Throttle valve and water purification equipment

Abstract

The utility model discloses a throttle valve and water purification equipment, and belongs to the technical field of throttle valve devices. At least two stages of flow limiting holes are formed in the throttling valve, and the water passing area of the adjacent second-stage flow limiting hole in the at least two stages of flow limiting holes is larger than that of the first-stage flow limiting hole. The water passing area of the first-stage flow limiting hole closest to the liquid inlet hole is set to be minimum, the water passing area of the flow limiting holes is increased step by step subsequently, the pressure difference between the front portions and the rear portions of the flow limiting holes is reduced, the flow speed of jet water flow is reduced after liquid enters the throttling valve through the liquid inlet hole, noise of the throttling valve is effectively reduced, and the use experience feeling of a user is improved. For example, the pressure difference before and after the second-stage flow limiting hole is smaller than the pressure difference before and after the first-stage flow limiting hole.

Description

Technical Field

[0001] This application relates to the field of throttle valve devices, and in particular to a throttle valve and a water purification device. Background Technology

[0002] In liquid handling equipment (such as water purification equipment), throttle valves are important components that regulate the flow rate of liquids and control their movement.

[0003] Throttling valves typically have an inlet and an outlet, as well as throttling orifices distributed between the inlet and outlet. When water flows through the throttling orifice, the pressure difference before and after the orifice is too large, causing the water flow to be too fast and easily generating a lot of noise. Utility Model Content

[0004] This application provides a throttling valve and a water purification device. It solves the problem of excessive noise during the flow diversion process in existing throttling valves. The technical solution is as follows:

[0005] On the one hand, a throttle valve is provided, the throttle valve having an inlet port, at least two stages of flow limiting ports and an outlet port arranged sequentially;

[0006] The water passage area of ​​the second-level flow limiting hole arranged adjacent to each other in the at least two-level limiting holes is greater than that of the first-level flow limiting hole. In the channel along the flow channel of the liquid guided by the throttle valve, the second-level flow limiting hole is closer to the liquid outlet hole than the first-level flow limiting hole, and the water passage area of ​​the first-level flow limiting hole closest to the liquid inlet hole is the smallest.

[0007] The liquid enters the throttle valve through the inlet hole, and flows out through the outlet hole after passing through the at least two flow-limiting holes.

[0008] Optionally, the throttle valve includes: a throttle valve body, a first plug and a second plug, wherein the first plug and the second plug are respectively installed at both ends of the throttle valve body along the axial direction of the throttle valve body; the throttle valve body has a flow guide located between the first plug and the second plug;

[0009] The flow guide has a primary flow limiting hole and a secondary flow limiting hole arranged along the axial direction of the throttle valve body, and the water passage area of ​​the secondary flow limiting hole is larger than that of the primary flow limiting hole; the liquid inlet hole, the first plug and the flow guide form a water inlet cavity, and the liquid outlet hole, the second plug and the flow guide form a water outlet cavity.

[0010] Optionally, the throttle valve body includes: a throttle valve housing and the flow guide, wherein the flow guide is fixed within the cavity of the throttle valve housing;

[0011] The first plug is sealed to one end of the throttle valve housing, and the second plug is sealed to the other end of the throttle valve housing; the inlet and outlet holes are both distributed on the side of the throttle valve housing and communicate with the cavity of the throttle valve housing.

[0012] Optionally, the flow guide includes a support and a flow restrictor. The support is fixedly connected to the inner wall of the throttle valve housing. The support has a first flow guide cavity, and openings at both ends of the first flow guide cavity and the secondary flow restrictor. At least a portion of the flow restrictor is installed in the first flow guide cavity through the opening, and the end of the portion of the flow restrictor located in the first flow guide cavity has a first cavity between it and the secondary flow restrictor.

[0013] The flow restrictor has a second flow guiding cavity, a first opening and a primary flow restricting orifice distributed at both ends of the second flow guiding cavity, and the primary flow restricting orifice is located between the first opening and the secondary flow restricting orifice.

