A mute throttle valve and a throttle valve assembly

Abstract

This invention relates to the field of throttling valve technology for air conditioning refrigeration, specifically disclosing a silent throttling valve and a throttling valve assembly. The silent throttling valve includes a valve seat, a valve core, and a retaining ring. The valve core includes a large-diameter section and a small-diameter section, with a connecting section between the two sections. The retaining ring has a guide hole adapted to the small-diameter section, and an inner conical hole at the end of the retaining ring facing the valve core. When the valve core is in its extreme position away from the valve hole within the valve core cavity, line contact is formed between the retaining ring and the valve core. The silent throttling valve with the above structure effectively reduces impact noise generated by axial movement, radial rotation, and axial misalignment of the valve core. Furthermore, the valve core is lighter, the valve seat is shorter, and the cost is lower.

Description

Technical Field

[0001] This invention relates to the field of throttling valve technology for air conditioning refrigeration, and specifically to a silent throttling valve and throttling valve assembly. Background Technology

[0002] After the air conditioner is turned off, the refrigerant flows from the high-pressure component to the low-pressure component due to pressure changes. When the refrigerant flows through the throttle valve, the throttle valve is in a non-throttling state, and the valve core is suspended in the valve seat. During the pressure balance process, the valve core will undergo axial movement within the valve seat.

[0003] In existing technology, the valve core is confined within the valve core cavity of the valve seat by a narrowing at the valve seat port to prevent it from detaching. In this type of throttle valve, the irregular contact between the valve core end and the narrowing of the valve seat causes the valve core to move axially to the irregular contact position, resulting in irregular impacts. Simultaneously, radial rotation also occurs, causing the valve core to impact the inner cavity of the valve seat. Both types of impacts generate significant noise. Furthermore, due to the gap between the outer wall of the valve core and the inner cavity of the valve seat, the valve core and valve seat are not always coaxial during the valve core's movement. The tilt of the valve core relative to the axis also causes impacts between the valve core and the inner cavity of the valve seat, generating noise.

[0004] Besides the situation after the air conditioner is turned off, some existing inverter air conditioners use two one-way throttle valve assemblies or one two-way throttle valve assembly simultaneously. When one one-way throttle valve is in a throttling state, the other one-way throttle valve is open. During low-frequency operation, due to the low refrigerant pressure in the system, when the refrigerant pressure is approximately equal to the weight of the valve core, the valve core in the open one-way throttle valve will also float at any position within the valve seat. During the pressure change and balance process, the valve core will experience axial movement, rotation, and axis tilting, which will also produce the three types of noise mentioned above.

[0005] Another type of inverter air conditioner uses only one one-way throttle valve assembly. When the air conditioner is in cooling mode, the throttle valve assembly is in the open state (non-throttle). When running at low frequency, due to the low refrigerant pressure in the system, when the refrigerant pressure is basically equal to the weight of the valve core, the valve core in the open throttle valve assembly will also be suspended in any position in the valve seat. During the pressure change and balance process, the valve core will experience axial movement, rotation, and axis tilting, which will also produce the three types of noise mentioned above.

[0006] With the advancement of silent air conditioning technology, the noise level of air conditioners needs further improvement. This application aims to improve the structure of the throttle valve to further reduce noise. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the technical defect of excessive noise in the throttle valve in the air conditioning field in the prior art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a silent throttle valve, comprising at least:

[0009] A valve seat, wherein a valve hole and a valve core cavity are provided inside the valve seat, the inner diameter of the valve core cavity is larger than the inner diameter of the valve hole, a transition cone surface is provided between the valve core cavity and the valve hole, and at least one liquid flow channel is provided in the circumferential direction near the transition cone surface of the valve core cavity.

[0010] The valve core is movably installed in the valve core cavity of the valve seat, and the end of the valve core facing the valve hole is provided with an arc surface for sealing with the transition cone surface in the throttling state;

[0011] It also includes a retaining ring, which is fixedly installed at the end of the valve core cavity away from the valve hole. The retaining ring has an inner conical hole on the side close to the valve core cavity and an axial guide hole on the side away from the valve core cavity. The inner conical hole communicates with the guide hole, and the diameter of the inner conical hole at its maximum diameter is not less than the inner diameter of the valve core cavity.

