Pressure reducing valve used in negative pressure vacuum environment

Abstract

The utility model relates to the field of pressure reducing valves, in particular to a pressure reducing valve used in a negative pressure vacuum environment. The technical problems that when a pressure reducing valve in the prior art is used in a negative-pressure vacuum environment for a long time, the outer wall of a valve body is prone to being eroded by humid gas due to lack of a protection structure outside the valve body, and the protection structure is inconvenient to rapidly install are solved. According to the technical scheme, the pressure reducing valve used in the negative-pressure vacuum environment comprises a bottom plate assembly; the device further comprises a first locking assembly, a first protection assembly, a second protection assembly, a reinforcing assembly and a second locking assembly. According to the pressure reducing valve, the second protection assembly is placed at the upper end of the bottom plate assembly, the second protection assembly and the first protection assembly protect the exterior of the pressure reducing valve body, then the first locking assembly is installed on the bottom plate assembly, the second locking assembly is installed on the first protection assembly and the second protection assembly, and therefore the pressure reducing valve body can be locked. Therefore, the outside of the pressure reducing valve body can be protected.

Description

Technical Field

[0001] The utility model belongs to the field of pressure reducing valves, and in particular relates to a pressure reducing valve used in a negative pressure vacuum environment. Background Art

[0002] In a negative pressure vacuum environment, a pressure reducing valve is a key device used to control and adjust the environmental pressure. Pressure reducing valves are used in many fields, including vacuum pumps, gas absorption devices, air tightness testing equipment, etc. Existing pressure reducing valves usually adopt a fixed pressure reducing ratio design to adjust the pressure by changing the ratio between the outlet pressure and the inlet pressure. However, when the pressure reducing valve in the prior art is used in a negative pressure vacuum environment for a long time, the outside of the valve body lacks a protective structure, which makes the outer wall of the valve body susceptible to erosion by humid gas, and it is not convenient to quickly install the protective structure, which needs further improvement. Utility Model Content

[0003] In order to solve the problem that when the pressure reducing valve in the prior art is used for a long time in a negative pressure vacuum environment, there is a lack of a protective structure on the outside of the valve body, which makes the outer wall of the valve body easily corroded by humid gas and is inconvenient to quickly install the protective structure.

[0004] The technical solution of the utility model is: a pressure reducing valve for use in a negative pressure vacuum environment, comprising a base plate assembly; further comprising a first locking assembly, a first protective assembly, a second protective assembly, a reinforcement assembly and a second locking assembly; a first locking assembly for locking is arranged at the upper end of the base plate assembly; a first protective assembly for protection is arranged at the upper end of the base plate assembly; a second protective assembly for protection is arranged at the upper end of the base plate assembly; a reinforcement assembly for reinforcement is arranged on the first protective assembly and the second protective assembly; a second locking assembly for locking is arranged on the first protective assembly and the second protective assembly; a pressure reducing valve body is arranged inside the first protective assembly and the second protective assembly; and fixing pipes are installed on the air inlet and outlet ports of the pressure reducing valve body.

[0005] Preferably, when in use, the pressure reducing valve body is placed on the upper end of the base plate assembly, and then the second protective assembly is placed on the upper end of the base plate assembly, so that the second protective assembly and the first protective assembly protect the outside of the pressure reducing valve body. Thereafter, the first locking assembly is installed on the base plate assembly, the reinforcement assembly is installed on the first protective assembly and the second protective assembly, and the second locking assembly is installed on the first protective assembly and the second protective assembly. This allows the base plate assembly, the first protective assembly and the second protective assembly to be quickly and stably installed on the outside of the pressure reducing valve body, thereby solving the problem in the prior art that when the pressure reducing valve is used for a long time in a negative pressure vacuum environment, the outside of the valve body lacks a protective structure, which makes the outer wall of the valve body easily corroded by humid gas and is inconvenient to quickly install the protective structure.

