Control valve

Abstract

The control valve comprises a valve body part, a switch part and a valve element part, the valve body part comprises a connecting sleeve and a main valve body, the connecting sleeve is made of stainless steel, the main valve body is made of stainless steel, the connecting sleeve and the main valve body are welded and fixed, the main valve body comprises a main valve port, the valve element part is located in an inner cavity of the valve body part, and the valve element part comprises a valve element. The valve element comprises an auxiliary valve port. The switch component comprises a valve rod, the valve rod can open or close the auxiliary valve port, and the valve rod is matched with the valve element to open or close the main valve port. The connecting sleeve is cylindrical and comprises a first radial inner convex section, the valve rod comprises a first radial outer convex section, in the axial direction of the connecting sleeve, the first radial outer convex section is located below the first radial inner convex section, the valve rod is in threaded connection with the connecting sleeve, and the first radial inner convex section limits the upward moving stroke of the valve rod relative to the connecting sleeve; the control valve is low in cost, and limiting reliability of the valve rod of the control valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a control valve. Background Art

[0002] Figure 8 The figure shows a schematic diagram of the structure of a control valve of the background technology. Figure 8 As shown, the control valve includes a valve body 01, and the valve body component 01 includes a main body 010 formed by a brass casting. The valve stem 03 is located in the main valve body 010, and the valve stem 03 is threadedly connected to the main valve body 010. The retaining spring 02 is engaged with the retaining groove 011 on the inner wall of the main valve body 010 to limit the valve stem 03 from slipping out of the main valve body 010, thereby preventing the valve stem from slipping out and limiting the position. For the control valve of this structure, the main valve body 010 is expensive, and the retaining spring 02 also has the risk of slipping out and failing under fluid pressure impact, resulting in insufficient limiting reliability of the valve stem. Summary of the invention

[0003] The object of the present invention is to provide a control valve. The control valve provided by the present invention comprises a valve body component, a switch component and a valve core component. The valve body component comprises a connecting sleeve and a main valve body. The connecting sleeve is made of stainless steel. The main valve body is made of stainless steel. The connecting sleeve is welded and fixed to the main valve body. The main valve body comprises a main valve port. The valve core component is located in the inner cavity of the valve body component. The valve core component comprises a valve core. The valve core comprises an auxiliary valve port. The switch component comprises a valve stem. The valve stem can open or close the auxiliary valve port. The valve stem cooperates with the valve core to open or close the main valve port.

[0004] The connecting sleeve is cylindrical, and the connecting sleeve includes a first radial inward convex section. The valve stem includes a first radial outward convex section. In the axial direction of the connecting sleeve, the first radial outward convex section is located below the first radial inward convex section. The valve stem is threadedly connected to the connecting sleeve, and the first radial inward convex section limits the upward movement of the valve stem relative to the connecting sleeve.

[0005] The control valve of the above scheme, the valve body component includes a connecting sleeve and a main valve body, the connecting sleeve is made of stainless steel, the main valve body is made of stainless steel, the connecting sleeve is welded and fixed to the main valve body, the inner wall of the connecting sleeve includes a first radial inward convex section, the valve stem includes a first radial outward convex section, the first radial outward convex section is located below the first radial inward convex section, the first radial inward convex section limits the upward movement of the valve stem relative to the connecting sleeve, the material cost of the control valve is low and the limiting reliability of the valve stem of the control valve is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the structure of the control valve of the present application in the first working mode according to the first embodiment;

[0007] Figure 1A Shown Figure 1 Schematic diagram of the structure of the middle valve cap, switch component and connecting sleeve;

[0008] Figure 1B Shown Figure 1 A schematic structural diagram of a housing of the control valve shown;

[0009] Figure 2 It is a schematic diagram of the structure of the control valve in the second working mode shown in the first embodiment of the present application;

[0010] Figure 3 It is a schematic diagram of the structure of the control valve in the third working mode shown in the first embodiment of the present application;

[0011] Figure 4 Shown Figure 1 A three-dimensional schematic diagram of a valve core of the control valve shown;

[0012] Figure 5 Shown Figure 4 A schematic cross-sectional view of the valve core shown;

[0013] Figure 6 The figure shows the structure diagram of the second embodiment of the control valve of the present application;

[0014] Figure 7 The figure shows the structure diagram of the third embodiment of the control valve of the present application;

[0015] Figure 8 Shown is a structural schematic diagram of a control valve in the background technology. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings.

