Control valve

Abstract

A control valve (10) comprises a valve body (1) and a flow rate preset assembly (8), wherein the flow rate preset assembly (8) comprises an adjustment rod (81), an operating component (83) and an adjusting component (82), wherein the operating component (83) is disposed on the bottom side of the valve body (1) in a manner rotatable about an axis and is connected in a shape-matched manner to an end of the adjustment rod (81) extending out of the valve body (1) to drive the adjustment rod (81) to rotate; and the adjusting component (82) is disposed in an inner cavity and fixedly connected to the adjustment rod (81), and the adjustment component (82) can be rotated between a first position and a second position under the drive of the adjustment rod (81) to set the maximum opening of the control valve (10). The control component (83) is provided with an indicator portion (831) on a surface facing the valve body (1) and / or on a surface facing away from the valve body (1), and its displacement relative to a reference position can indicate a maximum flow rate corresponding to the position of the regulating component (82), and the reference position is fixed relative to the valve body (1). The control valve facilitates the operator to observe and implement the preset flow rate, and the above operation can be completed without disassembling and reinstalling the actuator connected to the top of the valve body.

Description

Technical Field

[0001] The invention relates to a valve, in particular to a control valve. Background Art

[0002] Control valves are common control devices in the field of HVAC, and are widely used in industrial scenarios and civil heating systems that require fluid flow control. Control valves include switch valves that only have an on / off function, regulating valves that can adjust the flow in response to external control, and pressure-independent balancing valves. These control valves can have a flow preset function, that is, the maximum flow that can flow through the control valve is pre-set.

[0003] The existing flow preset control mechanism is generally set at the top of the valve body, and the actuator is usually also set at the top of the control valve. Due to space and other reasons, the size of the preset flow cannot be intuitively reflected to the user. When performing flow preset timing on such a control valve (especially for a small-diameter control valve), it is necessary to first remove the actuator on the top of the control valve to see the dial indicating the preset flow value, and then reinstall the actuator on the control valve after adjusting the flow preset mechanism.

[0004] In addition, the existing flow preset mechanism usually reuses the same valve stem as the valve plug assembly for adjusting the flow. When the flow preset mechanism operates, it will drive the valve stem to move together. In some applications, the flow preset is achieved by controlling the valve stem stroke in the axial direction. Such an operation is relatively cumbersome, and because the axial stroke of the valve stem must be limited, it will affect other functions of the valve. Summary of the invention

[0005] An object of the present invention is to provide a control valve that facilitates an operator to observe and implement flow preset without having to disassemble and reinstall an actuator connected to the top of the valve body.

[0006] To achieve the above object, the present invention provides a control valve, comprising:

[0007] a valve body having a fluid inlet, a fluid outlet, and an inner cavity in fluid communication with the fluid inlet and the fluid outlet;

[0008] A flow rate preset component, comprising:

[0009] an adjusting rod, one end of which extends from the bottom of the valve body and the other end of which extends into the inner cavity, and the adjusting rod can rotate around its own axis;

[0010] a control component, which is disposed on the bottom side of the valve body in a manner rotatable around the axis and is connected to the end of the adjustment rod extending out of the valve body in a shape-matched manner to drive the adjustment rod to rotate;

[0011] an adjusting component, which is disposed in the inner cavity and fixedly connected to the adjusting rod, and the adjusting component can be rotated between a first position and a second position under the driving of the adjusting rod to set the maximum opening of the control valve;

[0012] Wherein, the control component is provided with an indicator on the surface facing the valve body and / or on the surface facing away from the valve body, and its offset relative to a reference position can indicate the maximum flow corresponding to the position of the regulating component, and the reference position is fixed relative to the valve body.

[0013] According to this solution, an indicator is provided on the outer surface of the valve body to indicate the flow value preset by the regulating component, and the operator can adjust the flow preset component by observing the indicator, and the operation can be completed without disassembling the valve body.

[0014] In one embodiment, a radial dimension of the operating component is greater than a radial dimension of the valve body. Preferably, the operating component is a hand wheel.

[0015] According to this solution, the hand wheel can be convenient for users to operate.

[0016] In one embodiment, the indicator portion includes a dial, which is arranged at an edge position of the control component;

[0017] The reference position is a pointer portion fixed relative to the valve body and extending to the outside of the indicating portion of the operating component.

[0018] According to this solution, the coordination of the indicator and the reference position is relatively simple and easy to observe and read.

