To solve the problem, we need to understand the properties of arithmetic sequences and how they apply to the given sequences $\{a_{n}\}$ and $\{b_{n}\}$.

### Part 1: Finding $\frac{a_2+a_{20}}{b_7+b_{15}}$

Given that $\{a_{n}\}$ and $\{b_{n}\}$ are arithmetic sequences, we can use the property that the average of any two terms equidistant from the beginning and end of a finite arithmetic sequence is equal to the average of the first and last term. Therefore, we have:

$$\frac{a_2+a_{20}}{b_7+b_{15}} = \frac{a_1+a_{21}}{b_1+b_{21}}$$

Since the sum of the first $n$ terms of an arithmetic sequence is given by $S_n$ for $\{a_{n}\}$ and $T_n$ for $\{b_{n}\}$, we can express the sum of the first 21 terms as $2S_{21}$ for $\{a_{n}\}$ and $2T_{21}$ for $\{b_{n}\}$, because the sum of an arithmetic sequence can also be expressed as $n$ times the average of its first and last term. Therefore:

$$\frac{a_2+a_{20}}{b_7+b_{15}} = \frac{21(a_1+a_{21})}{21(b_1+b_{21})} = \frac{2S_{21}}{2T_{21}} = \frac{3\times21+1}{21+3} = \frac{64}{24} = \frac{8}{3}$$

Hence, $\boxed{\frac{8}{3}}$.

### Part 2: Finding the Number of Values of $n$ for Which $\frac{a_n}{b_n}$ is an Integer

To find when $\frac{a_n}{b_n}$ is an integer, we start by expressing $\frac{a_n}{b_n}$ in terms of the sums of the sequences:

$$\frac{a_n}{b_n} = \frac{2a_n}{2b_n} = \frac{a_1+a_{2n-1}}{b_1+b_{2n-1}} = \frac{(2n-1)(a_1+a_{2n-1})}{(2n-1)(b_1+b_{2n-1})} = \frac{2S_{2n-1}}{2T_{2n-1}} = \frac{3(2n-1)+1}{2n+2} = \frac{6n-2}{2n+2} = \frac{3n-1}{n+1}$$

Simplifying further, we get:

$$\frac{a_n}{b_n} = \frac{3(n+1)-4}{n+1} = 3-\frac{4}{n+1}$$

For $\frac{a_n}{b_n}$ to be an integer, the fraction $\frac{4}{n+1}$ must also be an integer. This implies that $n+1$ must be a divisor of $4$. Considering $n+1 \geqslant 2$, the possible values for $n+1$ are $2$ and $4$, leading to $n = 1$ and $n = 3$.

Therefore, the number of values of $n$ for which $\frac{a_n}{b_n}$ is an integer is $\boxed{2}$.