[0012] The valve core includes a large-diameter section near the valve hole and a small-diameter section near the retaining ring. A connecting section is provided between the large-diameter section and the small-diameter section. The outer diameter of the small-diameter section is adapted to the inner diameter of the guide hole. The gap between the small-diameter section and the guide hole is greater than the gap between the large-diameter section and the valve core cavity. When the valve core moves to the extreme position away from the valve hole in the valve core cavity, the position where the large-diameter section connects to the connecting section is in line contact with the inner conical surface of the inner conical hole.

[0013] In a preferred embodiment, the connecting section is provided with an outer conical surface, and the cone angle β of the outer conical surface is greater than the cone angle α of the inner conical hole.

[0014] In a preferred embodiment, the position where the outer conical surface connects to the large-diameter segment is provided with a rounded arc surface.

[0015] In a preferred embodiment, the connecting segment has a stepped surface, and the position where the maximum diameter of the stepped surface connects to the large-diameter segment has a rounded arc surface.

[0016] In a preferred embodiment, the valve core cavity is provided with a retaining ring mounting cavity at the end away from the valve hole, the bottom of the retaining ring mounting cavity is provided with a limiting step, and the end of the retaining ring facing the valve core is provided with a limiting surface adapted to the limiting step.

[0017] Compared with the prior art, the silent throttle valve based on the above structure has the following technical advantages:

[0018] (1) During the axial movement of the valve core, when it moves to the limit position of the non-throttling state, the position where the large diameter section and the connecting section are in line contact with the inner cone surface of the inner cone hole. Compared with the prior art, since it is a regular line contact and the impact surface is located on the inner cone surface, it does not directly impact the front. The impact force will generate axial and radial components, that is, the impact force is more dispersed and the noise generated by the impact is relatively smaller.

[0019] (2) In the prior art, the outer wall diameter of the valve core is basically the same. In this embodiment, the valve core includes a large diameter section and a small diameter section. During the process of the valve core changing from a throttling state to a non-throttling state, the small diameter section of the valve core first enters the guide hole of the retaining ring. During this process, due to the formation of two cooperation relationships between the small diameter section and the guide hole and the large diameter section and the valve core cavity, the two cooperation relationships restrict each other, reducing the amplitude of the valve core impacting the inner wall of the valve core cavity due to the relative axis offset, thereby reducing the impact noise caused by the valve core offset.

[0020] (3) Due to the mutual constraints between the small diameter section and the guide hole, and the large diameter section and the valve core cavity, the problem of valve core rotation during the movement of the valve core is also improved, thereby reducing the noise generated by the valve core rotating and impacting the valve body.

[0021] (4) In this embodiment, the impact between the outer wall of the valve core and the inner wall of the valve core cavity mainly occurs between the large diameter section and the valve core cavity. Compared with the prior art, the contact area between the valve core and the valve core cavity is significantly reduced. With the reduction of the contact area and the reduction of the contact length, the impact noise will also be smaller.

[0022] (5) In the prior art, the outer wall diameter of the valve core is basically the same and the valve core cannot be protruded from the valve seat. In this embodiment, the valve core includes a large diameter section and a small diameter section. The free end of the small diameter section can extend out of the retaining ring or even the valve seat in the non-throttling state. Thus, under the same valve core stroke, the length of the valve seat can be less than the length of the valve seat in the prior art. Therefore, when the length of the valve seat is shortened, the cost of the valve seat will inevitably be reduced.

[0023] Another embodiment of a silent throttle valve includes at least:

[0024] A valve seat, wherein a valve hole and a valve core cavity are provided inside the valve seat, the inner diameter of the valve core cavity is larger than the inner diameter of the valve hole, a transition cone surface is provided between the valve core cavity and the valve hole, and at least one liquid flow channel is provided in the circumferential direction near the transition cone surface of the valve core cavity.

[0025] The valve core is movably installed in the valve core cavity of the valve seat, and the end of the valve core facing the valve hole is provided with an arc surface for sealing with the transition cone surface in the throttling state;

[0026] It also includes a retaining ring, which is fixedly installed at the end of the valve core cavity away from the valve hole. The retaining ring has an inner conical hole on the side close to the valve core cavity and an axial guide hole on the side away from the valve core cavity. The inner conical hole communicates with the guide hole, and the diameter of the inner conical hole at its maximum diameter is not less than the inner diameter of the valve core cavity.

