Precise pressure reducing valve

Abstract

The invention relates to the field of pressure reducing valves, in particular to a precise pressure reducing valve which comprises a valve body assembly and a valve deck assembly, the valve body assembly is in threaded connection with the valve deck assembly, and the valve body assembly comprises a valve seat, a first spring, a valve body, a spring seat, a valve element and a valve seat support; the valve deck assembly comprises a lubricating sleeve, a stop plate, a valve deck, a valve rod, a handle, a second spring and a diaphragm piece. The valve body is provided with an air outlet channel and an air inlet channel which are communicated in the horizontal direction and the vertical direction, and an air cavity is formed in the top. The valve seat support is in threaded connection with the valve body; the spring seat is arranged at the end, away from the air cavity, of the vertical channel of the air inlet channel. The outer layer of the valve element is sleeved with the first spring. The valve element is connected with the spring seat and the valve seat in an abutting mode through a first spring. The diaphragm piece is arranged between the valve body and the stop plate in an abutting mode. The second spring is arranged between the stop plate and the valve rod in an abutting mode. The handle is in threaded connection with the valve rod; and the lubricating sleeve is sleeved outside the diaphragm. And gas leakage is avoided, and the sealing performance of the pressure reducing valve is enhanced.

Description

Technical Field

[0001] The invention relates to the field of pressure reducing valves, and in particular to a precision pressure reducing valve. Background Art

[0002] The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure by adjusting it, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. The sealing of the valve cover is a key technology, and the pressure reducing valve has extremely high requirements for the sealing of the valve cover assembly.

[0003] In the prior art, the external leakage sealing surface of the pressure reducing valve is locked by rotating the pressure reducing valve cover, and the valve cover presses the metal diaphragm to fit the valve body sealing surface for sealing. Although grease is applied to the interface between the valve cover and the metal diaphragm, most of the grease is squeezed out after the contact surface is subjected to force during the locking process, thereby reducing the lubrication effect. It is easy for the valve cover to drive the metal diaphragm to rotate, and the metal diaphragm and the valve body sealing surface are easily rotated and displaced, causing mutual scratching, resulting in gas leakage at the external leakage sealing surface.

[0004] Therefore, it is necessary to provide a precision pressure reducing valve to solve the above technical problems. Summary of the invention

[0005] In order to overcome the problem that when the existing pressure reducing valve cover is rotated and locked, most of the grease is squeezed out, the valve cover easily drives the metal diaphragm to rotate, rotational displacement occurs between the metal diaphragm and the valve body sealing surface, and they scratch each other, causing gas leakage at the external leakage sealing surface, the present invention provides a precision pressure reducing valve.

[0006] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] A precision pressure reducing valve comprises a valve body assembly and a valve cover assembly, wherein the valve body assembly is threadedly connected to the valve cover assembly, and the valve body assembly comprises: a valve seat, a first spring, a valve body, a spring seat, a valve core and a valve seat support;

[0008] The valve cover assembly comprises: a lubricating sleeve, a stop plate, a valve cover, a valve stem, a handle, a second spring and a diaphragm;

[0009] The valve body is provided with an air outlet channel and an air inlet channel which are connected in both horizontal and vertical directions, and an air cavity which is respectively connected with the air outlet channel and the air inlet channel is provided on the top; the valve seat, the first spring, the spring seat and the valve core are all arranged in the vertical channel of the air inlet channel; the valve seat support is threadedly connected with the valve body and is arranged at one end of the vertical channel of the air inlet channel close to the air cavity; the spring seat is arranged at one end of the vertical channel of the air inlet channel away from the air cavity; the first spring is sleeved on the outer layer of the valve core; the valve core is connected with the spring seat and the valve seat by the first spring;

[0010] The diaphragm is disposed between the valve body and the stop plate; the second spring is disposed between the stop plate and the valve stem; the handle is threadedly connected to the valve stem;

[0011] The lubricating sleeve is sleeved on the outer layer of the diaphragm, has two inverted L-shaped longitudinal sections, and is radially and longitudinally abutted against the valve cover.

[0012] As a further solution of the present invention: the surface of the lubricating sleeve is silver-plated.