[0017] Herein, the forward direction is defined as the flow of fluid from the second inlet and outlet B to the first inlet and outlet A, and the reverse direction is defined as the flow of fluid from the first inlet and outlet A to the second inlet and outlet B.

[0018] The control valve of the present application has a throttling function when the fluid flows in in the forward direction, and can realize a throttling function or a cut-off function when the fluid flows in in the reverse direction.

[0019] It should be noted that the “made of stainless steel material” in this article does not include the copper layer or copper sleeve mentioned in the article for the convenience of welding with external parts.

[0020] like Figure 1-3 As shown, the control valve includes a valve body component 1, a switch component 2 and a valve core component 3.

[0021] The valve body component 1 includes a main valve body 11 and a connecting sleeve 12. The main valve body 11 includes a shell 111 and a seat 112. The shell 111 is a circular tubular structure made of stainless steel. In this embodiment, it is specifically a tube made of stainless steel. One end of the shell 111 is formed by a flaring process to form a first inlet and outlet A for fluid to enter or flow out. An annular protrusion 1110 is drawn out on its side wall by a drawing hole process. One end of the annular protrusion 1110 serves as a first interface B1.

[0022] The seat body 112 is made of a stainless steel plate by stamping. The seat body 112 is located in the shell 111. The seat body 112 is welded and fixed to the shell 111. The two can be furnace welded or laser welded. A main valve port 1120 is formed on the seat body 112. Specifically, the seat body 112 includes a circular plate portion 1121 and an annular portion 1122. The plate portion 1121 has an axial through hole, which serves as the main valve port 1120. The annular portion 1122 extends from the outer edge of the plate portion 1121 in a direction away from the valve core 31 described below. The outer wall of the annular portion 1122 is interference-fitted with the inner wall of the shell 111 and is welded and fixed.

[0023] like Figure 1 and Figure 1B As shown, the housing 111 includes a first straight cylinder portion 1111, a first cone ring portion 1112, a second straight cylinder portion 1113, a second cone ring portion 1114, and a third straight cylinder portion 1115. The seat body 112 is located in the first straight cylinder portion 1111, the first cone ring portion 1112 connects the first straight cylinder portion 1111 and the second straight cylinder portion 1113, the inner diameter of the first straight cylinder portion 1111 is greater than the inner diameter of the second lower cylinder portion 1113, and the inner diameter of one end of the first cone ring portion 1112 connected to the first straight cylinder portion 1111 is greater than the inner diameter of one end of the first cone ring portion 1112 connected to the second straight cylinder portion 1113. Thus, the first cone ring portion 1112 can play an axial pre-positioning role on the seat body 112 during assembly. The second cone ring portion 1114 connects the second straight cylinder portion 1113 and the third straight cylinder portion 1115. The inner diameter of the third straight tube portion 1115 is greater than the inner diameter of the second straight tube portion 1113, and the inner diameter of the end of the second cone ring portion 1114 connected to the second straight tube portion 1113 is greater than the inner diameter of the end of the second cone ring portion connected to the third straight tube portion 1115. That is, the third straight tube portion 1115 is flared, and the processing method of the above-mentioned shell 111 can be a tube made of stainless steel material with the same diameter as the second straight tube portion 1113, stretched / flared on both sides, or formed by a stainless steel tube with the same diameter as the first straight tube portion 1111 through shrinking, stretching, and flaring processes.

[0024] In the above solution, the shell 111 and the seat 112 not only meet the lead-free material requirements, but also have low material cost and convenient processing compared to the background technology. The seat 112 is welded in the shell 111 without increasing the external welding points of the control valve.

[0025] The connecting sleeve 12 is also made of stainless steel. In this embodiment, the connecting sleeve 12 is specifically a machined part. The connecting sleeve 12 is specifically cylindrical and is welded and fixed to the end of the first straight tube portion 1111 away from the first inlet and outlet A. The two can be fixed by laser welding.

