Pressure regulating valve

Abstract

The utility model relates to the technical field of liquid chromatography, in particular to a pressure regulating valve used in tests of high-pressure and ultrahigh-pressure constant flow pumps. The pressure regulating valve comprises a pressure regulating valve main body, a rotating handle and an online filter, the pressure regulating valve main body is of a three-way valve structure, an inlet channel of the pressure regulating valve main body is connected with an external sample liquid inlet valve pipe, a pressure regulating channel of the pressure regulating valve main body is movably connected with the rotating handle, and an outlet channel of the pressure regulating valve main body is fixedly connected with the online filter; an external sample liquid outlet valve pipe is fixedly connected with the online filter; and a sealing surface is arranged at the front end of the rotating handle. According to the pressure regulating valve, the backpressure regulating mode is simple and convenient, mounting is convenient, stable backpressure can be continuously provided, meanwhile, a good protection effect is achieved on a connecting part, and the reliability of an analysis result can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid chromatography technical field, concretely relates to the pressure regulating valve used in the test of high pressure and superhigh pressure constant flow pump. BACKGROUND

[0002] The superhigh efficiency chromatography system is generally a set of liquid chromatography system for testing and detecting substances under low flow and superhigh pressure conditions, wherein the high pressure constant flow pump plays a core component, which is responsible for conveying the mobile phase from the automatic sampler to the chromatographic column and the detector at a certain flow rate. The performance of the high pressure constant flow pump directly affects the efficiency, accuracy and reproducibility of chromatographic analysis. Therefore, the testing and detection of the high pressure constant flow pump is particularly important, especially in the research and development stage. An excellent pressure regulating valve can only provide normal performance feedback of the high pressure constant flow pump to the test personnel, and a pressure regulating valve can only display the high pressure constant flow pump in detail. The pressure regulating valves on the market mainly include manual adjustment and automatic adjustment.

[0003] Chinese patent document CN218992486U discloses a back pressure device, comprising a pressure regulating valve body, one end of the pressure regulating valve body is provided with an adjusting part for adjusting pressure, one end of the adjusting part is provided with a liquid inlet, the end of the adjusting part away from the liquid inlet is provided with an adjusting rod, the end of the pressure regulating valve body away from the adjusting part is provided with a liquid outlet, a liquid path pipe is arranged through the pressure regulating valve body, the liquid path pipe penetrates out of the liquid inlet and the liquid outlet at both ends respectively, the pressure regulating valve body is provided with a first limiting part and a second limiting part, and the first limiting part and the second limiting part are provided with compression assemblies. This scheme can adjust the back pressure at any time, has high pressure stabilization accuracy, and improves analysis accuracy.

[0004] Chinese patent document CN1710422A discloses an electronically controlled back pressure regulator, comprising: an analysis device having an outlet coupled to the analysis device by an outlet path; a pressure sensor coupled to the outlet path; a proportional valve coupled to the outlet path, the proportional valve configured to controllably vary pressure in the analysis device; and an electronically controlled closed loop controller configured to control flow through the outlet based on a signal from the pressure sensor and an electronically controlled pressure set point.

[0005] The back pressure device related in the above patent mainly involves the following problems:

[0006] 1. The manually adjusted back pressure device adjusts the pressure by means of a compression spring, but the spring has a certain pressure fatigue and pressure upper limit, and the pressure regulating valve of the compression spring mode is difficult to continuously provide stable back pressure.

[0007] 2. The automatic back pressure device has a complex structure, and it is inconvenient to adjust the back pressure. The electronic control back pressure device is high in cost, and is not suitable for simple test selection in a laboratory. Meanwhile, the device is provided with a circuit board for control, and there is a risk of burning the circuit due to liquid leakage during use.

