Valve body

Abstract

The utility model discloses a valve body which comprises a valve main body, a valve cavity, a valve seat and a valve assembly, and the valve cavity is provided with an annular bottom wall surrounding the outer side of the valve seat; the annular bottom wall inclines downwards towards the liquid outlet flow channel and is provided with a highest point and a lowest point, and two flow guide walls are formed between the highest point and the lowest point of the annular bottom wall; wherein a steep section close to the highest point is arranged in the flow guide wall, and the slope of the steep section is K1; the vertical height difference between the highest point and the lowest point is H, the horizontal distance is L, and K1 is larger than H / L. The section, close to the highest point, of the flow guide wall is set to be the steep section, and the steep section can accelerate the flowing speed of fluid at the highest point, so that the fluid at the highest point can rapidly leave from the highest point, and the situation that the fluid at the highest point slowly flows to form a flowing dead zone is avoided; therefore, impurity deposition of the fluid at the highest point is avoided, and pollution to follow-up fluid is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and particularly relates to a valve body. Background Art

[0002] As a part of the pipeline system, the valve body drives the valve core inside the valve body to change the state of the fluid in the valve body. For example, a conventional globe valve realizes the on-off control of the flow path through the cooperation between the valve core and the valve seat, or changes the flow rate by changing the opening degree of the valve seat.

[0003] In the existing valve bodies, generally, a diaphragm valve disclosed in Patent No. 202321710039.3 is referred to. Figure 12 , which includes a valve main body 1, an upper shell 2 connected to the upper end of the valve main body 1, and a valve assembly 3; the valve main body 1 has an inlet flow passage 11, an outlet flow passage 12, and a valve port 13 for fluid to flow through, and the valve port 13 connects the inlet flow passage 11 and the outlet flow passage 12. It is found during use that in the valve cavity, impurity accumulation or crystal sedimentation is likely to occur in two regions, P1 and P2, which will affect the cleanliness or concentration of the fluid; as Figure 13 shown, further analyzing the valve body in Figure 12 , it is found that the fluid flow velocity at the bottom wall of the valve cavity in the two regions of P1 and P2 is slow, so flow dead zones are formed in these two regions, resulting in the accumulation of impurities or crystals in these two regions after long-term use. When other liquids flow through the valve cavity subsequently, the deposited impurities will contaminate the flowing liquid or the crystals will cause a change in the concentration of the fluid. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a valve body to solve the problem that the fluid flow velocity at the bottom wall of the valve cavity is slow and prone to generating flow dead zones.

[0005] To solve the above technical problem, the utility model adopts the following technical scheme: a valve body, including: a valve main body, which has an inlet liquid flow passage and an outlet liquid flow passage for fluid to flow in and out; a valve cavity, arranged inside the valve main body, and the valve cavity is communicated with the outlet liquid flow passage; a valve seat, arranged in the valve cavity, and includes a protruding wall and a communicating flow passage inside the protruding wall, and the communicating flow passage is used to communicate the valve cavity with the inlet liquid flow passage, and the valve cavity has an annular bottom wall surrounding the outside of the valve seat; a valve assembly, which is installed on the valve main body and extends into the valve cavity to cooperate with the valve seat to open and close the valve body; the annular bottom wall is inclined downward towards the outlet liquid flow passage, and has a highest point and a lowest point, and two diversion walls are formed between the highest point and the lowest point of the annular bottom wall; wherein, in the diversion walls, there is a steep section near the highest point, and the slope of the steep section is K1; the vertical height difference between the highest point and the lowest point is H, and the horizontal distance is L, where K1 > H / L. The technical scheme has the following technical effects:

[0006] In the present utility model, by obliquely arranging the annular bottom wall, when the valve body is opened, fluid flows into the communication channel through the liquid inlet channel and then enters the valve cavity. Since the annular bottom wall is obliquely arranged, the fluid flows along the two diversion walls from the highest point to the lowest point respectively and finally flows out of the valve body through the liquid outlet channel. During this process, the liquid flow rate at the highest point is increased, that is, the liquid flow rate at the highest point is relatively fast and it is not easy for impurities to settle or crystal aggregates to form. By arranging a steep section at a section of the diversion wall close to the highest point and setting the slope of the steep section to be greater than the slope of the line connecting the highest point and the lowest point, the slope of the bottom wall of the valve cavity near the highest point is made larger. The steep section can further increase the flow rate of the fluid at the highest point, so that the fluid at the highest point can quickly leave from the highest point to avoid the formation of a flow dead zone due to slow fluid flow at the highest point.

