Self-operated negative pressure regulating valve

Abstract

This invention discloses a self-operated negative pressure regulating valve, comprising a valve body, an upper negative pressure feedback chamber, an atmospheric chamber, a lower negative pressure feedback chamber, and a support. The valve body has an inlet and an outlet. A valve seat is disposed within the valve body, between the inlet and the outlet. The valve seat can be sealed by a valve core connected to the valve stem. The upper negative pressure feedback chamber is located below the valve body, the atmospheric chamber is located below the upper negative pressure feedback chamber, and the lower negative pressure feedback chamber is located below the atmospheric chamber. The support is located below the lower negative pressure feedback chamber. Both the upper and lower negative pressure feedback chambers have feedback ports. One end of the upper negative pressure feedback chamber is an upper diaphragm assembly, and one end of the lower negative pressure feedback chamber is a lower diaphragm assembly. The valve stem passes through the upper negative pressure feedback chamber, the atmospheric chamber, and the lower negative pressure feedback chamber and is connected to the upper and lower diaphragm assemblies. A counterweight is disposed at the end of the valve stem. This invention facilitates automatic adjustment of glove box pressure.

Description

Technical Field

[0001] This invention relates to a regulating valve, and more specifically, to a self-operated negative pressure regulating valve. Background Technology

[0002] The self-operated negative pressure regulating valve (hereinafter referred to as the "regulating valve") is mainly used to regulate the pressure inside the glove box. The inlet of the regulating valve is connected to the glove box, and the outlet is connected to a vacuum pump or negative pressure pipeline. A pressure testing pipe is also led out from the glove box and connected to the control diaphragm feedback chamber of the regulating valve. The negative pressure inside the glove box is regulated by the up-and-down movement of the valve core within the regulating valve, which controls the flow rate drawn from the glove box. This maintains the pressure inside the box within a stable negative pressure range, preventing the gas medium from overflowing and causing harm to the operator.

[0003] Existing control valves do not have automatic adjustment functions, which causes many inconveniences during use. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a self-operated negative pressure regulating valve that can automatically adjust based on the negative pressure of the glove box, in order to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a self-operated negative pressure regulating valve, comprising a valve body, an upper negative pressure feedback chamber, an atmospheric chamber, a lower negative pressure feedback chamber, and a support. The valve body has an inlet and an outlet. A valve seat is provided inside the valve body, between the inlet and the outlet. The valve seat can be sealed by a valve core connected to the valve stem. The upper negative pressure feedback chamber is located below the valve body. The atmospheric chamber is located below the upper negative pressure feedback chamber. The lower negative pressure feedback chamber is located below the atmospheric chamber. The support is supported below the lower negative pressure feedback chamber. Both the upper and lower negative pressure feedback chambers have feedback ports. One end of the upper negative pressure feedback chamber is an upper diaphragm assembly, and one end of the lower negative pressure feedback chamber is a lower diaphragm assembly. The valve stem passes through the upper negative pressure feedback chamber, the atmospheric chamber, and the lower negative pressure feedback chamber and is connected to the upper and lower diaphragm assemblies. A counterweight is provided at the end of the valve stem.

[0006] Preferably, the valve stem and the valve core are connected by a ball joint.

[0007] Preferably, the valve body is provided with an upper bellows, which is fitted onto the outside of the valve stem and isolates the inlet and outlet air pressure.

[0008] Preferably, the atmospheric chamber is provided with a lower bellows, which is fitted onto the outside of the valve stem. The lower bellows serves as a negative pressure channel and can verify the up-and-down movement of the valve stem.

[0009] Preferably, the upper diaphragm assembly is disposed at the lower end of the upper negative pressure feedback chamber.

[0010] Preferably, the lower diaphragm assembly is disposed at the lower end of the lower negative pressure feedback chamber.

[0011] Preferably, both the upper diaphragm assembly and the lower diaphragm assembly are made of EPDM material.