[0014] Optionally, the flow restrictor is detachably connected to the first flow guide cavity of the support at the opening.

[0015] Optionally, the support includes an annular connecting portion and a sleeve, wherein the annular connecting portion is fixedly connected to the inner wall of the throttle valve housing and the outer circumferential surface of the sleeve, and the target portion in the sleeve is distributed on the side of the annular connecting portion facing the second plug; the side of the second plug facing the support has an annular sleeve distributed between the outer circumferential surface of the target portion and the inner wall of the throttle valve housing;

[0016] The inner wall of the annular sleeve and the edge of the target portion form a three-level flow-limiting hole; the outer wall of the annular sleeve and the opening edge of the liquid outlet hole form a four-level flow-limiting hole. The water passage area of ​​the four-level flow-limiting hole is larger than that of the three-level flow-limiting hole, and the water passage area of ​​the three-level flow-limiting hole is larger than that of the two-level flow-limiting hole.

[0017] Optionally, the support member includes: an annular connecting portion and a sleeve, wherein the annular connecting portion is fixedly connected to the inner sidewall of the throttle valve housing and the outer circumferential side of the sleeve, and the target portion in the sleeve is distributed on the side of the annular connecting portion facing the second plug; the side of the second plug facing the support member has a plurality of annular sleeves distributed between the circumferential side of the target portion and the inner sidewall of the throttle valve housing, the plurality of annular sleeves being arranged sequentially along the radial direction of the sleeve; the support member further includes: a plurality of auxiliary sleeves fixedly connected to the side of the annular connecting portion facing the second plug, the plurality of auxiliary sleeves being arranged sequentially along the radial direction of the sleeve;

[0018] The sleeve and multiple auxiliary sleeves are arranged in a crisscross pattern with the multiple annular sleeves. A flow-limiting hole is formed between every two adjacent auxiliary sleeves and annular sleeves, and the water-passing area of ​​the multiple flow-limiting holes increases sequentially along the channel for guiding the liquid.

[0019] Optionally, when there is only one annular sleeve, a second cavity is formed between the annular sleeve and the sleeve to circumferentially enclose the first cavity; a third cavity is formed between the annular sleeve and the inner wall of the throttle valve housing to circumferentially enclose the second cavity.

[0020] Optionally, when there are multiple annular sleeves, a fourth cavity is formed between adjacent annular sleeves and the sleeve, circumferentially enclosing the first cavity, and a fifth cavity is formed between adjacent auxiliary sleeves and annular sleeves.

[0021] On the other hand, a water purification device is provided, the water purification device including any of the above-described throttling valves.

[0022] The beneficial effects of the technical solutions provided in this application include at least the following:

[0023] By incorporating at least two stages of flow-limiting orifices in the throttle valve, where the water-passing area of ​​adjacent second-stage orifices is greater than that of the first-stage orifice, the flow-passing area of ​​the first-stage orifice closest to the inlet is minimized. Subsequent orifices progressively increase their water-passing area, reducing the pressure difference before and after each orifice. This decreases the flow velocity of the jetting water after entering the throttle valve from the inlet, effectively reducing noise and improving the user experience. For example, the pressure difference before and after the second-stage orifice is less than that before and after the first-stage orifice. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of a throttle valve provided in an embodiment of this application;

[0026] Figure 2 This is an exploded cross-sectional view of a throttle valve provided in an embodiment of this application;

[0027] Figure 3 yes Figure 2 The diagram shows the assembly of the throttle valve;

[0028] Figure 4This is an exploded schematic diagram of a throttle valve provided in an embodiment of this application;

[0029] Figure 5 This is a cross-sectional view of another throttle valve provided in the embodiments of this application.