[0008] 3. The back pressure devices do not consider filtering the liquid at the outlet end, and there is no protection for the connected parts. Practical new type content

[0009] Based on the problems in the prior art, the pressure regulating valve is provided to solve the problems of the current pressure regulating valve, such as lack of protection for the connected parts, inconvenient operation for adjusting the back pressure, complex installation, and inability to continuously provide stable back pressure.

[0010] To achieve the above object, the pressure regulating valve comprises a pressure regulating valve body, a rotating handle and an online filter.

[0011] The pressure regulating valve body is a three-way valve structure, and an inlet channel and a pressure regulating channel are arranged in the pressure regulating valve body in a horizontal direction. The inlet channel is fixedly connected with a sample liquid inlet valve pipe outside, and the pressure regulating channel is movably connected with the rotating handle. An outlet channel is arranged in the pressure regulating valve body in a vertical direction, and the outlet channel is fixedly connected with the online filter.

[0012] The online filter is internally provided with a filter screen plate, and a sample liquid outlet valve pipe outside is fixedly connected with the online filter.

[0013] A sealing surface is arranged at the front end of the rotating handle.

[0014] Preferably, a valve support is arranged on one side of the pressure regulating valve body.

[0015] Preferably, a plurality of supporting legs are arranged below the valve support.

[0016] Preferably, the pressure regulating valve body is connected to the valve support in a wall-penetrating mode.

[0017] Preferably, an adjusting handle is fixedly connected with the rotating handle through a handle fixing screw at the end of the rotating handle.

[0018] Preferably, the inlet channel of the pressure regulating valve body is connected with the sample liquid inlet valve pipe through a blade ring and a connecting screw.

[0019] Preferably, the online filter is connected with the sample liquid outlet valve pipe through a blade ring and a connecting screw.

[0020] Preferably, the pressure regulating channel of the pressure regulating valve body is screw-connected with the rotating handle.

[0021] Preferably, a sealing ring is arranged between the rotating handle and the inlet channel of the pressure regulating valve body.

[0022] Preferably, the sealing ring and the sealing surface are made of PEEK material.

[0023] The beneficial technical effects achieved by the utility model are:

[0024] 1. The pressure regulating valve has simple structure, simple and convenient back pressure adjusting mode and low cost. By adjusting the depth of the rotating handle in the pressure regulating valve body, the space gap between the sealing surface of the rotating handle and the outlet end of the inlet channel is changed, so that the space through which the liquid flows between the two is changed, the corresponding back pressure effect is generated, and stable back pressure can be continuously provided. Moreover, the internal channel of the pressure regulating valve is provided with a connecting structure matched with the sample liquid pipeline, so that the pressure regulating valve is simply connected and installed on the sample liquid pipeline, and the liquid can enter and exit the pressure regulating valve.

[0025] 2. The pressure regulating valve is connected with an online filter, has a certain filtering effect on the discharged liquid, effectively avoids that the flowing phase and the sample may contain small particle impurities to enter the chromatographic column and other components, causes the abrasion, blockage or damage of some components, and plays a certain protection role on the connected components. At the same time, the online filter removes the impurities, keeps the flowing phase clean, helps to maintain the stability of the system pressure, and improves the reliability of the analysis result.

[0026] In summary, the pressure regulating valve has simple and convenient back pressure adjusting mode, is easy to install, can meet the needs of various laboratories, can continuously provide stable back pressure, has a good protection effect on the connected components, and helps to improve the reliability of the analysis result. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a pressure regulating valve structure perspective view of an embodiment of the utility model;

[0028] Figure 2 It is a pressure regulating valve body and rotating handle section view of an embodiment of the utility model;

[0029] Figure 3 It is a pressure regulating valve body rear view of an embodiment of the utility model;

[0030] Figure 4 It is a pressure regulating valve body perspective view of an embodiment of the utility model;

[0031] Figure 5 It is a pressure regulating valve connecting fitting schematic view of an embodiment of the utility model;

[0032] In the drawings: 1, pressure regulating valve body; 2, rotating handle; 3, online filter; 4, valve support; 5, leg; 6, adjusting handle; 7, handle fixing screw; 8, sample liquid inlet valve pipe; 9, blade ring; 10, connecting screw; 101, inlet channel; 102, pressure regulating channel; 103, outlet channel; 201, sealing surface; 202, sealing ring; 301, filter sieve plate. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, or detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In order to better understand the purpose, structure and function of the present application, the present application will be further described in detail below in combination with the drawings.