[0012] Preferably, the bracket is equipped with a limit switch, and a baffle is provided above the counterweight. The limit switch provides an extreme position warning by touching the baffle.

[0013] Preferably, the bracket has a waist-shaped hole extending longitudinally, and the limit switch is fixed by a threaded connector passing through the waist-shaped hole.

[0014] The self-operated negative pressure regulating valve of this invention has the following beneficial effects: When the negative pressure inside the glove box is higher than its set negative pressure, the pressure difference generated by the upper and lower diaphragm assemblies causes it to move upward, the valve core moves upward, the valve opening decreases, the flow rate of the medium through the regulating valve decreases, and the pressure inside the glove box rises until it reaches the set negative pressure range. When the negative pressure inside the glove box is lower than its set negative pressure, the valve core moves downward under the action of the valve counterweight, the valve opening increases, the flow rate of the medium through the regulating valve increases, the extraction flow rate at the glove box outlet increases, and the pressure inside the box decreases until it reaches the set negative pressure range. This regulating valve of the present invention can achieve automatic pressure regulation within a certain range. The valve stem and valve core are connected by a ball joint, which allows for automatic alignment. The use of upper and lower diaphragm assemblies in the regulating valve allows for adjustment even with slight changes in pressure inside the glove box, resulting in higher sensitivity. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0016] Figure 1 This is a cross-sectional view of an embodiment of the self-operated negative pressure regulating valve of the present invention.

[0017] 1-Bracket; 2-Counterweight; 3-Baffle; 4-Lower diaphragm assembly; 5-Upper diaphragm assembly; 6-Valve stem; 7-Valve body; 8-Valve core; 9-Valve seat; 10-Upper bellows; 11-Lower bellows; 12-Limit switch; 13-Oval hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings.

[0019] Reference Figure 1 As shown, the self-operated negative pressure regulating valve of the present invention includes a valve body 7, an upper negative pressure feedback chamber D, an atmospheric chamber B, a lower negative pressure feedback chamber A, and a support 1.

[0020] like Figure 1 As shown, valve body 7 has an inlet and an outlet. The inlet is located on the right side of the figure and is connected to the glove box. The outlet is located at the top of the figure and is connected to the negative pressure pump, etc.

[0021] A valve seat 9 is provided inside the valve body 7, between the inlet and outlet of the valve body 7. The valve seat 9 can be blocked by the valve core 8 connected to the valve stem 6. When the valve core 8 is blocked by the valve seat 9, the inlet and outlet of the valve body 7 are blocked; when the valve core 8 leaves the valve seat 9, the inlet and outlet of the valve body 7 are connected, and the negative pressure pump can apply negative pressure to the valve body 7, thereby generating negative pressure in the glove box.

[0022] The upper negative pressure feedback chamber D is located below the valve body 7, as shown in the figure, forming an upper negative pressure feedback chamber D below the valve body 7. The atmospheric chamber B is located below the upper negative pressure feedback chamber D, and the lower negative pressure feedback chamber A is located below the atmospheric chamber B. The bracket 1 is supported below the lower negative pressure feedback chamber A. Both the upper negative pressure feedback chamber D and the lower negative pressure feedback chamber A have feedback ports, which are connected to pressure taps located away from the inlet and outlet of the glove box.

[0023] One end of the upper negative pressure feedback chamber D is the upper diaphragm assembly 5, and one end of the lower negative pressure feedback chamber A is the lower diaphragm assembly 4. Preferably, the upper diaphragm assembly 5 is located at the lower end of the upper negative pressure feedback chamber D, i.e., near the atmospheric chamber B; the lower diaphragm assembly 4 is located at the lower end of the lower negative pressure feedback chamber A. Furthermore, both the upper diaphragm assembly 5 and the lower diaphragm assembly 4 are preferably made of EPDM (ethylene propylene diene monomer).

[0024] In this embodiment, the valve stem 6 and the valve core 8 are preferably connected by a ball joint. The top end of the valve stem 6 is a ball joint, which is installed at the bottom of the valve core 8.