[0013] As a further solution of the present invention: the thickness of the silver plating on the surface of the lubricating sleeve is 4 to 6 μm.

[0014] As a further solution of the present invention: the valve core includes an upper valve core portion, a frustum portion and a lower valve core portion; the valve seat is butted and connected with the conical surface of the frustum portion.

[0015] As a further solution of the present invention: a spring button is arranged between the second spring and the valve stem.

[0016] As a further solution of the present invention: one end of the valve stem close to the second spring is in a cone shape; the spring button is in a hollow cone shape corresponding to the cone shape of the second spring, and the two are butt-connected.

[0017] As a further solution of the present invention: the valve cover assembly also includes a handle cover, and the handle cover is arranged at the center of the upper end of the handle, and the two are snap-connected.

[0018] As a further solution of the present invention: the longitudinal section of the handle is H-shaped, including a handle body, an upper hole and a lower hole, and a through hole connecting the upper hole and the lower hole.

[0019] As a further solution of the present invention: the valve cover assembly further includes a first nut and a second adjusting nut; the first nut and the second adjusting nut are both threadedly connected to the valve stem; the second adjusting nut is limited in the through hole; the first nut is arranged in the upper hole; the handle is threadedly connected to the valve stem through the second adjusting nut.

[0020] As a further solution of the present invention: the valve body assembly also includes an air outlet nozzle, an air outlet pipe, an air inlet pipe and an air inlet nozzle; the air outlet pipe and the air inlet pipe are both connected to the valve body by welding, and are respectively connected to the air outlet of the air outlet channel and the air inlet of the air inlet channel; the air outlet nozzle and the air inlet nozzle are respectively threadedly connected to the air outlet pipe and the air inlet pipe, and are respectively arranged on the outer layers of the air outlet pipe and the air inlet pipe.

[0021] Beneficial effects of a precision pressure reducing valve according to the present invention:

[0022] Since a lubricating sleeve is added between the valve cover and the diaphragm, the lubricating sleeve is pressed by rotating and locking the valve cover during assembly, and the lubricating sleeve then presses the diaphragm, and the diaphragm is pressed against the sealing surface of the valve body seat to achieve a sealing effect. The problem of the diaphragm rotating and scratching the sealing surface of the valve body seat when rotating and locking the valve cover is solved, thereby ensuring that gas does not leak and enhancing the sealing performance of the pressure reducing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded view of the precision pressure reducing valve of the present invention;

[0024] Figure 2 The present invention Figure 1 Enlarged view of part A in the middle;

[0025] Figure 3 The present invention Figure 1 Enlarged view of middle part B;

[0026] Figure 4 The present invention Figure 1 Enlarged view of middle C;

[0027] Figure 5 It is a three-dimensional diagram of the structure of the precision pressure reducing valve of the present invention;

[0028] Figure 6 This is a front view of the precision pressure reducing valve of the present invention;

[0029] Figure 7 The present invention Figure 6 Enlarged view of the middle D part;

[0030] Figure 8 It is a front view of the handle of the present invention;

[0031] Fig. 9 It is a three-dimensional diagram of the valve core structure of the present invention.

[0032] In the figure: 100-valve body assembly, 1a0-valve seat, 1b0-first spring, 1c0-air outlet nozzle, 1d0-air outlet pipe, 1e0-valve body, 1e1-air cavity, 1e2-air outlet channel, 1e3-air inlet channel, 1f0-air inlet pipe, 1g0-air inlet nozzle, 1h0-spring seat, 1i0-valve core, 1i1-upper valve core part, 1i2-cone part, 1i3-lower valve core part, 1j0-valve seat Support, 200-valve cover assembly, 2a0-lubricating sleeve, 2b0-stop plate, 2c0-valve cover, 2d0-valve stem, 2e0-first nut, 2f0-handle, 2f1-handle body, 2f2-lower hole, 2f3-through hole, 2f4-upper hole, 2g0-handle cover, 2h0-second adjusting nut, 2i0-spring button, 2j0-second spring, 2k0-sealing ring, 2m0-diaphragm. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, a precision pressure reducing valve of 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 used to limit the present invention.