[0019] In one embodiment, it further comprises: a regulating valve assembly, which is disposed in the inner cavity and can adjust the opening of the control valve under the drive of a valve stem;

[0020] Wherein, the adjusting rod is independent of the valve stem.

[0021] According to this solution, the valve opening can be preset without affecting the valve stem.

[0022] In one embodiment, the control valve further comprises a locking member disposed at the operating component, which can be operated to switch between a free position allowing the operating component to rotate relative to the valve body and a locking position preventing the operating component from rotating relative to the valve body.

[0023] According to this solution, the control component can be locked relative to the valve body, thereby improving the stability of the valve during operation. The locking member can allow the flow preset component to move to achieve the flow preset, and can also lock the flow preset component.

[0024] In one embodiment, it further comprises a detachable valve cover disposed at the bottom of the valve body, the valve cover having a through hole for the adjusting rod to pass through and extend therefrom, and the valve cover also having a plurality of teeth disposed on a surface facing the operating component and arranged around the axis;

[0025] The locking member has a locking portion, which is arranged to extend from the operating component to the valve cover, wherein when the locking member is in a locked position, the locking portion and the tooth portion interfere with each other, thereby preventing the operating component from rotating relative to the valve body; when the locking component is in a free position, the interference between the locking portion and the tooth portion is released.

[0026] In one embodiment, the free position and the locking position of the locking member are distributed along a radial direction perpendicular to the axis; preferably, the locking portion is configured to be suitable for being clamped between two adjacent tooth portions at the locking position.

[0027] According to the above three solutions, the mutual locking relationship between the valve cover and the control component is relatively stable and easy to achieve.

[0028] In one embodiment, the control component is provided with a penetrating sliding groove extending in a radial direction, and the locking member is adapted to be inserted into the sliding groove and can slide between the locking position and the position along the length direction of the sliding groove;

[0029] The locking member further comprises an operating portion, which extends out of the operating component in a direction away from the valve body;

[0030] Wherein, the locking component includes an anti-falling portion located on a side of the sliding groove close to the valve cover. In one embodiment, the locking portion is arranged on the surface of the anti-falling portion facing the valve cover, and the sliding groove is smaller in lateral dimension than the anti-falling portion.

[0031] According to this solution, the locking component has a simple structure and can be stably connected to the operating component, while being able to conveniently lock the operating component.

[0032] In one embodiment, a protrusion is further provided on the inner wall of the sliding groove, which is located between the locking position and the free position, and is configured to keep the locking member at the current locking position or the free position without external manipulation;

[0033] Preferably, a portion of the locking member passing through the sliding slot has a rounded edge.

[0034] In one embodiment, it further comprises an elastic member, one end of which is fixedly connected to the locking member and the other end of which is fixedly connected to the operating component, and the elastic member is arranged so that the locking member is subjected to a biasing force biased toward the locking position.

[0035] According to the above two solutions, the locking member can be easily switched between the two positions.

[0036] In one embodiment, the control component can be engaged with the valve cover, and has a rotatable position and an engaged position in the axial direction, wherein in the engaged position, the control component and the valve cover are engaged with each other so that the control component is fixed relative to the valve cover; in the rotatable position, the engagement between the control component and the valve cover is released so that the control component can rotate around the axis relative to the valve cover.

[0037] In one embodiment, the valve cover is provided with a first buckle portion on its outer edge.

[0038] The control component is provided with a second buckle portion on the inner edge of the side facing the valve cover, which is suitable for being hooked on the first buckle portion and can reach the engaging position and be clamped with the first buckle portion under the action of gravity;

[0039] Wherein, when the operating component is exerted with a force in a direction toward the valve cover to reach the rotatable position, the engagement between the first buckle portion and the second buckle portion is released.

[0040] In one embodiment, the first buckle portion is a component independent of the valve cover, and can be sleeved on the bottom of the valve cover.

[0041] According to the above-mentioned solutions, the engagement between the valve cover and the control component can be easily achieved, and the engagement can also be easily released.

[0042] In one embodiment, the indicator is detachably mounted on the control component. According to this solution, the indicator can be easily replaced and repaired.

