Pressure reducing valve with non-return function

Abstract

The present invention provides a pressure reducing valve with a check function, comprising: a valve body: comprising an air inlet and an air outlet, forming a cavity inside, the air inlet and the air outlet being connected to the cavity; a valve cover: mounted on the valve body, cooperating with the valve body to form a valve body cavity, an air inlet connector: mounted at the air inlet of the valve body, the air inlet of the air inlet connector being connected to the air inlet of the valve body; a check structure: arranged at the air inlet of the air inlet connector, when the air inlet pressure is greater than the pressure inside the valve body cavity, the check structure opens, the air inlet opens, when the valve body cavity pressure is greater than the air inlet pressure, the check structure closes, the air inlet closes. The pressure reducing valve can save compressed air, while ensuring that the downstream pressure is maintained stable, and the pressure reducing valve product can be made into modular and serialized products, saving costs.

Description

Technical Field

[0001] The invention relates to the technical field of valve bodies, in particular to a pressure reducing valve with a check function. Background Art

[0002] The function of the pressure reducing valve is to adjust the higher input pressure to the specified output pressure (i.e. outlet pressure) and to keep the output pressure stable without being affected by changes in air flow and fluctuations in gas source pressure.

[0003] When the pressure reducing valve is inlet, the upstream pressure increases, and the outlet pressure is stabilized through its internal regulating structure; when the upstream pressure of the pressure reducing valve drops and is lower than the outlet pressure, the downstream gas will flow back to the inlet, affecting the stability of the outlet pressure. However, in many working conditions, the pressure at the outlet of the pressure reducing valve is often required to be stable and not affected by the fluctuation of the gas source pressure. The pressure reducing valve should have a check function to prevent the downstream gas from flowing back.

[0004] At present, the pressure reducing valve in the pneumatic device has a reflux function and cannot realize the check function alone. Many pneumatic devices or pneumatic modules realize the check function of the entire device or module by adding a separate check valve. Summary of the invention

[0005] The purpose of the present invention is to solve one of the above technical problems and provide a pressure reducing valve with a check function.

[0006] To achieve the above object, the technical solution adopted in the present invention is:

[0007] A pressure reducing valve with a check function, comprising:

[0008] Valve body: including an air inlet and an air outlet, with a cavity formed inside, and the air inlet and the air outlet are connected to the cavity;

[0009] Valve cover: installed on the valve body, and cooperates with the valve body to form the valve body cavity.

[0010] Air inlet connector: installed at the air inlet of the valve body, the air inlet of the air inlet connector is connected with the air inlet of the valve body;

[0011] Check structure: It is arranged at the air inlet of the air inlet joint. When the air inlet pressure is greater than the pressure inside the valve body cavity, the check structure opens and the air inlet opens. When the pressure in the valve body cavity is greater than the air inlet pressure, the check structure closes and the air inlet closes.

[0012] In some embodiments of the present invention, the air inlet is arranged in a horizontal direction, and the check structure includes a check valve core and a check spring, the check spring is sleeved on the check valve core, and the check valve core is arranged in close contact with the air inlet.

[0013] In some embodiments of the present invention, the air inlet is arranged along the vertical direction, and the check structure includes a check valve core, which is arranged in close contact with the air inlet.

[0014] In some embodiments of the present invention, the check structure further includes a check spring, and the check spring is sleeved on the check valve core.

[0015] In some embodiments of the present invention, the non-return structure includes an elastic sheet;

[0016] The radial width of the valve body air inlet port increases from the inside to the outside, forming a narrow diameter section and a wide diameter end;

[0017] The outer diameter of the end of the air inlet connector that is inserted into the air inlet of the valve body matches the inner diameter of the wide diameter end of the port;

[0018] The elastic sheet is arranged at the port of the step structure, and after the air inlet connector is inserted, the elastic sheet is clamped.