[0025] The valve stem 6 passes through the upper negative pressure feedback chamber D, the atmospheric chamber B, and the lower negative pressure feedback chamber A, and connects to the upper diaphragm assembly 5 and the lower diaphragm assembly 4. A counterweight 2 is located at the end of the valve stem 6. As shown in the figure, the top of the valve stem 6 connects to the valve core 8, and then extends downwards into the upper negative pressure feedback chamber D. In the upper negative pressure feedback chamber D, the valve stem 6 connects to the upper diaphragm assembly 5 located at the lower end, and passes through the other end of the upper negative pressure feedback chamber D. After passing through the upper negative pressure feedback chamber D, the valve stem 6 enters the atmospheric chamber B, and then enters the lower negative pressure feedback chamber A. Similarly, the valve stem 6 connects to the lower diaphragm assembly 4 located at the lower end, and passes through the other end of the lower negative pressure feedback chamber A. In other words, the valve stem 6 connects to the upper diaphragm assembly 5 and the lower diaphragm assembly 4, and passes through the others.

[0026] like Figure 1As shown, an upper bellows 10 is provided inside the valve body 7. The upper bellows 10 is fitted on the outside of the valve stem 6 and isolates the inlet and outlet air pressure. The upper bellows 10 is made of EPDM.

[0027] Similarly, a lower bellows 11 is installed in atmospheric chamber B. The lower bellows 11 is fitted on the outside of valve stem 6. The lower bellows 11 serves as a negative pressure channel and can move up and down along valve stem 6. The material of the lower bellows 11 is EPDM.

[0028] As shown in the figure, a limit switch 12 is installed on the bracket 1 to facilitate control of the valve core 8 position, and a baffle 3 is installed above the counterweight 2. The limit switch 12 provides an extreme position warning by touching the baffle 3. That is, when the valve core 8 and valve stem 6 reach their limit positions, an alarm is triggered.

[0029] To facilitate adjustment of the position of the limit switch 12, a waist-shaped hole 13 extending longitudinally is provided on the bracket 1, and the limit switch 12 is fixed by a threaded connector passing through the waist-shaped hole 13.

[0030] The principle of this invention is as follows: the inlet (N chamber) of the regulating valve is connected to the glove box, and the outlet (M chamber) is connected to the negative pressure pump. A pressure tap is provided in the glove box at the inlet and outlet far away from itself. The pressure tap is connected to the feedback chamber (upper negative pressure feedback chamber D and lower negative pressure feedback chamber A) of the regulating valve.

[0031] The pressure setting in the glove box depends on the weight of counterweight 2. When the weight of counterweight 2 reaches a certain level, since counterweight 2 is connected to valve stem 6 and valve core 8, valve core 8 disengages from valve seat 9. Air in the glove box flows through chamber N (N chamber) and valve seat 9 before entering chamber M (M chamber) and being drawn into the vacuum pump or negative pressure pipeline system. The pressure of counterweight 2 is proportional to the negative pressure in the glove box.

[0032] When a certain weight of counterweight 2 is set, the counterweight 2 drives the valve stem 6 and valve core 8 to move downward, causing the valve core 8 to disengage from the valve seat 9. The air in the glove box is drawn out through the chamber (N chamber) and the valve seat 9 to the chamber (M chamber) and then into the vacuum pump or negative pressure pipeline system. As time goes on, the absolute pressure in the glove box decreases, and the absolute pressure in the pressure tap of the glove box also decreases. Under a certain absolute negative pressure, the upper diaphragm assembly 5 and the lower diaphragm assembly 4 drive the counterweight 2, valve stem 6, and valve core 8 to move upward, causing the valve core 8 to approach the valve seat 9, so that the negative pressure value in the glove box is balanced with the force of the counterweight 2 acting on the diaphragm.