[0030] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0034] Please refer to Figure 1 , Figure 1 This is a cross-sectional view of a throttle valve provided in an embodiment of this application. The throttle valve 000 may have an inlet port Q1, at least two stages of flow-limiting orifices, and an outlet port Q2 arranged sequentially.

[0035] In the throttle valve 000, the water-passing area of ​​the second-stage flow-limiting orifice Z2, which is adjacent to the first-stage flow-limiting orifice, can be greater than that of the first-stage flow-limiting orifice Z1. Along the liquid flow channel of the throttle valve, the second-stage flow-limiting orifice Z2 is closer to the outlet orifice Q2 than the first-stage flow-limiting orifice Z1, and the first-stage flow-limiting orifice Z1, which is closest to the inlet orifice Q1, has the smallest water-passing area. It should be noted that the water-passing area of ​​each stage of flow-limiting orifice here usually refers to the minimum water-passing area of ​​that stage of flow-limiting orifice as an outlet orifice, and this water-passing area is the sum of the water-passing areas of all the flow-limiting orifices in that stage.

[0036] The liquid can enter the throttle valve through the inlet hole Q1, and after passing through at least two flow-limiting holes, it can flow out through the outlet hole Q2 of the throttle valve.

[0037] For example, the throttle valve 000 may have four levels of flow-limiting orifices distributed along the channel through which the liquid flows. These four levels of flow-limiting orifices may be a primary flow-limiting orifice K1, a secondary flow-limiting orifice K2, a tertiary flow-limiting orifice K3, and a quaternary flow-limiting orifice K4. For adjacent primary flow-limiting orifices K1 and K2, where K2 serves as the second-level flow-limiting orifice Z2 and K1 serves as the first-level flow-limiting orifice Z1, the water-passing area of ​​the secondary flow-limiting orifice K2 is greater than that of the primary flow-limiting orifice K1. Similarly, for adjacent secondary flow-limiting orifices K2 and K3, where K3 serves as the second-level flow-limiting orifice Z2 and K2 serves as the first-level flow-limiting orifice Z1, the water-passing area of ​​the tertiary flow-limiting orifice K3 is greater than that of the secondary flow-limiting orifice K2. For the adjacent fourth-level flow restrictor K4 and third-level flow restrictor K3, the fourth-level flow restrictor K4 serves as the second-level flow restrictor Z2, and the third-level flow restrictor K3 serves as the first-level flow restrictor Z1. Therefore, the water flow area of ​​the fourth-level flow restrictor K4 is greater than that of the third-level flow restrictor K3.

[0038] In this embodiment, at least two stages of flow-limiting orifices are provided in the throttle valve 000, and the water-passing area of ​​the adjacent second-stage flow-limiting orifice Z2 is greater than that of the first-stage flow-limiting orifice Z1. That is, the first-stage flow-limiting orifice Z1, closest to the inlet hole Q1, has the smallest water-passing area, and the water-passing area of ​​subsequent orifices is gradually increased. This reduces the pressure difference before and after the orifice, causing the liquid to enter the throttle valve 000 through the inlet hole Q1 and reducing the velocity of the jet water flow, effectively reducing the noise of the throttle valve and improving the user experience. For example, the pressure difference before and after the second-stage flow-limiting orifice Z2 is less than the pressure difference before and after the first-stage flow-limiting orifice Z1.

[0039] In summary, this application provides a throttle valve that incorporates at least two stages of flow-limiting orifices, where the water-passing area of ​​adjacent second-stage orifices is greater than that of the first-stage orifice. Specifically, the first-stage orifice closest to the inlet has the smallest water-passing area, and subsequent orifices progressively increase in water-passing area, reducing the pressure difference before and after each orifice. This reduces the velocity of the jetting water after the liquid enters the throttle valve through the inlet, effectively lowering the noise of the throttle valve and improving the user experience. For example, the pressure difference before and after the second-stage orifice is less than that before and after the first-stage orifice.

