valve

Abstract

A valve includes a housing, a bracket, a first valve body, a bearing, and a second valve body. The housing includes a first housing portion, a second housing portion, and a neck connecting the first housing portion and the second housing portion, a first valve body cavity is formed in the first housing portion. The bracket is disposed in the second housing portion, the bracket and the second housing portion collectively form a second valve body cavity and a pump cavity, the bracket and the neck collectively form a bearing receiving portion, the bearing receiving portion fluidly connects the first valve body cavity and the pump cavity. The first valve body is rotatably disposed in the first valve body cavity. The bearing is received in the bearing receiving portion, the bearing is configured to support a shaft of the first valve body. The second valve body is rotatably disposed in the second valve body cavity, a shaft of the second valve body is supported by the bracket. A limit portion is provided on a portion of the bracket that collectively forms the bearing receiving portion with the neck, the limit portion extends toward the bearing, the bearing has a receiving portion, the limit portion cooperates with the receiving portion to limit movement of the bearing.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valves, and more particularly to a valve for a cooling system of an internal combustion engine. BACKGROUND

[0002] A valve (or multi-way valve, thermostatic valve, thermostatic mixing valve, regulating valve, etc.) is commonly used in a cooling system of an internal combustion engine. By controlling the valve, different cooling liquid passages can be connected to control the flow path and flow rate of the cooling liquid, so as to regulate the temperature of the internal combustion engine. The valve generally comprises a housing and a valve body, and the valve body is supported by a bearing or a bracket. The bearing is usually installed in the housing by interference fit. SUMMARY

[0003] The present application provides a valve comprising a housing, a bracket, a first valve body, a bearing and a second valve body. The housing comprises a first housing portion, a second housing portion and a neck portion, the neck portion connecting the first housing portion and the second housing portion, and a first valve body cavity is formed in the first housing portion. The bracket is arranged in the second housing portion, and the bracket and the second housing portion jointly form a second valve body cavity and a pump cavity, and the bracket and the neck portion jointly form a bearing accommodating portion, the bearing accommodating portion fluidly connecting the first valve body cavity and the pump cavity. The first valve body is rotatably arranged in the first valve body cavity. The bearing is accommodated in the bearing accommodating portion, and the bearing is configured to support a shaft of the first valve body. The second valve body is rotatably arranged in the second valve body cavity, and a shaft of the second valve body is supported by the bracket. A limiting portion is arranged on a portion of the bracket which jointly forms the bearing accommodating portion with the neck portion, the limiting portion extends towards the bearing, the bearing has a receiving portion, and the limiting portion cooperates with the receiving portion to limit the movement of the bearing relative to the bearing accommodating portion.

[0004] According to the valve of the present application, the bracket comprises a base and a wall portion connected to the base, the inner side of the base and the wall portion jointly form the second valve body cavity with the second housing portion, the outer side of the wall portion jointly forms the pump cavity with the second housing portion, and the outer side of the wall portion jointly forms the bearing accommodating portion with the neck portion.

[0005] According to the valve of the present application, the bearing accommodating portion has a circular inner surface, the outer side of the wall portion of the bracket is provided with a circular arc surface, the circular arc surface jointly forms the circular inner surface of the bearing accommodating portion with the inner surface of the neck portion, and the limiting portion extends out from the circular arc surface.

[0006] According to the valve of the present application, the diameter of the circular inner surface matches the outer diameter of the bearing.

[0007] According to the valve of the present application, the limiting portion is a boss, and the receiving portion is a groove formed on the bearing, the boss being inserted into the groove.

[0008] According to the valve of the present application, the boss contacts the groove bottom of the groove.

[0009] According to the valve of the present application, the limiting portion extends perpendicularly to the axis of the first valve body towards the bearing.

[0010] According to the valve of the present application, the limiting portion extends along the circumference of the bearing receiving portion by a distance less than the distance by which the receiving portion extends along the circumference of the bearing receiving portion.

[0011] According to the valve of the present application, the bearing is provided with an opening to fluidly connect the first valve body cavity with the pump cavity.

[0012] According to the valve of the present application, the limiting portion and the bracket are integrally formed by an injection molding process.

