Pressure regulating device for positive pressure constant humidity equipment

Abstract

The utility model discloses a kind of positive pressure type constant humidity equipment pressure regulating device, belong to pressure regulating technical field, including constant humidity machine, the one side of constant humidity machine is provided with the pressure relief component for adjusting the pressure inside constant humidity machine, form two-stage pressure relief structure by the upper valve body and the lower valve body in pressure relief component, spring-driven piston assembly is first pressure relief mode (small flow), spherical valve core is second pressure relief mode (large flow), in lower valve body, spring is sleeved on the outside of guide shaft, normally push piston seal pressure relief through-hole, when pressure slightly overpressure, air pressure overcomes spring elasticity, piston moves up and realizes small flow slow release, in upper valve body, spherical valve core and spherical valve seat normal seal, when pressure greatly overpressure, air pressure pushes valve core to separate from valve seat, realize large flow rapid release by first pressure relief port and second pressure relief port, avoid the sharp drop in pressure, below minimum limit after system again full power pressure compensation, and the energy waste caused.

Description

Technical Field

[0001] This utility model relates to the field of pressure regulation production technology, and more specifically, it relates to a pressure regulating device for positive pressure constant humidity equipment. Background Technology

[0002] Positive pressure constant humidity equipment is a specialized device that integrates positive pressure environmental control and precise humidity regulation. Its core is to maintain the internal air pressure higher than the external environment, combined with a humidity control system, to achieve constant humidity control in a closed space, while blocking the intrusion of external pollutants and uncontrolled humid air. It is suitable for scenarios with high requirements for humidity accuracy and environmental cleanliness.

[0003] In large warehouses, production workshops, or integrated laboratories, where a positive pressure and constant humidity environment needs to be maintained, the gas volume changes caused by personnel activities or the opening and closing of doors and windows are significant, which can easily cause rapid fluctuations in internal pressure. In order to protect stored items, precision equipment, or ensure a specific process atmosphere, the space pressure must be maintained within a narrow set range. In existing technologies, positive pressure regulation of such large spaces mainly relies on large-diameter single-point pressure relief valves (such as gravity or spring-loaded safety valves). Their working mode is a binary state of "fully open when overpressure, fully closed when pressure drops". When the pressure slightly exceeds the set value, the valve opens completely to release a large flow. Although this can prevent dangerous overpressure, it will cause the pressure to drop sharply, possibly momentarily falling below the minimum limit. Subsequently, the system needs to make full pressure replenishment. This violent "pressure oscillation" not only wastes energy, but also causes continuous periodic airflow impact on the internal environment, which is not conducive to items or processes that are sensitive to airflow. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: A pressure regulating device for a positive pressure constant humidity equipment includes a constant humidity machine, and a pressure relief component for regulating the internal pressure of the constant humidity machine is provided on one side of the constant humidity machine; The pressure relief assembly includes an upper valve body and a lower valve body. The upper valve body has a first valve chamber and a first pressure relief port on the top inner wall. A spherical valve core is provided at the bottom of the first pressure relief port. A spherical valve seat is provided at the bottom of the spherical valve core and is sealed by engaging with the lower part of the spherical valve core. A limiting seat is constructed at the bottom of the spherical valve seat. A second pressure relief port is provided between the spherical valve seat and the limiting seat on the inner wall of the upper valve body. The limiting seat is fixedly connected to the inner wall of the first valve chamber. The limiting seat has a vertically penetrating venting channel. A limiting groove is provided on the side of the limiting seat away from the spherical valve seat. A limiting hole is provided in the middle of the limiting groove. The lower valve body is provided with an annular valve seat at the bottom, and a pressure relief through hole is provided in the middle of the annular valve seat. A piston assembly is provided at the top of the pressure relief through hole, and the piston assembly is adapted to and abuts against the pressure relief through hole. The lower valve body is connected to an exhaust pipe at its bottom, and the lower valve body and the exhaust pipe are detachably connected and have a sealing structure.

[0005] Furthermore, the piston assembly includes a piston, a guide shaft, and a spring; the guide shaft is movably inserted into the limiting groove, the piston is fixedly disposed at the end of the guide shaft away from the limiting groove, the spring is sleeved on the outside of the guide shaft, and both ends of the spring abut against the piston and the groove wall of the limiting groove, respectively.