[0040] Optional, please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded cross-sectional view of a throttle valve provided in an embodiment of this application. Figure 3 yes Figure 2The diagram shows an assembly of a throttle valve. The throttle valve 000 may include: a throttle valve body 100, a first plug 200, and a second plug 300. The first plug 200 and the second plug 300 may be installed at opposite ends of the throttle valve body 100 along its axis. The throttle valve body 100 may have a guide member 101 located between the first plug 200 and the second plug 300. The guide member 101 may have a primary flow-limiting orifice L1 and a secondary flow-limiting orifice L2 arranged axially along the throttle valve body 100. The water-passing area of ​​the secondary flow-limiting orifice L2 may be larger than that of the primary flow-limiting orifice L1. The inlet orifice Q1, the first plug 200, and the guide member 101 may form an inlet chamber, and the outlet orifice Q2, the second plug 300, and the guide member 101 may form an outlet chamber. Here, the number of flow limiting orifices in the primary flow limiting orifice L1 can be one or more, and the number of flow limiting orifices in the secondary flow limiting orifice L2 can be one or more.

[0041] For example, after the liquid enters the water inlet chamber through the inlet hole Q1, it first passes through the primary flow-limiting hole L1 in the guide member 101, flows out of the primary flow-limiting hole L1 and then flows to the secondary flow-limiting hole L2, and finally enters the water outlet chamber and flows out through the outlet hole Q2. In this way, the pressure difference before and after the flow-limiting holes L1 and L2 is gradually reduced, and the flow velocity of the jet water is reduced after the liquid enters the throttle valve 000 through the inlet hole Q1, effectively reducing noise.

[0042] In the embodiments of this application, such as Figure 2 and Figure 3 As shown, the throttle valve body 100 may include a throttle valve housing 102 and a flow guide 101, which can be fixed within the cavity of the throttle valve housing 102. A first plug 200 can be sealed to one end of the throttle valve housing 102, and a second plug 300 can be sealed to the other end of the throttle valve housing 102. Both the inlet port Q1 and the outlet port Q2 can be located on the side of the throttle valve housing 102 and communicate with its cavity. For example, the first plug 200 can be sealed to one end of the throttle valve housing 102 via a sealing ring M, and the second plug 300 can be sealed to the other end of the throttle valve housing 102 via a sealing ring M.

[0043] For example, such as Figure 2 and Figure 3As shown, the flow guide 101 may include a support 101a and a flow restrictor 101b. The support 101a can be fixedly connected to the inner wall of the throttle valve housing 102. The support 101a may have a first flow guide cavity Q3, and openings a1 and secondary flow restricting holes L2 located at both ends of the first flow guide cavity Q3. At least a portion of the flow restrictor 101b can be installed in the first flow guide cavity Q3 by the openings a1 of the support 101a, and a first cavity Q31 can be formed between the end of the portion of the flow restrictor 101b located in the first flow guide cavity Q3 and the secondary flow restricting hole L2 of the support 101a. The flow restrictor 101b may have a second flow guide cavity Q4, and a first opening b1 and a primary flow restricting hole L1 distributed at both ends of the second flow guide cavity Q4. The first opening b1 is disposed towards the first plug 200 and communicates with the liquid inlet Q1, and the primary flow restricting hole L1 can be located between the first opening b1 and the secondary flow restricting hole L2. In this configuration, by providing a support member 101a with a first flow guiding cavity Q3 in the flow guide member 101, the flow restrictor 101b can be installed within the first flow guiding cavity Q3 through the opening a1 of the support member 101a, thus achieving integrated installation of the support member 101a and the flow restrictor 101b. Furthermore, by ensuring that the pressure difference between the outlet cavity and the first cavity Q31 is less than the pressure difference between the first cavity Q31 and the inlet cavity, the flow velocity of the jet water is reduced, effectively lowering noise.