[0034] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "center", "longitudinal", "lateral", "up", "down", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 the present invention can be understood by specific circumstances.

[0036] like Figures 1 to 9 As shown, a precision pressure reducing valve comprises a valve body assembly 100 and a valve cover assembly 200, wherein the valve body assembly 100 is threadedly connected with the valve cover assembly 200, and the valve body assembly 100 comprises: a tubular valve seat 1a0, a first spring 1b0, a valve body 1e0, a spring seat 1h0, a valve core 1i0 and a valve seat support 1j0; the valve core 1i0 comprises an upper valve core portion 1i1, a frustum portion 1i2 and a lower valve core portion 1i3; the valve seat 1a0 is butted against the conical surface of the frustum portion 1i2; the frustum portion 1i2 is provided to better exert the valve control function of the precision pressure increasing valve;

[0037] The valve body 1e0 is provided with an outlet channel 1e2 and an inlet channel 1e3 which are connected in both horizontal and vertical directions, and an air cavity 1e1 which is respectively connected with the outlet channel 1e2 and the inlet channel 1e3 is provided on the top; the valve seat 1a0, the first spring 1b0, the spring seat 1h0 and the valve core 1i0 are all arranged in the vertical channel of the inlet channel 1e3; the valve seat support 1j0 is threadedly connected with the valve body 1e0 and is arranged at one end of the vertical channel of the inlet channel 1e3 close to the air cavity 1e1; the spring seat 1h0 is arranged at one end of the vertical channel of the inlet channel 1e3 away from the air cavity 1e1; the first spring 1b0 is sleeved on the outer layer of the valve core 1i0; the valve core 1i0 is connected with the spring seat 1h0 and the valve seat 1a0 by the first spring 1b0;

[0038] The valve cover assembly 200 includes: a lubricating sleeve 2a0, a stop plate 2b0, a valve cover 2c0, a valve stem 2d0, a first nut 2e0, a handle 2f0, a handle cover 2g0, a second adjusting nut 2h0, a second spring 2j0, a sealing ring 2k0 and a diaphragm 2m0; the handle cover 2g0 is arranged at the center of the upper end of the handle 2f0, and the two are snap-connected; the sealing ring 2k0 is fastened to the outer layer of the stop plate 2b0, and plays a radial limiting role;

[0039] The handle 2f0 has an H-shaped longitudinal section, including a handle body 2f1, an upper hole 2f4 and a lower hole 2f2, and a through hole 2f3 connecting the upper hole 2f4 and the lower hole 2f2;

[0040] The first nut 2e0 and the second adjusting nut 2h0 are both threadedly connected to the valve stem 2d0; the second adjusting nut 2h0 is limited to the through hole 2f3; the first nut 2e0 is arranged in the upper hole 2f4; the handle 2f0 is threadedly connected to the valve stem 2d0 through the second adjusting nut 2h0;

[0041] The diaphragm 2m0 is disposed between the valve body 1e0 and the stop plate 2b0; the second spring 2j0 is disposed between the stop plate 2b0 and the valve stem 2d0; the handle 2f0 is threadedly connected to the valve stem 2d0;

[0042] The lubricating sleeve 2a0 is sleeved on the outer layer of the diaphragm 2m0, has two inverted L-shaped longitudinal sections, and is radially and longitudinally abutted against the valve cover 2c0.

[0043] During assembly, first place the valve cover 2c0 on the special fixture, then put the lubricating sleeve 2a0 into the valve cover 2c0 according to the direction requirements, then put the diaphragm 2m0 into the lubricating sleeve 2a0 according to the direction requirements, and finally rotate the valve body assembly 100 clockwise into the valve cover 2c0, and then use a torque wrench to tighten with a torque of 200N.M to complete the installation of the valve cover 2c0. After the valve cover 2c0 is installed, test it and install the remaining accessories of the valve cover assembly 200.