[0026] like Figure 2 As shown, the valve body component 1 also includes a joint 13. The joint 13 is also made of stainless steel material. The joint 13 is an axially through cylindrical structure. The joint 13 includes a through hole 131, and the through hole 131 is connected to the inner cavity of the housing 111. One end of the joint 13 extends from the annular protrusion 1110 into the housing 111, and the outer wall of the joint 13 is welded and fixed to the annular protrusion 1110. The end of the joint 13 away from the housing 111 forms a second inlet and outlet B (i.e., the end of the through hole 131 away from the housing 111) for fluid to enter or flow out.

[0027] It should be noted that, in the embodiments described herein, the connector 13 may not be provided, and the first interface B1 may be directly used as the second inlet and outlet B.

[0028] like Figure 1 As shown, the control valve further includes a first filter element 4 . The first filter element 4 is at least partially located in the annular portion 1122 of the seat body 112 . The first filter element 4 is fixed to the seat body 112 by welding.

[0029] The first filter element 4 is used to filter the fluid entering from the first inlet and outlet A.

[0030] The first filter element 4 is also made of stainless steel.

[0031] like Figure 1-3 As shown, the valve stem 21 is threadedly connected to the connecting sleeve 12, and the valve stem 21 can rotate threadedly and move axially relative to the connecting sleeve 12, wherein the connecting sleeve 12 has an internal thread and an external thread, and the first valve bonnet 5 of the control valve is outermostly arranged on the connecting sleeve 12, the first valve bonnet 5 has an internal thread, and the first valve bonnet 5 is threadedly connected to the external thread of the connecting sleeve 12.

[0032] The switch component 2 includes a valve stem 21, which includes an external thread. The valve stem 21 is at least partially located in the connecting sleeve 12. The valve stem 21 is threadedly connected to the connecting sleeve 12. The valve stem 21 can be axially displaced relative to the connecting sleeve 12, i.e., the longitudinal displacement of the control valve, under the action of external force.

[0033] like Figure 1-3As shown, the outer wall of the connecting sleeve 12 includes a first external thread section 121, a first insertion section 122 and a second radially outwardly protruding section 123. The first external thread portion 121 has an external thread. The second radially outwardly protruding section 123 is located between the first external thread section 121 and the first insertion section 122. The second radially outwardly protruding section 123 radially protrudes outward relative to the root of the first external thread section 121 and the first insertion section 122. The first insertion section 122 is inserted into the housing 111. In the longitudinal direction of the control valve, the second radially outwardly protruding section 123 abuts against the upper end of the housing 111. The outer wall of the first insertion section 122 is interference fit with the inner wall of the housing 111. The upper end of the housing 111 is welded and fixed to the connecting sleeve 12. At least one of the first insertion section 122 and the second radially outwardly protruding section 123 is welded and fixed to the housing 111. The design of the first insertion section 122 and the second radially outwardly protruding section 123 facilitates the radial positioning and axial positioning of the connecting sleeve 12 and the housing 111.

[0034] like Figure 1 As shown, the connecting sleeve 12 is made by lathing a stainless steel bar. The connecting sleeve 12 includes a first internal thread section 124, a first radially inwardly convex section 125, and a first guide section 126. The first internal thread section 124 has an internal thread, and the first radially inwardly convex section 125 radially protrudes inward relative to the root of the first internal thread section 124 and the first guide section 126. The inner diameter of the first guide section 126 is greater than the inner diameter of the first radially inwardly convex section 125, and the first guide section 126 can guide the switch component 2.

[0035] The valve stem 21 includes a second external thread section 211, a first radially outwardly protruding section 212, a third radially outwardly protruding section 213, a seal installation section 214, and a valve stem guide section 215. The seal installation section 214 is cylindrical, and the seal 22 is sleeved on the seal installation section 214. The seal 22 abuts against the outer wall of the seal installation section 214 and the inner wall of the first guide section 126 of the connecting sleeve 12. The outer wall of the first radially outwardly protruding section 212 and the outer wall of the third radially outwardly protruding section 213 protrude radially outward relative to the outer wall of the seal installation section 214. In the longitudinal direction of the control valve, the first radially outwardly protruding section 212 and the third radially outwardly protruding section 213 limit the seal 22 axially.