[0013] The structure of the limiting portion cooperating with the receiving portion according to the present application can effectively retain the bearing in the housing. The valve of the present application is simple to assemble, reduces the complexity of the assembly structure, and is conducive to miniaturization. Various advantages of the valve of the present application will be described in detail below in conjunction with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1A is a perspective view of one embodiment of the valve of the present application;

[0015] Figure 1B is an exploded view of the valve shown in Figure 1A

[0016] Figure 2 is a perspective view of the bracket of the valve shown in Figure 1B

[0017] Figure 3 is a perspective view of the cover assembly of the valve shown in Figure 1B

[0018] Figure 4 is a perspective view of the valve shown in Figure 1A DETAILED DESCRIPTION

[0019] Various specific embodiments of the present application will be described below with reference to the accompanying drawings, which are incorporated in this specification. It should be understood that, although terms indicating directions, such as "front", "back", "up", "down", "left", "right", "in", "out", "top", "bottom", etc. are used in the present application to describe various example structural parts and elements of the present application, these terms are used herein only for the purpose of convenience of explanation, and are determined based on the example orientation shown in the drawings. Since the embodiments disclosed in the present application can be arranged in different directions, these terms indicating directions are only for illustration and should not be considered as limiting.

[0020] Figure 1A is a perspective view of one embodiment of the valve 100 of the present application, Figure 1B is​​​​Figure 1A An exploded view of the valve 100 is shown to illustrate the overall structure and specific components of the valve 100. As shown, Figure 1B The valve 100 includes a housing 101, a bracket 106, a first valve body 111, a bearing 112, a second valve body 113, a cover assembly 190, and a gear 115. The housing 101, the bracket 106, the first valve body 111, the bearing 112, the second valve body 113, and the gear 115 are shown in Figure 1A As can be seen, the first valve body 111, the bearing 112, the second valve body 113, the gear 115, and the bracket 106 are all housed inside the housing 101, and the cover assembly 190 seals the lower end of the housing 101 to retain the above-mentioned components inside the housing 101.

[0021] As shown, Figure 1B The housing 101 is made of plastic material, and includes a first housing portion 102, a second housing portion 103, and a neck portion 104. The first housing portion 102 has a first valve body cavity 105 formed therein, and the volume of the first valve body cavity 105 is greater than the volume of the first valve body 111, so that the first valve body 111 can be rotatably housed in the first valve body cavity 105. The first housing portion 102 has tube openings 192 and 193 formed therein, and the tube openings 192 and 193 are in the form of circular tubes and are in fluid communication with the first valve body cavity 105, so that liquid can flow into the valve 100 through the tube openings 192 and 193.

[0022] The second housing portion 103 is located below the first housing portion 102, and the bracket 106, the second valve body 113, and the gear 115 are housed in the left side of the second housing portion 103. The second housing portion 103 has a tube opening 194 formed therein, and the tube opening 194 is in fluid communication with the interior of the second housing portion 103, so that liquid can flow out of the valve 100 through the tube opening 194.

[0023] The neck portion 104 is located between the first housing portion 102 and the second housing portion 103, and connects the first housing portion 102 and the second housing portion 103, and is used to house the bearing 112. The neck portion 104 has a circular-arc-shaped inner surface 114, and the height and diameter of the circular-arc-shaped inner surface 114 are matched with the height and outer diameter of the bearing 112, respectively. For example, the height of the circular-arc-shaped inner surface 114 is greater than or equal to the height of the bearing 112, and the diameter of the circular-arc-shaped inner surface 114 is equal to or slightly greater than the outer diameter of the bearing 112, so that the circular-arc-shaped inner surface 114 can house the bearing 112.

[0024] The first valve body 111 includes a hollow body 125 and a shaft 121 connected to the body 125. The body 125 includes two coaxially arranged spherical portions, and the body 125 can rotate about the shaft 121 so that the fluid communication between the ports 192 / 193 and the first valve body cavity 105 can be disconnected or connected by the second valve body 111. The upper end of the shaft 121 is inserted into a corresponding shaft hole (not shown) in the first housing portion 102, and the lower end of the shaft 121 is supported by the bearing 112, so that the first valve body 111 can be rotatably held in the first valve body cavity 105. The first valve body 111 has a plurality of teeth 151 at the lower portion thereof. The teeth 151 are engaged with the gear 115, so that the first valve body 111 can drive the gear 115 to rotate.