[0019] In some embodiments of the present invention, a valve core is disposed in the inner cavity of the valve body, including: a first valve body cavity and a second valve body cavity arranged axially, a communication port is disposed between the first valve body cavity and the second valve body cavity, and the second valve body cavity is located on a side close to the valve cover; the air inlet is communicated with the first valve body cavity, and the air outlet is communicated with the second valve body cavity;

[0020] The valve core includes a head and a stem, wherein a spring is arranged between the head and the top of the first valve body cavity, and the head can be stuck at the communication port between the first valve body cavity and the second valve body cavity to close the communication port;

[0021] The matching ends of the valve body and the valve cover form a cavity groove, in which a piston is arranged, the piston closes the radial distance of the cavity groove and can move along the cavity groove; the piston is provided with a piston hole penetrating the thickness direction thereof, the cavity groove is provided with an air hole and a rod hole, the air hole is communicated with the second valve body cavity, the rod part of the valve core passes through the rod hole and contacts with the piston;

[0022] An adjusting structure is installed in the valve cover and contacts with the piston to push the piston to move.

[0023] In some embodiments of the present invention, the adjustment structure includes:

[0024] Adjusting screw: screwed from the outside of the valve cover to the inside of the valve cover through the through hole on the valve cover;

[0025] Spring seat: in contact with the head of the adjusting screw;

[0026] First spring: arranged between the spring seat and the piston;

[0027] The second spring is arranged between the spring seat and the piston and is sleeved on the outer ring of the first spring.

[0028] In some embodiments of the present invention, an anti-wear guide sheet is provided between the outer peripheral wall of the piston and the inner wall of the cavity.

[0029] In some embodiments of the present invention, the valve cover and the valve body are connected via hexagonal screws.

[0030] In some embodiments of the present invention, an overflow port is provided on the end cover and communicated with the valve body cavity, and a waterproof breathable membrane is provided at the overflow port.

[0031] The pressure reducing valve with a check function provided by the present invention has the following beneficial effects:

[0032] 1. The pressure reducing valve has two schemes to realize the check function, which saves compressed air and ensures the stability of downstream pressure. Different check structures are provided, and the check function can be selected as needed. The pressure reducing valve products can be made into modular and serialized products to save costs.

[0033] 2. Compared with modules or devices with a single check valve, the pressure reducing valve with integrated check function is small in size, saves space and is easy to install.

[0034] 3. Add anti-wear guide plate to the piston to ensure that the piston does not tilt and avoid air leakage of the overflow pressure reducing valve.

[0035] 4. A waterproof and breathable membrane is arranged at the overflow port to play a role in waterproof, dustproof and breathable. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1a The figure is a schematic diagram of the first state structure of a pressure reducing valve according to an implementation structure.

[0038] Figure 1b It is a schematic diagram of the second state structure of a pressure reducing valve according to an implementation structure.

[0039] Figure 2 The invention is a schematic diagram of a closed check structure of a pressure reducing valve implementing a structure.

[0040] Figure 3 It is a schematic diagram of an open structure of a pressure reducing valve check structure for an implementation structure.

[0041] Figure 4a It is a schematic diagram of the first state structure of another implementation structure of the pressure reducing valve.

[0042] Figure 4bIt is a schematic diagram of the second state structure of another implementation structure pressure reducing valve.

[0043] Figure 5 It is a schematic diagram of another implementation structure of a pressure reducing valve check structure.

[0044] Figure 6 A partial enlarged view of the overflow port.

[0045] Figure 7 It is a structural diagram of the valve core and the piston.

