Pressure gradient valve

Abstract

The utility model relates to a pressure gradient valve which comprises a valve body and a filter screen detachably fixed to one end of the valve body and further comprises a flow channel, a supporting piece, a spring plate, a supporting shaft, a sliding piece, a spring and a spring pressing cover, and an annular flange plate is fixed to the inner wall of the valve body; the edge of one end of the flow channel is detachably fixed to the edge of the opening in one end of the valve body, the other end of the flow channel is detachably fixed to the annular flange plate, and the edge of the supporting piece is detachably fixed to the annular flange plate. One end of the supporting shaft is detachably fixed to the center of the supporting piece, and the other end of the supporting shaft is detachably and fixedly connected with the spring pressing cover. The spring plate is fixed to the outer side of the sliding piece and used for sealing an opening in one end of the runner, the sliding piece is arranged on the supporting shaft in a sliding mode, and the spring is arranged between the spring pressing cover and the sliding piece and arranged on the outer side of the supporting shaft in a sleeving mode. The structure is more stable and simple, assembly and maintenance are convenient, the device can adapt to different pressure flow grades, the application range is wide, and the measurement precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of gradient valves, and in particular to a pressure gradient valve. Background Art

[0002] Reference Figure 1-Figure 3 , which is a gradient valve design in the prior art, mainly includes a valve body and a spring pressure plate, a spring, a support shaft, a long bolt, a sliding nylon bearing, a spring plate, a flow channel, a filter and a flange plate, wherein the flange plate, the filter and the flow channel are connected to one end of the valve body near the high pressure area by bolts, the support shaft is fixed to the flange plate by bolts, the support shaft is inserted into the valve body, the long bolt passes through the support shaft and is threadedly connected to the spring pressure cover, the inner wall of the sliding nylon bearing is slidably matched with the outer wall of the support shaft, the outer wall of the sliding nylon bearing is fixedly connected to the spring plate, and the spring is arranged between the spring pressure cover and the sliding nylon bearing. When the airflow passes through the filter from the high pressure area and flows into the cavity of the flow channel, the pressure will cause the spring plate to drive the sliding nylon bearing to slide on the support shaft toward the low pressure area. At this time, the spring is compressed and compacted to accumulate elastic force, the opening between the spring plate and the flow channel is opened, and the airflow flows from the cavity of the flow channel to the low pressure area, realizing the opening of the gradient valve. When the pressure on both sides of the valve body is balanced, the spring naturally recovers to provide elastic force to drive the sliding nylon bearing to drive the spring plate to press against the flow channel, thereby closing the gradient valve.

[0003] The above-mentioned existing technical solutions have the following defects: on the one hand, the length of the support shaft inside the existing valve body is relatively long, and it is necessary to open a reverse threaded deep hole in the support shaft to match the long bolt, which is difficult to process. On the other hand, one end of the support shaft is fixed to the flange plate by bolts, so that the support shaft forms a long cantilever structure, and the structural stability and rigidity are poor. In addition, the end of the valve body close to the high-pressure area is equipped with a flow channel, a filter screen and a flange plate, so that the end of the valve body close to the high-pressure area is a multi-layer plate-like superimposed structure, which not only has poor assembly and maintainability, but also has poor concentricity because there is no positioning shoulder. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a pressure gradient valve which has a more stable structure, a simple structure, is easy to assemble and maintain, can adapt to different pressure and flow levels, has a wide range of applications and high measurement accuracy.

[0005] The above practical purpose of this utility model is achieved through the following technical solutions:

[0006] A pressure gradient valve comprises a valve body and a filter screen detachably fixed at one end of the valve body, a flow channel, a support member, a support shaft, a spring, a spring pressing cover and a sliding member, wherein an annular flange plate is fixed on the inner wall of the valve body;

[0007] The edge of one end of the flow channel can be detachably fixed to the edge of the opening of one end of the valve body, and the other end can be detachably fixed to the annular flange plate, and the edge of the support member can be detachably fixed to the annular flange plate;

[0008] One end of the support shaft is detachably fixed to the center of the support member, and the other end is detachably fixedly connected to the spring compression cover;

[0009] The spring is arranged between the spring pressing cover and the sliding member and is sleeved on the outer side of the supporting shaft. The sliding member is used to open or close the opening at one end of the flow channel.