[0006] Preferably, the bottom plate assembly includes a support plate, a rubber plate, a first support block, a first arc-shaped block and a first through hole; the rubber plate is fixedly connected to the center of the upper end of the support plate; the first support block is fixedly connected to the front and rear edges of the upper end of the support plate; the first arc-shaped block is fixedly connected to the upper end of the first support block; two first through holes are penetrated at the left and right ends of the first support block; the upper end of the rubber plate is fitted with the lower end of the pressure reducing valve body, and the lower end of the pressure reducing valve body is placed in the center of the upper end of the rubber plate, so that the pressure reducing valve body can be stably placed.

[0007] Preferably, the first locking assembly includes a U-shaped block, a second supporting block, a limiting column, a second arc-shaped block and a first bolt; a U-shaped block is movably provided on the upper end of the supporting plate; the right end of the U-shaped block is fixedly connected to two second supporting blocks symmetrical about the center of the U-shaped block; the upper end of the second supporting block is fixedly connected to the second arc-shaped block; the right end of the second supporting block is fixedly connected to two limiting columns; the outer wall of the limiting column fits with the inner wall of the first through hole; the first bolt is threadedly installed in the middle of the upper and lower ends of the U-shaped block; the lower end of the first bolt penetrates the U-shaped block and is threadedly installed in the wall layer of the supporting plate; the right end of the second arc-shaped block and the left end of the first arc-shaped block fit together to form a circular ring shaped structure; the circular structure formed by the inner walls of the second arc block and the first arc block fits with the outer wall of the fixing tube, and the U-shaped block is placed on the upper end of the support plate, so that the inner wall of the U-shaped block limits the second protective assembly, and at the same time, the limiting column extends through the first through hole to the right of the first support block, and then the lower end of the first bolt passes through the U-shaped block and is threadedly installed in the wall layer of the support plate, so that the U-shaped block can be quickly and stably fixed to the upper end of the support plate. At this time, the second arc block and the first arc block will be limited to the outer wall of the fixing tube, so that the second arc block and the first arc block are suspended by the two fixing tubes to achieve stable installation of the support plate.

[0008] Preferably, the first protective assembly includes a first protective plate, a mounting groove, a first curved plate, a first screw hole, a first groove body, a first U-shaped seat and a second through hole; the first protective plate is fixedly connected to the right edge of the upper end of the support plate; the first curved plates symmetrically about the center of the first protective plate are penetrated through the upper parts of the left and right ends of the first protective plate; the first curved plate is fixedly connected to the upper end of the first protective plate; the first screw holes are penetrated through the upper and lower ends of the first curved plate; the first groove body is penetrated through the upper and lower ends of the first curved plate; the first groove body is through-arranged at the left end of the first curved plate; the upper end of the first curved plate is fixedly connected to the first U-shaped seat symmetrically about the center of the first curved plate; the front and rear ends of the first U-shaped seat are penetrated with second through holes; the inner wall of the first groove body is in contact with the upper outer wall of the pressure reducing valve body, and the inner wall of the first groove body is in contact with the upper outer wall of the pressure reducing valve body, which is convenient for protecting the pressure reducing valve body.

[0009] Preferably, the second protective assembly includes a second protective plate, an arc-shaped groove, a second arc-shaped plate and a second U-shaped seat; a second protective plate is movably arranged at the left edge of the upper end of the support plate; an arc-shaped groove is provided through the front and rear ends of the second protective plate; the arc-shaped groove is through-set at the right end of the second protective plate; the second protective plate and the first protective plate have the same structure; the inner wall of the arc-shaped groove fits with the outer wall of the fixed tube; the upper end of the second protective plate is fixedly connected to the second arc-shaped plate; the second arc-shaped plate and the first arc-shaped plate have the same structure; the upper end of the second arc-shaped plate is fixedly connected to a second U-shaped seat symmetrical about the center of the second arc-shaped plate; the right end of the second U-shaped seat and the left end of the first arc-shaped plate fit together to form a circular structure; the outer wall of the second protective plate and the inner wall of the U-shaped block fit together, and the second protective plate is placed on the upper end of the support plate so that the outer wall of the second protective plate and the inner wall of the U-shaped block fit together, thereby achieving stable placement of the second protective plate.