[0046] In the above figures:

[0047] 1-valve body, 101-air inlet, 102-air outlet, 103-first valve body cavity, 104-second valve body cavity, 105-connecting port, 106-cavity groove,

[0048] 2-valve cover, 201-overflow port;

[0049] 301-head, 302-rod;

[0050] 4- Spring;

[0051] 5-Hexagonal screw;

[0052] 6-air inlet connector, 601-air inlet;

[0053] 7-piston, 701-piston hole;

[0054] 8-Adjusting screw;

[0055] 9-spring seat;

[0056] 10- first spring;

[0057] 11- second spring;

[0058] 12-check valve core;

[0059] 13- Check spring;

[0060] 14- elastic sheet;

[0061] 15- anti-wear guide plate;

[0062] 16-Waterproof breathable membrane;

[0063] 17-adhesive backing;

[0064] 18-Vulcanized rubber. DETAILED DESCRIPTION

[0065] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0066] It should be noted that when an element is referred to as being "disposed on", "connected to", another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0067] It should be understood that the terms "upper", "lower", "bottom", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first" and "second" are used for descriptive purposes only and do not imply importance.

[0068] The present invention provides a pressure reducing valve with a check function, which is different from the prior art in that a check structure is added to prevent gas from flowing back toward an air inlet during operation of the pressure reducing valve.

[0069] The pressure reducing valve with a check function is arranged based on the basic structure of the pressure reducing valve. Firstly, the basic structure of the pressure reducing valve is introduced, which includes the following parts.

[0070] Valve body 1: includes an air inlet 101 and an air outlet 102, and a cavity is formed inside. The air inlet 101 and the air outlet 102 are connected to the cavity; the positions of the air inlet 101 and the air outlet 102 are not limited and can be set at the top or side of the valve body. In this embodiment, the two air ports are respectively set on both sides of the width direction of the valve body 1.

[0071] Inlet connector 6: installed at the air inlet 101 of the valve body 1, and the air inlet 601 of the air inlet connector 6 is connected with the valve body air inlet 101. The air inlet connector 6 and the valve body 1 are plug-in structures, and a sealing structure can be set at the connection between the two to facilitate disassembly.

[0072] Valve cover 2: installed on the valve body 1, the two are connected by hexagonal screws 5, and the valve cover 2 and the valve body 1 cooperate to form a complete valve body cavity.

[0073] Furthermore, a valve core is arranged in the inner cavity of the valve body, including: a first valve body cavity 103 and a second valve body cavity 104 arranged axially, a communication port 105 is arranged between the first valve body cavity 103 and the second valve body cavity 104 (the communication port 105 is realized by a radially arranged step), and the second valve body cavity 104 is located on a side close to the valve cover 2; the air inlet 101 is communicated with the first valve body cavity 103, and the air outlet 102 is communicated with the second valve body cavity 104. In this embodiment, the first valve body cavity 103 is located at the upper part of the second valve body cavity 104.

[0074] The valve core 3 includes a head portion 301 and a rod portion 302, wherein a spring 4 is arranged between the head portion 301 and the top of the first valve body cavity 103, and the head portion 301 can be stuck at the connecting port 105 between the first valve body cavity 103 and the second valve body cavity 104. The valve core 3 can move, and when it fits with the connecting port 105, it can close the connecting port 105. At this time, the connection between the first valve body cavity 103 and the second valve body cavity 104 is closed. When it moves upward, it disengages from the connecting port 105, and the first valve body cavity 103 and the second valve body cavity 104 are connected.

[0075] The matching ends of the valve body 1 and the valve cover 2 form a cavity 106, in which a piston 7 is arranged. The piston 7 closes the radial distance of the cavity 106 and can move along the cavity 106; the piston 7 is provided with a piston hole 701 that runs through its thickness direction, and the cavity 106 is provided with an air hole 107 and a rod hole. The air hole 107 is connected with the second valve body cavity 104, and the rod 102 of the valve core 3 passes through the rod hole and contacts the piston 7. The vulcanized rubber 18 is arranged at the connecting position of the two for contact sealing. When the piston contacts the top of the cavity 106, the rod 302 of the valve core is pushed up to close the air hole 107; when the rod 302 of the valve core moves downward, the piston 7 is pressed down, and the air hole 107 is opened.

[0076] An adjusting structure is installed in the valve cover 2 and contacts with the piston 7 to push the piston 7 to move.

