A dual piston valve and method of assembly thereof

Abstract

This application provides a dual-piston valve and its assembly method, including a valve body and a piston assembly. The valve body has a first valve port and a second valve port distributed axially. The piston assembly includes a spindle and two pistons connected to the spindle. The spindle can move axially to drive one piston to block the first valve port or drive the other piston to block the second valve port. The piston assembly also includes a first spring and a second spring. The first spring can press against the corresponding piston to block the first valve port, and the second spring can press against the corresponding piston to block the second valve port. At least one piston is equipped with an elastic sealing part and a spring seat. The elastic sealing part is arranged around the spindle and is compressed axially between the spring seat and the piston, and radially between the spindle and the piston. The first spring and the second spring press against the corresponding spring seat axially. The positioning of the elastic sealing part between the spindle and the piston of this dual-piston valve is relatively reliable and the assembly is simple.

Description

Technical Field

[0001] This application relates to the field of valve technology, specifically to a double piston valve and its assembly method. Background Technology

[0002] The dual-piston valve includes a spindle and a first piston and a second piston mounted on the spindle. The valve body of the dual-piston valve is provided with a first valve port and a second valve port. The spindle can move up and down along the axial direction to drive the first piston to block the first valve port and the second piston to open the second valve port, or the first piston to open the first valve port and the second piston to block the second valve port.

[0003] The aforementioned dual-piston valve has a spindle through which the first piston and the second piston pass. To prevent leakage at the location where the spindle passes through the first piston and the second piston, a sealing ring is also provided to seal the spindle and the piston. However, the sealing ring is prone to detaching from the sealing position, affecting the sealing effect. Some related technical solutions use methods such as riveting and hot melting for positioning, which makes the assembly process cumbersome. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this application is to provide a dual-piston valve and its assembly method, wherein the positioning of the elastic sealing part between the spindle and the piston is more reliable and the assembly is simple.

[0005] The dual-piston valve provided in this application includes a valve body and a piston assembly. The valve body is provided with a first valve port and a second valve port distributed along the axial direction. The piston assembly includes a spindle and two pistons connected to the spindle. The spindle can move along the axial direction to drive one of the pistons to block the first valve port or drive the other piston to block the second valve port.

[0006] The piston assembly further includes a first spring and a second spring, wherein the first spring can press against the corresponding piston to block the first valve port, and the second spring can press against the corresponding piston to block the second valve port;

[0007] At least one of the pistons is provided with an elastic sealing part and a spring seat. The elastic sealing part is arranged around the mandrel. The elastic sealing part is compressed axially between the spring seat and the piston, and compressed radially between the mandrel and the piston. The first spring and the second spring press against the corresponding spring seat axially.

[0008] This application also provides a method for assembling a dual-piston valve, wherein the dual-piston valve is the dual-piston valve described above;

[0009] The elastic sealing part is inserted into the groove of the piston;

[0010] The piston with the elastic sealing part, the first spring seat, and the first spring are sequentially inserted into the mandrel from one end of the mandrel.

[0011] The above-described components are installed into the valve body, and then another piston with an elastic seal is installed into the spindle.

[0012] In this application, the elastic sealing part used to seal the mandrel and piston is compressed radially between the piston and mandrel, and axially between the spring seat and piston, meaning the elastic sealing part can be reliably positioned. Simultaneously, the compression holding force of the elastic sealing part comes from the resisting force of the corresponding first or second spring; that is, the first and second springs, while resisting the corresponding piston, can also resist the elastic sealing part, eliminating the need for other structures to position the elastic sealing part. Furthermore, by providing a dedicated spring seat to transmit the spring's resisting force, compared to the spring directly resisting the elastic sealing part, the spring seat can more evenly and reliably resist the corresponding elastic sealing part axially, preventing the piston and elastic sealing part from detaching axially and affecting the sealing effect. Conversely, the spring seat can also more stably support the corresponding spring.