[0036] The first radially inner convex section 125 of the connecting sleeve 12 cooperates with the first radially outer convex section 212 of the valve stem 21, so that the switch component 2 will not fall out from the upper end of the connecting sleeve 12 in the longitudinal direction of the control valve. That is, the first radially inner convex section 125 has a travel for limiting the upward movement of the switch component 2 in the axial direction of the connecting sleeve 12, and limits its axial upward anti-falling, and the valve stem 21 can be anti-falling limited without adding parts, and the valve stem 21 can be prevented from rushing out of the valve body component due to the impact of fluid pressure, and the limiting is reliable. Compared with the background technology, the reliability of the limiting of the valve stem of the control valve can be improved, that is, the reliability of the control valve is improved.

[0037] The valve stem 21 is installed from the lower end of the connecting sleeve 12, and the connecting sleeve 12 does not need to be separately provided with a part to prevent the valve stem 21 from being separated from the connecting sleeve 12, thereby reducing the number of parts and simplifying the assembly process. Specifically in this embodiment, the cross-sections of the first radially inner convex section 125 and the first radially outer convex section 212 are both circular, and the outer diameter of the first radially outer convex section 212 is greater than the inner diameter of the first radially inner convex section 125.

[0038] The cross section of the third radial outward protrusion section 213 is also circular. The outer diameters of the first radial outward protrusion section 212 and the third radial outward protrusion section 213 may be equal or unequal. In this embodiment, as a preferred solution, the outer diameters of the two are equal to facilitate processing.

[0039] The first radial outward protrusion 212, the third radial outward protrusion 213 and the seal 22 are located in the connecting sleeve 12. The first radial outward protrusion 212, the third radial outward protrusion 213 and the seal 22 are slidably matched with the first guide section 126 of the connecting sleeve 12, and the seal 22 is dynamically sealed with the first guide section 126.

[0040] The valve stem guide section 215 is located at the lower side of the third radial outward protrusion section 213. In the present embodiment, the valve stem guide section 215 is specifically cylindrical. Of course, the shape of the valve stem guide section 215 is not limited to cylindrical, as long as it can adapt to the valve core component 3 to realize its function.

[0041] The valve stem guide section 215 is provided with a valve core component 3. In this embodiment, the valve core component 3 is specifically a valve core 31, which is made of a non-metallic material. The valve core 31 is selected from a material with high efficiency sealing and excellent temperature resistance. The valve core 31 can be made of a polymer material such as polytetrafluoroethylene with good creep resistance. The valve stem 21 is made of stainless steel. The valve core 31 includes a secondary valve port 30, and the valve stem 21 can open or close the secondary valve port 30.

[0042] Specifically, Figure 1-3 and Figure 4 and Figure 5 As shown, in this embodiment, the valve core 31 is cylindrical as a whole. Of course, its structure is not limited to this, as long as it can cooperate with the valve stem 21 to achieve its function. The valve core 31 is an axial through structure, and the valve core 31 includes an axially through large-diameter section 311 and an axially through small-diameter section 312. The flow area of ​​the large-diameter section 311 is larger than the flow area of ​​the small-diameter section 312. In this embodiment, the cross-sections of the inner holes of the large-diameter section 311 and the small-diameter section 312 are both circular, and the inner diameter of the large-diameter section 311 is larger than the inner diameter of the small-diameter section 312. The part below the large-diameter section 311 is the small-diameter section 312.

[0043] The valve stem guide section 215 is at least partially located in the large-diameter section 311 and can be slidably matched with the large-diameter section 311, and the valve stem guide section 215 can guide the sliding of the valve core 31. In the longitudinal direction of the control valve, the projection of the outer edge of the large-diameter section 311 of the valve core 31 is located in the projection of the inner wall of the first guide section 126 of the connecting sleeve 12, so that when the control valve is in the first working mode, at least part of the large-diameter section 311 of the valve core 31 can be located in the first guide section 126, which is conducive to the rational use of space and the reduction of the longitudinal size of the control valve. In addition, in the process of switching from the second working mode or the third working mode described below to the first working mode, the first guide section 126 of the connecting sleeve 12 can further guide the axial movement of the valve core 31, that is, starting from the upper end of the valve core 31 sliding into the first guide section 126, the inner side of the valve core 31 is guided by the valve stem guide section 215, and the outer side of the valve core 31 is also guided by the first guide section 126 of the connecting sleeve 12. The valve core 31 is well guided, and during its axial displacement, the valve core 31 does not deflect in the axial direction, thereby improving the operation reliability of the valve core 31 and preventing it from getting stuck.