[0007] In the above structure, the slope of the line connecting the highest point and the lowest point is H / L. The slope of any point on the steep section or the annular bottom wall is as follows: Take any point P on the steep section or the annular bottom wall. Take the vertical plane passing through the central axis of the liquid outlet channel as the first reference plane M, and the second reference plane N passing through point P is parallel or coincident with the first reference plane M. On the second reference plane N, the wall surface of the steep section or the annular bottom wall forms a section line passing through point P, and the slope of this section line at point P is taken as the slope of the steep section or the annular bottom wall at point P. When point P is on the steep section, the slope of point P at this time is the aforementioned K1.

[0008] According to the principle of the brachistochrone curve, by arranging the diversion wall into a structure with a steep section, compared with the diversion wall with a constant slope, the fluid flows faster in the valve cavity. The fluid with a faster flow rate can also scour the lowest point of the diversion wall to avoid the formation of a flow dead zone due to slow fluid flow at the lowest point, and further avoid the deposition of impurities at the highest or lowest point of the fluid, thus causing pollution to the subsequent fluid.

[0009] In the above valve body, among the two places with different heights of the diversion wall, the slope of the place with a relatively lower height is not greater than the slope of the place with a relatively higher height. To ensure that the liquid can flow smoothly along the diversion wall from top to bottom, avoid the formation of steps or dead corners that cannot be scoured and hinder the flow on the diversion wall, and also avoid the formation of a flow dead zone on the side of the diversion wall.

[0010] In the above-mentioned valve body, the diversion wall has a curved surface structure, and the slope of the diversion wall gradually decreases from the highest point to the lowest point. The setting of the curved surface can avoid the dead zone formed at the highest point of the diversion wall while greatly accelerating the flow rate of the fluid, thereby greatly shortening the time for the fluid to flow through the diversion wall, increasing the flow rate of the valve body per unit time, preventing impurities from depositing in the valve cavity, and improving the user experience. At the same time, it ensures that there are no sudden changes or other structures in the entire diversion wall, so that the liquid can closely adhere to the diversion wall during the downward flow, further avoiding the formation of dead corners between the highest point and the lowest point of the diversion wall.

[0011] In the above-mentioned valve body, the diversion wall includes at least two connected diversion surfaces. The diversion surface closest to the highest point is the steep section; among adjacent diversion surfaces, the slope of the diversion surface relatively closer to the liquid outlet channel is smaller than that of the diversion surface farther from the liquid outlet channel. This facilitates the smooth flow of the fluid on the diversion wall, and the setting of multiple inclined surfaces is convenient for production and processing.

[0012] In the above-mentioned valve body, at least two diversion surfaces are all inclined surface structures with a fixed slope; or, at least two diversion surfaces include inclined surfaces with a fixed slope and curved surfaces, and in the curved surface structure, the slope decreases as the height decreases. When the fluid flows on the diversion surface, its flow velocity changes, avoiding the fluid flowing down at a constant speed, and thus making the fluid pressures of the two diversion walls flowing to the lowest point different, avoiding the pressure balance at the lowest point of the annular bottom wall and generating a flow dead zone.

[0013] In the above-mentioned valve body, the adjacent diversion surfaces are set with a smooth transition connection. This is to avoid the formation of dead corners at the connection of adjacent two diversion surfaces and ensure the smooth flow of the fluid on the diversion wall.

