Liquid mixer

Abstract

The utility model discloses a liquid mixer. The liquid mixer comprises a shell and a mixing assembly, a mixing groove is formed in the shell, the mixing assembly is arranged in the mixing groove and comprises a spring, a sieve plate connected with the spring and a rotor, the rotor is arranged at the bottom of the mixing groove, the sieve plate is slidably arranged in the mixing groove, the lower end of the spring is fixedly connected with the sieve plate, and the upper end of the spring is fixedly connected with the closed top of the mixing groove. A first cavity is defined by the sieve plate, the rotor and the side wall of the mixing tank; the sieve plate, the side wall of the mixing tank and the top of the mixing tank define a second cavity; the shell is provided with a liquid inlet communicated with the first cavity, and the shell is provided with a liquid outlet communicated with the second cavity. A sieve plate-spring structure is arranged in a mixing tank, and when a sieve plate filters impurities in sample injection liquid, a spring is compressed by utilizing pressure generated when the liquid passes through micropores in the sieve plate, so that the volume of a first cavity, namely a mixing pool, is automatically increased to automatically adapt to the flow velocity of the liquid; and a better mixing effect is achieved while manual adjustment is not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid chromatography, in particular to a liquid mixer. Background Art

[0002] In liquid-phase equipment, when two or more different reagents need to be sampled simultaneously, a mixer is typically used for mixing. Because different mixing cell volumes produce different mixing effects at different injection flow rates, there is an optimal mixing cell volume for each flow rate. The faster the liquid injection flow rate, the larger the required mixing cell volume. Existing mixers used in liquid-phase equipment require manual adjustment of the mixing cell volume, which not only has a limited adjustment range but also requires multiple manual adjustments during the experiment if different mixing cell volumes are required when performing multiple experiments consecutively. This is inconvenient and impacts the work process. Utility Model Content

[0003] Purpose of the invention: The purpose of the utility model is to provide a liquid mixer that can automatically adjust the volume of the mixing tank and filter the sample liquid.

[0004] Technical solution: A liquid mixer comprises: a shell and a mixing assembly; a mixing tank is provided in the shell, the mixing assembly is arranged in the mixing tank, the mixing assembly comprises a spring, a sieve plate connected to the spring and a rotor, the rotor is provided at the bottom of the mixing tank, the sieve plate is slidably provided in the mixing tank, the lower end of the spring is fixedly connected to the sieve plate, the upper end of the spring is fixedly connected to the closed top of the mixing tank, the sieve plate, the rotor and the side wall of the mixing tank form a first cavity; the sieve plate, the side wall of the mixing tank and the top of the mixing tank form a second cavity; the shell is provided with a liquid inlet connected to the first cavity, and the shell is provided with a liquid outlet connected to the second cavity.

[0005] Preferably, the liquid mixer further comprises a mixer cover, which is fixedly connected to the housing and has a liquid outlet connected to the liquid outlet hole.

[0006] Preferably, a baffle with holes is fixed on the top of the mixing tank, and the upper end of the spring is fixedly connected to the baffle with holes.

[0007] Preferably, a motor is further provided outside the housing, and a drive shaft of the motor extends into the housing to drive the rotor.

[0008] Further preferably, the rotor is a magnetic rotor, and a motor is provided outside the shell. The motor is connected to a magnetic rod, and the magnetic rod and the rotor are coaxially arranged on the inner and outer sides of the bottom of the shell. When the magnetic rod rotates, the rotor is driven to rotate synchronously.

[0009] Specifically, the perforated baffle, spring and screen plate are made of corrosion-resistant materials.

[0010] Preferably, the spring and the screen plate are made of titanium alloy, and the perforated baffle is made of PEEK.

[0011] Beneficial effect: Compared with the prior art, the improved effect of the present invention is as follows: the present invention sets a sieve plate-spring-baffle structure in the mixing tank, and uses the pressure generated when the liquid passes through the micropores on the sieve plate to compress the spring. Since the baffle is fixed, the spring shortens when compressed, so that the volume of the mixing tank automatically increases. Since the greater the flow rate, the greater the pressure on the sieve plate, the larger the volume of the mixing tank, thereby achieving an automatic adjustment effect in which the volume of the mixing tank increases with the increase in flow rate. At the same time, the sieve plate also filters impurities in the sampled liquid. In the sample injection test, the liquid mixer provided by the present invention has a better mixing effect than the control group that does not use an injector and uses a fixed volume injector, and does not require any manual adjustment, saving labor costs while accelerating the experimental process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view of the liquid mixer of Example 1 of the present utility model.

[0013] Figure 2 This is a cross-sectional view of the liquid mixer of Example 2 of the present utility model. DETAILED DESCRIPTION

[0014] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0015] Example 1

[0016] Please refer to Figure 1 As shown, this embodiment provides a liquid mixer, including a shell 1 and a mixing assembly; a mixing tank 11 is opened in the shell 1, and the mixing assembly is arranged in the mixing tank 11, the mixing assembly includes a spring 3, a sieve plate 4 connected to the spring 3 and a rotor 5, the rotor 5 is arranged at the bottom of the mixing tank 11, the sieve plate 4 is slidably arranged in the mixing tank 11, the lower end of the spring 3 is fixedly connected to the sieve plate 4, and the upper end of the spring 3 is fixedly connected to the closed top of the mixing tank 11, the sieve plate 4, the rotor 5 and the side wall of the mixing tank 11 form a first cavity 111, and the first cavity 111 is a mixing pool for mixing liquids; the sieve plate 4, the side wall of the mixing tank 11 and the top of the mixing tank 11 form a second cavity 112; the shell 1 is provided with a liquid inlet 12 connected to the first cavity 111, and the shell 1 is provided with a liquid outlet 13 connected to the second cavity 112. In this embodiment, the liquid mixer further comprises a mixer cover 6 , which is fixedly connected to the housing 1 . The mixer cover 6 is provided with a liquid outlet 61 communicating with the liquid outlet hole 13 . The liquid outlet 61 is used to connect to an external liquid phase device.