[0025] The bearing 112 is made of a plastic material, and has a substantially annular outer profile. The bearing 112 has an annular side wall 156 and a support portion 153 in the center thereof. The support portion 153 has a shaft hole (not shown) formed therein, and the bearing 112 supports the first valve body 111 by cooperating with the shaft 121 of the first valve body 111 through the shaft hole. The support portion 153 is connected to the annular side wall 156 by three connecting walls 155, so that three openings 122 are formed between the support portion 153 and the annular side wall 156 to allow the liquid to flow from the first housing portion 102 into the second housing portion 103. The annular side wall 156 has a receiving portion 132 at the lower end thereof. In the present embodiment, the receiving portion 132 is a groove. The groove 132 is formed by upwardly recessing the bottom surface of the annular side wall 156, and has a groove bottom 133 and inner side walls 136 and 137 on opposite sides of the groove bottom 133. The receiving portion 132 is used to cooperate with the bracket 106 to limit the movement of the bearing 112 relative to the neck portion 104, which will be described in detail later.

[0026] The second valve body 113 includes a hollow body 165 and a shaft 123 connected to the body 165. The body 165 has a substantially spherical outer profile, and includes a pair of valve body openings 167 and 169 formed through the body 165 and communicating with the hollow portion in the body 165. The body 165 can rotate about the shaft 123, so that the second valve body 113 can disconnect or connect the fluid communication between the port 194 and the interior of the second housing portion 103, or adjust the flow rate of the fluid by the second valve body 113. The upper end of the shaft 123 is inserted into a shaft hole (not shown) in the second housing portion 103, and the lower end thereof is supported by the bracket 106, so that the second valve body 113 can be held in the second valve body cavity 440 formed by the bracket 106 and the second housing portion 103 (as shown in FIG. 4). The upper end of the body 165 includes a gear 150 having a plurality of teeth 152. The teeth 152 are engaged with the gear 115, so that the gear 115 can drive the second valve body 113 to rotate by the gear 150, and the first valve body 111 can drive the second valve body 113 to rotate by the gear 115. Figure 4 ​

[0027] The bracket 106 is disposed inside the second housing portion 103 proximate to the spout 194. The bracket 106 includes a base 160 and a wall portion 180 connected to the base 160, and the inner side 116 of the base 160 and the wall portion 180 encloses a space to accommodate the second valve body 113. The outer side 117 of the wall portion 180 is capable of engaging with the neck portion 104, and the outer side 117 of the wall portion 180 has a limiting portion 131. The limiting portion 131 extends outwardly from the outer side 117 of the wall portion 180 and extends towards the bearing 112, and the limiting portion 131 is capable of cooperating with the receiving portion 132 of the bearing 112 to limit the rotation and movement of the bearing 112 relative to the housing 101.

[0028] Figure 2 is Figure 1B The bracket 106 of the valve 100 is shown in a perspective view from the inside to the outside for a clearer illustration of the structure of the bracket 106. As shown in Figure 2 The base 160 of the bracket 106 is substantially square-shaped, and the base 160 has a shaft hole 227 near the center to cooperate with the shaft 123 of the second valve body 113. The wall portion 180 includes two side walls 261, 262 extending upwardly from opposite first and second sides of the base 160 perpendicularly to the base 160. The side walls 261, 262 have circular holes 263, 264 respectively, and the circular hole 264 is aligned with and in fluid communication with the spout 194. When the second valve body 113 is in the open position, liquid flows through the circular hole 263, the second valve body 113 and the circular hole 264 in sequence, and out of the valve 100 from the spout 194. The wall portion 180 of the bracket 106 further includes a partition wall 265 extending upwardly from a third side of the base 160 and connected to the side wall 261. The partition wall 265 has a shaft 226 at the top, and the gear 115 is sleeved on the shaft 226, and the upper end of the shaft 226 is inserted into a shaft hole (not shown) on the second housing portion 103 to retain the gear 115 inside the second housing portion 103. The inner side 266 of the partition wall 265 and the inner sides of the side walls 261, 262 (i.e. the inner side 116 of the wall portion 180) together with the second housing portion 103 form a second valve body cavity 440 (as shown in Figure 4

[0029] The outer side 267 of the partition wall 265 is part of the outer side 117 of the wall portion 180. The outer side 267 of the partition wall 265 includes two circular arc surfaces 118, 119 of different diameters (as shown in Figure 1B ​(As shown). The arc surface 118 is located above the arc surface 119, and the diameter of the arc surface 118 is smaller than the diameter of the arc surface 119, causing the arc surface 119 to be recessed deeper than the arc surface 118. The diameter of the arc surface 118 is approximately equal to the diameter of the arc-shaped inner surface 114 of the neck 104. The arc surface 118 and the arc-shaped inner surface 114 join to form a complete circle, thereby accommodating the bearing 112. The arc surface 119 is used to join the inner wall of the second housing portion 103 located below the neck 104, together forming the pump cavity 441 (as shown). Figure 4 The inner wall (as shown).

