A negative pressure drain valve

Abstract

The utility model discloses a kind of negative pressure drain valve, including main body shell, the utility model is suitable for negative pressure drainage system by the working pressure of main body shell is negative pressure, main body shell is suitable for humid and the environment of greater temperature difference, while the interface type of main body shell is straight pipe type, can be quickly disassembled, quick connect silica gel pipeline, while main body shell inside opens and closes without electricity, simple structure, good airtightness, low failure rate, maintenance-free, production cost is low, effectively conveniently used for dredging negative pressure drainage pipeline's water plug phenomenon, realized the function of low opening of negative pressure degree, high closing of negative pressure degree, switch uses open-close spring piece jump change mode, without micro-open, half-open situation, water plug point's water impact force is big, drainage efficiency is high, effect is obvious, can well balance the pressure in negative pressure pipeline, improve the stability of system negative pressure, according to the length and pipe loss of negative pressure pipeline, the opening and closing negative pressure value of main body shell can be adjusted by pressure regulating screw, different scenes are responded.

Description

Technical Field

[0001] This utility model relates to the field of steam trap technology, and in particular to a negative pressure steam trap. Background Technology

[0002] Steam traps are mainly used to drain liquid from inside the system pipeline to maintain the normal operation of the pipeline system. Currently, most steam traps have the following two opening and closing methods: Method 1: electrically driven valve opening and closing method; Method 2: differential pressure driven method. However, the above opening and closing methods have the following drawbacks: 1. The opening of the negative pressure steam trap is continuous, with the air intake gradually increasing, resulting in a small drainage force; 2. The system is sometimes slightly open, partially open, or not tightly closed, resulting in low drainage efficiency, slow negative pressure rise, and high energy consumption. 3. The opening and closing points of the negative pressure cannot be adjusted as needed; 4. When using electrical control: there are many components, the cost is high, the failure rate is high, and it is not suitable for humid environments or places with large temperature differences. Therefore, we propose a negative pressure drain valve to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a negative pressure drain valve.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A negative pressure drain valve includes a main body shell. An upper shell and a lower shell are respectively mounted to the upper and lower ends of the main body shell via limiting bolts. A diaphragm assembly is installed between the main body shell and the upper shell. A triggering mechanism is provided inside the main body shell, and an opening / closing assembly is connected to the lower end of the triggering mechanism. An installation tube is fixedly connected to the upper surface of the upper shell, and a pressure adjusting screw is threaded into the top end of the installation tube. A pressure adjusting spring abuts below the pressure adjusting screw. A negative pressure vent platform is provided on the inner wall of the main body shell. A limiting platform is fixedly connected to the inner wall of the lower shell below the negative pressure vent platform. A negative pressure interface is connected to the outer side of the main body shell. A throttling valve is connected to the lower part of the lower shell. A support plate is installed on the upper part of the upper shell.

[0005] Preferably, four limiting bolts are provided, and anti-slip pads are provided below the nuts of the four limiting bolts.

[0006] Preferably, sealing rings are provided at both the upper and lower ends of the main body shell.

[0007] Preferably, the diaphragm assembly includes a diaphragm body, the diaphragm body is placed on the upper end of the main body shell, and a fixing plate is fixedly connected to the lower part of the diaphragm body.

[0008] Preferably, a cylinder is fixedly connected to the upper part of the diaphragm, and the pressure regulating spring is sleeved on the surface of the cylinder below.

[0009] Preferably, the triggering mechanism includes a travel limiting step, the travel limiting step is fixedly connected to the upper part of the inner wall of the main body shell, and a bushing is installed on the inner wall of the travel limiting step. A push-pull rod is inserted into the bushing, and a top cover is fixedly connected to the upper part of the push-pull rod. A return spring is welded between the push-pull rod and the top cover.

[0010] Preferably, the opening and closing assembly includes an opening and closing spring, an opening and closing spring is inserted below the push-pull rod, and an M-shaped spring is installed inside the opening and closing spring. One end of the opening and closing spring is connected to the lower surface of the main body shell by a spring fixing screw, and an elastic sealing gasket is glued to the other end of the opening and closing spring.