[0013] The assembly method for the dual piston valve provided in this application involves assembling multiple parts sequentially, eliminating the need for riveting, hot melting, and other processes as described in the prior art, making assembly relatively simple. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a dual-piston valve in an embodiment of this application, with the dual-piston valve in a first state;

[0015] Figure 2 for Figure 1 A schematic diagram of the dual piston valve in its second state;

[0016] Figure 3 for Figure 1 A three-dimensional structural diagram of the piston assembly;

[0017] Figure 4 for Figure 3 Explosion diagram of the piston assembly;

[0018] Figure 5 for Figure 3 Front view of the piston assembly;

[0019] Figure 6 for Figure 5 Schematic cross-section along the AA direction;

[0020] Figure 7 for Figure 6 Enlarged diagram of part B in the middle;

[0021] Figure 8 for Figure 6 Enlarged schematic diagram of part C in the middle;

[0022] Figure 9 for Figure 1 Enlarged schematic diagram of part D in the middle;

[0023] Figure 10 for Figure 5 A schematic diagram of the structure of the second piston or the first piston;

[0024] Figure 11 for Figure 10 A cross-sectional view along the EE direction;

[0025] Figure 12 for Figure 5 A schematic diagram of the structure of the first or second spring seat;

[0026] Figure 13 for Figure 12 A schematic diagram of the three-dimensional structure;

[0027] Figure 14 for Figure 1 Enlarged schematic diagram of part F in the middle;

[0028] Figure 15 for Figure 3 Schematic diagram of the central mandrel;

[0029] Figure 16 for Figure 4 A schematic diagram of the structure of the first retaining ring;

[0030] Figure 17 for Figure 7 A schematic diagram of the structure of the first spring.

[0031] The annotations in the attached figures are explained as follows:

[0032] 100-Double piston valve;

[0033] 10-Motor mount; 10a-First guide hole; 101-Second annular boss; 102-Sealing assembly;

[0034] 20-Valve body; 20a-First interface section; 20b-Second interface section; 20c-Third interface section; 20d-First valve port section; 20e-Second valve port section;

[0035] 30-Connector; 30a-Second guide hole; 301-First annular boss; 302-Bottom wall;

[0036] 40 - Piston assembly;

[0037] 401-Mandrel; 401a-First annular groove; 401b-Second annular groove; 401c-Third annular groove; 4021-First retaining ring; 4022-Second retaining ring; 4023-Third retaining ring; 402a-Opening; 403-Third spring seat; 4041-First spring; 4042-Second spring; 4051-First piston; 4052-Second piston; 405a-Annular sealing groove; 405b-Retaining ring groove; 405c-Groove structure; 405d-Groove portion; 405e-Through hole; 4053- Piston bottom; 4054-Piston sidewall; 4055-Annular protrusion; 40551-First conical surface; 4056-Gutter bottom wall; 4057-Gutter sidewall; 4061-First sealing component; 4062-Second sealing component; 4071-First elastic sealing part; 4072-Second elastic sealing part; 4081-First spring seat; 4082-Second spring seat; 4083-Spring seat bottom; 4083a-Opening; 4084-Spring seat sidewall; 40841-Second conical surface; 4085-Spring seat flange;

[0038] 50 - Guided positioning structure. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. In the embodiments of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0040] Please refer to Figure 1 and Figure 2 , Figure 1 This is a structural schematic diagram of a double piston valve 100 in an embodiment of this application, specifically a cross-sectional view of the double piston valve 100 along the axial direction. The double piston valve 100 is specifically a double piston three-way valve. The fluid flowing through the double piston valve 100 is, for example, water. The double piston valve 100 can be used, for example, in an integrated water circuit. Figure 1 The dual piston valve 100 is in the first state; Figure 2 for Figure 1 A schematic diagram of the middle double piston valve 100 in its second state.

[0041] The dual-piston valve 100 in this embodiment includes a valve body 20, which has a valve cavity. A first interface portion 20a is provided on the side of the valve body 20, and a second interface portion 20b is provided at one axial end of the valve body 20. The second interface portion 20b is connected to a connector 30, which connects to a first external connecting pipe (not shown in the figure). The connector 30 may be threaded for threaded connection with the first external connecting pipe, or other connection methods may be used. The first interface portion 20a can be directly or indirectly connected to the corresponding second external connecting pipe (not shown in the figure). A third interface portion 20c is also provided on the side of the valve body 20, which can be directly or indirectly connected to a third external connecting pipe (not shown in the figure). Furthermore, a first valve port portion 20d and a second valve port portion 20e are provided axially distributed inside the valve body 20. The first valve port portion 20d communicates with the third interface portion 20c, and the second valve port portion 20e communicates with the second interface portion 20b.