[0044] The shape of each flow-limiting orifice in the first-level flow-limiting orifice L1 can be circular, square, or polygonal, etc.; the shape of each flow-limiting orifice in the second-level flow-limiting orifice L2 can be circular, square, or polygonal, etc.

[0045] Please refer to the following in this application: Figure 4 , Figure 4 This is an exploded view of a throttle valve provided in an embodiment of this application. The flow-limiting plug 101b can be detachably connected to the first flow-guiding cavity Q3 of the support member 101a at the opening a1 of the support member 101a. In this case, by providing a detachable connection between the flow-limiting plug 101b and the support member 101a, the flow-limiting plug 101b is easily replaceable and suitable for throttle valves 000 with different flow rate specifications. For example, the flow-limiting plug 101b can be connected to the first flow-guiding cavity Q3 of the support member 101a by a snap-fit ​​connection.

[0046] It should be noted that, in other possible implementations, the support 101a and the flow restrictor 101b can be an integral structure.

[0047] Optional, such as Figure 3As shown, in one feasible embodiment, the support member 101a may include an annular connecting portion A1 and a sleeve A2. The annular connecting portion A1 can be fixedly connected to the inner sidewall of the throttle valve housing 102 and the outer circumferential side of the sleeve A2, respectively. The target portion in the sleeve A2 can be distributed on the side of the annular connecting portion A1 facing the second plug 300, and the first cavity Q31 is distributed inside the sleeve A2. The side of the second plug 300 facing the support member 101a may have an annular sleeve 301 between the outer circumferential side of the target portion distributed in the sleeve A2 and the inner sidewall of the throttle valve housing 102.

[0048] The inner wall of the annular sleeve 301 and the edge of the target portion of the sleeve A2 can form a three-stage flow-limiting orifice L3, and the outer part of the annular sleeve 301 and the opening edge of the liquid outlet Q2 can form a four-stage flow-limiting orifice L4. The water-passing area of ​​the four-stage flow-limiting orifice L4 can be larger than that of the three-stage flow-limiting orifice L3, and the water-passing area of ​​the three-stage flow-limiting orifice L3 is larger than that of the two-stage flow-limiting orifice L2. For example, the shape of the three-stage flow-limiting orifice L3 can be annular, and the shape of the four-stage flow-limiting orifice L4 can be annular.

[0049] In this configuration, an annular sleeve 301 is provided on the side of the second plug 300 facing the support 101a, and the annular sleeve 301 is fitted onto the outer side of the target portion in the sleeve A2. Thus, the inner wall of the annular sleeve 301 and the edge of the target portion end in the sleeve A2 form an annular three-stage flow-limiting orifice L3, and the outer wall of the annular sleeve 301 and the opening edge of the liquid outlet Q2 form an annular four-stage flow-limiting orifice L4. The water-passing area of ​​the four-stage flow-limiting orifice L4 is larger than that of the three-stage flow-limiting orifice L3, and the water-passing area of ​​the three-stage flow-limiting orifice L3 is larger than that of the two-stage flow-limiting orifice L2. This further reduces the flow velocity of the jet water and effectively reduces the noise of the throttle valve.

[0050] In another feasible approach, please refer to Figure 5 , Figure 5This is a cross-sectional view of another throttle valve provided in this application embodiment. The support member 101a may include an annular connecting portion A1 and a sleeve A2. The annular connecting portion A1 can be fixedly connected to the inner wall of the throttle valve housing 102 and the outer circumferential surface of the sleeve A2, respectively. The target portion in the sleeve A2 can be distributed on the side of the annular connecting portion A1 facing the second plug 300. The side of the second plug 300 facing the support member 101a may have multiple annular sleeves 301 distributed between the circumferential surface of the target portion in the sleeve A2 and the inner wall of the throttle valve housing 102. The multiple annular sleeves 301 can be arranged sequentially along the radial direction of the sleeve A2. The support member 101a further includes multiple auxiliary sleeves A3 fixedly connected to the side of the annular connecting portion A1 facing the second plug 300. The multiple auxiliary sleeves A3 can be arranged sequentially along the radial direction of the sleeve A2. Here, multiple auxiliary sleeves A3 are sequentially connected, and the auxiliary sleeve A3 closest to sleeve A2 is fitted on the outer side of sleeve A2.