[0014] In the above-mentioned valve body, taking the vertical plane passing through the central axis of the liquid outlet channel as the first reference plane, the two diversion walls are asymmetrically arranged with respect to the first reference plane. Through the asymmetric structure, the position of the first reference plane in the valve cavity and the fluid pressures on both sides thereof are unbalanced, that is, there is no pressure balance area at the bottom wall of the valve body. The pressure difference generated by the pressure imbalance can drive the fluid to flow in the valve cavity, and thus can better avoid the occurrence of flow dead zones at the bottom wall of the valve cavity.

[0015] In the above-mentioned valve body, the diameter of the end of the communication channel connecting to the valve cavity increases upward. The diameter of the communication channel gradually increases from bottom to top, so that the fluid in the inlet channel can be more dispersed when entering the valve cavity through the communication channel, ensuring the full flow of the liquid in the valve cavity, avoiding the fluid concentrating in some areas of the valve cavity when it first enters the valve cavity, especially avoiding the fluid only concentrating on one side of the valve cavity close to the liquid outlet channel, resulting in a decrease in the flow rate, and ensuring the smooth flow between the valve cavity and the liquid outlet channel.

[0016] In the above-mentioned valve body, there is a groove between the outer side wall of the protruding wall and the annular bottom wall. The groove can ensure that even when the inclination angle of the annular bottom wall is relatively large, a small included angle will not be formed between the annular bottom wall and the outer side of the protruding wall, thus avoiding the accumulation of impurities and crystallization at this included angle.

[0017] In the above-mentioned valve body, the height of the connection between the annular bottom wall and the liquid outlet flow channel is equal to the height of the bottom wall of the liquid outlet flow channel, or the lowest end of the annular bottom wall is lower than the bottom wall of the liquid outlet flow channel. Setting the lowest end of the annular bottom wall not higher than the bottom wall of the liquid outlet flow channel can avoid the formation of a dead angle that cannot be flushed by the fluid at the connection between the liquid outlet flow channel and the annular bottom wall when the lowest end of the annular bottom wall is higher than the bottom wall of the liquid outlet flow channel.

[0018] The features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and drawings. Brief Description of the Drawings

[0019] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0020] Figure 1 It is a cross-sectional view of the whole valve body in Embodiment 1;

[0021] Figure 2 It is a schematic perspective view of the inclined three-dimensional structure of the base part in the valve body in Embodiment 1;

[0022] Figure 3 It is a schematic perspective view of the vertical section of the base part in the valve body in Embodiment 1

[0023] Figure 4 It is a schematic top view of the base part in the valve body in Embodiment 1;

[0024] Figure 5 It is a diagram for explaining the slope at any point P on the annular bottom wall in Embodiment 1;

[0025] Figure 6 It is a schematic perspective view of the horizontal section of the base part in the valve body in Embodiment 1;

[0026] Figure 7 It is a schematic perspective view of the partial section of the base part in the valve body in Embodiment 2;

[0027] Figure 8 For Figure 7 Schematic side view;

[0028] Figure 9 It is a schematic side view of the partial section of the base part of the valve body in Embodiment 3;

[0029] Figure 10 It is a schematic perspective view of the horizontal section of the base part in the valve body in Embodiment 4;

[0030] Figure 11 It is a top view structural schematic diagram of the base part in the valve body in the fourth embodiment;

[0031] Figure 12 It is a cross-sectional view of the valve body in the prior art;

[0032] Figure 13 It is a top view of the fluid velocity analysis on the inner wall of the valve cavity in the prior art.

[0033] Reference numerals:

[0034] 100, valve body; 110, liquid inlet channel; 120, liquid outlet channel; 130, base; 140, cover body;

[0035] 200, valve cavity; 210, annular bottom wall; 211, highest point; 212, lowest point; 213, guide wall; 2131, steep section;

[0036] 300, valve seat; 310, protruding wall; 320, connecting channel;