[0044] like Figure 4 and Figure 5 As shown, the side wall portion of the large aperture section 311 includes a communication channel. When the valve stem 21 opens the auxiliary valve port 30, the communication channel can be communicated with the auxiliary valve port 30. Specifically, in this embodiment, the communication channel is a through hole provided on the side wall portion of the large aperture section 311, and the communication channel communicates with the side wall and the outer wall of the large aperture section 311. In this embodiment, the communication channel includes a first communication channel 3111 and a second communication channel 3112. The first communication channel 3111 and the second communication channel 3112 are radially connected on the large aperture section 311, which is convenient for processing. The small aperture section 312 of the valve core 31 has the aforementioned auxiliary valve port 30. The valve stem 21 includes a sealing section 216 that can open or close the auxiliary valve port 30. In this embodiment, the sealing section 216 is located at the lower side of the valve stem guide section 215. Of course, it can be understood that the lower end of the valve stem guide section 215 can also be directly used as the sealing section.

[0045] like Figure 2 As shown, the control valve further includes a second filter element 6, which is located in the valve body component 1. In this embodiment, the second filter element 6 is located in the inner cavity of the housing 111, and the second filter element 6 is welded and fixed to one end of the connector 13 close to the valve core 31. The function of the second filter element 6 is to filter the fluid entering from the second inlet and outlet B. The second filter element 6 is also made of stainless steel.

[0046] The control valve of this application can realize the following three working modes:

[0047] The first working mode:

[0048] like Figure 1 , which shows a schematic diagram of the structure of the control valve of the first embodiment in the first working mode. The valve stem 21 is in a first relative position relative to the connecting sleeve 12, and the fluid enters from the first inlet and outlet A. Under the action of the fluid pressure difference, the fluid flows to the main valve port 1120 and then opens the valve core 31, so that the valve core 31 slides axially upward relative to the valve stem 21, and the valve core 31 leaves the main valve port 1120, and the first inlet and outlet A is connected with the second inlet and outlet B.

[0049] like Figure 1 As shown, the control valve includes a first flow channel X for fluid to flow from the first inlet and outlet A to the main valve port 1120, and the minimum flow area of ​​the first flow channel X is greater than the flow area of ​​the main valve port 1120, so that the main valve port 1120 has a throttling function in this working mode. When the control valve is applied to an air-conditioning system, in this working mode, the control valve realizes the throttling function in the cooling state.

[0050] The second working mode:

[0051] like Figure 2 The figure shows a schematic diagram of the structure of the control valve of the first embodiment in the second working mode. As shown in the figure, the valve stem 21 is in the first relative position relative to the connecting sleeve 12, and the fluid enters from the second inlet and outlet B. The valve core 31 can slide relative to the valve stem 21 toward the main valve port 1120 under its own gravity and close the main valve port. At this time, the fluid can pass through the connecting channel of the valve core 31 and communicate with the main valve port 1120 through the inside of the valve core 31 and flow out from the first inlet and outlet A. When the control valve is applied to an air-conditioning system, in this working mode, the control valve realizes the throttling function in the heating state.

[0052] In this mode, if Figure 4 and Figure 5 As shown, since the valve core 31 is designed with a large-aperture section 311 and a small-aperture section 312, and the inner diameter of the small-aperture section 312 is smaller than the inner diameter of the large-aperture section 311, and further, the minimum flow area of ​​the small-aperture section 312 is smaller than the flow area of ​​the main valve port 1120, the benefit of the small-aperture section 312 is that it is equivalent to adding a throttling line between the main valve port 1120 and the second inlet and outlet B, which is also equivalent to extending the throttling time or extending the length of the throttling flow channel, thereby improving the heating effect when it is applied to the air-conditioning system.