[0027] The valve core includes a large-diameter section near the valve hole and a small-diameter section near the retaining ring. A connecting section is provided between the large-diameter section and the small-diameter section. The connecting section has an outer conical surface, and the cone angle β of the outer conical surface is smaller than the cone angle α of the inner conical hole. The outer diameter of the small-diameter section is adapted to the inner diameter of the guide hole, and the gap between the small-diameter section and the guide hole is greater than the gap between the large-diameter section and the valve core cavity. When the valve core moves to its extreme position away from the valve hole within the valve core cavity, the position where the inner conical hole connects to the guide hole is in line contact with the outer conical surface of the connecting section.

[0028] In a preferred embodiment, the position where the inner conical hole connects to the guide hole is provided with an arc-shaped transition surface.

[0029] The silent throttle valve of this embodiment differs from the silent throttle valve of the aforementioned structure in that: the cone angle β of the outer conical surface of the connecting section is smaller than the cone angle α of the inner conical hole; causing the valve core to move to the extreme position away from the valve hole in the valve core cavity, the position where the inner conical hole connects to the guide hole is in line contact with the outer conical surface of the connecting section.

[0030] This difference results in the impact point being further away from the valve hole and alters the impact-bearing surface (in the aforementioned structure, the impact-bearing surface is the inner conical surface of the inner conical hole; in this embodiment, the impact-bearing surface is the outer conical surface of the connecting section). However, since the impact surface is also a conical surface, it has the effect of dispersing the impact force. Furthermore, the impact occurs as a regular, closed-loop line contact. Its noise reduction effect is comparable to that of the aforementioned embodiment. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the silent throttle valve in the non-throttle state according to Embodiment 1;

[0032] Figure 2 This is a schematic diagram of the silent throttle valve in the throttle state according to Embodiment 1;

[0033] Figure 3 This is a schematic diagram of the silent throttle valve in the explosion state of Example 1;

[0034] Figure 4 The silent throttle valve in Example 1 Figure 1 A schematic diagram showing the connection state between the valve core and the retaining ring in the indicated state;

[0035] Figure 5This is a schematic diagram of the retaining ring structure in the silent throttle valve of Embodiment 2;

[0036] Figure 6 This is a schematic diagram of the one-way throttle valve assembly in Embodiment 3;

[0037] Figure 7 This is a schematic diagram of the connection state between the valve core and the retaining ring in the throttling state of the silent throttling valve in Example 4;

[0038] Figure 8 This is a schematic diagram of the valve core structure in the silent throttle valve of Example 5;

[0039] Figure 9 This is a schematic diagram of the connection state between the valve core and the retaining ring in the throttling state of the silent throttling valve in Example 6;

[0040] Figure 10 for Figure 9 The diagram shows the explosion state of the valve core and retaining ring.

[0041] Figure 11 This is a schematic diagram of the bidirectional throttle valve assembly in Embodiment 7. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0043] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Example 1

[0046] One type of throttle valve in this embodiment, such as Figure 1-3As shown, the device includes a valve seat 10, a valve core 20, and a retaining ring 30. The valve seat 10 has a valve hole 12 that is interconnected with the valve core 20 and a valve core cavity 11 for mounting the valve core 20. The valve core 20 can move axially within the valve core cavity 11.

[0047] The inner diameter of the valve core cavity 11 is larger than the inner diameter of the valve hole 12, and a transition cone surface 13 is provided between the valve core cavity 11 and the valve hole 12.

[0048] In this embodiment, the cavity wall of the valve core cavity 11 is provided with two radially penetrating fluid flow channels 14 near the transition cone surface 13 along the circumferential direction. Of course, the number of fluid flow channels 14 can be one or more, preferably two.

[0049] In this embodiment, a retaining ring mounting cavity 15 is provided at the end of the valve core cavity 11 away from the valve hole 12, and a limiting step 16 is provided at the bottom of the retaining ring mounting cavity 15. The retaining ring 30 is installed in the retaining ring mounting cavity 15, and the end of the retaining ring 30 facing the valve core 20 has a limiting surface 33 that matches the limiting step 16. During installation, after the limiting surface 33 comes into contact with the limiting step 16, the retaining ring can be fixed to the valve seat by welding; alternatively, it can be... Figure 1-2 As shown, the port of the valve seat is shrunk and the retaining ring is riveted into the retaining ring mounting cavity 15.

