installed on the valve core 6, which contacts the valve body 1 and plays a sealing and cutting role; through the setting of the positioning hole 61 and the positioning rod 51, the connection position of the valve stem 5 and the valve core 6 is limited, thereby avoiding the problem of the valve stem 5 and the valve core 6 being disconnected and offset during use; through the setting of the sealing gasket 62, when the valve is closed, it not only seals the valve core 6 and the valve body 1, but also has a buffering effect between the valve core 6 and the valve body 1, and plays a soft sealing role.

[0028] In one embodiment, a sealing member 52 is installed on one end of the valve stem 5 connected to the diaphragm assembly 3, and an overflow hole 33 is provided at the contact connection between the diaphragm assembly 3 and the valve stem 5; a pressure relief hole 21 for pressure relief is provided on the upper cover 2; through the setting of the sealing member 52, when the diaphragm assembly 3 and the valve stem 5 are in contact, it plays a sealing role, and at the same time plays a buffering role when the valve stem 5 and the diaphragm assembly 3 are in contact;

[0029] By setting an overflow hole 33 on the diaphragm assembly 3, the valve stem 5 and the diaphragm assembly 3 are in contact connection, and a pressure relief hole 21 is set on the upper cover 2. When the pressure of the outlet 13 is greater than the set pressure, the gas pushes the diaphragm assembly 3 to overcome the set pressure and move upward, so that the diaphragm assembly 3 and the top of the valve stem 5 are disengaged. At this time, the gas flows through the overflow hole 33 to the upper diaphragm cavity between the diaphragm assembly 3 and the upper cover 2, and then enters the gas in the upper diaphragm cavity and is discharged to the atmosphere through the pressure relief hole 21, thereby maintaining the stability of the pressure.

[0030] In one embodiment, the valve body 1 is further provided with a through hole 14; the through hole 14 is used to connect the valve cavity 11 with the lower mold cavity between the diaphragm assembly 3 and the valve body 1, and is used to introduce the post-valve medium pressure into the lower diaphragm cavity to maintain a balance with the pressure of the spring 31. At the same time, when the post-valve medium pressure is greater than the set spring 31 pressure, the diaphragm assembly 3 can be pushed upward to discharge the medium pressure to the atmosphere through the pressure relief hole 21.

[0031] When the utility model is in use, the adjusting knob 4 is rotated, and the adjusting knob 4 compresses the spring 31 after being rotated. After the spring 31 is compressed, it pushes the diaphragm assembly 3 downward, and the diaphragm assembly 3 pushes the valve stem 5 and the valve core 6 to move downward. The valve core 6 squeezes the valve core reset spring 78 during the downward movement, and at the same time opens the channel between the valve core 6 and the valve body 1, and the medium flow path is connected. At this time, the gas enters the valve body 1 through the inlet 12 and flows to the guide plate and then swirls along the guide blades 73 on the guide plate. During the swirl process, the gas contacts the inner wall of the shell 7, and some moisture, oil and impurities in the air are thrown on the inner wall of the shell 7. The gas enters the inside of the filter screen 71 after being filtered by the filter screen 71, and then flows into the valve cavity 11 through the through groove 77 on the base 76 and the channel between the valve core 6 and the valve body 1, and then is discharged through the outlet 13; at the same time, one path of gas in the valve cavity 11 enters the valve through the through hole 14 When the pressure at the outlet 13 rises to the pressure value set by the spring 31, the pressure at the bottom of the diaphragm assembly 3 is balanced with the pressure of the spring 31 and maintains the set pressure. When the pressure at the outlet 13 is greater than the set pressure, the pressure at the bottom of the diaphragm assembly 3 is greater than the pressure of the spring 31, pushing the diaphragm assembly 3 upward. At the same time, the valve core return spring 78 pushes the valve core 6 and the valve stem 5 upward until the valve core 6 fits with the valve body 1 to cut off the flow path. The diaphragm assembly 3 continues to push upward to open the diaphragm assembly 3 and the top of the valve stem 5. The gas at the bottom of the diaphragm assembly 3 flows to the upper cavity of the diaphragm assembly 3 through the overflow hole 33, and then is discharged to the atmosphere through the pressure relief hole 21 for pressure relief. After the pressure at the outlet 13 is stable with the set pressure, the diaphragm assembly 3 is pushed downward by the force of the spring 31, and the diaphragm assembly 3 pushes the valve stem 5 and the valve core 6 downward to open the flow path.

[0032] The protection scope of the present utility model is not limited to the above embodiments and their variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment all fall within the protection scope of the present utility model.

Claims

1. An air filter pressure reducing valve, comprising a valve body (1), an upper cover (2) mounted on the valve body (1), a diaphragm assembly (3) mounted between the valve body (1) and the upper cover (2), an adjusting knob (4) mounted on the upper cover (2), a spring (31) arranged on the diaphragm assembly (3), a spring baffle (32) arranged on the spring (31), a valve stem (5) slidably mounted on the valve body (1) and having one end in contact with the diaphragm assembly (3), and a valve core (6) connected to the valve stem (5); wherein the valve stem (5) is provided with a plurality of valve elements, wherein the plurality of valve elements are ... The valve body (1) further comprises a housing (7) mounted on the valve body (1), a filter screen (71) mounted in the housing (7), and a guide plate (72) mounted between the valve body (1) and the filter screen (71) for guiding the gas entering the housing (7) to swirl, wherein the guide plate (72) is provided with a plurality of guide blades (73); the valve body (1) is provided with a valve cavity (11), an inlet (12) communicated with the housing (7), and an outlet (13) communicated with the valve cavity (11).

2. An air filter pressure reducing valve according to claim 1, characterized in that: A filter support (75) connected to the valve body (1) is also installed in the housing (7); a base (76) connected to the valve body (1) and used for movably mounting the valve core (6) is provided on the filter support (75).

3. An air filter pressure reducing valve according to claim 2, characterized in that: The base (76) is provided with a plurality of through grooves (77), and a valve core return spring (78) is installed between the base (76) and the valve core (6).

4. The air filter pressure reducing valve according to claim 1, characterized in that: The valve core (6) is provided with a positioning hole (61), and the valve stem (5) is provided with a positioning rod (51) adapted to the positioning hole (61); and a sealing gasket (62) is installed on the valve core (6) and contacts the valve body (1) to perform a sealing and cutting function.

5. The air filter pressure reducing valve according to claim 1, characterized in that: A sealing member (52) is installed on one end of the valve stem (5) connected to the diaphragm assembly (3), and an overflow hole (33) is provided at the contact connection between the diaphragm assembly (3) and the valve stem (5); and a pressure relief hole (21) for pressure relief is provided on the upper cover (2).

6. The air filter pressure reducing valve according to claim 1, characterized in that: The valve body (1) is also provided with a through hole (14).

7. The air filter pressure reducing valve according to claim 1, characterized in that: A drainage screw (79) is also installed at the bottom of the housing (7).

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