[0043] The control valve provided by the present invention has at least the following advantages: 1. An indicator is provided on the outer surface of the valve body to indicate the value of the flow preset by the regulating component. The operator can adjust the flow preset component by observing the indicator, and the operation can be completed without disassembling the valve body; 2. A locking component is provided on the flow preset component. On the one hand, the locking component can allow the flow preset component to move to achieve the flow preset, and on the other hand, it can lock the flow preset component; 3. The valve provided by the present invention has simple and easy control over the flow preset component, and since the regulating rod is independent of the valve stem, the operation will not affect the valve stem; 4. The control valve that can achieve the above functions has a simple structure and a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The following drawings are intended only to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0045] Figure 1 is a three-dimensional schematic diagram of a control valve according to a preferred embodiment of the present invention;

[0046] Figure 2 for Figure 1 A cross-sectional schematic diagram of a control valve in FIG.

[0047] Figure 3 for Figure 2 A partial enlarged schematic diagram of the portion enclosed by the dotted line in FIG.

[0048] Figure 4 for Figure 3 A schematic diagram of a locking member in a locked position;

[0049] Figure 5 for Figure 1 Schematic diagram of the bottom structure of the control valve in FIG. 1 , in which the valve cover, the operating component and the locking member are in a separated state;

[0050] Figure 6 for Figure 5 A three-dimensional schematic diagram of the control components in FIG.

[0051] List of reference numerals:

[0052] Control valve 10

[0053] Stem 21

[0054] Valve body 1

[0055] Fluid inlet 12

[0056] Fluid outlet 14

[0057] Control parts 83

[0058] Dial 831

[0059] Slide slot 834

[0060] Bump 8341

[0061] Accommodation section 835

[0062] Second buckle portion 836

[0063] Valve cover 6

[0064] Pointer 61

[0065] Tooth 62

[0066] Through hole portion 63

[0067] The first buckle portion 64

[0068] Locking member 7

[0069] Operation section 71

[0070] Through section 72

[0071] Anti-falling part 73

[0072] Locking portion 731

[0073] Adjustment rod 81

[0074] Adjustment component 82 DETAILED DESCRIPTION

[0075] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0076] The present invention provides a control valve capable of preset flow rate, as shown below Figures 1 to 6 , a preferred embodiment of the present invention is described. The control valve 10 in this embodiment includes a valve body 1 and a flow preset assembly 8. The valve body 1 has a fluid inlet 12 and a fluid outlet 14, and an inner cavity 16 in fluid communication with the fluid inlet 12 and the fluid outlet 14. Figure 1 and Figure 2 The arrow on the valve body 1 in the figure indicates the flow direction of the fluid in the inner cavity 16. The flow preset component 8 provided in the control valve 10 can preset the maximum allowable flow of the control valve 10 during operation, that is, limit the maximum opening of the valve. The control valve 10 can be a flow regulating valve for regulating the flow, or it can be a switch valve with only on and off functions. Although the flow regulating valve is taken as an example in the accompanying drawings, it can be understood by those skilled in the art that the control valve 10 can also be a switch valve.

[0077] like Figure 2As shown, the flow preset assembly 8 includes an adjusting rod 81, an adjusting component 82 and a control component 83. Specifically, one end of the adjusting rod 81 of the flow preset assembly 8 extends from the bottom of the valve body 1, and the other end extends into the inner cavity 16, and the adjusting rod 81 can rotate relative to the valve body around its own axis Y. The control component 83 is placed on the bottom side of the valve body 1 in a rotatable manner around the axis Y, and is connected to the end 811 of the adjusting rod 81 extending out of the valve body 1 in a shape-matched manner to drive the adjusting rod 81 to rotate. The adjusting component 82 is arranged in the valve body 1 and fixedly connected to the adjusting rod 81. The adjusting component 82 can rotate between a first position and a second position under the drive of the adjusting rod 81 to set the maximum opening of the control valve 10. For example, when the adjusting component 82 is in the first position, the adjusting component 82 can block the fluid flow path to the maximum extent, and the control valve 10 has the minimum preset flow; when the adjusting component 82 is in the second position, the adjusting component 82 blocks the fluid flow path to the minimum extent, and the control valve 10 has the maximum preset flow. The adjusting component 82 can be driven by the adjusting rod 81 to rotate to any position between the first and second positions, and the flow rate corresponding to the position is the preset flow rate.

[0078] The control component 83 of the flow preset assembly 8 is arranged on the bottom side of the valve body 1, and an indicator 831 is arranged on its surface facing the valve body 1 and / or on its surface facing away from the valve body. The deviation of the indicator 831 relative to the reference position can indicate the maximum flow corresponding to the position of the adjustment component, wherein the reference position is fixed relative to the valve body.