[0006] Furthermore, the bottom of the piston is provided with a downwardly protruding annular sealing part, and the periphery of the pressure relief through hole is provided with an annular sealing surface, the annular sealing surface being adapted to and fitting the shape of the annular sealing part.

[0007] Furthermore, the outer periphery of the limiting seat is provided with a radially protruding first flange, and the top outer periphery of the lower valve body is provided with a second flange, which fits into the first flange and is fixed by bolts.

[0008] Furthermore, the sealing structure includes an annular limiting block, an annular limiting groove, and a sealing ring; the annular limiting block protrudes from the bottom of the lower valve body, the annular limiting groove is opened at the top of the exhaust pipe and fits into the annular limiting block; the sealing ring is sandwiched between the annular limiting block and the annular limiting groove.

[0009] Furthermore, the exhaust pipe has an arc-shaped structure, and one end of the exhaust pipe is connected to the pressure chamber of the constant humidity machine through a pipe.

[0010] Furthermore, protective nets are installed on the outer sides of both the first and second pressure relief ports.

[0011] In summary, this utility model has the following beneficial effects: This invention forms a two-stage pressure relief structure through the upper and lower valve bodies within the pressure relief assembly. The spring-driven piston assembly provides the first pressure relief method (small flow rate), while the spherical valve core provides the second pressure relief method (large flow rate). In the lower valve body, the spring is sleeved on the outside of the guide shaft. Under normal conditions, it pushes the piston to seal the pressure relief orifice. When the pressure slightly exceeds the limit, the air pressure overcomes the spring force, and the piston moves upward to achieve a slow release of small flow rate. In the upper valve body, the spherical valve core and the spherical valve seat are normally sealed. When the pressure significantly exceeds the limit, the air pressure pushes the valve core away from the valve seat, achieving rapid release of large flow rate through the first and second pressure relief ports. This avoids the energy waste caused by a sharp drop in pressure below the minimum limit, which would otherwise require the system to exert maximum pressure to compensate. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic cross-sectional view of the upper valve body in the pressure relief assembly of this utility model; Figure 3 This is a schematic diagram of the lower valve body in the pressure relief assembly of this utility model; Figure 4 This is a schematic diagram of the piston assembly in the pressure relief assembly of this utility model; Figure 5 This is a schematic diagram of the annular valve assembly and piston in the pressure relief component of this utility model.

[0014] In the diagram: 1. Humidifier; 2. Pressure relief assembly; 3. Upper valve body; 301. First valve chamber; 302. First pressure relief port; 303. Spherical valve core; 304. Spherical valve seat; 305. Limiting seat; 306. Second pressure relief port; 307. Limiting groove; 308. Limiting hole; 309. First flange; 310. Protective net; 4. Lower valve body; 401. Annular valve seat; 402. Pressure relief through hole; 403. Annular sealing surface; 404. Second flange; 5. Exhaust pipe; 6. Piston assembly; 601. Piston; 602. Guide shaft; 603. Spring; 604. Annular sealing part. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Example

[0016] The following is in conjunction with the appendix Figure 1-5 The present invention will be described in further detail below.

[0017] Please see Figure 1-5 This utility model provides a technical solution: a pressure regulating device for a positive pressure constant humidity equipment, such as... Figure 1-2 As shown, it includes a constant humidity unit 1, and a pressure relief component 2 for adjusting the internal pressure of the constant humidity unit 1 is provided on one side of the constant humidity unit 1; The pressure relief assembly 2 includes an upper valve body 3 and a lower valve body 4, which are connected by a flange to form a whole, forming a two-stage pressure relief channel to realize the graded adjustment and release of the internal pressure of the constant humidifier 1. The upper valve body 3 has a first valve chamber 301, and the upper valve body 3 has a first pressure relief port 302 on the inner wall of the top. The bottom of the first pressure relief port 302 is provided with a spherical valve core 303, and the bottom of the spherical valve core 303 is provided with a spherical valve seat 304 that is joined with the lower part of the spherical valve core 303 to form a seal. When the internal pressure of the constant humidifier 1 does not exceed the first set value, the spherical valve core 303 is tightly fitted with the spherical valve seat 304 under its own weight and the upper air pressure to form a first-stage seal, preventing gas from escaping from the first pressure relief port 302. The bottom of the spherical valve seat 304 is constructed with a limiting seat 305, and a second pressure relief port 306 is provided between the spherical valve seat 304 and the limiting seat 305 on the inner wall of the upper valve body 3. The limiting seat 305 is fixedly connected to the inner wall of the first valve cavity 301, and the limiting seat 305 is provided with a vertically penetrating venting channel for gas flow. A limiting groove 307 is provided on the side of the limiting seat 305 away from the spherical valve seat 304, and a limiting hole 308 is provided in the middle of the limiting groove 307. Protective nets 310 are provided on the outer sides of the first pressure relief port 302 and the second pressure relief port 306.