[0042] The dual-piston valve 100 also includes a piston assembly 40, which is located within the valve chamber of the valve body 20. The piston assembly 40 includes a spindle 401 and two pistons connected to the spindle 401. These pistons are the valve cores of the dual-piston valve 100. The spindle 401 can move axially to drive one piston to block the first valve port 20d or to drive the other piston to block the second valve port 20e. Figure 1 As shown, the two pistons are the first piston 4051 and the second piston 4052. The dual-piston valve 100 includes a motor mount 10 for mounting a motor to drive the spindle 401 to move axially. The first piston 4051 is closer to the motor mount 10. Assuming the motor mount 10 and valve body 20 are vertically distributed, the spindle 401 moves axially upwards, causing the second piston 4052 to block the second valve port 20e. The first piston 4051 moves away to open the first valve port 20d. At this time, the dual-piston valve 100 is in the first state, with the first interface 20a and the third interface 20c connected, and the first interface 20a and the second interface 20b disconnected. Figure 2 As shown, the spindle 401 moves downward along the axial direction, causing the first piston 4051 to block the first valve port 20d and the second piston 4052 to move away to open the second valve port 20e. At this time, the double piston valve 100 is in the second state, the first interface 20a and the second interface 20b are connected, and the first interface 20a and the third interface 20c are disconnected.

[0043] The first interface section 20a can serve as a fluid inlet, such as Figure 1 , 2 The change in fluid flow direction is indicated by red arrows. It can be seen that, as needed, the dual piston valve 100 can also be in a third state between the first and second states, that is, the first interface 20a, the second interface 20b, and the third interface 20c can all be open to regulate the flow rate of the two passages.

[0044] like Figures 3 to 5 As shown, Figure 3 for Figure 1 A three-dimensional structural schematic diagram of the piston assembly 40; Figure 4 for Figure 3 Explosion diagram of piston assembly 40; Figure 5 for Figure 3 Front view of the piston assembly 40.

[0045] The piston assembly 40 in this embodiment also includes a first spring 4041 and a second spring 4042. The two springs are used to provide the force to block the valve core. The first spring 4041 corresponds to the first piston 4051, and the second spring 4042 corresponds to the second piston 4052. When the motor drives the spindle 401 to move so as to drive the first piston 4051 to block the first valve port 20d, the first spring 4041 presses against the first piston 4051 to the first valve port 20d. When the motor drives the spindle 401 to move in the opposite direction so as to drive the second piston 4052 to block the second valve port 20d, the second spring 4042 presses against the second piston 4053 to the second valve port 20e. That is, the springs are used to ensure the valve closing effect, and the two springs are always in a compressed state.

[0046] It is worth noting that, in this embodiment, at least one piston of the piston assembly 40 is provided with an elastic sealing part and a spring seat. The elastic sealing part is arranged around the spindle 401. The elastic sealing part is compressed axially between the spring seat and the piston. The corresponding first spring 4041 or second spring 4042 presses against the spring seat. The elastic sealing part is compressed radially between the spindle 401 and the corresponding piston. Figure 1 Each piston in the piston assembly 40 is equipped with an elastic sealing part and a spring seat. The first elastic sealing part 4071 and the first spring seat 4081 cooperate with the first piston 4051, and the second elastic sealing part 4072 and the second spring seat 4082 cooperate with the second piston 4052.

[0047] like Figures 6 to 8 As shown, Figure 6 for Figure 5 Schematic cross-section along the AA direction; Figure 7 for Figure 6 Enlarged diagram of part B in the middle; Figure 8 for Figure 6 Enlarged diagram of part C in the middle.

[0048] In this embodiment, the first elastic sealing part 4071 and the second elastic sealing part 4072 are sealing ring structures, both sleeved on the mandrel 401. The first piston 4051 and the second piston 4052 are both provided with through holes, and the mandrel 401 passes through the through holes to be inserted into the first piston 4051 and the second piston 4052. The elastic sealing part is pressed radially between the mandrel 401 and the piston, thus sealing the space between the mandrel 401 and the piston and preventing fluid leakage from the gap between the mandrel 401 and the piston.