[0079] Since the adjusting component 82 and the operating component 83 are relatively fixed in the circumferential direction relative to the adjusting rod 81, the adjusting rod 81, the adjusting component 82 and the operating component 83 can rotate together. When the operating component 83 drives the adjusting component 82 to rotate to a predetermined position between the first position and the second position, the operating component 83 also rotates to the corresponding position, and the indicator provided on the operating component 83 can indicate the preset flow rate at this time. Preferably, for example, the indicator 831 is a dial 831 formed on the bottom and top surfaces of the operating component 83, such as Figure 3-5 As shown. The reference position is a pointer 61 formed on the valve cover 6 (described in detail later). The pointer 61 points to the corresponding scale on the dial 831, and the value of the preset flow rate at this time can be understood by reading the scale value pointed by the pointer. Of course, in other embodiments not shown, the setting of the indicator and the reference position can have other multiple options. For example, the pointer can be set on the valve body or on other components fixed relative to the valve body; for another example, the indicator can be a pointer set at the bottom and / or top of the control component, and the reference position is correspondingly a dial set on the valve body or a component fixed relative to the valve body.

[0080] During operation, the operator can rotate the control component 83 to the desired position by observing the matching relationship between the pointer and the dial, and the adjustment component 82 in the valve body 1 will also reach the predetermined position at the same time. In other words, the operator does not need to disassemble the valve body when adjusting the adjustment component 82, and can directly rotate the adjustment component 82 to the desired position through the pointer and scale set on the outer surface of the valve body. Preferably, the radial dimension of the control component 83 is larger than the radial dimension of the valve body 1, and more preferably, the control component 83 is a hand wheel. In this way, even if the operator rotates the control component while looking down from the top of the valve body 1, he can observe the scale position indicated by the indicator, that is, the desired preset flow rate.

[0081] In this embodiment, the control component 83 not only drives the adjustment component 82 to reach the position corresponding to the preset flow rate, but also can synchronously give the preset flow rate indication. More preferably, the operator can also conveniently observe the preset flow rate indication. Such a structure can save the setting of components and avoid the cumbersome configuration and operation of the flow preset component 8.

[0082] On the other hand, Figure 2 In the given embodiment, the control valve 10 also preferably includes a regulating valve assembly 2, which is placed in the inner cavity and can adjust the opening of the control valve 10 under the drive of a valve stem 21. In addition, the adjustment rod 81 can be independent of the valve stem 21. More preferably, the valve stem 21 can be connected to an actuator (not shown), and the regulating valve assembly 2 also includes a valve plug. Driven by the actuator, the valve stem 21 can drive the valve plug to partially or completely block the fluid channel, that is, the valve plug can change the flow diameter of the fluid channel under the drive of the actuator, which is also called the valve opening. From the overall perspective of the control valve 10, the maximum opening of the valve is controlled by the flow preset component 8.

[0083] In this embodiment, the adjustment rod 81 is independent of the valve stem 21, so that there is no need to limit the stroke of the valve stem 21 when performing flow preset, so that the flow preset step is basically independent of the flow control step in use.

[0084] On the other hand, Figure 2 In the given embodiment, the control valve 10 preferably includes a balanced regulating valve assembly 9, which is placed at the lower part of the inner cavity and can automatically balance the pressure difference in response to the change of the fluid pressure difference at the fluid inlet 12 and in the inner cavity 16, so as to fix the pressure difference at a desired pressure difference value. The control valve with the balanced regulating valve assembly is also called a pressure independent regulating valve (PICV).

[0085] It should be noted that the "axial direction of the adjusting rod" mentioned herein refers to the Y direction as shown in the figure. It can be understood that if the valve stem 21 and the axis of the adjusting rod 81 are collinear, then the axial direction of the valve stem 21 is also Figure 1-6The Y direction shown in the figure; and the rotation direction of the adjusting component 82, the adjusting rod 81 and the operating component 83 mentioned in this article are all rotational movements around the Y direction. In addition, the expression of a certain component between two positions mentioned in this article includes the situation when the component is at the end position. For example, the expression "the adjusting component is between the first position and the second position" includes the situation when the adjusting component is at the first position and the situation when the adjusting component is at the second position.