[0017] In this embodiment, a baffle plate 2 with holes is fixed on the top of the mixing tank 11 for closing the top of the mixing tank 11 , and the upper end of the spring 3 is fixedly connected to the baffle plate 2 with holes.

[0018] In this embodiment, the liquid mixer is further provided with a motor 8 located outside the housing 1 , and a drive shaft of the motor 8 extends into the housing 1 to drive the rotor 5 .

[0019] In this embodiment, a sealing ring 7 is provided between the mixer cover 6 and the mixing tank 11 to enhance the overall sealing effect of the liquid mixer.

[0020] The perforated baffle 2, spring 3 and sieve plate 4 are all made of corrosion-resistant materials; in this embodiment, the spring 3 and sieve plate 4 are made of titanium alloy, and the perforated baffle 2 is made of PEEK (polyetheretherketone), which can effectively prevent liquid corrosion.

[0021] In this embodiment, sieve plates 4 with different micropore diameters can be selected for setting under corresponding conditions according to actual needs. The size of the mixing tank 11 and the length of the spring 3 can also be selected according to actual needs and are not limited in this embodiment.

[0022] The working principle of this embodiment is as follows: two or more liquids to be mixed are transported to the first cavity 111 through the liquid inlet 12, and at the same time, the motor 8 is started to drive the rotor 5 to rotate to mix the liquids. After the liquids are mixed, they are filtered through the micropores on the sieve plate 4. At the same time, pressure is generated to push the sieve plate 4, causing the spring 3 to shorten and the volume of the first cavity 111 to increase, thereby realizing automatic adjustment of the volume of the mixing tank. After passing through the sieve plate 4, the mixed liquid enters the second cavity 112, and then enters the liquid outlet 61 through the liquid outlet hole 13, and finally flows into the externally connected liquid phase equipment.

[0023] Example 2

[0024] Please refer to Figure 2 As shown, this embodiment provides a liquid mixer, which is different from the liquid mixer provided in Example 1 only in that, in this embodiment, the rotor 5 is a magnetic rotor, and the liquid mixer is also provided with a motor 8 located outside the housing 1, and the motor 8 is fixedly connected to a magnetic rod 9, which is coaxial with the rotor 5 and is arranged on the inner and outer sides of the bottom of the housing 1. When the magnetic rod 9 rotates, the rotor 5 is driven to rotate synchronously.

[0025] Compared with the solution of Example 1, this embodiment provides a contactless rotor driving method, which enables the first cavity 111 to have a better sealing effect. The rest of the working principles are exactly the same as those of Example 1.

[0026] The same liquid phase equipment was used for testing, and a sieve plate 4 with a mesh diameter of 20 μm was selected. Two liquids, one pure water and the other a 0.5% acetone solution by mass, were sampled at a flow rate of 1 ml / min. Compared with sampling without a mixer and sampling with a mixer with a fixed volume of 2 ml, the liquid mixer provided in this embodiment had a better sampling effect, as manifested by a higher signal response, a faster rise rate, a faster drop at the rear end of the curve, and a smaller tail within the same time, demonstrating that the liquid mixer provided in this embodiment has a better mixing effect.

Claims

1. A liquid mixer, characterized in that: include: A housing (1) and a mixing assembly; a mixing tank (11) is provided in the housing (1); the mixing assembly is arranged in the mixing tank (11); the mixing assembly comprises a spring (3), a sieve plate (4) connected to the spring (3) and a rotor (5); the rotor (5) is arranged at the bottom of the mixing tank (11); the sieve plate (4) is slidably arranged in the mixing tank (11); the lower end of the spring (3) is fixedly connected to the sieve plate (4); the upper end of the spring (3) is fixedly connected to the closed top of the mixing tank (11); the sieve plate (4), the rotor (5) and the side wall of the mixing tank (11) form a first cavity (111); the sieve plate (4), the side wall of the mixing tank (11) and the top of the mixing tank (11) form a second cavity (112); the housing (1) is provided with a liquid inlet (12) connected to the first cavity (111); the housing (1) is provided with a liquid outlet (13) connected to the second cavity (112).

2. The liquid mixer according to claim 1, characterized in that: The liquid mixer further comprises a mixer cover (6), wherein the mixer cover (6) is fixedly connected to the housing (1), and a liquid outlet (61) communicating with the liquid outlet hole (13) is formed on the mixer cover (6).

3. The liquid mixer according to claim 2, characterized in that: A baffle plate with holes (2) is fixed on the top of the mixing tank (11), and the upper end of the spring (3) is fixedly connected to the baffle plate with holes (2).

4. The liquid mixer according to claim 1, wherein: A motor (8) is also provided outside the housing (1), and a drive shaft of the motor (8) extends into the housing (1) to drive the rotor (5).

5. The liquid mixer according to claim 1, characterized in that: The rotor (5) is a magnetic rotor and is further provided with a motor (8) located outside the housing (1). The motor (8) is connected to a magnetic bar (9). The magnetic bar (9) and the rotor (5) are coaxially arranged on the inner and outer sides of the bottom of the housing (1). When the magnetic bar (9) rotates, the rotor (5) is driven to rotate synchronously.

6. The liquid mixer according to claim 3, characterized in that: The perforated baffle (2), spring (3) and sieve plate (4) are all made of corrosion-resistant materials.

7. The liquid mixer according to claim 6, characterized in that: The spring (3) and the screen plate (4) are made of titanium alloy, and the perforated baffle (2) is made of PEEK.

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