[0049] Meanwhile, the piston assembly 40 in this embodiment includes spring seats corresponding to two springs: a first spring seat 4081 corresponding to the first spring 4041, and a second spring seat 4082 corresponding to the second spring 4042. The piston assembly 40 also includes a third spring seat 403 corresponding to the first spring 4041. Figure 7 As shown, when the first spring 4041 is compressed axially between the first spring seat 4081 and the third spring seat 403, the first spring 4041 can press against the first elastic sealing part 4071 through the first spring seat 4081.

[0050] With this configuration, compared to the first spring 4041 directly pressing against the first elastic sealing part 4071, the first spring seat 4081 can more evenly and reliably press against the first elastic sealing part 4071 along the axial direction. Especially when the first elastic sealing part 4071 is a sealing ring structure with a circular cross-section, the pressure from the first spring seat 4081 will be more stable, allowing the first elastic sealing part 4071 to be better pressed between the first piston 4051 and the spindle 401. This prevents the first piston 4051 and the first elastic sealing part 4071 from detaching axially, thus affecting the sealing effect. Furthermore, the first spring seat 4081 can also more stably support the first spring 4041. It can be seen that the first spring seat 4081 can cover one side of the first elastic sealing part 4071 axially to completely press against it. In this embodiment, the cooperation of the second spring seat 4082, the second spring 4042, the second elastic sealing part 4072, and the first piston 4051 is exactly the same as the cooperation of the first spring seat 4081, the first spring 4041, the second elastic sealing part 4072, and the first piston 4051, as follows: Figure 8 As shown, no further details will be provided.

[0051] It should be noted that one end of the first spring 4041 presses against the first spring seat 4081 axially, and the other end presses against the third spring seat 403 axially. One end of the second spring 4042 presses against the second spring seat 4082 axially, and the other end directly presses against the connector 30, meaning the connector 30 has a spring seat. Therefore, the motor housing 10 can also have a spring seat, thus omitting the third spring seat 403.

[0052] However, in this embodiment, such as Figure 9 As shown, Figure 9 for Figure 1 Enlarged schematic diagram of part D. The motor base 10 is provided with a guide positioning structure 50 for guiding and positioning the spindle 401. For ease of assembly and processing, the first spring 4041 does not directly press against the motor base 10, but a third spring seat 403 is provided on the spindle 401.

[0053] Can continue to combine Figure 7 , 8 and refer to Figure 10 and Figure 11 understand, Figure 10 for Figure 5 A schematic diagram of the structure of the second piston 4052 or the first piston 4051 in the piston assembly 40. The first piston 4051 and the second piston 4052 in the piston assembly 40 have the same structure, but are arranged symmetrically in the radial direction. Figure 11 for Figure 10 A schematic diagram of a cross-section along the EE direction.

[0054] In this embodiment, both the first piston 4051 and the second piston 4052 have a groove 405d, and the spindle 401 passes through the groove 405d, specifically through the bottom wall 4056 of the groove 405d. The piston has a through hole 405e that penetrates the bottom wall 4056. The through hole 405e is part of the through hole of the piston, and the through hole 405e allows the spindle 401 to pass through. The bottom wall 4056 is the wall surface opposite to the groove opening of the groove 405d. Figure 1 In the first piston 4051, the groove opening of the recess 405d faces the motor base 10, i.e., it is upward-facing, while the groove opening of the second piston 4052 faces the connector 30, i.e., it is downward-facing. At least a portion of the first elastic sealing part 4071 or the second elastic sealing part 4072 is placed within the corresponding groove 405d, such as... Figure 7 , 8 As shown, the first spring seat 4081 or the second spring seat 4082 is axially opposite to the groove bottom wall 4056 of the corresponding piston groove 405d. The first elastic sealing part 4071 is axially compressed between the first spring seat 4081 and the groove bottom wall 4056 of the first piston 4051, and radially compressed between the spindle 401 and the groove side wall 4057 of the first piston 4051 groove 405d. The second elastic sealing part 4072 is axially compressed between the second spring seat 4082 and the groove bottom wall 4056 of the second piston 4052, and radially compressed between the spindle 401 and the groove side wall 4057 of the second piston 4052 groove 405d.

[0055] A groove 405d is provided on the piston to limit the elastic seal. The inner diameter of the groove 405d can be set to be larger than the outer diameter of the spindle 401 and to facilitate the insertion of the elastic seal. The elastic seal does not need to be set with a large radial dimension, and can reliably achieve radial sealing with the relatively small outer diameter of the spindle 401.