[0086] Preferably, the control valve 10 further comprises a valve cover 6, which is detachably arranged at the bottom of the valve body 1 and has a through hole for the adjustment rod 81 to pass through the through hole and be fixedly engaged with the control component 83. Figure 5 to Figure 6 As shown in the through hole portion 63 of the valve cover 6 in the figure, the wall surface defining the through hole extends axially, so that the through hole has a larger axial dimension. Such a configuration makes the connection between the adjusting rod 81 and the valve cover 6 relatively stable when the adjusting rod 81 is accommodated in the through hole, and the adjusting rod 81 is not easy to deflect due to the restraining effect of the through hole. It can be understood that since the control component 83 is fixed relative to the adjusting rod 81, the valve cover 6 is fixed relative to the valve body 1, and the adjusting rod 81 can rotate relative to the valve body 1, the control component 83 can rotate relative to the valve cover 6.

[0087] Preferably, the control valve 10 further comprises a locking member 7 disposed at the operating component 83, and the locking member 7 can be operated to move between a free position allowing the operating component 83 to rotate relative to the valve cover 6 and a locking position preventing the operating component 83 from rotating relative to the valve cover 6. Figures 4 to 6 In this embodiment, the free position and the locked position are the positions of the locking member 7 relative to the operating member 83. When the locking member 7 is in the locked position, the locking member 7 can engage with the valve cover 6 to limit the rotation of the operating member 83 relative to the valve cover 6. This state is determined by Figure 3 When the locking member 7 is in the free position, the locking member 7 and the valve cover 6 are released to allow the operating member 83 to rotate relative to the valve cover 6, the state is determined by Figure 4 Shown.

[0088] Preferably, if Figure 5As shown, a tooth portion 62 is provided on the bottom surface of the valve cover 6, and a locking portion 731 is provided on the top surface of the locking member 7 (specifically, on the top surface of the anti-dropping portion 73). When the locking member 7 is in the locked position, the locking portion 731 and the tooth portion 62 interfere with each other, thereby preventing the operating member 83 from rotating relative to the valve body 1; when the locking member 7 is in the free position, the interference between the locking portion 731 and the tooth portion 62 is released. Preferably, there are multiple tooth portions 62, and the multiple tooth portions 62 are arranged around the axis Y on the bottom surface of the valve cover 6, and each tooth portion 62 extends radially on the bottom surface of the valve cover 6. The movement trajectory of the locking member 7 between the free position and the locked position is distributed along a radial direction perpendicular to the axis Y, and its movement trajectory is roughly as follows: Figure 3-4 . Preferably, the locking portion 731 can be adapted to be clamped between two adjacent tooth portions 62 at the locking position. Further, the position setting of the tooth portion 62 corresponds to each predetermined position of the adjustment component 82. When the adjustment component 82 is rotated to a predetermined position, the locking member 7 is moved to the locking position, and the locking portion 731 can cooperate with the corresponding tooth portion 62 to fix the control component 83 there.

[0089] Furthermore, the number of teeth 62 corresponds to the number of preset flow levels, and when the adjusting component 82 realizes each level of preset flow, the locking portion 731 can cooperate with the corresponding teeth 62. For example, if the flow preset component can preset the flow to twenty different values, that is, the adjusting component 82 has twenty preset positions between the first position and the second position, then the number of teeth 62 also corresponds to twenty, and the positions of these twenty teeth 62 correspond to the twenty preset positions of the adjusting component 82. When the adjusting component 82 reaches a certain preset position, the locking member 7 can cooperate with one tooth 62 after sliding to the locking position. It can be understood that if it is desired that the flow preset component can realize stepless adjustment of the preset flow, the number of teeth 62 can be set to be sufficient, so that every time the preset flow changes a little, the corresponding teeth 62 can cooperate with the locking portion 731 when the locking member 7 slides to the locking position.

[0090] In this embodiment, the locking member 7 is switched between the locking position and the free position by sliding. A radially extending through sliding groove 834 is provided on the bottom of the manipulation component 83 to facilitate the sliding of the locking member 7. The locking member 7 is adapted to be inserted into the sliding groove 834 and can slide between the locking position and the free position along the length direction of the sliding groove 834.