[0011] Preferably, the opening and closing spring has a U-shaped through hole inside, a fixing plate is fixedly connected inside the opening and closing spring, the cross-section of the M-shaped spring is set to M-shape, and through holes adapted to the fixing plate are opened at both ends of the M-shaped spring for connection with the opening and closing spring.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This device operates under negative pressure through its main casing, making it suitable for negative pressure drainage systems. The main casing is made entirely of PVC with SUS304 components, ensuring excellent sealing and suitability for humid environments with large temperature differences, thus preventing rust. The casing features a straight-pipe interface for quick-connect and disconnection of silicone tubing. The internal opening and closing mechanism requires no electricity, resulting in a simple structure, excellent sealing, low failure rate, maintenance-free operation, and low manufacturing cost. It effectively unclogs waterlogged areas in negative pressure drainage pipes, enabling opening at low negative pressure and closing at high negative pressure. The switch uses a spring-loaded mechanism, eliminating the possibility of partial or open opening, providing a strong impact force on waterlogged areas, resulting in high drainage efficiency and noticeable effects. It effectively balances the pressure within the negative pressure pipe, improving the stability of the system's negative pressure. The opening and closing negative pressure value of the main casing can be adjusted via an adjusting screw according to the length and pipe loss of the negative pressure pipe, adapting to different scenarios. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of a negative pressure drain valve proposed in this utility model; Figure 2 This is a three-dimensional bottom view of a negative pressure drain valve proposed in this utility model; Figure 3 This is a three-dimensional exploded view of a negative pressure drain valve proposed in this utility model; Figure 4 for Figure 1A three-dimensional cross-sectional schematic diagram of the main outer shell and the upper shell structure; Figure 5 for Figure 1 A three-dimensional schematic diagram of the push-pull rod and opening / closing assembly structure; Figure 6 for Figure 1 A three-dimensional schematic diagram of the opening and closing spring and the M-shaped spring structure.

[0014] In the diagram: 1. Main outer shell; 2. Limiting bolt; 3. Upper shell; 4. Lower shell; 5. Diaphragm assembly; 51. Diaphragm body; 52. Fixing plate; 6. Triggering mechanism; 61. Travel limit step; 62. Bushing; 63. Push-pull rod; 64. Top cover; 65. Return spring; 7. Opening and closing assembly; 71. Spring clip fixing screw; 72. Opening and closing spring clip; 73. M-shaped spring clip; 74. Elastic sealing gasket; 8. Installation pipe; 9. Pressure adjusting screw; 10. Pressure adjusting spring; 11. Negative pressure air inlet platform; 12. Limiting platform; 13. Support plate; 14. Negative pressure interface; 15. Throttling valve. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Reference Figure 1-6A negative pressure drain valve includes a main body shell 1. An upper shell 3 and a lower shell 4 are respectively mounted to the upper and lower ends of the main body shell 1 via limiting bolts 2. Four limiting bolts 2 are provided, and anti-slip pads are provided below the nuts of the four limiting bolts 2. The use of four limiting bolts 2 increases the installation stability between the main body shell 1, the upper shell 3, and the lower shell 4. The anti-slip pads below the nuts provide anti-slip properties. Sealing rings are provided at both the upper and lower ends of the main body shell 1 to increase the sealing between the main body shell 1 and the upper shell 3 and the lower shell 4, respectively. A diaphragm assembly 5 is installed between the main body shell 1 and the upper shell 3. The diaphragm assembly 5 includes a diaphragm body 51. A diaphragm body 51 is placed on the upper end of the shell 1, and a fixing plate 52 is fixedly connected to the lower part of the diaphragm body 51. The fixing plate 52 can provide auxiliary support. A cylinder is fixedly connected to the upper part of the diaphragm body 51, and the lower part of the pressure regulating spring 10 is sleeved on the surface of the cylinder. The cylinder fixed to the upper part of the diaphragm body 51 can facilitate the positioning and installation of the pressure regulating spring 10. A triggering mechanism 6 is provided inside the main shell 1, and an opening and closing component 7 is connected to the lower end of the triggering mechanism 6. The triggering mechanism 6 includes a travel limit step 61. The travel limit step 61 is fixedly connected to the upper part of the inner wall of the main shell 1, and a bushing 62 is installed on the inner wall of the travel limit step 61. The inner wall size of the travel limit step 61 is adapted to the surface size of the bushing 62. A push-pull rod 63 is inserted into the bushing 62. The lower inner wall of the travel limit step 61 has a through hole adapted to the push-pull rod 63, which allows the push-pull rod 63 to move easily along the through hole. A top cover 64 is fixedly connected to the top of the push-pull rod 63. A return spring 65 is welded between the push-pull rod 63 and the top cover 64. The return spring 65 can easily push the top cover 64 and the push-pull rod 63. The opening and closing assembly 7 includes an opening and closing spring 72. The opening and closing spring 72 is inserted into the lower part of the push-pull rod 63, and an M-shaped spring 73 is installed inside the opening and closing spring 72. One end of the opening and closing spring 72 is connected to the lower surface of the main body shell 1 through the spring fixing screw 71. An elastic sealing gasket 74 is glued to the other end of the opening and closing spring 72. The elastic sealing gasket 74 can buffer and seal the negative pressure air port platform 11. The spring 72 has a U-shaped through hole inside, which allows an elastic sheet to be formed inside. A fixing plate is fixedly connected inside the spring 72. The cross-section of the M-shaped spring 73 is M-shaped. Both ends of the M-shaped spring 73 have through holes that match the fixing plate for connection with the spring 72. The M-shaped spring 73 is fitted into the fixing plate at both ends, which facilitates the positioning and installation of the M-shaped spring 73. At the same time, the spring 72 can drive the elastic sealing gasket 74 to move up and down elastically. The upper surface of the upper housing 3 is fixedly connected to the mounting tube 8, and the top end of the mounting tube 8 is threaded with an adjusting screw 9. The mounting tube 8 and the upper housing 3 are an integral part. The mounting tube 8 is an internally threaded boss for connecting the adjusting bolt 9.The pressure adjusting screw 9 is a perforated hexagonal plug. A pressure adjusting spring 10 is located below the pressure adjusting screw 9. A negative pressure vent platform 11 is provided on the inner wall of the main body shell 1. A limiting platform 12 is fixedly connected to the lower part of the inner wall of the lower shell 4 below the negative pressure vent platform 11. A negative pressure interface 14 is connected to the outer side of the main body shell 1. A throttle valve 15 is connected to the lower part of the lower shell 4. A support plate 13 is installed on the upper part of the upper shell 3.