[0037] 400, valve assembly. Specific embodiments

[0038] A valve body proposed by the present utility model includes: a valve main body having an inlet fluid passage and an outlet fluid passage for fluid inlet and outlet; a valve cavity provided inside the valve main body, the valve cavity communicating with the outlet fluid passage; a valve seat provided in the valve cavity and including a protruding wall and a communicating passage inside the protruding wall, the communicating passage being used to communicate the valve cavity with the inlet fluid passage, the valve cavity having an annular bottom wall surrounding the outside of the valve seat; a valve assembly mounted on the valve main body and extending into the valve cavity to cooperate with the valve seat to open and close the valve body; the annular bottom wall is inclined downward towards the outlet fluid passage and has a highest point and a lowest point, and two diversion walls are formed between the highest point and the lowest point of the annular bottom wall; wherein, among the diversion walls, there is a steep section near the highest point, and the slope of the steep section is K1; the vertical height difference between the highest point and the lowest point is H, and the horizontal distance is L, where K1 > H / L. By inclining the annular bottom wall in the present utility model, when the valve body is opened, the fluid flows into the communicating passage through the inlet fluid passage and then enters the valve cavity. Because the annular bottom wall is inclined, the fluid flows along the two diversion walls from the highest point to the lowest point respectively and finally flows out of the valve body through the outlet fluid passage. Among them, the flow velocity of the fluid at the highest point can be increased, and it is avoided that the flow velocity of the fluid at the highest point is too slow, resulting in the settlement and accumulation of impurities or crystals. Further, by setting a section of the diversion wall near the highest point as a steep section and setting the slope of the steep section to be greater than the slope of the line connecting the highest point and the lowest point, the slope of the bottom wall of the valve cavity near the highest point is greater. The steep section can further increase the flow velocity of the fluid at the highest point, so that the fluid at the highest point can quickly leave from the highest point to avoid the formation of a flow dead zone due to the slow flow of the fluid at the highest point. According to the principle of the brachistochrone curve, by setting the diversion wall into a structure with a steep section, compared with the diversion wall with a constant slope, the flow velocity of the liquid in the valve cavity is faster, and the faster-flowing fluid can also scour the lowest point of the diversion wall to avoid the formation of a flow dead zone due to the slow flow of the fluid at the lowest point, thereby avoiding the deposition of impurities at the highest point or the lowest point of the fluid and polluting the subsequent fluid.

[0039] The technical solutions of the embodiments of the present utility model will be explained and described below with reference to the accompanying drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present utility model.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0042] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0044] Embodiment 1:

[0045] A valve body, such as Figures 1 to 6As shown, it includes a valve body 100 and a valve assembly 400. The valve body 100 is provided with an inlet flow channel 110 and an outlet flow channel 120 for fluid to flow in and out. The valve body 100 is also provided with a valve cavity 200 and a valve seat 300. The valve cavity 200 is arranged inside the valve body 100 and communicates with the outlet flow channel 120. The valve seat 300 is arranged in the valve cavity 200. The valve seat 300 includes a protruding wall 310 and a communication flow channel 320 located inside the protruding wall 310. The communication flow channel 320 is used to connect the valve cavity 200 and the inlet flow channel 110. The valve assembly 400 is installed on the valve body 100, and its end extends into the valve cavity 200 to close or open the communication flow channel 320 by abutting against or moving away from the valve seat 300, thereby realizing the opening and closing of the valve body. The valve body 100 includes a base 130 and a cover 140. The inlet flow channel 110, the outlet flow channel 120, and the valve seat 300 are all arranged in the base 130, and the valve cavity 200 is formed between the base 130 and the cover 140.