[0010] As a further technical solution of the present invention: a fixed shoulder flange is integrally formed and fixedly connected to the inner wall of one end of the valve body, and the edge of one end of the flow channel is embedded in the positioning shoulder between the filter screen and the fixed shoulder flange, and the filter screen and the edge of the flow channel are detachably fixed to one end of the valve body by multiple bolts.

[0011] As a further technical solution of the present invention: the support member comprises a plurality of connecting arms and an inner ring, an outer ring and a sleeve which are arranged concentrically, the plurality of connecting arms are integrally formed and fixedly connected between the inner ring and the outer ring and are evenly distributed, and one end of the sleeve is welded to the inner ring as a whole;

[0012] The edge of the flow channel at one end away from the filter screen and the outer ring are detachably fixed to the annular flange plate by a plurality of bolts.

[0013] As a further technical solution of the present invention: the sliding member comprises a spring plate, a nylon bearing bush and a central sleeve, and the sleeve is fixed on the outer wall of the support shaft;

[0014] The shaft sleeve is welded to the support member as a whole, and the spring plate is welded to the center sleeve as a whole;

[0015] The spring plate is used to seal the opening at one end of the flow channel, the sliding member is slidably arranged on the support shaft, and the spring is arranged between the spring pressing cover and the sliding member and sleeved on the outer side of the support shaft;

[0016] The nylon bearing is slidably arranged on the shaft sleeve and is sleeved in the central sleeve. One end of the nylon bearing is fixed on the spring plate. The central sleeve is fixed on the nylon bearing. The spring is arranged between the central sleeve and the spring pressing cover.

[0017] As a further technical solution of the present invention: an annular rubber ring is fixed to a side of the outer ring away from the flow channel, and an edge of the spring plate is pressed against the annular rubber ring.

[0018] As a further technical solution of the present invention: one end of the support shaft is embedded in the groove of the inner ring, and the support shaft is detachably fixed to the inner ring through a fastening screw and a flow baffle, and the diameter of the flow baffle is larger than the diameter of the inner ring.

[0019] As a further technical solution of the present invention: the edge of the flow baffle is bent toward the spring plate.

[0020] As a further technical solution of the present invention: it also includes an adjusting screw, the spring clamping cover is provided with an adjustable spring space for inserting the support shaft, one end of the adjusting screw passes through the spring clamping cover and the adjustable spring space and is threadedly connected to the support shaft, and the tightness of the spring can be adjusted by screwing the adjusting screw.

[0021] As a further technical solution of the present invention: one end of the flow channel is expanded outward and the inner wall is arranged in a circular arc ring surface.

[0022] In summary, the present invention has at least one of the following beneficial technical effects:

[0023] The utility model discloses a pressure gradient valve, which redesigns the flow channel of the flow channel and installs the fixed end of the support shaft inside the valve body, so that the support point is located in the middle of the valve body, and the structure is more stable than the existing design. The structure is simple, the original multi-layer plate design at one end of the valve body is cancelled, the concentricity of the valve body parts is guaranteed, and the assembly and maintenance are convenient. The flow baffle can be replaced to adapt to different pressure and flow levels, and the application range is wide and the measurement accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an existing pressure gradient valve in the background technology of the present utility model.

[0025] Figure 2 It is a planar cross-sectional view of a conventional pressure gradient valve in the background technology of the present utility model.

[0026] Figure 3 It is a three-dimensional cross-sectional view of a conventional pressure gradient valve in the background technology of the present invention.

[0027] Figure 4 The overall structure diagram of the utility model is as follows:

[0028] Figure 5 It is a three-dimensional diagram of the utility model.