[0053] The third working mode:

[0054] like Figure 3 As shown in the figure, in this working mode, the control valve has a cut-off function. Specifically, as shown in the figure, compared with Figure 1 or Figure 2 The valve stem 21 is shown in a first relative position relative to the connecting sleeve 12. Figure 3In the state shown, the valve stem 21 is in a second relative position relative to the connecting sleeve 12. The second relative position is in the first relative position state. Figure 2 In the state shown, the valve stem 21 is threadedly rotated relative to the connecting sleeve 12 in the direction close to the main valve port 1120, and the valve stem 21 is axially closed to the auxiliary valve port 30 of the valve core 31 according to the specified torque. The valve core 31 is further pressed against the seat body 112 through force transmission, so that the valve core 31 further closes the main valve port 1120 to improve the leakage of the control valve at the main valve port 1120. The valve core 31 can cut off the connection between the first inlet and outlet A and the second inlet and outlet B.

[0055] When the main valve port 1120 needs to be opened, the valve stem 21 is moved upward relative to the connecting sleeve 12 , and then the valve core 31 can leave the main valve port 1120 under the action of the fluid pressure entering from the first fluid port A.

[0056] like Figure 4 and Figure 5 As shown, in this embodiment, the lower end surface of the valve core 31 abuts against the upper end surface of the seat body 112 to close the main valve port 1120. In order to further improve the sealing performance of the cooperation between the two, at least one circle of annular groove 3121A is designed on the lower end surface of the valve core 31, that is, the end surface of the small aperture section 312 facing the main valve port 1120, so as to reduce the contact area between the valve core 31 and the seat body 112, thereby increasing the sealing pressure ratio and improving the sealing effect.

[0057] like Figure 6 As shown in FIG. 1 , it is a schematic diagram of the structure of the control valve of the second embodiment of the present application. Figure 1 The differences between the first embodiment and the second embodiment are described in detail. The same parts of the present embodiment and the first embodiment are referenced to the present embodiment using the same figure marks, and their structures are not described repeatedly.

[0058] like Figure 6 As shown, combined with Figure 1-Figure 3 The difference between this embodiment and the first embodiment mainly lies in the structural difference of the main valve body 11A. Figure 6 As shown, the main valve body 11A includes a shell and a seat body 112. The shell includes a first shell 111A and a second shell 111B. The first shell 111A and the second shell 111B are made of stainless steel and are tubular. One end of the second shell 111B is welded and fixed to the seat body 112 or the first shell 111A. Figure 6In the embodiment shown, the seat body 112 is made of a stainless steel sheet by stamping, and its structure is the same as the seat body structure shown in the first embodiment. The first shell 111A is provided with an annular protrusion 1110 through a hole drawing process on its side wall, and one end of the annular protrusion 1110 is used as a first interface B1. One end of the joint 13 extends from the annular protrusion 1110 into the first shell 111A, and the outer wall of the joint 13 is welded and fixed to the annular protrusion 1110. One end of the second shell 111B is provided with a first inlet and outlet A for fluid to enter or flow out through a flaring process, and the other end extends into the annular portion 1122 of the seat body 112, and the seat body 112, the first shell 111A and the second shell 111B are welded and fixed. The first filter element 4 is located in the second shell 111B and is welded and fixed to the seat body 112, that is, in the embodiment, the shell is a split structure, which is beneficial in that, on the one hand, the processing technology of the shell is simpler than that of the shell 111 in the first embodiment.

[0059] In this embodiment, the first shell 111A, the second shell 111B, the seat body 112 and the first filter element 4 can be fixed by one-time furnace welding, or by resistance welding or laser welding.

[0060] like Figure 7 As shown in FIG. 1 , it is a schematic diagram of the structure of the control valve of the third embodiment of the present application. Figure 1 The differences between the first embodiment and the second embodiment are described in detail. The same parts of the present embodiment and the first embodiment are referenced to the present embodiment using the same figure marks, and their structures are not described repeatedly.