[0046] As Figure 4 shown, the bottom of the valve cavity 200 is provided with an annular bottom wall 210. The annular bottom wall 210 is arranged around the outside of the valve seat 300. As Figure 3 shown, the height of the annular bottom wall 210 gradually decreases from the end far away from the outlet flow channel 120 to the end close to the outlet flow channel 120, that is, the annular bottom wall 210 is inclined towards the outlet flow channel 120. The annular bottom wall 210 has a highest point 211 and a lowest point 212. Between the highest point 211 and the lowest point 212, two diversion walls 213 are formed. One ends of the two diversion walls 213 are connected, and the other ends respectively bypass both sides of the valve seat 300 and finally converge. Refer to Figure 6 , at this time, the annular bottom wall 210 is symmetrically arranged with respect to the first reference plane M. Of course, at this time, as Figure 6 shown, the annular bottom wall 210 only has a highest point 211. In other embodiments, the top end of the annular bottom wall 210 can also be set as a platform structure, that is, any point on this platform is the highest point 211. At the same time, the bottom end of the annular bottom wall 210 can also be set as a platform structure, and any point on the platform structure at the bottom end is the lowest point 212. Of course, preferably, as Figure 6 shown, only one highest point 211 is provided on the annular bottom wall 210 to avoid the platform structure causing the liquid to flow smoothly.

[0047] In the present utility model, by obliquely arranging the annular bottom wall 210, when the valve body is opened, fluid flows into the communication flow channel 320 through the liquid inlet flow channel 110, and then enters the valve cavity 200. Because the annular bottom wall 210 is obliquely arranged, the fluid flows along the two diversion walls 213 from the highest point 211 to the lowest point 212 respectively, and finally flows out of the valve body through the liquid outlet flow channel 120. That is to say, the flow velocity of the fluid at the highest point 211 can be increased to avoid the situation that the flow velocity at the highest point 211 is too slow, resulting in sedimentation and accumulation of impurities and crystallization at the highest point 211 and the nearby areas.

[0048] As Figure 1 shown, the height difference between the highest point 211 and the lowest point 212 in the vertical direction is H, and the distance between the highest point 211 and the lowest point 212 in the horizontal direction is specified as L. Specifically: in the projections of the highest point 211 and the lowest point 212 on the first reference plane M, the distance between the highest point 211 and the lowest point 212 in the vertical direction is H, and the distance between the highest point 211 and the lowest point 212 in the horizontal direction is L. From as Figure 3 shown, the X direction is to the horizontal direction, and the Z direction is the vertical direction.

[0049] Referring to Figure 1 and Figure 3 , both diversion walls 213 have a steep section 2131. The steep section 2131 is a section of the diversion wall 213 close to the highest point 211. The slope of the steep section 2131 is specified as K1, where K1 > H / L is satisfied, that is, the slope of the steep section 2131 is greater than the slope of the line connecting the highest point 211 and the lowest point 212.

[0050] In the above structure, by setting a section of the diversion wall 213 close to the highest point 211 as the steep section 2131 and setting the slope of the steep section 2131 to be greater than the slope of the line connecting the highest point 211 and the lowest point 212, the slope of the bottom wall of the valve cavity 200 near the highest point 211 is made larger. The steep section 2131 can further accelerate the flow velocity of the fluid at the highest point 211, so that the fluid at the highest point 211 can quickly leave from the highest point 211 to avoid the formation of a flow dead zone due to the slow flow of the fluid at the highest point 211. According to the principle of the brachistochrone curve, by setting the diversion wall 213 into a structure with a steep section 2131, compared with the diversion wall 213 with a constant slope, the flow velocity of the fluid in the valve cavity 200 is faster. The faster flowing fluid can also scour the lowest point 212 of the diversion wall 213 to avoid the formation of a flow dead zone due to the slow flow of the fluid at the lowest point 212, and further avoid the deposition of impurities at the highest point 211 or the lowest point 212 and the pollution of the subsequent fluid.

[0051] Now, the slope of any point on the steep section 2131 or the annular bottom wall 210 will be described:

[0052] Refer to Figure 5 a. Take any point P on the steep section 2131 or the annular bottom wall 210. Take the vertical plane passing through the central axis of the liquid outlet channel 120 as the first reference plane M, and the second reference plane N passing through point P is parallel to or coincides with the first reference plane M;

[0053] Refer to Figure 5 b. The second reference plane N has a cross-section of the valve body 100, and the wall surface of the steep section 2131 or the annular bottom wall 210 has a cross-line containing point P in this cross-section;

[0054] Refer to Figure 5 c. In this cross-section, there is a slope k at point P, and this slope k is used as the slope of the steep section 2131 or the annular bottom wall 210 at this point P. When the point P is located on the steep section 2131, the slope of the point P at this time is the aforementioned slope K1.