[0017] Working principle: When this utility model is in use, the main body shell 1, according to the attached... Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 and attached Figure 6 Initial state: The pressure difference of the negative pressure interface 14 is 0, the diaphragm body 51 is not subject to the suction force generated by the negative pressure, the return spring 65 overcomes the elastic force of the M-shaped spring 73 and the pressure regulating spring 10, and pushes the push-pull rod 63 upward to the limit position. The head elastic sealing gasket 74 on the opening and closing spring 72 falls down and disengages from the negative pressure air port platform 11. The return spring 65 is in the extended state. At this time, the space switch chamber below the main body shell 1, the space negative pressure chamber above the main body shell 1, and the negative pressure interface 14 are connected to the atmosphere, and the system is in the open state.

[0018] Closing Process: When the negative pressure at negative pressure interface 14 increases, the airflow rate into the negative pressure pipeline is controlled by adjusting the opening of the throttle valve 15. At this time, air is injected into the pipeline, and some water is flushed away by the air towards the negative pressure center station. The negative pressure loss in the pipeline decreases, and the negative pressure increases accordingly. The force on the diaphragm body 51 also increases. After overcoming the forces of the return spring 65, it drives the support plate 13 downward and pushes the push-pull rod 63 downward. At the same time, the M-shaped spring 73 is compressed. When the push-pull rod 63 reaches a certain displacement, the elastic force of the M-shaped spring 73 suddenly changes direction. The M-shaped spring 73 is forced to suddenly tilt upwards, and under the action of the M-shaped spring 73, the elastic sealing gasket 74 of its head is pressed against the negative pressure air port platform 11, isolating the space switch chamber below the main body shell 1 and the space negative pressure chamber above the main body shell 1. At this time, no more air enters the pipeline, and the negative pressure value in the space switch chamber below the main body shell 1 gradually approaches 0, and the closure ends. At this time, the air injected into the pipeline pushes the water plug to flow towards the central station, the water plug phenomenon disappears, the negative pressure is conducted backward and gradually rises, and the drainage process is completed.