[0010] Preferably, the reinforcement component includes an insert block, a second screw hole and a second bolt; the inner wall of the mounting groove is movably provided with an insert block; the insert block is in a "U"-shaped structure; the left end of the insert block passes through the second protective plate and extends to the left side of the second protective plate; second screw holes are provided at the upper and lower ends of the insert block; the inner wall of the second screw hole is threadedly installed with a second bolt; the outer wall of the second bolt is threadedly connected to the inner wall of the first screw hole, the insert block is first passed through the mounting grooves on the first protective plate and the second protective plate, and then the second bolt is passed through the first screw hole from top to bottom and threadedly installed on the inner wall of the second screw hole, so that the insert block can be stably placed, thereby improving the stability of the first protective component and the second protective component during assembly.

[0011] Preferably, the second locking assembly includes a mounting block, a mounting rod and an internally threaded barrel; a mounting block is movably provided on the inner wall of the first U-shaped seat and the inner wall of the second U-shaped seat; a mounting rod is movably provided on the front and rear ends of the mounting block; the outer wall of the mounting rod fits the inner wall of the second through hole; the outer wall of the mounting rod and the outer walls at both ends of the mounting rod are both threadedly provided with an internally threaded barrel, one end of the mounting rod is passed through the mounting block and the second through hole, and the other end of the mounting rod is passed through the holes through the front and rear ends of the mounting block and the second U-shaped seat, and then the internally threaded barrel is threadedly installed on the outer wall of the mounting rod, so that the mounting rod and the mounting block can be fixed on the second U-shaped seat and the first U-shaped seat, and the device can be conveniently moved by holding the two mounting rods.

[0012] Beneficial effects of the utility model:

[0013] 1. By placing the U-shaped block on the upper end of the support plate, the inner wall of the U-shaped block limits the second protective assembly, and at the same time, the limiting column passes through the first through hole and extends to the right of the first support block, and then the lower end of the first bolt passes through the U-shaped block and is threadedly installed in the wall layer of the support plate, the U-shaped block can be quickly and stably fixed to the upper end of the support plate. At this time, the second arc block and the first arc block will be limited to the outer wall of the fixing tube, so that the second arc block and the first arc block are hung by two fixing tubes, so as to achieve stable installation of the support plate and facilitate quick disassembly, thereby solving the problem that when the pressure reducing valve in the prior art is used for a long time in a negative pressure vacuum environment, the outer wall of the valve body is easily corroded by humid gas, and it is inconvenient to quickly install the protective structure;

[0014] 2. By placing the second protective plate on the upper end of the support plate so that the outer wall of the second protective plate fits the inner wall of the U-shaped block, the second protective plate can be stably placed. First, the plug block is passed through the installation grooves on the first protective plate and the second protective plate, and then the second bolt is passed through the first screw hole from top to bottom and threadedly installed on the inner wall of the second screw hole, so that the plug block can be stably placed, thereby improving the stability of the first protective assembly and the second protective assembly during assembly;

[0015] 3. By passing one end of the mounting rod through the mounting block and the second through hole, and passing the other end of the mounting rod through the holes opened at the front and rear ends of the mounting block and the second U-shaped seat, and then threading the internal threaded tube on the outer wall of the mounting rod, the mounting rod and the mounting block can be fixed on the second U-shaped seat and the first U-shaped seat. The device can be conveniently moved by holding the two mounting rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 What is shown is a three-dimensional structural schematic diagram of a pressure reducing valve used in a negative pressure vacuum environment of the utility model;

[0017] Figure 2 What is shown is a three-dimensional structural schematic diagram of a bottom plate assembly of a pressure reducing valve used in a negative pressure vacuum environment of the utility model;

[0018] Figure 3 Shown is a three-dimensional structural schematic diagram of a first locking assembly of a pressure reducing valve used in a negative pressure vacuum environment of the utility model;

[0019] Figure 4 Shown is a three-dimensional structural schematic diagram of a first protective component of a pressure reducing valve used in a negative pressure vacuum environment of the utility model;

[0020] Figure 5 The present invention is a schematic diagram of the three-dimensional structure of a second protection component and a second locking component of a pressure reducing valve used in a negative pressure vacuum environment;

[0021] Figure 6 Shown is a three-dimensional structural schematic diagram of a pressure reducing valve body and a fixing pipe of a pressure reducing valve used in a negative pressure vacuum environment of the utility model;

[0022] Figure 7 What is shown is a three-dimensional structural schematic diagram of a reinforcement component of a pressure reducing valve used in a negative pressure vacuum environment of the utility model.