[0055] In this embodiment, the slope of the diversion wall 213 changes. Among the two places with different heights of the diversion wall 213, the slope at the relatively lower height is not greater than the slope at the relatively higher height, and the slope is the largest near the highest point 211 of the diversion wall 213, so as to ensure that the liquid can flow smoothly from top to bottom along the diversion wall 213, avoid the formation of steps or dead corners that cannot be flushed due to the increase in the slope in the middle of the diversion wall 213, and also avoid the formation of flow dead zones on the side of the diversion wall 213.

[0056] Preferably in this embodiment, the diversion wall 213 is a curved surface structure, and the slope of the diversion wall 213 gradually decreases from the highest point 211 to the lowest point 212, so that the diversion wall 213 is a smooth curved surface, as Figure 1 shown, the setting that the top contour line of the annular bottom wall 210 is a curved surface can, while avoiding the dead zone formed at the highest point 211 of the diversion wall 213, greatly increase the flow velocity of the fluid, and thus greatly shorten the time for the fluid to flow through the diversion wall 213, improve the flow rate of the valve body per unit time, avoid the deposition of impurities in the valve cavity 200, and improve the user experience.

[0057] In this embodiment, refer to Figure 1 , the connecting channel 320 extends vertically upward, one side of its lower end is connected to the liquid inlet channel 110, and its upper end is connected to the valve cavity 200. Preferably, the diameter of the upper end of the connecting channel 320 gradually increases from bottom to top, so that the fluid in the liquid inlet channel 110 can be more dispersed when entering the valve cavity 200 through the connecting channel 320, ensuring the full flow of the liquid in the valve cavity 200, avoiding the fluid concentrating in some areas of the valve cavity 200 when it first enters the valve cavity 200, especially avoiding the fluid concentrating on the side of the valve cavity 200 close to the liquid outlet channel 120 resulting in a decrease in flow velocity, and ensuring the smooth flow of the fluid between the valve cavity 200 and the liquid outlet channel 120.

[0058] In this embodiment, a groove is formed between the annular bottom wall 210 and the protruding wall 310. Through the groove, even when the inclination angle of the annular bottom wall 210 is relatively large, a small included angle will not be formed between the annular bottom wall 210 and the outside of the protruding wall 310, avoiding the accumulation of impurities and crystals at this included angle.

[0059] Furthermore, the height of the top end of the valve seat 300 can be made higher than the highest point 211 of the annular bottom wall 210 of the valve cavity 200, that is, the top of the protruding wall 310 is higher than the highest point 211 of the annular bottom wall 210, so that there is a certain height difference in the height direction between the liquid outlet end of the communication flow channel 320 and the highest point 211 of the annular bottom wall 210. When the fluid flows from the liquid outlet end of the communication flow channel 320 to the highest point 211 of the annular bottom wall 210, the height difference between the two causes the fluid to generate a relatively large flow velocity under the action of gravity, and further enables the fluid to quickly pass through the highest point 211 of the annular bottom wall 210 and form a scouring effect on it, further avoiding the formation of a flow dead zone at the highest point 211 of the annular bottom wall 210.

[0060] It should be noted that in the present utility model, the formation of a flow dead zone at the highest point 211 or the lowest point 212, or the accumulation of impurities and crystals on the wall surface at the highest point 211 or the lowest point 212, all refer to the occurrence of such a situation at the highest point 211 or the lowest point 212 and its vicinity.

[0061] Of course, it can be understood that the height of the top end of the valve seat 300 in this embodiment can also be lower than the highest point 211 of the annular bottom wall 210, that is, the top of the protruding wall 310 is lower than the highest point 211 of the annular bottom wall 210. At this time, the groove between the outer side wall of the protruding wall 310 and the annular bottom wall 210 can be an annular groove.