[0030] A limiting part 131 is disposed at the lower end of the arc surface 118, and the limiting part 131 and the bracket 106 are integrally formed by injection molding. In this embodiment, the limiting part 131 is a boss. The boss 131 is formed by extending outward from the outer side 267 of the partition wall 265, and the boss 131 extends perpendicularly to the axis 121 of the first valve body 111 toward the bearing 112 (in Figure 4 (As shown more clearly in the image). The boss 131 has an upper surface 238 and a pair of outer sidewalls 234, 235 located on opposite sides of the upper surface 238. The specific positional relationship between the boss 131 and the recess 132 will be shown in the image. Figure 4 This will be discussed in detail later.

[0031] Figure 3 This is a perspective view of the cap assembly 190 from the inside out, used to show the structure of the cap assembly 190 more clearly. (See image below.) Figure 3 As shown, the cap assembly 190 includes a cap 398 and a pump 396 mounted on the cap 398. The cap 398 includes a support contact area 397 located on one side of the pump 396. The support contact area 397 is used to abut against the base 160 of the support 106. The pump 396 is received in a pump cavity 441 formed by the outer side 117 of the wall portion 180 of the support 106 and the second housing portion 103 (e.g., Figure 4 (As shown). The outer contour of the cover 398 matches the shape of the opening at the lower end of the second housing portion 103 so as to seal the opening at the lower end of the second housing portion 103 by means of the cover 398.

[0032] Figure 4 yes Figure 1A The perspective view of valve 100 shown, with the cap assembly 190 omitted, is used to more clearly illustrate the assembly relationship of the internal components of valve 100. (As shown...) Figure 4 As shown, combined with Figure 1A , Figure 1B and Figure 2The bracket 106 is located on the left side within the second housing portion 103, and the opening 264 of the side wall 262 of the bracket 106 is aligned with the port 194. The side wall 261 and partition wall 265 of the bracket 106 divide the internal space of the second housing portion 103 in two. The inner side 116 of the wall portion 180 of the bracket 106 and the left side portion of the second housing portion 103 together form the second valve body cavity 440 (this cavity 440 is covered by the base 160 of the bracket 106). The outer side 267 of the partition wall 265 and the outer side of the side wall 261 of the bracket 106 together with the right side portion of the second housing portion 103 together form the pump cavity 441. The second valve body cavity 440 and the pump cavity 441 are in fluid communication through the circular hole 263 on the side wall 261 of the bracket 106.

[0033] Furthermore, the arcuate surface 118 of the partition wall 265 of the bracket 106 engages with the arcuate inner surface 114 of the neck 104 to form a circular inner surface 443. As described above, the diameter of the arcuate inner surface 114 of the neck 104 matches the outer diameter of the bearing 112, and the diameter of the arcuate surface 118 of the bracket 106 is equal to the diameter of the arcuate inner surface 114. Therefore, the diameter of the circular inner surface 443 also matches the outer diameter of the bearing 112, allowing the bearing receiving portion 442 formed by the outer side 117 of the bracket 106 and the neck 104 to accommodate the bearing 112. The boss 131 on the partition wall 265 of the bracket 106 extends perpendicularly to the axis 121 of the first valve body 111 toward the bearing 112, and the boss 131 engages with the groove 132 of the bearing 112 to restrict the movement of the bearing 112 relative to the bearing receiving portion 442.

[0034] Specifically, such as Figure 4 As shown in the enlarged view within the circular dashed frame, the upper surface 238 of the boss 131 abuts against the bottom 133 of the groove 132 of the bearing 112, preventing the bearing 112 from detaching from the bearing housing 442 beyond the boss 131, thus ensuring the axial positioning of the bearing 112 during assembly. The outer wall 235 of the boss 131 abuts against the inner wall 136 of the groove 132, and there is a gap 445 between the outer wall 234 of the boss 131 and the inner wall 137 of the groove 132. That is, the distance between the two outer walls 234 and 235 of the boss 131 (i.e., the distance the boss 131 extends circumferentially along the bearing housing 442) is less than the distance between the two inner walls 136 and 137 of the groove 132 (i.e., the distance the groove 132 extends circumferentially along the bearing housing 442). When the first valve body 111 rotates, it applies torque to the bearing 112. However, because the outer wall 235 of the boss 131 abuts against the inner wall 136 of the groove 132, the bearing 112 cannot rotate relative to the bearing housing 442.