[0050] In this embodiment, the valve core 20, as shown... Figure 1-3 As shown, the valve core 20 includes a large-diameter section 21 near the valve orifice and a small-diameter section 22 away from the valve orifice, with a connecting section between the large-diameter section and the small-diameter section. In this embodiment, the connecting section has an outer conical surface 23. The end of the valve core 20 facing the valve orifice 12 has an arc surface 25 for sealing with the transition conical surface 13 in a throttling state. Preferably, this arc surface is spherical. Preferably, an annular clearance groove 24 is provided on the outer wall of the large-diameter section of the valve core 20 near the valve orifice to ensure that the arc surface 25 and the transition conical surface 13 can completely contact and seal. In the state where the arc surface 25 and the transition conical surface 13 can completely contact and seal, i.e. Figure 2 As shown in the throttling state, due to the pressure of the refrigerant, the valve core and valve seat are tightly fitted, and the valve core will not wobble or produce noise.

[0051] In this embodiment, the retaining ring 30 is provided with a guide hole 31 that is adapted to the small diameter section 22, and an inner conical hole 32 is provided at the end facing the valve core 20.

[0052] In this embodiment, the gap between the small-diameter segment and the guide hole is greater than the gap between the large-diameter segment and the valve core cavity. Simultaneously, the diameter at the maximum diameter of the inner conical hole is not less than the inner diameter of the valve core cavity. This arrangement ensures that, during valve core movement, the small-diameter segment can smoothly enter the guide hole, while simultaneously ensuring that the impact point between the valve core and the retaining ring is at least within the inner conical hole.

[0053] Wherein, the cone angle β of the outer conical surface 23 is smaller than the cone angle α of the inner conical hole. For example... Figure 4 As shown, in the extreme position of the silent throttle valve in the non-throttle state, the small diameter section completely enters the guide hole, so that the position where the inner cone hole connects with the guide hole forms a line contact with the outer cone surface of the connecting section.

[0054] In this silent throttle valve structure, when the valve core is in its extreme position away from the valve hole within the valve core cavity, the free end of the small-diameter section can extend out of the guide hole of the retaining ring or even the valve seat. Thus, with a fixed valve core stroke, the length of the valve seat can be reduced, thereby saving production costs while meeting usage requirements.

[0055] In this embodiment, the length of the small-diameter segment of the valve core typically accounts for 1 / 10 to 1 / 2 of the total length of the valve core. In this embodiment, based on the angular variation of the cone angle β (at the extreme angle, the outer cone surface becomes a plane perpendicular to the axis), a suitable length is selected within the aforementioned range for the length of the small-diameter segment of the valve core, resulting in a more balanced range of cost, lifespan, and performance.

[0056] In addition, because the valve core includes a large-diameter section and a small-diameter section, the weight of the valve core is reduced, and its center of gravity shifts towards the large-diameter section end. This shift in the center of gravity also reduces the oscillation of the valve core, which contributes to the noise reduction of the throttle valve.

[0057] The retaining ring in this embodiment is usually made of stainless steel or copper, which are existing conventional materials, which helps to reduce costs and facilitate mass production.

[0058] Example 2

[0059] like Figure 5 As shown, the silent throttle valve of this embodiment differs from that of Embodiment 1 in that the position where the inner conical hole of the retaining ring connects to the guide hole is provided with an arc-shaped transition surface 34. The purpose of this design is that when the retaining ring collides with the outer conical surface on the valve core, the arc surface where the arc-shaped transition surface is located will cause less damage to the outer conical surface, which is beneficial to improving the service life of the silent throttle valve.

[0060] Example 3

[0061] like Figure 6As shown, a one-way throttle valve assembly of this embodiment includes a valve tube 40, a valve seat mounting cavity 41 is provided in the valve tube 40, and a silent throttle valve of embodiment one is installed in the valve seat mounting cavity 41. In addition, in this embodiment, a filter screen 42 is provided at both ends of the throttle valve in the valve tube.

[0062] Preferably, the filter screen 42 in this embodiment is made of stainless steel with a mesh size of 50 to 150.

[0063] It should be noted that this embodiment is a specific application of the silent throttle valve of Embodiment 1. The throttle valve assembly of this embodiment can be directly applied to air conditioners, with both ends connected to the refrigerant lines of the air conditioner. This throttle valve assembly also possesses the silent technology advantages of the silent throttle valve in Embodiment 1, thereby making the air conditioner using this throttle valve assembly even quieter.