[0038] Example 1

[0039] With reference to Figures 1 to 5 , the present embodiment provides a basic structure of a pressure regulating valve, which comprises a pressure regulating valve body 1 and a rotating handle 2, an online filter 3;

[0040] The pressure regulating valve body 1 is a three-way valve structure, and the pressure regulating valve body 1 is internally provided with an inlet channel 101 and a pressure regulating channel 102 in the horizontal direction, the inlet channel 101 is fixedly connected with the sample liquid inlet valve pipe 8 outside, and the pressure regulating channel 102 is movably connected with the rotating handle 2, the pressure regulating valve body 1 is provided with an outlet channel 103 in the vertical direction, and the outlet channel 103 is fixedly connected with the online filter 3;

[0041] The online filter 3 is internally provided with a filter screen plate 301, and the sample liquid outlet valve pipe outside is fixedly connected with the online filter 3.

[0042] The rotating handle 2 is provided with a sealing surface 201 at the front end.

[0043] Embodiment 2

[0044] With reference to Figures 1 to 5 , the embodiment provides a pressure regulating valve, which comprises a pressure regulating valve body 1 and a rotating handle 2, and an online filter 3; the pressure regulating valve body 1 is a three-way valve structure, and the pressure regulating valve body 1 is internally provided with an inlet channel 101 and a pressure regulating channel 102 in the horizontal direction, the inlet channel 101 is fixedly connected with the sample liquid inlet valve pipe 8 outside, and the pressure regulating channel 102 is movably connected with the rotating handle 2, the pressure regulating valve body 1 is provided with an outlet channel 103 in the vertical direction, and the outlet channel 103 is fixedly connected with the online filter 3; the online filter 3 is internally provided with a filter screen plate 301, and the sample liquid outlet valve pipe outside is fixedly connected with the online filter 3; and the rotating handle 2 is provided with a sealing surface 201 at the front end.

[0045] In the embodiment, as shown in Figure 2 , a sealing ring 202 is arranged between the rotating handle 2 and the inlet channel 101 of the pressure regulating valve body, the sealing ring guarantees the sealing property of the rotating handle in the pressure regulating channel, and also makes the liquid flowing through the gap between the sealing surface and the outlet end of the inlet channel flow out of the online filter under the limitation of the sealing ring.

[0046] In the embodiment, as shown in Figure 1 , one side of the pressure regulating valve body 1 is provided with a valve support 4, and four supporting legs 5 are arranged below the valve support 4. The pressure regulating valve body 1 is connected to the valve support 4 in a wall-penetrating mode, so that the pressure regulating valve body 1 is fixed on the valve support 4. The valve support is used for supporting the pressure regulating valve body and guaranteeing stable placement.

[0047] In the embodiment, as shown in Figure 1As shown in the figure, the end of the rotating handle 2 is provided with an adjusting handle 6, which is fixedly connected to the rotating handle through a handle fixing screw 7. The depth of the rotating handle in the pressure regulating valve body can be adjusted through the adjusting handle, so that the space gap between the sealing surface of the rotating handle and the outlet end of the inlet channel changes, and the liquid back pressure is realized.

[0048] In this embodiment, the pressure regulating channel of the pressure regulating valve body is threadedly connected with the rotating handle. The pressure regulating channel of the pressure regulating valve body is provided with an internal thread structure matched with the rotating handle, so as to realize the connection with the rotating handle.