[0029] Figure 6 It is a plan cross-sectional view of the utility model.

[0030] Figure 7 It is a three-dimensional cross-sectional view of the utility model.

[0031] Figure numerals: 1. valve body; 11. annular flange plate; 12. fixed shoulder flange; 13. positioning shoulder; 2. filter screen; 3. flow channel; 4. support member; 41. connecting arm; 42. inner ring; 43. outer ring; 44. bushing; 431. annular rubber ring; 6. support shaft; 61. fastening screw; 62. flow baffle; 7. sliding member; 71. spring plate; 72. nylon bearing; 73. center sleeve; 8. spring; 9. spring pressure cover; 91. adjusting screw; 92. spring adjustable space. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Embodiment 1:

[0036] Reference Figure 4-Figure 7 , is a pressure gradient valve disclosed in the present utility model, comprising a valve body 1 and a filter screen 2 detachably fixed to one end of the valve body 1, and also comprising a flow channel 3, a support member 4, a support shaft 6, a spring 8, a spring clamping cover 9 and a sliding member 7, and an annular flange plate 11 is fixed on the inner wall of the valve body 1.

[0037] The edge of one end of the flow channel 3 is detachably fixed to the edge of the opening at one end of the valve body 1, and the other end is detachably fixed to the annular flange plate 11, and the edge of the support member 4 is detachably fixed to the annular flange plate 11. One end of the support shaft 6 is detachably fixed to the center of the support member 4, and the other end is detachably fixedly connected to the spring compression cover 9. The spring 8 is arranged between the spring compression cover 9 and the sliding member 7 and is sleeved on the outside of the support shaft 6. The sliding member 7 is used to open or close the opening at one end of the flow channel 3.

[0038] After one end of the flow channel 3 is expanded, the inner wall is set in a circular arc ring surface, so that the inner wall of the flow channel 3 is set in an arc shape, and in this embodiment, the support shaft 6 is made of aluminum alloy material, which has better processability, lower cost and lighter weight; the support point of the support shaft 6 is located in the middle position inside the valve body 1, which makes the structure more stable, and also reduces the depth of the threaded hole, making processing, assembly and maintenance more convenient. The valve body 1 is cylindrical, and one side is a high-pressure area, and the other side is a low-pressure area. The edge of one end of the valve body 1 is integrally formed and fixedly connected with a flange. Compared with the prior art, the cylindrical wall thickness of the valve body 1 is thinner, the cost is lower, and it is lighter. In terms of appearance, the overall outer contour and interface of the valve body 1 are consistent with the original design. The flow channel of the flow channel 3 is made of aluminum alloy material, which has better processability, lower cost and lighter weight.

[0039] A fixed shoulder flange 12 is integrally formed and fixedly connected to the inner wall at one end of the valve body 1, and the edge of one end of the flow channel 3 is embedded in the positioning shoulder 13 between the filter screen 2 and the fixed shoulder flange 12. The filter screen 2 and the edge of the flow channel 3 are detachably fixed to one end of the valve body 1 by multiple bolts. Furthermore, the bolts pass through the edge of the filter screen 2 and the edge of the flow channel 3 and are threadedly connected to the fixed shoulder flange 12.

[0040] The support member 4 includes a plurality of connecting arms 41 and an inner ring 42, an outer ring 43 and a sleeve 44 which are arranged concentrically. The plurality of connecting arms 41 are integrally formed and fixedly connected between the inner ring 42 and the outer ring 43 and are evenly distributed. One end of the sleeve 44 is welded to the inner ring 42 as a whole. In this embodiment, four connecting arms 41 are provided. The edge of the end of the flow channel 3 away from the filter screen 2 and the outer ring 43 are detachably fixed to the annular flange plate 11 by a plurality of bolts. Furthermore, one end of the bolt passes through the outer ring 43 and the annular flange plate 11 and is threadedly connected to the edge of the end of the flow channel 3. An annular rubber ring 431 is fixed to the side of the outer ring 43 away from the flow channel 3, and the edge of the spring plate 71 is pressed against the annular rubber ring 431.