[0056] Furthermore, such as Figure 11 As shown, both the first piston 4051 and the second piston 4052 include a piston bottom 4053 and a piston sidewall portion 4054 surrounding the piston bottom 4053. That is, the piston as a whole is a groove structure 405c. The groove cavity and the through hole 405e of the groove structure 405c form a through hole on the piston through which the mandrel 401 can pass. The groove opening of the first piston 4051 is axially upward, and the groove opening of the second piston 4052 is axially downward. The piston bottom 4053 has an axially extending annular protrusion 4055, which is the groove sidewall portion of the aforementioned groove portion 405d. The inner surface of the annular protrusion 4055 is the groove sidewall 4057 of the groove portion 405d, and a portion of the inner surface of the piston bottom 4053 is the groove bottom wall 4056.

[0057] like Figure 12 and Figure 13 As shown, Figure 12 for Figure 5 A schematic diagram of the structure of the first spring seat 4081 or the second spring seat 4082; Figure 13 for Figure 12 A schematic diagram of the three-dimensional structure.

[0058] The spring seat includes a spring seat bottom 4083 and a spring seat side wall portion 4084 surrounding the spring seat bottom 4083. The spring seat bottom 4083 and the groove bottom wall 4056 of the groove portion 405d are disposed opposite to each other. The spring seat side wall portion 4084 covers the outside of the annular protrusion 4055. The spring seat bottom 4083 has an opening 4083a for the mandrel 401 to pass through.

[0059] With this configuration, the annular protrusion 4055 and the spring seat are in a radially upper limit engagement, making the positions of the first spring seat 4081 and the second spring seat 4082 more stable, so as to maintain coaxial arrangement with the corresponding first piston 4051 and second piston 4052, thereby better limiting the first elastic sealing part 4071 or the second elastic sealing part 4072 and ensuring the sealing effect.

[0060] In some specific embodiments, the outer surface of the annular protrusion 4055 is a first conical surface 40551, and the inner surface of the spring seat sidewall portion 4084 is a second conical surface 40841 adapted to the first conical surface 40551. The conical surface fit helps to ensure a tighter fit between the annular protrusion 4055 and the spring seat.

[0061] like Figure 7 , 8 As shown, in this embodiment, the edge of the spring seat sidewall portion 4084 also has a radially extending spring seat flange 4085, which axially abuts against the piston bottom 4053, that is, against the portion of the piston located between the annular protrusion 4055 and the piston sidewall portion 4054. With this arrangement, the fit between the spring seat and the piston is more reliable.

[0062] At this time, the first spring 4041 or the second spring 4042 presses against the spring seat flange 4085 of the corresponding spring seat. That is, the first spring 4041 and the second spring 4042 press against the corresponding spring seat flange 4085 to press the spring seat against the corresponding piston. In this way, the contact is more reliable, and the piston side wall 4054 can limit and support the first spring 4041 or the second spring 4042. The first spring 4041, the second spring 4042 and the corresponding piston side wall 4054 can be in contact or have a slight gap, that is, one end of the first spring 4041 or the second spring 4042 can be limited within the piston side wall 4054 of the corresponding piston.

[0063] Can be combined Figure 9 as well as Figure 14 understand, Figure 14 for Figure 1 Enlarged schematic diagram of part F in the middle.

[0064] In this embodiment, the motor base 10 of the dual piston valve 100 is provided with a first guide hole 10a, and the connector 30 is provided with a second guide hole 30a. One end of the spindle 401 is inserted axially into the first guide hole 10a, and the other end of the spindle 401 is inserted axially into the second guide hole 30a. That is, during the axial movement of the spindle 401, one end of the spindle 401 is always located in the first guide hole 10a, and the other end is located in the second guide hole 30a, thereby providing guidance and support for the spindle 401 and preventing leakage caused by the spindle 401 being misaligned. Figure 14 As shown, the connector 30 has a cylindrical main body 303, a portion of which is inserted into the valve body 20. The inner wall of the cylindrical main body 303 extends radially to form a bottom wall 302. The connector 30 also includes a first annular boss 301 extending axially from the bottom wall 302. The inner hole of the first annular boss 301 serves as a second guide hole 30a. In this case, the bottom wall 302 acts as a spring seat, and the aforementioned second spring 4042 can abut against the bottom wall 302. It can be seen that the connector 10 with this structure can be used as a spring seat and also as a guide and limiter for the spindle 401.