[0044] Since the lubricating sleeve 2a0 is added between the valve cover 2c0 and the diaphragm 2m0, the lubricating sleeve 2a0 is pressed by rotating and locking the valve cover 2c0 during assembly, and the lubricating sleeve 2a0 then presses the diaphragm 2m0, and the diaphragm 2m0 is pressed against the sealing surface of the valve body 1e0 after being subjected to force to achieve a sealing effect. The problem of the diaphragm 2m0 being driven to rotate and scratch the sealing surface of the valve body 1e0 when the valve cover 2c0 is rotated and locked is solved, thereby ensuring that the gas does not leak and enhancing the sealing performance of the pressure reducing valve.

[0045] like Figure 1 , Figure 6 , Figure 7 As shown, as a further solution of the present invention: the surface of the lubricating sleeve 2a0 is silver-plated.

[0046] The silver-plated layer has a lubricating effect and has strong adhesion. It will not be squeezed out when subjected to force and has a good lubrication effect. After the lubricating sleeve 2a0 is added to the precision pressure reducing valve, the lubricating sleeve 2a0 is rotated and locked during assembly, and the diaphragm 2m0 will not be driven to rotate. This solves the problem that during the rotation and locking process of the lubricating sleeve 2a0, due to the insufficient adhesion of traditional grease, it is easy to be squeezed out when subjected to force, reducing the lubrication effect, and at the same time, the diaphragm 2m0 is driven by the lubricating sleeve 2a0 to rotate and scratch the sealing surface of the valve body 1e0, ensuring that the gas does not leak and further enhancing the sealing of the pressure reducing valve.

[0047] like Figure 1 , Figure 6 , Figure 7 As shown, as a further solution of the present invention: the thickness of the silver plating on the surface of the lubricating sleeve 2a0 is 4μm, 5μm or 6μm. It can not only play a lubricating role and enhance the sealing performance of the pressure reducing valve, but also be economical and applicable. The sealing effect is shown in Table 1.

[0048] like Figure 1 , Figure 6 As shown, as a further solution of the present invention: a spring button 2i0 is arranged between the second spring 2j0 and the valve stem 2d0.

[0049] The provision of the spring button 2i0 is conducive to better supporting the second spring 2j0 and the valve stem 2d0.

[0050] like Figure 1 , Figure 6As shown, as a further solution of the present invention: the end of the valve stem 2d0 close to the second spring 2j0 is conical; the spring button 2i0 is a hollow conical shape, corresponding to the conical shape of the second spring 2j0, and the two are butted and connected.

[0051] Setting the contact surfaces of the spring button 2i0 and the valve stem 2d0 to be conical can better exert the abutting effect between the second spring 2j0 and the valve stem 2d0 and better control the regulating valve cover assembly 200.

[0052] like Figure 1 , Figure 5 , Figure 6 As shown, as a further solution of the present invention: the valve body assembly 100 also includes an air outlet nozzle 1c0, an air outlet pipe 1d0, an air inlet pipe 1f0 and an air inlet nozzle 1g0; the air outlet pipe 1d0 and the air inlet pipe 1f0 are respectively connected to the air outlet of the air outlet channel 1e2 and the air inlet of the air inlet channel 1e3 through welding connection with the valve body 1e0; the air outlet nozzle 1c0 and the air inlet nozzle 1g0 are respectively threadedly connected to the air outlet pipe 1d0 and the air inlet pipe 1f0, and are respectively arranged on the outer layer of the air outlet pipe 1d0 and the air inlet pipe 1f0.

[0053] The air outlet nozzle 1c0, the air outlet pipe 1d0, the air inlet pipe 1f0 and the air inlet nozzle 1g0 are arranged, and the precision pressure reducing valve can be quickly assembled, which plays the role of convenient use and improved work efficiency.

[0054] Table 1

[0055]