[0064] Example 4

[0065] like Figure 7 As shown, the most significant difference between the silent throttle valve of this embodiment and that of Embodiment 1 is that the cone angle β of the outer cone surface 23 is greater than the cone angle α of the inner cone hole.

[0066] In this state, when the valve core moves to its limit position in the non-throttling state, a line contact is formed between the location where the large-diameter section connects to the connecting section and the inner conical surface of the inner conical hole. In this state, the inner conical surface disperses the impact force generated at the location where the large-diameter section connects to the connecting section, thereby reducing the impact force and impact noise.

[0067] Example 5

[0068] like Figure 8 As shown, the silent throttle valve in this embodiment differs from that in Embodiment 4 in that a rounded arc surface 27 is provided at the connection between the outer conical surface and the large-diameter section. With this configuration, when the valve core collides with the inner conical surface of the retaining ring, the rounded arc surface causes less damage to the inner conical surface, which helps to improve the lifespan of the silent throttle valve.

[0069] Example 6

[0070] In this embodiment, as Figure 9-10 As shown, the structure of the valve body and the retaining ring is the same as in Embodiment 5. The difference lies in the structure of the valve core. In this embodiment, the connecting section of the valve core is set as a stepped surface 23′, and the position where the maximum diameter of the stepped surface connects to the large diameter section is provided with a rounded arc surface 27.

[0071] like Figure 9 As shown, in the silent throttle valve of this embodiment, in the extreme position of the non-throttle state, the rounded arc surface 27 and the inner conical surface of the retaining ring form a line contact.

[0072] It should be noted that the silent throttle valves of Embodiments 2, 4, 5, and 6 can all be applied to the one-way throttle valve assembly of Embodiment 3.

[0073] Example 7

[0074] like Figure 11 As shown, a bidirectional throttle valve assembly of this embodiment includes a valve tube 40, which has a valve seat mounting cavity 41. Two silent throttle valves as shown in Embodiment 1 are installed in the valve seat mounting cavity 41, and the two silent throttle valves are installed in opposite directions.

[0075] In this embodiment, a filter screen 42 is provided inside the valve tube on the side of the silent throttle valve near the end of the valve tube. Preferably, the filter screen 42 in this embodiment is made of stainless steel and has a mesh size of 50 to 150.

[0076] It should be noted that this embodiment is a specific application of the silent throttling valve of Embodiment 1. The bidirectional throttling valve assembly of this embodiment can be directly applied to inverter air conditioners, with both ends connected to the refrigerant piping of the air conditioner. During use, one silent throttling valve in this bidirectional throttling valve assembly is always in a throttling state, while the other is in a conducting state. Therefore, the silent throttling valve in the conducting state provides the same level of quietness as the silent throttling valve in Embodiment 1, resulting in a quieter air conditioner using this bidirectional throttling valve assembly.

[0077] It should also be noted that the silent throttle valve used in the bidirectional throttle valve assembly of this embodiment can also be any of the silent throttle valves in embodiments two, four, five, and six.

[0078] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silent throttle valve, comprising at least: Valve seat (10), the valve seat is provided with a valve hole (12) and a valve core cavity (11) that are interconnected. The inner diameter of the valve core cavity is larger than the inner diameter of the valve hole. A transition cone surface (13) is provided between the valve core cavity and the valve hole. At least one liquid flow channel (14) that penetrates the valve core cavity wall radially is provided in the circumferential direction near the transition cone surface of the cavity wall. Valve core (20), the valve core is movably installed in the valve core cavity of the valve seat, and the end of the valve core facing the valve hole is provided with an arc surface (25) for sealing with the transition cone surface in the throttling state. The feature is that it further includes a retaining ring (30), which is fixedly installed at the end of the valve core cavity away from the valve hole. The retaining ring is provided with an inner conical hole (32) near the valve core cavity and an axial guide hole (31) away from the valve core cavity. The inner conical hole communicates with the guide hole, and the diameter of the inner conical hole at its maximum diameter is not less than the inner diameter of the valve core cavity. The valve core includes a large-diameter section (21) near the valve hole and a small-diameter section (22) near the retaining ring. A connecting section is provided between the large-diameter section and the small-diameter section. The outer diameter of the small-diameter section is adapted to the inner diameter of the guide hole. The gap between the small-diameter section and the guide hole is greater than the gap between the large-diameter section and the valve core cavity. When the valve core moves to the extreme position away from the valve hole in the valve core cavity, the position where the large-diameter section and the connecting section are connected forms a line contact with the inner conical surface of the inner conical hole. The free end of the small-diameter section extends out of the retaining ring in a non-throttling state; During the process of the valve core changing from a throttling state to a non-throttling state, the small-diameter section of the valve core first enters the guide hole of the retaining ring. In this process, two mating relationships are formed: the small-diameter section with the guide hole and the large-diameter section with the valve core cavity. These two mating relationships restrict each other.