[0065] In addition, such as Figure 15As shown, the motor base 10 has a second annular boss 101. The spindle 401 passes through the second annular boss 101 and the first guide hole 10a in sequence in the direction away from the piston. A sealing assembly 102 can be provided between the second annular boss 101 and the spindle 401 to further improve the sealing effect and prevent fluid from entering the motor base 10.

[0066] You can continue to refer to this. Figure 7 and Figure 8 and combined Figure 15 , 16 understand, Figure 15 for Figure 3 Schematic diagram of the central spindle 401; Figure 16 for Figure 4 A schematic diagram of the structure of the first retaining ring 4021.

[0067] As mentioned above, the first spring 4041 in the piston assembly 40 presses against the first spring seat 4081 and the third spring seat 403. In this case, the piston assembly 40 may also include a first retaining ring 4021. The spindle 401 is provided with a first annular groove 401a, and a portion of the first retaining ring 4021 is embedded in the first annular groove 401a. The first spring 4041 presses against the third spring seat 403 against the first retaining ring 4021. That is, by providing the first annular groove 401a for assembling the first retaining ring 4021, the third spring seat 403 is limited, facilitating assembly. The first retaining ring 4021 can be as follows: Figure 16 The shown is an open retaining ring, which is not a complete annular structure, but has an opening 4021a so that it can be inserted into the first annular groove 401a.

[0068] In this embodiment, the piston assembly 40 further includes a second retaining ring 4022 and a third retaining ring 4023. For example... Figure 13 As shown, the mandrel 401 is also provided with a second annular groove 401b and a third annular groove 401c, with the first annular groove 401a, the second annular groove 401b, and the third annular groove 401c distributed sequentially from top to bottom along the axial direction. Part of the second retaining ring 4022 is embedded in the second annular groove 401b, and part of the third retaining ring 4023 is embedded in the third annular groove 401c. At this time, the first spring 4041 presses against the first piston 4051 against the second retaining ring 4022, and the second spring 4042 presses against the second piston 4052 against the third retaining ring 4023. The piston is limited by the retaining rings, making assembly relatively simple. However, it is not limited to this; the piston can also be connected to the mandrel 401 in other ways, such as by snap-fit.

[0069] Let's look again. Figure 17 , Figure 17 for Figure 7 A schematic diagram of the structure of the first spring 4041.

[0070] In this embodiment, the first spring 4041 can be a conical spring, with its radial dimension gradually increasing towards the first piston 4051. Figure 7 Understandably, the radial dimension of the first spring 4041 gradually increases from top to bottom, with the end having the largest radial dimension abutting against the first spring seat 4051, thus indirectly abutting against the first piston 4051. For example... Figure 1 As shown, radially, the first spring 4041 roughly corresponds to the position of the third interface 20c. Setting the first spring 4041 as a conical spring allows for better stabilization of the first piston 4051 without affecting fluid flow to the third interface 20c, preventing the first piston 4051 from wobbling. The second spring 4042 can be set with a larger radial dimension to also prevent the second piston 4052 from wobbling. Overall, the opening height of the two pistons does not affect flow, the minimum cutoff area is large, and the flow capacity of the second interface 20b and the third interface 20c of the valve body 20 is strong.

[0071] Let's look again. Figure 7 , 8 In this embodiment, the piston assembly 40 further includes a first sealing component 4061 and a second sealing component 4062, which can also be sealing ring structures. Both the first piston 4051 and the second piston 4052 are provided with an annular sealing groove 405a. The annular sealing groove 405a can be formed by an inward recess of the outer surface of the piston sidewall portion 4054. Parts of the first sealing component 4061 and the second sealing component 4062 are embedded in the corresponding annular sealing groove 405a. The first sealing component 4061 and the second sealing component 4062 can abut and seal with the corresponding first valve port portion 20d or second valve port portion 20e, improving the sealing effect.