[0023] The markings in the accompanying drawings are: 1-bottom plate assembly, 101-support plate, 102-rubber plate, 103-first support block, 104-first arc block, 105-first through hole, 2-first locking assembly, 201-U-shaped block, 202-second support block, 203-limiting column, 204-second arc block, 205-first bolt, 3-first protective assembly, 301-first protective plate, 302-installation groove, 303-first arc plate, 304-first Screw hole, 305-first groove body, 306-first U-shaped seat, 307-second through hole, 4-second protective assembly, 401-second protective plate, 402-arc groove, 403-second arc plate, 404-second U-shaped seat, 5-reinforcement assembly, 501-insert block, 502-second screw hole, 503-second bolt, 6-second locking assembly, 601-mounting block, 602-mounting rod, 603-inner threaded cylinder, 7-pressure reducing valve body, 8-fixing pipe. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1 and 6 The utility model provides an embodiment: a pressure reducing valve for use in a negative pressure vacuum environment, comprising a base plate assembly 1; further comprising a first locking assembly 2, a first protective assembly 3, a second protective assembly 4, a reinforcement assembly 5 and a second locking assembly 6; a first locking assembly 2 for locking is provided at the upper end of the base plate assembly 1; a first protective assembly 3 for protection is provided at the upper end of the base plate assembly 1; a second protective assembly 4 for protection is provided at the upper end of the base plate assembly 1; a reinforcement assembly 5 for reinforcement is provided on the first protective assembly 3 and the second protective assembly 4; a second locking assembly 6 for locking is provided on the first protective assembly 3 and the second protective assembly 4; a pressure reducing valve body 7 is provided inside the first protective assembly 3 and the second protective assembly 4; fixing pipes 8 are installed on the inlet and outlet ports of the pressure reducing valve body 7.

[0026] See also Figure 2In this embodiment, the bottom plate assembly 1 includes a support plate 101, a rubber plate 102, a first support block 103, a first arc block 104 and a first through hole 105; the rubber plate 102 is fixedly connected to the center of the upper end of the support plate 101; the first support block 103 is fixedly connected to the front and rear edges of the upper end of the support plate 101; the first arc block 104 is fixedly connected to the upper end of the first support block 103; two first through holes 105 are formed through the left and right ends of the first support block 103; the upper end of the rubber plate 102 is in contact with the lower end of the pressure reducing valve body 7.

[0027] See also Figure 3 In this embodiment, the first locking assembly 2 includes a U-shaped block 201, a second support block 202, a limiting column 203, a second arc block 204 and a first bolt 205; the upper end of the support plate 101 is movably provided with a U-shaped block 201; the right end of the U-shaped block 201 is fixedly connected to two second support blocks 202 symmetrically about the center of the U-shaped block 201; the upper end of the second support block 202 is fixedly connected to a second arc block 204; the right end of the second support block 202 is fixedly connected to two limiting columns 2 03; the outer wall of the limiting column 203 fits with the inner wall of the first through hole 105; the first bolt 205 is threadedly installed in the middle of the upper and lower ends of the U-shaped block 201; the lower end of the first bolt 205 passes through the U-shaped block 201 and is threadedly installed in the wall layer of the support plate 101; the right end of the second arc block 204 and the left end of the first arc block 104 fit together to form a circular ring structure; the circular structure formed by the inner walls of the second arc block 204 and the first arc block 104 fits with the outer wall of the fixed tube 8.