[0035] It is worth mentioning that it is very advantageous to have the distance that the protrusion 131 extends along the circumference of the bearing accommodation 442 smaller than the distance that the groove 132 extends along the circumference of the bearing accommodation 442, so that there is a gap 445 between them, because the gap 445 is advantageous for the dimensional tolerance necessary in manufacturing and assembly, and the existence of the gap 445 will not have any adverse effect on the valve 100.

[0036] It is worth noting that at the initial assembly, the gap 445 can be located between the outer side wall 235 of the protrusion 131 and the inner side wall 136 of the groove 132. Since the turning of the first valve body 111 is certain, this makes the bearing 112 have a tendency to turn along the turning direction of the first valve body 111. Under the action of the first valve body 111, since the inner side wall 136 of the groove 132 does not contact the outer side wall 235 of the protrusion 131, it cannot block the bearing 112 from slowly turning with the first valve body 111, so that the inner side wall 136 of the groove 132 gradually approaches the outer side wall 235 of the protrusion 131, and the gap between the outer side wall 235 of the protrusion 131 and the inner side wall 136 of the groove 132 gradually becomes smaller. Finally, when the inner side wall 136 of the groove 132 abuts against the outer side wall 235 of the protrusion 131, the bearing 112 cannot continue to turn due to the blocking effect of the protrusion 131, and reaches a stationary state. At this time, the gap 445 is no longer located between the outer side wall 235 of the protrusion 131 and the inner side wall 136 of the groove 132, but is located between the outer side wall 234 of the protrusion 131 and the inner side wall 137 of the groove 132.

[0037] Of course, those skilled in the art should know that in other embodiments, there can also be no gap 445, i.e. the outer side wall 234, 235 of the protrusion 131 respectively contacts the corresponding inner side wall 136, 137 of the groove 132. In addition, the height of the protrusion 131 does not need to strictly match the depth of the groove 132, it can be greater than or less than the depth of the groove 132, which will not have any adverse effect on the valve 100, and is advantageous for processing and manufacturing.

[0038] It should be noted that although the limiting portion 131 in the present application is a boss extending towards the bearing 112 perpendicularly to the shaft 121 of the first valve body 111, and the receiving portion 132 is a groove formed on the bearing 112, the skilled person in the art can understand that the limiting portion 131 and the receiving portion 132 can be other structures or shapes, as long as the limiting portion 131 and the receiving portion 132 can cooperate with each other to limit the movement of the bearing 112 relative to the bearing accommodating portion 442. For example, the limiting portion 131 can be a hook portion extending downwards first and then upwards relative to the curved surface 118, or a protruding portion extending obliquely relative to the shaft 121 of the first valve body 111; the receiving portion 132 can be an opening, such as a rectangular opening, on the sidewall of the bearing 112 matching the limiting portion 131, or any other structure capable of matching the corresponding limiting portion 131. In addition, the number of limiting portions 131 and receiving portions 132 is not limited to one as shown in the embodiment, and can be two, three, or even more.

[0039] The applicant has noticed that the valve in the prior art limits the bearing in the housing by interference fit of the bearing and the housing. The structure of the valve in the prior art is very strict in the manufacturing requirement of the parts, and the assembly process is complex, which is not conducive to mass production and control. Specifically, the valve is usually made of plastic. If the interference amount is too large during assembly, the bearing is likely to be difficult to assemble, or the housing will be deformed or even cracked; if the interference amount is too small, it is difficult to guarantee that the bearing is tightly fitted relative to the housing after installation, and relative movement and rotation do not occur. Moreover, the smaller the size of the valve is, the more difficult it is to control the interference amount of the bearing, which is not conducive to the miniaturization of the valve. Even if the interference amount is appropriate, after the valve is installed, after a long period of use, the creep of the bearing or the housing will cause the bearing to fall off from the housing, affecting the normal use of the valve.