[0072] In this embodiment, the structure of the dual piston valve 100 is also relatively simple. The piston assembly 40 includes 15 parts and 9 specifications. Some parts have the same structure, such as the two pistons, two spring seats, two elastic sealing parts, two sealing components, and three retaining rings. This makes the structure simple and easy to process.

[0073] The assembly method of the dual piston valve 100 in this embodiment is described in detail below.

[0074] First, assemble the first piston 4051:

[0075] Take the mandrel 401 and install the second retaining ring 4022 into the second annular groove 401b of the mandrel 401;

[0076] The first sealing component 4081 is installed into the first annular sealing groove 405a of the first piston 4051, and the first elastic sealing part 4071 is installed into the groove 405d of the first piston 4051 to form the first assembly; the order of assembly of the mandrel 401 and the first assembly is not limited.

[0077] Mandrel 401 can be Figure 3 In the posture shown, the first component is inserted from the upper end of the spindle 401 until the second retaining ring 4022 of the first piston 4051 is in contact. Specifically, the end face of the first piston 4051 is provided with a retaining ring groove 405b, and the bottom wall of the groove of the second retaining ring 4022 and the retaining ring groove 405b are in contact.

[0078] The first spring seat 4081 is installed from the upper end of the spindle 401;

[0079] The first spring 4041 is installed from the upper end of the spindle 401;

[0080] The third spring seat 403 is installed from the upper end of the spindle 401;

[0081] Pressure is applied from the upper end of the third spring seat 403 to compress the first spring 4041, so that the first spring seat 4081 fits against the first piston 4051, thereby positioning the first elastic sealing part 4071.

[0082] The first retaining ring 4021 is installed into the first annular groove 401a of the spindle 401, and the third retaining ring 4023 is installed into the third annular groove 401c of the spindle 401.

[0083] The piston sealing assembly is assembled as described above. Then, the piston sealing assembly is installed into the valve body 20, followed by the installation of the second piston 4052, as follows:

[0084] Flip the valve body 20;

[0085] The second sealing component 4082 is installed into the second annular sealing groove 405a of the second piston 4052, and the second elastic sealing part 4072 is installed into the groove part 405b of the second piston 4052 to form the second assembly; the second assembly can be assembled after or before the valve body 20 is flipped, and the assembly order with the piston sealing assembly is not limited.

[0086] The second component is inserted from the lower end of the spindle 401, where the upper end of the spindle 401 is the end closer to the first piston 4051, and the lower end is the end closer to 4052. It should be noted that, due to the rotation of the valve body 20, the lower end of the spindle 401, which was in the previous step, is now actually positioned above the upper end (i.e.,...). Figure 1 (Inverted position) This facilitates assembly from top to bottom. It can be seen that it is also possible to assemble from bottom to top without flipping the valve body 20.

[0087] The second spring seat 4082 is installed from the lower end of the spindle 401;

[0088] The second spring 4042 is installed into the second piston 4052;

[0089] Install the connector 30 in the valve body 29 to compress the second spring 4042. The spring force generated causes the second spring seat 4082 to fit against the second piston 4052, which serves to position the second elastic sealing part 4072.

[0090] The piston assembly 40 above has been installed.

[0091] The above description uses the installation of the first piston 4051 as an example. It can be seen that the second piston 4052 can also be installed first. In this case, the second component can be assembled first, inserted into the valve body 20 and fitted with the connector 30, and then the first piston 4051 can be assembled to form the first component, which is then inserted into the valve body 20 and subsequently the motor mount 10 is installed. In this embodiment, the structure of the motor mount 10 is relatively complex. It is more convenient and reliable to first insert it into the valve body 20 and assemble it with the first piston 4051, and then assemble the second piston 4052.

[0092] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A dual-piston valve, characterized in that, The device includes a valve body (20) and a piston assembly (40). The valve body (20) has a first valve port (20d) and a second valve port (20e) distributed along the axial direction. The piston assembly (40) includes a spindle (401) and two pistons connected to the spindle (401). The spindle (401) is axially movable to drive one of the pistons to block the first valve port (20d) or to drive the other piston to block the second valve port (20e). The piston assembly (40) further includes a first spring (4041) and a second spring (4042). The first spring (4041) can press against the corresponding piston to block the first valve port (20d), and the second spring (4042) can press against the corresponding piston to block the second valve port (20e). At least one of the pistons is provided with an elastic sealing part and a spring seat. The elastic sealing part is arranged around the mandrel (401). The elastic sealing part is compressed axially between the spring seat and the piston, and compressed radially between the mandrel (401) and the piston. The first spring (4041) and the second spring (4042) press against the corresponding spring seat axially.