[0061] like Figure 7As shown, the difference between this embodiment and the first embodiment mainly lies in the structural difference of the main valve body. In this embodiment, the control valve includes a main valve body 11C, and the main valve body 11C includes a first shell 111C and a second shell 112C. The first shell 111C is made of stainless steel and is in a tubular shape. The first shell 111C is drawn out of an annular protrusion 1110 on its side wall by a drawing hole process. One end of the annular protrusion 1110 serves as a first interface B1. One end of the connector 13 extends from the annular protrusion 1110 into the first shell 111C, and the outer wall of the connector 13 is welded and fixed to the annular protrusion 1110. The second shell 112C is made of a stainless steel plate by stretching and punching, or is made of stainless steel and is in a tubular shape, and one end is rolled to form 1122C below. The second shell 112C is an integral piece, that is, a part. The second shell 112C includes a cylindrical portion 1121C and a plate portion 1122C. The first shell 111C is welded and fixed to the second shell 112C. Specifically, the cylindrical portion 1121C partially extends into the first housing 111C and is welded and fixed to the first housing 111C, and the end of the cylindrical portion 1121C away from the first housing 111C includes the first inlet and outlet A. The plate portion 1122C includes the main valve port 1120, and the plate portion 1122C is located in the first housing 111C. The first filter element 4 is located in the second housing 112C and below the plate portion 1122C, and can filter the fluid entering from the first inlet and outlet A.

[0062] Compared with the main valve body shown in the second embodiment, the main valve body of this embodiment has fewer parts and components, and compared with the main valve body shown in the first embodiment, the processing difficulty is relatively small.

[0063] The control valves of the above-mentioned embodiments include a connection portion Z. The connection portion Z is for facilitating welding of the main body with the external component. The connection portion Z may be a copper layer or a copper sleeve. In the first embodiment, part of the inner wall and / or part of the outer wall of the housing 111 has the connection portion Z. In the second embodiment, part of the inner wall and / or part of the outer wall of the second housing 111B has the connection portion Z. In the third embodiment, part of the inner wall and / or part of the outer wall of the second housing 112C has the connection portion Z.

[0064] Compared with the control valve shown in the background art, the control valve shown in the above embodiments has a main valve body made of stainless steel and a connecting sleeve made of stainless steel. Compared with the brass cast valve body in the background art, the material cost is low.

[0065] Furthermore, the valve stem is also made of stainless steel, without the need to use brass material, which not only reduces the cost of the control valve, but also helps to achieve lightweight and miniaturization of the control valve, and enables the control valve to meet lead-free requirements.

[0066] The above description is only an example of a specific embodiment of the present invention and should not be construed as a limitation on the protection points of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A control valve, characterized in that: It comprises a valve body component, a switch component and a valve core component, the valve body component comprises a connecting sleeve and a main valve body, the connecting sleeve is made of stainless steel, the main valve body is made of stainless steel, the connecting sleeve is welded and fixed to the main valve body, the main valve body comprises a main valve port, the valve core component is located in the inner cavity of the valve body component, the valve core component comprises a valve core, and the valve core comprises an auxiliary valve port; the switch component comprises a valve stem, the valve stem can open or close the auxiliary valve port, and the valve stem cooperates with the valve core to open or close the main valve port; The connecting sleeve is cylindrical, and the connecting sleeve includes a first radial inward convex section. The valve stem includes a first radial outward convex section. In the axial direction of the connecting sleeve, the first radial outward convex section is located below the first radial inward convex section. The valve stem is threadedly connected to the connecting sleeve, and the first radial inward convex section limits the upward movement of the valve stem relative to the connecting sleeve.

2. The control valve according to claim 1, characterized in that: The outer wall of the connecting sleeve includes a second radial outward protrusion section and a first insertion section, the second radial outward protrusion section abuts against the upper end of the main valve body, the first insertion section is located in the main valve body, the first insertion section is welded and fixed to the main valve body and / or the second radial outward protrusion section is welded and fixed to the main valve body; the inner wall of the connecting sleeve includes a first internal threaded section, the valve stem includes a second external threaded section, and the first internal threaded section is threadedly matched with the first external threaded section.

3. The control valve according to claim 2, characterized in that: The valve stem includes a third radial outward protrusion section and a seal installation section, and the switch component also includes a seal. The seal is sleeved on the seal installation section, and the seal abuts against the outer wall of the seal installation section and the inner wall of the connecting sleeve. The first radial outward protrusion section and the third radial outward protrusion section axially limit the seal.

4. The control valve according to claim 3, characterized in that: The main valve body includes a shell and a seat body, the shell is an integral structure, the shell is made of stainless steel, the shell is tubular, the shell abuts against the second radial outward convex section, the shell is welded and fixed to the connecting sleeve, the seat body is located in the shell, the seat body is made of stainless steel, the seat body is welded and fixed to the shell, and the seat body includes the main valve port.