[0051] Among them, sleeve A2 and multiple auxiliary sleeves A3 can be arranged alternately with multiple annular sleeves 301. An annular auxiliary flow-limiting hole L5 is formed between every two adjacent auxiliary sleeves A3 and annular sleeves 301, and the water passage area of ​​the multiple auxiliary flow-limiting holes L5 increases sequentially along the channel for guiding the liquid. Here, the inner sidewall of the annular sleeve 301 closest to sleeve A2 and the edge of the target part end in sleeve A2 also form an annular auxiliary flow-limiting hole L5, and the outer sidewall of the outermost annular sleeve 301 and the opening edge of the liquid outlet Q2 form an annular auxiliary flow-limiting hole L5.

[0052] In the embodiments of this application, such as Figure 3 As shown, when there is only one annular sleeve 301, a second cavity Q4 can be formed between the annular sleeve 301 and the sleeve A2, circumferentially enclosing the first cavity Q31. A third cavity Q5, circumferentially enclosing the second cavity Q4, can be formed between the annular sleeve 301 and the inner wall of the throttle valve housing 102. In this way, the outer cavity absorbs the noise of the inner cavity, further reducing the noise of the throttle valve. For example, the vibration and noise are greatest in the first cavity Q31, and the second cavity Q4 circumferentially encloses the first cavity Q31, absorbing the vibration and noise in the first cavity Q31. The third cavity Q5 circumferentially encloses the second cavity Q4, absorbing the vibration and noise in the second cavity Q4.

[0053] Optional, such as Figure 5As shown, when there are multiple annular sleeves 301, a fourth cavity Q6 can be formed between adjacent annular sleeves 301 and sleeve A2, circumferentially enclosing the first cavity Q31, and a fifth cavity Q7 can be formed between adjacent auxiliary sleeves A3 and annular sleeves 301. Here, multiple auxiliary sleeves A3 and multiple annular sleeves 301 are arranged at intervals to form multiple fifth cavities Q7, and the outer fifth cavity Q7 along the radial direction of sleeve A2 can enclose the inner fifth cavity Q7, so that the outer fifth cavity Q7 can absorb the vibration and noise in the inner fifth cavity Q7.

[0054] This application embodiment also provides a water purification device, which may include any of the above-described throttling valves, and the water purification device uses the throttling valve to limit the liquid flow rate in the water purification device.

[0055] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0056] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A throttle valve characterized by, The throttle valve has an inlet hole, at least two flow-limiting holes, and an outlet hole arranged in sequence. The water passage area of ​​the second-level flow limiting hole arranged adjacent to each other in the at least two-level flow limiting holes is larger than that of the first-level flow limiting hole. In the channel along the flow channel of the liquid guided by the throttle valve, the second-level flow limiting hole is closer to the liquid outlet hole than the first-level flow limiting hole, and the water passage area of ​​the first-level flow limiting hole closest to the liquid inlet hole is the smallest. The liquid enters the throttle valve through the inlet hole, and flows out through the outlet hole after passing through the at least two flow-limiting holes.

2. The throttle valve according to claim 1, characterized by The throttle valve includes: a throttle valve body, a first plug and a second plug, wherein the first plug and the second plug are respectively installed at both ends of the throttle valve body along the axial direction of the throttle valve body; the throttle valve body has a flow guide located between the first plug and the second plug; The flow guide has a primary flow limiting hole and a secondary flow limiting hole arranged along the axial direction of the throttle valve body, and the water passage area of ​​the secondary flow limiting hole is larger than that of the primary flow limiting hole; the liquid inlet hole, the first plug and the flow guide form a water inlet cavity, and the liquid outlet hole, the second plug and the flow guide form a water outlet cavity.