[0018] like Figure 3 As shown, the lower valve body 4 is provided with an annular valve seat 401 at the bottom, and a pressure relief through hole 402 is provided in the middle of the annular valve seat 401. A piston assembly 6 is provided at the top of the pressure relief through hole 402. The piston assembly 6 is adapted to and abuts against the pressure relief through hole 402. The piston assembly 6 can move vertically under pressure to realize the opening and closing of the pressure relief through hole 402. The bottom of the lower valve body 4 is connected to an exhaust pipe 5. The exhaust pipe 5 has an arc-shaped structure, and one end of the exhaust pipe 5 is connected to the pressure chamber of the constant humidity machine 1 through a pipe. The lower valve body 4 and the exhaust pipe 5 are fixed by external fasteners (such as clamps or bolts) to ensure the airtightness of the connection. The connection is detachable, and a sealing structure is provided between the lower valve body 4 and the exhaust pipe 5. The sealing structure includes an annular limiting block 405, an annular limiting groove 501, and a sealing ring 502; the annular limiting block 405 protrudes from the bottom of the lower valve body 4, the annular limiting groove 501 is opened at the top of the exhaust pipe 5 and fits into the annular limiting block 405; the sealing ring 502 is sandwiched between the annular limiting block 405 and the annular limiting groove 501. The outer periphery of the limiting seat 305 is provided with a radially protruding first flange 309, and the top outer periphery of the lower valve body 4 is provided with a second flange 404. The second flange 404 fits against the first flange 309 and is fixed by bolts.

[0019] like Figure 4-5As shown, the piston assembly 6 includes a piston 601, a guide shaft 602, and a spring 603. The guide shaft 602 is movably inserted into the limiting groove 307. The piston 601 is fixedly disposed at one end of the guide shaft 602 away from the limiting groove 307. The spring 603 is sleeved on the outside of the guide shaft 602, and both ends of the spring 603 abut against the piston 601 and the groove wall of the limiting groove 307, respectively. Under normal pressure, the elastic force of the spring 603 presses the piston 601 downward, so that the annular sealing part 604 at its bottom fits tightly against the annular sealing surface 403 around the pressure relief through hole 402 of the lower valve body 4, forming a seal. The bottom of the piston 601 is provided with a downward protruding annular sealing part 604, and the periphery of the pressure relief through hole 402 is provided with an annular sealing surface 403. The annular sealing surface 403 is adapted to and fits the annular sealing part 604.