[0040] The present application effectively overcomes the above-mentioned shortcomings of the prior art. The plastic parts of the present application will not or rarely be squeezed, so that the present application can overcome the problem that the plastic parts themselves are not pressure-resistant. The present application accommodates the bearing 112 by the outer side 117 of the wall portion 180 of the bracket 106 engaging the neck portion 104 to jointly form the bearing accommodating portion 442, and prevents the bearing 112 from falling off and rotating by providing the limiting portion 131 on the outer side 117 of the wall portion 180 of the bracket 106 and the receiving portion 132 on the bearing 112 that cooperates with the limiting portion 131. The present application will not have the situation that the bearing 112 falls off from the housing 101 due to creep during use, because there is no or only a small force between the bearing 112 and the housing 101. The present application is also conducive to the miniaturization of the valve 100, because the limiting portion 131 and the receiving portion 132 do not need to be configured in proportion to the size of the bearing 112, and are less affected by the size of the bearing 112 compared to the prior art. In addition, the valve 100 of the present application allows the existence of the gap 445 between the limiting portion 131 and the receiving portion 132, which greatly reduces the manufacturing difficulty of the parts and is conducive to mass production and control of the parts. Moreover, the assembly process of the valve 100 of the present application is also simpler than the prior art.

[0041] The assembly process of the valve 100 of the present application is as follows. In combination with Figure 1B and Figure 4 , first, the second valve body 113 is installed into the space surrounded by the base 160 and the inner side 116 of the wall portion 180 of the bracket 106, and the shaft 121 of the first valve body 111 is inserted into the corresponding shaft hole on the first housing portion 102. Then, the groove 132 of the bearing 112 is engaged with the boss 131 of the bracket 106, and the gear 115 is sleeved on the shaft 226 of the bracket 106. Then, the pre-assembled second valve body 113, bracket 106, gear 115 and bearing 112 are inserted into the housing 101 as a whole, so that the shaft hole of the bearing 112 is engaged with the shaft 121 of the first valve body 111, and the shaft 123 of the second valve body 113 and the shaft 226 of the bracket 106 are respectively engaged with the corresponding shaft holes on the second housing portion 103. Finally, the cover assembly 190 is closed to the lower end opening of the second housing portion 103, and the assembly of the valve 100 is completed.

[0042] Although the present application will be described with reference to the specific embodiments shown in the drawings, it should be understood that the valve of the present application can have many variations without departing from the spirit and scope of the teachings of the present application. Those skilled in the art will also realize that there are different ways to change the structural details in the embodiments disclosed by the present application, all of which fall within the spirit and scope of the present application and the claims.

Claims

1. A valve characterized by: The valve comprises: a housing comprising a first housing part, a second housing part, and a neck connecting the first housing part and the second housing part, a first valve body cavity being formed in the first housing part; a bracket disposed in the second housing part, the bracket and the second housing part jointly forming a second valve body cavity and a pump cavity, and the bracket and the neck jointly forming a bearing accommodating portion, wherein the bearing accommodating portion fluidly connects the first valve body cavity and the pump cavity; a first valve body rotatably disposed in the first valve body cavity; a bearing accommodated in the bearing accommodating portion, the bearing being configured to support a shaft of the first valve body; a second valve body rotatably disposed in the second valve body cavity, wherein a shaft of the second valve body is supported by the bracket; wherein a limiting portion is provided on a portion of the bracket that jointly forms the bearing accommodating portion with the neck, the limiting portion extends towards the bearing, the bearing has a receiving portion, and the limiting portion cooperates with the receiving portion to limit movement of the bearing relative to the bearing accommodating portion, the bracket comprises a base and a wall portion connected to the base, an outer side of the wall portion jointly forms the bearing accommodating portion with the neck, the bearing accommodating portion has a circular inner surface, an outer side of the wall portion of the bracket is provided with a circular arc surface, the circular arc surface jointly forms the circular inner surface of the bearing accommodating portion with an inner surface of the neck, wherein the limiting portion extends out from the circular arc surface, and wherein the limiting portion extends towards the bearing perpendicularly to the shaft of the first valve body.

2. The valve of claim 1, wherein: an inner side of the base and the wall portion jointly forms the second valve body cavity with the second housing part, and an outer side of the wall portion jointly forms the pump cavity with the second housing part.

3. The valve of claim 2, wherein: a diameter of the circular inner surface matches an outer diameter of the bearing.

4. The valve of claim 1, wherein: the limiting portion is a boss, and the receiving portion is a groove formed on the bearing, and the boss is inserted into the groove.

5. The valve of claim 4, wherein: the boss contacts a groove bottom of the groove.

6. The valve of claim 1, wherein: a distance along a circumferential direction of the bearing accommodating portion at which the limiting portion extends is less than a distance along the circumferential direction of the bearing accommodating portion at which the receiving portion extends.

7. The valve of claim 1, wherein: an opening is provided on the bearing to fluidly connect the first valve body cavity and the pump cavity.

8. The valve of claim 1, wherein: the limiting portion and the bracket are integrally formed by an injection molding process.

Images