2. The dual piston valve according to claim 1, characterized in that, The piston has a groove (405d), the spindle (401) passes through the groove (405d), at least a portion of the elastic seal is placed in the groove (405d), the spring seat and the bottom wall (4056) of the groove (405d) are arranged axially opposite each other, and the elastic seal is compressed axially between the spring seat and the bottom wall (4056).

3. The dual piston valve according to claim 2, characterized in that, The piston includes a piston bottom (4053) and a piston sidewall portion (4054) surrounding the piston bottom (4053). The piston bottom (4053) has an annular protrusion (4055), which is the groove sidewall portion of the groove portion (405d). The spring seat includes a spring seat bottom (4083) and a spring seat sidewall portion (4084) surrounding the spring seat bottom (4083). The spring seat bottom (4053) and the groove bottom wall (4056) of the groove portion (405d) are disposed opposite to each other. The spring seat sidewall portion (4084) covers the outside of the annular protrusion (4055).

4. The dual piston valve according to claim 3, characterized in that, The outer surface of the annular protrusion (4055) is a first conical surface (40551), and the inner surface of the spring seat sidewall (4084) is a second conical surface (40841) that is adapted to the first conical surface (40551).

5. The dual piston valve according to claim 3 or 4, characterized in that, The edge of the spring seat sidewall portion (4084) also has a radially extending spring seat flange (4085), which abuts against the piston bottom (4053) axially.

6. The dual piston valve according to claim 5, characterized in that, The first spring (4041) or the second spring (4042) presses against the flange (4085) of the spring seat corresponding to the spring seat.

7. The dual piston valve according to any one of claims 1-4, characterized in that, One axial end of the valve body (20) is connected to a motor base (10), and the other axial end of the valve body (20) is connected to a connector (30) for communicating with an external pipe. The motor base (10) is provided with a first guide hole (10a), the connector (30) is provided with a second guide hole (30a), one end of the spindle (401) is inserted into the first guide hole (10a) axially, and the other end of the spindle (401) is inserted into the second guide hole (30a) axially.

8. The dual piston valve according to any one of claims 1-4, characterized in that, One end of the valve body (20) is connected to a motor base (10) in the axial direction. The two pistons are a first piston (4051) and a second piston (4052). The first piston (4051) is closer to the motor base (10). The first spring (4041) corresponds to the first piston (4051). The first spring (4041) is a conical spring. The radial dimension of the conical spring gradually increases towards the first piston (4051).

9. The dual piston valve according to any one of claims 1-4, characterized in that, The spring seat corresponding to the first spring (4041) is the first spring seat (4081), and the spring seat corresponding to the second spring (4042) is the second spring seat (4082). The piston assembly (40) further includes a third spring seat (403), and the first spring (4041) is compressed between the first spring seat (4081) and the third spring seat (403); the piston assembly (40) further includes a first retaining ring (4021), the spindle (401) is provided with a first annular groove (401a), a portion of the first retaining ring (4021) is embedded in the first annular groove (401a), and the first spring (4041) presses against the third spring seat (403) against the first retaining ring (4021).

10. The dual piston valve according to claim 9, characterized in that, The piston assembly (40) further includes a second retaining ring (4022) and a third retaining ring (4023); the spindle (401) is also provided with a second annular groove (401b) and a third annular groove (401c), a portion of the second retaining ring (4022) is embedded in the second annular groove (401b), and a portion of the third retaining ring (4023) is embedded in the third annular groove (401c). The first spring (4041) presses against the first piston (4051) against the second retaining ring (4022), and the second spring (4042) presses against the second piston (4052) against the third retaining ring (4023).

11. A method for assembling a dual-piston valve, characterized in that, The dual piston valve (100) is the dual piston valve (100) according to any one of claims 1-10. The elastic sealing part is installed into the groove (405d) of the piston; The piston with the elastic sealing part, the first spring seat (4081), and the first spring (4041) are sequentially inserted into the mandrel from one end of the mandrel. The above-described components are installed into the valve body, and then another piston with an elastic seal is installed into the spindle.

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