[0033] When the negative pressure inside the glove box exceeds its set negative pressure, the pressure difference generates upward pressure on the upper diaphragm assembly 5 and the lower diaphragm assembly 4 of the regulating valve, causing the valve core 8 to move upward and the valve opening to decrease. The flow rate of the medium through the regulating valve decreases, and the pressure inside the glove box rises until it eventually reaches the set negative pressure range.

[0034] When the negative pressure inside the glove box is lower than its set negative pressure, the valve core 8 moves downward under the action of the valve counterweight 2, increasing the valve opening. The flow rate of the medium through the regulating valve increases, the extraction flow rate at the glove box outlet increases, and the pressure inside the box decreases until it reaches the set negative pressure range.

[0035] The regulating valve of the present invention can achieve the following functions:

[0036] 1. The regulating valve can automatically adjust the pressure within a certain range, such as when the exhaust system capacity, ambient temperature and pressure change, or the filter is clogged, it can automatically adjust according to the glove box pressure; when the pressure reaches the upper or lower limit, an alarm signal can be provided through the limit switch on the valve bracket 1.

[0037] 2. The valve stem 6 and the valve core 8 are connected by a ball joint. This connection method has an automatic alignment function. Even if the valve stem 6 is slightly offset, the valve core 8 can still be in the position of sealing the valve seat 9.

[0038] 3. The regulating valve adopts a double diaphragm structure, which can adjust the pressure even when there is a slight change in the glove box. Compared with the single diaphragm structure, it has higher sensitivity and can generate greater thrust under the same pressure difference.

[0039] 4. By selecting non-metallic materials resistant to gamma radiation, the requirements for use in nuclear power plants are met.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A self-operated negative pressure regulating valve, characterized in that, The device includes a valve body, an upper negative pressure feedback chamber, an atmospheric chamber, a lower negative pressure feedback chamber, and a support. The valve body has an inlet and an outlet. A valve seat is provided inside the valve body between the inlet and the outlet. The valve seat can be sealed by a valve core connected to a valve stem. The upper negative pressure feedback chamber is located below the valve body, the atmospheric chamber is located below the upper negative pressure feedback chamber, and the lower negative pressure feedback chamber is located below the atmospheric chamber. The support is supported below the lower negative pressure feedback chamber. Both the upper and lower negative pressure feedback chambers have feedback ports. One end of the upper negative pressure feedback chamber is an upper diaphragm assembly, and one end of the lower negative pressure feedback chamber is a lower diaphragm assembly. The valve stem passes through the upper negative pressure feedback chamber, the atmospheric chamber, and the lower negative pressure feedback chamber and is connected to the upper and lower diaphragm assemblies. A counterweight is provided at the end of the valve stem. The valve body is provided with an upper bellows, which is fitted on the outside of the valve stem and isolates the inlet and outlet air pressure. The atmospheric chamber is equipped with a lower bellows, which is fitted onto the outside of the valve stem. The lower bellows serves as a negative pressure channel and can move up and down along the valve stem.

2. The self-operated negative pressure regulating valve according to claim 1, characterized in that, The valve stem and the valve core are connected by a ball joint.

3. The self-operated negative pressure regulating valve according to claim 1, characterized in that, The upper diaphragm assembly is located at the lower end of the upper negative pressure feedback chamber.

4. The self-operated negative pressure regulating valve according to claim 1, characterized in that, The lower diaphragm assembly is located at the lower end of the lower negative pressure feedback chamber.

5. The self-operated negative pressure regulating valve according to claim 1, characterized in that, Both the upper diaphragm assembly and the lower diaphragm assembly are made of EPDM material.

6. The self-operated negative pressure regulating valve according to claim 1, characterized in that, The bracket is equipped with a limit switch, and a baffle is provided above the counterweight. The limit switch provides an extreme position warning by touching the baffle.

7. The self-operated negative pressure regulating valve according to claim 6, characterized in that, The bracket has a waist-shaped hole extending longitudinally, and the limit switch is fixed by a threaded connector passing through the waist-shaped hole.

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