5. The control valve according to claim 4, characterized in that: The shell includes a first straight cylinder portion, a first conical ring portion, a second straight cylinder portion, a second conical ring portion and a third straight cylinder portion, the first conical ring portion connects the first straight cylinder portion and the second straight cylinder portion, the second conical ring portion connects the second straight cylinder portion and the third straight cylinder portion, the inner diameter of the first straight cylinder portion is greater than the inner diameter of the second straight cylinder portion, the first straight cylinder portion is welded and fixed to the connecting sleeve, the seat body is located in the first straight cylinder portion, and the seat body is welded and fixed to the first straight cylinder portion.

6. The control valve according to claim 3, characterized in that: The main valve body includes a shell and a seat body, the shell includes a first shell body and a second shell body, the first shell body is made of stainless steel material, the first shell body is tubular, the first shell body is welded and fixed to the connecting sleeve, the second shell body is made of stainless steel material, the second shell body is tubular, the seat body is made of stainless steel material, the seat body includes the main valve port, and the first shell body, the seat body, and the second shell body are welded and fixed.

7. The control valve according to claim 3, characterized in that: The main valve body includes a shell, the seat body is stamped from a stainless steel plate, the seat body includes a plate portion and an annular portion, the plate portion includes the main valve port, the annular portion extends from the outer edge of the plate portion away from the valve core, and the annular portion is welded and fixed to the shell.

8. The control valve according to claim 3, characterized in that: The main valve body includes a first shell and a second shell, the first shell is made of stainless steel material, the first shell is tubular, the upper end of the first shell is abutted against the second radial outward convex section, the first shell is welded and fixed to the first insertion section, the second shell is made of stainless steel material, the second shell is an integral structure, the second shell includes a cylindrical portion and a plate portion, the outer wall of the cylindrical portion is welded and fixed to the first shell, and the plate portion includes the main valve port.

9. The control valve according to any one of claims 1 to 8, characterized in that: The valve stem includes a valve stem guide section, the valve core is axially through-set, the inner wall of the valve core is slidably matched with the outer wall of the valve stem guide section, and the valve core includes a communication channel; The control valve comprises a first fluid port and a second fluid port, and the control valve comprises a first working mode, a second working mode and a third working mode, In the first working mode, the first fluid port serves as a fluid inlet, the valve core opens the main valve port, the valve stem closes the auxiliary valve port, and the first fluid port is connected to the second fluid port through the main valve port; In the second working mode, the second fluid port serves as a fluid inlet, the valve core closes the main valve port, the valve stem does not close the auxiliary valve port, and the first fluid port is connected to the second fluid port through the communication channel, the auxiliary valve port and the main valve port; In the third working mode, the valve core closes the main valve port, the valve stem closes the auxiliary valve port, and the first fluid port is not connected to the second fluid port.

10. The control valve according to claim 9, characterized in that The valve core includes a large-diameter section and a small-diameter section, the flow area of ​​the large-diameter section is larger than the flow area of ​​the small-diameter section, the small-diameter section includes the auxiliary valve port, the valve stem guide section is at least partially located in the large-diameter section, the connecting sleeve is made by turning a bar, the connecting sleeve includes a first guide section located at the lower side of the third radial outward protrusion section, the control valve is in the first working mode, the large-diameter section is partially located in the first guide section, the connecting channel is a through hole connecting the inner wall and the outer wall of the large-diameter section, the main valve port and the first fluid port include a first flow channel, the flow area of ​​the main valve port is smaller than the flow area of ​​the first flow channel, and the flow area of ​​the auxiliary valve port is smaller than the flow area of ​​the main valve port.

11. The control valve according to claim 9, characterized in that The valve body component also includes a joint, which is made of stainless steel material and includes a through hole. The side wall of the main valve body includes an annular protrusion. The joint is welded and fixed to the annular protrusion, and the joint includes the second fluid port.

12. The control valve according to any one of claims 1 to 8, characterized in that: The valve body component also includes a joint, which is made of stainless steel material and includes a through hole. The side wall of the main valve body includes an annular protrusion. The joint is welded and fixed to the annular protrusion. The joint includes the second fluid port. The valve core is made of non-metallic material.

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