3. The throttle valve according to claim 2, characterized by The throttle valve body includes: a throttle valve housing and the flow guide, wherein the flow guide is fixed inside the cavity of the throttle valve housing; The first plug is sealed to one end of the throttle valve housing, and the second plug is sealed to the other end of the throttle valve housing; the inlet and outlet holes are both distributed on the side of the throttle valve housing and communicate with the cavity of the throttle valve housing.

4. The throttle valve according to claim 3, characterized by The flow guide includes a support and a flow restrictor. The support is fixedly connected to the inner wall of the throttle valve housing. The support has a first flow guide cavity, and openings at both ends of the first flow guide cavity and the secondary flow restrictor. At least a portion of the flow restrictor is installed in the first flow guide cavity through the opening, and the end of the portion of the flow restrictor located in the first flow guide cavity has a first cavity between it and the secondary flow restrictor. The flow restrictor has a second flow guiding cavity, a first opening and a primary flow restricting orifice distributed at both ends of the second flow guiding cavity, and the primary flow restricting orifice is located between the first opening and the secondary flow restricting orifice.

5. The throttle valve according to claim 4, characterized by The flow-limiting plug is detachably connected to the first flow-guiding cavity of the support at the opening.

6. The throttle valve of claim 4 wherein, The support includes an annular connecting part and a sleeve. The annular connecting part is fixedly connected to the inner wall of the throttle valve housing and the outer circumferential surface of the sleeve, respectively. The target portion in the sleeve is distributed on the side of the annular connecting part facing the second plug. The side of the second plug facing the support has an annular sleeve distributed between the outer circumferential surface of the target portion and the inner wall of the throttle valve housing. The inner wall of the annular sleeve and the edge of the target portion form a three-level flow-limiting hole; the outer wall of the annular sleeve and the opening edge of the liquid outlet hole form a four-level flow-limiting hole. The water passage area of ​​the four-level flow-limiting hole is larger than that of the three-level flow-limiting hole, and the water passage area of ​​the three-level flow-limiting hole is larger than that of the two-level flow-limiting hole.

7. The throttle valve according to claim 6, characterized by When there is only one annular sleeve, a second cavity is formed between the annular sleeve and the sleeve, which circumferentially encloses the first cavity; a third cavity is formed between the annular sleeve and the inner wall of the throttle valve housing, which circumferentially encloses the second cavity.

8. The throttle valve of claim 4 wherein, The support member includes: an annular connecting portion and a sleeve. The annular connecting portion is fixedly connected to the inner wall of the throttle valve housing and the outer circumferential surface of the sleeve, respectively. The target portion in the sleeve is distributed on the side of the annular connecting portion facing the second plug. The side of the second plug facing the support member has a plurality of annular sleeves distributed between the circumferential surface of the target portion and the inner wall of the throttle valve housing. The plurality of annular sleeves are arranged sequentially along the radial direction of the sleeve. The support member further includes: a plurality of auxiliary sleeves fixedly connected to the side of the annular connecting portion facing the second plug. The plurality of auxiliary sleeves are arranged sequentially along the radial direction of the sleeve. The sleeve and multiple auxiliary sleeves are arranged in a crisscross pattern with the multiple annular sleeves. An auxiliary flow-limiting hole is formed between every two adjacent auxiliary sleeves and annular sleeves, and the water-passing area of ​​the multiple auxiliary flow-limiting holes increases sequentially along the channel for guiding the liquid.

9. The throttle valve according to claim 8, characterized by When there are multiple annular sleeves, a fourth cavity is formed between adjacent annular sleeves and the sleeve, circumferentially enclosing the first cavity, and a fifth cavity is formed between adjacent auxiliary sleeves and annular sleeves.

10. A water purification apparatus characterized by comprising: The throttle valve includes any one of the claims 1-9 above.

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