[0091] Further, refer to Figure 5It can be seen that the locking member 7 includes an anti-falling portion 73, a penetrating portion 72 and an operating portion 71 from top to bottom, wherein the operating portion 71 extends out of the operating component from a direction away from the valve body 1 and can be touched by the operator, and the operator can move the locking member 7 between the locking position and the free position by applying force to the operating portion 71; the anti-falling portion 73 is located on the side of the sliding groove 834 close to the valve body 1, and its lateral dimension (i.e., the dimension parallel to the bottom wall of the operating component 8 and perpendicular to the sliding direction of the locking member 7) is larger than the sliding groove 834. Such an arrangement can prevent the locking member 7 from falling off from the sliding groove 834, and the locking portion 731 is arranged on the anti-falling portion 73; the penetrating portion 72 penetrates the sliding groove 834, and the size of the penetrating portion 72 is adapted to the size of the sliding groove 834. The assembly relationship between the locking member 7 and the operating component 83 is as follows: Figure 5 As shown in FIG. 8 , the locking member 7 can be mounted to the operating component 83 generally upwardly in the Z direction.

[0092] In order to stably position the locking member 7 in the free position or the locked position, various structures may be provided on the operating member 83 and / or the locking member 7. For example, the locking member 7 and the operating member 83 may be made of plastic material, and a protrusion 8341 (such as a protrusion 8342) may be provided between the sliding groove 834 and the free position. Figure 5 More preferably, the protrusion 8341 has an arc-shaped surface, and the connection between the side walls of the through-portion 72 of the locking member 7 is formed into a rounded corner (as shown in FIG. Figure 5 As shown in the figure, when there is no external force, the protrusion 8341 can block the through portion 72 and thus restrict the locking member 7 to the locked position or the free position; when an external force is applied to the locking member 7, since the plastic can be slightly deformed, the rounded corner can pass over the protrusion 8341 and thus the locking member 7 can achieve position switching.

[0093] For another example, an elastic member may be installed on the locking member 7 and / or the operating member 83, one end of which is fixedly connected to the locking member 7 and the other end of which is fixedly connected to the operating member 83, and the elastic member is arranged so that the locking member is subjected to a biasing force biased toward the locking position. For example, when the locking member 7 is in the locking position, the elastic member may be in a natural state or have a slight biasing force, and when the locking member 7 slides from the locking position to the free position, the elastic member is biased and has a biasing force that biases the locking member 7 from the free position back to the locking position, and after the operating member 83 completes the rotation, the external force disappears, and the locking member 7 can naturally rebound to the locking position under the biasing force of the elastic member.

[0094] The control component 83 can be engaged with the valve cover 6, and has a rotatable position and an engaged position in the Y direction, wherein, in the engaged position, the control component 83 and the valve cover 6 are engaged with each other so that the control component 83 is fixed relative to the valve cover 6; in the rotatable position, the engagement between the control component 83 and the valve cover 6 is released, so that the control component 83 can be rotated around the axis Y relative to the valve cover 6.

[0095] To achieve the above purpose, refer to Figure 3-4 The bottom edge of the body of the valve cover 6 is provided with a first buckle portion 64 protruding radially outward, and the inner edge of the control member 83 is provided with a second buckle portion 836, which is suitable for hooking on the first buckle portion 64, and can reach the engaging position under the action of gravity and clamp with the first buckle portion 64. When the control member 83 is applied with a force toward the valve cover 6 and reaches the rotatable position, the engagement between the first buckle portion 64 and the second buckle portion 836 is released. Since the first buckle portion 64 and the second buckle portion 836 only interact with each other in the axial direction and do not have a radial interaction force, the cooperation of the first buckle portion 64 and the second buckle portion 836 can prevent the control member 83 from moving relative to the valve cover 6 in the axial direction, but will not prevent the control member 83 from rotating relative to the valve cover 6 around the axis, that is, only the rotational freedom of the control member 83 is retained.

[0096] It can be understood that, since the first buckle portion 64 and the second buckle portion 836 are in contact with each other, when the control member 83 has a tendency to rotate relative to the valve cover 6, friction will be generated between the first buckle portion 64 and the second buckle portion 836 to prevent the rotation of the control member 83. In order to avoid this situation, when the control member 83 needs to be rotated, an upward force needs to be applied to the control member 83 to disengage the first buckle portion 64 and the second buckle portion 836, and then the control member 83 is further rotated.

[0097] In other embodiments not shown, the first buckle portion may be a component independent of the valve cover, which can be sleeved on the bottom of the valve cover.

[0098] In other embodiments not shown, the indicator may not be directly formed on the operating component, but may be detachably mounted on the operating component.