[0020] Working principle: When the internal pressure of the constant humidity machine 1 is within the set range, the elastic force of the spring 603 pushes the piston 601 downward to press it tightly. The annular sealing part 604 at the bottom of the piston 601 is completely in contact with the annular sealing surface 403 of the lower valve body 4, sealing the pressure relief hole 402 and forming the first stage of sealing. At the same time, under the action of its own weight and the upper air pressure, the spherical valve core 303 is tightly in contact with the spherical valve seat 304, sealing the first pressure relief port 302 and forming the second stage of sealing. The entire pressure relief assembly is in a sealed state, blocking the gas from leaking out and maintaining the positive pressure environment inside the constant humidity machine 1. When the pressure inside the constant humidity chamber 1 rises slightly above the first set value, the pressure difference overcomes the elastic force of the spring 603, pushing the piston 601 to move upward, causing the annular sealing part 604 to disengage from the annular sealing surface 403. Gas slowly leaks out through the ventilation channel that runs vertically through the limit seat 305 and through the second pressure relief port 306, achieving small-flow pressure relief. If the pressure continues to rise to the second set value, the pressure difference overcomes the weight of the spherical valve core 303 and the external air pressure, pushing the spherical valve core 303 upward to disengage from the spherical valve seat 304. A large amount of gas is discharged simultaneously through the first pressure relief port 302 and the second pressure relief port 306, achieving large-flow rapid pressure relief.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A pressure regulating device for a positive pressure constant humidity equipment, characterized in that, include: A constant humidity machine (1) is provided on one side of the constant humidity machine (1) for adjusting the internal pressure of the constant humidity machine (1). The pressure relief assembly (2) includes an upper valve body (3) and a lower valve body (4). The upper valve body (3) has a first valve chamber (301) and a first pressure relief port (302) on the inner wall of the top of the upper valve body (3). A spherical valve core (303) is provided at the bottom of the first pressure relief port (302). A spherical valve seat (304) is provided at the bottom of the spherical valve core (303) and is connected to the lower part of the spherical valve core (303) to form a seal. The bottom of the spherical valve seat (304) is constructed with a limit seat. 305), and a second pressure relief port (306) is provided between the ball valve seat (304) and the limiting seat (305) at the inner wall of the upper valve body (3). The limiting seat (305) is fixedly connected to the inner wall of the first valve cavity (301). The limiting seat (305) is provided with a ventilation channel that runs vertically through the upper and lower parts. A limiting groove (307) is provided on the side of the limiting seat (305) away from the ball valve seat (304). A limiting hole (308) is provided in the middle of the limiting groove (307). The lower valve body (4) is provided with an annular valve seat (401) at the bottom, and a pressure relief through hole (402) is provided in the middle of the annular valve seat (401). A piston assembly (6) is provided at the top of the pressure relief through hole (402). The piston assembly (6) is adapted to the pressure relief through hole (402) and abuts against the pressure relief through hole (402). The lower valve body (4) is connected to an exhaust pipe (5) at its bottom, and the lower valve body (4) and the exhaust pipe (5) are detachably connected and have a sealing structure.

2. The pressure regulating device for a positive pressure constant humidity equipment according to claim 1, characterized in that, The piston assembly (6) includes a piston (601), a guide shaft (602), and a spring (603); the guide shaft (602) is movably inserted into the limiting groove (307), the piston (601) is fixedly disposed at one end of the guide shaft (602) away from the limiting groove (307), and the spring (603) is sleeved on the outside of the guide shaft (602), with both ends of the spring (603) abutting against the piston (601) and the groove wall of the limiting groove (307), respectively.

3. The pressure regulating device for a positive pressure constant humidity equipment according to claim 2, characterized in that, The piston (601) has a downward protruding annular sealing part (604) at its bottom, and the pressure relief through hole (402) has an annular sealing surface (403) around its periphery. The annular sealing surface (403) is adapted to and fits the annular sealing part (604) in shape.

4. The pressure regulating device for a positive pressure constant humidity equipment according to claim 1, characterized in that, The outer periphery of the limiting seat (305) is provided with a radially protruding first flange (309), and the outer periphery of the top of the lower valve body (4) is provided with a second flange (404). The second flange (404) fits against the first flange (309) and is fixed by bolts.

5. The pressure regulating device for a positive pressure constant humidity equipment according to claim 1, characterized in that, The sealing structure includes an annular limiting block (405), an annular limiting groove (501), and a sealing ring (502); the annular limiting block (405) protrudes from the bottom of the lower valve body (4), the annular limiting groove (501) is opened at the top of the exhaust pipe (5) and fits into the annular limiting block (405); the sealing ring (502) is sandwiched between the annular limiting block (405) and the annular limiting groove (501).

6. The pressure regulating device for a positive pressure constant humidity equipment according to claim 5, characterized in that, The exhaust pipe (5) has an arc-shaped structure, and one end of the exhaust pipe (5) is connected to the pressure chamber of the constant humidity machine (1) through a pipe.

7. The pressure regulating device for a positive pressure constant humidity equipment according to claim 5, characterized in that, A protective net (310) is provided on the outside of both the first pressure relief port (302) and the second pressure relief port (306).

Images