[0056] The invention described above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A precision pressure reducing valve, comprising a valve body assembly (100) and a valve cover assembly (200), wherein the valve body assembly (100) is threadedly connected to the valve cover assembly (200), wherein the valve body assembly (100) comprises: A valve seat (1a0), a first spring (1b0), a valve body (1e0), a spring seat (1h0), a valve core (1i0) and a valve seat support (1j0); The valve cover assembly (200) comprises: a lubricating sleeve (2a0), a stop plate (2b0), a valve cover (2c0), a valve stem (2d0), a handle (2f0), a second spring (2j0) and a diaphragm (2m0); The valve body (1e0) is provided with an air outlet channel (1e2) and an air inlet channel (1e3) which are connected in both the horizontal and vertical directions, and an air cavity (1e1) which is respectively connected to the air outlet channel (1e2) and the air inlet channel (1e3) is provided on the top; the valve seat (1a0), the first spring (1b0), the spring seat (1h0) and the valve core (1i0) are all arranged in the vertical channel of the air inlet channel (1e3); the valve seat support (1j0) and the valve body (1e0) is threadedly connected and is placed at one end of the vertical channel of the air inlet channel (1e3) close to the air cavity (1e1); the spring seat (1h0) is arranged at one end of the vertical channel of the air inlet channel (1e3) away from the air cavity (1e1); the first spring (1b0) is sleeved on the outer layer of the valve core (1i0); the valve core (1i0) is abutted and connected with the spring seat (1h0) and the valve seat (1a0) through the first spring (1b0); The diaphragm (2m0) is disposed between the valve body (1e0) and the stop plate (2b0); the second spring (2j0) is disposed between the stop plate (2b0) and the valve stem (2d0); the handle (2f0) is threadedly connected to the valve stem (2d0); The lubricating sleeve (2a0) is sleeved on the outer layer of the diaphragm (2m0), has two inverted L-shaped longitudinal sections, and is radially and longitudinally abuttingly connected to the valve cover (2c0).

2. The precision pressure reducing valve according to claim 1, characterized in that: The surface of the lubricating sleeve (2a0) is silver-plated.

3. The precision pressure reducing valve according to claim 2, characterized in that: The thickness of the silver plating on the surface of the lubricating sleeve (2a0) is 4 to 6 μm.

4. The precision pressure reducing valve according to claim 2 or 3, characterized in that: The valve core (1i0) comprises an upper valve core portion (1i1), a frustum portion (1i2) and a lower valve core portion (1i3); the valve seat (1a0) is butt-connected with the conical surface of the frustum portion (1i2).

5. The precision pressure reducing valve according to claim 4, characterized in that: A spring button (2i0) is provided between the second spring (2j0) and the valve stem (2d0).

6. The precision pressure reducing valve according to claim 5, characterized in that: One end of the valve stem (2d0) close to the second spring (2j0) is in a cone shape; the spring button (2i0) is in a hollow cone shape corresponding to the cone shape of the second spring (2j0), and the two are butt-connected.

7. The precision pressure reducing valve according to claim 6, characterized in that: The valve cover assembly (200) further comprises a handle cover (2g0), wherein the handle cover (2g0) is arranged at the center of the upper end of the handle (2f0), and the two are connected by snap-fit.

8. The precision pressure reducing valve according to claim 7, characterized in that: The handle (2f0) has an H-shaped longitudinal section, and comprises a handle body (2f1), an upper hole (2f4), a lower hole (2f2), and a through hole (2f3) connecting the upper hole (2f4), the lower hole (2f2), and the like.

9. The precision pressure reducing valve according to claim 8, characterized in that: The valve cover assembly (200) also includes a first nut (2e0) and a second adjusting nut (2h0); the first nut (2e0) and the second adjusting nut (2h0) are both threadedly connected to the valve stem (2d0); the second adjusting nut (2h0) is limited in the through hole (2f3); the first nut (2e0) is arranged in the upper hole (2f4); the handle (2f0) is threadedly connected to the valve stem (2d0) through the second adjusting nut (2h0).

10. The precision pressure reducing valve according to any one of claims 2 or 3 or 5 to 9, characterized in that: The valve body assembly (100) further comprises an air outlet nozzle (1c0), an air outlet pipe (1d0), an air inlet pipe (1f0) and an air inlet nozzle (1g0); the air outlet pipe (1d0) and the air inlet pipe (1f0) are both connected to the valve body (1e0) by welding, and are respectively connected to the air outlet of the air outlet channel (1e2) and the air inlet of the air inlet channel (1e3); the air outlet nozzle (1c0) and the air inlet nozzle (1g0) are respectively threadedly connected to the air outlet pipe (1d0) and the air inlet pipe (1f0), and are respectively arranged on the outer layers of the air outlet pipe (1d0) and the air inlet pipe (1f0).

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