[0049] In this embodiment, the connection assembly of the pressure regulating valve is shown in the schematic view as Figure 5 As shown in the figure, the inlet channel of the pressure regulating valve body is connected with the sample liquid inlet valve pipe through a blade ring and a connecting screw. The inlet channel of the pressure regulating valve body is provided with a structure matched with the blade ring and the connecting screw, so that the sample liquid inlet valve pipe 8 realizes the connection of the pipeline with the pressure regulating valve body 1 through the corresponding connecting screw 9 and the blade ring 10. Similarly, the inside of the online filter is also connected with the sample liquid outlet valve pipe through a blade ring and a connecting screw. The inside of the online filter is provided with a structure matched with the blade ring and the connecting screw, so that the sample liquid outlet valve pipe realizes the connection of the pipeline with the online filter through the corresponding connecting screw and the blade ring. Finally, the liquid flows from the inlet channel of the pressure regulating valve body to the online filter. The pressure regulating valve is installed on the sample liquid pipeline in a simple connection mode, and the liquid can be realized to enter and exit the pressure regulating valve.

[0050] In this embodiment, the sealing ring and the sealing surface can be made of PEEK material.

[0051] In this embodiment, the sample liquid inlet valve pipe, the sample liquid outlet valve pipe, the connecting screw and the blade ring are made of stainless steel material.

[0052] The pressure regulating valve of the utility model adjusts the depth of the rotating handle in the pressure regulating valve body, changes the space gap between the sealing surface of the rotating handle and the outlet end of the inlet channel, changes the space through which the liquid flows between the two, produces the corresponding back pressure effect, and realizes the simple and convenient back pressure adjusting mode and provides the continuous and stable back pressure. By connecting the online filter, the discharged liquid is filtered to a certain extent, the problem that the flowing phase and the sample may contain small particle impurities to enter the chromatographic column and cause the abrasion, blockage or damage of some components is effectively avoided, the components connected thereto are protected to a certain extent, the online filter removes the impurities and keeps the flowing phase clean, which helps to maintain the stability of the system pressure, and the reliability of the analysis result is improved.

[0053] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure regulating valve characterized by, The pressure regulating valve body, the rotating handle and the online filter are included; The pressure regulating valve body is a three-way valve structure, and an inlet channel and a pressure regulating channel are respectively arranged in the pressure regulating valve body in a horizontal direction; the inlet channel is fixedly connected with a sample liquid inlet valve pipe outside; the pressure regulating channel is movably connected with the rotating handle; an outlet channel is arranged in the pressure regulating valve body in a vertical direction; and the outlet channel is fixedly connected with the online filter; The online filter is internally provided with a filter screen plate, and a sample liquid outlet valve pipe outside is fixedly connected with the online filter; A sealing surface is arranged at the front end of the rotating handle.

2. A pressure regulating valve according to claim 1, wherein One side of the pressure regulating valve body is provided with a valve support.

3. A pressure regulating valve according to claim 2, wherein A plurality of supporting legs are arranged below the valve support.

4. A pressure regulating valve according to claim 2, wherein The pressure regulating valve body is connected to the valve support in a through-wall mode.

5. A pressure regulating valve according to claim 1, wherein An adjusting handle is fixedly connected to the end of the rotating handle through a handle fixing screw.

6. A pressure regulating valve according to claim 1, wherein The inlet channel of the pressure regulating valve body is connected with the sample liquid inlet valve pipe through a blade ring and a connecting screw.

7. A pressure regulating valve according to claim 1, wherein The inside of the online filter is connected with the sample liquid outlet valve pipe through a blade ring and a connecting screw.

8. A pressure regulating valve according to claim 1, wherein The pressure regulating channel of the pressure regulating valve body is screw-connected with the rotating handle.

9. A pressure regulating valve according to claim 1, wherein A sealing ring is arranged between the rotating handle and the inlet channel of the pressure regulating valve body.

10. The pressure regulating valve of claim 1, wherein The sealing ring and the sealing surface are made of PEEK material.

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