2. The silent throttle valve according to claim 1, characterized in that, The connecting section is provided with an outer conical surface (23), and the cone angle β of the outer conical surface is greater than the cone angle α of the inner conical hole.

3. The silent throttle valve according to claim 2, characterized in that, The outer conical surface is provided with a rounded arc surface (27) at the position where it connects to the large diameter section.

4. The silent throttle valve according to claim 1, characterized in that, The connecting section is provided with a stepped surface (23′), and the position where the maximum diameter of the stepped surface connects with the large diameter section is provided with a rounded arc surface (27).

5. The silent throttle valve according to claim 1, characterized in that, The valve core cavity is provided with a retaining ring mounting cavity (15) at the end away from the valve hole. The bottom of the retaining ring mounting cavity is provided with a limiting step (16). The end of the retaining ring facing the valve core is provided with a limiting surface (33) that matches the limiting step.

6. A silent throttle valve, comprising at least: Valve seat (10), the valve seat is provided with a valve hole (12) and a valve core cavity (11) that are interconnected. The inner diameter of the valve core cavity is larger than the inner diameter of the valve hole. A transition cone surface (13) is provided between the valve core cavity and the valve hole. At least one liquid flow channel (14) that penetrates the valve core cavity wall radially is provided in the circumferential direction near the transition cone surface of the cavity wall. Valve core (20), the valve core is movably installed in the valve core cavity of the valve seat, and the end of the valve core facing the valve hole is provided with an arc surface (25) for sealing with the transition cone surface in the throttling state. The feature is that it further includes a retaining ring (30), which is fixedly installed at the end of the valve core cavity away from the valve hole. The retaining ring is provided with an inner conical hole (32) near the valve core cavity and an axial guide hole (31) away from the valve core cavity. The inner conical hole communicates with the guide hole, and the diameter of the inner conical hole at its maximum diameter is not less than the inner diameter of the valve core cavity. The valve core includes a large-diameter section (21) near the valve hole and a small-diameter section (22) near the retaining ring. A connecting section is provided between the large-diameter section and the small-diameter section. The connecting section has an outer conical surface (23). The cone angle β of the outer conical surface is smaller than the cone angle α of the inner conical hole. The outer diameter of the small-diameter section is adapted to the inner diameter of the guide hole. The gap between the small-diameter section and the guide hole is greater than the gap between the large-diameter section and the valve core cavity. When the valve core moves to the extreme position away from the valve hole in the valve core cavity, the position where the inner conical hole connects to the guide hole forms a line contact with the outer conical surface of the connecting section. The free end of the small-diameter section extends out of the retaining ring in a non-throttling state; During the process of the valve core changing from a throttling state to a non-throttling state, the small-diameter section of the valve core first enters the guide hole of the retaining ring. In this process, two mating relationships are formed: the small-diameter section with the guide hole and the large-diameter section with the valve core cavity. These two mating relationships restrict each other.

7. The silent throttle valve according to claim 6, characterized in that, An arc-shaped transition surface (34) is provided at the position where the inner conical hole connects to the guide hole.

8. The silent throttle valve according to any one of claims 1-7, characterized in that, The length of the small-diameter section accounts for 1 / 10 to 1 / 2 of the total length of the valve core.

9. A one-way throttle valve assembly, characterized in that, It includes at least a valve tube (40), a valve seat mounting cavity (41) is provided in the valve tube, a silent throttle valve as described in any one of claims 1-8 is provided in the valve seat mounting cavity, and a filter screen is provided at both ends of the silent throttle valve in the valve tube.

10. A bidirectional throttle valve assembly, characterized in that, It includes at least a valve tube (40), in which a valve seat mounting cavity (41) is provided, and two silent throttle valves as described in any one of claims 1-8 are installed in the valve seat mounting cavity. The two silent throttle valves are installed in opposite directions, and a filter screen is provided on the side of the silent throttle valve near the end of the valve tube.

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