[0062] If the lowest point 212 of the annular bottom wall 210 is higher than the bottom wall of the liquid outlet flow channel 120, a dead angle that cannot be scoured by the fluid will be formed at the connection between the liquid outlet flow channel 120 and the annular bottom wall 210. Therefore, in this embodiment, the lowest point 212 of the annular bottom wall 210 is not set higher than the bottom wall of the liquid outlet flow channel 120, that is, the height at the connection between the annular bottom wall 210 and the liquid outlet flow channel 120 is equal to the height of the bottom wall of the liquid outlet flow channel 120. Preferably, the annular bottom wall 210 is tangent to the bottom wall of the liquid outlet flow channel 120 to make the fluid flow more smoothly. Or, the lowest point 212 of the annular bottom wall 210 is set lower than the bottom wall of the liquid outlet flow channel 120, and it can also avoid the formation of a dead angle at the lowest point 212 of the annular bottom wall 210 through the scouring of the fluid.

[0063] Embodiment 2:

[0064] The difference between this embodiment and Embodiment 1 is that in this embodiment, the guiding wall 213 includes a plurality of (two or more) connected guiding surfaces.

[0065] As shown in Figure 7 and Figure 8 the figure, the flow guiding wall 213 is composed of multiple (two or more) connected flow guiding surfaces. The flow guiding surface closest to the highest point 211 is the steep section 2131. Each flow guiding surface is an inclined plane with a fixed slope, and the slopes of each flow guiding surface are different. Among two adjacent flow guiding surfaces, the slope of the flow guiding surface relatively closer to the liquid outlet channel 120 is smaller than that of the flow guiding surface farther from the liquid outlet channel 120. That is, the slopes of each flow guiding surface gradually decrease from the highest flow guiding surface to the lowest flow guiding surface, which is convenient for the fluid to flow smoothly on the flow guiding wall 213. At the same time, the arrangement of multiple inclined planes is convenient for production and processing.

[0066] As shown in Figure 7 the figure, it is preferable to adopt a smooth transition connection between two adjacent flow guiding surfaces to avoid forming dead corners at the connection of two adjacent flow guiding surfaces and ensure the smooth flow of the fluid on the flow guiding wall 213.

[0067] Embodiment Three:

[0068] The difference between this embodiment and Embodiment Two is that this embodiment uses a curved surface with a changing slope to replace one or more inclined planes with a fixed slope in Embodiment Two, so that among the multiple flow guiding surfaces in this embodiment, there are both inclined planes with a fixed slope and curved surfaces with a changing slope. The slope of each curved surface gradually decreases as the height decreases. As shown in Figure 9 the figure, the projection of the flow guiding wall 213 on the first reference plane M is a combination of connected straight lines and curves. When the fluid flows on the flow guiding surface, its flow velocity will change, avoiding the fluid flowing down at a constant speed. Furthermore, the fluid pressures of the two flow guiding walls 213 flowing to the lowest point 212 are different, avoiding the generation of a flow dead zone due to pressure balance near the lowest point 212 of the annular bottom wall 210.

[0069] As shown in Figure 9 d, the upper side is a curved surface and the lower side is an inclined plane with a fixed slope, or as shown in Figure 9 e, the upper side is an inclined plane with a fixed slope and the lower side is a curved surface.

[0070] Embodiment Four

[0071] The difference from any one of Embodiments One to Three is that the two flow guiding walls 213 are asymmetrically arranged with respect to the first reference plane M.

[0072] As shown in Figure 10As shown, the highest point 211 and / or the lowest point 212 are located on one side of the first reference plane M. By setting the highest point 211 and / or the lowest point 212 to be biased towards one side of the first reference plane, the two-sided structures of the part of the annular bottom wall 210 penetrated by the first reference plane M are made asymmetric. And through the asymmetric structure, the flow state of the liquid at the annular bottom wall 210 is further optimized to avoid the formation of a flow dead zone at the annular bottom wall 210. For example, ensure that the pressures of the fluids on both sides are unbalanced, and through the unbalanced pressures, a certain pressure difference is formed between the two sides. And through the pressure difference, the liquid in the part penetrated by the first reference plane and its vicinity can flow faster, avoiding the situation where the liquid flow rate is too slow and impurities or crystal sedimentation accumulates.