[0028] See also Figure 4 In this embodiment, the first protective assembly 3 includes a first protective plate 301, a mounting groove 302, a first curved plate 303, a first screw hole 304, a first groove body 305, a first U-shaped seat 306 and a second through hole 307; the first protective plate 301 is fixedly connected to the right edge of the upper end of the support plate 101; the first curved plates 303 symmetrically about the center of the first protective plate 301 are penetrated through the upper parts of the left and right ends of the first protective plate 301; the upper end of the first protective plate 301 is fixedly connected to the first curved plate 30 3; the first arc plate 303 has first screw holes 304 formed through the upper and lower ends; the first arc plate 303 has first slots 305 formed through the upper and lower ends; the first slot 305 is through-set at the left end of the first arc plate 303; the upper end of the first arc plate 303 is fixedly connected with a first U-shaped seat 306 symmetrical about the center of the first arc plate 303; the front and rear ends of the first U-shaped seat 306 have second through holes 307 formed through the inner wall of the first slot 305 and the outer wall of the upper end of the pressure reducing valve body 7 are in contact with each other.

[0029] See also Figure 5In this embodiment, the second protection component 4 includes a second protection plate 401, an arc groove 402, a second arc plate 403 and a second U-shaped seat 404; the second protection plate 401 is movably provided at the left edge of the upper end of the support plate 101; the front and rear ends of the second protection plate 401 are penetrated with an arc groove 402; the arc groove 402 is penetrated and provided at the right end of the second protection plate 401; the second protection plate 401 and the first protection plate 301 have the same structure; the arc groove 402 The inner wall of the second protective plate 401 fits with the outer wall of the fixed tube 8; the second curved plate 403 is fixedly connected to the upper end of the second protective plate 401; the second curved plate 403 and the first curved plate 303 have the same structure; the upper end of the second curved plate 403 is fixedly connected to a second U-shaped seat 404 symmetrical about the center of the second curved plate 403; the right end of the second U-shaped seat 404 and the left end of the first curved plate 303 fit together to form a circular ring structure; the outer wall of the second protective plate 401 fits with the inner wall of the U-shaped block 201.

[0030] See also Figure 7 In this embodiment, the reinforcement component 5 includes an insert block 501, a second screw hole 502 and a second bolt 503; the inner wall of the mounting groove 302 is movably provided with the insert block 501; the insert block 501 is in a "U"-shaped structure; the left end of the insert block 501 passes through the second protective plate 401 and extends to the left side of the second protective plate 401; the upper and lower ends of the insert block 501 are penetrated by second screw holes 502; the inner wall of the second screw hole 502 is threadedly installed with a second bolt 503; the outer wall of the second bolt 503 is threadedly connected to the inner wall of the first screw hole 304.

[0031] See also Figure 5 In this embodiment, the second locking assembly 6 includes a mounting block 601, a mounting rod 602 and an internally threaded tube 603; the inner wall of the first U-shaped seat 306 and the inner wall of the second U-shaped seat 404 are movably provided with the mounting block 601; the front and rear ends of the mounting block 601 are movably provided with mounting rods 602; the outer wall of the mounting rod 602 is fitted with the inner wall of the second through hole 307; the outer wall of the mounting rod 602 and the outer walls at both ends of the mounting rod 602 are both threadedly installed with internally threaded tubes 603.

[0032] When working, place the lower end of the pressure reducing valve body 7 at the center of the upper end of the rubber plate 102, place the first protective plate 301 and the second protective plate 401 at the upper end of the support plate 101, and place the U-shaped block 201 at the upper end of the support plate 101, so that the outer wall of the second protective plate 401 and the inner wall of the U-shaped block 201 fit together, and at the same time, make the limiting column 203 pass through the first through hole 105 and extend to the right side of the first support block 103, and then pass the lower end of the first bolt 205 through the U-shaped block 201 and thread it into the wall layer of the support plate 101, so that the U-shaped block 201 can be quickly and stably fixed to the upper end of the support plate 101;

[0033] At this time, the second arc block 204 and the first arc block 104 will be limited on the outer wall of the fixing tube 8, so that the second arc block 204 and the first arc block 104 are suspended by the two fixing tubes 8 to achieve stable installation of the support plate 101;

[0034] Then, the insert block 501 is passed through the installation slots 302 on the first protective plate 301 and the second protective plate 401, and the second bolt 503 is passed through the first screw hole 304 from top to bottom and is threadedly installed on the inner wall of the second screw hole 502, so that the insert block 501 can be stably placed;