[0099] Preferably, in addition to the aspects described above, this embodiment may also have more preferred settings.

[0100] For example, the adjustment component 82 can realize a multi-stage preset flow rate, for example, between the preset flow rate realized in the first position and the preset flow rate realized in the second position, the multi-stage preset flow rate can be set with an increment of 5% or 2% for each stage. Alternatively, each tooth portion and the gap between the tooth portions can be set small enough so that the flow preset component is set to make the preset flow rate realize a nearly stepless variable.

[0101] At the same time, the scale of the dial 831 can correspond to the preset flow level, so that when the adjustment component 82 realizes each level of preset flow, the pointer 61 can point to the corresponding scale of the dial 831.

[0102] The connection relationship between the various components can also be arranged in a variety of ways. For example, for the connection between the adjustment rod 81 and the control component 83, a receiving portion 835 with a top opening can be provided on the control component 83 to receive the bottom of the adjustment rod 81. The specific structure of the receiving portion 835 is as follows: Figure 6 In order to avoid relative rotation between the adjusting rod 81 and the operating member 83, the bottom of the adjusting rod 81 can be set to have a non-circular radial cross section. The bottom of the adjusting rod 81 can be a non-cylindrical body. For example, the bottom surface of the adjusting rod 81 can be formed into a D shape. The shape of the accommodating portion 835 corresponds to the shape of the bottom of the adjusting rod 81. Figure 6 From the top view angle given in FIG. 8 , it can be observed that the accommodation portion 835 is also correspondingly D-shaped. Thus, when the adjustment rod 81 is accommodated in the accommodation portion 835, since the adjustment rod 81 and the accommodation portion 835 are not cylindrical, the adjustment rod 81 cannot rotate in the accommodation portion 835, and the control component 83 is fixed relative to the valve cover 6 in the rotation direction. Furthermore, since the control component 83 and the adjustment rod 81 each have an axial constraint, the two are also fixed to each other in the axial direction.

[0103] When the operator needs to adjust the preset flow of the control valve, first slide the locking member 7 from the locked position to the free position by manipulating the operating part 71 of the locking member 7, and then slightly push the operating component 83 upward in the axial direction to make it disengage from the valve cover 6 so as to facilitate rotation. Next, rotate the operating component 83, and stop the operating component 83 at the desired position by reading the scale on the dial 831 pointed by the pointer 61. At this time, the adjustment component 82 in the valve body 1 also rotates to the predetermined position accordingly to achieve the desired preset flow. Subsequently, slide the locking member 7 to the locked position again to lock the flow preset component at this position.

[0104] The control valve of the present invention has the following advantages: 1. A pointer and a scale are arranged on the outer surface of the valve body to indicate the value of the flow preset by the regulating component. The operator can adjust the flow preset component by observing the matching relationship between the pointer and the scale, and the operation can be completed without disassembling the valve body; 2. A locking component is arranged on the flow preset component. On the one hand, the locking component can allow the flow preset component to move to realize the flow preset, and on the other hand, it can lock the flow preset component; 3. The control of the flow preset component is simple and easy to implement, and since the regulating rod is independent of the valve stem, the operation will not limit the stroke of the valve stem; 4. The control valve capable of realizing the above functions has a simple structure and a low manufacturing cost.

[0105] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0106] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A control valve (10), characterized in that: include: A valve body (1) having a fluid inlet (12), a fluid outlet (14), and an inner cavity (16) in fluid communication with the fluid inlet (12) and the fluid outlet (14); A flow rate preset component (8), comprising: an adjusting rod (81), one end of which extends from the bottom of the valve body (1) and the other end of which extends into the inner cavity (16); the adjusting rod (81) is capable of rotating around its own axis (Y); a control component (83) disposed on the bottom side of the valve body (1) in a manner rotatable about the axis (Y) and connected in a form-fitting manner to an end (811) of the adjustment rod (81) extending out of the valve body (1) to drive the adjustment rod (81) to rotate; and an adjusting component (82) disposed in the inner cavity (16) and fixedly connected to the adjusting rod, wherein the adjusting component (82) is capable of rotating between a first position and a second position under the drive of the adjusting rod (81) to set the maximum opening of the control valve (10); a valve cover (6) disposed at the bottom of the valve body (1), the valve cover further comprising a plurality of teeth (62), the teeth (62) being disposed on a surface facing the control component (83) and arranged around the axis (Y); and a locking member (7) disposed at the operating member (83), the locking member (7) being operable to switch between a free position allowing the operating member (83) to rotate relative to the valve body (1) and a locking position preventing the operating member (83) from rotating relative to the valve body (1), the free position and the locking position of the locking member (7) being distributed along a radial direction perpendicular to the axis (Y); the locking member (7) having a locking portion (731) arranged to extend from the operating member (83) toward the valve cover (6), wherein when the locking member (7) is in the locking position, the locking portion (731) and the tooth portion (62) interfere with each other, thereby preventing the operating member (83) from rotating relative to the valve body (1), and the locking portion (731) is clamped between two adjacent tooth portions (62) at the locking position; when the locking member (7) is in the free position, the interference between the locking portion (731) and the tooth portion (62) is released; The control component (83) is provided with an indicator portion (831) on a surface facing the valve body (1) and / or on a surface facing away from the valve body (1), and its displacement relative to a reference position can indicate a maximum flow rate corresponding to the position of the regulating component (82), and the reference position is fixed relative to the valve body.