[0073] Or, as Figure 11 shown, the connecting flow channel 320 is symmetrically arranged with respect to the first reference plane M, but the protruding wall 310 is asymmetrically arranged with respect to the first reference plane M, so that the widths of the annular bottom wall 210 on both sides of the first reference plane are different. And at this time, after the liquid enters the valve cavity 200 from the connecting flow channel 320, the pressures on both sides of the first reference plane M will be different. Furthermore, the structure symmetric with respect to the annular bottom wall 210 can destroy the pressure balance of the fluid thereon, so that the fluid at each part of the annular bottom wall 210 can have a certain flow rate, avoiding the accumulation of impurities or crystal sedimentation due to too slow fluid flow rate.

[0074] Or, the connecting flow channel 320 is symmetrically arranged with respect to the first reference plane M, but the protruding wall 310 is asymmetrically arranged with respect to the first reference plane M, and the highest point 211 and / or the lowest point 212 are located on one side of the first reference plane M to better destroy the pressure balance.

[0075] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches should also be regarded as within the protection scope of the present invention.

Claims

1. A valve body, comprising: A valve main body having an inlet liquid flow passage and an outlet liquid flow passage for flowing in and out of a fluid; A valve cavity provided inside the valve main body, the valve cavity communicating with the outlet liquid flow passage; A valve seat provided in the valve cavity and including a protruding wall and a communicating flow passage inside the protruding wall, the communicating flow passage being used to communicate the valve cavity with the inlet liquid flow passage, the valve cavity having an annular bottom wall surrounding the outside of the valve seat; A valve assembly mounted on the valve main body and extending into the valve cavity to cooperate with the valve seat to open and close the valve body; Characterized in that The annular bottom wall is inclined downward toward the outlet liquid flow passage and has a highest point and a lowest point, and two guiding walls are formed between the highest point and the lowest point of the annular bottom wall; Wherein, among the guiding walls, there is a steep section near the highest point, and the slope of the steep section is K1; The vertical height difference between the highest point and the lowest point is H, and the horizontal distance is L, wherein K1 > H / L.

2. The valve body according to claim 1, wherein: Among the two places with different heights of the guiding walls, the slope of the relatively lower height place is not greater than the slope of the relatively higher height place.

3. The valve body according to claim 2, wherein: The guiding wall is a curved surface structure, and the slope of the guiding wall gradually decreases from the highest point to the lowest point.

4. The valve body according to claim 1 or 2, characterized in that: The guiding wall includes at least two connected guiding surfaces, and the guiding surface closest to the highest point is the steep section; Among adjacent guiding surfaces, the slope of the guiding surface relatively closer to the outlet liquid flow passage is smaller than the slope of the guiding surface farther from the outlet liquid flow passage.

5. The valve body according to claim 4, characterized in that: At least two guiding surfaces are all inclined surface structures with a fixed slope; Or, at least two guiding surfaces include an inclined surface with a fixed slope and a curved surface, and in the curved surface structure, the slope decreases as the height decreases.

6. The valve body according to claim 4, characterized in that: A smooth transition connection is provided between adjacent guiding surfaces.

7. The valve body according to claim 1, characterized in that: Taking the vertical plane passing through the central axis of the outlet liquid flow passage as the first reference plane, the two guiding walls are asymmetrically arranged with respect to the first reference plane.

8. The valve body according to claim 1, characterized in that: The diameter of the end of the communicating flow passage communicating with the valve cavity increases upward.

9. The valve body according to claim 1, wherein: There is a groove between the outer side wall of the protruding wall and the annular bottom wall.

10. The valve body according to claim 1, characterized in that: The height of the connection between the annular bottom wall and the outlet liquid flow passage is equal to the height of the bottom wall of the outlet liquid flow passage, or the lowest end of the annular bottom wall is lower than the bottom wall of the outlet liquid flow passage.

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