[0035] Pass one end of the mounting rod 602 through the mounting block 601 and the second through hole 307, and pass the other end of the mounting rod 602 through the holes through the mounting block 601 and the second U-shaped seat 404 at the front and rear ends, and then thread the internal threaded tube 603 on the outer wall of the mounting rod 602, so that the mounting rod 602 and the mounting block 601 can be fixed on the second U-shaped seat 404 and the first U-shaped seat 306. The two mounting rods 602 can be held in hand to facilitate the movement of the device. When disassembly is required, only the first bolt 205 and the second bolt 503 need to be removed to achieve rapid disassembly of the protective structure.

[0036] Through the above steps, when in use, the pressure reducing valve body 7 is placed on the upper end of the base plate assembly 1, and then the second protective assembly 4 is placed on the upper end of the base plate assembly 1, so that the second protective assembly 4 and the first protective assembly 3 protect the outside of the pressure reducing valve body 7. After that, the first locking assembly 2 is installed on the base plate assembly 1, the reinforcement assembly 5 is installed on the first protective assembly 3 and the second protective assembly 4, and the second locking assembly 6 is installed on the first protective assembly 3 and the second protective assembly 4. The base plate assembly 1, the first protective assembly 3 and the second protective assembly 4 can be quickly and stably installed on the outside of the pressure reducing valve body 7, which solves the problem that when the pressure reducing valve in the prior art is used for a long time in a negative pressure vacuum environment, the outside of the valve body lacks a protective structure, which makes the outer wall of the valve body easily corroded by humid gas and it is inconvenient to quickly install the protective structure.

[0037] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A pressure reducing valve for use in a negative pressure vacuum environment, comprising a bottom plate assembly (1); characterized in that: It also comprises a first locking assembly (2), a first protection assembly (3), a second protection assembly (4), a reinforcement assembly (5) and a second locking assembly (6); the upper end of the base assembly (1) is provided with a first locking assembly (2) for locking; the upper end of the base assembly (1) is provided with a first protection assembly (3) for protection; the upper end of the base assembly (1) is provided with a second protection assembly (4) for protection; the first protection assembly (3) and the second protection assembly (4) are provided with a reinforcement assembly (5) for reinforcement; the first protection assembly (3) and the second protection assembly (4) are provided with a second locking assembly (6) for locking; A pressure reducing valve body (7) is arranged inside the first protection component (3) and the second protection component (4); Fixed pipes (8) are installed on the air inlet and outlet ports of the pressure reducing valve body (7).

2. A pressure reducing valve for use in a negative pressure vacuum environment according to claim 1, characterized in that: The bottom plate assembly (1) comprises a support plate (101), a rubber plate (102), a first support block (103), a first arc-shaped block (104) and a first through hole (105); the rubber plate (102) is fixedly connected to the center of the upper end of the support plate (101); the first support block (103) is fixedly connected to the front and rear edges of the upper end of the support plate (101); the first arc-shaped block (104) is fixedly connected to the upper end of the first support block (103); two first through holes (105) are formed through the left and right ends of the first support block (103); the upper end of the rubber plate (102) is in contact with the lower end of the pressure reducing valve body (7).

3. A pressure reducing valve for use in a negative pressure vacuum environment according to claim 1, characterized in that: The first locking assembly (2) comprises a U-shaped block (201), a second support block (202), a limiting column (203), a second arc-shaped block (204) and a first bolt (205); the upper end of the support plate (101) is movably provided with the U-shaped block (201); the right end of the U-shaped block (201) is fixedly connected to two second support blocks (202) symmetrical about the center of the U-shaped block (201); the upper end of the second support block (202) is fixedly connected to the second arc-shaped block (204); the right end of the second support block (202) is fixedly connected to the two limiting columns (203); ); the outer wall of the limiting column (203) is fitted with the inner wall of the first through hole (105); a first bolt (205) is threadedly installed through the middle of the upper and lower ends of the U-shaped block (201); the lower end of the first bolt (205) passes through the U-shaped block (201) and is threadedly installed in the wall layer of the support plate (101); the right end of the second arc block (204) and the left end of the first arc block (104) are fitted to form a circular ring structure; the circular structure formed by the inner walls of the second arc block (204) and the first arc block (104) is fitted with the outer wall of the fixing tube (8).