2. The control valve according to claim 1, characterized in that: The radial dimension of the control component (83) is greater than the radial dimension of the valve body (1), and the control component is a hand wheel.

3. The control valve according to any one of claims 1 to 2, characterized in that: The indicating portion (831) comprises a dial, which is arranged at an edge position of the operating component (83); The reference position is a pointer portion (61) fixed relative to the valve body (1), which extends to the outside of the indicating portion (831) of the operating component (83).

4. The control valve according to claim 1, characterized in that: Also includes: a regulating valve assembly (2), which is disposed in the inner cavity (16) and is capable of adjusting the opening of the control valve (10) under the drive of a valve stem (21); Wherein, the adjustment rod (81) is independent of the valve stem (21).

5. The control valve according to claim 1, characterized in that: The valve cover (6) is detachable, and has a through hole for the adjusting rod (81) to pass through and extend out.

6. The control valve according to claim 5, characterized in that The control component (83) is provided with a penetrating sliding groove (834) extending in a radial direction, and the locking member (7) is suitable for being inserted into the sliding groove (834) and being able to slide between the locking position and the position along the length direction of the sliding groove; The locking member (7) further comprises an operating portion (71) extending out of the operating component (83) in a direction away from the valve body (1); The locking member comprises an anti-dropout portion (73) located on a side of the sliding groove close to the valve cover, the locking portion is arranged on a surface of the anti-dropout portion facing the valve cover, and the sliding groove is smaller in lateral dimension than the anti-dropout portion (73).

7. The control valve according to claim 6, characterized in that The inner wall of the sliding groove (834) is also provided with a protrusion (8341) located between the locking position and the free position, which is configured to enable the locking member (7) to remain in the current locking position or the free position without external manipulation; Furthermore, the portion (72) of the locking member (7) that passes through the sliding groove (834) has a rounded edge.

8. The control valve according to any one of claims 4 to 7, characterized in that: It also includes an elastic member, one end of which is fixedly connected to the locking member (7) and the other end of which is fixedly connected to the operating component (83), and the elastic member is arranged so that the locking member (7) is subjected to a biasing force biased toward the locking position.

9. The control valve according to claim 4, characterized in that: The control component (83) can be engaged with the valve cover (6), and has a rotatable position and an engaged position in the direction of the axis (Y), wherein, in the engaged position, the control component (83) and the valve cover (6) are engaged with each other so that the control component (83) is fixed relative to the valve cover; in the rotatable position, the engagement between the control component (83) and the valve cover (6) is released so that the control component (83) can be rotated around the axis (Y) relative to the valve cover (6).

10. The control valve according to claim 9, characterized in that The valve cover (6) is provided with a first buckle portion (64) on its outer edge. The control component (83) is provided with a second buckle portion (836) on the inner edge of the side facing the valve cover (6), which is suitable for being hooked on the first buckle portion (64) and can reach the engaging position and be fastened with the first buckle portion (64) under the action of gravity; Wherein, when the operating component (83) is exerted with a force in the direction of the valve cover (6) to reach the rotatable position, the engagement between the first buckle portion and the second buckle portion is released.

11. The control valve according to claim 10, characterized in that The first buckle portion (64) is a component independent of the valve cover (6), and can be sleeved on the bottom of the valve cover (6).

12. The control valve according to claim 1, characterized in that The indicating portion (831) is detachably mounted on the operating component (83).

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