[0077] In some embodiments of the present invention, the adjustment structure includes:

[0078] Adjusting screw 8: through the through hole on the valve cover, screwed from the outside of the valve cover 2 to the inside of the valve cover 2, and can move relatively inward and outward of the valve cover 2;

[0079] Spring seat 9: in contact with the head of the adjusting screw 8;

[0080] First spring 10: arranged between spring seat 9 and piston 7;

[0081] The second spring 11 is arranged between the spring seat 9 and the piston 7 and is sleeved on the outer ring of the first spring 10 .

[0082] When the adjusting screw 8 moves upward, the spring seat 9 is pressed upward, the first spring 10 and the second spring 11 are compressed, and the piston 7 is driven to move upward, so as to close the air hole 107. When the adjusting screw 8 moves downward, the effect is opposite.

[0083] The working principle of the pressure reducing valve is as follows.

[0084] After the output pressure of the pressure reducing valve is set, the adjusting screw 8 presses the first spring 10 and the second spring 11 upward, driving the piston 7 and the valve core 3 to move upward, the valve port c is opened, and the upstream gas enters from the inlet of the pressure reducing valve and directly enters the second valve body cavity 104. As the gas gradually flows in, the pressure in the second valve body cavity 104 increases, and flows to the top of the piston 7 through the hole f. The gas presses the piston 7 downward, and the first spring 10 and the second spring 11 are compressed. At the same time, the valve core gradually becomes smaller under the action of the reset spring 4. When the pressure of the second valve body cavity 104 above the piston is equal to the spring force of the first spring 10 and the second spring 11, the valve port c formed at the first cavity is closed, the air inlet and the air outlet are isolated, and the outlet pressure is stable. At this time, the pressure reducing valve outputs the set pressure value, and each component is in a balanced state. When the upstream pressure of the pressure reducing valve drops and is lower than the outlet pressure, the downstream gas can flow back to the air inlet of the pressure reducing valve through the two holes b and a.

[0085] The overflow function of the pressure reducing valve depends on whether there are holes on the upper and lower sides of the piston to discharge the gas at the outlet of the pressure reducing valve into the atmosphere. When the output pressure of the overflow pressure reducing valve is stable, the valve head at the bottom of the valve core and the vulcanized rubber on the piston 7 are in contact and sealed. Figure 7 The hole in the vulcanized rubber of the piston 7 is connected to the overflow hole 201. When the pressure in the second valve body cavity 104 is higher than the pressure regulating spring force, the gas pressure pushes the piston 7 downward to discharge the excess pressure in the cavity, thus realizing the overflow function of the pressure reducing valve.

[0086] In order to solve the problem of gas backflow, the present invention designs a non-return structure.

[0087] The check structure is arranged at the air inlet 601 of the air inlet connector 6. When the pressure at the air inlet 601 is greater than the pressure inside the valve body cavity, the check structure opens and the air inlet 601 opens. When the pressure in the valve body cavity is greater than the pressure at the air inlet 601, the check structure closes and the air inlet 601 closes.

[0088] The first implementation structure of the non-return structure is as follows, refer to Figure 4a , Figure 4b and Figure 5 .

[0089] In some embodiments of the present invention, the air inlet 101 of the valve body is arranged in the horizontal direction, the check structure includes a check valve core 12 and a check spring 13, the check spring 13 is sleeved on the check valve core 12, and the check valve core 2 is arranged in close contact with the air inlet 101. Figure 4aThe figure shows the closed state of the air inlet 601 of the air inlet connector. Figure 4b The figure shows the air inlet 601 of the air inlet connector in an open state.

[0090] In some embodiments of the present invention, the air inlet of the valve body is arranged in the vertical direction, and the check structure can choose to only set the check valve core 12, and the check valve core 12 is set in close contact with the air inlet, or it can choose to set: the check valve core 12 and the check spring 13, and the check spring 13 is mounted on the check valve core 12.