[0019] Opening process: When the negative pressure in the negative pressure chamber above the main body shell 1 decreases, the force on the diaphragm 51 decreases. Under the action of the return spring 65, the diaphragm 51, support plate 13, and push-pull rod 63 are all driven upward. The M-shaped spring 73 is also compressed. When the whole reaches a certain displacement, the M-shaped spring 73 is compressed beyond the critical point, suddenly changing the direction of the elastic force, forcing the opening and closing spring 72 to fall down. The elastic sealing gasket 74 of the opening and closing spring 72 disengages from the negative pressure air port platform 11. At this time, the negative pressure chamber above the main body shell 1, the switch chamber below the main body shell 1, and the atmosphere are connected, and the opening is completed. At this time, air is drawn into the negative pressure pipe, some water is flushed away by the air, the negative pressure loss in the pipe decreases, and the negative pressure increases slowly. When the pressure value reaches the closing set point, the closing process begins.

[0020] Opening and closing settings: By adjusting the pressure adjusting screw 9, part of the spring force of the return spring 65 can be offset, allowing the negative pressure value for opening / closing to be set as needed, with a fluctuation range of 0-8 kPa. Tightening the pressure adjusting screw 9 will decrease the opening / closing value, and loosening it will increase the opening / closing value. The above is the complete working principle of this utility model.

[0021] In this utility model, the installation, connection or setting methods of all the components mentioned above are common mechanical methods, and the specific structure, model and coefficient index of all the components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be described in detail.

[0022] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

[0023] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside, and vertical and horizontal" in the terminology only represent the orientation of the term in its conventional use or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, numerals such as "first," "second," and "third" do not represent specific quantities or orders, but are only used to distinguish names. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A negative pressure drain valve, comprising a main body housing (1), characterized in that: The upper and lower shells (3 and 4) of the main shell (1) are respectively installed at the upper and lower ends by limiting bolts (2). A diaphragm assembly (5) is installed between the main shell (1) and the upper shell (3). A triggering mechanism (6) is provided inside the main shell (1), and an opening and closing assembly (7) is connected to the lower end of the triggering mechanism (6). An installation tube (8) is fixedly connected to the upper surface of the upper shell (3), and a pressure adjusting screw (9) is threaded into the top end of the installation tube (8). A pressure adjusting spring (10) is abutted below the pressure adjusting screw (9). A negative pressure air port platform (11) is opened on the inner wall of the main shell (1). A limiting platform (12) is fixedly connected to the inner wall of the lower shell (4) below the negative pressure air port platform (11). A negative pressure interface (14) is connected to the outer side of the main shell (1). A throttle valve (15) is connected to the lower part of the lower shell (4). A support plate (13) is installed above the upper shell (3).

2. The negative pressure steam trap according to claim 1, characterized in that, The limiting bolts (2) are provided in four parts, and anti-slip pads are provided below the nuts of the four limiting bolts (2).

3. A negative pressure drain valve according to claim 1, characterized in that, The main body shell (1) is provided with sealing rings at both the upper and lower ends.

4. A negative pressure drain valve according to claim 1, characterized in that, The diaphragm assembly (5) includes a diaphragm body (51), the diaphragm body (51) is placed on the upper end of the main body shell (1), and a fixing plate (52) is fixedly connected to the lower part of the diaphragm body (51).

5. A negative pressure drain valve according to claim 4, characterized in that, A cylinder is fixedly connected to the top of the diaphragm (51), and the pressure regulating spring (10) is sleeved on the surface of the cylinder below.

6. A negative pressure steam trap according to claim 1, characterized in that, The triggering mechanism (6) includes a travel limit step (61). The travel limit step (61) is fixedly connected to the upper part of the inner wall of the main body shell (1). A bushing (62) is installed on the inner wall of the travel limit step (61). A push-pull rod (63) is inserted inside the bushing (62). A top cover (64) is fixedly connected above the push-pull rod (63). A return spring (65) is welded between the push-pull rod (63) and the top cover (64).

7. A negative pressure drain valve according to claim 6, characterized in that, The opening and closing assembly (7) includes an opening and closing spring (72). The opening and closing spring (72) is inserted below the push-pull rod (63), and an M-shaped spring (73) is installed inside the opening and closing spring (72). One end of the opening and closing spring (72) is connected to the lower surface of the main body shell (1) through a spring fixing screw (71), and the other end of the opening and closing spring (72) is glued with an elastic sealing gasket (74).

8. A negative pressure drain valve according to claim 7, characterized in that, The opening and closing spring (72) has a U-shaped through hole inside, and a fixing plate is fixedly connected inside the opening and closing spring (72). The cross-section of the M-shaped spring (73) is set as M-shaped, and through holes adapted to the fixing plate are opened at both ends of the M-shaped spring (73) for connecting with the opening and closing spring (72).

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