[0041] One end of the support shaft 6 is embedded in the groove of the inner ring 42. The support shaft 6 is detachably fixed to the inner ring 42 through the fastening screw 61 and the flow baffle 62. The diameter of the flow baffle 62 is larger than the diameter of the inner ring 42, and the edge of the flow baffle 62 is bent toward the spring plate 71. One end of the fastening screw 61 passes through the flow baffle 62 and is threadedly connected to the support shaft 6. In this embodiment, the flow baffle 62 can be replaced to adapt to different pressure and flow levels; and the fastening screw 61 adopts a round head screw design to reduce the disturbance of the airflow and improve the measurement accuracy.

[0042] The sliding member 7 includes a spring plate 71, a nylon bearing 72 and a center sleeve 73. The sleeve 44 is fixed on the outer wall of the support shaft 6. The sleeve 44 is welded to the support member 4 as a whole. The spring plate 71 is welded to the center sleeve 73 as a whole. The nylon bearing 72 and the spring plate 71 are welded to a whole. The spring plate 71 is used to seal the opening at one end of the flow channel 3. The sliding member 7 is slidably set on the support shaft 6. The spring 8 is set between the spring clamping cover 9 and the sliding member 7 and is sleeved on the outside of the support shaft 6.

[0043] The nylon bearing bush 72 is slidably arranged on the shaft sleeve 44 and sleeved in the center sleeve 73. One end of the nylon bearing bush 72 is fixed on the spring plate 71. The center sleeve 73 is fixed on the nylon bearing bush 72. The spring 8 is arranged between the center sleeve 73 and the spring pressing cover 9. It also includes an adjusting screw 91. The spring pressing cover 9 is provided with a spring adjustable space 92 for inserting the support shaft 6. One end of the adjusting screw 91 passes through the spring pressing cover 9 and the spring adjustable space 92 and is threadedly connected with the support shaft 6. The tightness of the spring 8 can be adjusted by screwing the adjusting screw 91. In this embodiment, the nylon bearing bush 72 is made of nylon, which has a smaller friction coefficient, a lighter weight, and a lower cost.

[0044] When the airflow passes through the filter 2 from the high-pressure area and flows into the flow channel of the flow channel 3, the pressure will cause the spring plate 71 with the nylon bearing bush 72 and the center sleeve 73 to slide on the sleeve 44 toward the low-pressure area. At this time, the spring 8 is compressed and compressed to accumulate elastic force, and the opening between the spring plate 71 and the outer ring 43 is opened, and the airflow flows from the flow channel of the flow channel 3 to the low-pressure area, realizing the opening of the gradient valve. When the pressure on both sides of the valve body 1 is balanced, the spring 8 naturally recovers to provide elastic force to drive the nylon bearing bush 72 and the center sleeve 73 to drive the spring plate 71 to press against the annular rubber ring 431 of the outer ring 43, realizing the closing of the gradient valve.

[0045] The implementation principle of the utility model is as follows: the utility model discloses a pressure gradient valve, which redesigns the flow channel of the flow channel 3 and installs the fixed end of the support shaft 6 inside the valve body 1, so that the support point is located in the middle of the valve body 1, and the structure is more stable than the existing design. And the structure is simple, the original multi-layer plate design at one end of the valve body 1 is cancelled, the concentricity of the valve body 1 components is ensured, and the assembly and maintenance are convenient. The flow baffle 62 can be replaced to adapt to different pressure and flow levels, and the application range is wide and the measurement accuracy is high.

[0046] The embodiments of this specific implementation method are all preferred embodiments of this utility, and are not intended to limit the protection scope of this utility. Therefore, all equivalent changes made based on the structure, shape, and principle of this utility should be included in the protection scope of this utility.