[0091] Principle description: The pressure reducing valve of the present invention integrates the function of a check valve. A check spring 13 with low stiffness and a check valve core 12 are arranged at the air inlet joint 6 of the pressure reducing valve. There is vulcanized rubber on the check valve core 12, which can be sealed with the joint under the action of the check spring 13. When air is supplied, the external pressure enters the joint, and the gas pressure is generally much greater than the spring force. The check valve core 12 opens and enters the inside of the valve body, and the gas pressure in the valve body gradually increases. When the pressure in the upstream pressure inlet of the pressure reducing valve drops, the elastic force of the check spring 13 acts on the check valve core 12, and the vulcanized rubber on the check valve core 12 and the air inlet joint realize a check seal, isolating the gas upstream of the pressure reducing valve and the gas in the valve body, blocking the gas in the valve body from flowing back to the upstream, and ensuring that the gas pressure in the valve body remains unchanged. At the same time, the balance of forces on the valve core 3 in the valve body is not changed, thereby maintaining the outlet pressure unchanged. The check scheme is not limited to the structure shown in the figure, and any structure that can achieve the check function can be used. For example, when the air inlet of the pressure reducing valve is vertically downward, a structure without a check spring can be used, and only the check valve core is retained, and the sealing is achieved by relying on the weight of the check valve core itself.

[0092] The second implementation structure of the non-return structure is as follows, refer to Figures 1a to 3 .

[0093] In some embodiments of the present invention, the non-return structure includes an elastic sheet 14;

[0094] The radial width of the valve body air inlet 101 increases from the inside to the outside, forming a narrow diameter section and a wide diameter end;

[0095] The outer diameter of the end of the air inlet connector 6 inserted into the air inlet port 101 of the valve body matches the inner diameter of the wide diameter end of the port;

[0096] The elastic sheet 14 is arranged at the end of the step structure, and after the air inlet connector 6 is inserted, the elastic sheet 14 is clamped.

[0097] Whether the pressure reducing valve needs a check function can be achieved by disassembling the check rubber, which is convenient for making serialized products and saves costs. The pressure reducing valve of this scheme has an integrated check function, and an elastic sheet 14 with good resilience is arranged at the air inlet joint 6 of the pressure reducing valve. When air is taken in by the air inlet, the elastic sheet 14 bends to the left and separates from the valve port, and the air inlet channel is opened. When the pressure on the left and right sides of the elastic sheet 14 is the same, the rubber returns to its original state and the valve port is closed. If the intake pressure decreases, the elastic sheet 14 is always sealed with the valve port to prevent the gas in the valve from flowing back, thereby ensuring the stability of the output pressure of the pressure reducing valve. The elastic sheet 14 can be made of rubber with good resilience. Figure 1a The figure shows the closed state of the air inlet 601 of the air inlet connector. Figure 1b The figure shows the air inlet 601 of the air inlet connector in an open state.

[0098] The valve cover 2 is provided with an overflow hole 201, which is connected to the valve body cavity. During use, the pressure relief valve with an overflow function is also prone to leakage from the overflow hole 201. When the pressure relief valve is frequently operated, the piston is prone to tilt, resulting in a loose seal between the vulcanized rubber on the piston and the spherical surface of the valve head, and the air in the chamber flows out from the piston hole and is discharged through the overflow hole 201, thereby causing a leakage fault. In some embodiments of the present invention, an anti-wear guide sheet 15 is provided between the outer peripheral wall of the piston and the inner wall of the cavity. The anti-wear guide sheet 15 is installed in the groove of the outer peripheral wall of the piston 7. When the piston 7 moves up and down, the piston 7 moves vertically and does not tilt, thereby ensuring that the valve core 3 and the piston 7 maintain vertical sealing contact, and preventing the overflow pressure relief valve chamber gas from being discharged from the middle vent hole of the piston. In addition to using the anti-wear guide sheet 15, the piston 7 guide scheme can also use other forms of guide structures, such as directly increasing the thickness of the piston 7 and relying on the metal gap to achieve guidance.