4. A pressure reducing valve for use in a negative pressure vacuum environment according to claim 2, characterized in that: The first protection component (3) comprises a first protection plate (301), a mounting groove (302), a first arc-shaped plate (303), a first screw hole (304), a first groove body (305), a first U-shaped seat (306) and a second through hole (307); the first protection plate (301) is fixedly connected to the right edge of the upper end of the support plate (101); the first arc-shaped plates (303) symmetrical about the center of the first protection plate (301) are penetrated through the upper parts of the left and right ends of the first protection plate (301); the first arc-shaped plate (303) is fixedly connected to the upper end of the first protection plate (301); The first arc-shaped plate (303) is provided with first screw holes (304) at both ends; the first arc-shaped plate (303) is provided with first grooves (305) at both ends; the first grooves (305) are provided through the left end of the first arc-shaped plate (303); the upper end of the first arc-shaped plate (303) is fixedly connected to a first U-shaped seat (306) symmetrical with respect to the center of the first arc-shaped plate (303); the front and rear ends of the first U-shaped seat (306) are provided with second through holes (307); the inner wall of the first groove (305) is in contact with the outer wall of the upper end of the pressure reducing valve body (7).

5. A pressure reducing valve for use in a negative pressure vacuum environment according to claim 4, characterized in that: The second protection assembly (4) comprises a second protection plate (401), an arc-shaped groove (402), a second arc-shaped plate (403) and a second U-shaped seat (404); the second protection plate (401) is movably arranged at the left edge of the upper end of the support plate (101); the arc-shaped groove (402) is penetrated through the front and rear ends of the second protection plate (401); the arc-shaped groove (402) is penetrated through the right end of the second protection plate (401); the second protection plate (401) and the first protection plate (301) have the same structure; the inner portion of the arc-shaped groove (402) is provided with a plurality of arc-shaped grooves (403) and a plurality of arc-shaped grooves (403) and a plurality of arc-shaped grooves (403) are provided with the plurality of arc-shaped grooves (403) and the ... The wall is fitted with the outer wall of the fixed tube (8); the upper end of the second protective plate (401) is fixedly connected with the second curved plate (403); the second curved plate (403) and the first curved plate (303) are of the same structure; the upper end of the second curved plate (403) is fixedly connected with a second U-shaped seat (404) symmetrical about the center of the second curved plate (403); the right end of the second U-shaped seat (404) and the left end of the first curved plate (303) are fitted to form a circular ring structure; the outer wall of the second protective plate (401) is fitted with the inner wall of the U-shaped block (201).

6. The pressure reducing valve for use in a negative pressure vacuum environment according to claim 4, characterized in that: The reinforcement component (5) comprises an insert block (501), a second screw hole (502) and a second bolt (503); the insert block (501) is movably provided on the inner wall of the installation groove (302); the insert block (501) is in a "U"-shaped structure; the left end of the insert block (501) passes through the second protective plate (401) and extends to the left of the second protective plate (401); the second screw hole (502) is provided through the upper and lower ends of the insert block (501); the second bolt (503) is threadedly installed on the inner wall of the second screw hole (502); the outer wall of the second bolt (503) is threadedly connected to the inner wall of the first screw hole (304).

7. The negative pressure vacuum environment pressure reducing valve according to claim 5, characterized in that: The second locking assembly (6) comprises a mounting block (601), a mounting rod (602) and an internally threaded barrel (603); the mounting block (601) is movably provided on the inner wall of the first U-shaped seat (306) and the inner wall of the second U-shaped seat (404); the mounting rod (602) is movably provided through the front and rear ends of the mounting block (601); the outer wall of the mounting rod (602) and the inner wall of the second through hole (307) are fitted; the internally threaded barrel (603) is threadedly installed on the outer wall of the mounting rod (602) and the outer walls at both ends of the mounting rod (602).

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