Claims

1. A pressure gradient valve, comprising a valve body (1) and a filter screen (2) detachably fixed to one end of the valve body (1), characterized in that: It also includes a flow channel (3), a support member (4), a support shaft (6), a spring (8), a spring pressing cover (9) and a sliding member (7); an annular flange plate (11) is fixed on the inner wall of the valve body (1); The edge of one end of the flow channel (3) is detachably fixed to the edge of an opening at one end of the valve body (1), and the other end is detachably fixed to the annular flange plate (11), and the edge of the support member (4) is detachably fixed to the annular flange plate (11); One end of the support shaft (6) is detachably fixed to the center of the support member (4), and the other end is detachably fixedly connected to the spring compression cover (9); The spring (8) is arranged between the spring pressing cover (9) and the sliding member (7) and is sleeved on the outside of the support shaft (6); the sliding member (7) is used to open or close the opening at one end of the flow channel (3).

2. A pressure gradient valve according to claim 1, characterized in that: A fixed shoulder flange (12) is integrally formed and fixedly connected to the inner wall of one end of the valve body (1), and the edge of one end of the flow channel (3) is embedded in a positioning shoulder (13) between the filter screen (2) and the fixed shoulder flange (12), and the filter screen (2) and the edge of the flow channel (3) are detachably fixed to one end of the valve body (1) by a plurality of bolts.

3. A pressure gradient valve according to claim 2, characterized in that: The support member (4) comprises a plurality of connecting arms (41) and an inner ring (42), an outer ring (43) and a shaft sleeve (44) which are arranged concentrically; the plurality of connecting arms (41) are integrally formed and fixedly connected between the inner ring (42) and the outer ring (43) and are evenly distributed; one end of the shaft sleeve (44) is welded to the inner ring (42) as a whole; The edge of the flow channel (3) at one end away from the filter screen (2) and the outer ring (43) are detachably fixed to the annular flange plate (11) by means of a plurality of bolts.

4. A pressure gradient valve according to claim 3, characterized in that: The sliding member (7) comprises a spring plate (71), a nylon bearing bush (72) and a central sleeve (73), and the sleeve (44) is fixed on the outer wall of the support shaft (6); The shaft sleeve (44) and the support member (4) are welded into one piece, and the spring plate (71) and the center sleeve (73) are welded into one piece; The spring plate (71) is used to seal the opening at one end of the flow channel (3); the sliding member (7) is slidably arranged on the support shaft (6); the spring (8) is arranged between the spring pressing cover (9) and the sliding member (7) and is sleeved on the outer side of the support shaft (6); The nylon bearing (72) is slidably arranged on the shaft sleeve (44) and sleeved in the central sleeve (73), one end of the nylon bearing (72) is fixed on the spring plate (71), the central sleeve (73) is fixed on the nylon bearing (72), and the spring (8) is arranged between the central sleeve (73) and the spring clamping cover (9).

5. A pressure gradient valve according to claim 4, characterized in that: An annular rubber ring (431) is fixed to a side of the outer ring (43) away from the flow channel (3), and an edge of the spring plate (71) is pressed against the annular rubber ring (431).

6. A pressure gradient valve according to claim 4, characterized in that: One end of the support shaft (6) is embedded in a groove of the inner ring (42); the support shaft (6) is detachably fixed to the inner ring (42) via a fastening screw (61) and a flow baffle (62); the diameter of the flow baffle (62) is greater than the diameter of the inner ring (42).

7. A pressure gradient valve according to claim 6, characterized in that: The edge of the flow baffle (62) is bent in a direction toward the spring plate (71).

8. A pressure gradient valve according to claim 1, characterized in that: It also includes an adjusting screw (91), the spring clamping cover (9) is provided with a spring adjustable space (92) for inserting the support shaft (6), one end of the adjusting screw (91) passes through the spring clamping cover (9) and the spring adjustable space (92) and is threadedly connected to the support shaft (6), and the tightness of the spring (8) can be adjusted by screwing the adjusting screw (91).

9. A pressure gradient valve according to claim 1, characterized in that: One end of the flow channel (3) is expanded outwards and the inner wall is arranged in the form of an arc ring surface.

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