[0099] The overflow port is exposed to the air, and water and dust can easily enter the valve body through the overflow port. Therefore, the protection of the overflow hole 201 is also very important. Figure 6 In order to solve this problem, the present invention sets a waterproof and breathable membrane at the overflow hole 201. The waterproof and breathable membrane 16 is installed at the overflow hole 201 through the adhesive 17, which plays a role of waterproof, dustproof and breathable. The protection level reaches IP67, and the adhesive material is coated, which meets environmental protection requirements and is easy to install and operate.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure reducing valve with a check function, characterized in that: include: Valve body: including an air inlet and an air outlet, with a cavity formed inside, and the air inlet and the air outlet are connected to the cavity; Valve cover: installed on the valve body, and cooperates with the valve body to form the valve body cavity. Air inlet connector: installed at the air inlet of the valve body, the air inlet of the air inlet connector is connected with the air inlet of the valve body; Check structure: It is arranged at the air inlet of the air inlet joint. When the air inlet pressure is greater than the pressure inside the valve body cavity, the check structure opens and the air inlet opens. When the pressure inside the valve body cavity is greater than the air inlet pressure, the check structure closes and the air inlet closes. The non-return structure includes an elastic sheet; The radial width of the valve body air inlet port increases from the inside to the outside, forming a narrow diameter section and a wide diameter end; The outer diameter of one end of the air inlet connector inserted into the air inlet of the valve body matches the inner diameter of the wide diameter end of the port; the elastic sheet is arranged at the port of the step structure, and after the air inlet connector is inserted, the elastic sheet is clamped.

2. The pressure reducing valve with a check function according to claim 1, characterized in that: The air inlet is arranged along the vertical direction, and the check structure includes a check valve core, which is arranged in close contact with the air inlet.

3. The pressure reducing valve with a check function according to claim 1, characterized in that: A valve core is arranged in the inner cavity of the valve body, including: a first valve body cavity and a second valve body cavity arranged axially, a communication port is arranged between the first valve body cavity and the second valve body cavity, and the second valve body cavity is located on a side close to the valve cover; the air inlet is communicated with the first valve body cavity, and the air outlet is communicated with the second valve body cavity; The valve core includes a head and a stem, wherein a spring is arranged between the head and the top of the first valve body cavity, and the head can be stuck at the communication port between the first valve body cavity and the second valve body cavity to close the communication port; The matching ends of the valve body and the valve cover form a cavity groove, in which a piston is arranged, the piston closes the radial distance of the cavity groove and can move along the cavity groove; the piston is provided with a piston hole penetrating the thickness direction thereof, the cavity groove is provided with an air hole and a rod hole, the air hole is communicated with the second valve body cavity, the rod part of the valve core passes through the rod hole and contacts with the piston; An adjusting structure is installed in the valve cover and contacts with the piston to push the piston to move.

4. The pressure reducing valve with a check function according to claim 3, characterized in that: The adjustment structure includes: Adjusting screw: screwed from the outside of the valve cover to the inside of the valve cover through the through hole on the valve cover; Spring seat: in contact with the head of the adjusting screw; First spring: arranged between the spring seat and the piston; The second spring is arranged between the spring seat and the piston and is sleeved on the outer ring of the first spring.

5. The pressure reducing valve with a check function according to claim 3, characterized in that: An anti-wear guide sheet is arranged between the outer peripheral wall of the piston and the inner wall of the cavity.

6. The pressure reducing valve with a check function according to claim 1, characterized in that: The valve cover is connected to the valve body via hexagonal screws.

7. The pressure reducing valve with a check function according to claim 1, characterized in that: The valve cover is provided with an overflow port which is communicated with the valve body cavity, and a waterproof and breathable membrane is provided at the overflow port.

Images